Dealcoholized silicone rubber sealant and preparation method thereof

A silicone rubber and sealant technology, applied in the field of organic silicone rubber, can solve the problems affecting the curing performance, curing performance and bonding performance, vulcanization performance and physical properties of dealcoholized RTV silicone rubber, and achieves the ability to be suitable for large Large-scale production and application, good greenhouse curing performance, excellent adhesion effect

Active Publication Date: 2018-10-09
HANGZHOU ZHIJIANG NEW MATERIAL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some problems in the dealcoholized silicone rubber sealant: due to the trace moisture and free alcohol in the dealcoholized room temperature vulcanized silicone rubber in the presence of an organometallic catalyst, chain cutting and equilibrium reactions occur with polysiloxane, Formed a short chain and no cross-linking function (CH 3 O)(CH 3 ) 2 SiO 1 / 2 Products such as end groups, so that the vulcanization performance and physical properties will gradually decrease or even disappear with the prolongation of storage time, especially the poor adhesion to glass, plastic, metal and other substrates
At present, the prior art generally adopts the method of adding a hydroxyl scavenger to effectively prevent the generation of free alcohol in dealcoholized room temperature vulcanized silicone rubber, wherein the most commonly used hydroxyl scavenger is hexamethyldisilazane; however, hexamethyldisilazane The base disilazane will release ammonia gas, which will cause corrosion to copper and other materials, and at the same time affect the curing performance of dealcoholized room temperature vulcanized silicone rubber, especially in dealcoholized silicone rubber with Ti as the catalyst, which can affect the curing performance. and adhesive properties have a greater impact on

Method used

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  • Dealcoholized silicone rubber sealant and preparation method thereof
  • Dealcoholized silicone rubber sealant and preparation method thereof
  • Dealcoholized silicone rubber sealant and preparation method thereof

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preparation example Construction

[0086] The present invention also provides a preparation method of the dealcoholized silicone rubber sealant described in the above technical solution, comprising the following steps:

[0087] a) mixing an amino coupling agent, an epoxy coupling agent and a polyisocyanate compound, and reacting to obtain a tackifier;

[0088] b) mixing polydimethylsiloxane, calcium carbonate, a silicone crosslinking agent, a catalyst and the tackifier obtained in step a), and obtaining a dealcoholized silicone rubber sealant after discharging.

[0089] In the invention, the amino coupling agent, the epoxy coupling agent and the polyisocyanate compound are firstly mixed and reacted to obtain the tackifier. In the present invention, the amino coupling agent is preferably selected from aminopropyltrimethoxysilane, aminopropyltriethoxysilane, γ-aminoethylaminopropyltrimethoxysilane, γ-aminoethylamino Propyltriethoxysilane, bis[3-(triethoxysilyl)propyl]amine, bis(3-trimethoxysilylpropyl)amine, bis...

Embodiment 1

[0109] (1) Mix aminopropyltrimethoxysilane, γ-glycidyloxypropyltrimethoxysilane and 1,6-hexamethylene diisocyanate in a molar ratio of 1:2:2, and react at 50°C for 110 hours to obtain Tackifier.

[0110] (2) Put 100 parts by weight of α, ω-dihydroxy polydimethylsiloxane, 10 parts by weight of simethicone oil, 120 parts by weight of nano-calcium carbonate and 8 parts by weight of white paste into the high-speed dispersion planet Stir in the machine, heat to 120°C at the same time, and vacuum dehydrate at -0.09MPa~-0.1MPa for 3h to obtain the dehydrated mixed material; then cool the above mixed material to below 50°C, and add 8 parts by weight of methyl trimethyl Oxysilane and 6 parts by weight of ethyl acetoacetate titanium compound are stirred evenly under vacuum conditions, then add 0.5 parts by weight of tackifier, continue to stir evenly under vacuum conditions, and obtain dealcoholized silicone rubber after discharging Sealants.

Embodiment 2

[0112] (1) Mix aminopropyltrimethoxysilane, γ-glycidyloxypropyltrimethoxysilane and 1,6-hexamethylene diisocyanate in a molar ratio of 1:2:1.5, and react at 50°C for 110h to obtain Tackifier.

[0113] (2) 40 parts by weight of α, ω-dihydroxypolydimethylsiloxane, 60 parts by weight of α-hydroxy-ω-trimethylsilyl-terminated polydimethylsiloxane, 120 parts by weight The nano-calcium carbonate and 8 weight parts of white slurry were put into a high-speed dispersing planetary machine for stirring, and heated to 120°C at the same time, and vacuum dehydrated at -0.09MPa~-0.1MPa for 3h to obtain a dehydrated mixed material; then the above Cool the mixture to below 50°C, add 8 parts by weight of methyltrimethoxysilane and 6 parts by weight of ethyl acetoacetate titanium compound, stir evenly under vacuum conditions, then add 0.5 parts by weight of tackifier, Stir evenly under the condition of dehumidification, and obtain dealcoholized silicone rubber sealant after discharging.

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Abstract

The invention provides a dealcoholized silicone rubber sealant. The dealcoholized silicone rubber sealant comprises the following components: 100 parts of polydimethylsiloxane, 20 to 200 parts of calcium carbonate, 2 to 12 parts of a silicone crosslinking agent, 0.05 to 8 parts of a catalyst, and 0. 05 part to 5 parts of a tackifier all in parts by weight; the tackifier is prepared from an amino coupling agent, an epoxy coupling agent, and a polyisocyanate compound. Compared with the prior art, the dealcoholized silicone rubber sealant provided by the invention adopts the specific tackifier, and cooperates with other specific content components to achieve better interaction, so that the product has better greenhouse curing performances, long-term storage stability, excellent adhesion and good adhesion durability. Experimental results show that the dealcoholized silicone rubber sealant provided by the invention has good adhesion to all materials of metal, various plastic, ceramic, glassand the like, and can be used for sealing photovoltaic components, buildings, automobiles, electronic appliances and the like.

Description

technical field [0001] The invention relates to the technical field of silicone rubber, in particular to a dealcoholized silicone rubber sealant and a preparation method thereof. Background technique [0002] Silicone rubber glue is a kind of thixotropic one-component room temperature curing silicone rubber, which can be cured with moisture in the air at room temperature. Performance and insulation performance, while the adhesive layer has excellent moisture-proof, shock-resistant, corona-resistant, and anti-leakage properties. [0003] At present, there are many kinds of compositions of room temperature curing silicone rubber and they are widely used. Among them, polydimethylsiloxane and alkoxysilane terminated by hydroxyl or alkoxysilyl groups are used as the main raw materials, and in the presence of organic titanium, zirconium, and tin compound catalysts, alcohol compounds are released to solidify dealcohol Type room temperature vulcanized silicone rubber composition h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/04C09J183/04C09J11/04C09J11/06C09J11/08C08G18/61C08G18/73C08G18/00C09K3/10
CPCC08G18/003C08G18/61C08G18/73C08K2003/265C08K2201/011C08K2201/014C08L2203/20C08L2205/025C09J11/04C09J11/06C09J11/08C09J175/04C09J183/04C09K3/1018C09K3/1021C09K2200/065C09K2200/0685C08L83/04C08K3/26C08K5/5419
Inventor 张原志成倪建华倪皇伟凌建锋何永富
Owner HANGZHOU ZHIJIANG NEW MATERIAL CO LTD
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