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Perfluoroether elastomer and preparation method thereof

A technology of elastomer and perfluoroether, which is applied in the field of preparation of fluoroelastomer to achieve the effect of increasing flexibility and enhancing crosslinking density

Active Publication Date: 2017-01-11
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

However, domestic enterprises have not yet occupied their due position in the field of perfluoroelastomers (2001, Liu Lingmei, "Overview of the Properties and Applications of Fluorine Rubber")

Method used

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  • Perfluoroether elastomer and preparation method thereof
  • Perfluoroether elastomer and preparation method thereof
  • Perfluoroether elastomer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] In a 5L stainless steel reactor equipped with a stirrer, add 3L of deionized water, 2g of dipotassium hydrogen phosphate, 2g of emulsifier (a mixture of perfluoropolyether peroxide and sodium octyl sulfonate with a mass ratio of 1:1), After repeating nitrogen pressurization and evacuating and degassing, the mixed monomer of TFE / PMVE / PPVE=60 / 35 / 5 (molar ratio) was added to the reactor with a compressor, and the pressure was increased to 1.2 MPa at 80°C. 10g of perfluorobromoethyl vinyl ether and 10g of 15% (wt) ammonium persulfate aqueous solution were pumped into the pump to initiate the polymerization reaction. When the reactor pressure drops to 1.0MPa, add ICHF 2 CHF 2 I 5g, while adding VDF / HFP=80 / 20TFE / PMVE / PPVE=60 / 35 / 5 (molar ratio) of mixed monomers, keeping the pressure in the reactor at 1.2MPa.

[0032] As the reaction progresses, 10 g of the initiator aqueous solution, that is, 15% (wt) ammonium persulfate aqueous solution, is added once every 4 hours. The reacti...

Embodiment 2

[0039] In a 5L stainless steel reactor with a stirrer, add 3L of non-ionized water, 2g of dipotassium hydrogen phosphate, 2g of emulsifier (perfluoropolyether peroxide and sodium octyl sulfonate with a mass ratio of 1:1), repeat After pressurizing with nitrogen and evacuating and degassing, the mixed monomer of TFE / PMVE / PEVE=60 / 35 / 5 (molar ratio) is added to the reactor with a compressor, and the pressure is increased to 1.2 MPa at 80°C and passed through a metering pump 10g of perfluorobromoethyl vinyl ether and 10g of 15% (wt) ammonium persulfate aqueous solution were pressed into it to initiate the polymerization reaction. When the pressure of the reactor drops to 1.0MPa, add I(CF 2 CF 2 ) 2 I 8g, while adding TFE / PMVE / PEVE=60 / 35 / 5 (molar ratio) of mixed monomers, keeping the pressure in the reactor at 1.2 MPa.

[0040] As the reaction progresses, 10 g of 15% (wt) ammonium persulfate aqueous solution of initiator is added once every 4 h. The reaction lasted for about 10 hours...

Embodiment 3

[0044] In a 5L stainless steel reactor with a stirrer, add 3L of non-ionized water, 2g of dipotassium hydrogen phosphate, and 2g of emulsifier. After repeated nitrogen pressurization and evacuation and degassing, add TFE / PMVE / to the reactor with a compressor. PEVE / PPVE=65 / 30 / 2 / 3 (molar ratio) of mixed monomers, the pressure is increased to 1.2MPa at 80°C, and 10g of perfluorobromoethyl vinyl ether, 10g of 15% ( wt) Aqueous ammonium persulfate solution initiates the polymerization reaction, and when the pressure of the reactor drops to 1.0MPa, add I(CF 2 ) 5 I 4g was added at the same time with TFE / PMVE / PEVE / PPVE=65 / 30 / 2 / 3 (molar ratio) of mixed monomers, keeping the pressure in the reactor at 1.2MPa.

[0045] As the reaction progresses, 10 g of 15% (wt) ammonium persulfate aqueous solution of initiator is added once every 4 h. The reaction lasted for about 8 hours, and about 4.5 kg of elastomer emulsion was obtained. Agglomerate with sodium chloride aqueous solution, wash, and ...

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Abstract

The invention discloses a preparation method of a perfluoroether elastomer. The preparation method comprises the step of carrying out emulsion polymerization on four comonomers in the presence of an initiator and a chain transfer agent, so as to prepare a fluorine-containing elastomer, wherein the four comonomers are as follows: the first monomer is tetrafluoroethylene, the second monomer is perfluoromethyl vinyl ether, the third monomer is a vulcanization point monomer, and the fourth monomer is pentafluoroethyl vinyl ether and / or pentafluoropropyl vinyl ether; and the fluorine-containing elastomer is prepared from the following steps: adding water into a reaction container, introducing a mixture of the first monomer, the second monomer and the fourth monomer, maintaining the pressure of the container at 0.5MPa-2.0MPa, adding 2g / L-10g / L of the third monomer according to the mass volume ratio, and carrying out polymerization reaction. According to the preparation method, the monomers such as PEVE / PPVE are used in the reaction, so that the rigidity of molecular chains can be reduced, the flexibility of molecular chains can be increased, and the hardness of the perfluoroether elastomer is reduced.

Description

Technical field [0001] The invention relates to the field of fluoroelastomers, in particular to a method for preparing fluoroelastomers that can be vulcanized with peroxides. Background technique [0002] Fluorine rubber has been widely used in various fields, but with the continuous advancement of science and technology, human demand for special fluoroelastomers is increasing. Such as low temperature resistant fluororubber, solvent resistant fluororubber, 300℃ high temperature resistant fluororubber. Perfluororubber is mainly composed of tetrafluoroethylene and perfluoroalkyl vinyl ether as the main monomers, and cyano group-containing perfluoroolefins and (perfluoro)phenoxy olefins are used as vulcanization point monomers for copolymerization, as shown by the name That way, all the hydrogen atoms on the carbon atoms in the polymer are replaced by fluorine atoms, and it has a structure that is extremely stable to high temperatures and chemicals. For example, it has the high tem...

Claims

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Application Information

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IPC IPC(8): C08F214/26C08F216/14C08F2/38C08F2/26C08F2/30C08L27/18
Inventor 曾波汪仲权张建新李斌王先荣余金龙张廷健龚蓉
Owner ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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