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A method for preparing peroxide vulcanized fluororubber by nanoemulsion 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 low solid content, affecting production efficiency, and reducing equipment utilization rate, so as to improve emulsion concentration and improve production efficiency. , the effect of improving cold resistance

Active Publication Date: 2021-03-19
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] Example 1: 4 kg of non-ion water was added to a 10L container, 3.8 kg of structural formula was CF3O (CF (CF3) CF2O) 8CoonH4 fluororether carboxylate, 1.6 kg structural formula CF3O (CF (CF3) CF2O) 10 (CF3) CF2O) 10 CF2CF2O) 4CF3 fluororetal oil, stirred evenly at normal temperature, the aqueous solution of a microemulsion surfactant having a concentration of 57.4% is obtained.

Embodiment 2

[0023] Example 2: A 10L polymerization tank as an example, 6 kg of non-ionized water, 0.3 kg of Examples of 0.3 kg, and a vulcanization point monomer 4-bromo-3, 3, 4, 4, in the reaction kettle. - Tetrafluoro-1-butene 12g, 1,6-diiododexyl hexane 7g; nitrogen-replacement and vacuum treatment, after oxygen content of kettle is ≤ 20 ppm; to add mass ratio to the kettle 25:38 : 37 Tetrafluoroethylene, Fluoroethylene, hexafluoropropylene mixed monomer, until the kettle is 1.8 MPa; stirring, temperature rise to 80 ° C, the concentration of 5% ammonium sulfate initiator 140g begins to react, reaction Continuous addition of the monomer mixture to maintain the pressure at 1.8 MPa; when the reaction is stopped, the reaction is stopped, and the unreacted mixing monomer is recovered after cooling; the polymerized latex is condensed, washed, dried by the opening machine after drying. Oxide vulcanized fluoride rubber.

Embodiment 3

[0024] Example 3: Taking 20L polymerization tub as an example, 12 kg of no ionized water, 0.6 kg of Examples of 0.6 kg of Examples, 4-bromo-3, 3, 4, 4, in the reaction kettle. - Tetrafluoro-1-butene 24g, 1,6-diiododexyl hexane 14g; nitrogen-replacement and vacuum treatment, kettle internal oxygen content is ≤ 20 ppm; to the kettle to add mass ratio 25:38 : 37 Tetrafluoroethylene, Fluoroethylene, hexafluoropropene mixed monomer, until the kettle is 2.0 MPa; stirring, temperature rise to 82 ° C, add concentration of 5% ammonium sulfate initiator 300g to start reactions, reaction Continuous addition of the monomer mixture to maintain the pressure at 2.0 MPa; when the reaction is stopped, the reaction is stopped, and the unreacted mixing monomer is recovered; the polymerization of the obtained latex is condensed, washed, dried and dehydrated by the opening machine. Oxide vulcanized fluoride rubber.

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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 present invention relates to a method of preparing an oxide vulcanous fluorine rubber in a nanodexer polymerization. Background technique [0002] Peroxide vulcanized fluororne rubber has advantages in terms of chemical resistance, steam resistance, resistance deformation, and other properties of chemical resistance, steam, anti-compression deformation, etc., in particular for high temperature and high pressure, and Environments that are exposed to steam or acid, such as usually used in engine fuel systems, chemical anti-corrosion, and the like. In addition, it has highlighted fluidity; unusual and convenient release resistance; high-filled formulation maintains a lower dooris viscosity; excellent heat-resistant tear properties; fast vulcanization, no need / short time of secondary vulcanization time and other superior performance More and more automatic forming production lines choose to use peroxide sulfur-rubber, especially high-end applications such...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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