A kind of preparation method of fluoroelastomer
A technology of elastomer and hexafluoropropylene, applied in the field of preparation of fluorine-containing elastomers, can solve the problems of poor mechanical properties, slow vulcanization speed, etc., and achieve the effects of good processability, increased fluorine content, and improved oil resistance
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Embodiment 1
[0039] (1) Add 6.5kg of deionized water, 65ml of 10wt% sodium perfluorooctanoate solution, and 10g of borax into the cleaned 10L polymerization kettle; evacuate and remove oxygen until the oxygen content is less than 30ppm.
[0040] (2) Then use 5 kg of monomers whose mole fractions are 60% vinylidene fluoride, 20% hexafluoropropylene and 20% tetrafluoroethylene, and prepare a mixture in the additional tank for later use;
[0041] (3) Put the mixture into the polymerization kettle with a compressor, and raise the temperature and pressure of the polymerization kettle. Ammonium sulfate initiator reacts, when reacting to 80% of monomer total amount, add 6.5ml molecular weight regulator isopentane. Adding concentration continuously in the reaction process is 1% organic initiator tert-butyl hydroperoxide 400g, until reaction finishes. After coagulation, washing, drying, kneading and forming, and testing.
[0042] The vulcanization speed of fluoroelastomer is tc90=215s, the resist...
Embodiment 2
[0044] Other conditions are the same as implementation 1, and the mole fraction composition is 5kg of monomers of 62% vinylidene fluoride, 20% hexafluoropropylene and 18% tetrafluoroethylene, and it is prepared as a mixture. At 115°C, use a metering pump to inject 65g of ammonium persulfate initiator with a concentration of 10wt% for reaction. When the reaction reaches 70% of the total amount of monomers, add 6.5ml of molecular weight telomer isopentane. Adding concentration continuously in the reaction process is 1% organic initiator tert-butyl hydroperoxide 400g, until reaction finishes. After coagulation, washing, drying, kneading and forming, and testing. The vulcanization speed of fluoroelastomer is tc90=197s, the resistance to methanol fuel, the change rate of tensile strength is 28%, and the change rate of elongation is 11%.
Embodiment 3
[0046] Other conditions are the same as implementation 1, the mole fraction composition is 5kg of monomers of 65% vinylidene fluoride, 18% hexafluoropropylene and 17% tetrafluoroethylene, and it is prepared as a mixture to increase the pressure of the polymerizer to 1.9MPa. When the kettle temperature rose to 115°C, a metering pump was used to inject 65g of ammonium persulfate initiator with a concentration of 10wt% for reaction. When the reaction reached 80% of the total amount of monomers, 6.5ml of molecular weight telomer isopentane was added. Adding concentration continuously in the reaction process is 1% organic initiator tert-butyl hydroperoxide 400g, until reaction finishes. After coagulation, washing, drying, kneading and forming, and testing. The vulcanization speed of fluoroelastomer is tc90=190s, the resistance to methanol fuel, the change rate of tensile strength is 34%, and the change rate of elongation is 15%.
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Abstract
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