Silica-containing conjugated diene based rubber composition and formed article

A technology of rubber composition and conjugated diene, applied in the field of cross-linked molded parts, can solve the problems of low fuel consumption and insufficient gripping materials, and achieve the effect of low fuel consumption

Inactive Publication Date: 2007-01-17
ZEON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the rubber compositions obtained by these methods are not sufficient as materials for tire treads that require both low fuel consumption and grip properties at a higher level than conventional ones.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0168] First, in the first step, according to the mixing amount shown in Table 1, with respect to the SBR-silica mixture (A1) obtained in the preparation item of A1 above, the silane was mixed with an open rubber mixer at 50°C. Coupling agent (Si75: manufactured by Degutsusa Co., Ltd.), zinc white (particle size 0.4 μm, zinc white #1: manufactured by Honjo Chemical Co., Ltd.), stearic acid, and anti-aging agent (Nokraku 6C: manufactured by Ouchi Shinkyo Co., Ltd.) were mixed to obtain rubber Composition 1. In this step, the temperature of the rubber composition 1 becomes about 80° C., and heating is performed for about 4 minutes.

[0169] Next, in the second step, SBR (Nipol9521 (bound styrene amount: 45% Glass transition temperature: -28 DEG C, oil extension: 27.3%, Mooney viscosity: 50): Japanese ゼオン company manufactures) After masticating for 0.5 minutes, add carbon black (シ-スト 7HM by the mixing amount shown in Table 1 : manufactured by Tokai Ka-bon Co., Ltd.), zinc white...

Embodiment 2

[0199] First, in the first step, use a closed rubber mixer to masticate the SBR-silicon dioxide mixture (A2) obtained in the preparation item of the above-mentioned A2 in the amount shown in Table 3 after 0.5 minutes of mastication, according to Table 3 Add silane coupling agent (Si69: manufactured by Degussa Co., Ltd.), zinc white (Zinc white #1), stearic acid, and anti-aging agent (Nocluck 6C) in the indicated mixing amount, and knead for 4.5 minutes to obtain rubber composition 6 . The temperature at the end of kneading was 150°C. In this step, the rubber composition 6 is heated at a temperature of about 110° C. to 150° C. for about 4 minutes.

[0200] Then, in the second step, using a closed rubber mixer, the solution polymerization end-modified SBR (Nipol NS-116R (Nipol NS-116R) (combined styrene content: 21%, butadiene monomer unit part Vinyl binding amount: 63%, glass transition temperature: -25°C, Mooney viscosity: 45): manufactured by Japan's ゼオン company) After mast...

Embodiment 3

[0224] First, in the first step, use a closed rubber mixer to masticate the SBR-silicon dioxide mixture (A3) obtained in the preparation item of the above-mentioned A3 in the amount shown in Table 5 after 0.5 minutes of mastication, according to Table 5 Add silane coupling agent (Si69), carbon black (シ-スト 7HM), paraffin oil, zinc white, stearic acid, paraffin powder, anti-aging agent (Nokrac 6C) to the mixing amount shown, and knead for 4.5 minutes. Rubber composition 11 was obtained. The temperature at the end of kneading was 145°C.

[0225] Then, in the second step, using a closed rubber mixer, after masticating the rubber composition 11 with the mixing amount shown in Table 5 for 0.5 minutes, add the polybutadiene rubber (high cis BR: Nipol BR1220N (cis-binding amount: 97%, glass transition temperature: -110° C., Mooney viscosity: 43, 5% by weight toluene solution viscosity: 96 cps., manufactured by Nippon Zeon Co., Ltd.) and kneaded for 3.5 minutes. The discharge tempera...

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Abstract

A silica-containing conjugated diene based rubber composition which is prepared by co-coagulating an aqueous dispersion or a solution of a conjugated diene based rubber (a) having a glass transition temperature of -120 to 0 DEG C and an aqueous dispersion of silica, so as to form a conjugated diene based rubber-silica mixture (A) containing 30 wt % or more of a component insoluble in toluene, and then compounding the above mixture with a conjugated diene based rubber (b) having a glass transition temperature being different from that of the above conjugated diene based rubber (a) by an absolute value of 3 to 100 DEG C. The above rubber composition can be suitably used for producing a tire tread which offers a balance in high degree of low fuel consumption, wet grip characteristics, mechanical strength, abrasion resistance and low temperature impact resistance.

Description

technical field [0001] This invention relates to novel silica-containing rubber compositions, and more particularly to rubber compositions suitable for use as tire treads and crosslinked moldings of the rubber compositions. Background technique [0002] Rubber compositions used as tire treads are required to satisfy various contradictory properties such as low fuel consumption, grip, mechanical strength, abrasion resistance, and low-temperature embrittlement resistance. It is therefore difficult to balance these properties using a single type of rubber in a rubber composition, and therefore a plurality of diene rubbers are generally used in combination. [0003] In addition, a method of improving the above-mentioned characteristics by controlling the dispersion of carbon black conventionally used as a filler in rubber compositions for tires when combining a plurality of diene rubbers has also been attempted. For example, Patent Document 1 discloses that, in a rubber composi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L21/00C08K3/36C08J3/215
CPCC08J3/215C08K3/36C08L2205/02C08J2321/00C08L21/00C08L9/00C08L9/06C08L2666/08
Inventor 唐渡毅千野吉宏渡边一孝谷田部修
Owner ZEON CORP
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