Double-component silicone rubber sealing agent for automobile lamp assembling sealing and preparation method thereof

A technology for assembly sealing and automotive lights, applied in the direction of adhesives, polymer adhesive additives, non-polymer adhesive additives, etc., can solve the problems of slow curing speed and low initial bonding strength, and achieve improved bonding Performance, good bonding performance and environmental resistance, the effect of preventing penetration and destruction

Active Publication Date: 2017-09-15
HANGZHOU ZHIJIANG SILICONE CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the silicone rubbers involved in the above-mentioned patents are all single-component curing silic

Method used

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  • Double-component silicone rubber sealing agent for automobile lamp assembling sealing and preparation method thereof
  • Double-component silicone rubber sealing agent for automobile lamp assembling sealing and preparation method thereof
  • Double-component silicone rubber sealing agent for automobile lamp assembling sealing and preparation method thereof

Examples

Experimental program
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Effect test

Example Embodiment

[0041] The present invention also provides a method for preparing the above-mentioned two-component silicone rubber sealant for assembling and sealing automobile lamps, which includes the following steps:

[0042] The A component is prepared as follows:

[0043] Mix α, ω-dihydroxy polydimethylsiloxane, dimethyl silicone oil, calcium carbonate and white carbon black, vacuum dehydration after heating, and cool down to obtain component A;

[0044] Among them, the temperature of the heating and stirring is preferably 100 to 150°C, more preferably 110 to 140°C. Next, vacuum dehydration is performed on the above mixture. The pressure of the vacuum dehydration is preferably -0.09 to -0.1 MPa, and the time of the vacuum dehydration is preferably 2 to 4 hours.

[0045] The B component is prepared as follows:

[0046] The color paste, cross-linking agent, coupling agent, white carbon black and catalyst are mixed and reacted, and dehydrated in vacuum to obtain component B.

[0047] Specifically, f...

Example Embodiment

[0050] Example 1

[0051] Component A: Set the kinematic viscosity to 20000mm 2 / s α,ω-dihydroxy polydimethylsiloxane, fatty acid treated nano calcium carbonate, specific surface area 150m 2 / g gas phase method white carbon black, kinematic viscosity 350mm 2 / s of dimethyl silicone oil is mixed, heated and stirred under vacuum conditions, and then vacuum dehydrated to obtain the A component of a two-component silicone rubber sealant that is bonded to the substrate of automobile lamps. The temperature of the heating and stirring is 130°C. Next, vacuum dehydration is performed on the above mixture, the pressure of the vacuum dehydration is -0.09 to -0.1 MPa, and the time of the vacuum dehydration is 3 hours.

[0052] Component B: First, black color paste (mixing silicone oil and carbon black in a weight ratio of 3:1, heating temperature of 100 ~ 150 ℃, vacuum dehydration pressure-0.09MPa ~ -0.1MPa conditions, Stir and disperse at high speed for 3 to 4 hours to obtain a black color p...

Example Embodiment

[0059] Example 2

[0060] Component A: Set the kinematic viscosity to 80,000mm 2 / s α, ω-dihydroxy polydimethylsiloxane, heavy calcium carbonate, specific surface area 150m 2 / g gas phase method white carbon black, kinematic viscosity 50mm 2 / s of dimethyl silicone oil is mixed, heated and stirred under vacuum conditions, and then dehydrated to obtain the A component of the two-component silicone rubber sealant that is bonded to the substrate of the automobile lamp. The temperature of the heating and stirring is 130°C. Next, vacuum dehydration is performed on the above mixture, the pressure of the vacuum dehydration is -0.09 to -0.1 MPa, and the time of the vacuum dehydration is 3 hours.

[0061] B component: First, mix and stir the black color paste (see Example 1 for the preparation method), the crosslinking agent methyltrimethoxysilane, and vinyltrimethoxysilane. After stirring for 10-20min, disperse at high speed for 30-40min. After homogenization, add the coupling agent amino...

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Abstract

The invention provides a double-component silicone rubber sealing agent for automobile lamp assembling sealing. The double-component silicone rubber sealing agent comprises a component A and a component B, wherein the component A is prepared by, by weight, 100 parts of alpha, omega-dihydroxy polydimethyl siloxane, 0-20 parts of dimethyl silicone oil, 70-120 parts of calcium carbonate and 0-10 parts of white carbon black; the component B is prepared by, by weight, 20-100 parts of color paste, 8-15 parts of crosslinking agent, 5-12 parts of coupling agent, 0-20 parts of white carbon black and 0.5-3 parts of catalyst.

Description

technical field [0001] The invention belongs to the technical field of sealants, and in particular relates to a two-component silicone rubber sealant used for assembly and sealing of automobile lamps and a preparation method thereof. Background technique [0002] Silicone rubber has been widely used in various fields such as aerospace, electronics, medical equipment and automobiles, and has played an important role in the national economy. Silicone rubber is a rubber whose main chain is alternately arranged with silicon and oxygen atoms, and there are usually two organic groups attached to the silicon atoms. Silicone rubber has excellent high and low temperature resistance (-60°C to 260°C). The special silicone rubber can be used at a temperature above 300°C. It also has excellent weather resistance, physiological inertia, electrical insulation and air permeability. [0003] According to the type of reaction, silicone rubber can be divided into condensation type and additio...

Claims

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Application Information

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IPC IPC(8): C09J183/06C09J11/08C09J11/06C09J11/04
CPCC08K2003/265C08K2201/011C08K2201/014C08L2205/025C08L2205/03C08L2205/035C09J11/04C09J11/06C09J11/08C09J183/06C08L83/04C08K13/06C08K9/04C08K3/26C08K3/36C08K5/5419C08K5/544C08K13/02C08K5/5425C08K5/5435
Inventor 何永富李鹏洲陶小乐郑苏秦沈彩娥
Owner HANGZHOU ZHIJIANG SILICONE CHEM
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