A kind of preparation method of addition type heat-resistant liquid silicone rubber composition

A technology of liquid silicone rubber and composition, applied in the field of silicone, can solve the problems of inability to improve heat resistance, uneven dispersion of metal oxides, poisoning of catalysts, etc., and achieves small shrinkage rate, small addition amount, and small particle size. Effect

Active Publication Date: 2017-02-08
CHANGZHOU INST OF CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above method of improving heat resistance, adding metal oxides is relatively simple and practical, and the cost is low, but the direct addition of metal oxides has uneven dispersion, and when the addition amount is too large, the heat resistance cannot be improved, and it is easy to cause in addition-type silicone rubber. Catalyst poisoning etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Synthetic example 1

[0040] Heat-resistant agent synthesis example 1 (by mass parts)

[0041] Add 162 parts of water and 0.016 parts of acetic acid into the flask, and add 204 parts of methyltrimethoxysilane dropwise while stirring. After the dropwise addition, continue stirring for 5 hours to obtain 366 parts of hydrolyzate. Take 30 parts of hydrolyzate, add 4.2 parts of ferric nitrate solution with a concentration of 20%, mix well, add dropwise to 600 parts of water and 15 parts of ammonia water with a concentration of 28%, after the addition is completed, heat up to 80°C, and add 3 parts of silicon Azane was continued to react for 2 hours to obtain a white powder, and the product was roasted at 300°C for 4 hours to finally obtain a light yellow powder heat-resistant agent a with an average particle size of 30 μm.

Synthetic example 2

[0042] Heat-resistant agent synthesis example 2 (by mass parts)

[0043] Add 540 parts of water and 0.86 parts of acetic acid into the flask, and add 594 parts of phenyltrimethoxysilane dropwise while stirring. After the dropwise addition, continue stirring for 1 hour to obtain 1134 parts of hydrolyzate. Take 50 parts of hydrolyzate, add 6.25 parts of ferric chloride solution with a concentration of 20%, mix well, add dropwise to 100 parts of water, 2.5 parts of ammonia water with a concentration of 28%, after the addition is completed, heat up to 80°C, add 4 parts Silazane was reacted for 2 hours to obtain a white powder, and the product was calcined at 450°C for 4 hours to finally obtain light yellow powder heat-resistant agent b with an average particle size of 37 μm.

Synthetic example 3

[0044] Heat-resistant agent synthesis example 3 (by mass parts)

[0045] Add 162 parts of water and 0.032 parts of acetic acid into the flask, and add 267 parts of methyltriethoxysilane dropwise while stirring. After the dropwise addition, continue stirring for 5 hours to obtain 429 parts of hydrolyzate. Take 30 parts of hydrolyzate, add 4.2 parts of cerium nitrate solution with a concentration of 20%, mix well, add dropwise to 125 parts of water and 3 parts of ammonia water with a concentration of 28%, after the addition is completed, heat up to 80°C, add 5 parts of six Methyldisiloxane was reacted for 2 hours to obtain a white powder, and the product was calcined at 300°C for 4 hours to finally obtain a light yellow powder heat-resistant agent c with an average particle size of 34 μm.

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PUM

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Abstract

The invention relates to an addition type heatproof liquid silicone rubber composition. The composition comprises polysiloxane with the mhydrophobic hydrophobic molecular chain containing at least two ethylenic linkages, organic hydrogen polysiloxane with the molecular chain containing at least two silicon-hydrogen bonds, a reinforcing filler, a heatproof agent which is iron oxide or cerium oxide supported spherical polysiloxane powder, an inhibitor and a catalyst. The heatproof agent has small particle sizes, is hydrophobic, can be easily dispersed in polysiloxanes, and realizes less addition; and the heatproof silicone rubber has the advantages of easy embedding, small shrinkage, and realization of the heat resistance temperature reaching above 300DEG C.

Description

technical field [0001] The invention belongs to the field of organosilicon, and relates to a heat-resistant additive and a preparation method of an addition-type heat-resistant liquid silicone rubber composition. Background technique [0002] Silicone rubber is a silicone polymer with a silicon-oxygen bond as the main chain. It has good properties such as high and low temperature resistance, insulation, and physiological inertness. Among them, high temperature resistance is one of the important properties of silicone rubber. It is widely used in printing Industry, Electronics, Appliances, Automotive, Aerospace. Silicone rubber can generally be used for a long time at -40°C-200°C, but with the increase in power, small volume, and high stability of electronic appliances, higher requirements are placed on the heat resistance of silicone rubber. The potting and sealing of electronic components such as capacitors and resistors requires long-term use at 250°C, and the ambient tem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L83/07C08L83/05C08K9/12C08K3/22C08K5/05
Inventor 刘勇陆居山单中亚王红丹王公应
Owner CHANGZHOU INST OF CHEM
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