Single-component heat-resisting silicon sealant

A silicone sealant, high temperature resistant technology, applied in other chemical processes, chemical instruments and methods, etc., can solve problems such as insufficient elastic recovery, local electrostatic accumulation hazards, affecting sealing performance, etc., to achieve low modulus, guarantee Safe and normal use, good product performance

Inactive Publication Date: 2011-04-20
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 has poor heat resistance when used in industries such as automobiles and machinery manufacturing.
Such as: can not withstand the working environment of the sealing part above 200 ℃ for a long time, or the working environment of the instantaneous temperature below 300 ℃
At the same time, the elastic recovery is not good enough, the elasticity decreases at low temperature, and the elastic fatigue is easy to occur after long-term use, which affects the sealing performance
At the same time, it is difficult to evaluate the effect of sealing silicone rubber seals by visual inspection. Pressure testing and disassembly must be used for seal evaluation, and the cost is relatively high.
Because the seal is mostly made of ordinary one-component room temperature vulcanized silicone rubber, it is easy to cause harm caused by local static electricity accumulation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 66.5 parts of α, ω-dihydroxy polydimethylsiloxane, 10 parts of silicon dioxide, 5 parts of cerium oxide, 5 parts of carbon nanotubes, 0.5 parts of color-changing pigments, Put 1 part of (N-methylacetamido) silane and 5 parts of zinc powder into a planetary mixer, and stir evenly at a vacuum degree ≤ 0.09Mpa; put 6.5 parts of vinyl tributylketoximosilane, 0.1 parts of n-butyltin dilaurate part, 0.4 part of γ-chloropropyltriethoxysilane, and stir in a vacuum degree ≤0.09Mpa to obtain a finished product.

Embodiment 2

[0032] 56.9 parts of α, ω-dihydroxy polydimethylsiloxane, 18 parts of iron oxide, 5 parts of bentonite, 4 parts of carbon nanotubes, 0.4 parts of color-changing pigments, 0.1 parts of phthalocyanine green, and Put 1 part of vinyl bis(N-methylacetamido)silane, 5 parts of copper powder, and 1 part of zinc powder into a planetary mixer, and stir evenly at a vacuum degree of ≤0.5Mpa; put in 4 parts of methyl tributylketoxime silane , 4 parts of vinyl tributylketoxime silane, 0.1 part of n-butyltin diacetate, 0.5 part of γ-isocyanatotrimethoxysiloxane, and stir in a vacuum degree ≤ 0.5Mpa to obtain a finished product.

Embodiment 3

[0034] 31 parts of α, ω-dihydroxy polydimethylsiloxane, 4 parts of mica powder, 2 parts of silicon dioxide, 3 parts of glass powder, 2 parts of graphite powder, 5 parts of calcium carbonate, oxidized Put 8 parts of iron, 12 parts of carbon nanotubes, 8 parts of volcanic ash, 0.5 parts of color-changing pigments, 0.5 parts of phthalocyanine blue, 1 part of methyl vinyl bis(N-methylacetamido) silane, and 10 parts of copper powder into the planetary mixer , Stir well at a vacuum degree of ≤0.3Mpa; put in 12 parts of methyl tributyl ketoxime silane, 0.1 part of n-butyl tin diacetate, and 0.9 parts of γ-isocyanatotrimethoxysiloxane, in a vacuum degree of ≤ Stir at 0.3Mpa to obtain a finished product.

[0035] Names and technical indicators of main raw materials:

[0036] 1. α, ω-Dihydroxypolymethylphenylsiloxane

[0037] Molecular formula: HO(MePhSiO) n H, n=50~2200,

[0038] Appearance: Colorless transparent viscous liquid, no mechanical impurities

[0039] Viscosity (25°C, m...

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PUM

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Abstract

The invention discloses a single-component heat-resisting silicon sealant, which has the following components: alpha, omega-dihydroxy polydimethyl siloxane, stuffing, heat-resisting reinforcing agent, irreversible temperature showing agent, vinyl methyl silane (N-methyl acetamido), metal heat dissipation electricity conduction agent, cross-linking agent, catalyst and coupling agent. The silicon sealant has the advantages that heat-resisting property is good; an irreversible temperature indicating agent is used as an over-temperature warning agent; the seal effectiveness of the seal part is monitored by using a simple visual inspection method; colloid elasticity and low-temperature resistance are excellent; a metal heat dissipation electricity conduction agent is used, thereby lowering the decreased seal property generated by partial heat accumulation and the damage generated by partial static accumulation; and the modulus is low, and the product using property is good.

Description

technical field [0001] The invention relates to a polymer material that can be used in high temperature environment, which belongs to low modulus one-component room temperature vulcanized silicone rubber; it is mainly used in chemical industry, automobile industry, machinery and other manufacturing industries that require temperature resistance and chemical resistance Sealing, specifically a one-component high temperature resistant silicone sealant. Background technique [0002] With the progress of society, the chemical industry, automobile industry, machinery and other manufacturing industries have developed rapidly, which has also led to the development of related sealant industries. At present, the commonly used heat-resistant and chemical-resistant sealants in the manufacturing industry are sealants with various rubber as the main body. Such as: sealing parts on the engine and chassis, oil pan, rear axle housing, cylinder hole cover, transmission hole cover, etc.; the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/06C08K13/06C08K9/06C08K7/00C08K3/04C08K3/00C08K5/5455C09K3/10
Inventor 陈炳耀梁银齐张秋明
Owner GUANGDONG SANVO CHEM IND TECH
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