Intensified microporous membrane of polyethersulfone and method for preparing the same

Intensified microporous membrane of polyethersulfone and method for preparing the same

  • CN 1,843,600 B
  • Filed: 03/28/2006
  • Issued: 11/24/2010
  • Est. Priority Date: 03/28/2006
  • Status: Active Grant
First Claim
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1. the preparation method of an intensified microporous membrane of polyethersulfone, described enhancement mode polyether sulfone micropore is made of microporous membrane of polyethersulfone and the enhancement layer that is compounded in said microporous membrane of polyethersulfone one side, the molecular weight of said microporous membrane of polyethersulfone is 40000~

  • 70000, bore dia is 0.01~

    20 μ

    m, and thickness is 40~

    140 μ

    m;

    Said enhancement layer has network-like fibre structure, and the aperture is 10~

    50 μ

    m, and thickness is 50~

    90 μ

    m;

    It is characterized in that, comprise the steps;

    A. the preparation of casting solution;

    at first polyether sulfone is dissolved in the solvent, and the adding additive becomes casting solution through fully stirring;

    The mass concentration of polyether sulfone in casting solution is 15~

    17%;

    The mass concentration of described additive in casting solution is 5~

    6%;

    Said solvent is more than one in dimethyl formamide or the dimethylacetylamide;

    Described additive is more than one in polyethylene pyrrolinone or the polyethylene glycol;

    B. forming film with phase transformation method;

    with the casting solution hydrostomia to enhancement layer, to soak the enhancement layer scraper knifing of full casting solution, in air, leave standstill and immersed in the coagulation bath afterwards in 5~

    300 seconds, gap between scraper and enhancement layer is 20~

    30 microns, and take out back to be filmed, immerses in 20~

    35 ℃

    of water 1~

    10 minute again, putting into 50~

    100 ℃

    of water afterwards again heat-treated 5~

    600 minutes, take out, after the diaphragm drying, promptly obtain microporous barrier;

    The mass concentration of described additive in coagulation bath is 0~

    60%;

    Described coagulation bath is the water or the aqueous solution that contains additive, and described additive is one or more in dimethyl formamide, dimethylacetylamide, dimethyl sulfoxide (DMSO), N-methyl pyrrolidone, polyethylene glycol or the polyethylene pyrrolinone.

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