WO2015096172A1

WO2015096172A1 - Room temperature-cured mono-component high-temperature-resistant silica gel and preparation method therefor

Info

Publication number: WO2015096172A1
Application number: PCT/CN2013/090838
Authority: WO
Inventors: 田志远
Original assignee: 袁志贤
Priority date: 2013-12-24
Filing date: 2013-12-30
Publication date: 2015-07-02
Also published as: CN103709759A

Abstract

Disclosed is a room temperature-cured mono-component high-temperature-resistant silica gel. The raw materials of a formulation therefor comprise hydroxyl-terminated polysiloxane, silicone oil, polymethyl triethoxy silane, a synthetic reinforcer, a reinforcing filler, a high-temperature-resistant filler, a cross-linking agent, a coupling agent and a catalyst. The silica gel is a room temperature-cured mono-component silica gel and is compounded using the synthetic reinforcer, the reinforcing filler and the high-temperature-resistant filler, has good high temperature resistance and good mechanical properties, and is mainly used for adhesively bonding and sealing materials such as ceramics, metals, stainless steel etc. under a high-temperature environment. Also provided is a preparation method for the room temperature-cured mono-component high-temperature-resistant silica gel. The present invention improves both the mechanical properties and the high temperature resistance of the organic silica gel, enriches the varieties of the organic silica gel, expands the application fields of the organic silica gel, and has a good application prospect.

Description

Room temperature curing type one-component high temperature resistant impurities and preparation thereof

Technical field

The present invention relates to a room temperature curing type one-component high temperature resistant silica gel and a process for the preparation thereof.

-Background technique

Room temperature curing type one-component high temperature resistant silica gel is a kind of high temperature resistant silica gel made of hydroxyl terminated polysiloxane. It contains no organic solvent, has small shrinkage, does not pollute the environment, can be cured at room temperature, and saves energy. Easy to use. However, the silicone rubber of the conventional processing method can only be used for a long time at 180-200 °C. When the temperature exceeds 200 °C, the hardness of the silicone rubber rises, and the crack loses elasticity and has no use value. However, under certain conditions, there is a high requirement for the high temperature resistance of silica gel. In the prior art, the ordinary high temperature resistant silica gel produced cannot withstand the high temperature of the engine sealing component above 200 ° C and the instant generated by ignition. High temperature, elastic recovery is not good enough, elasticity decreases at low temperatures, and long-term use is prone to elastic fatigue, which affects sealing performance.

Patent No. 200810091446. 4 [1] discloses an adhesive sealing material for an automobile engine and a chassis, and a one-component high temperature resistant sealant which can withstand a high temperature of 260 °C. Patent Application No. 201010560756. 3 [2] discloses a one-component high temperature silicone sealant which is resistant to high temperatures of 260 °C. Patent No. 201010551795. 7 [3] discloses a high temperature resistant silicone rubber and a method for preparing the same, which after being baked in an oven at 300 ° C for four hours, its tensile strength is reduced from l lMPa to 7 MPa, elongation The rate dropped from 628% to 340%, and the tear strength decreased from 26KN. M to 16KN. M, with a large drop. Application number is 201110348679. X patent [4] discloses a raw material formulation of high temperature resistant silicone rubber, which uses methyl vinyl silicone rubber as a base rubber and adds nano heat resistant additive to make it resistant to high temperatures below 400 °C.

At present, the heat resistance of silicone rubber is mainly improved by three methods: 1. The crosslinking and degradation caused by the oxidative decomposition of the organic side of the silicone rubber are suppressed by changing the structure of the side groups of the silicone rubber molecule, such as the introduction of phenyl group. Reaction [5] 2. Prevent the degradation of the silicone rubber main chain by oxidative depolymerization by introducing a large volume of a segment into the main chain of the silicone rubber molecule, such as carbon borazine; Agents, such as ferric oxide, rare earth elements, etc., inhibit side chain crosslinking of the silicone rubber. Among them, the addition of heat-resistant filler to silicone rubber is the most effective, economical and convenient method [6].

[1] One-component high temperature silicone sealant, application number: 200810091446. 4, Invention design: Chen Bingqiang; Liang Yinsheng; Chen Bingyao; Zhang Yitian;

[2] A one-component high temperature silicone sealant, application number: 201010560756. 3, Invention Designer: Chen Bingyao; Liang Yinqi; Zhang Qiuming;

[3] High temperature resistant silicone rubber and preparation method thereof, application number: 201010551795. 7, invention designer: Cai Enfu;

[4] A raw material formula for high temperature resistant silicone rubber, application number: 201110348679. X, invention Designer: Zhang Qing;

[5] Qiang Junfeng, Jing Xinli, Wang Yangyong, et al. Research progress in heat resistance of silicone rubber [J]. New Chemical Materials, 2003, 31 (10): 5-12;

[6] Peng Yazhen, Su Zhengtao, Liu Jun, et al. Effect of iron oxide red on heat aging properties of heat vulcanized silicone rubber [J]. Silicone Materials, 2005, 19 (4): 14-16. The object of the present invention is to make up for the deficiencies of the existing products, and provide a room temperature curing type one-component high temperature resistant silica gel and a preparation method thereof, which are mainly made by the compounding of a reinforcing reinforcing agent, a reinforcing filler and a high temperature auxiliary agent. The mechanical properties and high temperature resistance of silica gel are improved, the types of organic silica gel are enriched, and the application fields of organic silica gel are expanded, which has a good application prospect.

The technical solution of the present invention is:

A room temperature curing type one-component high temperature resistant silica gel, the formulation ratio of which is:

a hydroxyl terminated polysiloxane having 100 parts by weight;

Silicone oil 1 to 5 parts by weight;

Polymethyltriethoxysilane 5 to 20 parts by weight;

Synthetic reinforcing agent 10~20 parts by weight;

Reinforcing filler 10~20 parts by weight;

High temperature resistant filler 50~200 parts by weight;

Crosslinking agent 2~10 parts by weight;

Coupling agent 2~5 parts by weight;

Catalyst 0. 2~2 parts by weight.

Preferably, the hydroxyl-terminated polysiloxane is made of α, ω-dihydroxy polydimethylsiloxane; the silicone oil is phenyl silicone oil; the reinforcing filler is nano-montmorillonite; the high temperature resistant filler is black silicon carbide; The crosslinking agent is at least one of methyl tributyl ketone sulfonium silicon hydride and vinyl tributyl ketone sulfonium silicon hydride; the coupling agent is ruthenium - aminopropyl triethoxy silane; The agent is tin dibutyl dilaurate.

The preparation steps of the room temperature curing type one-component high temperature resistant silica gel as described above are as follows:

51, 100 parts by weight of hydroxy-terminated polysiloxane, 1 to 5 parts by weight of silicone oil, 5 to 20 parts by weight of polymethyltriethoxysilane, 10 to 20 parts by weight of synthetic reinforcing agent, reinforcing filler 10 〜20 parts by weight is added to the mixer, vacuumed, and the degree of vacuum is 0. IMPa, the number of rotations is 20 to 60 rpm and stirred for 60 minutes;

52, adding high temperature resistant filler 50~200 parts by weight, heated to 120 ° C, vacuum, vacuum 0. IMPa, number of rotations 20~60rpm for 120 minutes;

5 MPa, The number of rotations is 20~60rpm, stirring 10, 5~2 parts by weight, in a vacuum degree of 0. 1~0. After a minute, a room temperature curing type one-component high temperature resistant silica gel was obtained.

The preparation method of the above synthetic reinforcing agent is as follows: ethyl orthosilicate, polymethyltriethoxysilane, trimethylsilanol, ethanol, aqueous acetic acid in a weight ratio of 100: 20~100: 150~300 5〜下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下Prepared by pressure distillation.

The invention creates the advantages of overcoming the prior art, and mainly improves the mechanical properties and high temperature resistance of the organic silica gel by compounding the reinforcing agent, the reinforcing filler and the high temperature resistant auxiliary agent, enriching the type of the organic silica gel and expanding The application field of organic silica gel has a good application prospect, as follows:

1. Synthetic reinforcing agent is used to improve the mechanical properties of organic silica gel. On the one hand, after the macromolecules in the synthetic reinforcing agent are dispersed, a plurality of three-dimensional cross-linking centers are formed, and the cross-linking center and the high The polymer molecules have a strong interaction between the molecular chains. They are mutually adsorbed, and the chains and the chains are entangled with each other to form a dispersion, which effectively eliminates the interface energy difference between the two, and further improves the stress of the high-temperature glue of the present invention. On the other hand, since the cross-linking center itself is a polysiloxane structure, it has good stretching ability, increases the elongation at break of the system, and also delays the fracture process of the composite system, thereby increasing the present invention. The elongation at break of the high temperature resistant glue; thus achieving the reinforcing effect.

2. Nano-montmorillonite is used to replace traditional silica as a reinforcing filler to improve the mechanical properties of organic silica gel. Nano-montmorillonite is mainly used in rubber for nano-modification of rubber products to improve its air tightness, tensile and abrasion resistance, corrosion resistance, weather resistance and chemical resistance. By adding an appropriate amount of nano-montmorillonite, the strength and elongation of the rubber can be greatly improved, and some properties can be improved several times, which can replace the current white carbon black. There are three reasons for using nano-montmorillonite instead of silica as a reinforcing filler:

(1) The surface of silica has a highly active hydroxyl group, which causes Si-0 to break at high temperature, causing degradation of the main chain;

(2) The adsorbed water remaining on the surface of silica can also hydrolyze the Si-0 at high temperature, resulting in poor thermal stability of the silicone rubber at high temperatures, and the use temperature is not high;

(3) Silica is difficult to infiltrate and disperse in the organic phase.

3. Since polymethyltriethoxysilane has hydrophobicity and high heat resistance, adding appropriate amount of polymethyltriethoxysilane as a high temperature auxiliary agent in silica gel can improve the resistance of organic silica gel. High temperature performance.

4. High phenyl silicone oil has high thermal stability and good radiation resistance. It can be used as heat treatment bath for metal products, high temperature heating oil, gas chromatography carrier, electronic and electrical equipment. High and low temperature lubricants, high temperature greases made of carbon black, lithium soap or molybdenum disulfide can be used for lubrication of high temperature fan bearings, ball bearings, automotive engines, textile dryers, etc. Adding an appropriate amount of high phenyl silicone oil as a high temperature resistant additive to the silica gel can improve the high temperature resistance of the organic silica gel.

5. Silicon carbide has properties such as corrosion resistance, high temperature resistance, high strength, good thermal conductivity, good impact resistance, good wear resistance and low friction coefficient. It is an ideal material for the manufacture of high temperature resistant materials and high performance sealing devices. By adding a certain amount of silicon carbide as a high temperature resistant filler to the silica gel, the high temperature resistance of the organic silica gel can be improved. DRAWINGS

1 is a production material diagram of a preferred embodiment of the present invention;

The invention provides a room temperature curing type one-component high temperature resistant silica gel, and the formulation ratio thereof is: 100 parts by weight of hydroxyl terminated polysiloxane;

Silicone oil 1 to 5 parts by weight;

Polymethyltriethoxysilane 5 to 20 parts by weight;

Synthetic reinforcing agent 10~20 parts by weight;

Reinforcing filler 10~20 parts by weight;

High temperature resistant filler 50~200 parts by weight;

Crosslinking agent 2~10 parts by weight;

2 to 5 parts by weight of the coupling agent; 2〜2重量份。 Catalyst 0. 2~2 parts by weight.

Preferably, the hydroxyl-terminated polysiloxane is made of α, ω-dihydroxy polydimethylsiloxane; the silicone oil is phenyl silicone oil; the reinforcing filler is nano-montmorillonite; the high temperature resistant filler is black silicon carbide; The crosslinking agent is at least one of methyl tributyl ketone sulfonium silicon hydride and vinyl tributyl ketone sulfonium silicon hydride; the coupling agent is ruthenium - aminopropyl triethoxy silicon germanium; Based on tin lauric acid.

The preparation method of the room temperature curing type one-component high temperature resistant silica gel as described above, the preparation steps are as follows:

The preparation method of the synthetic reinforcing agent is as follows: ethyl orthosilicate, polymethyltriethoxysilane, trimethylsilanol, ethanol, acetic acid aqueous solution in a weight ratio of 100: 20~100: 150~ 5〜下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下下It is obtained by distillation under reduced pressure. The invention mainly improves the mechanical properties and high temperature resistance of the organic silica gel by the compounding of the synthetic reinforcing agent, the reinforcing filler and the high temperature resistant auxiliary agent, as follows:

1. Synthetic reinforcing agent is used to improve the mechanical properties of organic silica gel. On the one hand, after the macromolecules in the synthetic reinforcing agent are dispersed, a plurality of three-dimensional cross-linking centers are formed, and the cross-linking center and the polymer molecular chain have a strong interaction, and they are mutually adsorbed, and the chains and the chains are intertwined with each other. , exhibiting dispersion, effectively eliminating the interface energy difference between the two, further improving the stress tolerance of the high temperature adhesive of the invention; on the other hand, since the crosslinking center itself is a polysiloxane structure, has good The expansion ability increases the elongation at break of the system, and also delays the fracture process of the composite system, and increases the elongation at break of the high temperature resistant glue of the present invention; thereby achieving the reinforcing effect.

(3) Silica is difficult to infiltrate and disperse in the organic phase.

3. Since polymethyltriethoxysilane has hydrophobicity and high heat resistance, it is in silica gel. Adding an appropriate amount of polymethyltriethoxysilane as a high temperature resistant additive can improve the high temperature resistance of the organic silica gel.

4. High phenyl silicone oil has high thermal stability and good radiation resistance. It can be used as heat treatment bath for metal products, high temperature heating oil, gas chromatography carrier, high and low temperature lubricating oil for electronic and electrical equipment, adding carbon black. High-temperature grease made of lithium soap or molybdenum disulfide can be used for lubrication of high-temperature fan bearings, ball bearings, automobile engines, textile dryers, etc. Adding an appropriate amount of high phenyl silicone oil to the silica gel as a high temperature resistant additive can improve the high temperature resistance of the organic silica gel.

5. Silicon carbide has properties such as corrosion resistance, high temperature resistance, high strength, good thermal conductivity, good impact resistance, good wear resistance and low friction coefficient. It is an ideal material for the manufacture of high temperature resistant materials and high performance sealing devices. By adding a certain amount of silicon carbide as a high temperature resistant filler to the silica gel, the high temperature resistance of the organic silica gel can be improved.

The invention is illustrated by the following examples, but the invention is not limited to the examples, and the number of parts in the examples is by weight.

Example 1

1. 100 parts by weight of α, ω-dihydroxypolydimethylsiloxane, 2 parts by weight of phenyl silicone oil, 12 parts by weight of polymethyltriethoxysilane, 12 parts by weight of synthetic reinforcing agent, nanometer 15 parts by weight of earth-free soil was added to the mixer, vacuum was applied, and the degree of vacuum was 0. IMPa, stirring at 40 rpm for 60 minutes;

2. Add 140 parts by weight of black silicon carbide, heat to 120 ° C, vacuum, vacuum degree of 0.1 MPa, stirring at 40 rpm for 120 minutes;

3. Adding 4 parts by weight of vinyl tributolone decyl silane, methyl tributythanone fluorenyl silane 3 Parts by weight, Y-aminopropyltriethoxysilyl 4 parts by weight, dibutyltin dilaurate 0. 4 parts by weight, stirred at a vacuum of 0. lMPa, 40 rpm for 10 minutes to obtain room temperature curing One-component high temperature resistant silicone.

Example 2:

1. 100 parts by weight of α, ω-dihydroxypolydimethylsiloxane, 3 parts by weight of phenyl silicone oil, 10 parts by weight of polymethyltriethoxysilane, 15 parts by weight of synthetic reinforcing agent, nanometer 12 parts by weight of earth-free soil was added to the mixer, vacuum was applied, and the degree of vacuum was 0. IMPa, stirring at 40 rpm for 60 minutes;

2. Add 100 parts by weight of black silicon carbide, heat to 120 ° C, vacuum, vacuum degree of 0.1 MPa, stirring at 40 rpm for 120 minutes;

3. 3 parts by weight of vinyl tributyl ketone decyl silane, 4 parts by weight of methyl tributythanone fluorenyl silane, 3 parts by weight of Y - aminopropyl triethoxy siloxane, dibutyl dilaurate Tin. 0 parts by weight, stirred at a vacuum of 0. IMPa, 40 rpm for 10 minutes to obtain a room temperature curing type one-component high temperature resistant silica gel.

Example 3:

1. 100 parts by weight of α, ω-dihydroxypolydimethylsiloxane, 2.5 parts by weight of phenyl silicone oil, 16 parts by weight of polymethyltriethoxysilane, 13 parts by weight of synthetic reinforcing agent, 14 parts by weight of nano montmorillonite was added to the mixer, vacuuming, vacuum degree 0. IMPa, stirring at 40 rpm for 60 minutes;

2. Add 110 parts by weight of black silicon carbide, heat to 120 ° C, vacuum, vacuum degree of 0.1 MPa, stirring at 40 rpm for 120 minutes;

3. Adding 5 parts by weight of vinyl tributyl ketone decyl silane, methyl tributythanone fluorenyl silane 3 重量重量为,份份份份份份份份份份份份份份份份份份份份。 Room temperature curing type one component high temperature resistant silica gel.

Example 4:

1. 100 parts by weight of α, ω-dihydroxypolydimethylsiloxane, 4 parts by weight of phenyl silicone oil, 9 parts by weight of polymethyltriethoxysilane, 10 parts by weight of synthetic reinforcing agent, nanometer 17 parts by weight of earth-free soil was added to the mixer, vacuum was applied, and the degree of vacuum was 0. IMPa, stirring at 40 rpm for 60 minutes;

2. Add 90 parts by weight of black silicon carbide, heat to 120 ° C, vacuum, vacuum degree of 0.1 MPa, stirring at 40 rpm for 120 minutes;

5重量份,二乙二二。 Adding vinyl tributol oxime siloxane bismuth 2 parts by weight, methyl tributanone fluorenyl silane oxime 5 parts by weight, Y - aminopropyl triethoxy silicon ruthenium 3. 5 parts by weight, dibutyl 0.5 parts by weight of lauric acid, stirred at a vacuum of 0. IMPa, 40 rpm for 10 minutes to obtain a room temperature curing type one-component high temperature resistant silica gel.

Example 5

1. 100 parts by weight of α, ω-dihydroxypolydimethylsiloxane, 1.5 parts by weight of phenyl silicone oil, 17 parts by weight of polymethyltriethoxysilane, 14 parts by weight of synthetic reinforcing agent, 13 parts by weight of nano montmorillonite was added to the mixer, vacuuming, vacuum degree 0. IMPa, stirring at 40 rpm for 60 minutes;

2. Add 160 parts by weight of black silicon carbide, heat to 120 ° C, vacuum, vacuum degree of 0.1 MPa, stirring at 40 rpm for 120 minutes;

5. Adding vinyl tributyl ketone decyl silicon germanium 2. 5 parts by weight, methyl tributol ketone sulfonium silicon germanium 2. 5 parts by weight, 2 parts by weight of Y-aminopropyltriethoxysilane, 1 part by weight of dibutyltin laurate, and stirred at a vacuum of 0.1 MPa, 40 rpm for 10 minutes to obtain room temperature Curable one-component high temperature silicone.

Example 6:

1. 100 parts by weight of α, ω-dihydroxypolydimethylsiloxane, 2 parts by weight of phenyl silicone oil, 14 parts by weight of polymethyltriethoxysilane, 11 parts by weight of synthetic reinforcing agent, nanometer 16 parts by weight of earth-free soil was added to the mixer, vacuum was applied, and the degree of vacuum was 0. IMPa, stirring at 40 rpm for 60 minutes;

2. Add 120 parts by weight of black silicon carbide, heat to 120 ° C, vacuum, vacuum degree of 0.1 MPa, stirring at 40 rpm for 120 minutes;

3重量份,二乙二。 Adding 3 parts by weight of vinyl tributyl ketone fluorenyl silane, 2 parts by weight of methyl tributanone fluorenyl silane, Y - aminopropyl triethoxy siloxane 2.8 parts by weight, dibutyl The lauric acid tin was 0.4 parts by weight, and the mixture was stirred at a vacuum of 0.1 g and a number of revolutions of 40 rpm for 10 minutes to obtain a room temperature-curing one-component high-temperature resistant silica gel.

Example 7

1. 100 parts by weight of α, ω-dihydroxypolydimethylsiloxane, 3.5 parts by weight of phenyl silicone oil, 8 parts by weight of polymethyltriethoxysilane, 16 parts by weight of synthetic reinforcing agent, 11 parts by weight of nano montmorillonite was added to the mixer, vacuumed, and the degree of vacuum was 0. IMPa, stirring at 40 rpm for 60 minutes;

2. Add 80 parts by weight of black silicon carbide, heat to 120 ° C, vacuum, vacuum degree 0.1 MPa, stirring at 40 rpm for 120 minutes;

3. Adding 2 parts by weight of vinyl tributolone fluorenyl silane, methyl tributythanone fluorenyl silane 3 Parts by weight, Y-aminopropyltriethoxysilyl 5 parts by weight, dibutyltin dilaurate 0. 2 parts by weight, stirred at a vacuum of 0. lMPa, 40 rpm for 10 minutes to obtain room temperature curing One-component high temperature resistant silicone.

Example 8

1. 100 parts by weight of α, ω-dihydroxypolydimethylsiloxane, 3 parts by weight of phenyl silicone oil, 15 parts by weight of polymethyltriethoxysilane, 10 parts by weight of synthetic reinforcing agent, nanometer 18 parts by weight of earth-free soil was added to the mixer, vacuum was applied, and the degree of vacuum was 0. IMPa, stirring at 40 rpm for 60 minutes;

2. Add 150 parts by weight of black silicon carbide, heat to 120 ° C, evacuate, vacuum 0. IMPa, stir at 40 rpm for 120 minutes;

3. Adding 4 parts by weight of vinyl tributolone fluorenyl silane, methyl tributythanone fluorenyl silane 4, 5 parts by weight, 4 parts by weight of Y-aminopropyltriethoxysilane, dibutyl bis 0.3 parts by weight of lauric acid, stirred at a vacuum of 0.1 MPa and a number of revolutions of 40 rpm for 10 minutes to obtain a room temperature-curing one-component high-temperature resistant silica gel.

Example 9

1. 100 parts by weight of α, ω-dihydroxypolydimethylsiloxane, 1 part by weight of phenyl silicone oil, 5 parts by weight of polymethyltriethoxysilane, 18 parts by weight of synthetic reinforcing agent, nanometer 10 parts by weight of earth-free soil was added to the mixer, vacuum was applied, and the degree of vacuum was 0. IMPa, stirring at 40 rpm for 60 minutes;

2. Add 50 parts by weight of black silicon carbide, heat to 120 ° C, evacuate, vacuum 0. IMPa, stir at 40 rpm for 120 minutes;

3. Add 1 part by weight of vinyl tributolone decyl silane, methyl tributythanone fluorenyl silane 1 重量份份,份份份份份份份份份份份份份份份份份份份份份份份份份份份份份份份份份份份份份份份份份份份份份份份份份份份份份份份份份份份份份份份份份份份份份份份份份份份份份份份份份份份份份Room temperature curing type one component high temperature resistant silica gel.

Example 10

1. 100 parts by weight of α, ω-dihydroxypolydimethylsiloxane, 5 parts by weight of phenyl silicone oil, 20 parts by weight of polymethyltriethoxysilane, 20 parts by weight of synthetic reinforcing agent, nanometer 20 parts by weight of earth-free soil was added to the mixer, vacuum was applied, and the degree of vacuum was 0. IMPa, stirring at 40 rpm for 60 minutes;

2. Add 200 parts by weight of black silicon carbide, heat to 120 ° C, evacuate, vacuum 0. IMPa, stir at 40 rpm for 120 minutes;

3. 4 parts by weight of vinyl tributyl ketone decyl silane, 6 parts by weight of methyl tributythanone fluorenyl silane, 5 parts by weight of Y - aminopropyl triethoxy siloxane, dibutyl dilaurate 2 parts by weight of tin was stirred at a vacuum of 0. IMPa at a number of revolutions of 40 rpm for 10 minutes to obtain a room temperature-curing one-component high-temperature resistant silica gel.

The above is a detailed description of a room temperature curing type one-component high temperature resistant silica gel and a preparation method thereof provided by the present invention. For those skilled in the art, according to the idea of creating an embodiment of the present invention, in the specific embodiment There is a change in the scope of the application, and the contents of the present specification should not be construed as limiting the creation of the invention.

Claims

Claim

1. A room temperature curing type one-component high temperature resistant silica gel, characterized in that: the formulation ratio is:

a hydroxyl terminated polysiloxane having 100 parts by weight;

Silicone oil 1 to 5 parts by weight;

Polymethyltriethoxysilane 5 to 20 parts by weight;

Synthetic reinforcing agent 10~20 parts by weight;

Reinforcing filler 10~20 parts by weight;

High temperature resistant filler 50~200 parts by weight;

Crosslinking agent 2~10 parts by weight;

Coupling agent 2~5 parts by weight;

Catalyst 0. 2~2 parts by weight.

The room temperature-curing one-component high-temperature resistant silica gel according to claim 1, wherein the hydroxy-terminated polysiloxane is α,ω-dihydroxypolydimethylsiloxane.

The room temperature-curing one-component high-temperature resistant silica gel according to claim 1, wherein the silicone oil is phenyl silicone oil.

4. The room temperature curing type one-component high temperature resistant silica gel according to claim 1, wherein: the reinforcing filler is nano montmorillonite, and the nano montmorillonite is used instead of the conventional white carbon black as a reinforcing filler. Improve the mechanical properties of organic silica gel, nano montmorillonite can improve its air tightness, tensile and tensile properties and wear resistance, corrosion resistance, weather resistance, chemical resistance, rubber strength can be achieved by adding appropriate amount of nano montmorillonite The performance such as elongation is greatly improved, and some performance can be improved several times. The room temperature curing type one-component high temperature resistant silica gel according to claim 1, wherein the high temperature resistant filler is black silicon carbide.

The room temperature curing type one-component high temperature resistant silica gel according to claim 1, wherein the crosslinking agent is methyl tributythanone fluorenyl silane or vinyl tributyl ketone fluorenyl silane. At least one of them.

The room temperature-curing one-component high temperature resistant silica gel according to claim 1, wherein the coupling agent is Y-aminopropyltriethoxysilane.

The room temperature-curing one-component high-temperature resistant silica gel according to claim 1, wherein the catalyst is dibutyltin dilaurate.

The method for preparing a room temperature curing type one-component high temperature resistant silica gel according to any one of claims 1 to 8, wherein the step of preparing the room temperature curing type one component high temperature resistant silica gel is as follows:

10. The preparation method of the room temperature curing type one-component high temperature resistant silica gel according to claim 9. The method for preparing the synthetic reinforcing agent is as follows: ethyl orthosilicate, polymethyltriethoxysilane, trimethylsilanol, ethanol, and aqueous acetic acid are used in a weight ratio

100: 20~100: 150~300: 60~80: 5~15, the mixture is uniformly mixed at 40~60 ° C for 3 to 4 hours, and the mixture after the reaction is at 40 to 60 ° C, -0. It is obtained by distillation under reduced pressure at a temperature of ~ -0. 5 MPa.