A transparent high-strength self-leveling demethanol type one-component organic silica gel and its preparation method

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 high hydroxyl removal efficiency, excellent transparency, and elimination of thixotropy

Active Publication Date: 2019-02-05
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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  • A transparent high-strength self-leveling demethanol type one-component organic silica gel and its preparation method
  • A transparent high-strength self-leveling demethanol type one-component organic silica gel and its preparation method

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preparation example Construction

[0044] The method for preparing a transparent high-strength self-leveling and methanol-removing type one-component organic silica gel includes the following steps:

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

[0046] 2) Add cross-linking agent to the mixture obtained in the previous step, and disperse and stir under vacuum;

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

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

[0049] Preferably, in step 2), the vacuum degree is 0.075 to 0.095 MPa, the rotation speed is 300 t...

Embodiment 1

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

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

[0055] (3) Add 1.5 parts by mass of γ-(2,3-epoxy, propyloxy) 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 for 40min under vacuum;

[0056] (4) Discharge the sealed package and test.

Embodiment 2

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

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

[0065] (3) Add 2.5 parts by mass of γ-(2,3-epoxy, propyloxy)propyltrimethoxysilane, 1.5 parts by mass of γ-aminopropyltrimethoxysilane, and 3 parts by mass of 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 the sealed package and 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 and methanol-removing type single-component organic silica gel and a preparation method thereof. Background technique [0002] After vulcanization, organosilicone sealant has excellent cold resistance, heat resistance, weather resistance and electrical insulation properties, and has a wide range of applications in aerospace, construction, automobiles and electronics. [0003] Transparent dealcoholized silica gel, without the pungent odor of acid transparent gel, compared with ketoxime silica gel, the released neutral small molecules are more environmentally friendly and will not be corrosive to copper metal, PC and other materials. Relatively wider application. [0004] Higher technology and production process requirements have resulted in not many mature transparent demethanolized silica gel products in China. The main products available on the market are the sub-packaged products of imported ...

Claims

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Application Information

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Patent Type & Authority Patents(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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