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Modified natural rubber masterbatch and method for production thereof, and rubber composition and tire

A natural rubber latex, natural rubber technology, applied in special tires, tire parts, transportation and packaging, etc., can solve problems such as insufficient reinforcement performance, and achieve the effect of improving low loss.

Inactive Publication Date: 2007-12-05
BRIDGESTONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, rubber compositions using natural rubber master batches are insufficient in reinforcing properties, so there is still room for improvement in abrasion resistance and fracture characteristics

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] The field latex was centrifuged with a latex separator [manufactured by Saito Enshin Kogyo Co., Ltd.] at 7500 rpm to obtain concentrated latex having a dry rubber concentration of 60%. 1000 g of concentrated latex was charged into a stainless steel reactor equipped with a stirrer and a temperature regulating jacket, and 3.0 g of methacrylic acid N,N-di The preformed emulsion in ethylaminoethyl ester and 990 mL of water was then stirred at room temperature for 30 minutes while being replaced with nitrogen. Subsequently, 1.2 g of t-butyl hydroperoxide and 1.2 g of tetraethylenepentamine were added as polymerization initiators, and a reaction was performed at 40° C. for 30 minutes, whereby a modified natural rubber latex A was obtained.

[0060] Then, the modified natural rubber latex A prepared as described above was coagulated by adding formic acid to adjust the pH to 4.7. The solid thus obtained was treated 5 times with a clapper, crushed by a shredder and dried by a h...

Embodiment 2

[0062] Modified natural rubber latex B was obtained in the same manner as in Production Example 1, except that 1.7 g of 4-vinylpyridine was added as a monomer instead of 3.0 g of N,N-diethylaminoethyl methacrylate. In addition, modified natural rubber b was obtained from modified natural rubber latex B in the same manner, and as a result of analysis, it was confirmed that 100% of the added monomer was introduced into the natural rubber molecule. Therefore, the grafted amount of the monomer in the modified natural rubber b was 0.28% by mass based on the rubber component in the natural rubber latex.

Embodiment 3

[0064] Modified natural rubber latex C was obtained in the same manner as in Production Example 1, except that 1.7 g of acrylonitrile was added as a monomer instead of 3.0 g of N,N-diethylaminoethyl methacrylate. In addition, modified natural rubber c was obtained from modified natural rubber latex C in the same manner, and as a result of analysis, it was confirmed that 100% of the added monomer was introduced into the natural rubber molecule. Therefore, the grafted amount of the monomer in the modified natural rubber c was 0.28% by mass based on the rubber component in the natural rubber latex.

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Abstract

This invention provides a method for producing a modified natural rubber masterbatch, which comprises the step of mixing a modified natural rubber latex, which is formed by adding a polar group-containing monomer to a natural rubber latex to graft-polymerize the polar group-containing monomer onto a natural rubber molecule in the natural rubber latex, with a slurry solution formed by previously dispersing a filler into water, and a modified natural rubber masterbatch produced by the method and capable of highly improving a low loss factor, a wear resistance and fracture characteristics of a rubber composition.

Description

technical field [0001] The present invention relates to a modified natural rubber masterbatch and a production method thereof, as well as a rubber composition and a tire using the modified natural rubber masterbatch, and more particularly relates to a modified natural rubber and a filler capable of greatly improving the rubber Composition of low loss, abrasion and fracture resistance modified natural rubber masterbatch. Background technique [0002] Recently, reduction in fuel consumption of motor vehicles has been strongly demanded, and thus tires with low rolling resistance have been demanded. For this purpose, a rubber composition having low tan δ (hereinafter referred to as low loss) and excellent in low heat build-up is required as a rubber composition for a tread or the like of a tire. In addition, rubber compositions for treads are required to be excellent in abrasion resistance and fracture characteristics in addition to low loss properties. [0003] In order to im...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/22C08K3/22B60C1/00C08K3/36C08K3/04C08L21/00
Inventor 近藤肇
Owner BRIDGESTONE CORP
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