Transparent high-strength self-leveling methanol-removed single-component organic silica gel and preparation method thereof

A silicone, high-strength technology, applied in the direction of adhesives, polymer adhesive additives, non-polymer adhesive additives, etc., can solve the problems of non-self-leveling, non-protruding high strength, yellowing of rubber materials, etc. , to achieve the effect of solving storage stability, excellent transparency, and eliminating thixotropic performance

Active Publication Date: 2016-12-07
GUANGZHOU MECHANICAL ENG RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In the technical solutions for the preparation of demethanolized transparent adhesives provided by the relevant domestic patents and literatures inquired above, the prepared sealants are all thixotropic pastes, which do not have self-leveling properties, which limits their use in certain occasions. related patents and documents do not highlight the technical characteristics of high strength. In most embodiments, the tensile strength after complete curing is less than 2MPa, which also limits the application in certain fields of industrial transparent adhesives; some There are certain technical weaknesses in the technical solution. For example, the patent CN103725009B mentions the use of hexamethyldisilazane as a stabilizer, which will release ammonia with a pungent smell and cause serious yellowing of the rubber compound.

Method used

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  • Transparent high-strength self-leveling methanol-removed single-component organic silica gel and preparation method thereof
  • Transparent high-strength self-leveling methanol-removed single-component organic silica gel and preparation method thereof

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preparation example Construction

[0044] The preparation method of a transparent high-strength self-leveling demethanol type one-component organic silica gel comprises the following steps:

[0045] 1) Add alkoxy-terminated polydimethylsiloxane, reinforcing filler, plasticizer, and hydroxyl scavenger into a planetary mixer, and stir and mix under vacuum;

[0046] 2) Add a crosslinking agent in the mixture obtained in the previous step, and disperse and stir under vacuum;

[0047] 3) Add coupling agent and catalyst, disperse and stir under vacuum to prepare transparent high-strength self-leveling demethanolized silica gel.

[0048] Preferably, in step 1), the vacuum degree is 0.075-0.095MPa, the rotation speed is 600-800rpm, and the stirring time is 20-120min; further preferably, in step 1), the vacuum degree is 0.08-0.09 MPa, the rotating speed is 650~750rpm, and the stirring time is 40~60min.

[0049] Preferably, in step 2), the vacuum degree is 0.075-0.095MPa, the rotation speed is 300-500rpm, and the stirrin...

Embodiment 1

[0053] (1) In the planetary stirring tank, add 100 parts by mass of polydimethylsiloxane with a viscosity of 1500mPa·s at 25°C and a polydimethylsiloxane with a viscosity of 100mPa·s. Base silicone oil 10 mass parts, specific surface area 220m 2 20 mass parts of hydrophilic fumed silica / g, 3 mass parts of vinyltriisopropenyloxysilane, stirred and dispersed at 700 rpm for 50 min under a vacuum of 0.085 MPa;

[0054] (2) Add 13 parts by mass of tetramethoxysilane oligomer, stir and disperse at 400 rpm for 30 min under a vacuum of 0.085 MPa;

[0055] (3) Add 1.5 parts by mass of γ-(2,3-epoxy, propoxy)propyltrimethoxysilane, 1.5 parts by mass of γ-aminopropyltrimethoxysilane, and 0.5 parts by mass of stannous octoate, at 0.085MPa Stir and disperse at 400rpm under vacuum for 40min;

[0056] (4) Discharge sealed package, test.

Embodiment 2

[0063] (1) In the planetary stirring tank, add 100 parts by mass of polydimethylsiloxane with a viscosity of 5000 mPa·s at 25 °C and a specific surface area of ​​400 mPa. 2 10 mass parts of hydrophilic fumed silica / g, 7 mass parts of vinyltriisopropenyloxysilane, stirred and dispersed at 700 rpm for 50 min under a vacuum of 0.085 MPa;

[0064] (2) Add 10 parts by mass of tetramethoxysilane oligomer, stir and disperse at 400 rpm for 30 min under a vacuum of 0.085 MPa;

[0065] (3) Add 2.5 parts by mass of γ-(2,3-epoxy, propoxy)propyltrimethoxysilane, 1.5 parts by mass of γ-aminopropyltrimethoxysilane, 3-mercaptopropyltrimethoxysilane Parts by mass, 1.5 parts by mass of dibutyltin dilaurate, stirred and dispersed at 400rpm for 40min under a vacuum of 0.085MPa;

[0066] (4) Discharge sealed package, test.

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Abstract

The invention discloses a transparent high-strength self-leveling methanol-removed single-component organic silica gel which is composed of the following raw materials in parts by weight: 100 parts of alkoxy-terminated polydimethylsiloxane, 0-30 parts of plasticizer, 10-17 parts of crosslinking agent, 3-7 parts of coupling agent, 10-20 parts of reinforcing filler, 0.5-2 parts of catalyst and 3-9 parts of hydroxy remover. The preparation method of the organic silica gel comprises the following steps: 1) adding the alkoxy-terminated polydimethylsiloxane, reinforcing filler, plasticizer and hydroxy remover into a planet stirrer, and stirring and mixing in a vacuum; 2) adding the crosslinking agent into the mixture obtained in the step (1), and dispersing and stirring in a vacuum; and 3) adding the coupling agent and catalyst, and dispersing and stirring in a vacuum. The organic silica gel product is neutral-curing, has the advantages of favorable yellowing resistance, no corrosivity to the substrate, high storage stability, excellent transparency and higher strength, and can implement self-leveling to satisfy the diversified demands of industrial gels.

Description

technical field [0001] The invention relates to a transparent high-strength self-leveling demethanol type one-component organic silica gel and a preparation method thereof. Background technique [0002] After vulcanization, organosilicone sealants have excellent cold resistance, heat resistance, weather resistance and electrical insulation properties, and are widely used in aerospace, construction, automobile and electronics fields. [0003] Transparent dealcoholized silica gel, without the irritating smell of acidic transparent glue, compared with ketoxime silica gel, the neutral small molecules released are more friendly to the environment, and will not corrode copper metal, PC and other materials, so there is Relatively wider application. [0004] Due to high technical and production process requirements, there are not many mature transparent demethanol type silica gel products in China. What can be seen on the market is mainly the sub-package products of imported vat ru...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J183/06C09J11/08C09J11/06C09J11/04
CPCC08L2201/10C08L2205/025C08L2205/03C09J11/04C09J11/06C09J11/08C09J183/06C08L83/04C08K13/02C08K3/36C08K5/5425C08K5/5435C08K5/544C08K5/548C08K5/5419
Inventor 孙明辉李吉明刘海涛钟汉荣
Owner GUANGZHOU MECHANICAL ENG RES INST
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