Conductive fluorosilicone sealant and preparation method thereof

A sealant and fluorosilicon technology, applied in the field of fluorosilicon sealant and its preparation, can solve the problems of low temperature resistance grade of epoxy rubber, prone to degradation reaction, limited application scope, etc., to improve high temperature resistance performance and deep curing. Good, expand the effect of the application field

Inactive Publication Date: 2018-04-20
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the work carried out on conductive sealants mainly uses silicone rubber and epoxy rubber as the base material. The disadvantages are: first, silicone rubber is prone to degradation reactions in fuel and other media; second, epoxy rubber is resistant to temperature Lower grade, easy to harden, limiting the scope of application

Method used

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  • Conductive fluorosilicone sealant and preparation method thereof
  • Conductive fluorosilicone sealant and preparation method thereof
  • Conductive fluorosilicone sealant and preparation method thereof

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Experimental program
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preparation example Construction

[0024] A preparation method of a conductive fluorosilicon sealant, preparing the conductive fluorosilicon sealant as described above, characterized in that the steps of preparation are as follows:

[0025] 1. Preparation of component A:

[0026] 1.1. Ingredients: Weigh liquid fluorosilicone rubber, conductive filler, reinforcing agent, heat-resistant agent, methyl fluorosilicone oil, and coupling agent in component A in proportion;

[0027] 1.2. Coarse mixing: use a three-roll mill to mix liquid fluorosilicone rubber, conductive filler, reinforcing agent, heat-resistant agent, and methyl silicone oil three times until uniform;

[0028] 1.3. Stirring: Put the ground mixture into a planetary mixer, add coupling agent in proportion, stir, set the speed at 500 rpm to 1000 rpm, stir for 30 minutes to 60 minutes, and obtain component A;

[0029] 2. Preparation of component B:

[0030] 2.1. Ingredients: Weigh the vulcanizing agent and catalyst in component B in proportion;

[0031...

Embodiment 1

[0034] The composition formula of the medium-resistant and high-temperature-resistant conductive fluorosilicon sealant is shown in Table 1:

[0035] Table 1 Formula composition of medium-resistant and high-temperature-resistant conductive fluorosilicon sealant

[0036]

[0037] The volume resistivity of the test piece prepared by using this compound is 2.3×10 -3 Ω cm, the tensile strength is 1.21MPa, and the elongation at break is 148%; after the heat-resistant treatment at 200℃*24h, its appearance has not changed, and its volume resistivity is 3.1×10 -2 Ω·cm, the mechanical properties decreased slightly, the tensile strength was 1.08MPa, and the elongation at break was 109%; the sample did not become viscous after being resistant to 95# aviation gasoline at 60°C for 7d.

Embodiment 2

[0039] The composition formula of the medium-resistant and high-temperature-resistant conductive fluorosilicon sealant is shown in Table 2:

[0040] Table 2 Formula composition of medium-resistant and high-temperature-resistant conductive fluorosilicon sealant

[0041]

[0042]

[0043] The volume resistivity of the test piece prepared by using this rubber formula is 5.2×10 -3 Ω cm, the tensile strength is 1.04MPa, and the elongation at break is 179%; after the heat-resistant treatment at 200℃*24h, its appearance has not changed, and its volume resistivity is 4.9×10 -2 Ω·cm, the mechanical properties decreased slightly, the tensile strength was 0.87MPa, and the elongation at break was 147%; the sample did not become viscous after being resistant to 95# aviation gasoline at 60°C for 7d.

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Abstract

The invention belongs to the technical field of sealant preparation, and relates to a fluorosilicone sealant with conduction performance and a preparation method thereof. The fluorosilicone sealant isprepared from an ingredient A and an ingredient B, wherein the ingredient A is prepared from hydroxy-terminated liquid fluorosilicone rubber, conductive fillers, reinforcing agents, heat-resistant agents, coupling agents and methyl fluorosilicone oil; the ingredient B is prepared from a vulcanizing agent and a catalyst. The steps for preparing the ingredient A include material preparation, roughly mixing and stirring; the steps for preparing the ingredient B include material preparation and mixing. The fluorosilicone sealant with conduction performance and the preparation method of the fluorosilicone sealant provided by the invention have the advantages that the medium resistant and temperature resistant grades of the conductive sealant are improved; the degree of degradation reaction generated in media such as fuel oil is weakened; the high-temperature-resistant performance is improved.

Description

technical field [0001] The invention belongs to the technical field of sealant preparation, and relates to a conductive fluorosilicon sealant and a preparation method thereof. technical background [0002] Conductive sealant, as a polymer material with both conductive and sealing and bonding functions, can be used to eliminate static electricity between electronic devices and improve anti-electromagnetic interference performance. Conductive sealant not only has high temperature and medium resistance, but also has high electrical conductivity. At present, the work carried out on conductive sealants mainly uses silicone rubber and epoxy rubber as the base material. The disadvantages are: first, silicone rubber is prone to degradation reactions in fuel and other media; second, epoxy rubber is resistant to temperature The grade is low and easy to harden, which limits the scope of application. Contents of the invention [0003] The purpose of the present invention is to provi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/08C08K13/06C08K9/10C08K3/08C08K13/02C08K3/04
CPCC08K2003/0862C08K2201/001C08K2201/011C08L83/08C08L2201/08C08L2205/025C08K13/06C08K9/10C08K3/08C08K13/02C08K3/04
Inventor 于美超章谏正吴松华
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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