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Preparation method of non-linear structure organosilicon polymer

A silicone, polymer technology, applied in the polymer field

Active Publication Date: 2017-06-06
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 non-linear structure organosilicon polymer
  • Preparation method of non-linear structure organosilicon polymer
  • Preparation method of non-linear structure organosilicon polymer

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 a non-linear structure silicone polymer, which is to obtain a non-linear structure silicone polymer through polymerization reaction of a cyclic organic silicon monomer, a multi-active anion initiator, a molecular weight control agent and a vinyl monomer. The multi-active anion initiator is prepared by reacting cyclic organosilicon monomer, alkali and alkoxysilane. The invention provides a preparation method of an anionic initiator with multiple active species, and uses the initiator to initiate ring-opening polymerization of organosilicon ring monomers to prepare organosilicon polymers with a nonlinear structure. These silicone polymers have greater melt elasticity and higher viscosity than linear polymers, resulting in compounds with better resilience and low compression set.

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 Patents(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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