Double-component low-hardness silicone rubber and preparation method thereof

A low-hardness, two-component technology, applied in the field of silicone rubber manufacturing, can solve the problems of inability to meet various use requirements, influences, single components of low-hardness silicone rubber, etc., to achieve easy operation, improve tensile strength and tear resistance. Strength, simple method

Inactive Publication Date: 2017-05-31
镇江高美新材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the low-hardness silicone rubber in the prior art has a single compon

Method used

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  • Double-component low-hardness silicone rubber and preparation method thereof

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example 1

[0028] A two-component low-hardness silicone rubber, the preparation method of which is as follows:

[0029] (1) Preparation of component A

[0030] ①Mix 100Kg of octamethylcyclotetrasiloxane and 1.5Kg of tetramethyldivinyldisiloxane, add 0.2Kg of catalyst tetramethylammonium hydroxide under stirring state, heat up to 120°C and polymerize for 4 hours , and then raised the temperature to 200°C, delowering the molecule for 6 hours under a vacuum of 0.08-0.09MPa, and obtained vinylpolysiloxane after cooling, with a viscosity of 11000mPa.s and a vinyl content of 0.42%.

[0031] ②Add 300Kg of vinyl polysiloxane, 34Kg of hexamethylsilazane and 240Kg of the specific surface area to 380m2 into a 1000L kneader 2 / g fumed silica powder, stir to form a group and continue to stir at room temperature for 2 hours; heat up to 160-170°C, stir for 3 hours under vacuum 0.8MPa, then stop the vacuum, add 100Kg vinyl polysiloxane after cooling down; add 1. 28Kg platinum complex, stir evenly to o...

example 2

[0039] A two-component low-hardness silicone rubber, the preparation method of which is as follows:

[0040] (1) Preparation of component A

[0041]①Mix 100Kg of octamethylcyclotetrasiloxane and 1.5Kg of tetramethyldivinyldisiloxane, add 0.2Kg of catalyst tetramethylammonium hydroxide under stirring state, heat up to 120°C and polymerize for 4 hours , and then raised the temperature to 200°C, delowering the molecule for 6 hours under a vacuum of 0.08-0.09MPa, and obtained vinylpolysiloxane after cooling, with a viscosity of 11000mPa.s and a vinyl content of 0.42%.

[0042] ②Add 290Kg of vinyl polysiloxane, 28.76Kg of hexamethylsilazane and 203Kg of the specific surface area to 380m2 into a 1000L kneader 2 / g fumed silica powder, stir at room temperature and continue to stir for 2 hours after stirring into agglomerates; raise the temperature to 160-170°C, stir for 3 hours under a vacuum of 0.8MPa, then stop the vacuum, add 183.67Kg vinyl polysiloxane after cooling down; Add 1...

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Abstract

The invention relates to a double-component low-hardness silicone rubber and a preparation method thereof. The double-component low-hardness liquid silicone rubber comprises two components A and B, the mass ratio of A to B is 1:1, wherein the component A comprises 50-70 parts of vinyl-terminated organopolysiloxane with the viscosity of 5000-15000 mPa.s, 20-45 parts of fumed silica powder with the specific area of 200-380 m<2>/g, and 0.01-0.5 part of platinum catalyst; the component B comprises 50-70 parts of vinyl-terminated organopolysiloxane with the viscosity of 5000-15000 mPa.s, 20-45 parts of fumed silica powder with the specific area of 200-380 m<2>/g, 5-10 parts of polysiloxane with low hydrogen content of 0.05-0.2%, and 0.01-0.03 part of inhibitor. The prepared double-component low-hardness silicone rubber forms a soft elastic material after being vulcanized, is environmentally friendly, non-toxic, and good in simulation performance, and can be used to make flexible silicone products like the human body, insoles, non-slip mats and the like, in addition, the double-component low-hardness silicone rubber is high in tensile strength and tearing strength, and is suitable or the fields of electronics, automobiles, aviation and the like having requirements on complicated shape or high precision.

Description

technical field [0001] The invention relates to the technical field of silicone rubber manufacture, in particular to a two-component low-hardness silicone rubber and a preparation method thereof. Background technique [0002] Low-hardness silicone rubber has good tensile strength and tear strength, and has high application value in the fields of electronics, automobiles and aviation industries where a large number of silicone rubber products are small parts with complex structures. Traditional silicone rubber is a kind of polymer elastomer material with high and low temperature resistance (-65-250°C) and excellent performance. Its molecular flexibility is large, and the interaction force between molecular chains is weak, so the tensile strength and tear strength of silicone rubber are poor at low hardness. Therefore, it is of great significance and wide application value to prepare a silicone rubber with low hardness, high tensile strength and high tear strength. [0003] ...

Claims

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Application Information

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IPC IPC(8): C08L83/07C08L83/05C08K3/36C08G77/20C08G77/38
CPCC08L83/04C08G77/20C08G77/38C08K2201/006C08K2201/014C08L2205/025C08K3/36
Inventor 王超陆磊
Owner 镇江高美新材料有限公司
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