PVDF dispersion polymerization method
A technology of O-CFX and CF-O-CF, applied in the field of polyvinylidene fluoride polymerization, can solve the problems of reducing post-processing pressure, low free amount, environmental pollution, etc.
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[0040] 2. Preparation method of PVDF resin
[0041] The manufacture method of PVDF of the present invention, comprises adding reaction medium, above-mentioned polymerizable fluorine-containing surfactant of the present invention, vinylidene fluoride monomer and initiator to carry out radical dispersion polymerization in polymerization reaction container, makes PVDF resin.
[0042] In one example of the present invention, water is used as the reaction medium.
[0043] The fluorine-containing surfactant of the present invention can be used for the polymerization of vinylidene fluoride. Based on the total weight of vinylidene fluoride monomers, the amount of the fluorine-containing surfactant is 0.1-10%, preferably 0.15-8%, more preferably 0.2-6%, preferably 0.25-4%, preferably 0.3-2%.
[0044] In an example of the present invention, the manufacture method of PVDF of the present invention comprises the steps: add a certain amount of VDF monomer and the present invention polymer...
Embodiment 1
[0073] Add 33kg of deionized water in the 50L horizontal polymerization reactor of the screw ribbon blade, and 50g of polymerizable fluorosurfactant CF 2 =CF-O-CF(CF 3 )-O-CF 2 -CF 2 -SO 3 H, 30g di-tert-butyl peroxide, 20g DEM, 150g paraffin, the reaction temperature was raised to 130°C, the reaction pressure was raised to 4MPa, and the polymerization was carried out. After 4 hours of reaction, 7kg VDF was reacted, and the polymerization was terminated. The PVDF emulsion obtained by dispersion polymerization was coagulated, washed, and dried to obtain PVDF resin, and its performance was analyzed. The test results are shown in Table 1.
Embodiment 2
[0075] Add 33kg of deionized water to a 50L horizontal polymerization reactor with spiral blades, and 100g of polymerizable fluorosurfactant CF 2 =CF-O-CF(CF 3 )-O-CF 2 -CF 2 -SO 3 H, 35g di-tert-butyl peroxide, 20g DEM, 120g paraffin, the reaction temperature was raised to 120°C, and the reaction pressure was raised to 4MPa to carry out the polymerization reaction. After 4 hours of reaction, 7kg VDF was reacted in total, and the polymerization reaction was terminated. The PVDF emulsion obtained by dispersion polymerization was coagulated, washed, and dried to obtain PVDF resin, and its performance was analyzed. The test results are shown in Table 1.
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