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Method of preparing peroxide vulcanized fluororubber through nano emulsion polymerization

A technology for vulcanizing fluororubber and nanoemulsion, which is applied in the field of nanoemulsion polymerization to prepare peroxide vulcanized fluororubber, can solve the problems of reduced equipment utilization rate, low solid content, affecting production efficiency, etc., so as to improve production efficiency and improve emulsion concentration. , the effect of excellent mechanical properties and processability

Active Publication Date: 2018-07-20
江苏梅兰化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] CN101274969B has described a kind of microemulsion polymerization method of fluorine-containing polymer, and it adopts perfluorooctanoic acid ammonium or perfluorononanoic acid ammonium as emulsifier, and non-fluorine alkanol is co-emulsifier, and the microemulsion solid content of gained is lower than 10%, Therefore, the utilization rate of the equipment is greatly reduced, which affects the production efficiency.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: in the container of 10L, add the deionized water of 4kg, 3.8kg structural formula is CF3O(CF(CF3)CF2O)COONHThe fluoroether carboxylate, 1.6kg structural formula is CF3O(CF(CF3)CF2O)10( CF2CF2O)4CF3 The fluoroether oil is stirred evenly under normal temperature and pressure, and the aqueous solution of the microemulsion surfactant with a concentration of 57.4% is obtained.

Embodiment 2

[0023] Example 2: Taking a 10L polymerization kettle as an example, add 6kg of ion-free water, 0.3kg of the microemulsion surfactant prepared in Example 1 and the vulcanization point monomer 4-bromo-3,3,4,4 into the reaction kettle -Tetrafluoro-1-butene 12g, 1,6-diiododecafluorohexane 7g; After nitrogen replacement and vacuum treatment, after the oxygen content in the kettle is ≤20ppm; the mass ratio of adding to the kettle is 25:38 : 37 mixed monomers of tetrafluoroethylene, vinylidene fluoride, and hexafluoropropylene, until the pressure of the kettle is 1.8 Mpa; stir, heat up to 80°C, add 140g of ammonium persulfate initiator with a concentration of 5% to start the reaction, during the reaction Continuously add the monomer mixture to keep the pressure at 1.8Mpa; stop the reaction after a certain amount of reaction, and recover the unreacted mixed monomer after cooling; the latex obtained by polymerization is coagulated, washed, dried and dehydrated, and then obtained by the ...

Embodiment 3

[0024] Example 3: Taking a 20L polymerization kettle as an example, add 12kg of deionized water, 0.6kg of the microemulsion surfactant prepared in Example 1 and the vulcanization point monomer 4-bromo-3,3,4,4 in the reaction kettle -Tetrafluoro-1-butene 24g, 1,6-diiododecafluorohexane 14g; After nitrogen replacement and vacuum treatment, after the oxygen content in the kettle is ≤20ppm; the mass ratio of adding to the kettle is 25:38 : 37 mixed monomers of tetrafluoroethylene, vinylidene fluoride, and hexafluoropropylene, until the pressure of the kettle is 2.0Mpa; stir, heat up to 82°C, add 300g of ammonium persulfate initiator with a concentration of 5% to start the reaction, during the reaction Continuously add the monomer mixture to keep the pressure at 2.0Mpa; stop the reaction after a certain amount of reaction, and recover the unreacted mixed monomer after cooling; the latex obtained by polymerization is coagulated, washed, dried and dehydrated, and then obtained by the ...

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PUM

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Abstract

The invention discloses a method of preparing peroxide vulcanized fluororubber through nano emulsion polymerization. The method comprises following steps: step one, compounding a fluorine ether emulsifier and a co-emulsifier according to a mass ratio of (60:40)-(80:20) to obtain a water solution with a nano emulsion polymeric surfactant concentration of 35-65%; step two, under the action of nano emulsion polymeric surfactant and an initiator, carrying out nano emulsion polymerization of one or more fluorine containing monomers or one or more vulcanized point monomers in a polymerization kettle; and step three, subjecting the latex obtained in polymerization to agglomeration, washing, drying, and dehydration, and preparing peroxide vulcanized fluororubber sheets by an open mill.

Description

technical field [0001] The invention relates to a method for preparing peroxide vulcanized fluororubber by nanoemulsion polymerization. Background technique [0002] Peroxide vulcanized fluororubber has advantages in chemical resistance, steam resistance, compression deformation resistance and other properties compared with other vulcanized system fluororubbers, and has good application in the sealing industry, especially for high temperature and high pressure, and The environment in contact with steam or acid, such as usually used in engine fuel system, chemical anticorrosion, etc. In addition, it has outstanding fluidity; extremely convenient mold release; low Mooney viscosity in high filling formula; excellent heat tear resistance; fast vulcanization, no / short secondary vulcanization time and other superior properties , More and more automatic molding production lines choose to use peroxide vulcanized fluororubber, especially in high-end application markets such as Europ...

Claims

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Application Information

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IPC IPC(8): C08F214/22C08F214/26C08F214/28C08F214/18C08F2/24
CPCC08F2/24C08F214/22C08F214/26C08F214/28C08F214/182
Inventor 钱厚琴王昌尧代生华吴玉勋
Owner 江苏梅兰化工有限公司
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