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High-hardness extruded silicone rubber composition and preparation method thereof

A silicone rubber composition and extrusion-type technology are applied in the field of high-hardness extrusion-type silicone rubber composition and its preparation, which can solve the problems of high vulcanization speed, affect the appearance of mixed rubber products, low decomposition temperature, etc., and achieve enhanced Effects of crosslinking density, suppression of secondary vulcanization hardness reduction, and elongation improvement

Active Publication Date: 2016-07-20
ZHEJIANG XINAN CHEM INDAL GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, the performance requirements for silicone rubber have been increasing, especially for silicone rubber with a temperature of 80 degrees and above that is suitable for industrial rubber rollers, pressure wheels, sealing rings, seals and other products, which require higher hardness and high resilience. Low compression set, at the same time, requires high elongation and tear resistance, so that there will be no cracks in the production process to ensure its pressure bearing capacity and service life. It is the most commonly used vulcanizing agent in the production of extruded silicone rubber. Its decomposition temperature is low and its vulcanization speed is fast; but the decomposition by-products of 2.4-dichlorobenzoic acid and 2.4-dichlorobenzene are not only toxic but also can cause Frosting of the product will affect the appearance of the mixed rubber product. During production, it is necessary to remove the decomposition products of the vulcanizing agent through two-stage vulcanization treatment.
However, the hardness, elongation and tear resistance of the silicone rubber in the prior art are reduced after the second-stage treatment, which cannot meet the requirements of use.

Method used

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  • High-hardness extruded silicone rubber composition and preparation method thereof
  • High-hardness extruded silicone rubber composition and preparation method thereof
  • High-hardness extruded silicone rubber composition and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 100 parts of methyl vinyl silicone rubber with an average molecular weight of 666,000 and an average vinyl content of 0.5% (40 parts of methyl vinyl silicone rubber with a molecular weight of 700,000 and a vinyl content of 0.03%, and ethylene with a molecular weight of 650,000 56 parts of methyl vinyl silicone rubber with a base content of 0.16%, molecular weight of 550,000, 4 parts of methyl vinyl silicone rubber with a vinyl content of 10.0%, 5 parts of hydroxyl silicone oil (viscosity at 25°C is 25mm 2 / s, the hydroxyl content is 8.5% (mass content)), 1 part of vinyl hydroxy silicone oil (viscosity at 25°C is 30mm 2 / s, the hydroxyl content is 6.0%, the vinyl content is 7.0% (mass content)), 3 parts of dimethyl dimethoxy silicone oil and other structural control agents and 0.08 parts of release agent stearic acid are put into preheating and heat preservation at one time In the kneader at 60°C for 1 hour, add the specific surface area of ​​180m2 in 8 times 2 / g, 75 p...

Embodiment 2

[0028] 100 parts of methyl vinyl silicone rubber with an average molecular weight of 663,000 and an average vinyl content of 0.54% (45 parts of methyl vinyl silicone rubber with a molecular weight of 680,000 and a vinyl content of 0.05%, a molecular weight of 680,000, vinyl 50 parts of methyl vinyl silicone rubber with a content of 0.23%, molecular weight of 600,000, 5 parts of methyl vinyl silicone rubber with a vinyl content of 8.0%, 4.5 parts of hydroxyl silicone oil (viscosity at 25°C is 25mm2 / s, hydroxyl The content is 8.5% (mass content)), 1 part of methylphenyldimethoxysilane, 2.5 parts of dimethyldiethoxy silicone oil and other structural control agents and 0.1 part of release agent zinc stearate once input In the kneader that is preheated and kept at 80°C for 1 hour, add it in 8 times with a specific surface area of ​​175m 2 73 parts of precipitated white carbon black YX813 (produced by Fujian Yuanxiang Co., Ltd.) with an average particle size of 1.5 μm, each componen...

Embodiment 3

[0031] 100 parts of methyl vinyl silicone rubber with an average molecular weight of 670,000 and an average vinyl content of 0.49% (50 parts of methyl vinyl silicone rubber with a molecular weight of 700,000 and a vinyl content of 0.03%, a molecular weight of 650,000, vinyl 45 parts of methyl vinyl silicone rubber with a base content of 0.50%, molecular weight of 550,000, 5 parts of methyl vinyl silicone rubber with a vinyl content of 5.0%, 4.0 parts of hydroxyl silicone oil (viscosity at 25°C is 25mm 2 / s, the hydroxyl content is 8.5% (mass content)), 2 parts of hexamethyldisilazane, 2.5 parts of dimethyldiethoxy silicone oil and other structural control agents and 0.06 parts of release agent calcium stearate Put it into the kneader that is preheated and kept at 60°C for 1 hour, and add it in 8 times with a specific surface area of ​​180m 2 / g, 60 parts of precipitated silica TMG (produced by Jilin Tonghua Co., Ltd.) with an average particle size of 1 μm, and a specific surfa...

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Abstract

The invention provides high-hardness extruded silicone rubber composition. The silicone rubber takes methyl vinyl siloxane with the average molecular weight of 0.55-0.75 million and the average vinyl molar content of 0.4-0.55% as rubber master batch, and reinforced white carbon black, silica powder, a structurized control agent, vinyl-terminated methyl vinyl silicone oil, an internal releasing agent, an anti-yellowing agent, magnesium oxide and cerium oxide are added. The prepared silicone rubber has high hardness, high resilience, relatively high elongation and high tear resistance after high temperature vulcanization and can be applicable to silicone products such as an industrial rubber-covered roller, a pressing wheel, a sealing ring and a sealing element.

Description

technical field [0001] The invention relates to a high-hardness extruded silicone rubber composition and a preparation method thereof. The silicone rubber has high hardness, high resilience, high elongation and tear resistance after being vulcanized at a high temperature, and can be applied to Industrial rubber rollers, pressure rollers, sealing rings, seals and other silicone miscellaneous parts. Background technique [0002] Due to its excellent heat resistance, cold resistance, environmental resistance, electrical insulation, low compression set and fatigue resistance, silicone rubber compounds have been widely used in electronics, electrical, Machinery manufacturing, chemical industry, food, daily necessities, medical and health and other fields. In recent years, the performance requirements for silicone rubber have been increasing, especially for silicone rubber with a temperature of 80 degrees and above that is suitable for industrial rubber rollers, pressure wheels, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/07C08L83/05C08L83/06C08K13/02C08K3/36C08K3/22C08K5/14B29C35/02
CPCB29C35/02C08K2201/003C08K2201/006C08K2201/014C08L83/04C08L2205/025C08L2205/035C08L83/06C08K13/02C08K3/36C08K5/14C08K2003/222C08K2003/2213
Inventor 詹学贵胡盛傅建勋江小牛谢江王鑫周汴香
Owner ZHEJIANG XINAN CHEM INDAL GROUP
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