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Preparation method of organosilicon copolymer

A technology of organosilicon and copolymers, applied in the field of polymers, can solve problems such as large differences in reaction speed, difficulty in industrial production, and difficulty in obtaining uniformly distributed copolymers.

Active Publication Date: 2017-01-18
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Copolyfluorosilicone rubber can be passed through methyl trifluoropropyl cyclotrisiloxane (D 3 F) and hexamethylcyclotrisiloxane (D 3 ) or octamethylcyclotetrasiloxane (D 4 ) copolymerization to prepare, but due to D 3 F and D 3 or D 4 The difference in polymerization reaction speed is too large, it is difficult to obtain a uniformly distributed copolymer, and the molecular weight is small, it is difficult to industrialize production

Method used

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  • Preparation method of organosilicon copolymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Add 7kg hydroxyl silicone oil (HO[(CH 3 ) 2 SiO] n H, n≈3), 3kg hydroxyfluorosilicone oil (HO[CH 3 (CH 2 CH 2 CF 3 )SiO] n H, n≈3) and 20g hydroxyl-terminated vinyl silicone oil (HO[CH 3 (CH=CH 2 )SiO] n H, n≈3), the temperature was raised to 80°C, and 10g of potassium silanolate (KO[(CH 3 ) 2 SiO)] n K, n≈20), vigorously stir and vacuumize, so that the generated water is continuously distilled out, and the viscosity of the system gradually increases. After 2 hours of polymerization, the product is too viscous to stir, and it is kept for 2 hours. After cooling, a solid transparent Polymerization product. Add 1g of trimethylchlorosilane for neutralization and devolatilization to obtain fluorine-containing copolymerized silica gel with a molecular weight of about 650,000.

Embodiment 2

[0037] Add 5kg hydroxyl silicone oil (HO[(CH 3 ) 2 SiO] n H, n≈3), 5kg hydroxyfluorosilicone oil (HO[CH 3 (CH 2 CH 2 CF 3 )SiO] n H, n≈3) and 20g tetramethyltetravinylcyclotetrasiloxane [CH 3 (CH=CH 2 )SiO] 4 , the temperature was raised to 130°C, and 10g of sodium silanolate (NaO[(CH 3 ) 2 SiO)] nNa, n≈20), stirring vigorously and blowing air continuously, so that the produced water is continuously distilled out, and the viscosity of the system gradually increases. After 2 hours of polymerization, the product cannot be stirred because the viscosity is too high. Continue to keep it for 2 hours, and after cooling, a solid transparent the polymerization product. Add 1 g of trimethylchlorosilane for neutralization and devolatilization to obtain fluorine-containing copolymerized silica gel with a molecular weight of about 500,000.

Embodiment 3

[0039] Add 9kg hydroxyl silicone oil (HO[(CH 3 ) 2 SiO] n H, n≈3), 1kg tetramethyltetraphenylcyclotetrasiloxane [CH 3 (C 6 h 5 )SiO] 4 , and 20g of tetramethyltetravinylcyclotetrasiloxane [CH 3 (CH=CH 2 )SiO] 4 , the temperature was raised to 130°C, and 20g of sodium silanolate (NaO[(CH 3 ) 2 SiO)] n Na, n≈20), stirring vigorously and blowing air continuously, so that the produced water is continuously distilled out, and the viscosity of the system gradually increases. After 2 hours of polymerization, the product cannot be stirred because the viscosity is too high. Continue to keep it for 2 hours, and after cooling, a solid transparent the polymerization product. Add 2g of trimethylchlorosilane for neutralization and devolatilization to obtain a phenyl-containing copolysilica gel with a molecular weight of about 700,000.

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Abstract

The invention discloses a method for preparing an organic silicon copolymer. The method comprises the following steps: carrying out a non-equilibrium polycondensation method on two or more than two organic silicon molecules in the presence of a catalyst, thereby obtaining an organic silicon copolymer, wherein the two or more than two organic silicon molecules comprise at least one pair of hydroxyl-terminated straight chain organic silicon molecules, and the other or several organic silicon molecules are hydroxyl-terminated straight chain organic silicon molecules, alkoxyl-terminated straight chain organic silicon molecules, terminated hydrogen-containing straight chain organic silicon molecules or ring organic silicon molecules. With the adoption of the method, the organic silicon copolymer in which methyltrifluoropropyl siloxane units are uniformly distributed can be obtained, the molecular weight can be over 500000, and industrial production is conveniently realized. According to the method, phenyl siloxane rubber of different phenyl contents, copolymer nitrile silicone rubber having different nitrile group contents and copolymerized silica gel containing multiple functional units can be prepared.

Description

technical field [0001] The invention relates to polymers, in particular to a method for preparing organic silicon copolymers. Background technique [0002] Organosilicon polymers are the fastest growing branch in the field of elemental organic polymers. Among them, products with polydimethylsiloxane as the main component, such as dimethyl silicone rubber, methyl vinyl silicone rubber (commonly known as silica gel), etc., are known for their excellent high and low temperature resistance, weather resistance, aging resistance, electrical insulation, Hydrophobic, high resilience, physiological inertia and other characteristics are widely used in aerospace, electrical and electronic, chemical industry, machinery, transportation, medical and health, agriculture, daily life and other aspects, and become an important and indispensable new type in the national economy. Polymer Materials. With the rapid development of the silicone rubber industry, the research and development, produ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G77/24C08G77/06C08G77/08
Inventor 许祥郑安呐许治昕管涌危大福
Owner EAST CHINA UNIV OF SCI & TECH