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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 silicone rubbers, but the curing speed is slow and the initial bond strength is low. Speed ​​and initial bond strength

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

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preparation example Construction

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

[0042] Component A is prepared as follows:

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

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

[0045] Component B is prepared as follows:

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

[0047] Specifically, first mix and sti...

Embodiment 1

[0051] A component: set the kinematic viscosity to 20000mm 2 / s α, ω-dihydroxy polydimethylsiloxane, nano-calcium carbonate treated with fatty acid, specific surface area 150m 2 / g fumed silica, kinematic viscosity 350mm 2 / s of simethicone oil is mixed, heated and stirred under vacuum conditions, and then vacuum dehydrated to obtain component A of a two-component silicone rubber sealant that adheres to the base material of the car lamp. The temperature of the heating and stirring is 130°C. Next, vacuum dehydration is carried out on the above mixture, the pressure of the vacuum dehydration is -0.09~-0.1MPa, and the time of the vacuum dehydration is 3 hours.

[0052] Component B: First, mix the black color paste (silicon oil and carbon black in a weight ratio of 3:1, under the conditions of heating temperature of 100-150°C and vacuum dehydration pressure of -0.09MPa~-0.1MPa, High-speed stirring and dispersing for 3-4 hours to obtain a black color paste), cross-linking agent ...

Embodiment 2

[0060] A component: set the kinematic viscosity to 80000mm 2 / s α, ω-dihydroxy polydimethylsiloxane, heavy calcium carbonate, specific surface area 150m 2 / g fumed silica, kinematic viscosity 50mm 2 / s of simethicone oil is mixed, heated and stirred under vacuum conditions, and then dehydrated to obtain component A of the two-component silicone rubber sealant that is adhesive to the base material of the car lamp. The temperature of the heating and stirring is 130°C. Next, vacuum dehydration is carried out on the above mixture, the pressure of the vacuum dehydration is -0.09~-0.1MPa, and the time of the vacuum dehydration is 3 hours.

[0061] Component B: First, mix and stir the black color paste (see Example 1 for the preparation method), the crosslinking agent methyltrimethoxysilane, and vinyltrimethoxysilane. After stirring for 10-20 minutes, disperse at a high speed for 30-40 minutes. After uniform, add coupling agent aminopropyltrimethoxysilane, γ-aminoethylaminopropylt...

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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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