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Condensation type two-component silicone sealant and preparation method

A silicone sealant, two-component technology, applied in the field of sealant, can solve the problems of affecting the application and the decline of mechanical properties, and achieve the effects of high retention rate, reduced strength decay, and fast curing.

Active Publication Date: 2019-11-01
GUANGZHOU BAIYUN CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under high temperature conditions, its mechanical properties will show a more obvious downward trend, which affects its application in fields with high requirements for bonding strength at high temperatures.
[0004] At present, there is no domestic patent report of a condensation-type two-component silicone sealant with high strength retention under high temperature conditions

Method used

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  • Condensation type two-component silicone sealant and preparation method
  • Condensation type two-component silicone sealant and preparation method
  • Condensation type two-component silicone sealant and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The preparation raw materials and preparation method of a kind of condensation type two-component silicone sealant of this embodiment are as follows:

[0050] 100 parts by weight of α, ω-dihydroxy polydimethylsiloxane with a viscosity of 12 Pa.s at 25°C, 1 part by weight of dimethyl silicone oil with a viscosity of 0.35 Pa.s at 25°C, methyl MQ silicone resin 15 parts by weight, 2 parts by weight of ferric oxide and 90 parts by weight of nano-active calcium carbonate were added to the kneader, the temperature of the kneader was controlled at 80°C, blended for 90 minutes, and component A was obtained after cooling.

[0051] In the planetary machine, mix 100 parts by weight of dimethyl silicone oil with a viscosity of 12Pa.s at 25°C and 25 parts by weight of carbon black evenly, heat up to 120°C, stir for 1.5 hours under vacuum, and cool down to about 30°C. Under nitrogen, add 15 parts by weight of ethyl orthosilicate, 5 parts by weight of methyltrimethoxysilane, 6 parts b...

Embodiment 2

[0054] The preparation raw materials and preparation method of a kind of condensation type two-component silicone sealant of this embodiment are as follows:

[0055]100 parts by weight of α, ω-dihydroxy polydimethylsiloxane with a viscosity of 50 Pa.s at 25°C, 12 parts by weight of dimethyl silicone oil with a viscosity of 0.1 Pa.s at 25°C, methylphenyl silicon Add 20 parts by weight of resin, 2 parts by weight of zinc oxide and 100 parts by weight of nano-active calcium carbonate into a kneader, control the temperature of the kneader to 50°C, blend for 110 minutes, and obtain component A after cooling.

[0056] In the planetary machine, mix 100 parts by weight of dimethyl silicone oil with a viscosity of 1Pa.s at 25°C, 1 part by weight of carbon black, and 23 parts by weight of nano-active calcium carbonate. After heating up to 120°C, stir 1.5 parts under vacuum. Hours, lower the temperature to about 30°C, and add 18 parts by weight of propyl orthosilicate, 5 parts by weight ...

Embodiment 3

[0059] The preparation raw materials and preparation method of a kind of condensation type two-component silicone sealant of this embodiment are as follows:

[0060] 100 parts by weight of α, ω-dihydroxy polydimethylsiloxane with a viscosity of 20 Pa.s at 25°C, 14 parts by weight of dimethyl silicone oil with a viscosity of 0.5 Pa.s at 25°C, methylphenyl silicon Add 20 parts by weight of resin, 2 parts by weight of cerium oxide, and 110 parts by weight of nano-active calcium carbonate into a kneader, control the temperature of the kneader to 70°C, blend for 50 minutes, and obtain component A after cooling.

[0061] In the planetary machine, mix 100 parts by weight of dimethyl silicone oil with a viscosity of 8Pa.s at 25°C and 15 parts by weight of carbon black evenly, heat up to 120°C, stir for 1.5 hours under vacuum, and cool down to about 30°C. In the state of nitrogen gas, 22 parts by weight of methyltriethoxysilane oligomer (polymerization degree 2-4), 8 parts by weight of...

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Abstract

The invention relates to a condensed dual-component silicone sealant and a preparation method thereof. The silicone sealant is prepared from a component A and a component B, wherein the component A comprises, by weight, 100 parts of alpha, omega-dihydroxypolydimethylsiloxane, 1-50 parts of dimethicone, 5-25 parts of silicone resin, 1-10 parts of an additive and 90-110 parts of an inorganic filler; and the component B comprises, by weight, 100 parts of dimethicone, 0.5-25 parts of carbon black, 0-25 parts of an inorganic filler, 5-35 parts of a composite cross-linking agent, 3-20 parts of a composite coupling agent and 0.05-0.5 parts of a catalyst; a mass ratio of the component A to the component B is (8-20):1; the silicone resin is at least one selected from methyl silicone resin, methylphenyl silicone resin, methyl MQ silicone resin and vinyl MQ silicone resin; and the additive is at least one selected from zinc oxide, ferric oxide, cerium oxide and nickel oxide. The strength retention of the silicone sealant in high temperature environment is high.

Description

technical field [0001] The invention relates to the field of sealants, in particular to a condensation-type two-component silicone sealant and a preparation method. Background technique [0002] Silicone sealant can be divided into one-component silicone sealant and two-component silicone sealant according to its packaging, product composition and use process. Two-component silicone sealant is prepared with hydroxyl-terminated polydimethylsiloxane as the base resin, combined with crosslinking agent, coupling agent, catalyst, filler, etc. The salient feature of silicone sealants is their excellent weather resistance, so they are widely used as adhesives, sealants and potting agents. It is widely used in curtain walls, electronic appliances, automobiles, high-speed rail and other fields. [0003] Silicone sealants are used above room temperature under various application conditions. Silicone sealants have good high and low temperature resistance. Generally, they will not sof...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J183/06C09J183/04C09J11/04C09J11/06C09J11/08
CPCC08K2201/011C08L2201/08C08L2205/025C08L2205/035C09J11/04C09J11/06C09J11/08C09J183/06C08L83/04C08K13/02C08K3/04C08K2003/2296C08K2003/2272C08K2003/2213C08K2003/2293C08K2003/265C08K5/544
Inventor 蒋金博施其锋张冠琦黄恒超
Owner GUANGZHOU BAIYUN CHEM IND
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