High heat resistant, fast setting, neutral deacetone type room temperature vulcanization silicon rubber and its preparation method

A technology of room temperature vulcanization and silicone rubber, applied in the field of preparation of room temperature vulcanized silicone rubber materials, can solve the problems of slow vulcanization speed, difficult general industrial use requirements, and high use cost, achieve good tensile strength and elongation, and speed up vulcanization. , the effect of good heat resistance

Active Publication Date: 2007-02-14
GUANGZHOU BAIYUN CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In China, the Institute of Chemistry of the Chinese Academy of Sciences has developed room temperature vulcanized silicone rubber with silicon nitrogen polymer as the crosslinking system for military applications. It can withstand 350°C in vacuum or nitrogen environment, but the disadvantage is that it can only be prepared as two components. , not suitable for the preparation of convenient one-component room temperature vulcanized silicone rubber, if the prepared two-component room temperature vulcanized silicone rubber does not use an organotin catalyst, the vulcanization speed is relatively slow, and it is difficult to apply to the requirements of general industry
[0006] In addition, the Nanjing University system glue developed by Nanjing University has been applied since the 1970s, and played an important role in past industrial applications, solving the technical application problem of fast solidification, but its inherent chemical mechanism makes it impossible to achieve A higher level of fast curing and heat resistance (250 ~ 300 ℃) level
[0007] In foreign countries, Shin-Etsu Corporation of Japan has developed acetone-free room temperature vulcanized silicone rubber KE3417 and KE3418, which have a wide range of applications, neutral curing, and fast curing. They have achieved important applications in civilian commercialization, but they are very expensive and expensive to use. widely used
[0008] At present, there is no domestic research report on neutral acetone-free room temperature vulcanized silicone rubber with high heat resistance, fast curing, and wide application range. The heat-resistant room temperature vulcanized silicone rubber used in electronics, automobiles, machinery and other industries on the market is adhesive. Agents, mainly imported products, are expensive and costly to use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In a 2-liter planetary mixer, first add 10 parts of iron oxide red and α, ω-dihydroxypolydimethylsiloxane according to a 1:1 mixture, and then add 100 parts of α, ω-dihydroxypolydimethylsiloxane Siloxane (viscosity of 10000mPa.s) and 15 parts of hydroxyl-terminated polydimethylsiloxane (viscosity of 500mPa.s), vacuum stirring for 20 ~ 30min (vacuum degree of -0.098Mpa or more), and then 12 parts Add fumed silica whose surface has been treated with hexamethyldisilazane, start the machine and stir. After the white carbon black powder is completely mixed into the glue, stop the machine and shovel the edge, and vacuumize and stir for 20 to 30 minutes (the vacuum degree is above -0.098Mpa) ), and then add 7 parts of methyl tris (isopropenyloxy) silane, 0.8 parts of N-(β-aminoethyl)-γ-aminopropyl trimethoxysilane and 0.8 parts of (tetramethylguanidino) Propyltriethoxysilane, vacuumize and stir for 30-50min (vacuum degree is above -0.098Mpa), stop the machine and discharge, th...

Embodiment 2

[0035] In a 2-liter planetary mixer, first add 15 parts of iron oxide red and α, ω-dihydroxypolydimethylsiloxane according to a 1:2 mixture, then add 100 parts of α, ω-dihydroxypolydimethylsiloxane Siloxane (viscosity of 15000mPa.s) and 10 parts of hydroxyl-terminated polydimethylsiloxane (viscosity of 1000mPa.s), vacuum stirring for 20 to 30min (vacuum degree of -0.098Mpa or more), and then 10 parts Add fumed silica whose surface has been treated with hexamethyldisilazane, start the machine and stir. After the white carbon black powder is completely mixed into the glue, stop the machine and shovel the edge, and vacuumize and stir for 20 to 30 minutes (the vacuum degree is above -0.098Mpa) ), and then add 7 parts of chloromethyl tris (isopropenyloxy) silane, 0.8 parts of γ-methacryloxypropyl trimethoxysilane and 0.8 parts of (tetramethylguanidino) propyl trimethoxy base silane, vacuum and stir for 30-50 minutes (vacuum degree is above -0.098Mpa), stop the machine and discharge...

Embodiment 3

[0037]In a 2-liter planetary mixer, first add 15 parts of cerium-rich mixed rare earth oxide and α, ω-dihydroxy polydimethylsiloxane according to a 1:1.5 mixture, and then add 100 parts of α, ω-dihydroxy Polydimethylsiloxane (viscosity of 20000mPa.s) and 10 parts of hydroxyl-terminated polydimethylsiloxane (viscosity of 200mPa.s), vacuum stirring for 20 to 30min (vacuum degree of -0.098Mpa or more), Then add 10 parts of fumed silica whose surface has been treated with hexamethyldisilazane, start the machine and stir, and after the white carbon black powder is completely mixed into the glue, stop the machine and shovel the edge, and vacuumize and stir for 20 to 30 minutes (the vacuum degree is -0.098Mpa or more), then add 7.5 parts of tetra(isopropenoxy) silane, 0.7 parts of γ-(2,3 glycidoxy) propyltrimethoxysilane and 0.7 parts of (tetramethylguanidino) Propyltriethoxysilane, vacuumize and stir for 30-50min (vacuum degree is above -0.098Mpa), stop the machine and discharge, th...

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Abstract

The present invention discloses one kind of heat resistant, fast cured, neutral acetone-eliminating room temperature vulcanized silicone rubber and its preparation process. The silicone rubber consists of alpha, omega-dihydroxy dimethyl siloxane 80-120 (in weight portions, the same below), hydroxyl radical terminated polydimethyl siloxane 10-20, silica 10-15, tackifier 0.5-1.5, heat resisting additive 5-15, organic guanidine catalyst 0.5-0.9, and acetone-eliminating siloxane cross-linking agent 5-8. The acetone-eliminating room temperature vulcanized silicone rubber has fast vulcanizing, easily completed cross-linking reaction, no need of using organic metal compound as catalyst, high heat resistance, high electrically insulating performance, high strength, high storing stability, wide adhering application range, and other advantages.

Description

technical field [0001] The invention relates to a room temperature vulcanized silicone rubber material, and also relates to a preparation method of the room temperature vulcanized silicone rubber material. Background technique [0002] Silicone rubber is widely used in aviation, electronics, automobiles, machinery, instruments, medical and health and daily life due to its excellent properties such as high and low temperature resistance, weather resistance, moisture resistance, radiation resistance, electrical insulation, and biological inertness. Ordinary silicone rubber can be used for a long time in the temperature range of -60°C to 200°C, which is unmatched by other organic rubbers. However, with the development of modern science and technology, higher requirements are put forward for the heat resistance of silicone rubber. For example: modern electronics and electrical appliances are developing in the direction of high power, small size and high reliability. In many occa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/14C08K9/06C08J3/24C08K5/5415
Inventor 温茂添欧阳喜仁陈建军陈思斌诸泉吴向荣
Owner GUANGZHOU BAIYUN CHEM IND
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