Preparation method for fluorosilicone rubber

A technology of fluorosilicone rubber and fluorosilane, which is applied in the field of preparation of fluorosilicone rubber, can solve the problems that curing is greatly affected by air humidity and slow curing speed, and achieves the effects of improving dispersion stability and increasing water loss.

Inactive Publication Date: 2018-11-30
FOSHAN GAOMING DISTRICT ZHUAHE NEW MATERIAL TECH CO LTD
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AI Technical Summary

Problems solved by technology

[0006] The technical problem mainly solved by the present invention is aimed at the liquid fluorosilicone rubber that is mainly terminated by hydroxyl groups in the current rubber market, and uses the activity of the Si-OH bond to undergo condensation reactions with groups containing hydroxyl groups, methoxyl groups, and ethoxyl groups. curing, the curing speed is relatively slow, and the curing is greatly affected by the air humidity, and a preparation method of fluorosilicone rubber is provided

Method used

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Embodiment Construction

[0024]Mix 200-220mL of absolute ethanol with 100-120mL of 2% perfluorooctyltriethoxysilane aqueous solution to obtain a siloxane solution, and adjust the pH of the siloxane solution to 3.0 to 3.3, pour the siloxane solution into a beaker, stir and mix with a magnetic stirrer at a speed of 300 to 320r / min for 22 to 24 hours to obtain a hydrolyzed fluorosilane solution; The waste tea leaves were crushed through a 100-mesh sieve to obtain waste tea powder. Take 100-120 parts of waste tea powder and 20-25 parts of sodium methyl siliconate in a beaker, dehydrate in a boiling water bath at 98-100°C for 1-3 hours, and then add 10-15 parts of tetramethyltetravinylcyclotetrasiloxane, mixed and dehydrated for 1-2 hours, heated to 115-150°C for 4-5 hours, then cooled to 60-70°C, added 20-25 parts of ethyl acetate Stir and dissolve the ester, then wash with water until the pH value is 6.8-7.0, evaporate the solvent to obtain the fluorosilicone additive; prepare a titanium dioxide ethanol ...

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Abstract

The invention discloses a preparation method for a fluorosilicone rubber, belonging to the technical field of preparation of rubber materials. According to the invention, surface-modified titanium dioxide nanoparticles are obtained through mixing and high-speed dispersion of hydrolyzed fluorosilane and titanium dioxide; during preparation of a moisture-cured vinyl auxiliary agent, an intermediateis a polyamide epichlorohydrin resin intermediate; during generation of a polyamide epichlorohydrin resin emulsion by polymerization and curing of vinyl resin, the polyamide epichlorohydrin resin emulsion forms a covering film on the surface of the vinyl resin; fluorosilane molecules are hydrolyzed under an acidic condition, and hydrolyzed fluorosilane molecules are adsorbed onto the surface of titanium dioxide nanoparticles due to a hydrogen bond action, so the titanium dioxide nanoparticles can obtain good dispersity in an organic matrix; the coating layer on the surface of fluorosilane reduces the van der Waals force and the hydrogen bond action of the titanium dioxide nanoparticles on water, so the surface of the fluorosilicone rubber does not absorb the water after being cured, and the effect of curing is enhanced; thus, the fluorosilicone rubber provided by the invention has broad application prospects.

Description

technical field [0001] The invention discloses a preparation method of fluorosilicone rubber, which belongs to the technical field of rubber material preparation. Background technique [0002] Fluorosilicone rubber is a new type of special rubber. Fluorosilicone rubber has the advantages of both silicone rubber and fluororubber. Due to the introduction of trifluoropropyl groups in its molecular structure, it has far superior oil resistance and resistance to heat than ordinary silicone rubber. Solvent properties, but also has excellent heat resistance, cold resistance and weather resistance of silicone rubber, can be used as diaphragms, gaskets and seals in automobiles and aircraft. And because of its long synthetic route, complex process and high technical requirements. Currently produced in only a few countries. [0003] Silicone materials have the characteristics of superior high and low temperature resistance, superior physical and mechanical properties at high temperat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/16C08L83/08C08L77/06C08L63/00C08K3/04C08K9/06C08K3/22C08K3/36
CPCC08L27/16C08K2003/2241C08K2201/011C08L2205/035C08L83/08C08L77/06C08L63/00C08K3/041C08K9/06C08K3/22C08K3/36
Inventor 胡次兵路芸卢星
Owner FOSHAN GAOMING DISTRICT ZHUAHE NEW MATERIAL TECH CO LTD
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