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Low-compression-deformation two-component addition-type low-hardness silicon rubber and preparation method thereof

A low compression deformation, two-component technology, applied in the field of silicone rubber, can solve the problems of large compression deformation value, poor tensile strength and tear strength, etc., and achieve small compression deformation value, high tensile strength and tear strength , good simulation performance

Inactive Publication Date: 2015-04-01
JIANGSU TIANCHEN NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a two-component addition type low hardness silicone rubber with low compression deformation and its preparation method to solve the problems of poor tensile strength and tear strength and large compression deformation value of traditional silicone rubber at low hardness.

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0031] The preparation method of the above-mentioned low compression deformation two-component addition molding low hardness silicone rubber includes the following steps:

[0032] a. Prepare component A

[0033] First add 50-80% of the formula amount of vinyl polysiloxane, formula amount of silane coupling agent and formula amount of precipitated silica into the kneader, stir at room temperature for 1 to 6 hours; heat up to 120-180°C, Stir for 1 to 6 hours under vacuum, then stop the vacuum, continue to add the remaining formula amount of vinyl polysiloxane to dilute, then add the formula amount of platinum catalyst, stir evenly to obtain component A;

[0034] b. Preparation of component B

[0035] First add 50-80% of the formula amount of vinyl polysiloxane, formula amount of silane coupling agent and formula amount of precipitated silica into the kneader, stir at room temperature for 1 to 6 hours; heat up to 120-180℃, Stir under vacuum for 1~6h, then stop vacuum, continue to add th...

Embodiment 1

[0038] (1) Preparation of component A

[0039] ①Mix 100Kg of octamethylcyclotetrasiloxane and 1.5Kg of tetramethyldivinyldisiloxane, add 0.2Kg of catalyst tetramethylammonium hydroxide under stirring, and increase the temperature to 120℃ for polymerization for 4h, then The temperature is raised to 200°C, and the low molecular weight is removed for 6h under a vacuum degree of 0.08~0.09MPa. After cooling, a vinyl polysiloxane is obtained. The viscosity at 25°C is 11000 mPa.s and the vinyl mass percentage is 0.42%.

[0040] ②Add 300Kg of vinyl polysiloxane, 34Kg of silane coupling agent (dimethyldiethoxysilane) and 240Kg of precipitated white carbon black into a 1000L kneader. After stirring, continue to stir at room temperature for 2h; warm to 140 ℃, stir under vacuum 0.8MPa for 3h, then stop the vacuum, add 100Kg vinyl polysiloxane after cooling down; add 1.28Kg chloroplatinic acid tetramethyldivinyldisiloxane complex, stir evenly, and get Component A;

[0041] (2) Preparation of co...

Embodiment 2

[0048] (1) Preparation of component A

[0049] ①Mix 100Kg of octamethylcyclotetrasiloxane and 1.5Kg of tetramethyldivinyldisiloxane, add 0.2Kg of catalyst tetramethylammonium hydroxide under stirring, and increase the temperature to 120℃ for polymerization for 4h, then The temperature is raised to 200°C, and the low molecular weight is removed for 6h under a vacuum degree of 0.08~0.09MPa. After cooling, a vinyl polysiloxane is obtained. The viscosity at 25°C is 11000 mPa.s and the vinyl mass percentage is 0.42%.

[0050] ②Add 290Kg of vinyl polysiloxane, 22Kg of silane coupling agent (dimethylcyclosiloxane) and 203Kg of precipitated white carbon black into a 1000L kneader. After stirring, continue to stir at room temperature for 2h; warm up to 170℃ , Stir for 3h under vacuum 0.8MPa, then stop vacuum, add 180Kg vinyl polysiloxane after cooling down; add 1.35Kg chloroplatinic acid tetramethyldivinyldisiloxane complex, stir evenly, and get the composition Part A;

[0051] (2) Preparat...

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Abstract

The invention discloses low-compression-deformation two-component addition-type low-hardness silicon rubber. The silicon rubber consists of a component A and a component B at the mass ratio of 1 to 1, wherein the component A is prepared from the following components in percentage by mass: 50-70% of vinyl polysiloxane, 3-10% of a silane coupling agent, 20-45% of precipitated white carbon black and 0.1-1% of a platinum catalyst; and the component B is prepared from the following components in percentage by mass: 50-70% of vinyl polysiloxane, 2-5% of a silane coupling agent, 20-45% of precipitated white carbon black, 2-20% of low-hydrogen polysiloxane and 0.1-0.5% of an inhibitor, wherein the mass percent of hydrogen in low-hydrogen polysiloxane is 0.05-1%. The invention further discloses a preparation method of the silicon rubber. The silicon rubber prepared by the invention is high in tensile strength and tearing strength, and low in compressive deformation value; and the preparation method is simple and easy to operate, and the preparation method has a certain industrial application value.

Description

Technical field [0001] The invention relates to the technical field of silicone rubber, in particular to a two-component addition molding low-hardness silicone rubber with low compression deformation and a preparation method thereof. Background technique [0002] Traditional silicone rubber is a kind of high and low temperature resistance (-65-250℃) and has excellent properties of polymer elastomer material. Its molecular flexibility is large and the interaction force between molecular chains is weak. Therefore, the tensile strength and tear strength of silicone rubber at low hardness are poor and the compression deformation value is greater than 30%. Low-hardness silicone rubber with good tensile strength and tear strength has high application value in the fields of electronics, automobiles and aviation. Therefore, the preparation of a silicone rubber with low compression deformation, low hardness, high tensile strength and high tear strength has important significance and wide...

Claims

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Application Information

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IPC IPC(8): C08L83/07C08L83/05C08K13/06C08K9/06C08K3/36C08G77/20C08G77/12
Inventor 陆磊王芳张旭
Owner JIANGSU TIANCHEN NEW MATERIALS
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