WO2003002648A1 - Bande de roulement pour pneumatique renforcee d'une silice a basse surface specifique - Google Patents
Bande de roulement pour pneumatique renforcee d'une silice a basse surface specifique Download PDFInfo
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- WO2003002648A1 WO2003002648A1 PCT/EP2002/006885 EP0206885W WO03002648A1 WO 2003002648 A1 WO2003002648 A1 WO 2003002648A1 EP 0206885 W EP0206885 W EP 0206885W WO 03002648 A1 WO03002648 A1 WO 03002648A1
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- elastomer
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
- C08K3/36—Silica
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
- B60C1/0016—Compositions of the tread
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/16—Solid spheres
- C08K7/18—Solid spheres inorganic
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
- C08K9/12—Adsorbed ingredients, e.g. ingredients on carriers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
- C08L9/06—Copolymers with styrene
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/86—Optimisation of rolling resistance, e.g. weight reduction
Definitions
- the present invention relates to tire treads, more particularly to treads reinforced with an inorganic filler, more specifically silica, and to tires comprising such treads.
- the tire treads must, in a known manner, obey numerous technical requirements, often contradictory, in the first place having a high resistance to wear or abrasion and a high grip, while offering the tire a very good level of road behavior. (“hcmdling") on a motor vehicle, requiring in particular a high drift thrust or "cornering".
- carbon black exhibits such aptitudes, which is generally not the case for inorganic fillers, in particular silicas. Indeed, for reasons of reciprocal affinities, these particles of inorganic charge have an unfortunate tendency, in the elastomeric matrix, to agglomerate between them. These interactions have the harmful consequence of limiting the dispersion of the filler and therefore the reinforcing properties to a level substantially lower than that which would theoretically be possible to achieve if all the bonds (inorganic filler / elastomer) capable of being created. during the operation of
- a coupling agent also called bonding agent, which has the function of ensuring the connection or bonding between the surface of the particles (silanol groups Si-OH) of silica and the elastomer , while facilitating the dispersion of this charge within the elastomeric matrix, the high specific surface recommended for these silicas being precisely intended to increase the number and quality of the connections between the silica and the coupling agent, in order to reach the top expected level of reinforcement.
- Such coupling agents are well known to those skilled in the art, essentially polyfunctional organosilanes or polysiloxanes.
- the best known are polysulphurized alkoxysilanes, in particular bis- (alkoxylsilylalkyl) polysulphides such as bis- (alkoxylsilylpropyl) polysulphides, in particular bis 3-triethoxysiiylpropyl tetrasulphide and disulphide (in short TESPT and TESPD, respectively) generally considered like the products providing, for treads loaded with silica, the best compromise in terms of safety in roasting, ease of implementation and reinforcing power. As such, they are the coupling agents most used today in "Green Tires".
- Increased cooking times are in particular detrimental to the treads intended for retreading, whether it is "cold” retreading (use of a precooked tread) or more conventional "hot” retreading (use of a tread in the raw state); in the latter case, an extended cooking time, in addition to the fact that it increases the production costs, leads in known manner to overcooking (postcooking) of the rest of the casing ("carcass") of the used tire (already vulcanized), which may affect certain performances of the latter.
- a first subject of the invention relates to a tire tread incorporating an elastomeric composition reinforced with an inorganic filler, based on at least:
- a diene elastomer (i) a diene elastomer; (ii) as reinforcing inorganic filler, more than 80 phr of a silica having the following characteristics:
- a vulcanization system comprising sulfur, a primary vulcanization accelerator and, as vulcanization activator, between 0.5 and 1.5 phr of zinc.
- the invention also relates to the use of a tread according to the invention for the manufacture or retreading of tires, as well as these tires themselves when they comprise a tread according to the invention .
- the tires of the invention are particularly intended for equipping vehicles capable of traveling at high speed in a sustained manner such as passenger vehicles, 4x4 vehicles (4-wheel drive), SUV (Sport Utility Vehicles), two wheels (in particular motorcycles) , vans, "Heavy goods vehicles” (notably metro, bus, road transport equipment such as trucks, tractors, trailers).
- the treads according to the invention can be prepared by a process constituting another object of the present invention.
- This improved process for preparing a tire vulcanizable with sulfur, with performance compromise (wear resistance / rolling resistance / adhesion), based on diene elastomer, a reinforcing inorganic filler and a vulcanization system includes the following stages:
- a possible alternative to the above process also in accordance with the invention, consists in incorporating all or part of the quantity of zinc, not during the non-productive phase but during the productive phase, at the same time as sulfur and primary accelerator.
- the silicas described below consist, in a known manner, of agglomerates of particles, capable of disaggregating into these particles under the effect of an external force, for example under the action of mechanical work or ultrasound.
- particle used in the present application must be understood in its usual generic sense of aggregate (also called “secondary particle”), and not in that of elementary particle (also called “primary particle”) which may form, the if applicable, part of this aggregate; "aggregate” means in a known manner the non-breaking set (ie, which cannot be cut, divided, shared) which is produced during the synthesis of the charge, generally formed of elementary (primary) particles aggregated between they.
- the BET specific surface area (“mass area”) is determined by gas adsorption using the Brunauer-Emmett-Teller method described in "The Journal of the American Chemical Society” Vol. 60, page 309, February 1938), more precisely according to the French standard NF ISO 9277 of December 1996 [multi-point volumetric method (5 points) - gas: nitrogen - degassing: hour at 160 ° C - relative pressure range p / in: 0.05 to 0.17].
- CTAB specific surface is the external surface determined according to French standard NF T 45-007 of November 1987 (method B).
- the average size (by mass) of the particles is measured in a conventional manner after dispersion, by ultrasonic deagglomeration, of the charge to be analyzed in water.
- the measurement is carried out using a centrifugal sedimentometer with X-ray detection type "XDC"("X-rays Disk Centrifuge”), sold by the company Brookhaven Instruments, according to the following operating mode.
- the deagglomeration speed noted ⁇ is measured by means of an ultrasonic deagglomeration test, at 100% power of a 600 W (watt) probe, operating here in pulsed mode (i.e.: 1 second ON, 1 second OFF ) to avoid excessive heating of the ultrasound probe during the measurement.
- This known test which is in particular the subject of patent application WO99 / 28376 (see also WO99 / 28380, WO00 / 73372, WOOO / 73373), makes it possible to continuously measure the change in the average size (in volume) of particle agglomerates during sonication, as indicated below.
- the assembly used consists of a laser granulometer (type "Mastersizer S”, sold by Malvern Instruments - He-Ne laser source emitting in the red, wavelength 632.8 nm) and its preparer ("Malvern Small Sample Unit MSX1 "), between which was inserted a continuous flow treatment cell (Bioblock M72410) fitted with an ultrasonic probe (1/2 inch sonicator type Vibracell of 600 W sold by the company Bioblock).
- a small amount (150 mg) of silica to be analyzed is introduced into the preparer with 160 ml of water, the circulation speed being fixed at its maximum. At least three consecutive measurements are made to determine according to the known Fraunhofer calculation method (Malvern calculation matrix 3 $$ D) the initial mean diameter (by volume) of the agglomerates, denoted d v [0].
- the sonication (pulsed mode: 1 s ON, 1 s OFF) is then established at a power of 100% o (ie 100% of the maximum position of the "tip amplitude") and the evolution of the diameter is followed for 8 minutes approximately.
- volume average d v [t] as a function of time "t" at the rate of a measurement every 10 seconds approximately.
- the aforementioned application WO99 / 28376 describes in detail a measuring device which can be used for carrying out this ultrasonic deagglomeration test.
- This device consists in a closed circuit in which a flow of agglomerates of particles suspended in a liquid can flow.
- This device essentially comprises a sample preparer, a laser granulometer and a processing cell. A setting at atmospheric pressure, at the level of the sample preparer and of the processing cell itself, allows the continuous elimination of air bubbles which form during sonication (action of the ultrasonic probe).
- the sample preparer (“Malvern Small Sample Unit MSX1”) is intended to receive the silica sample to be tested (suspended in liquid 3) and to circulate it through the circuit at the preset speed (potentiometer - speed maximum of about 3 1 / min), in the form of a flow of liquid suspension.
- This preparer simply consists of a receiving tank which contains, and through which circulates, the suspension to be analyzed.
- a centrifugal mini-pump is intended to ensure the circulation of the suspension in the circuit;
- the inlet of the preparer is connected to the open air via an opening intended to receive the load sample to be tested and / or the liquid used for the suspension.
- the preparer is connected to a laser granulometer ("Mastersizer S") whose function is to continuously measure, at regular time intervals, the volume average size "d v " of the agglomerates, as the flow passes, thanks to a measurement to which the automatic recording and calculating means of the granulometer are coupled.
- Mastersizer S a laser granulometer
- laser granulometers exploit, in a known manner, the principle of diffraction of light by solid objects suspended in a medium whose refractive index is different from that of the solid. According to Fraunhofer's theory, there is a relationship between the size of the object and the angle of diffraction of light (the smaller the object, the larger the angle of diffraction).
- a processing cell Interposed between the preparer and the laser granulometer is finally a processing cell equipped with an ultrasonic probe, which can operate in continuous or pulsed mode, intended to continuously break up the agglomerates of particles as the flow passes.
- This flow is thermostatically controlled by means of a cooling circuit arranged, at the level of the cell, in a double envelope surrounding the probe, the temperature being controlled for example by a temperature probe immersed in the liquid at the level of the preparer.
- the rubber compositions are characterized, before and after curing, as indicated below. -
- the measurements are carried out at 130 ° C, in accordance with French standard NF T 43-005 (1991).
- the evolution of the consistometric index as a function of time makes it possible to determine the toasting time of the rubber compositions, assessed in accordance with the aforementioned standard by parameter T5 (in the case of a large rotor), expressed in minutes, and defined as being the time necessary to obtain an increase in the consistometric index (expressed in MU) of 5 units above the minimum value measured for this index.
- the measurements are carried out at 150 ° C. with an oscillating chamber rheometer, according to standard DIN 53529 - part 3 (June 1983).
- the evolution of the rheometric torque as a function of time describes the evolution of the stiffening of the composition as a result of the vulcanization reaction.
- the measurements are processed according to DIN 53529 - part 2 (March 1983): tj is the induction time, that is to say the time necessary for the start of. the vulcanization reaction; t ⁇ (for example t 90 or t 99 ) is the time necessary to reach a conversion of ⁇ %, i.e. ⁇ % (for example 90% or 99%>, respectively) of the difference between the minimum and maximum couples.
- the conversion speed constant denoted K (expressed in min "1 ), of order 1, calculated between 30% and 80% of conversion, is also measured, which makes it possible to assess the vulcanization kinetics.
- a processing of the traction records also makes it possible to plot the module curve as a function of the elongation (see attached figure), the module used here being the true secant module measured in first elongation, calculated by reducing to the real section of the 'test tube and not in the initial section as previously for the nominal modules.
- the dynamic properties ⁇ G * and tan max ( ⁇ ) are measured on a viscoanalyzer (Metravib VA4000), according to standard ASTM D 5992-96.
- the response of a sample of vulcanized composition (4 mm thick cylindrical test piece and 400 mm 2 section) is recorded, subjected to a sinusoidal stress in alternating single shear, at the frequency of 10 Hz, under normal conditions of temperature (23 ° C) according to ASTM D 1349-99, or as the case may be at a different temperature.
- a deformation amplitude sweep is carried out from 0.1 to 50% - (outward cycle), then from 50% to 1% (return cycle).
- the Shore A hardness of the compositions after curing is assessed in accordance with standard ASTM D 2240-86.
- the level of elastomer which is not extractable with toluene is measured, after swelling for 15 days of a sample of rubber composition (typically 300-350 mg) in this solvent (for example in 80-100 cm 3 toluene), followed by a 24 hour drying step at 100 ° C, under vacuum, before weighing the rubber composition sample thus treated.
- a sample of rubber composition typically 300-350 mg
- this solvent for example in 80-100 cm 3 toluene
- the above swelling step is carried out at room temperature (about 20 ° C) and protected from light, and the solvent (toluene) is changed once, for example after the first five days swelling.
- the rate of “bound rubber” (% by weight), noted “BR”, is calculated in a known manner by difference between the initial weight and the final weight of the sample of rubber composition, after taking into account and elimination, in the calculation, of the fraction of components insoluble by nature, other than the elastomer, present initially in the rubber composition.
- Rolling resistance is measured on a steering wheel, according to ISO 87-67 (1992). A value greater than that of the control, arbitrarily set to 100, indicates an improved result, that is to say a lower rolling resistance.
- the tires are subjected to actual rolling on the road, on a specific motor vehicle, until the wear due to rolling reaches the wear indicators arranged in the grooves of the tread.
- the tires are mounted on a motor vehicle equipped with an ABS braking system and the distance required to go from 100 km / h to 0 km / h is measured during brutal braking on dry ground (bituminous concrete). A value greater than that of the control, arbitrarily fixed at 100, indicates an improved result, that is to say a shorter braking distance.
- the tires are mounted on a motor vehicle equipped with an ABS braking system and the distance required to go from 50 km / h to 10 km / h is measured during brutal braking on watered ground (bituminous concrete).
- the professional driver of the vehicle also gives a global, subjective rating of the road behavior of the vehicle - and therefore of the tires - on this watered virgin circuit; a score higher than that of the witness, arbitrarily set at 100, indicates improved overall behavior.
- Each tire tested is mounted on a wheel of suitable size and inflated to 2.2 bars. It is made to run at a constant speed of 80 km / h on an appropriate automatic machine (“ground-plane” type machine sold by the company MTS).
- the load denoted “Z” is varied, under a drift angle of 1 degree, and the stiffness or drift thrust denoted “D” (corrected for zero drift thrust) is measured in a known manner, by recording at using sensors the transverse force on the wheel as a function of this load Z.
- the drift thrust indicated in the tables is the slope at the origin of the curve D (Z). An increase in drift thrust is favorable to road behavior on dry ground.
- the tire treads according to the invention are therefore formed, in whole or in part, of a rubber composition based on at least:
- reinforcing inorganic filler more than 80 phr of a silica as described in detail below (having characteristics a and b);
- a coupling agent ensuring the connection between the reinforcing inorganic filler and the diene elastomer;
- a vulcanization system comprising sulfur, a primary vulcanization accelerator and, as vulcanization activator, between 0.5 and 1.5 phr of zinc.
- composition based on
- a composition comprising the mixture and / or the in situ reaction product of the various constituents used, some of these base constituents being capable of, or intended to react between them, at least in part, during the different manufacturing phases of the treads and tires, in particular during their vulcanization.
- diene elastomer or rubber
- elastomer an elastomer derived. at least in part (ie, a homopolymer or a copolymer) of diene monomers, that is to say of monomers carrying two carbon-carbon double bonds, conjugated or not.
- essentially unsaturated diene elastomer is meant here a diene elastomer derived at least in part from conjugated diene monomers, having a proportion of units or units of diene origin (conjugated dienes) which is greater than 15% (% by moles) .
- the expression “highly unsaturated” diene elastomer is understood in particular to mean a diene elastomer having a content of units of diene origin (conjugated dienes) which is greater than 50%.
- 1,3-butadiene, 2-meth ' yl-l, 3-butadiene, 2,3-di-alkyl (C ⁇ -C 5 ) -l, 3-butadienes such as by for example, 2,3-dimethyl-1,3-butadiene, 2,3-diethyl-1,3-butadiene, 2-methyl-3-ethyl-1,3-butadiene, 2-methyl-3-. isopropyl-1,3-butadiene, aryl-1,3-butadiene, 1,3-pentadiene, 2,4-hexadiene.
- Suitable vinyl-aromatic compounds are, for example, styrene, ortho-, meta-, para-methylstyrene, the commercial "vinyl-toluene" mixture, para-tertiobutylstyrene, methoxystyrenes, chlorostyrenes, vinyl mesitylene, divinylbenzene. , vinylnaphthalene.
- the copolymers can contain between 99% and 20% by weight of diene units and between 1% and 80%) by weight of vinyl-aromatic units.
- the elastomers can have any microstructure which is a function of the polymerization conditions used, in particular the presence or absence of a modifying and / or randomizing agent and the quantities of modifying and / or randomizing agent used.
- the elastomers can for example be block, statistical, sequence, microsequenced, and be prepared in dispersion or in solution; they can be coupled and / or stars or functionalized with a coupling and / or star-forming or functionalizing agent.
- the diene elastomer of the tread according to the invention is preferably made, in whole or in part, more preferably at a rate of at least 50 phr, by a highly unsaturated elastomer of the butadiene type, that is to say say chosen from the group of highly unsaturated diene elastomers constituted by polybutadienes (BR), butadiene copolymers and mixtures of these elastomers.
- BR polybutadienes
- butadiene copolymers are in particular butadiene-styrene copolymers (SBR), isoprene-butadiene copolymers (BIR), isoprene-butadiene-styrene copolymers (SBIR).
- BRs having a content of -1.2 units between 4% and 80%) or those having a cis-1,4 content greater than 80% o SBRs having a styrene content between 5% and 50% by weight and more particularly between 20%> and 40%, a content of -1,2 bonds of the butadiene part between 4% and 65%, a content of trans-1 bonds , 4 between 20%) and 80%>, the BIRs having an isoprene content between 5% and 90%> by weight and a glass transition temperature (("Tg" measured according to standard ASTM D3418-82) of - 40 ° C. to -80 ° C.
- Tg glass transition temperature
- SBIR copolymers in particular those having a styrene content of between 5%> and 50%) by weight and more particularly of between 10%> and 40%, an isoprene content between 15% and 60% by weight and more particularly between 20%) and 50%, a butadiene content between 5% and 50%> by weight and more particularly between 20%> and 40%>, a content of units -1,2 of the butadiene part between 4%> and 85%, a content of trans units -1.4 of the butadiene part between 6% and 80%, a content of units -1.2 plus -3.4 of the isoprene part between 5% and 70% and a content of trans units -1 , 4 of the isoprene part comprised between 10% and 50%>, and more generally any SBIR having a Tg comprised between -20 ° C. and -70 ° C.
- the butadiene elastomer is particularly chosen from BR, SBR and mixtures of these elastomers.
- the butadiene elastomer is mainly an SBR elastomer, whether it is an SBR prepared in emulsion ("ESBR") or an SBR prepared in solution (“SSBR”), or a mixture of SBR and another diene elastomer, in particular butadiene, for example a blend of SBR and BR, of SBR and NR (natural rubber), of SBR and IR (synthetic polyisoprene).
- ESBR SBR prepared in emulsion
- SSBR SBR prepared in solution
- butadiene for example a blend of SBR and BR, of SBR and NR (natural rubber), of SBR and IR (synthetic polyisoprene).
- an SBR having a styrene content of between 20% and 30%> by weight, a content of vinyl bonds of the butadiene part of between 15%) and 65%, a content of trans-1,4 bonds between 15%> and 75% o and a Tg between -20 ° C and -55 ° C.
- SBR copolymer preferably an SSBR, is optionally used in admixture with BR preferably having more than 90%) of cis-1,4 bonds.
- compositions of the treads of the invention may contain a single diene elastomer or a mixture of several diene elastomers, the diene elastomer or elastomers being able to be used in combination with any type of synthetic elastomer other than diene, or even with other polymers than elastomers, for example thermoplastic polymers.
- the essential characteristic of the tread according to the invention is that it is reinforced, as an inorganic filler, by more than 80 phr of a specific silica having the following characteristics:
- This specific silica firstly has an unusual BET surface for a tire tread application.
- BET value greater than 130 m 2 / g, in particular greater than 150 m / g
- the LS silicas have a BET surface area of not less than 50 m 2 / g.
- the rubber compositions certainly exhibit easier processing as well as reduced hysteresis, but there is the risk of loss of breaking properties, with resistance to wear and tear in the tread, which can be unacceptably reduced.
- the BET surface area is greater than 70 m 2 / g, more preferably still within a range of 100 to 125 m 2 / g .
- LS silicas must also have a size d w of between 30 and 300 nm.
- d w size of a size of d w of between 30 and 300 nm.
- d w size of a size of d w , greater than 300 nm.
- the particles behave like defects which localize the stresses and are detrimental to wear; sizes d w that are too small, less than 30 nm, on the other hand penalize the processing in the raw state and the dispersion of the silica during this processing.
- the LS silicas used will also preferably have a high intrinsic dispersibility, illustrated by a disaggregation speed ⁇ greater than 5.10 " 3 ⁇ nrVmin (measured in the ultrasonic deagglomeration described in previous chapter I.) For such a deagglomeration speed, it was found that the LS silica exhibited a very high dispersibility, that is to say that few micron agglomerates are observed by reflection under optical microscopy on a section of rubber composition prepared according to the rules of the art.
- the selected LS silicas preferably verify at least one of the following characteristics:
- a BET surface in a range of 100 to 125 m 2 / g; a particle size d w within a range of 100 to 150 nm; a disagglomeration speed ⁇ greater than 1.10 " 2 ⁇ m'Vmin.
- the physical state under which LS silica may appear is indifferent, whether in the form of powder, microbeads, granules, pellets, beads or any other densified form; it can be a precipitated silica such as a pyrolysis silica. Its BET / CTAB surface ratio is preferably within a range from 1.0 to 1.5, more preferably from 1.0 to 1.2.
- LS silicas can advantageously constitute all of the reinforcing inorganic filler, which constitutes the best known embodiment of the invention.
- silica LS could possibly be associated with another reinforcing inorganic filler, for example a small amount of a conventional reinforcing silica with a higher specific surface.
- reinforcing inorganic filler should be understood here any inorganic or mineral filler, whatever its color and its origin (natural or synthetic), also called “white” filler or sometimes “clear” filler as opposed to carbon black , capable of reinforcing on its own, without other means than an intermediate coupling agent, a rubber composition intended for the manufacture of a tire tread, in other words capable of replacing, in its reinforcement function , a conventional pneumatic grade carbon black (for tread).
- a reinforcing filler of the organic type could be used, in particular a carbon black, covered at least in part with an inorganic layer (for example, a layer of silica), requiring as for the use of a coupling agent to ensure the bond with the elastomer.
- an inorganic layer for example, a layer of silica
- Silica LS can also be associated with a conventional carbon black of pneumatic grade, chosen in particular from blacks of the HAF, ISAF, SAF type conventionally used in tire treads (for example, blacks NI 15, N134, N234, N330, N339, N347, N375).
- This carbon black is then preferably used in small proportion, at a rate preferably between 2 and 20 phr, more preferably in a range of 5 to 15 phr.
- the coloring properties (black pigmentation agent) and anti-UV properties of the carbon blacks are benefited, without, moreover, penalizing the typical performances provided by LS silica.
- the LS silica content is greater than 90 phr, more preferably between 90 and 150 phr, the optimum being of course different depending on the type of tire targeted.
- the LS silica content preferably represents more than 80%>, more preferentially more than 90% by weight of the total reinforcing agent (total inorganic filler plus carbon black, if applicable).
- coupling agent inorganic filler / elastomer
- organic filler / elastomer an agent capable of establishing a sufficient bond, of chemical and / or physical nature, between the inorganic filler and the diene elastomer .
- a coupling agent at least bifunctional, has for example as simplified general formula "Y-T-X", in which:
- Y represents a functional group (“Y” function) which is capable of physically and / or chemically binding to the inorganic charge, such a bond being able to be established, for example, between a silicon atom of the coupling agent and the surface hydroxyl groups (OH) of the inorganic filler (for example surface silanols when it is silica);
- X represents a functional group ("X" function) capable of binding physically and / or chemically to the diene elastomer, for example via a sulfur atom;
- T represents a divalent organic group making it possible to connect Y and X.
- the coupling agents should not be confused with simple agents for recovering the inorganic charge which, in known manner, may include the "Y" function active with respect to the inorganic charge but are devoid of the "X” function active with respect to the diene elastomer.
- Coupling agents (silica / diene elastomer), of variable effectiveness, have been described in a very large number of documents and are well known to those skilled in the art. Any known coupling agent can be used capable of effectively ensuring, in diene rubber compositions which can be used for the manufacture of tire treads, the connection between a reinforcing inorganic filler such as silica and a diene elastomer, in particular organosilanes or polyfunctional polyorganosiloxanes carrying the functions X and Y above.
- - n is an integer from 2 to 8 (preferably from 2 to 5);
- - A is a divalent hydrocarbon radical (preferably Ci alkylene groups -C 8 arylene groups or C 6 -C [2, especially alkylenes C ⁇ - Cio, in particular C ⁇ -C 4 in particular propylene );
- the radicals R 1 substituted or unsubstituted, identical or different from each other, represent a Ci-Cis alkyl, C 5 -C ⁇ 8 cycloalkyl or C 6 -C 18 aryl group (of preferably Cj-C 6 alkyl, cyclohexyl or phenyl groups, especially C ⁇ -C 4 alkyl groups, more particularly methyl and / or ethyl).
- radicals R 2 substituted or unsubstituted, identical or different, represent a hydroxyl, alkoxyl or Cj-C 18 cycloalkoxy, C 5 -C 18 (preferably a group selected from hydroxyl, alkoxyl -C 8 and C 5 -C 8 cycloalkoxyls, more preferably still a group chosen from hydroxyl and C 1 -C 4 alkoxyls, in particular methoxyl and ethoxyl).
- n is a fractional number, preferably included in a range of 2 to
- polysulphide silanes By way of examples of polysulphide silanes, mention will be made more particularly of the polysulphides (in particular disulphides, trisulphides or tetrasulphides) of bis- (alkoxyl (C ⁇ -C 4 ) -alkyl (C ⁇ -C) silyl-alkyl (C ⁇ -C 4 ) ), such as for example bis (3-trimethoxysilylpropyl) or bis (3-triethoxysilylpropyl) polysulfides.
- polysulphides in particular disulphides, trisulphides or tetrasulphides
- bis-3-trimethoxysilylpropyl or bis (3-triethoxysilylpropyl
- TESPT bis (3-tri-ethoxysilylpropyl) tetrasulfide
- TESPD bis (3-tri-ethoxysilylpropyl) tetrasulfide
- TESPD bis disulfide - (triethoxysilylpropyle)
- the TESPD is marketed for example by the company Degussa under the name Si75 (in the form of a mixture of disulfide - at 75% by weight - and polysulfides), or also by the company Witco under the name Silquest Al 589.
- TESPT is marketed for example by the company Degussa under the name Si69 (or X50S when supported at 50%) by weight on carbon black), or also by the company Osi Specialties under the name Silquest Al 289 (in both case, commercial mixture of polysulphides with an average value for n which is close to 4).
- the use of LS silica, in the treads according to the invention makes it possible to significantly reduce the level of coupling agent, in particular of polysulphurized silane, compared to the usual levels. practiced in the presence of a conventional silica with a higher specific surface.
- the level of coupling agent, in particular of polysulphurized silane is preferably less than 6 phr, more preferably between 2 and 6 phr.
- this rate of coupling agent is advantageously less than 8%, more preferably less than 6% by weight relative to the weight of reinforcing inorganic filler.
- the coupling agent used could be grafted beforehand (via the "X" function) onto the diene elastomer of the composition of the invention, the elastomer thus functionalized or “precoupled” then comprising the free "Y" function for the reinforcing inorganic filler.
- the coupling agent could also be grafted beforehand (via the "Y” function) onto the reinforcing inorganic filler, the filler thus “precoupled” can then be linked to the diene elastomer via the free "X” functions.
- the coupling agent can optionally be combined with an appropriate “coupling activator”, that is to say a body (single compound or combination of compounds) which, mixed with this coupling agent, increases the efficiency of the latter (see for example applications WO00 / 5300 and WO00 / 5301 above).
- an appropriate “coupling activator” that is to say a body (single compound or combination of compounds) which, mixed with this coupling agent, increases the efficiency of the latter (see for example applications WO00 / 5300 and WO00 / 5301 above).
- the basic vulcanization system consists of sulfur and a primary vulcanization accelerator, preferably a sulfenamide accelerator.
- a primary vulcanization accelerator preferably a sulfenamide accelerator.
- various known secondary accelerators or activators of vulcanization are added, incorporated during the first non-productive phase and / or during the productive phase.
- vulcanization activator As vulcanization activator is used a very small amount of zinc, between 0.50 and 1.5 phr, more preferably in a range of 0.7 to 1.3 phr.
- This specific quantity of zinc can be added to the rubber composition in any manner known to those skilled in the art, preferably in the form of zinc oxide, in this case therefore used at an equivalent preferential rate of between 0.6 and 1.9 pce, more preferably within a range of 0.9 to 1.6 pce.
- this zinc oxide is preferably associated a fatty acid, more preferably stearic acid, present at a preferential rate of 0.5 to 3 phr, more preferably of 1 to 3 phr.
- All or part of the zinc used can also be incorporated into the treads and their compositions in the form of a zinc salt of fatty acid, in particular in the form of zinc stearate, or of another active zinc donor compound. with regard to vulcanization.
- the primary vulcanization accelerator is preferably an accelerator of the sulfenamide type.
- the use of LS silica makes it possible to substantially reduce the overall level of sulfur and of sulfenamide accelerator to a preferential value of between 1.25 and 2.75 phr, more preferably comprised in a range of -1.5 to 2, 5 phr, sulfur and sulfenamide accelerator are also each used, even more preferably, at a rate of between 0.5 and 1.5 phr.
- a guanidine derivative is preferably used, in particular diphenylguanidine (DPG), incorporated during the first non-productive phase (preferential mode of the invention) and / or during the productive phase.
- DPG diphenylguanidine
- This guanidine derivative also plays the advantageous role of agent for covering silica LS.
- LS silica again makes it possible to advantageously reduce the overall level of sulfur, sulfenamide and guanidine derivative to a preferential value within a range of 1.75 to 4.25, more . preferably in a range of 2 to 4 pce.
- the elastomeric compositions of the treads according to the invention also comprise all or part of the usual additives used in rubber compositions intended for the manufacture of tire treads, such as for example extension oils, plasticizers, protective agents such as anti-ozone waxes, chemical anti-ozonants, antioxidants, anti-fatigue agents, coupling activators, reinforcing resins, methylene acceptors and / or donors.
- Silica LS can also be associated, if necessary, with a conventional white filler that is not very reinforcing or not, for example particles of clay, bentonite, talc, chalk, kaolin, which can be used, for example, in colored tire treads.
- the elastomeric compositions can also contain, in addition to the coupling agents described above, covering agents for inorganic fillers, comprising for example the only function Y, or more generally agents for assisting in the implementation, capable in known manner, by improving the dispersion of the reinforcing inorganic filler in the rubber matrix and by lowering the viscosity of the compositions, improving their ability to be used in the raw state;
- these agents used at a preferential rate of between 0.5 and 3 phr, are for example alkylalkoxysilanes, in particular alkyltriethoxysilanes, such as -1-octyl-triethoxysilane sold by the company Degussa-H ⁇ ls under the name Dynasylan Octeo or 1 - hexa-decyl-triethoxysilane sold by the company Degussa-Huls under the name Si216, polyols, polyethers (for example polyethylene glycols), primary,
- thermo-mechanical kneading sometimes called a "non-productive" phase
- T max a maximum temperature of between 110 ° C and 190 ° C, preferably between 130 ° C and 180 ° C
- second phase of mechanical work sometimes qualified as a "productive" phase
- the process for manufacturing the compositions according to the invention is characterized in that at least the LS silica (associated or not with another reinforcing inorganic filler or with a carbon black) and the coupling agent are intimately incorporated, by kneading, with the diene elastomer during the first so-called non-productive phase, that is to say that is introduced into the mixer and that is kneaded thermomechanically, in one or more times, at least these various basic constituents until a maximum temperature of between 110 ° C. and 190 ° C. is reached, preferably between 130 ° C. and 180 ° C.
- the first (non-productive) phase is carried out in a single thermomechanical step during which all the necessary basic components are introduced into a suitable mixer such as a conventional internal mixer. (diene elastomer, reinforcing inorganic filler and coupling agent), then in a second step, for example after one to two minutes of kneading, any additional covering or processing agents and other various additives, with the exception of basic vulcanization system consisting of sulfur and primary vulcanization accelerator; the apparent density of LS silica being generally low, it may be advantageous to split its introduction into two or more parts.
- a suitable mixer such as a conventional internal mixer.
- thermomechanical work can be added to this internal mixer, after the mixture has fallen and intermediate cooling (cooling temperature preferably less than 100 ° C.), with the aim of subjecting the compositions to a complementary thermomechanical treatment , in particular to further improve the dispersion, in the elastomeric matrix, of the reinforcing inorganic filler and of its coupling agent.
- the total duration of the kneading, in this non-productive phase is preferably between 2 and 10 minutes.
- sulfur and primary accelerator preferably sulfenamide
- an external mixer such as a cylinder mixer
- the whole is then mixed (productive phase) for a few minutes, for example between 5 and 15 minutes.
- the final composition thus obtained is then calendered, for example in the form of plates (thickness of 2 to 3 mm) or of thin sheets of rubber for the measurement of its physical or mechanical properties, in particular for a characterization in the laboratory, or even extradited to form rubber profiles used directly, after cutting or assembling to the desired dimensions, as tire treads.
- the method for preparing a tire tread according to the invention comprises the following steps:
- a possible alternative to the above process also in accordance with the invention, consists in incorporating all or part of the quantity of zinc, not during the first non-productive phase but during the second productive phase, at the same time. time as sulfur and primary accelerator.
- the vulcanization or curing of the tread or of the tire is carried out in a known manner at a temperature preferably between 130 ° C. and 200 ° C., preferably under pressure, for a sufficient time which can vary for example between 5 and 90 min depending in particular on the baking temperature, the vulcanization system adopted, the vulcanization kinetics of the composition considered and the size of the tire.
- the rubber compositions described above, based on LS silica generally constitute the entire tread according to the invention.
- the invention also applies to cases where these rubber compositions form only part of a tread of the composite type, consisting for example of transversely different adjacent bands, or else of two radially superposed layers of different constitutions, the part loaded with silica LS which can constitute, for example, in the second case, the radially external layer of the tread intended to come into contact with the ground from the start of rolling of the new tire, or on the contrary its radially internal layer intended to come into contact with the ground later.
- the characteristics of the fillers used in the following examples are summarized in Table 1.
- the filler denoted A is a conventional reinforcing silica with high specific surface (BET of about 160 m 2 / g), inorganic reference filler for reinforcement "Green Tires” treads ("Zeosil 1165MP" from Rhodia); the filler B is the silica LS with a lower specific surface. Both are precipitated silicas, in the form of microbeads, their BET / CTAB ratio is close to 1.
- the BET surface characteristics and size d w clearly differentiate the two charges, the charge B having a surface per unit of mass very significantly reduced (108 instead of 160 m 2 / g) and a particle size d w close to 50%) higher (125 nm instead of 85 nm).
- the two silicas are furthermore both characterized by a high intrinsic dispersibility, illustrated by a very high deagglomeration speed ⁇ , of the order of 1.25.10 "2 ⁇ m ' Vmin.
- a diene elastomer (or mixture of diene elastomers) is introduced into an internal mixer, filled to 70% and whose initial tank temperature is approximately 60 ° C. , if applicable), the reinforcing filler, the coupling agent, then, after one to two minutes of mixing, the various other ingredients with the exception of sulfur and the primary sulfenamide accelerator.
- Thermomechanical work (non-productive phase) is then carried out in one or two stages (total mixing time equal to approximately 7 min), until a maximum "fall" temperature of approximately 160-165 ° C. is reached.
- compositions are then either calendered in the form of plates (thickness of 2 to 3 mm) for the measurement of their physical or mechanical properties, or directly extruded in the form of tire treads.
- the silica used advantageously constitutes all of the reinforcing inorganic filler, associated with a low level of carbon black (less than 10 phr).
- This test is to demonstrate the overall improved performance of an elastomeric composition based on LS silica, compared to a control composition using a conventional silica (high specific surface) for a "Green Tire” tread.
- composition C-1 control: silica A (80 phr) with the usual level of ZnO (2.5 phr);
- composition C-2 control: silica B (94 phr) with the usual level of ZnO (2.5 phr);
- Composition C-3 invention: silica B (94 phr) with reduced rate of ZnO (1.25 phr).
- the butadiene elastomer consists of an SSBR comprising 25%> of styrene, 58%> of polybutadiene units 1-2 and 23% of polybutadiene units 1-4 trans, with which is associated a BR having more than 90%> of bonds cis-1,4.
- the rate of total reinforcing filler consisting of silica LS and a small amount of carbon black (less than 10 phr), is greater than 100 phr in the composition according to the invention.
- Composition C-3 intended for the tread according to the invention is characterized on the one hand by a very high level of LS silica (increased by almost 20%) compared to the control composition Cl), on the other hand part by a markedly reduced level of ZnO (halved compared to the control compositions Cl and C-2).
- composition C-3 compared with the reference solution C-1, also has the following advantageous characteristics:
- TESPT polysulphurized alkoxysilane
- a weight ratio of this same coupling agent, relative to the weight of silica significantly reduced (less than 6% compared to 8%>);
- an overall rate of sulfur and sulfenamide accelerator also significantly reduced (2.5 pce instead of 3 pce), as is the overall rate of sulfur, sulfenamide accelerator and guanidine derivative (3.95 pce instead of 4.5 pce) .
- the compositions based on silica LS show first of all (see Table 3): a viscosity in the raw state, admittedly equivalent, but much lower than that which would be observed for the control composition with isotals (94 pce) of conventional silica with high specific surface (in the latter case, more than 120 MU for the control solution Cl) , which illustrates an excellent capacity for processing in the raw state; - an equivalent rate of "bound rubber" (BR), which already indicates a very good bond between the silica LS and the coupling agent; reinforcement properties after curing which, unexpectedly, are at least equal to those of the control solution: equivalent Shore hardness, modules under strong deformation (MA100, MA300) and MA300 / MA100 ratio at least as high, as many indicators clear of a high quality of the reinforcement provided by the silica LS, the appended figure confirming well the above results with, for elongations from 100%) to 300%, an equivalent module for the three types of compositions; equivalent hyster
- compositions Cl and C-3 are used in this test as treads for passenger car tires with radial carcass, of size 195/65 RI 5 (speed index H), conventionally manufactured and in all points identical except for the rubber composition constituting the tread: composition Cl for the "Green Tires” witnesses (denoted Pl), composition C-3 for the tires of the invention (denoted P-3).
- the tires were first tested on a machine to determine their rolling resistance and their drift thrust, then mounted on the vehicle for further testing.
- the wear resistance of the tread is directly correlated to the level of reinforcement provided by the reinforcing inorganic filler and its associated coupling agent.
- the measurement of wear resistance is an excellent indicator, if not the best since evaluated on the final manufactured product, of the overall performance of the silica used.
- the tires according to the invention show a performance identical to that of the control tire, which already constitutes a remarkable and unexpected result for those skilled in the art: a reinforcing silica with a lower specific surface, provided that it is used at a very high rate in the tread, can therefore lead to a compromise (rolling resistance / wear resistance) equivalent to that which was hitherto believed to be available only with silica with more - high specific surface, typically greater than 150 m 2 / g.
- drift thrust an indicator for those skilled in the art of road behavior on dry ground, is also maintained at the same level.
- braking on dry or wet ground: the tires to be tested are mounted at the front of the vehicle; - driving on a virage wet circuit: the tires to be tested are fitted at the front and rear of the vehicle.
- the P-3 tires of the invention therefore show a compromise (rolling resistance / wear resistance / grip / behavior) which is generally improved compared to the reference constituted by the "Green Tires" P-1 witnesses.
- the previously described LS silicas have, thanks to their reduced specific surface, many advantages: less parasitic interactions, on the one hand between the silica particles themselves (reduced risk of re-agglomeration in the rubber matrix), on the other hand between the silica particles and the other rubber additives; overall improvement of the dispersibility in the diene matrix, during the mixing operations, that is to say of the use of the compositions in the raw state; possible reduction in the levels of coupling agent and vulcanizing agents, in particular of sulfur and of sulfenamide accelerator, which leads to a reduction in the costs of the formulation.
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN028167015A CN1547601B (zh) | 2001-06-28 | 2002-06-21 | 采用具有低比表面积的二氧化硅增强的轮胎胎面 |
JP2003509022A JP4536374B2 (ja) | 2001-06-28 | 2002-06-21 | 低い比表面積のシリカで強化されたタイヤトレッド |
DE60236090T DE60236090D1 (de) | 2001-06-28 | 2002-06-21 | Iedriger spezifischer oberfläche |
AT02740742T ATE465208T1 (de) | 2001-06-28 | 2002-06-21 | Reifenlauffläche verstärkt durch kieselsäure mit niedriger spezifischer oberfläche |
EP02740742A EP1419195B1 (fr) | 2001-06-28 | 2002-06-21 | Bande de roulement pour pneumatique renforcee d'une silice a basse surface specifique |
US10/745,649 US7300970B2 (en) | 2001-06-28 | 2003-12-29 | Tire tread reinforced with a silica of low specific surface area |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0108784 | 2001-06-28 | ||
FR01/08784 | 2001-06-28 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/745,649 Continuation US7300970B2 (en) | 2001-06-28 | 2003-12-29 | Tire tread reinforced with a silica of low specific surface area |
Publications (1)
Publication Number | Publication Date |
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WO2003002648A1 true WO2003002648A1 (fr) | 2003-01-09 |
Family
ID=8865048
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2002/006885 WO2003002648A1 (fr) | 2001-06-28 | 2002-06-21 | Bande de roulement pour pneumatique renforcee d'une silice a basse surface specifique |
Country Status (7)
Country | Link |
---|---|
US (1) | US7300970B2 (fr) |
EP (1) | EP1419195B1 (fr) |
JP (1) | JP4536374B2 (fr) |
CN (1) | CN1547601B (fr) |
AT (1) | ATE465208T1 (fr) |
DE (1) | DE60236090D1 (fr) |
WO (1) | WO2003002648A1 (fr) |
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Also Published As
Publication number | Publication date |
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ATE465208T1 (de) | 2010-05-15 |
DE60236090D1 (de) | 2010-06-02 |
EP1419195A1 (fr) | 2004-05-19 |
EP1419195B1 (fr) | 2010-04-21 |
JP2004530783A (ja) | 2004-10-07 |
CN1547601A (zh) | 2004-11-17 |
CN1547601B (zh) | 2012-09-05 |
JP4536374B2 (ja) | 2010-09-01 |
US7300970B2 (en) | 2007-11-27 |
US20050016651A1 (en) | 2005-01-27 |
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