Preparation method of high-speed extrusion grade polyperfluoroethylene propylene

A polyperfluoroethylene propylene and high-speed extrusion technology, which is applied in the field of polyperfluoroethylene propylene resin modification, can solve the problems of increased polymer volatile content, fluctuation of pH value, influence of reaction rate and temperature of post-processing pellets, etc. , to achieve the effect of reducing volatile matter, constant decomposition rate, and reducing the number of melt fractures

Active Publication Date: 2018-03-20
SHANDONG HUAXIA SHENZHOU NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In the existing patent of the third monomer modified polyperfluoroethylene propylene, there is a problem that the pH value of the reaction emulsion fluctuates from neutral or basic to strong acidity, and the competitive polymerization of tetrafluoroethylene and hexafluoropropylene monomers The rate fluctuates before and after the reaction, leading to an increase in the volatile content of the polymer. In addition, there is a small amount of Fe produced by corrosion in the metal reaction vessel. 3+ , Mg 2+ Metal ions, etc., will affect the reaction rate temperature and the color of post-treatment pellets

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] In a stainless steel 100L polymerization kettle, add 70L of deionized water, add 400g perfluoropolyether (mass concentration 40%), and 200ml of 0.1mol / L (with phosphate root concentration) disodium hydrogen phosphate between 6-8 Buffer solution, 100ml of 0.01mol / L disodium EDTA solution, the oxygen content of the polymerizer is qualified, then vacuumize the polymerizer, inhale 3kg of perfluorocyclohexane, 1kg of perfluoropropyl vinyl ether, and start the polymerization Stir the kettle, then add the initial monomer mixture, the molar ratio of tetrafluoroethylene to hexafluoropropylene in the added initial monomer mixture is 1:4, heat up to 100°C, keep the reaction pressure at 2.5MPa, add 200mL of 2.5% super ammonium sulfate initiator, and then continue to inject additional monomers into the polymerization kettle, the molar ratio of tetrafluoroethylene and hexafluoropropylene in the additional monomers is 10:1, while adding additional monomers, continue to add 2100mL2 Add...

Embodiment 2

[0036] In a stainless steel 100L polymerization kettle, add 70L of deionized water, add 400g of perfluoropolyether (mass concentration 40%), 200ml of 0.1mol / L (with phosphate radical concentration) maleic anhydride acrylic acid between 6-8 Salt copolymer, 100ml of 0.01mol / L disodium EDTA solution, the oxygen content of the polymerizer is qualified, and then vacuumized in the polymerizer, inhaled 3kg of perfluorocyclohexane, 1kg of perfluoropropyl vinyl ether, and opened Stir the polymerization tank, then add the initial monomer mixture, the molar ratio of tetrafluoroethylene to hexafluoropropylene in the added initial monomer mixture is 1:3, heat up to 110°C, keep the reaction pressure at 4MPa, add 200mL of 2.5% super ammonium sulfate initiator, and then continuously inject additional monomers into the polymerization kettle, the molar ratio of tetrafluoroethylene and hexafluoropropylene in the additional monomers is 5:1, while adding additional monomers, continue to add Add in...

Embodiment 3

[0038]In a stainless steel 100L polymerization kettle, add 70L of deionized water, add 400g perfluoropolyether (mass concentration 40%), and 200ml of 0.1mol / L (with phosphate root concentration) disodium hydrogen phosphate between 6-8 Buffer solution, 100ml of 0.01mol / L disodium EDTA solution, the oxygen content of the polymerizer is qualified, then vacuumize the polymerizer, inhale 3kg of perfluorocyclohexane, 1kg of perfluoroethyl vinyl ether, and start the polymerization Stir the kettle, then add the initial monomer mixture, the molar ratio of tetrafluoroethylene to hexafluoropropylene in the added initial monomer mixture is 1:6, heat up to 70°C, keep the reaction pressure at 3MPa, add 200mL of 2.5% persulfuric acid Ammonium initiator, and then continue to add additional monomers to the polymerization kettle, the molar ratio of tetrafluoroethylene and hexafluoropropylene in the additional monomers is 25:1, while adding additional monomers, continue to add 2100mL 2.5 % ammon...

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PUM

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Abstract

The invention relates to a preparation method of high-speed extrusion-grade polyperfluorinated ethylene-propylene, belonging to the technical field of polyperfluorinated ethylene-propylene resin modification. The preparation method of the high-speed extrusion-grade polyperfluorinated ethylene-propylene comprises the following steps: by using tetrafluoroethylene, hexafluoropropylene and perfluoroalkyl vinyl ether as comonomers, adding a pH buffering agent, a chelator and an emulsifier into pure water, adding a fluorocarbon solvent and an initial monomer mixture, initiating polymerization reaction at certain temperature under certain pressure, and supplementing the monomer mixture in the reaction process, thereby finally obtaining the modified polyperfluorinated ethylene-propylene. The method has the advantages of simple technique, stable reaction rate and stable emulsion pH value, and lowers the volatile compounds of the polymer powder; and the prepared polyperfluorinated ethylene-propylene granules do not have the phenomenon of staining, and can be smoothly extruded and spread on the wire surface at the speed of 400-500m / minute.

Description

technical field [0001] The invention relates to a preparation method of high-speed extrusion-grade polyperfluoroethylene propylene, which belongs to the technical field of polyperfluoroethylene propylene resin modification. Background technique [0002] FEP (polyfluoroethylene propylene resin) has excellent heat resistance, chemical resistance and extrusion formability, etc. In addition, it also has excellent electrical insulation and low dielectric loss tangent at high frequencies. Therefore, FEP is widely used to insulate cables. [0003] U.S. Patent US2952669 was first developed by DuPont in 1946 as a polyperfluoroethylene-propylene copolymer that can be processed into a film. Afterwards, the continuous improvement of the polymerization process, in order to increase the critical shear rate of polyfluoroethylene-propylene, domestic and foreign enterprises Most adopt the method of the third monomer modification. [0004] In patent US 4564561, DuPont used iodine tape or br...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F214/28C08F214/26C08F216/14C08F2/26
CPCC08F2/26C08F214/262C08F214/282C08F216/1408
Inventor 王汉利骆涛王军武海朋徐清刚
Owner SHANDONG HUAXIA SHENZHOU NEW MATERIAL
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