Single-component ketone-oxime-removing type silicon rubber sealant and preparation method thereof

A sealant, silicone rubber technology, applied in the direction of adhesives, chemical instruments and methods, non-polymer adhesive additives, etc., can solve problems such as the decrease of bond strength, and achieve the advantages of isolating penetration damage, simple operation and improving curing speed. Effect

Inactive Publication Date: 2012-07-11
TONSAN ADHESIVES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem that the bonding strength of one-component deketoxime type silicone rubber decreases under high temperature, high

Method used

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  • Single-component ketone-oxime-removing type silicon rubber sealant and preparation method thereof
  • Single-component ketone-oxime-removing type silicon rubber sealant and preparation method thereof
  • Single-component ketone-oxime-removing type silicon rubber sealant and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Add 100g of γ-mercaptopropyltrimethoxysilane and 75g of vinyltrimethoxysilane to a 250mL flask with a thermometer, a vacuum port and a N2 port, and heat the mixture in an oil bath at 70°C , vacuum and start stirring. When the temperature rose to 70°C, turn off the vacuum, add 1g of free radical initiator AIBN under the protection of N2, and stir at 70°C for 2h to synthesize a coupling agent with a special structure. The results show that the mass percent content of the coupling agent with this special structure is >95%.

[0037] Select 100 parts of α, ω-dihydroxy polydimethylsiloxane with a viscosity of 20000mpa.s, 15 parts of simethicone oil with a viscosity of 500mpa.s, 80 parts of calcium carbonate, and 10 parts of fumed white carbon black, and add them to the kneader In the process, start stirring and dispersing, dehydrate at 130°C~140°C, -0.09~-0.1MPa vacuum condition for 2~4 hours, then cool down to below 40°C. Transfer the above slurry to a planetary stirring t...

Embodiment 2

[0039] Select 100 parts of α, ω-dihydroxy polydimethylsiloxane with a viscosity of 20000mpa.s, 15 parts of simethicone oil with a viscosity of 500mpa.s, 80 parts of calcium carbonate, and 10 parts of fumed white carbon black, and add them to the kneader In the process, start stirring and dispersing, dehydrate at 130°C~140°C, -0.09~-0.1MPa vacuum condition for 2~4 hours, then cool down to below 40°C. Transfer the above slurry to a planetary stirring tank, add 10 parts of vinyl tributylketoxime silane under the protection of N2, 1 part of special coupling agent synthesized in Example 1, and 1 part of γ-aminopropyltrimethoxysilane , 0.3 part of dibutyltin dilaurate, stirred under vacuum condition of -0.09~-0.1MPa until uniform without bubbles.

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Abstract

The invention relates to a single-component ketone-oxime-removing type silicon rubber sealant. The single-component ketone-oxime-removing type silicon rubber sealant comprises the following components in part by weight: (A) 100 parts of alpha, omega-dihydroxyl polydimethylsiloxane, (B) 10 to 30 parts of dimethyl silicon oil, (C) 7 to 12 parts of ketone-oxime-removing type crosslinking agent, (D) 1 to 5 parts of silane coupling agent with a special structure, (E) 50 to 150 parts of reinforcing filler and (F) 0.1 to 1 part of catalyst. The sealant comprises the silane coupling agent with the special structure. Due to introduction of the coupling agent, the sealant has excellent bonding durability, and particularly high bonding strength retention ratio under high-temperature high-humidity conditions and a water boiling environment. In addition, due to introduction of the coupling agent, the curing speed of the silicon rubber sealant is increased, and the coupling agent can be widely applied to bonding and sealing of industries such as electrons, automobiles, home appliances and the like.

Description

technical field [0001] The invention relates to a silicone rubber sealant and a preparation method thereof. In particular, it relates to a one-component room temperature vulcanized deketoxime type silicone rubber sealant and a preparation method thereof. [0002] Background technique [0003] Silicone sealants have the advantages of wide temperature resistance and good weather resistance, and are widely used in electronics, automobiles, home appliances, construction and other industries; single-component deketoxime type silicone sealants have moderate vulcanization speed and are It has the advantages of less stability and stable storage, and occupies a large share in the market. When deketoxime type one-component room temperature curing silicone rubber is used as an adhesive and sealant, it is often necessary to add a tackifier to improve its bonding performance with the substrate; currently commercially available deketoxime type one-component silicone rubber is commonly u...

Claims

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Application Information

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IPC IPC(8): C08L83/06C08L83/04C09K3/10C08K13/02C08K5/5465C08K5/5419C09J183/06C09J183/04C09J11/06C09J11/04
Inventor 王瑶李印柏翟海潮林新松
Owner TONSAN ADHESIVES INC
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