Modified rubber masterbatch, and rubber composition and vulcanized rubber produced therefrom, and the preparation processes for them

Patent metadata

Field	Value
Publication number	US-9290643-B2
Application number	US-201214354233-A
Country	US
Kind code	B2
Filing date	Oct 26, 2012
Priority date	Oct 26, 2011
Publication date	Mar 22, 2016
Grant date	Mar 22, 2016

Abstract

The present application relates to a modified rubber masterbatch and preparation method thereof, rubber composition prepared therewith and vulcanized rubber and preparation method thereof. The modified rubber component comprises uncrosslinked rubber and rubber particles having crosslinked structure dispersed therein, wherein the rubber particles having crosslinked structure are synthetic rubber particles and/or natural rubber particles, have an average particle size of 20-500 nm and a gel content of 60% by weight or higher, and wherein the uncrosslinked rubber is styrene-butadiene rubber. The weight ratio of the rubber particles having crosslinked structure to the uncrosslinked rubber is greater than 20:80 and less than or equal to 80:20. The rubber composition comprises a blend of modified rubber component and base rubber, in which the modified rubber masterbatch is present in an amount of 1 to 70 parts by weight, relative to per 100 parts by weight of the base rubber. The vulcanized rubber of the rubber composition has not only low rolling resistance and excellent wet skid resistance, but also excellent wear resistance, and thus can be used for producing high performance tread rubber.

First claim

The invention claimed is:

1. A modified rubber masterbatch, consisting of an uncrosslinked rubber and rubber particles having radiation crosslinked structure dispersed therein, wherein the rubber particles having radiation crosslinked structure are synthetic rubber particles and/or natural rubber particles with an average particle size of 20 to 500 nm, and a gel content of 60% by weight or higher, and the uncrosslinked rubber is a styrene-butadiene rubber; and wherein the weight ratio of the rubber particles having radiation crosslinked structure to the uncrosslinked rubber is greater than 20:80 and less than or equal to 80:20.

2. The modified rubber masterbatch according to claim 1 , characterized in that the rubber particles having radiation crosslinked structure are one or more selected from the group consisting of natural rubber particles, styrene-butadiene rubber particles, carboxylated styrene-butadiene rubber particles, nitrile butadiene rubber particles, carboxylated nitrile butadiene rubber particles, chloroprene rubber particles, polybutadiene rubber particles, silicone rubber particles, acrylic rubber particles, and styrene-butadiene-vinylpyridine rubber particles.

3. The modified rubber masterbatch according to claim 1 , characterized in that the rubber particles having radiation crosslinked structure are of homogeneous structure.

4. The modified rubber masterbatch according to claim 1 , characterized in that the weight ratio of the rubber particles having radiation crosslinked structure to the uncrosslinked rubber is 30:70-80:20.

5. The modified rubber masterbatch according to claim 1 , characterized in that the modified rubber masterbatch is obtained by mixing the components comprising the uncrosslinked rubber latex and a latex of the rubber particles having radiation crosslinked structure till homogeneous and then coagulating them, wherein the latex of the rubber particles having radiation crosslinked structure is a rubber latex obtained by radiation crosslinking.

6. A preparation process for the modified rubber masterbatch according to claim 1 , comprising the following steps:
(1) subjecting a latex of synthetic rubber and/or natural rubber to the radiation crosslinking and thereby providing the synthetic rubber and/or natural rubber particles in the latex with a crosslinked structure, the said gel content and meanwhile an average particle size fixed in the said average particle size range;
(2) mixing till homogeneous the above radiation crosslinked latex of the synthetic rubber and/or natural rubber with a latex of the uncrosslinked rubber according to the said weight ratio of the rubber particles having radiation crosslinked structure to the uncrosslinked rubber;
(3) coagulating the above mixed latices to obtain the said modified rubber masterbatch.

7. The preparation process according to claim 6 , characterized in that the latex of synthetic rubber and/or natural rubber latex is one or more selected from the group consisting of natural rubber latex, styrene-butadiene rubber latex, carboxylated styrene-butadiene rubber latex, nitrile butadiene rubber latex, carboxylated nitrile butadiene rubber latex, chloroprene rubber latex, polybutadiene rubber latex, silicone rubber latex or acrylic rubber latex, styrene-butadiene-vinylpyridine rubber latex and the like.

8. A rubber composition, comprising a blend of the modified rubber masterbatch according to claim 1 and a base rubber, wherein the modified rubber masterbatch is present in an amount of 1 to 70 parts by weight, relative to per 100 parts by weight of the base rubber.

9. The rubber composition according to claim 8 , characterized in that the base rubber is one or more selected from the group consisting of natural rubber, modified natural rubber, and synthetic rubber.

10. A preparation process for the rubber composition according to claim 8 , comprising a step of compounding the modified rubber masterbatch and the base rubber in the said amounts to obtain a rubber composition.

11. The preparation process according to claim 10 , characterized in that the preparation process for the modified rubber masterbatch comprising the following steps:
(1) subjecting a latex of synthetic rubber and/or natural rubber to the radiation crosslinking and thereby providing the synthetic rubber and/or natural rubber particles in the latex with a crosslinked structure, the said gel content and meanwhile an average particle size fixed in the said average particle size range;
(2) mixing till homogeneous the above radiation crosslinked latex of the synthetic rubber and/or natural rubber with a latex of the uncrosslinked rubber according to the said weight ratio of the rubber particles having radiation crosslinked structure to the uncrosslinked rubber;
(3) coagulating the above mixed latices to obtain the said modified rubber masterbatch.

12. A vulcanized rubber produced from the rubber composition according to claim 8 .

13. The modified rubber masterbatch according to claim 1 , wherein the rubber particles having radiation crosslinked structure are synthetic rubber particles and/or natural rubber particles with an average particle size of 50 to 200 nm.

14. The modified rubber masterbatch according to claim 13 , wherein the rubber particles having radiation crosslinked structure are synthetic rubber particles and/or natural rubber particles with an average particle size of 70 to 200 nm.

15. The modified rubber masterbatch according to claim 1 , wherein the rubber particles having radiation crosslinked structure are synthetic rubber particles and/or natural rubber particles with a gel content of 75% by weight or higher.

16. The modified rubber masterbatch according to claim 1 , characterized in that the rubber particles having radiation crosslinked structure are one or more selected from the group consisting of nitrile butadiene rubber particles, styrene-butadiene-vinylpyridine rubber particles, styrene-butadiene rubber particles, and carboxylated styrene-butadiene rubber particles.

17. The modified rubber masterbatch according to claim 1 , characterized in that the rubber particles having radiation crosslinked structure are one or more selected from the group consisting of styrene-butadiene-vinylpyridine rubber particles and nitrile butadiene rubber particles.

18. The modified rubber masterbatch according to claim 1 , characterized in that the rubber particles having radiation crosslinked structure nitrile butadiene rubber particles.

19. The modified rubber masterbatch according to claim 1 , characterized in that the weight ratio of the rubber particles having radiation crosslinked structure to the uncrosslinked rubber is 40:60-80:20.

20. The preparation process according to claim 6 , characterized in that the latex of synthetic rubber and/or natural rubber latex is one or more selected from the group consisting of nitrile butadiene rubber latex, styrene-butadiene-vinylpyridine rubber latex, styrene-butadiene rubber latex, and carboxylated styrene-butadiene rubber latex.

21. The preparation process according to claim 20 , characterized in that the latex of synthetic rubber and/or natural rubber latex is one or more selected from the group consisting of styrene-butadiene-vinylpyridine rubber latex and nitrile butadiene rubber latex.

22. The preparation process according to claim 21 , characterized in that the latex of synthetic rubber and/or natural rubber latex is nitrile butadiene rubber latex.

23. The rubber composition o

Assignees

• Qiao Jinliang
• Cong Yuexin
• Zhang Xiaohong
• Li Ying
• Gao Jianming
• Zhang Qianmin
• Song Zhihai
• Sun Yanling
• Lai Jinmei
• Song Peijun
• Cai Chuanlun
• Zhao Guoxun
• Zhang Hongbin
• Qi Guicun
• Wang Ya
• Li Binghai
• China Petroleum & Chemical
• Beijing Res Inst Chem Ind

Inventors

• Qiao Jinliang
• Cong Yuexin
• Zhang Xiaohong
• Li Ying
• Gao Jianming
• Zhang Qianmin
• Song Zhihai
• Sun Yanling
• Lai Jinmei
• Song Peijun
• Cai Chuanlun
• Zhao Guoxun
• Zhang Hongbin
• Qi Guicun
• Wang Ya
• Li Binghai

Classifications

• C08L21/00 Primary

  Compositions of unspecified rubbers · CPC title

• C08L7/00

  Compositions of natural rubber · CPC title

• C08L9/00

  Compositions of homopolymers or copolymers of conjugated diene hydrocarbons · CPC title

• C08L2205/22

  Mixtures comprising a continuous polymer matrix in which are dispersed crosslinked particles of another polymer · CPC title

• C08F20/44

  Acrylonitrile · CPC title