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A kind of high tear-resistant silicone rubber nanocomposite and preparation method thereof

A silicone rubber nano-composite technology, applied in the field of silicone rubber, can solve the problems of weak force of carbon nanotubes, uneven dispersion, weak matrix interface, etc.

Active Publication Date: 2017-10-13
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Carbon nanotubes are composed of carbon rings composed of six carbons, and there is a strong force between carbon nanotubes, so it is difficult for carbon nanotubes to disperse uniformly in the matrix, and because the surface of carbon nanotubes lacks active groups, so The force between carbon nanotubes and the matrix is ​​very weak, and carbon nanotubes always have the disadvantages of uneven dispersion and weak interaction with the matrix interface when added to the rubber matrix

Method used

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  • A kind of high tear-resistant silicone rubber nanocomposite and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

comparative example 1

[0017] Put 100 grams of silicone rubber with a vinyl content of 0.1-0.2% and a molecular weight of 550,000-600,000 on a double-roll mill at room temperature. After the rolls are stabilized, add 40 parts of fumed white carbon black and 5 parts of hydroxyl silicone oil. 1. 0.5 part of dicumyl peroxide, after fully mixing, thin pass 4 times to lower the sheet, then vulcanize on a flat vulcanizing machine with a temperature of 160°C and a pressure of 15MPa. The mechanical properties of the tested material are shown in Table 1:

comparative example 2

[0019] Put 100 grams of silicone rubber with a vinyl content of 0.1-0.2% and a molecular weight of 550,000-600,000 on a double-roll mill at room temperature. After the rolls are stabilized, add 30 parts of fumed white carbon black and 3 parts of hydroxyl silicone oil. , 5 parts of carbon nanotubes, 0.8 parts of 2,5-dimethyl-2,5-bis(tert-butylperoxy) hexane, after fully mixing, thin pass 4 times to lower the sheet, and then at a temperature of 170 ℃, and the pressure is 15MPa on a flat vulcanizing machine. The mechanical properties of the tested materials are shown in Table 1:

Embodiment example 1

[0021] Put 100 grams of silicone rubber with a vinyl content of 0.1-0.2% and a molecular weight of 550,000-600,000 on a double-roll mill at room temperature. After the rolls are stabilized, add dimethyldiphenylthiuram disulfide 0.6 50 parts of fumed white carbon black, 6 parts of hydroxy silicone oil, 3 parts of carbon nanotubes, 3.5 parts of benzoyl peroxide. Vulcanized on a 15MPa flat vulcanizing machine, the mechanical properties of the tested materials are shown in Table 1:

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Abstract

The invention discloses a preparation method of a silicone rubber nano composite with the high tear resistance. The composite is prepared from, by weight, 100 parts of silicone rubber, 3-10 parts of carbon nano tubes, 30-50 parts of fumed silica, 3-6 parts of hydroxyl silicone oil, 0.5-3.5 parts of vulcanizing agents and 0.2-0.8 part of interface agents. According to the silicone rubber nano composite with the high tear resistance and the preparation method thereof, by selecting and using the interface agents, the problems that when the carbon nano tubes serve as reinforcing fillers, the carbon nano tubes are unevenly dispersed in the silicone rubber, and the interfacial action of the carbon nano tubes and the silicone rubber is weak are solved, and the tearing property of the silicone rubber nano composite is significantly improved.

Description

technical field [0001] The invention relates to a high-tear-resistant silicone rubber nanocomposite and a preparation method thereof, belonging to the technical field of silicone rubber. Background technique [0002] Silicone rubber is a linear polysiloxane polymer elastomer whose main chain is composed of -Si-O- and side chains are composed of organic groups. Due to its unique main chain composition, it has high and low temperature resistance, ozone resistance, and Radiation, electrical insulation, good biocompatibility, high air permeability, physiological inertia and other advantages, so silicone rubber is used in aerospace, chemical instrumentation, agriculture, medical and health, and electronic and electrical industries. However, the strength of silicone rubber is very poor, especially the tear strength is very poor, which greatly limits the application of silicone rubber. Therefore, improving the strength of silicone rubber, especially the tear strength, so that the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L83/07C08L83/06C08K13/04C08K7/24C08K3/36
Inventor 吴友平杨超男孙钲张立群卢咏来
Owner BEIJING UNIV OF CHEM TECH
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