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Pugging type silicon rubber structured control agent

A technology of acid catalyst and siloxane, which is applied in the field of mixing type silicone rubber structure control agent, can solve the problems of reducing tear strength, reducing mechanical properties of silicone rubber, increasing tear permanent deformation and resilience, etc., to achieve Improve tear resistance and resilience, improve tear resistance and resilience, and improve mechanical strength

Active Publication Date: 2006-12-27
ZHEJIANG XINAN CHEM INDAL GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition to hydroxy silicone oil, diphenyl dihydroxy silane, silazane, low molecular weight alkoxy silane, etc. can also be used as anti-structuring control agents, but they all have single function, poor stability, slightly large dosage, and easy to make glue The material is sticky, reducing the tear strength, increasing the permanent deformation and resilience at break, etc.
Diphenyldihydroxysilane can also be used as a structural control agent and can improve the heat resistance of the rubber compound, but diphenyldihydroxysilane is solid, and it must be cooled at 150°C-250°C before adding peroxide after mixing. Heat treatment for 0.5-1.0 hours can exert its structure control effect, which is inconvenient to use
Most of the vinyl groups of the added polyvinyl silicone oil are on the side chains, and the activity is not good enough
By adding polyvinyl silicone oil, although the tear strength can be improved, because the added polyvinyl silicone oil is equivalent to a plasticizer relative to the base rubber, it is easy to reduce other mechanical properties of silicone rubber.

Method used

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  • Pugging type silicon rubber structured control agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Take 310g of DMC and carry out vacuum distillation to remove 14g of DMC and water, then add 105g of methylvinyldimethoxysilane, stir evenly, then raise the temperature to 100°C, add 21g of granular activated clay, stir and react at constant temperature for 1 hour, and then slowly Raise the temperature to 120°C, continue to stir and keep warm for 3 hours, then cool down to normal temperature, filter to remove activated clay, and distill the filtrate under reduced pressure at 120°C and -0.1Mpa to remove 30g of low-molecular substances, and finally obtain 364g of colorless, transparent liquid. 6.5mm 2 / s, the methoxy content is 8.82% (the methoxy content is the weight percentage, the same below), and the vinyl content is 14.0% (the vinyl content is the mole percentage, the same below).

Embodiment 2

[0031] Take 310g of DMC and carry out vacuum distillation to remove 14g of DMC and water, then add 128g of methylvinyldiethoxysilane, stir evenly, then heat up to 120°C, add 21g of granular activated clay, stir and keep warm for 4 hours, then cool to room temperature , filtered to remove activated clay, and the filtrate was distilled under reduced pressure at 120°C and -0.1Mpa to remove 32g of low-molecular substances, and finally obtained 384g of a colorless, transparent liquid with a viscosity of 7.0mm 2 / s, the ethoxy content is 12.8%, and the vinyl content is 13.8%.

Embodiment 3

[0033] Take 310g of DMC and carry out vacuum distillation to remove 14g of DMC and water, then add 105g of methylvinyldimethoxysilane, stir evenly, then raise the temperature to 100°C, add 21g of granular activated clay, stir and react at constant temperature for 1 hour, and then slowly After heating up to 120°C and continuing to stir and keep warm for 3 hours, cool down to 64°C, add 24g of water at 78°C and keep warm for 3 hours. 25g of low-molecular substances, finally obtained 390g of colorless, transparent liquid with a viscosity of 11.0mm 2 / s, the hydroxyl content is 3.02%, the methoxy content is 5.29%, and the vinyl content is 13.2%.

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Abstract

The invention discloses a polysiloxane polymer, and its general formula is: R2O(SiR12O)xSiOR3R4CH=CH2, R1 is monobasic hydrocarbyl group with carbon number being 1-12, R2 is hydrogen atom or alkyl, x is integral number from 1 to 50, R3 is hydrogen atom or alkyl, R4 is alkyl or alkoxy; the invention also provides compound containing at least one said polymer. The provided polymer and its compound can be used as multifunctional control agent for silicon rubber structure, and the effect is good, it also inhibits plasticity reduction and increases mechanical property and rebound elasticity of silicon rubber sulfide rubber.

Description

(1) Technical field [0001] The invention relates to a multifunctional mixing-type silicone rubber structuring control agent, which has a good anti-structuring effect, can inhibit the plasticity reduction of the mixing-type silicone rubber, and improve the mechanical properties and resilience of the mixing-type silicone rubber vulcanizate . (2) Background technology [0002] Usually, raw silicone rubber needs to be reinforced with fumed or precipitated silica. Since the specific surface area of ​​silica exceeds 100m 2 / g, and the surface contains a large number of SiOH groups, and the SiOH groups and their adsorbed water are easy to interact with the Si-O bonds or Si-OH bonds in the raw rubber molecules to form a three-dimensional network structure and produce structural phenomena. Structuralization 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, whic...

Claims

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Application Information

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IPC IPC(8): C08G77/50C08G77/08C08L83/14
Inventor 王伟邵月刚詹学贵佘慧玲邓冬云
Owner ZHEJIANG XINAN CHEM INDAL GROUP
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