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Fluorosilicone rubber composition, preparation method therefor and sealants and coating materials prepared from composition

A technology of fluorosilicone rubber and composition, applied in the field of fluorosilicone rubber, can solve the problems of polluted air, complicated operation, increased oil resistance effect, etc., and achieve the effects of excellent mechanical properties, oil resistance and convenient use.

Inactive Publication Date: 2019-06-07
SHENZHEN GUANHENG NEW MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The operation is more complicated and there is polluted air
[0005] US5599893 shows that in order to improve the oil resistance of room temperature adhesives, nonafluorohexylmethyldimethoxysilane is added in order to increase oil resistance, but the increase in oil resistance is not obvious

Method used

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  • Fluorosilicone rubber composition, preparation method therefor and sealants and coating materials prepared from composition
  • Fluorosilicone rubber composition, preparation method therefor and sealants and coating materials prepared from composition
  • Fluorosilicone rubber composition, preparation method therefor and sealants and coating materials prepared from composition

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Embodiment approach

[0039] According to some preferred embodiments of the present invention, the hydroxyl-terminated fluorosilicone base rubber has the following structural formula:

[0040]

[0041] Among them, R 1 =-(CH 2 ) 2 (CF 2 ) p1 CF 3 , p1 is an integer of 0-7, preferably, the p1 is 0 or 3;

[0042] R 2 = Me, Et or Ph, preferably Me;

[0043] m 1 is an integer between 100 and 1000, preferably 200-750, more preferably 300-600, n 1 It is an integer between 0 and 500, preferably 0-300.

[0044] Preferably, the hydroxyl-terminated fluorosilicone base rubber has a viscosity of 5000mpa.s to 90000mpa.s, more preferably 20000mpa.s to 90000mpa.s.

[0045] According to other preferred embodiments of the present invention, the filler comprises fluorine-containing silane-modified white carbon black.

[0046] Preferably, the filler further includes one or more selected from titanium dioxide, silicon micropowder, and calcium carbonate.

[0047] The size of the filler is nanoscale. Nano...

example 1

[0080] Under the protection of nitrogen, add 400g of hydroxyl-terminated fluorosilicone base rubber with a viscosity of 90000mpa.s into the planetary mixer, add 24g of modified white carbon black and 40g of nano-calcium carbonate, and start the planetary mixer. After stirring evenly, add 15g of molecular weight modifier. Stir evenly, then heat up the planetary mixer to 120° C., and stir for 3 hours at a vacuum of 50 Pa. Circulating water was introduced, the temperature was lowered to 60° C., and under the protection of nitrogen, 12 g of di-tert-butoxydiacetoxysilane, 30 g of methyltriacetoxysilane and 4 g of dibutyltin diacetate were added. Mix and stir until smooth. Stand still for 1 hour to obtain RTV-01.

[0081] The hydroxyl-terminated fluorosilicone base glue used is:

[0082]

[0083] Among them, R 1 =-(CH 2 ) 2 (CF 2 ) p1 CF 3 , p1 is 0, R 2 = methyl, m 1 700-750, n 1 is 0.

example 2

[0085] Under the protection of nitrogen, add 400g of hydroxyl-terminated fluorosilicone base rubber with a viscosity of 65000mpa.s into the planetary mixer, add 12g of modified white carbon black and 30g of silicon micropowder, and start the planetary mixer. After stirring evenly, add 18g leveling agent. Stir evenly, then heat up the planetary mixer to 130° C., and stir for 2 hours at a vacuum of 50 Pa. Circulating water was introduced, the temperature was lowered to 60° C., and under the protection of nitrogen, 15 g of di-tert-butoxydiacetoxysilane, 30 g of methylethyltriacetoxysilane and 2 g of dibutyltin diacetate were added. Mix and stir until smooth. Stand still for 1 hour to obtain RTV-02.

[0086] The hydroxyl-terminated fluorosilicone base glue used is:

[0087]

[0088] Among them, R 1 =-(CH 2 ) 2 (CF 2 ) p1 CF 3 , p1 is 3, R 2 = methyl, m 1 240-260, n 1 is 0.

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Abstract

The invention provides a fluorosilicone rubber composition and a preparation method therefor. The composition comprises hydroxyl-terminated fluorosilicone basic rubber, a filler, a cross-linker, a silane coupler and a catalyst which are in a specific content; and further, the composition may comprise a molecular weight regulator and a leveling agent. The composition can be vulcanized in atmospheric and room-temperature environments to form sealants which are applied to the field of oil-resistant seal, and the sealants have excellent mechanical properties, oil resistance and chemical resistance. The composition can also be dissolved in a solvent to form coating materials. The coating materials can be coated on surfaces of oil-contact or chemical-contact reagents in a spraying or brushing manner so as to protect the surfaces from corrosion.

Description

technical field [0001] The invention relates to the field of fluorosilicone rubber, in particular to a fluorosilicone rubber composition, a preparation method thereof, and sealants and coatings prepared from the composition. Background technique [0002] Silicone rubber is divided into mixed silicone rubber and liquid silicone rubber according to the commodity form. Mixed silicone rubber, usually also called heat vulcanized silicone rubber, is made of polyorganosiloxane with high polymerization degree, reinforcing filler, filler and various additives, through kneading, roller plasticization, compounding vulcanizing agent and other processes. into rubber compound, which is then pressed into tablets, high-temperature vulcanized molding and other processes to finally form rubber products. Liquid silicone rubber is made of silicone oil with a medium degree of polymerization (100-1000) and various additives to form a self-leveling or thixotropic base material. When used, it can ...

Claims

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Application Information

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IPC IPC(8): C08L83/08C08K13/06C08K9/06C08K3/36C08K5/544C09J183/08C09J11/08C09J11/06C09J11/04C09D183/08
Inventor 陈秀杰杨冲
Owner SHENZHEN GUANHENG NEW MATERIALS TECH
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