A green preparation method of hydrophilized polyvinylidene fluoride membrane material
A technology of vinylidene fluoride and aqueous solution, which is applied in the field of green preparation of hydrophilized polyvinylidene fluoride membrane materials, can solve the problems of limited chemical modification space and low polymerization activity, and achieves mild and controllable polymerization conditions and high product quality. Clean, low-energy results
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[0021] Below in conjunction with embodiment the present invention is described in further detail.
[0022] Vinylidene fluoride / dimethyl diallyl ammonium chloride copolymer is prepared according to the following steps:
[0023] a. Dissolve 1.5g of gemini-type surfactant initiator in 500mL of water, the concentration is generally in the range of 2.5-3.0‰, the amount of initiator is generally 2.5-3.0% of the weight of vinylidene fluoride, by adding different amounts of acetic acid and sodium phosphate The mixture is used to adjust the pH value of the aqueous solution (pH=9~10; pH=7~8; pH=4.0~4.5), the aqueous solution is placed in a closed high-pressure reactor, and nitrogen gas is passed into the reactor to remove the internal air;
[0024] b. Inject 55g of oil-soluble monomer vinylidene fluoride (boiling point at 0.1MPa is -84°C) into the reactor, maintain a pressure of 5.5MPa at room temperature, keep the monomer in a liquid state, and add potassium persulfate to saturate afte...
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