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Dealcoholized silicone rubber sealant

A sealant, dimethyl silicone oil technology, used in adhesives, adhesive additives, polymer adhesive additives, etc., can solve the problems of unresearched initial curing speed and initial shear strength, and achieve excellent adhesion and The effect of curing speed, improving curing speed, good mechanical properties

Active Publication Date: 2017-07-18
HANGZHOU ZHIJIANG SILICONE CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sealants in the prior art generally focus on cohesiveness, and have not studied the initial curing speed and initial shear strength

Method used

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  • Dealcoholized silicone rubber sealant
  • Dealcoholized silicone rubber sealant
  • Dealcoholized silicone rubber sealant

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0033] The present invention has no special limitation on the preparation method of the sealant, and it can be prepared by adopting the preparation method of the sealant well known to those skilled in the art. In the present invention, the preparation method of the sealant is preferably:

[0034] After mixing α,ω-dihydroxy polydimethylsiloxane, dimethyl silicone oil, calcium carbonate and the color paste, vacuum dehydration after heating, and cooling to obtain a mixture;

[0035] mixing the mixture with an organosilicon crosslinking agent and a titanium-containing catalyst, and stirring under vacuum conditions to obtain a mixture;

[0036] Adding silane coupling agent and polar group-modified polybutadiene into the mixture, stirring and lowering the temperature under vacuum condition, to obtain the sealant.

[0037]In the present invention, the heating temperature is preferably 100-150°C, more preferably 120-130°C. In the present invention, the pressure of the vacuum dehydra...

Embodiment 1

[0040] Set the kinematic viscosity to 20000mm 2 / s of α, ω-dihydroxy polydimethylsiloxane, 350mm 2 / s simethicone oil, nano-calcium carbonate, and white slurry are put into a high-speed dispersing planetary machine and stirred, and heated to 120°C at the same time, vacuum dehydrated at -0.09~-0.1MPa for 3 hours, and cooled to below 50°C after the moisture is removed , add methyltrimethoxysilane, ethyl acetoacetate titanium compound, stir evenly under vacuum condition, then add epoxy oligosilane and maleic anhydride modified polybutadiene, stir evenly under vacuum condition The amount and source of the above raw materials are shown in Table 1, and Table 1 shows the amount and source of the raw materials used in Example 1 of the present invention.

[0041] Table 1 The amount and source of raw materials used in Embodiment 1 of the present invention

[0042]

Embodiment 2

[0044] Set the kinematic viscosity to 20000mm 2 / s of α, ω-dihydroxy polydimethylsiloxane, 350mm 2 Put the simethicone oil, nano-calcium carbonate, and black slurry into the high-speed dispersing planetary machine and stir at the same time, heat to 120°C at the same time, vacuum dehydrate at -0.09~-0.1MPa for 3 hours, and cool down to below 50°C after the water is removed , add methyltrimethoxysilane, vinyltrimethoxysilane and ethyl acetoacetate titanium complex, stir evenly under vacuum, then add epoxy oligosilane and maleic anhydride modified polybutadiene, Stir evenly under vacuum conditions and then discharge to obtain a silicone rubber sealant. The contents and sources of the above raw materials are shown in Table 2, and Table 2 shows the amount and source of raw materials used in Example 2 of the present invention.

[0045] Table 2 The used raw material consumption and source of the embodiment of the present invention 2

[0046]

[0047]

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Abstract

The invention provides a dealcoholized silicone rubber sealant, which is prepared from the following components in parts by weight: 100 parts of alpha, omega-dyhydroxyl polydimethylsiloxane, 0.1 to 30 parts of simethicone, 80 to 150 parts of calcium carbonate, 0 to 10 parts of mill base, 5 to 12 parts of silicone cross-linking agent, 0.05 to 5 parts of silane coupling agent, 0.05 to 8 parts of titanium-containing catalyst, and 0.05 to 5 parts of polar group modified polybutadiene. According to the dealcoholized silicone rubber sealant provided by the invention, the polar group modified polybutadiene is adopted, and a polar group is contained, so that the moisture introduction in air is increased, and the initial curing speed and the initial strength of the sealant are improved. According to the dealcoholized silicone rubber sealant provided by the invention, through reasonably controlling the components in the sealant and adjusting the content of each component, so that the sealant has the advantages of fast initial curing speed, high shearing strength, and excellent cohesiveness under the combined action of the components.

Description

technical field [0001] The invention relates to the technical field of sealing, in particular to a dealcoholized silicone rubber sealant. Background technique [0002] Sealant (English name sealant) is also called sealant and sealing material. It is based on high-density material, a material that deforms with the shape of the sealing surface, is not easy to flow, and has a certain degree of adhesion. The sealant has the functions of anti-leakage, waterproof, anti-vibration, sound insulation, heat insulation and so on. Sealants are divided into two categories: adhesive type and non-adhesive type. The adhesive type is divided into elastic type, hot-melt type and anaerobic type; Semi-dry viscoelastic type and non-dry adhesive type and other varieties. In the prior art, the sealant is usually based on dry or non-drying sticky substances such as asphalt, natural resin or synthetic resin, natural rubber or synthetic rubber, combined with inert substances such as talcum powder, c...

Claims

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Application Information

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IPC IPC(8): C09J183/06C09J11/08C09J11/06C09J11/04
CPCC08K2201/011C08L2205/03C09J11/04C09J11/06C09J11/08C09J183/06C08L83/04C08L51/003C08K13/06C08K9/04C08K2003/265C08K5/5419C08K2003/2241C08K5/5425
Inventor 何永富郁泽林郑苏秦陶小乐
Owner HANGZHOU ZHIJIANG SILICONE CHEM
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