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Branched polysiloxane as well as preparation method and application thereof

A polysiloxane and siloxane technology, applied in the direction without pigment coating, can solve the problems of poor product structure controllability, and achieve the effects of uniform distribution of cross-linking points, low viscosity and high functional group degree.

Active Publication Date: 2020-06-16
WANHUA CHEM GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent uses synthetic branched silicone oil as raw material, and after adding high-hydrogen-containing silicone oil and catalyst, solidifies to form a film at a certain temperature, but the cured product obtained by this method is cured by using high-hydrogen-containing silicone oil with high-density silicon-hydrogen bonds. Concentration of cross-linking points in cured products
Patent CN104892940 discloses a preparation method of siloxane, which uses trifunctional silane and end-capping agent to co-hydrolyze to obtain the product, but since there is no careful post-treatment such as removal of alcohols, the structure of the product is poorly controllable, and It synthesizes only branched silicones and not polysiloxanes containing D-mers

Method used

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  • Branched polysiloxane as well as preparation method and application thereof
  • Branched polysiloxane as well as preparation method and application thereof
  • Branched polysiloxane as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Add 45 parts of ethyl orthosilicate, 22 parts of tetramethyldisiloxane, 30 parts of tetramethyldivinyldisiloxane, and 0.1 part of trifluoromethanesulfonic acid into a three-necked flask, under nitrogen atmosphere for 70 Stir at ℃ for 3 hours, then slowly add 7.5 parts of deionized water dropwise, further hydrolysis and polycondensation for 3 hours, after the polycondensation reaction reaches equilibrium, raise the temperature to distill the ethanol generated by hydrolysis, cool down to 70 ℃ and add 0.1 parts of trifluoromethanesulfonic acid to continue the reaction 2h. After the reaction, wash with water to remove the acid and residual ethanol, etc., and then distill off the volatiles in the mixed solution under reduced pressure. The condition is 80°C / -0.09MPa / 2h, and the temperature is lowered to obtain a liquid multifunctional intermediate. The obtained product siloxane (III) has a vinyl content of 13.1% by mass and a silicon-hydrogen bond hydrogen content of 0.45% by...

Embodiment 2

[0044] Add 60 parts of phenyltriethoxysilane, 13 parts of tetramethyldisiloxane, 19 parts of tetramethyldivinyldisiloxane, and 0.1 part of trifluoromethanesulfonic acid into a three-necked flask, and in a nitrogen atmosphere, Stir at 70°C for 3 hours, then slowly add 7 parts of deionized water dropwise, further hydrolysis and polycondensation for 3 hours, after the polycondensation reaction reaches equilibrium, raise the temperature to distill the ethanol generated by hydrolysis, cool down to 70°C and add 0.1 part of trifluoromethanesulfonic acid, Continue to react for 2h. After the reaction, wash with water to remove the acid and residual ethanol, etc., and then distill off the volatiles in the mixed solution under reduced pressure. The condition is 80°C / -0.09MPa / 2h, and the temperature is lowered to obtain a liquid multifunctional intermediate. The obtained product siloxane (IV) has a mass percentage content of vinyl group of 8.68% and a silicon-hydrogen bond hydrogen mass p...

Embodiment 3

[0046] Add 54 parts of vinyltriethoxysilane, 16 parts of tetramethyldisiloxane, 22 parts of tetramethyldivinyldisiloxane, and 0.1 part of trifluoromethanesulfonic acid into a three-necked flask. Stir at 70°C for 3 hours, then slowly add 8 parts of deionized water dropwise, further hydrolysis and polycondensation for 3 hours, after the polycondensation reaction reaches equilibrium, raise the temperature to distill out the ethanol generated by hydrolysis, cool down to 70°C and add 0.1 parts of trifluoromethanesulfonic acid, Continue to react for 2h. After the reaction, wash with water to remove the acid and residual ethanol, etc., and then distill off the volatiles in the mixed solution under reduced pressure. The condition is 80°C / -0.09MPa / 2h, and the temperature is lowered to obtain a liquid multifunctional intermediate. The obtained product siloxane (IV) was measured by chemical titration with a mass percentage of vinyl groups of 23.3% and a silicon-hydrogen bond hydrogen mas...

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Abstract

The invention discloses branched polysiloxane as well as a preparation method and application thereof. The invention aims to prepare branched polysiloxane. Micromolecular polyfunctional silane is hydrolyzed and condensed into a silane intermediate under an acidic condition, and then the silane intermediate is subjected to equilibrium reaction with a silane ring body under the condition of a catalyst to obtain polysiloxane with low viscosity, high activity and high functional group density. In addition, the molecules of the polysiloxane prepared by the method contain silicon-hydrogen bonds andunsaturated double bonds at the same time, and a cured product with certain performance can be obtained through curing under the action of a platinum catalyst.

Description

technical field [0001] The invention relates to a branched polysiloxane and its preparation method and application, in particular to a preparation method of a branched polysiloxane capable of self-curing through hydrosilylation. [0002] technical background [0003] Because of its low viscosity and high reactivity, branched polysiloxane has been widely used in industries, cosmetics, detergents, release agents and other fields. [0004] At present, there are methods for synthesizing branched silicone oils reported in the literature, such as the patent US 20020061998, which reports the synthesis method of vinyl-terminated branched silicone oils, using vinyl-terminated silane and D4 as raw materials to synthesize branched silicone oils under the catalysis of trifluoromethanesulfonic acid. silicone oil. This patent uses synthetic branched silicone oil as raw material, and after adding high-hydrogen-containing silicone oil and catalyst, solidifies to form a film at a certain tem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/20C08G77/08D21H19/32
CPCC08G77/20C08G77/08D21H19/32
Inventor 曹骏张聪颖安冬刘志锋马伟封玲珑杨继鹏申学燕
Owner WANHUA CHEM GRP CO LTD
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