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Low-temperature-resistant perfluoroether rubber and synthesis method thereof

A technology of perfluoroether rubber and synthesis method, which is applied in the field of polymer materials, can solve the problems of low reactivity of comonomers, incapable of large-scale commercial production, slow polymerization speed, etc., and achieve good chemical medium resistance and good vulcanization performance, easy operation

Active Publication Date: 2015-04-22
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

Studies by Tatemoto et al. have shown that the glass transition temperature of TFE and CF2=CF-o-(CF2-CF(CF3))n-o-C3F7 (wherein N=1~3) high molecular copolymer is about -30 ℃, but the copolymerization single The low reactivity and slow polymerization rate of the body make this material unable to be produced commercially in large quantities

Method used

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  • Low-temperature-resistant perfluoroether rubber and synthesis method thereof
  • Low-temperature-resistant perfluoroether rubber and synthesis method thereof
  • Low-temperature-resistant perfluoroether rubber and synthesis method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) the ionic surfactant CF 3 -CF 2 -CF 2 -O-(CF 2 -CF 2 -O) 2 -CF 2 -COOH, nonionic surfactant (polyoxyethylene oleate), fluoroether oil (CF 3 -CF 2 -CF 2 -O-(CF 2 -CF 2 -O) 2 -CF 3 ), mixed with water according to the weight ratio (18:14:3:65), stirred gently and heated to 40°C and mixed evenly to form a colorless and transparent microemulsion with a weight of 500g. Comonomer A100g (CF 3 CF 2 CF 2 OCF (CF 3 ) CF 2 OF=CF) and comonomer B 2500g CF 3 OCF 2 OCF 2 OCF=CF 2 Add to the above microemulsion and mix well.

[0028] 2) Add 30L deionized water and 45g pH buffer disodium hydrogen phosphate to the reactor, replace the air in the reactor with nitrogen to make the oxygen content less than 20ppm, raise the reactor to 85°C, and use a diaphragm compressor to Mixed monomers (tetrafluoroethylene:perfluoromethyl vinyl ether=65:35mol%) were added into the reactor to raise the pressure to 4.0Mpa, and then the stirring was started to fully mix the mixed mon...

Embodiment 2

[0034] 1) the ionic surfactant CF 3 -CF 2 -CF 2 -O-(CF 2 -CF 2 -O) 2 -CF 2 -COOH, nonionic surfactant (polyoxyethylene oleate), fluoroether oil (CF 3 -CF 2 -CF 2 -O-(CF 2 -CF 2 -O) 2 -CF 3 ), water, etc. according to the weight ratio (18:14:3:65), gently stirred and heated to 40°C and mixed evenly to form a colorless and transparent microemulsion with a weight of 500g. Comonomer A240g (CF 3 CF 2 CF 2 OCF (CF 3 ) CF 2 OF=CF) and comonomer B 3500g CF 3 OCF 2 OCF 2 OCF=CF 2 Add to the above microemulsion and mix well.

[0035] 2) Add 30L deionized water and 45g pH buffer disodium hydrogen phosphate to the reactor, replace the air in the reactor with nitrogen to make the oxygen content less than 20ppm, raise the reactor to 85°C, and use a diaphragm compressor to Mixed monomers (tetrafluoroethylene:perfluoromethyl vinyl ether=65:35mol%) were added into the reactor to raise the pressure to 4.0Mpa, and at this time, the stirring was started to fully mix the mixe...

Embodiment 3

[0042] 1) the ionic surfactant CF 3 -CF 2 -CF 2 -O-(CF 2 -CF 2 -O) 2 -CF 2 -COOH, nonionic surfactant (polyoxyethylene oleate), fluoroether oil (CF 3 -CF 2 -CF 2 -O-(CF 2 -CF 2 -O) 2 -CF 3 ), water, etc. according to the weight ratio (15:10:5:70), gently stirred and heated to 40°C and mixed evenly to form a colorless and transparent microemulsion with a weight of 500g. Comonomer A240g (CF 3 CF 2 CF 2 OCF (CF 3 ) CF 2 OF=CF) and comonomer B3500gCF 3 OCF 2 OCF 2 OCF=CF 2 Add to the above microemulsion and mix well.

[0043] 2) Add 30L deionized water and 45g pH buffer disodium hydrogen phosphate into the reactor, replace the air in the reactor with nitrogen to make the oxygen content less than 20ppm, raise the reactor to 90°C, and use a diaphragm compressor to Mixed monomers (tetrafluoroethylene: perfluoromethyl vinyl ether = 70:30mol%) were added into the reactor to raise the pressure to 4.4Mpa, and then the stirring was started to fully mix the mixed mono...

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Abstract

The invention relates to a synthesis method of a low temperature-resistant perfluoroether rubber. The synthesis method comprises the following steps: 1) evenly mixing an emulsifier, fluoroether oil and water together and heating until 40 DEG C to form a microemulsion, and adding a comonomer A and a comonomer B to the microemulsion to obtain a mixed liquor; 2) adding deionized water and a pH regulator to a reaction kettle, adjusting the content of oxygen in the reaction kettle to be lower than 20ppm, increasing the temperature in the reaction kettle to the range of 70-120 DEG C, and adding the mixture of tetrafluoroethylene and perfluoromethyl vinyl ether to the reaction kettle; 3) adding the mixed liquor to the reaction kettle and adding the initiator potassium peroxodisulfate to start reacting, and adding a vulcanization point monomer and a chain transfer agent until the reaction ends, thereby obtaining a polymer; 4) performing electrolyte coagulation on the polymer and then washing, drying in vacuum and molding by plastifying to obtain the perfluoroether rubber. The synthesis method is simple to operate and mild in reaction conditions, and is capable of preparing the low-temperature-resistant perfluoroether rubber by adjusting the monomer structure.

Description

technical field [0001] The invention belongs to the field of polymer materials, and relates to a low-temperature-resistant perfluoroether rubber and a synthesis method thereof. Background technique [0002] The commonly used monomers used in the production of perfluororubbers in the past ten years are tetrafluoroethylene (TFE) and perfluoromethyl vinyl ether (PMVE), and their glass transition temperature (Tg) generally can only reach 0 °C. Later application of other types of perfluoromonomers lowered the glass transition temperature to -17°C. Studies by Tatemoto et al. have shown that the glass transition temperature of TFE and CF2=CF-o-(CF2-CF(CF3))n-o-C3F7 (wherein N=1~3) high molecular copolymer is about -30 ℃, but the copolymerization single The low reactivity of the body and the slow polymerization rate make this material unable to be produced commercially in large quantities. Contents of the invention [0003] Aiming at the defects of the prior art, the object of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F214/26C08F216/14C08F2/38C08F2/26C08F2/30
Inventor 兰军张建新李斌刘斌
Owner ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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