Rubber composition and tyre using said composition

A technology of rubber composition and mixture, which is applied in the field of manufacturing tires, can solve the problems of increasing tire cost and price, increasing heat accumulation, and prolonging the service life of carcass reinforcements.

Inactive Publication Date: 2012-04-18
MICHELIN & CO CIE GEN DES ESTAB MICHELIN +1
35 Cites 12 Cited by

AI-Extracted Technical Summary

Problems solved by technology

However, this increase in weight leads to an increase in the cost price of the tire and to an increase in the heat build-up of the compounds used in the tire when the tire is running...
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Abstract

The present invention relates to a rubber composition made of at least one diene elastomer, a reinforcing filler, and a cross-linking system, characterised in that said composition comprises at least 10 to 150 pce of a lamellar filler and 0.01 to 0.3 pce of a metal salt. Said composition has good processability and mechanical properties, as well as improved properties of imperviousness to oxygen across a wide range of temperatures, from ambient temperatures when the tyre is stopped until temperatures of the tyre while running. According to a preferred embodiment of the invention, the previously described rubber composition can be used in the tyre as a protective elastomer layer in at least one portion of the tyre.

Application Domain

Special tyresPneumatic tyre reinforcements +1

Technology Topic

Protection layerElastomer +4

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  • Rubber composition and tyre using said composition
  • Rubber composition and tyre using said composition
  • Rubber composition and tyre using said composition

Examples

  • Experimental program(3)

Example Embodiment

[0178] III.1- Preparation of composition
[0179] The following test was carried out in the following manner: the diene elastomer, reinforcing filler (silica and/or carbon black), coupling agent (the presence of two) were continuously introduced into the internal mixer (final filling rate: about 70% by volume) Silicon oxide), 10 to 150 phr of flaky filler and 0.01 to 0.3 phr of metal salt and various other ingredients except the vulcanization system. The initial container temperature of the internal mixer is about 60°C. Thermomechanical processing (non-production phase) is then carried out in the first stage, which lasts a total of about 3 to 4 minutes, until the maximum "dripping" temperature of 165°C is reached.
[0180] The mixture thus obtained is taken out and cooled, then sulfur and sulfenamide type accelerators are introduced into the mixer (homogeneous dresser) at 30°C, and the combined mixture is mixed (production stage) for a suitable time (for example, 5 to 12 Between minutes).
[0181] Next, the composition thus obtained is calendered into the form of a flat plate (with a thickness of 2 to 3 mm) or a thin rubber sheet to measure their physical or mechanical properties, or it is extruded in the form of a layer to manufacture a tire.
[0182] III.2- Test

Example Embodiment

[0183] Example 1: Rubber composition with flake filler and metal salt
[0184] The purpose of this test is to show the improvement in the resistance to oxygen permeation of the three tire elastomer protective layer compositions according to the present invention compared with the control composition.
[0185] To this end, four rubber compositions were prepared as shown above, three of which were in accordance with the present invention (hereinafter denoted as C1.2, C1.3 and C1.4), while the control composition contained only iron acetylacetonate but not Flaky filler (hereinafter referred to as C1.1).
[0186] The four compositions contained natural rubber and iron acetylacetonate. The composition according to the present invention also includes flake filler, graphite with a particle diameter of the order of 20 microns (composition C1.2) or graphite with a particle diameter of about 3 microns (composition C1.3) or kaolin (composition C1 .4) and the high T of composition C1.2 and C1.3 g The hydrocarbon-based plasticized resin.
[0187] The composition with or without plasticizing resin according to the present invention exhibits better processability (lower Mooney viscosity) than the control composition C1.1 in an uncured state.
[0188] Compared to the control composition C1.1, the rheological properties of the compositions C1.2 to C1.4 did not change significantly.
[0189] After curing, it was observed that the MA10 modulus of the compositions C1.2, C1.3 and C1.4 according to the present invention and the MA10 modulus of the control composition C1.1 were the same overall.
[0190] Compared with the permeability of the control composition C1.1, finally, in summary, it is noted that the compositions C1.2, C1.3 containing metal salt and graphite and kaolin as flake fillers according to the present invention And C1.4 show much lower permeability.
[0191] In addition, this decrease in permeability of the mixture is more for the compositions C1.2 and C1.3, which also contain high T g The hydrocarbon-based plasticized resin.

Example Embodiment

[0192] Example 2: With flaky filler, metal salt and "high T g "Elastomer rubber composition
[0193] The purpose of this test is to show the improvement in the resistance to oxygen permeation of the three tire elastomer protective layer compositions according to the present invention compared with the control composition.
[0194] To this end, six rubber compositions are prepared as shown above, five of which are compositions according to the present invention (hereinafter referred to as C2.2, C2.3, C2.4, C2.5 and C2.6), One is a control composition (hereinafter referred to as C2.1). With respect to compositions C1.2 to C1.4, the composition according to the present invention additionally contains "high T g "Diene elastomer, the "high T g The diene elastomer of "" is a styrene-butadiene copolymer for compositions C2.3 to C2.6, and is epoxidized natural rubber for composition C2.2.
[0195] The composition according to the present invention shows better processability (lower Mooney viscosity) than the control composition C2.1 in the uncured state.
[0196] Compared to the control composition C2.1, the rheological properties of the compositions C2.4 to C2.6 were not significantly affected. The rheological properties of compositions C2.2 and C2.3 make it possible to use in tires.
[0197] After curing, it was observed that the MA10 modulus of the compositions C2.2 to C2.6 according to the present invention was equal to the MA10 modulus of the control composition C2.1 as a whole.
[0198] In summary, according to the present invention, the metal salt, flake filler and high T g Compositions C2.2 to C2.6 of the elastomer exhibited much lower permeability than the control composition C2.1, and also far lower than compositions C1.2 to C1.4.
[0199] However, this decrease in permeability of the composition is more for the compositions C2.2 and C2.3 containing the flaky filler of the montmorillonite type.
[0200] Table 1
[0201] Composition number
[0202] (1) Natural rubber;
[0203] (2) Carbon black: N683;
[0204] (3) Iron acetylacetonate: Fe(Acac) from CPAS 3;
[0205] (4) Graphite 1: Natural graphite "TIMREX GB 99/6" from Imerys;
[0206] (5) Graphite 2: Natural graphite "TIMREX GA 95/75" from Imerys;
[0207] (6) Natural kaolin "Kerbrient SP20" from Imerys;
[0208] (7) C5 fraction hydrocarbon-based resin "Hikorez A1100" from Kolon;
[0209] (8) Stearic acid: "Pristerene" from Uniquema;
[0210] (9) Zinc oxide (industrial grade-Umicore);
[0211] (10) Sulfur;
[0212] (11) N-cyclohexane-2-benzothiazole sulfenamide (Santocure CBS from Flexsys);
[0213] (12) N-1,3-Dimethylbutyl-N-phenyl-p-phenylenediamine (Santoflex 6-PPD from Flexsys).
[0214] Table 2
[0215]
[0216] table 3
[0217]
[0218] Table 4
[0219] Composition number
[0220] (1) Natural rubber;
[0221] (2) Carbon black: N683;
[0222] (3) Epoxidized natural rubber: "ENR-25" (Guthrie Polymer);
[0223] (4) SBR copolymer solution; 24% 1,2-vinyl, 41% styrene, 50% trans-1,4-butadiene, 26% cis-1,4-butadiene; (T g =-25℃);
[0224] (5) Iron acetylacetonate: Fe(Acac) from CPAS 3;
[0225] (6) Montmorillonite: "Cloisite 20A" from Southern Clay;
[0226] (7) Graphite 1: "TIMREX GB 99/6" from Imerys;
[0227] (8) Graphite 2: Natural graphite "TIMREX GA 95/75" from Imerys;
[0228] (9) Natural kaolin "Kerbrient SP20;" from Imerys
[0229] (10) C5 fraction hydrocarbon-based resin "HikorezA1100" from Kolon;
[0230] (11) Stearic acid: "Pristerene" from Uniquema;
[0231] (12) Zinc oxide (industrial grade-Umicore);
[0232] (13) Sulfur;
[0233] (14) N-cyclohexane-2-benzothiazole sulfenamide (Santocure CBS from Flexsys);
[0234] (15) N-1.3-Dimethylbutyl-N-phenyl-p-phenylenediamine (Santoflex 6-PPD from Flexsys).
[0235] table 5
[0236]
[0237] Table 6
[0238]

PUM

PropertyMeasurementUnit
Thickness2.0 ~ 3.0mm

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