Preparation method of organosilicon polymer with nonlinear structure

A silicone, polymer technology, applied in the polymer field

Active Publication Date: 2015-02-04
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These initiators are single or dual active, so only linear polysiloxanes can be prepared

Method used

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  • Preparation method of organosilicon polymer with nonlinear structure
  • Preparation method of organosilicon polymer with nonlinear structure
  • Preparation method of organosilicon polymer with nonlinear structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Prepare three active species initiators: with 100 parts by weight of octamethylcyclotetrasiloxane (D 4 ), 4 parts by weight (CH 3 ) 4 NOH and 4 parts by weight of methyltriethoxysilane were reacted at 110° C. for 2 hours to obtain a transparent oily three-active species initiator with a viscosity of 100 mPa·s.

[0040] Preparation of three-arm star silicone rubber: with 100 parts by weight of octamethylcyclotetrasiloxane (D 4 ), 1.5 parts by weight of the above-mentioned three active species initiators, 0.5 parts by weight of hexamethyldisiloxane and 0.15 parts by weight of tetramethyltetravinyl cyclotetrasiloxane (V 4 ) at 120° C. for 4 hours of polymerization reaction, after the polymerization reaction was completed, 0.2 parts by weight of trimethylchlorosilane was added for devolatilization to obtain a nonlinear silicone rubber raw rubber. Yield by D 4 The meter is 90%, the molecular weight is 700,000, and the vinyl content is 0.15%.

Embodiment 2

[0042] Prepare three active species initiators: with 100 parts by weight of octamethylcyclotetrasiloxane (D 4 ), 4 parts by weight of NaOH and 4 parts by weight of phenyltriethoxysilane were reacted at 130° C. for 5 hours to obtain a three-active species initiator with a transparent oily viscosity of 100 mPa·s.

[0043] Prepare three-arm star-shaped fluorosilicone rubber: with 100 parts by weight of methyl trifluoropropyl cyclotrisiloxane (D 3 F), 2 parts by weight of the above-mentioned three active species initiators, 0.5 parts by weight of hexamethyldisiloxane and 0.01 to 2 parts by weight of tetramethyltetravinyl cyclotetrasiloxane (V 4 ) at 130° C. for 8 hours, and after the polymerization, 0.2 parts by weight of trimethylchlorosilane was added for devolatilization to obtain nonlinear fluorosilicone rubber. Yield by D 3 The F count is 85%, the molecular weight is 850,000, and the vinyl content is 0.15%.

Embodiment 3

[0045] Prepare three active species initiators: with 100 parts by weight of octamethylcyclotetrasiloxane (D 4 ), 2.5 parts by weight of KOH and 4 parts by weight of ethyltrimethoxysilane were reacted at 120° C. for 5 h to obtain a three-active species initiator with a transparent oily viscosity of 200 mPa·s.

[0046] Prepare three-arm star-shaped phenyl silicone rubber: with 100 parts by weight of octamethylcyclotetrasiloxane (D 4 ), 20 parts by weight of tetramethyltetraphenylcyclotetrasiloxane (P 4 ), 2 parts by weight initiator, 0.5 parts by weight hexamethyldisiloxane and 0.15 parts by weight tetramethyltetravinyl cyclotetrasiloxane (V 4 ) at 120° C. for 4 hours of polymerization reaction, after the polymerization reaction was completed, 0.2 parts by weight of trimethylchlorosilane was added for devolatilization to obtain a nonlinear phenyl silicone rubber raw rubber. Yield by P 4 The meter is 90%, the molecular weight is 700,000, and the vinyl content is 0.15%.

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Abstract

The invention relates to a preparation method of an organosilicon polymer with a nonlinear structure. The organosilicon polymer with the nonlinear structure is obtained by carrying out polymerization reaction on a cyclic organosilicon monomer, a multi-active species anionic initiator, a molecular weight control agent and a vinyl monomer, wherein the multi-active species anionic initiator is prepared by reaction among the cyclic organosilicon monomer, a base and alkoxysilane. According to the preparation method of the multi-active species anionic initiator, the cyclic organosilicon monomer is initiated by virtue of the multi-active species anionic initiator to carry out ring-opening polymerization and thus the organosilicon polymer with the nonlinear structure is prepared. The organosilicon polymer, compared with a linear polymer, has higher melt elasticity and higher viscosity and the mixed rubber prepared from the organosilicon polymer has good rebound elasticity and low-compression permanent deformation.

Description

technical field [0001] The invention relates to polymers, in particular to a preparation method of a non-linear structure silicone polymer. Background technique [0002] Silicone materials have excellent high and low temperature resistance (-60~300°C), aging resistance, ozone resistance, physiological inertness, self-extinguishing and electrical insulation, making them unmatched by other organic polymer materials. Therefore, it has been widely used in aerospace, electronic and electrical, light industry, textile, machinery, construction, transportation, medical and health, agriculture, daily life, etc., and has become an important and necessary product in the national economy. Indispensable new polymer materials. Heat vulcanized silicone rubber and fluorosilicone rubber are the most important and widely used representatives of silicone materials. At present, there are thousands of brands of silicone or fluorosilicone rubber compounds on the market, but they are all based o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/20C08G77/06
Inventor 郑安呐许祥管涌危大福刘俊杰
Owner EAST CHINA UNIV OF SCI & TECH
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