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Organosilicon sealant and preparation method thereof

A silicone and sealant technology, used in adhesives, adhesive additives, non-polymer adhesive additives, etc., can solve the problems of loosening, poor deep curing, and debonding of the bonded materials, and improve flexibility, The effect of increasing the vulcanization rate and improving the ability of the cross-linking reaction

Active Publication Date: 2020-04-14
GUANGZHOU BAIYUN CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the deketoxime type sealant on the market has a faster surface drying speed, but the depth of curing is generally poor. Generally, the curing depth of 24 hours is only about 2-4mm, which leads to the existence of defects when the bonded materials move in a short time. Risk of loosening, debonding and falling, a drawback that is evident in industrial product applications

Method used

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  • Organosilicon sealant and preparation method thereof
  • Organosilicon sealant and preparation method thereof
  • Organosilicon sealant and preparation method thereof

Examples

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preparation example Construction

[0043] This embodiment also provides a method for preparing a silicone sealant, comprising the following steps:

[0044] (1) Preparation of curing agent: reacting diethylene glycol with 3-isocyanatopropyl trialkoxysilane to obtain an intermediate product; reacting the obtained intermediate product with methyl ethyl ketone oxime to obtain a curing agent;

[0045] (2) mixing the α,ω-dihydroxypolydimethylsiloxane, reinforcing filler and plasticizer to obtain a base material;

[0046] (3) Mixing the base material obtained in step (2) with the crosslinking agent, curing agent, coupling agent and catalyst to obtain a silicone sealant.

[0047] In some embodiments, the 3-isocyanatopropyltrialkoxysilane is 3-isocyanatopropyltrimethoxysilane or 3-isocyanatopropyltriethoxysilane.

[0048]In some of these embodiments, in the step (1), the reaction also includes a catalyst, the catalyst is cyclohexylamine, and the addition amount of the cyclohexylamine is 0.5‰-1.5 parts by weight of the ...

Embodiment 1

[0064] Formulation of silicone sealant:

[0065]

[0066] The preparation method of silicone sealant is as follows:

[0067] (1) Preparation of curing agent: under the condition of nitrogen protection, diethylene glycol is slowly added dropwise to 3-isocyanatopropyltrimethoxysilane of twice the molar amount at room temperature to react for 4 hours, and cool to After room temperature, add methyl ethyl ketone oxime in a molar ratio of 8 times, and then add cyclohexylamine of 1‰ of the total material as a catalyst, slowly heat to 110-130°C and react for 6 hours to remove excess methyl ethyl ketone oxime to obtain a curing agent.

[0068] (2) Add a,ω-dihydroxy polydimethylsiloxane, nanometer calcium carbonate and simethicone oil into the kneader and mix evenly according to the above weight parts, heat to 120-130°C, vacuum- 0.095MPa or more continued for 2 to 3 hours, and the obtained base material was cooled to room temperature.

[0069] (3) Add crosslinking agent, curing age...

Embodiment 2

[0071] Formulation of silicone sealant:

[0072]

[0073] The preparation method of this embodiment is the same as that of Example 1.

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Abstract

The invention relates to an organosilicon sealant and a preparation method thereof, wherein the organic silicon sealant is prepared from the following raw materials in parts by weight: 90 to 110 partsof alpha,omega-dihydroxy polydimethylsiloxane, 10 to 150 parts of a reinforcing filler, 2-10 parts of a plasticizer, 2-20 parts of a cross-linking agent, 2-10 parts of a curing agent, 1-10 parts of acoupling agent, and 0.01-1.5 parts of a catalyst. The organosilicon sealant provided by the invention can realize rapid deep curing, and has good hardness and good mechanical properties.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a silicone sealant and a preparation method thereof. Background technique [0002] Silicone sealant is a type of silicone product that is widely used in various industries. It can be used in a wide temperature range (-100°C to 300°C), which is beyond the reach of other elastomers. Weathering resistance is one of its greatest advantages, coupled with excellent properties such as good electrical properties, high and low temperature resistance, and adhesion, it has become a widely used silicone material. [0003] According to the packaging form of the product, silicone sealants are divided into two types: one-component and two-component. Among them, the one-component RTV silicone rubber is packaged in a sealed rubber cartridge. When used, it is extruded from the package and exposed to moisture in the air to cross-link and cure. The degree of vulcanization is from the surface to the...

Claims

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Application Information

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IPC IPC(8): C09J183/04C09J11/06C09J11/04
CPCC08K2003/265C08K2201/011C08K2201/014C09J11/04C09J11/06C09J183/04C08K13/02C08K3/26C08K5/5465C08K5/544C08K13/04C08K7/26C08K5/5435
Inventor 周熠蒋金博付子恩郑常华宋立芝
Owner GUANGZHOU BAIYUN CHEM IND
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