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Process for producing rubber composition for tire tread

A technology of rubber composition and tire tread, which is applied in the field of manufacturing rubber composition for tire tread, and can solve the problems of poor accuracy of extruded product weight, reduced processability of extrusion process, and inability to improve silica supplementation. Improve the wear resistance, improve the processing performance and productivity

Inactive Publication Date: 2010-01-06
BRIDGESTONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, if the reaction between the silane coupling agent and the silica is insufficient, the reinforcement of the silica cannot be improved, resulting in poor wear resistance of the tire
Further, the unreacted silane coupling agent reacts in the subsequent extrusion process in the kneading process of the rubber composition, forming pores (a large number of cells or holes) in the extruded product of the rubber composition, so that extrusion molding The accuracy of the size and weight of the object will deteriorate, and the processability of the extrusion process will decrease.
[0006] For this problem, although by increasing the number of mixing steps in the mixing process, the silica and silane coupling agent in the mixing process can be completely reacted, but the productivity of the mixing process will be significantly reduced.

Method used

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  • Process for producing rubber composition for tire tread
  • Process for producing rubber composition for tire tread
  • Process for producing rubber composition for tire tread

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0102] The following examples are given to describe the present invention in more detail, but the present invention is not limited by the following examples.

[0103] In addition, processability and abrasion resistance in the extrusion process were evaluated by the following methods.

[0104] (1) Processability of extrusion process

[0105] When the kneaded rubber was extruded from the extruder, the generation of bubbles in the tread cross section was visually observed. Calculate the number of bubbles per unit area of ​​the test sample, and obtain an index by the following formula.

Embodiment 1～6 and comparative example 1

[0113] According to the formulations and mixing methods shown in Table 1, seven kinds of rubber compositions were mixed and prepared with a Banbury mixer. According to the usual method, the 7 kinds of rubber compositions were used for the cap rubber and the tread base, and 7 kinds of pneumatic tires with a tire size of 225 / 45R17 were tested to evaluate the processability and wear resistance of the extrusion process. The results are shown in Table 1.

[0114] [Table 1]

[0115] Table 1

[0116]

[0117] [Note]

[0118] * 1: Manufactured by JSR Co., Ltd., SBR trade name "#1712"

[0119] * 2: Manufactured by Asahi Kasei Co., Ltd., SBR trademark "Tufdene3335"

[0120] * 3: ISAF-HS, TOKAI CARBON CO., LTD., manufacture trademark "SEAST 7HM"

[0121] * 4: Manufactured by TOSOH SILICA CORPORATION, trademark "NipsilAQ"

[0122] * 5: Bis(3-triethoxysilylpropyl)tetrasulfide, a silane coupling agent manufactured by Degussa, trademark "Si69"

[0123] * 6: Bis(3-triethoxysilyl...

Embodiment 2、7～14 and comparative example 1

[0132] Next, according to the formulation and mixing method shown in Table 2, 10 types of rubber compositions were prepared by mixing with a Banbury mixer. According to the usual method, these 10 types of rubber compositions were used for both the crown top rubber and the tread base, and 10 types of pneumatic tires with a tire size of 225 / 45R17 were tested, and the processability and wear resistance of the extrusion process were evaluated. performance. The results are shown in Table 2.

[0133] [Table 2]

[0134] Table 2

[0135]

[0136] [Note]

[0137] * 1, * 2, * 3. * 4. * 5. * 10. * 13. * 14 and * 15 Same as Table 1.

[0138] * 11: Dimethyl stearamide

[0139] * 12: Sodium borate decahydrate (Na 2 B 4 o 7 10H 2 O)

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Abstract

A process for producing a rubber composition for tire treads which includes: a masterbatch kneading step in which 100 parts by mass of a rubber ingredient (A) comprising at least one of natural rubber and synthetic diene rubbers is kneaded together with 20-150 parts by mass of silica (B), 1-30 parts by mass of a silane coupling agent (C), and a compound (D) accelerating the reaction between the silica and the silane coupling agent; and a final kneading step in which the resultant masterbatch, a vulcanizing agent, and a vulcanization accelerator are kneaded. The rubber composition obtained by the process gives a tire having improved wearing resistance and is improved in processability and productivity in kneading steps and an extrusion step.

Description

technical field [0001] The present invention relates to a method for producing a rubber composition for tire treads, which improves the wear resistance of tires and greatly improves the operability of the tire tread component manufacturing process. Background technique [0002] In recent years, as people's attention to environmental problems has increased, carbon dioxide emissions have been restricted worldwide, and the demand for lower fuel consumption in automobiles has also increased. In order to meet such demands, it is also desired to reduce the rolling resistance of tires in terms of tire performance. Conventionally, as a method of reducing tire rolling resistance, a method of optimizing the tire structure has been studied, and the most common method at present is to use a rubber composition with low heat generation as a rubber composition suitable for the tire. [0003] As a method of obtaining such a rubber composition with low heat generation, a method of using sil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/22B60C1/00C08K3/36C08K3/38C08K5/16C08K5/54C08L7/00C08L9/00
CPCC08L9/00C08K5/548C08K3/36C08L7/00C08L2205/02B60C1/0016C08J2307/00C08J3/203C08L9/06C08K5/549C08J2309/00C08K5/5419C08L21/00C08L2666/08
Inventor 佐坂尚博
Owner BRIDGESTONE CORP
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