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Modified perfluoroether fluororubber as well as preparation method and application thereof

A technology of perfluoroether and fluororubber, which is applied in the field of high temperature resistant modified perfluoroether fluororubber and its preparation. Good performance and processability, low hardness and low pressure change

Pending Publication Date: 2022-03-01
ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] CN 110713564 A discloses a synthesis method of wide temperature range perfluoroether rubber and the perfluoroether rubber, which uses tetrafluoroethylene and perfluoromethoxyethyl vinyl ether as comonomers, and is prepared by emulsion polymerization Perfluoroether rubber, and the vulcanization point monomer perfluoro-4-bromo-1-butene, perfluorobromoethyl vinyl ether, perfluoroiodoethyl vinyl ether, perfluoroiodoethyl vinyl ether, One or more of fluorine-4-iodo-1-butene, trifluoroiodoethylene or trifluorobromoethylene; select I(CF2)nI as the chain transfer agent, and the perfluoroether rubber obtained by this patent application can only Used in a high temperature environment below 250 °C, it cannot meet the requirements of higher operating temperature
[0004] CN 105820480 A discloses a high-temperature-resistant fluororubber and its preparation method, including the following components in mass percentage: fluororubber 2604 is 55-80%, active magnesium oxide is 1.0-3.0%, and bisphenol AF is 0.05-0.5% , tert-butyl peroxy pivalate is 0.5-2.0%, palm wax is 0.1-1.0%, WS280 is 0.2-1.0%, light stabilizer TBS (p-tert-butylphenyl salicylate) is 1.0-10.0 %, carbon black N990 is 15.0-30.0%, calcium hydroxide is 0.5-3.5%; the preparation method of high temperature resistant fluororubber comprises the following steps: first weigh each component; then mix; Three times, 2-3 triangular bags; finally, the film can be produced. The patent application adds various additives to the fluororubber to make the rubber have a certain high temperature resistance, but it still can only reach the high temperature resistance of 250 ℃, which cannot meet the requirements. higher temperature requirements

Method used

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  • Modified perfluoroether fluororubber as well as preparation method and application thereof
  • Modified perfluoroether fluororubber as well as preparation method and application thereof

Examples

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Effect test

preparation example 1

[0038] A kind of perfluoroether fluorine rubber emulsion, the preparation method is as follows:

[0039] (1) 30L of deionized water was added to a 50L reactor, the reactor was evacuated, and when its oxygen content was less than or equal to 30ppm, 35g of perfluorooctanoic acid ammonia was added and heated to 85°C.

[0040] (2) feed intake according to the mol ratio of tetrafluoroethylene and perfluoromethyl vinyl ether at 75:25, the reactor pressure is raised to 3.0MPa, and 15g potassium persulfate, 25g 1,2-diiodoperfluoroethyl ether are added. Alkane and 60g I(CF 2 ) 2 OCF=CF 2 , carry out the polymerization reaction, when the amount of the reacted monomers is 10kg, the reaction is terminated, the unreacted monomers are recovered, and the perfluoroether fluororubber emulsion is obtained.

preparation example 2

[0042] A kind of perfluoroether fluorine rubber emulsion, the preparation method is as follows:

[0043] (1) 30L of deionized water was added to a 50L reactor, the reactor was evacuated, and when its oxygen content was less than or equal to 30ppm, 50g of perfluorooctanoic acid ammonia was added and heated to 65°C.

[0044] (2) be 55:35 feed intake according to the mol ratio of tetrafluoroethylene and perfluoromethyl vinyl ether, the reactor pressure is raised to 3.5MPa, add 30g potassium persulfate, 50g 1,2-diiodoperfluoroethyl Alkane and 60g I(CF 2 ) 2 OCF=CF 2 , carry out the polymerization reaction, when the amount of the reacted monomers is 10kg, the reaction is terminated, the unreacted monomers are recovered, and the emulsion of perfluoroether fluororubber is obtained.

preparation example 3

[0046] A kind of perfluoroether fluorine rubber emulsion, the preparation method is as follows:

[0047] (1) 30L of deionized water was added to a 50L reactor, the reactor was evacuated, and when its oxygen content was less than or equal to 30ppm, 100g of perfluorooctanoic acid ammonia was added and heated to 90°C.

[0048] (2) feed intake according to the mol ratio of tetrafluoroethylene and perfluoromethyl vinyl ether as 65:35, the reactor pressure is raised to 2.8MPa, and 30g potassium persulfate, 10g 1,2-diiodoperfluoroethyl ether are added. Alkane and 60g I(CF 2 ) 2 OCF=CF 2 , carry out the polymerization reaction, when the amount of the reacted monomers is 10kg, the reaction is terminated, the unreacted monomers are recovered, and the perfluoroether fluororubber emulsion is obtained.

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Abstract

The invention provides modified perfluoroether fluororubber as well as a preparation method and application thereof. The modified perfluoroether fluororubber is prepared from the following raw materials: perfluoroether fluororubber and a polytetrafluoroethylene material, wherein the mass ratio of the perfluoroether fluororubber to the polytetrafluoroethylene is (70-95): (5-30). The modified perfluoroether fluororubber provided by the invention can resist high temperature of 300 DEG C, and can still meet the use requirements at the temperature of 300 DEG C; meanwhile, the hardness and the pressure change are relatively low, and the medium resistance and the processability are good.

Description

technical field [0001] The invention belongs to the technical field of rubber materials, relates to a modified perfluoroether fluororubber, a preparation method and application thereof, and particularly relates to a high temperature-resistant modified perfluoroether fluororubber and its preparation method and application. Background technique [0002] Fluorine rubber refers to a synthetic polymer elastomer containing fluorine atoms on the carbon atoms of the main chain or side chain. The introduction of fluorine atoms endows rubber with excellent heat resistance, oxidation resistance, oil resistance, corrosion resistance and atmospheric aging resistance. It has been widely used in aerospace, aviation, automobiles, petroleum and household appliances and other fields. An irreplaceable key material in industry. Among various fluororubbers, copolymers of tetrafluoroethylene (TFE) and perfluoroalkyl vinyl ether (PAVE) (PFA, also known as perfluoroether fluororubber) have heat re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/18C08F214/26C08F214/18C08F216/14
CPCC08L27/18C08F214/262C08L2201/08C08L2205/025C08F214/184C08F216/1408C08F2/26
Inventor 余金龙刘波钟子强张廷健肖忠良
Owner ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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