Rubber composition and pneumatic tire

A rubber composition and rubber technology, applied in special tires, tire parts, transportation and packaging, etc., can solve the problems of poor dispersion of silica, tire wear resistance, and decrease in breaking strength, and achieve wet skid resistance excellent effect

Active Publication Date: 2012-02-08
株式会社引能仕材料
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when silica is used, the compounding amount of carbon black inevitably decreases, so there are problems such as a decrease in tire wear resistance and breaking strength.
In addition, the dispersibility of silica is poor, and the workability during kneading is also a big problem in the actual production of tires.

Method used

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  • Rubber composition and pneumatic tire
  • Rubber composition and pneumatic tire
  • Rubber composition and pneumatic tire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0202]Hereinafter, the present invention will be specifically described based on examples, but the present invention is not limited by these examples. In addition, "part" and "%" in an Example and a comparative example are a mass standard unless otherwise indicated. In addition, the measurement methods of various physical property values ​​and the evaluation methods of various characteristics are as follows.

[0203] [Vinyl Bond Content (%) and Bonded Styrene Content (%)]: Use 1 H-NMR (270MHz) measurement and calculation.

[0204] [cis-1,4-bond content (%) and 1,2-vinyl bond content (%)]: Calculated by the infrared method (Morero method).

[0205] [Glass transition temperature (° C.)]: measured based on ASTM D3418.

[0206] [Molecular weight distribution (Mw / Mn)]: Using GPC with the trade name "HLC-8120" (manufactured by TOSOH Corporation) and using a differential refractometer as a detector, the weight average molecular weight (Mw) and The number average molecular weight ...

Synthetic example 1

[0215] 2500 g of cyclohexane, 25 g of tetrahydrofuran, 100 g of styrene, and 390 g of 1,3-butadiene were charged into a nitrogen-substituted autoclave reactor with an internal volume of 5 L. After adjusting the temperature of the contents of the reactor to 20° C., 375 mg of n-butyllithium was added to initiate polymerization. Polymerization under adiabatic conditions, the highest temperature reached 85 ℃. When the polymerization conversion rate reached 99%, 10 g of butadiene was added, and after further polymerization for 5 minutes, 1043 mg of methyltriethoxysilane was added as a modifier and reacted for 15 minutes. After the polymerization reaction was completed, 2,6-di-tert-butyl-p-cresol was added. Next, solvent removal was carried out by steam extraction, and drying was carried out with a heated roll adjusted to 110° C. to obtain a modified styrene-butadiene copolymer (SBR-A). The vinyl bond content of the obtained SBR-A is 55%, the bonded styrene content is 20%, the gla...

Synthetic example 2～5、7～10

[0217] Except using the formula shown in Table 1, modified styrene-butadiene copolymers (SBR-B, SBR-C, SBR-D, SBR-E, SBR -G, SBR-H, SBR-I, SBR-J). The vinyl bond content, bonded styrene content, glass transition temperature, Mooney viscosity (ML 1+4 , 100° C.) and weight average molecular weight (Mw) are shown in Table 1 and Table 2.

[0218] [Table 1]

[0219]

[0220] [Table 2]

[0221]

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Abstract

A rubber composition from which a vulcanized rubber suitable for producing, for example, a pneumatic tire having excellent wear resistance, breaking strength, rolling resistance, wet skid resistance, etc. can be prepared. The rubber composition comprises a rubber ingredient (A) comprising a diene rubber comprising at least 20 mass% modified styrene-butadiene copolymer (a1) and at least 5 mass% modified conjugated diene polymer (a2) and a filler (B), wherein the modified conjugated diene polymer (a2) is a polymer obtained by modifying, with an alkoxysilane compound, active ends of a conjugateddiene polymer having a cis-1,4 bond content of 80% or higher, and the filler (B) comprises 2-100 parts by mass of carbon black (b1) and / or 30-100 parts by mass of silica (b2) per 100 parts by mass of the rubber ingredient (A).

Description

technical field [0001] The present invention relates to a rubber composition suitable for producing vulcanized rubber such as pneumatic tires excellent in wear resistance, breaking strength, rolling resistance, wet skid resistance, etc., as well as wear resistance, breaking strength, rolling resistance, A pneumatic tire with excellent wet skid resistance. Background technique [0002] With the demand for lower fuel consumption of automobiles in recent years, the development of rubber materials that reduce the rolling resistance of tires has been desired. In order to reduce the rolling resistance of the tire, it is sufficient to reduce the energy loss of the vulcanized rubber at low frequencies. That is, the tire temperature of a running car is 50-70°C. At this time, the frequency of the external force (calculated from the vehicle speed and the diameter of the tire) received by the tire (tread rubber) is tens of Hz. The smaller the energy loss, the better the fuel consumpti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L15/00C08C19/25C08F236/10C08K3/04C08K3/36
CPCB60C1/0016C08C19/44C08K3/013C08K3/04C08K3/36C08K5/548C08L9/00C08L9/06C08L15/00Y02T10/86C08L2666/08
Inventor 曾根卓男田中了司
Owner 株式会社引能仕材料
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