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Oil-resistant fluorinated silicone rubber and preparation method thereof

A fluorosilicone rubber and oil-resistant technology, which is applied in the field of oil-resistant fluorosilicone rubber and its preparation, can solve the problems of large swelling rate, increased cost, and increased dosage of vulcanizing agent, etc., to achieve improved oil resistance, improved dispersion and compatibility, The effect of excellent mechanical strength

Active Publication Date: 2014-04-02
XIAN SUNWARD AEROSPACE MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this regard, if a structure control agent such as diphenylsilanediol is used, heat treatment must be carried out, which increases the complexity and instability of the process; if heat treatment is not carried out, the amount of vulcanizing agent needs to be increased to avoid delays Vulcanization, which again increases the cost
[0005] Although fluorosilicone rubber manufactured by traditional technology has certain resistance to non-polar solvents, fuel oil and mineral oil, the swelling rate is still relatively large after long-term high-temperature immersion

Method used

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  • Oil-resistant fluorinated silicone rubber and preparation method thereof
  • Oil-resistant fluorinated silicone rubber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Step 1, adding alumina powder and polyethylene glycol to distilled water to make a dispersion with a mass percentage of alumina of 5%, and then mixing the n-butanol solution of coconut oleic acid with the alumina dispersion at a ratio of 1:10 After mass ratio mixing, azeotropic distillation is carried out under stirring conditions, the filter cake is washed, and then ultrasonically dispersed in absolute ethanol until the absolute alcohol is completely volatilized, then dried and ground to obtain modified alumina powder; the alumina The mass ratio of powder and Polyethylene Glycol is 100:1; In the n-butanol solution of described coconut oleic acid, the mass ratio of coconut oil and n-butanol is 1:20;

[0029] Step 2: Mix 100g of fluorosilicone rubber LS4-9060, 10g of N990 carbon black, 60g of modified alumina powder and 0.03g of stearic acid in step 1 on the open mill, and cool to At room temperature, the masterbatch was obtained; the mixing temperature was 120°C, and th...

Embodiment 2

[0032] The present embodiment is the same as Example 1, wherein the difference is that the carbon black used is spray carbon black, and the vulcanizing agent used is dicumyl peroxide, benzoyl peroxide, 2,4-dichlorobenzoyl peroxide acyl or di-tert-butyl peroxide cumene.

Embodiment 3

[0034] Step 1, adding alumina powder and polyethylene glycol into distilled water to make a dispersion with a mass percent content of alumina of 8%, and then mixing the n-butanol solution of coconut oleic acid with the alumina dispersion at a ratio of 1:10 After mass ratio mixing, azeotropic distillation is carried out under stirring conditions, the filter cake is washed, and then ultrasonically dispersed in absolute ethanol until the absolute alcohol is completely volatilized, then dried and ground to obtain modified alumina powder; the alumina The mass ratio of powder and Polyethylene Glycol is 100:1; In the n-butanol solution of described coconut oleic acid, the mass ratio of coconut oil and n-butanol is 1:20;

[0035] Step 2: Mix 100g of fluorosilicone rubber LS4-9060, 3g of sprayed carbon black, 30g of modified alumina powder and 0.01g of stearic acid in Step 1 on an open mill, and then cool down to At room temperature, the masterbatch was obtained; the mixing temperature...

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Abstract

The invention discloses oil-resistant fluorinated silicone rubber which is prepared by the following raw materials in parts by weight: 100 parts of fluorinated silicone rubber, 3-15 parts of carbon black, 30-100 parts of modified alumina powder, 0.01-0.05 parts of internal releasing agent, and 0.5-3 parts of vulcanizing agent. According to the oil-resistant fluorinated silicone rubber, the carbon black serves as a reinforcing agent and substitutes the traditional white carbon black and structural control agent system, and heat treatment is not required in a mixing process, so that a technology is simplified greatly, the lost is lowered, and a quality unstabilizing factor is reduced. The alumina powder subjected to coconut fatty acid surface treatment is adopted, and the surface of alumina changes from hydrophilicity to hydrophobicity, so that the dispersity and the compatibility of alumina in the fluorinated silicone rubber are improved effectively; alumina occupies the original space of a rubber matrix molecular chain, so that a rubber molecular chain segment is immobilized to some extent; and movement of a molecular chain in a polymer boundary zone is limited and the rubber molecular chain segment cannot be sufficiently contacted with an oil material, so that the oil resistance of vulcanized rubber is improved greatly.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to an oil-resistant fluorosilicone rubber and a preparation method thereof. Background technique [0002] Fluorosilicone rubber is a modified silicone rubber, that is, a fluorine-containing group (such as trifluoropropyl group) is introduced into the siloxane side chain of the silicone rubber. Because the fluorine atom has a great electron-withdrawing effect, and the C-F bond The short bond length can form a good shielding effect on the C-C bond, greatly improving the oil resistance and solvent resistance of the rubber, making it widely used in rubber products such as automotive and aircraft diaphragms, gaskets, sealing rings and sealants. . [0003] There are many types of fluorosilicone rubber. At present, the fluorosilicone rubber produced on a large scale is synthesized from carbon tetrafluoride and ethylene as starting materials. It can be synthesized fro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/08C08K13/06C08K9/04C08K3/22C08K3/04C08K5/09C08K5/14B29C35/02
Inventor 冀建波袁江龙刘洋郭建
Owner XIAN SUNWARD AEROSPACE MATERIAL CO LTD
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