Method for effectively preparing polyimide fiber

Method for effectively preparing polyimide fiber

  • CN 102,220,652 B
  • Filed: 04/14/2010
  • Issued: 05/20/2015
  • Est. Priority Date: 04/14/2010
  • Status: Active Grant
First Claim
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1. prepare a method for polyimide fiber, it is characterized in that by (1), (2), (3) and (4), or (1) ~ (4) step:

  • (1) preparation of presoma polyamic acid solution that uses of spinning;

    by mol ratio be 1;

    0.95 ~ 1.05 dianhydride and diamine monomer in 0-30 DEG C and polar organic solvent, polymerization 5 ~ 10 hours obtained presoma polyamic acid solutions are as spinning slurry, the concentration of polyamic acid solution is 15-30wt%;

    (2) cyclizing agent is joined in polyamic acid solution prepared by step (1), and stir at the temperature of 0-30 DEG C;

    Described cyclizing agent is acetic anhydride, pyridine or triethylamine, and the addition of cyclizing agent is 0.3-0.9 relative to the mol ratio of diamines, generating portion cyclization;

    (3) dry spinning of fiber in high temperature path is shaped;

    polyamic acid solution deaeration in a vacuum prepared by step (2), polyamic acid solution enters spinning shaft by filament spinning component, polyamic acid solution forms solid fabric by the volatilization of solvent in high temperature path, under the acting in conjunction of cyclizing agent, cyclization completes in spinning technique process, winding shaping under path;

    The temperature of spinning shaft is 200 ~ 320 DEG C, length 8 ~ 12 meters;

    (4) hot-stretch of polyimide fiber;

    temperature is at 370 ~ 550 DEG C, and draw ratio is 2 ~ 8 times;

    Wherein, described dianhydride has following structural formula;

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