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One-component thermostable silicone sealant

A silicone sealant, high temperature resistant technology, applied in adhesives, dyed organic silicon compound treatment, other chemical processes, etc., can solve the problems of decreased elasticity, insufficient heat resistance, elastic fatigue, etc., to improve elasticity, improve durability Effects of Thermal Properties and Low Temperature Resistance

Inactive Publication Date: 2008-08-27
GUANGDONG SANVO CHEM IND TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ordinary one-component room temperature vulcanized silicone rubber is not good enough in heat resistance, and cannot withstand the high temperature of about 200 ℃ in the sealing part of the engine for a long time and the instantaneous high temperature generated during ignition; the elastic recovery is not good enough, and the elasticity decreases at low temperature; Use is prone to elastic fatigue, affecting sealing performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] With α, 50 kilograms of omega-dihydroxypolydimethylsiloxane, 50 kilograms of α, ω-dihydroxypolydiphenylsiloxane, 3 kilograms of methyl vinyl bis (N-methyl acetamido) silane, Fumed silica SiO 2 Add 12 kg into the planetary mixer, vacuumize, the vacuum degree is 0.09MPa, the speed is 35rpm, after stirring for 60 minutes, add cerium oxide CeO 2 20 kg, heated to 100°C and vacuumed, vacuum degree 0.09MPa, stirred for 60 minutes, then added 14 kg of methyl tributylketoxime silane, 4 kg of γ-aminopropyl triethoxysiloxane, diacetate diacetate 0.8 kg of butyl tin, after a chemical reaction for 90 minutes at a vacuum degree of 0.09 MPa and a rotational speed of 35 rpm, a one-component high-temperature-resistant silicone sealant was prepared.

Embodiment 2

[0029] With α, 75 kilograms of omega-dihydroxypolydimethylsiloxane, 35 kilograms of α, ω-dihydroxypolydiphenylsiloxane, 5 kilograms of methylvinyl bis (N-methylacetamido) silane, Fumed silica SiO 2 Add 10 kg into the planetary mixer, vacuumize, the vacuum degree is 0.09MPa, the speed is 35rpm, after stirring for 60 minutes, add iron oxide Fe 2 o 3 30 kg, heated to 100 ℃ and vacuumed, vacuum degree 0.09MPa, stirred for 60 minutes, then added 9 kg of vinyl tributylketoxime silane, 4.5 kg of methyl tributylketoxime silane, γ-chloropropyl triethyl 5 kg of oxysiloxane and 1 kg of dibutyltin dilaurate were subjected to a chemical reaction at a vacuum of 0.09 MPa and a rotational speed of 35 rpm for 90 minutes to prepare a one-component high temperature resistant silicone sealant.

Embodiment 3

[0031] With α, ω-dihydroxypolymethylphenylsiloxane 30 kilograms, α, ω-dihydroxypolydiphenylsiloxane 60 kilograms, methyl vinyl two (N-methyl acetamido) silane 2.5 kilograms , fumed silica SiO 2 Add 15 kg into the planetary mixer, vacuumize, the vacuum degree is 0.09MPa, the speed is 35rpm, after stirring for 60 minutes, add cerium oxide CeO 2 5 kg, iron oxide Fe 2 o 3 15 kg, heated to 100°C and vacuumed, vacuum degree 0.09MPa, stirred for 60 minutes, then added 7.5 kg of vinyl tributylketoxime silane, 4 kg of methyl tributylketoxime silane, γ-chloropropyl triethyl 3 kg of oxysiloxane and 0.6 kg of dibutyltin diacetate were subjected to a chemical reaction at a vacuum of 0.09 MPa and a rotational speed of 35 rpm for 90 minutes to prepare a one-component high temperature resistant silicone sealant.

[0032] Names and technical indicators of main raw materials:

[0033] 1. α, ω-Dihydroxypolydiphenylsiloxane

[0034] Appearance: Colorless transparent viscous liquid, no mec...

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Abstract

The invention discloses a single-component high-temperature resistance silicon sealant, the formula ratio (weight by parts) comprises polysiloxane on dead end of hydroxyl group 90-110 parts, gas phased silicon dioxide SiO21-20 parts, high temperature-resistant filling material 20-100 parts, chain-extender 1-10 parts, cross linking agent 3-15 parts, catalyst 0.05-1 part and coupling agent 0.5-6 parts. The single-component high-temperature resistance silicon sealant has the advantages that first, phenyl group is led in a main chain of polysiloxane on the dead end of hydroxyl group, and high temperature-resistant filling material is added, high temperature-resistant property and low temperature-resistant property of high silicon sealant are obviously improved, second, chain-extender is led in, and elasticity of silicon sealant is improved.

Description

technical field [0001] The invention relates to an adhesive sealing material for automobile engines and chassis, in particular to a single-component high-temperature-resistant silicone sealant. technical background [0002] The bonding and sealing parts on the engine and chassis include: oil pan, rear axle housing, cylinder hole cover, transmission hole cover, etc. Its main function is to prevent the leakage of fuel, lubricating oil, water and gas. At present, the glue used for domestic engines and chassis is mainly polymer liquid sealant. For example: the liquid sealant successfully developed by Guangzhou Machine Tool Research Institute in the 1990s, its main component is chlorosulfonated polyethylene, which has excellent oil resistance and aging resistance. However, it contains a large amount of volatile organic solvents, which is not conducive to environmental protection; the volume shrinkage of the sealant caused by the volatilization of organic solvents often needs to ...

Claims

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Application Information

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IPC IPC(8): C09K3/10C09J183/04C09C3/12
Inventor 陈炳强梁银生陈炳耀张意田
Owner GUANGDONG SANVO CHEM IND TECH
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