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Liquid silicone rubber and preparation method thereof

A technology of liquid silicone rubber and base rubber, applied in the field of preparation of liquid silicone rubber, can solve the problems of inconvenient solution, emulsion recovery, unfavorable automatic production, cumbersome process flow, etc. Tear strength, effect of prolonged operation time

Inactive Publication Date: 2019-11-12
HUBEI XINHAIHONG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the previous production method of liquid silicone rubber with addition vulcanization has the following disadvantages: 1) it is easy to produce solution polymerization and emulsion polymerization, and it is not convenient for the recovery of solution and emulsion; 2) the process flow is cumbersome and the equipment investment is large; 3) the catalyst used is usually It is a long-acting catalyst and needs to be removed by subsequent processes; 4) Flashing is prone to occur during processing, which is not conducive to automated production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A preparation method of liquid silicone rubber, comprising the steps of:

[0025] 1) Synthesis of base glue: Mix 70 parts by mass of raw material vinyl polydimethylsiloxane and 0.2 parts by mass of heat-resistant agent in a three-necked flask, treat it under reduced pressure at 50°C for 12 hours, and add mass parts The number of catalysts is 0.1, filled with nitrogen as a protective gas, the reaction temperature is 60 ° C, the reaction time is 60 minutes, and the base rubber is prepared. The vinyl content in the base rubber is 0.05mol% to 1mol%;

[0026] 2) Reinforcement of base rubber: mix 100 parts by mass of base rubber and 10 parts of reinforcing agent, and knead in vacuum at 120°C-140°C for 3h-6h to form a uniformly mixed mixture; The material is passed through a three-roll machine until there are no visible particles, and the reinforced base rubber is obtained;

[0027] 3) Cross-linking and curing of liquid silicone rubber: mix the reinforced base rubber, cross-l...

Embodiment 2

[0030] A preparation method of liquid silicone rubber, comprising the steps of:

[0031] 1) Synthesis of base glue: Mix 60 parts by mass of raw material vinyl polydimethylsiloxane and 0.3 parts by mass of heat-resistant agent in a three-necked flask, treat it under reduced pressure at 60°C for 10 hours, and add mass parts The number of catalysts is 0.2, filled with nitrogen as a protective gas, the reaction temperature is 60 ° C, the reaction time is 60 minutes, and the base rubber is prepared. The vinyl content in the base rubber is 0.07mol% to 0.9mol%;

[0032] 2) Reinforcement of base rubber: mix 100 parts by mass of base rubber and 10 parts of reinforcing agent, and knead in vacuum at 120°C for 6 hours to form a uniformly mixed mixture; pass the mixture through a three-roll machine Thin pass, until no visible particles, to obtain a reinforced base rubber;

[0033] 3) Cross-linking and curing of liquid silicone rubber: mix the reinforced base rubber, cross-linking agent, c...

Embodiment 3

[0036] A preparation method of liquid silicone rubber, comprising the steps of:

[0037] 1) Synthesis of base glue: Mix 65 parts by mass of raw material vinyl polydimethylsiloxane and 0.25 parts by mass of heat-resistant agent in a three-necked flask, treat under reduced pressure at 60°C for 11 hours, and add mass parts The number of catalysts is 0.15, filled with nitrogen as a protective gas, the reaction temperature is 70 ° C, the reaction time is 50 minutes, and the base rubber is prepared. The vinyl content in the base rubber is 0.05mol% to 1mol%;

[0038] 2) Reinforcement of base rubber: mix 100 parts by mass of base rubber and 50 parts of reinforcing agent, and knead in vacuum at 130°C for 5 hours to form a uniform mixture; pass the mixture through a three-roll machine Thin pass, until no visible particles, to obtain a reinforced base rubber;

[0039]3) Cross-linking and curing of liquid silicone rubber: mix the reinforced base rubber, cross-linking agent, catalyst and ...

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PUM

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Abstract

The invention belongs to the technical field of chemical engineering novel material, and more specifically relates to a preparation method of liquid silicone rubber. The preparation method comprises following steps: 1, synthesis of a base rubber; 2, reinforcing of the base rubber; 3, crosslinking solidification of liquid silicone rubber; and 4, curing moulding. According to the preparation method,addition solidification is adopted to prepare the liquid silicone rubber. In the processing process, no trimming is needed, precision is high, production period is short, excellent heat tearing performance is achieved, it is convenient for demoulsing, a plurality of processing modes including mould pressing, extrusion, and injection pressing can be adopted, and material automatic production can be realized.

Description

technical field [0001] The invention belongs to the technical field of new chemical materials, and in particular relates to a preparation method of liquid silicone rubber. Background technique [0002] Silicone materials have excellent high and low temperature resistance (-60°C to 310°C), superior physical and mechanical properties at high temperatures, aging resistance, and self-extinguishing properties; while fluorocarbon materials have good thermal stability (-27°C to 300°C), has extremely superior oil resistance and solvent resistance. However, with the continuous development of industrial technology, silicone materials have gradually exposed their shortcomings of poor oil resistance and solvent resistance, while organic fluorine materials have defects of poor low temperature resistance and difficult processing. [0003] There are two curing methods for the preparation of liquid silicone rubber, one is condensation type and the other is addition type; the oligomers used...

Claims

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Application Information

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IPC IPC(8): C08L83/07C08K3/36C08K3/26C08J5/18
CPCC08J5/18C08J2383/04C08K3/26C08K3/36C08K2003/262C08K2201/006C08L83/04
Inventor 陶明海黄立忠
Owner HUBEI XINHAIHONG CHEM
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