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Permanent hydrophilic polyvinylidene fluoride membrane and production method thereof

The invention relates to the technical field of water treatment and in particular discloses a permanent hydrophilic polyvinylidene fluoride membrane. The permanent hydrophilic polyvinylidene fluoridemembrane comprises a micro-pore supporting layer and a dense separation layer, wherein the micro-pore supporting layer is provided with sponge-shaped pores and the pore diameter is greater than or equal to 0.5mu m; the pore diameter of the dense separation layer is less than or equal to 0.1mu m and the water contact angle of the dense separation layer is less than or equal to 70 degrees; after thepermanent hydrophilic polyvinylidene fluoride membrane is immersed in high-temperature water for a long period, the variation of the water contact angle of the membrane is less than or equal to 10 percent. The invention further discloses a production method of the permanent hydrophilic polyvinylidene fluoride membrane; the production method comprises the following steps: preparing a homogeneous-phase solution; molding through a mold; separating and curing through the cooling medium; removing a dilute phase and drying. According to the permanent hydrophilic polyvinylidene fluoride membrane andthe production method thereof, the sponge-shaped and opened micro-pore supporting layer and the dense separation layer which is denser than the micro-pore supporting layer are arranged, so that the permanent hydrophilic polyvinylidene fluoride membrane has the advantages of low production cost, simple production procedures, dense separation layer, loose supporting layer, high compressive strength, high transmission flow and high stability of hydrophilic performance.
Owner:ZHEJIANG CHANGXING CREFLUX MEMBRANE TECH CO LTD
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