Two-way synchronous stretching method for inducing and producing safety diaphragm with microporous structure

Two-way synchronous stretching method for inducing and producing safety diaphragm with microporous structure

CN
  • CN 102,683,630 B
  • Filed: 04/27/2012
  • Issued: 05/20/2015
  • Est. Priority Date: 04/27/2012
  • Status: Active Grant
First Claim
Patent Images

1. the preparation method producing microcellular structure blowout disk is brought out in biaxial tension, it is characterized in that being realized by following step:

  • (1) nano aluminium oxide is carried out surface preparation in tetra isopropyl titanate, be specially and the tetra isopropyl titanate of 1 ~ 4% of described nano aluminium oxide quality is mixed with nano aluminium oxide, sulfuration 20min under 120 ~ 145 DEG C of conditions, then under 150 DEG C of conditions post-cure 3h;

    (2) pretreated nano aluminium oxide is evenly mixed in polymer, addition is 0.5% ~ 2.5% of polymer quality, add inducing agent, described inducing agent is amphiphilic compound, melting is carried out to raw material, adopt bi-directional synchronization to stretch and make basement membrane, the basement membrane made is through 70 ~ 155 DEG C, and 10min ~ 30h anneals;

    (3) by basement membrane 10 ~ 155 DEG C, draw speed is 0.1 ~ 30m/min, draw ratio is carry out stretching under the condition of 1 ~ 3 times to form microcellular structure, be specially;

    first at 10 ~ 100 DEG C, draw ratio is 1 ~ 3 times, cold stretch is carried out under the condition of electromagnetic wave radiation, shish-kebab structure is broken, till forming small crazing defect;

    Then at 100 ~ 155 DEG C, draw ratio is stretch further under the condition of 1 ~ 3 times to form microcellular structure;

    (4) microporous membrane redraws, and draw ratio is 0.5 ~ 1.5,70 ~ 165 DEG C of sizings, forms microporous polyolefin film product.

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