Synthetic method of perfluoroether rubber with wide temperature range and the perfluoroether rubber

A technology of perfluoroether rubber and synthesis method, which is applied in the field of polymer material synthesis, can solve problems such as inability to meet low temperature resistance requirements, and achieve the effects of widening the temperature range, reducing the glass transition temperature, and improving the high temperature resistance performance.

Inactive Publication Date: 2020-01-21
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

The reported glass transition temperature Tg of perfluoroether rubber is about -2°C, which cannot meet the demand for low temperature resistance

Method used

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  • Synthetic method of perfluoroether rubber with wide temperature range and the perfluoroether rubber
  • Synthetic method of perfluoroether rubber with wide temperature range and the perfluoroether rubber
  • Synthetic method of perfluoroether rubber with wide temperature range and the perfluoroether rubber

Examples

Experimental program
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Effect test

Embodiment 1

[0036] This embodiment relates to a synthetic method of wide temperature range perfluoroether rubber, wherein the mass ratio of comonomer tetrafluoroethylene (TFE) and perfluoromethoxyethyl vinyl ether (a) is 10:90, including Follow the steps below:

[0037] In a 5L stainless steel reaction kettle with a stirrer, add 3L of deionized water, 2g of dipotassium hydrogen phosphate, and 2g of emulsifier perfluoropolyether carboxylate. Add 900g of perfluoromethoxyethyl vinyl ether (a) into the kettle, add part of TFE and then raise the temperature to 70°C, continue to add TFE monomer to increase the pressure to 1.0MPa, and press in 10g of perfluorobromoethyl through a metering pump Vinyl ether, 15% (wt) ammonium persulfate aqueous solution of 10g, 5g of I(CF 2 CF 2 ) 2 1 Polymerization starts, when reactor pressure drops every 0.01MPa, replenishes TFE monomer in reactor, maintains reactor inner pressure to be 1.0MPa.

[0038]The reaction was stopped when TFE continued to feed 100...

Embodiment 2

[0047] This embodiment relates to a synthetic method of wide temperature range perfluoroether rubber, wherein the mass ratio of comonomer tetrafluoroethylene (TFE) and perfluoromethoxyethyl vinyl ether (a) is 45:55, including Follow the steps below:

[0048] In a 5L stainless steel reaction kettle with a stirrer, add 3L of deionized water, 2g of dipotassium hydrogen phosphate, and 2g of emulsifier perfluoropolyether carboxylate. Add 550g of perfluoromethoxyethyl vinyl ether (a) into the kettle, add part of TFE and then raise the temperature to 70°C, continue to add TFE monomer to increase the pressure to 1.0MPa, and press in 10g of perfluorobromoethyl through a metering pump Vinyl ether, 15% (wt) ammonium persulfate aqueous solution of 10g, 5g of I(CF 2 CF 2 ) 2 1 Polymerization starts, when reactor pressure drops every 0.01MPa, replenishes TFE monomer in reactor, maintains reactor inner pressure to be 1.0MPa.

[0049] The reaction was stopped when TFE continued to feed 45...

Embodiment 3

[0054] This embodiment relates to a synthetic method of wide temperature range perfluoroether rubber, wherein the mass ratio of comonomer tetrafluoroethylene (TFE) and perfluoromethoxyethyl vinyl ether (a) is 45:55, including Follow the steps below:

[0055] In a 5L stainless steel reaction kettle with a stirrer, add 3L of deionized water, 2g of dipotassium hydrogen phosphate, and 2g of emulsifier perfluoropolyether carboxylate. Add 550g of perfluoromethoxyethyl vinyl ether into the kettle, add part of TFE and then raise the temperature to 70°C, continue to add TFE monomer to increase the pressure to 0.5MPa, and press in 4g of perfluorobromoethyl vinyl ether through a metering pump , 15% (wt) ammonium persulfate aqueous solution of 10g, the I(CF of 5g 2 CF 2 ) 2 1 Polymerization starts, when reactor pressure drops every 0.01MPa, replenishes TFE monomer in reactor, maintains reactor inner pressure to be 0.5MPa.

[0056] The reaction was stopped when TFE continued to feed 45...

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Abstract

The invention relates to a synthetic method of perfluoroether rubber with a wide temperature range. Main improvement points are as follows: tetrafluoroethylene and perfluoromethoxy ethyl vinyl ether are used as comonomers; the perfluoroether rubber is prepared through an emulsion polymerization method, and one or more of perfluoro-4-bromo-1-butene, perfluorobromoethyl vinyl ether, perfluoroiodoethyl vinyl ether, perfluoro-4-iodo-1-butene, trifluoroiodoethylene or trifluorobromoethylene is added as vulcanization point monomers in the polymerization reaction process; and I(CF2)nI is selected asa chain transfer agent. The perfluoromethoxy ethyl vinyl ether is selected as the monomer of the polymerization reaction, so that the temperature range of the perfluoropolyether obtained by polymerization can be effectively widened, the lowest temperature range can reach -35 DEG C, and the perfluoromethoxy ethyl vinyl ether can be used for a long time at the high temperature of 250 DEG C and has high and low temperature resistance.

Description

technical field [0001] The invention relates to the technical field of polymer synthesis, in particular to a method for synthesizing perfluoroether rubber. Background technique [0002] Fluoroelastomers are widely used in sealing materials, containers and hoses due to their excellent chemical resistance, oil resistance and high temperature resistance. Common common fluororubbers with vinylidene fluoride as the main comonomer are mainly divided into binary fluororubber (vinylidene fluoride-perfluoropropylene copolymer), ternary fluororubber (vinylidene fluoride-tetrafluoroethylene-perfluoroethylene) propylene) copolymer. Although these two types of fluororubbers are widely used in many harsh environments by humans. However, because it uses vinylidene fluoride as the main comonomer and contains "C-H" bonds in its molecular structure, it has certain limitations, such as poor alkali resistance and cannot be used for a long time at 300°C. [0003] In order to obtain fluorine r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F216/14C08F214/26
CPCC08F214/262C08F216/1408
Inventor 曾波陈立义王先荣陈炯
Owner ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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