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
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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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