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Condensed double-component organosilicon sealant and preparation method thereof

A silicone and sealant technology, applied in the field of sealants, can solve the problems of rapid curing, unsatisfactory thixotropic mechanical properties, etc., and achieve excellent aging resistance, good mechanical properties, and adjustable operating time.

Inactive Publication Date: 2013-09-25
GUANGDONG HENGDA NEW MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, RTV-2 silicone rubber has been used in electronic appliances and automotive components, but the existing RTV-2 silicone rubber is not ideal in terms of overall rapid curing, thixotropy, and mechanical properties.

Method used

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  • Condensed double-component organosilicon sealant and preparation method thereof
  • Condensed double-component organosilicon sealant and preparation method thereof
  • Condensed double-component organosilicon sealant and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] In parts by weight, add 100 parts of 107 glue with a viscosity of 3000cps, 85 parts of a mixture of light calcium carbonate and heavy calcium carbonate, 2 parts of titanium dioxide, 5 parts of simethicone with a viscosity of 100cps, and 3 parts of fumed silica Mixer, stirring under 0.099mpa vacuum for 2 hours to obtain A component.

[0035] In parts by weight, add 80 parts of simethicone oil with a viscosity of 300cps, 20 parts of U carbon black, and 5 parts of fumed silica into the reactor for mixing, slowly raise the temperature to 120°C, then keep the temperature constant, and stir under a vacuum of 0.099mpa After 1 hour, lower the temperature to 30°C, add 5 parts of ethyl orthosilicate, 1 part of γ-aminopropyltriethoxysilane, and 0.05 part of dibutyltin dilaurate under nitrogen atmosphere, and obtain component B after mixing. .

[0036] Mix the prepared component A and component B uniformly at a weight ratio of 2:1, vacuum defoam, and cure to obtain a condensation-...

Embodiment 2

[0038] In terms of parts by weight, add 100 parts of compound 107 glue with a viscosity of 20000cps and a viscosity of 10000cps, 60 parts of light calcium carbonate, 5 parts of titanium dioxide, 30 parts of dimethyl silicone oil with a viscosity of 500cps, and 5 parts of fumed silica into the mixer , and stirred for 3 hours under a vacuum of 0.099mpa to obtain component A.

[0039] In parts by weight, add 60 parts of simethicone oil with a viscosity of 1000cps, 8 parts of U carbon black, and 5 parts of fumed silica into the reaction kettle for mixing, slowly raise the temperature to 120°C, keep the temperature, and stir under a vacuum of 0.099mpa After 1.5 hours, cool down to 30°C, add 10 parts of a mixture of ethyl orthosilicate and methyl orthosilicate, and 3 parts of N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane under nitrogen atmosphere, 0.1 part of dibutyltin diacetate and dibutyltin dilaurate mixture, after mixing to obtain component B.

[0040] Mix the prepared compon...

Embodiment 3

[0042] In parts by weight, add 100 parts of 107 glue with a viscosity of 2500cps, 120 parts of a mixture of silicon micropowder and light calcium carbonate, 1 part of titanium dioxide, 60 parts of simethicone oil with a viscosity of 500cps, and 0.5 parts of organic bentonite into the mixer, at 0.099 Stirring under mpa vacuum for 4 hours to obtain component A.

[0043] In parts by weight, add 30 parts of simethicone oil with a viscosity of 500 cps, 12 parts of a mixture of titanium dioxide and U carbon black, and 0.5 parts of organic bentonite into the reactor and mix them. After stirring for 2 hours, the temperature was lowered to 30°C, and 15 parts of a mixture of dimethyldiethoxysilane and ethyl orthosilicate, γ-aminopropyltriethoxysilane and N-(β-ammonia 5 parts of ethyl)-γ-aminopropyltrimethoxysilane mixture, 0.3 part of dibutyltin dilaurate, mixed well to obtain component B.

[0044] Mix the prepared component A and component B uniformly at a weight ratio of 5:1, vacuum ...

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Abstract

The invention discloses a condensed double-component organosilicon sealant. The condensed double-component organosilicon sealant comprises a component A and a component B, the weight ratio of the component A to the component B is 10:1-2:1, the component A comprises, by weight, 100 parts of alpha, omega-dihydroxypolydimethylsiloxane, 60-120 parts of a filler, 1-5 parts of a pigment, 5-60 parts of a plasticizer and 0.5-5 parts of a thixotropic agent, and the component B comprises, by weight, 5-15 parts of a polyfunctional organosilicon cross-linking agent, 1-5 parts of a silane coupling agent, 0.05-0.5 parts of a catalyst, 5-20 parts of the pigment, 0.5-5 parts of the thixotropic agent and 30-80 parts of the plasticizer. The condensed double-component organosilicon sealant has a tensile strength and a shear strength reaching above 2.0MPa respectively, has an elongation at break reaching above 700%, has an adjustable operating time, can rapidly and deeply solidify at room temperature, and has the advantages of high thixotropy, high elasticity, good weatherability, good storage stability and the like.

Description

technical field [0001] The invention relates to the technical field of sealants, in particular to a condensation-type two-component silicone sealant and a preparation method thereof. Background technique [0002] Room temperature vulcanization condensation type silicone rubber can be divided into one-component room temperature vulcanization condensation type silicone rubber (RTV-1) and two-component room temperature vulcanization condensation type silicone rubber (RTV-2) according to its packaging method, composition and use process. [0003] RTV-1 is convenient and simple to use, and has excellent adhesive and mechanical properties, but its curing speed is slow. Since RTV-1 reacts with moisture in the air and solidifies into an elastomer, it starts from the surface and gradually solidifies to the inside during curing. Its curing depth is only 10mm within a certain period of time, and it is difficult to cure in the middle of large-area materials. With the development of ele...

Claims

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Application Information

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IPC IPC(8): C09J183/06C09J11/04C09J11/06C09J11/08C09K3/10
Inventor 黄华周为民
Owner GUANGDONG HENGDA NEW MATERIALS TECH
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