High tear resistance fluorosilicone rubber composition and preparation method thereof

A fluorosilicone rubber and tearing performance technology, applied in the rubber field, can solve the problems of easy structuring, difficult mixing of 4# fumed silica, and flying, etc., to improve the molding rate and excellent tear resistance. Effect

Active Publication Date: 2019-04-26
SHANDONG HUAXIA SHENZHOU NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent refers to the combination of fluororubber raw rubber and silicone rubber to obtain fluorosilicone rubber material. Because of the difference in structure, the two rubbers have certain differences in compatibility, which will easily lead to defects in the structure and performance of the product.
[0007] It is mentioned in the Chinese journal "Some Technical Development of Special Rubber" that for thermally vulcanized silicone rubber, 4# fumed silica is used instead of 2# fumed silica. The tear strength can generally be increased to 15k N.m-1, However, 4# fumed silica is difficult to mix, has a large amount of flying, and is easy to structure

Method used

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  • High tear resistance fluorosilicone rubber composition and preparation method thereof
  • High tear resistance fluorosilicone rubber composition and preparation method thereof
  • High tear resistance fluorosilicone rubber composition and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0038] The high tear-resistant fluorosilicone rubber composition has the following raw material parts by mass: 100 parts of raw fluorosilicone rubber with a molecular weight of 800,000 and a molecular weight distribution of 1.8; 40 parts of fumed silica with a specific surface area of ​​200; 3 parts of tetrafluoroethylene micropowder with a particle size of 25 microns; potassium titanate whiskers in ceramic whiskers are used as whiskers, with a diameter of 0.3 microns and a length of 10 microns, and the usage amount is 5 parts; the main vulcanizing agent is 2,5 - 0.8 part of dimethyl-2,5-di-tert-butyl peroxide hexane, 0.1 part of secondary vulcanizing agent 2,4-dichlorobenzoyl peroxide; 3 parts of structure control agent 100cp hydroxyfluorosilicone oil.

[0039] The preparation method is as follows:

[0040] 1) Add fluorosilicone rubber raw rubber, fumed silica, fluorine-containing resin micropowder, whiskers, and structure control agent in parts by mass to the internal mixer ...

Embodiment 2

[0043] The high-tear-resistant fluorosilicone rubber composition has the following mass parts of raw materials: 100 parts of raw fluorosilicone rubber with a molecular weight of 600,000 and a molecular weight distribution of 1.6; 60 parts of fumed silica with a specific surface area of ​​100; 5 parts of polyvinylidene fluoride micropowder with a particle size of 50 microns; silicon carbide whiskers in ceramic whiskers among inorganic whiskers, 0.4 microns in diameter, 15 microns in length, and 8 parts in dosage for the whiskers; mainly Vulcanizing agent dicumyl peroxide 1.0 parts, secondary vulcanizing agent 2,4-dichlorobenzoyl peroxide 0.1 part; structure control agent 200cp hydroxyfluorosilicone oil 5 parts.

[0044]The preparation method is the same as that of Example 1, except that: in step 1, the mixing temperature is 65° C., and the mixing time is 0.3 hours; heat treatment is performed in an oven at 150° C. for 2 hours; in step 2, thinning is performed 15 times.

Embodiment 3

[0046] The fluorosilicone rubber composition with high tear resistance performance has the following mass parts of raw materials: 100 parts of raw fluorosilicone rubber with a molecular weight of 1 million and a molecular weight distribution of 2.0; 60 parts of fumed silica with a specific surface area of ​​300 Particle diameter is 4 parts of polytetrafluoroethylene micropowder of 100 microns; Whisker uses the poly(4-hydroxybenzyl ester) whisker in organic whisker, and diameter is 0.6 micron, and length is 20 microns, and usage amount is 10 parts 1.2 parts of main vulcanizing agent di-tert-butyl peroxide, 0.1 part of secondary vulcanizing agent 2,4-dichlorobenzoyl peroxide; 4 parts of structure control agent 80cp hydroxyfluorosilicone oil.

[0047] The preparation method is as shown in Example 1, the difference is that in step 1, the mixing temperature is 70°C, the mixing time is 0.28 hours, and heat treatment is carried out in an oven at 160°C for 3 hours; in step 2, thin pass...

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Abstract

The invention relates to a high tear resistance fluorosilicone rubber composition and a preparation method of the composition and belongs to the technical field of rubber. The fluorosilicone rubber composition comprises the following substances in parts by mass: 100 parts of raw fluorosilicone rubber, 40-60 parts of fumed silica, 3-5 parts of fluororesin containing micropowder, 5-10 parts of whiskers, 0.5-1.5 parts of valcanizer and 3-5 parts of structure controller. The prepared fluorosilicone rubber composition has good tear resistance at room temperature and high temperature; and a formingrate of a product of the fluorosilicone rubber composition can be also increased. The invention further provides the preparation method of the composition. The preparation method comprises 2 steps, and is scientific, reasonable, simple and easy.

Description

technical field [0001] The invention relates to a fluorosilicone rubber composition with high tear resistance and a preparation method thereof, belonging to the technical field of rubber. Background technique [0002] Fluorosilicone rubber, also known as γ-trifluoropropylmethyl polysiloxane, is a side chain modified silicone elastomer. Products usually made of fluorosilicone rubber, in addition to the characteristics of general silicone rubber, also have excellent oil resistance characteristics, including fuel oil, engine oil, chemical reagents and solvents. Therefore, fluorosilicone rubber can well make up for the lack of oil resistance of ordinary silicone rubber, and can be called the "oil fighter" among silicone elastomers. Due to the excellent oil resistance of fluorosilicone rubber and the heat resistance of its silicone elastomer, this material is especially suitable for some applications that require high temperature resistance and fuel resistance, such as seals, ho...

Claims

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Application Information

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IPC IPC(8): C08L83/08C08L27/18C08L27/16C08K9/00C08K3/36C08K7/08C08K7/10C08K5/14C08K13/06
CPCC08L83/08C08L2201/08C08L2205/025C08L2205/03C08L2205/035C08L27/18C08L27/16C08K9/00C08K3/36C08K7/08C08K7/10C08K5/14C08K13/06
Inventor 岳广孟祥青徐凤伟王汉利
Owner SHANDONG HUAXIA SHENZHOU NEW MATERIAL
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