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High-strength, thermo-oxidative-aging-resistant and insulating silicone rubber and preparation method thereof

A high-strength, insulating silicon technology, applied in the field of silicone rubber, can solve the problems of easy agglomeration, affect the mechanical properties and electrical insulation properties of dispersive silicone rubber, achieve simple modification process, improve mechanical properties and resist thermal oxidation aging Performance, good filling effect

Inactive Publication Date: 2017-01-04
YICHANG XINGZHIXIN PLASTIC ELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the excessive addition of aluminum hydroxide, it is easy to agglomerate, which affects its dispersion and the mechanical properties and electrical insulation properties of silicone rubber.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The present invention proposes a preparation method of high-strength heat-resistant oxygen aging insulating silicone rubber, comprising the following steps:

[0027] 1) Aluminum hydroxide modification: take aluminum hydroxide (median particle size 2 μm) according to the mass ratio of 2:4:4; aluminum hydroxide (median particle size 3 μm); aluminum hydroxide (median particle size 4 μm) and Mix, then add KH-560 with 1% of the total mass of aluminum hydroxide for modification, wherein the modification conditions are stirring speed 1000r / min, temperature 70°C, and stirring time 60min to obtain modified aluminum hydroxide;

[0028] 2) Calcium carbonate modification: take the specific surface area as 50m 2 A suitable amount of nano-calcium carbonate per g, then add stearic acid of 0.5% of the quality of nano-calcium carbonate to modify, wherein the modification conditions are stirring speed 1000r / min, temperature 60°C, stirring time 60min, to obtain modified nano-calcium carbo...

Embodiment 2

[0033] 1) Aluminum hydroxide modification: take aluminum hydroxide (median particle size 2 μm) according to the mass ratio of 4:2:4; aluminum hydroxide (median particle size 3 μm); aluminum hydroxide (median particle size 4 μm) and Mix, then add KH-570 with 2% of the total mass of aluminum hydroxide for modification, wherein the modification conditions are stirring speed 1000r / min, temperature 80°C, stirring time 75min, to obtain modified aluminum hydroxide;

[0034] 2) Calcium carbonate modification: take the specific surface area as 65m 2 The nano-calcium carbonate of / g is suitable, then adds the lauric acid of nano-calcium carbonate quality 1% and modifies, and wherein modification condition is stirring speed 1000r / min, temperature 70 ℃, stirring time 75min, obtains modified nano-calcium carbonate;

[0035] 3) Modification of white carbon black by gas phase method: take the specific surface area as 175m 2 An appropriate amount of fumed silica per gram, and then add polyet...

Embodiment 3

[0039]1) Aluminum hydroxide modification: take aluminum hydroxide (median particle size 2 μm) according to the mass ratio of 4:4:2; aluminum hydroxide (median particle size 3 μm); aluminum hydroxide (median particle size 4 μm) and Mixing, and then adding vinyltrimethoxysilane of 3% of the total mass of aluminum hydroxide for modification, wherein the modification conditions are a stirring speed of 1000r / min, a temperature of 90°C, and a stirring time of 90 minutes to obtain modified aluminum hydroxide;

[0040] 2) Calcium carbonate modification: take the specific surface area as 80m 2 A suitable amount of nano-calcium carbonate per g, then add oleic acid of 1% of the quality of nano-calcium carbonate to modify, wherein the modification conditions are stirring speed 1000r / min, temperature 80°C, stirring time 90min, to obtain modified nano-calcium carbonate;

[0041] 3) Modification of silica by gas phase method: take the specific surface area as 200m 2 A suitable amount of fum...

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Abstract

The invention provides high-strength, thermo-oxidative-aging-resistant and insulating silicone rubber and a preparation method thereof. The preparation method includes the following steps of aluminum hydroxide modification, wherein aluminum hydroxide of different grain diameters is mixed according to a certain proportion, and then surfactant is added for modification; calcium carbonate modification; fumed silica modification; mixing; discharging, remilling and straining to complete preparation of the high-strength, thermo-oxidative-aging-resistant and insulating silicone rubber. Aluminum hydroxide of different grain diameters is mixed, a better filling effect is achieved on gaps between molecular chains of silicone rubber raw rubber, cost is lower, the compatibility is further improved through modification, clustering is reduced, and the electrical insulation property and the flame-retardant property of the silicone rubber are guaranteed; nano calcium carbonate and fumed silica are modified, the silicone rubber has a better dispersion effect, the filling effect is improved accordingly, the mechanical performance and thermo-oxidative-aging-resistant performance of the silicone rubber are remarkably improved, the modification process is simple, and cost is low.

Description

technical field [0001] The invention relates to the field of silicone rubber, in particular to a high-strength heat-resistant oxygen aging insulating silicone rubber and a preparation method thereof. Background technique [0002] Silicone rubber refers to the rubber whose main chain is composed of silicon and oxygen atoms alternately. There are usually two organic groups attached to the silicon atom. The main varieties are: dimethyl silicone rubber, methyl vinyl silicone rubber, methyl phenylethylene Silicone rubber, nitrile silicone rubber, phenylene silicone rubber and phenylene ether silicone rubber. Methyl vinyl silicone rubber is referred to as vinyl silicone rubber for short. Because it contains a small amount of vinyl side chains, compared with dimethyl silicone rubber, it can significantly improve the resistance to compression set. The low compression deformation reflects its role as The seal has better support at high temperature, which is one of the must-have requ...

Claims

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Application Information

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IPC IPC(8): C08L83/07C08L83/05C08L83/06C08K9/06C08K3/22C08K9/04C08K3/26C08K9/08C08K3/36
CPCC08K2201/003C08K2201/006C08K2201/011C08K2201/014C08L83/04C08L2201/02C08L2201/08C08L2205/025C08L2205/035C08L83/06C08K9/06C08K2003/2227C08K9/04C08K2003/265C08K9/08C08K3/36
Inventor 徐海露陈海平李恩苗刚党瑞东王谦
Owner YICHANG XINGZHIXIN PLASTIC ELECTRONICS TECH CO LTD
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