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Low-viscosity and high-strength transparent organic silicon compound as well as preparation method and application thereof

A high-strength, low-viscosity technology, applied in chemical instruments and methods, non-polymer adhesive additives, adhesives, etc., can solve the problems of not being able to obtain transparent silicone rubber products, reducing the transparency of silicone rubber, and increasing the viscosity of silicone rubber , to achieve the effect of solving the contradiction between strength and viscosity, simplifying the production process and improving adhesion

Inactive Publication Date: 2015-06-10
GUANGZHOU HUITIAN FINE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when calcium carbonate or quartz powder is added, even a very small amount will seriously reduce the transparency of silicone rubber, and transparent silicone rubber products cannot be obtained; although the addition of white carbon black has relatively little effect on the transparency of silicone rubber, white Carbon black will cause the viscosity of silicone rubber to rise sharply, so that it is impossible to obtain transparent room temperature vulcanized silicone rubber products with low viscosity and high mechanical strength

Method used

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  • Low-viscosity and high-strength transparent organic silicon compound as well as preparation method and application thereof
  • Low-viscosity and high-strength transparent organic silicon compound as well as preparation method and application thereof
  • Low-viscosity and high-strength transparent organic silicon compound as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1. Add 90 parts of vinyl-terminated dimethoxysilyl polydimethylsiloxane with a viscosity of 20,000 mPa.s at 25°C to a high-speed stirring disperser 20 parts of methyl-terminated polydimethylsiloxane with a viscosity of 100 mPa.s at 25°C and 50 parts of alkoxymethyl-terminated MQ silicone resin Where (t+m) / q=0.9, t / m=0.06, at a temperature of 90°C and a vacuum of -0.095MPa, stir at 500 rpm for 50 minutes, then cool to room temperature to make the base material; Add 5 parts of vinyltrimethoxysilane and 0.5 parts of bis(γ-trimethoxysilylpropyl)amine, stir at 150 rpm for 30 minutes under vacuum -0.095MPa; then add 3 parts of tetratitanate For tert-butyl ester, under vacuum -0.095MPa, stir at 150 rpm for 30 minutes, make it evenly mixed and discharge, and fill it in an air-insulated high-density polyethylene tube to obtain a single-component product. Product performance tests and related standards are shown in Table 1.

Embodiment 2

[0040] Example 2. Add 90 parts of trimethoxysilyl-terminated polydimethylsiloxane with a viscosity of 5000mPa.s at 25°C to a high-speed stirring disperser 20 parts of methyl-terminated polydimethylsiloxane with a viscosity of 100 mPa.s at 25°C and 50 parts of alkoxymethyl-terminated MQ silicone resin [(CH 3 O) 3 SiO 1 / 2 ] t [(CH 3 ) 3 SiO 1 / 2 ] m (SiO 4 / 2 ) q , where (t+m) / q=0.9, t / m=0.06, at a temperature of 90°C and a vacuum of -0.095MPa, stirred at 500 rpm for 50 minutes, then cooled to room temperature to make the base material; Add 5 parts of methyltrimethoxysilane and 0.5 parts of 1,3,5-tris(trimethoxysilylpropyl)isocyanurate to the feed, and stir at 150 rpm for 30 minutes under vacuum-0.095MPa; then Add 3 parts of 1,3-cyclopropanedioxydi-tert-butyl titanate, stir at 150 rpm for 30 minutes under a vacuum of -0.095 MPa, make it evenly mixed, and then discharge the material, and fill it in a high-pressure container with no air One-component products are obtained...

Embodiment 3

[0041] Example 3, the low-viscosity, high-strength one-component transparent dealcoholized room temperature vulcanizing silicone composition and its production method, the composition of which is different from that of Example 1 in that the alkoxymethyl-terminated MQ silicon resin The ratios of (t+m) / q and t / m are different, wherein (t+m) / q=1.20 and t / m=0.10 in this embodiment.

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Abstract

The invention discloses a low-viscosity and high-strength transparent organic silicon compound. The low-viscosity and high-strength transparent organic silicon compound comprises the following raw materials in parts by weight: 60-90 parts of end alkoxy polydimethyl siloxane, 10-40 parts of end methyl polydimethyl siloxane, and 20-80 parts of end alkoxy methyl MQ silicon resin, wherein the end alkoxy polydimethyl siloxane is a direct-chain type polymer with two or three hydrolysable groups in the end group; the structure formula of the end alkoxy methyl MQ silicon resin is as shown in the specification, wherein b is 0 or 1, R3 and R4 are monovalent hydrocarbyl with 1-4 carbon atoms; t, m and p are positive integers, (t+m) / q is 0.7-1.50, t / m is 0.04-0.20. The organic silicon compound provided by the invention has the advantages of low viscosity, easy flow, high strength and good transparency, and is very suitable for the shallow encapsulation of the electronic elements such as a circuit board and an intelligent water meter, the adhesion of the LED illuminator lampshade and the lamp holder, the bonding and sealing of the small household appliances such as a glass electric kettle body and a chassis.

Description

technical field [0001] The invention relates to the field of polymer sealing materials, in particular to a low-viscosity and high-strength transparent organosilicon composition and its preparation method and application. Background technique [0002] Silicone rubber is a silicone polymer elastomer with a series of unique properties, such as excellent weather resistance, excellent high and low temperature aging resistance, good electrical insulation and hydrophobicity, so it is used in construction, transportation, automobiles, aviation , aerospace, new energy, machinery, electronics and electrical appliances and other fields have a wide range of applications. Room temperature vulcanized silicone rubber (RTV) can be naturally cured into silicone elastomers at room temperature when exposed to moisture. Agents, sealants, potting agents, coating agents and release agents, etc. According to the application requirements, room temperature vulcanized silicone rubber can be made in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/06C08L83/04C08K5/5425C08K5/544C08K5/10C08K5/5419C08K5/5455C08J3/24C09J183/06C09J183/04C09J11/06C09K3/10
Inventor 何业明史襄桥张银华
Owner GUANGZHOU HUITIAN FINE CHEM
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