Method for preparing polyimide hollow fiber pervaporation membrane and application thereof

Method for preparing polyimide hollow fiber pervaporation membrane and application thereof

  • CN 101,992,033 A
  • Filed: 08/28/2009
  • Published: 03/30/2011
  • Est. Priority Date: 08/28/2009
  • Status: Active Application
First Claim
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1. the preparation method of polyimides doughnut infiltrating and vaporizing membrane is characterized in that preparation process comprises the steps:

  • (1) according to following parts by weight casting film solution;

    polyimide acid 10-24, polyvinylpyrrolidone 0.1-4, nonsolvent additive 10-25, polar organic solvent 79.9-47;

    (2) above-mentioned casting film solution is injected the doughnut spinning-drawing machine, extrude from spinning head under the air pressure effect through press filtration, extruded velocity is 1-80m/min;

    (3) the nascent hollow-fibre membrane that will extrude after 5-150cm distance, soaked 0.2-4 hour in temperature is 0-85 ℃

    water-bath in air, and wherein filling liquid is a water, and the flow velocity of water is 1-100ml/min;

    (4) with 200-400 ℃

    of heating 1-6 hour in baking oven of polyimide acid hollow-fibre membrane.

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