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Heat-resistant agent, high-temperature-resistant silicone rubber and preparation method thereof

A high-temperature-resistant silicone rubber and heat-resistant agent technology, which is applied in the field of silicone rubber, can solve the problems of poor compatibility between heat-resistant agent and silicone rubber, adverse effects on mechanical properties such as hardness, and easy loss of high-temperature elasticity, etc. Modulus, good elasticity and mechanical properties, and the effect of improving processing performance

Active Publication Date: 2022-03-04
ZHEJIANG XINAN CHEM INDAL GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004]The commonly used heat-resistant additives are mainly metal oxides, which can keep silicone rubber in good performance within a certain temperature range (less than 350°C), but beyond this range Silicone rubber will break the main chain or oxidize the side groups, the mechanical properties will be reduced, and the compatibility between the heat-resistant agent and silicone rubber will become poor, which will affect the performance
Silicone resin can improve the temperature resistance of silicone rubber, but the improvement is limited, and it has adverse effects on mechanical properties such as hardness
The introduction of phenyl raw rubber can improve the heat resistance of silicone rubber to a certain extent, but the high price limits the application. CN111909525 A uses diphenylsilanediol instead of common structural control agent, and adds methylphenylvinyl silicone oil , after 300℃*3d aging, the retention rate is 45.6%, the temperature resistance level is insufficient, and the high temperature elasticity is easy to lose
CN109867965A adopts boron heat-resistant agent to study the aging situation of silicone rubber at high temperature, but the mass loss is relatively large
CN111073057B uses nano-zirconium hydroxide, nano-yttrium oxide and hexaphenylcyclotrisilazane to match, and the quality loss is relatively large after aging

Method used

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  • Heat-resistant agent, high-temperature-resistant silicone rubber and preparation method thereof
  • Heat-resistant agent, high-temperature-resistant silicone rubber and preparation method thereof
  • Heat-resistant agent, high-temperature-resistant silicone rubber and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0044] The average molecular weight is 689,000, and the average vinyl content is 100 parts of methyl vinyl silicone rubber raw rubber of 0.168mol% (wherein the molecular weight is 700,000 vinyl content of 0.05mol% methyl vinyl silicone rubber raw rubber 65 33 parts of methyl vinyl silicone rubber with a molecular weight of 680,000 and a vinyl content of 0.23 mol%, 2 parts of a methyl vinyl silicone rubber with a molecular weight of 500,000 and a vinyl content of 3 mol%, 47 parts of fumed silica (XHG-300, Zhejiang Kaihua Synthetic Materials Co., Ltd.), 2.0 parts of hydroxyl silicone oil (viscosity of 25mm at 25°C 2 / s, hydroxyl content is 8.5wt%), 1.5 parts of hexamethyldisilazane (content ≥ 99%), 1.5 parts of vinyl hydroxy silicone oil ((viscosity (25 ° C), mm 2 / s: 35, hydroxyl content: (mol%) 6.0, vinyl content: (mol%) 7.0)), 1.0 parts of methylphenyldimethoxysilane (HY-PS-9116, Hangyu Technology Product Center) , 0.1 part of zinc stearate (Hangzhou Oleochemical Co., Ltd.), ...

Embodiment 2

[0048] The average molecular weight is 682,000, and the average vinyl content is 100 parts of methyl vinyl silicone rubber raw rubber of 0.226mol% (wherein the molecular weight is 680,000 vinyl content of 0.08mol% methyl vinyl silicone rubber raw rubber 50 parts 48.2 parts of methyl vinyl silicone rubber with a molecular weight of 700,000 and a vinyl content of 0.20 mol%, 1.8 parts of a methyl vinyl silicone rubber with a vinyl content of 5 mol% and a molecular weight of 500,000), 40 parts of fumed silica (HL-200, Yichang Huifu Silicon Material Co., Ltd.), 0.5 parts of hydroxyl silicone oil (viscosity at 25 °C is 25mm 2 / s, hydroxyl content is 8.5wt%), 0.6 parts of hexamethyldisilazane (content ≥ 99%), 2.0 parts of vinyl hydroxy silicone oil ((viscosity (25 ° C), mm 2 / s: 35, hydroxyl content: (mol%) 6.0, vinyl content: (mol%) 7.0)), 2.0 parts of methylphenyldiethoxysilane (Hubei Xinghengye Technology Co., Ltd.), 0.08 parts of hard Fatty acid (Hangzhou Oil Chemical Co., Ltd.)...

Embodiment 3

[0052] The average molecular weight is 685,000, and the average vinyl content is 100 parts of methyl vinyl silicone rubber raw rubber of 0.235mol% (wherein the molecular weight is 700,000 vinyl content of 0.05mol% methyl vinyl silicone rubber raw rubber 59 37 parts of methyl vinyl silicone rubber with a molecular weight of 680,000 and a vinyl content of 0.23 mol%, 4 parts of a methyl vinyl silicone rubber with a molecular weight of 500,000 and a vinyl content of 3 mol%, 42 parts of fumed silica (Tokuyama QS-25, Japan Tokuyama Co., Ltd.), 1.0 parts of hydroxyl silicone oil (viscosity at 25°C is 25mm 2 / s, hydroxyl content is 8.5wt%), 0.9 parts of hexamethyldisilazane (content ≥ 99%), 1.0 parts of vinyl hydroxy silicone oil ((viscosity (25 ° C), mm 2 / s: 35, hydroxyl content: (mol%) 6.0, vinyl content in mole percent: (mol%) 7.0)), 1.5 parts of methylphenyldimethoxysilane (HY-PS-9116, Hang Yu Science and Technology Product Center), 0.1 part of calcium stearate (Hangzhou Oil Che...

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Abstract

The invention relates to the technical field of silicone rubber, in particular to a heat-resistant agent which is prepared from the following components in percentage by mass: 2-10% of yttrium oxide, 3-15% of zirconium oxide, 25-40% of cerium oxide, 50% of methyl vinyl silicone rubber raw rubber and 5-18% of titanium oxide. The invention further relates to high-temperature-resistant silicone rubber. The high-temperature-resistant silicone rubber is prepared from raw methyl vinyl silicone rubber and the heat-resistant agent. The novel heat-resistant agent disclosed by the invention has good dispersity in the silicone rubber, not only retains the original performance of the silicone rubber, but also enables the aged silicone rubber to have good elasticity and mechanical properties, can be normally used at a high temperature of 350 DEG C, meets the use requirements under some harsh conditions, and widens the application field.

Description

technical field [0001] The invention relates to the technical field of silicone rubber, in particular to a heat-resistant agent, high-temperature-resistant silicone rubber and a preparation method thereof. Background technique [0002] The main chain of silicone rubber is composed of Si-O-Si bonds. It is one of the most important products of polysiloxane. It has excellent heat resistance, cold resistance, oil resistance, chemical resistance, radiation resistance, water vapor resistance and Air permeability, etc., are widely used in various fields such as aviation, aerospace, electrical, automobile, machinery and other industries, medical and health, and daily life. [0003] The heat resistance of silicone rubber is better than that of organic rubber. It can maintain good physical and mechanical properties at 150°C, and the continuous time at 200°C is more than 1000h, but it is easy to become brittle and fracture at 350°C. With the development of science and technology, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/07C08L83/04C08K3/22C08K7/26C08K5/14
CPCC08L83/04C08L2201/08C08K2003/221C08K2003/2244C08K2003/2213C08K2003/2241C08K3/22C08K7/26C08K5/14
Inventor 詹学贵张红岩陈京胡盛刘洋洋沃雪亮戴守卫
Owner ZHEJIANG XINAN CHEM INDAL GROUP
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