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Rubber composition

A technology of rubber composition and compound, which is applied in transportation and packaging, rolling resistance optimization, special tires, etc., can solve problems such as mechanical strength, wear resistance physical properties may not be sufficient, rubber performance changes, filler dispersion is insufficient, etc. Excellent wear resistance, improved rolling resistance, and various performance effects

Inactive Publication Date: 2016-11-02
KURARAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the above-mentioned tire application, etc., there is a problem that even if it has appropriate physical properties such as mechanical strength and hardness at the time of manufacture, the performance of the rubber will change due to long-term use.
[0005] However, even when the rubber composition contains a liquid diene rubber, the dispersibility of the filler may not be sufficient, and the cross-linked product obtained from the rubber composition may have poor mechanical strength, abrasion resistance, and When the physical properties of consumables are not necessarily sufficient

Method used

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Examples

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Embodiment

[0160] Hereinafter, although an Example demonstrates this invention in more detail, this invention is not limited to these Examples.

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

[0162]

[0163] Oil-extended styrene-butadiene rubber: JSR1723 (manufactured by JSR Corporation)

[0164] (rubber component: 100 parts by mass, oil component: 37.5 parts by mass)

[0165] Styrene-butadiene rubber: JSR1500 (manufactured by JSR Corporation).

[0166]

[0167] Modified liquid polyisoprene obtained in Production Examples 1 to 12 described later.

[0168]

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

[0170]

[0171] Sulfur (micronized sulfur 200 mesh, manufactured by Tsurumi Chemical Industry Co., Ltd.).

[0172]

[0173] Vulcanization accelerator (1): ノクセラー CZ-G (manufactured by Ouchi Shinko Chemical Industry Co., Ltd.)

[0174] Vulcanization accelerator (2): ノクセラー D (manufactured by Ouchi Shinko Chemical...

manufacture example 1

[0184] Production Example 1: Production of Modified Liquid Polyisoprene (B-1)

[0185] The fully dried 5L autoclave was replaced with nitrogen, 1200g of hexane and 12.6g of n-butyllithium (17% by mass hexane solution) were added, the temperature was raised to 50°C, and the polymerization temperature was controlled to reach 50°C under stirring. Simultaneously, 1200 g of isoprene was gradually added and polymerized for 1 hour. Methanol was then 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, water was separated. The polymer solution after washing was vacuum-dried at 70° C. for 24 hours to obtain unmodified liquid polyisoprene (B′-1).

[0186] Next, 300 g of the obtained unmodified liquid polyisoprene (B'-1) was charged into ...

manufacture example 2

[0187] Production Example 2: Production of Modified Liquid Polyisoprene (B-2)

[0188] The fully dried 5L autoclave was replaced with nitrogen, 1200g of hexane and 26.2g of n-butyllithium (17% by mass hexane solution) were added, the temperature was raised to 50°C, and the polymerization temperature was controlled to reach 50°C under stirring. Simultaneously, 1200 g of isoprene was gradually added and polymerized for 1 hour. Methanol was then 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, water was separated. The polymer solution after washing was vacuum-dried at 70° C. for 24 hours to obtain unmodified liquid polyisoprene (B′-2).

[0189] Next, 300 g of the obtained unmodified liquid polyisoprene (B'-2) was charged into ...

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Abstract

To provide a rubber composition having excellent filler dispersability, a crosslinked product having excellent wear resistance and other properties, and a tire using said composition or said crosslinked product in a portion thereof and enabling improved rolling resistance performance, as well as improved steering stability and improved ice grip performance. A rubber composition containing, with respect to 100 parts by mass of a solid rubber (A): 0.1-10 parts by mass of a modified liquid diene rubber (B) obtained by adding a modified compound to a native liquid diene rubber (B') and having a functional group derived from said modified compound; and 20-150 parts by mass of a filler (C). The modified liquid diene rubber (B) satisfies the following (i)-(iv): (i) isoprene units are included in the amount of 50 mass% or more with respect to the total monomer units; (ii) the weight-average molecular weight (Mw) is 25,000-120,000; (iii) the modified compound is added in the amount of 3-40 parts by mass with respect to 100 parts by mass of the native liquid diene rubber (B'); and (iv) the average number of functional groups per molecule of the modified liquid diene rubber (B) is 15-80 groups.

Description

technical field [0001] The present invention relates to rubber compositions. Background technique [0002] Conventionally, rubber compositions in which mechanical strength is improved 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. In addition, since the rubber composition obtained by compounding the filler has high viscosity during kneading, rolling, and extrusion of the rubber, processing oil or the like is used as a plasticizer for the purpose of improving processability and fluidity. [0003] However, there is a problem in the above-mentioned tire application and the like that even if the rubber has appropriate physical properties such as mechanical strength and hardness at the time of manufacture, the properties of the rubber will change due to long-term use. This is caused by movement of plasticize...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L21/00B60C1/00C08C19/28C08K3/04C08K3/36C08L15/00
CPCB60C1/00C08L15/00C08L21/00C08L9/00C08K3/013Y02T10/86C08C19/28C08J3/24C08K3/04C08K3/36C08L9/06C08L2205/06
Inventor 香田大辅平田惠
Owner KURARAY CO LTD
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