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Rubber composition

A technology of rubber composition and solid rubber, applied in tire parts, rolling resistance optimization, transportation and packaging, etc., can solve the problems of reducing Payne effect, difficult to improve rejection letter, etc., and achieve excellent wear resistance, rolling resistance, etc. The effect of impedance performance improvement

Active Publication Date: 2019-04-16
KURARAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, with regard to the physical properties of the cross-linked product obtained from the rubber composition, there are physical properties (such as improved wear resistance and improved rolling resistance) that have been difficult to achieve in the past, and there is still room for improvement in the prior art.
[0005] In addition, in order to improve the physical properties, the dispersion state of the filler in the cross-linked product may be involved. However, from the viewpoint of fully realizing the reduction of the Payne effect, which is an index of improving the dispersibility of the filler in the rubber composition, for example, conventional There is still room for improvement in the technology

Method used

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Examples

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Embodiment

[0160] Hereinafter, the present invention will be described in further detail through examples, but the present invention is not limited to these examples.

[0161] Each component used in this Example and a comparative example is as follows.

[0162]

[0163] Solution polymerization styrene-butadiene rubber: HPR355 (manufactured by JSR Co., Ltd.) is coupled with alkoxysilane and introduced into the terminal, R 1 , R 2 and R 3 =-OCH 3 , R 4 and R 5 =H, n=3), styrene content: 28% by mass, vinyl content: 56% by mass)

[0164] Butadiene rubber: BR01 (manufactured by JSR Corporation, Mw: 550,000, cis-body content 95% by mass)

[0165] Emulsion-polymerized styrene-butadiene rubber: JSR1500 (manufactured by JSR Corporation).

[0166]

[0167] Modified liquid diene rubbers obtained in Production Examples 1 to 12 and liquid diene rubbers obtained in Production Examples 13 to 14 described later.

[0168]

[0169] Silica: ULTRASIL7000GR (manufactured by Ebonick Degusa Japan...

manufacture example 1

[0187] Production Example 1: Production of Modified Liquid Diene Rubber (B-1)

[0188] Replace the well-dried 5L autoclave with nitrogen, put in 1150g of hexane and 97.9g of n-butyllithium (17% by mass hexane solution), heat up to 50°C, and control the polymerization temperature to reach 50°C under stirring conditions , while gradually adding 1250 g of butadiene, polymerization was performed for 1 hour. Thereafter, methanol was added to terminate the polymerization reaction to obtain a polymer solution. Water was added to the obtained polymer solution and stirred, and the polymer solution was washed with water. After the stirring was completed and the separation of the polymer solution phase and the water phase was confirmed, the water was separated. The polymer solution after washing was vacuum-dried at 70° C. for 24 hours to obtain an unmodified liquid diene rubber (B′-1).

[0189] Next, 690 g of the obtained unmodified liquid diene rubber (B'-1) was charged into an autoc...

manufacture example 2

[0190] Production Example 2: Production of Modified Liquid Diene Rubber (B-2)

[0191] A fully dried 5L autoclave was replaced with nitrogen, and 1100g of hexane and 204g of n-butyllithium (17% by mass hexane solution) were put into it. After the temperature was raised to 50°C, under stirring conditions, the polymerization temperature was controlled so that the polymerization temperature reached 50°C. Simultaneously, 1300 g of butadiene was gradually added to carry out polymerization for 1 hour. Thereafter, methanol was added to terminate the polymerization reaction to obtain a polymer solution. Water was added to the obtained polymer solution and stirred, and the polymer solution was washed with water. After the stirring was completed and the separation of the polymer solution phase and the water phase was confirmed, the water was separated. The polymer solution after washing was vacuum-dried at 70° C. for 24 hours to obtain an unmodified liquid diene rubber (B′-2).

[019...

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Abstract

To provide: a rubber composition from which a crosslinked product having excellent wear resistance and mechanical strength, such as tensile strength, can be obtained, the state of dispersion of a filler in the crosslinked product obtained from the rubber composition being ideal for improving physical properties; said crosslinked product; and a tire that uses, in a portion thereof, said compositionor said crosslinked product, and that is capable of achieving an improvement in rolling resistance and steering stability. [Solution] Disclosed is a rubber composition comprising, per 100 parts by mass of a solid rubber (A): from 0.1 to 50 parts by mass of a modified liquid diene rubber (B) having a functional group derived from a silane compound represented by formula (1); and from 20 to 200 parts by mass of a filler (C). The modified liquid diene rubber (B) satisfies the following (i) to (iii): (i) the weight-average molecular weight (Mw) is greater than or equal to 1,000 to less than 15,000; (ii) the vinyl content is less than or equal to 70 mol%; and (iii) the average number of functional groups per molecule of the modified liquid diene rubber (B) is from 1 to 20.

Description

technical field [0001] The present invention relates to rubber compositions. Background technique [0002] Conventionally, rubber compositions having improved mechanical strength by adding fillers such as silica and carbon black to rubber components such as natural rubber and styrene-butadiene rubber have been widely used in tire applications requiring abrasion resistance and mechanical strength. It is said that the dispersion state of the filler in the cross-linked product of the filler-containing rubber composition may affect the physical properties of the cross-linked product (such as mechanical properties, wear resistance, and rolling resistance). However, in this filler-containing rubber composition, the affinity between the rubber and the filler is not necessarily high, and the fillers interact with each other, so the dispersibility of the filler may not be sufficient, and sometimes it is not necessary to improve the physical properties of the crosslinked product. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L21/00B60C1/00C08C19/25C08J3/24C08K3/04C08K3/36C08L15/00
CPCB60C1/00C08C19/25C08J3/24C08K3/04C08K3/36C08L15/00C08L21/00C08L7/00C08L9/00C08L9/06Y02T10/86C08K9/06C08L15/02C08K2201/011C08K3/013C08K2201/003C08L2312/00
Inventor 前田裕美香田大辅神原浩S.太田
Owner KURARAY CO LTD
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