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Mixed milling type silicon rubber anti structural agent

A technology of silicone rubber and structure control agent, which is applied in the field of structure control agent, can solve the problems of increasing tear permanent deformation and resilience, reducing tear strength, and single function, so as to improve tear strength and tear strength , to avoid the smelly effect of rubber

Active Publication Date: 2006-06-14
ZHEJIANG XINAN CHEM INDAL GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently the most commonly used anti-structural agent is α, ω-dihydroxy oligomeric dimethyl siloxane, whose general formula is HO[(CH 3 ) 2 SiO] x H, x is usually between 10-20, and the hydroxyl content is its main performance index. The higher the hydroxyl content, the better the structural resistance. Using α, ω-dihydroxy oligomeric dimethylsiloxane as an anti-structural agent has Good structural resistance, easy to use, transparent mixed rubber, etc., but there are single functions, poor stability (often accompanied by dehydration condensation reaction), large dosage, easy to make the rubber sticky, and there is a problem with heating or vulcanization molding. Odor, slightly more dosage will reduce tear strength, increase tear permanent deformation and resilience

Method used

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  • Mixed milling type silicon rubber anti structural agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Take 300g of D4 and 36g of VMC, dehydrate 16g by distillation under reduced pressure, then add 60g of dimethyldimethoxysilane, stir evenly, heat up to 80°C, add 21g of granular activated clay, stir and react at constant temperature for 1 hour, and then slowly raise the temperature to 100°C After 3 hours of continuous stirring and heat preservation reaction at ℃, the temperature was lowered to 64°C, and 18g of water was added to 64°C heat preservation reaction for 3 hours, then cooled to normal temperature, filtered to remove active clay, and the filtrate was distilled under reduced pressure to remove 29g of low-molecular substances, and finally obtained 351g of colorless , transparent liquid, the yield is 88%, and its viscosity is 14.0mm 2 / s, the hydroxyl content is 5.94% (mass percentage, the same below), the methoxy content is 4.12%, and the vinyl content is 2.62%.

Embodiment 2

[0028] Take 296g D4, 70g VMC and 60g dimethyldimethoxysilane, stir evenly, then heat up to 80°C, add 18g granular activated clay, stir and react at constant temperature for 1 hour, then slowly raise the temperature to 100°C, continue to stir and keep warm for 3 hours , lower the temperature to 64°C, add 25g of water at 64°C and keep it warm for 3 hours, then cool to normal temperature, filter to remove activated clay, and distill the filtrate at 150°C (-0.1Mpa) under reduced pressure to remove 38g of low-molecular substances, and finally obtain 382g of colorless, Transparent liquid with a yield of 84% and a viscosity of 12.5mm 2 / s, the hydroxyl content is 7.24%, the methoxy content is 3.53%, and the vinyl content is 5.10%.

Embodiment 3

[0030]Take 296g of DMC and 54g of VMC and first carry out vacuum distillation to remove 16g of DMC and water, then add 58g of dimethyldiethoxysilane, stir evenly, heat up to 100°C, add 25g of cation exchange resin, stir and react at constant temperature for 1 hour, and then Slowly raise the temperature to 110°C and continue to stir and keep warm for 3 hours, then cool down to 78°C, add 14g of water at 78°C and keep warm for 3 hours, then cool to normal temperature, filter to remove activated clay, and distill the filtrate under reduced pressure to remove 21g of low molecular weight. Finally obtain 353g colorless, transparent liquid, yield is 87%, and its viscosity is 20.5mm 2 / s, the hydroxyl content is 5.58%, the ethoxy content is 4.02%, and the vinyl content is 3.72%.

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Abstract

The present invention provides a mixed type silicone rubber anti-structurizing agent. Its structure formula is alpha-alkoxy-omega-hydroxyoligodimethyl siloxane-methylvenyl siloxane copolymer. Besides, said invention also provides its chemical general formula and its advantages and characteristics.

Description

(1) Technical field [0001] The invention relates to a structure control agent for suppressing plasticity reduction of mixing type silicone rubber. (2) Background technology [0002] Due to its excellent weather resistance, electrical properties, low compression set, heat resistance and cold resistance, the mixing type silicone rubber has been widely used in electrical appliances, automobiles, construction, medical and food. each field. [0003] In the production process, structuring can easily lead to problems such as poor processability of mixing silicone rubber, difficulty in re-milling, short storage period, poor rheology and high Mooney viscosity, which may easily cause product defects. Severely structured mixed rubber is tough and elastic like vulcanized rubber, and it is extremely difficult to re-mill, or even impossible to re-mill. Two methods can be used to treat reinforcing filler silica in advance and add anti-structural agent during mixing. The treatment of sili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/20C08L83/04
Inventor 王伟詹学贵邵月刚邓冬云佘慧玲宋新锋
Owner ZHEJIANG XINAN CHEM INDAL GROUP
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