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Polyolefine multiple micoporous film and preparing process thereof

A polyolefin and microporous technology, applied in polyolefin microporous membrane and its preparation, in the field of microporous polyolefin membrane, can solve the problems of complex production process, uniformity difference and high cost, achieve excellent performance, reduce The effect of high film thickness and elastic strength

Inactive Publication Date: 2004-06-16
李春香 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The technical problem to be solved in the present invention is to disclose a polyolefin microporous membrane to overcome the complex production process, low yield, high cost, thick film, poor uniformity and low strength existing in the prior art. defect;

Method used

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  • Polyolefine multiple micoporous film and preparing process thereof

Examples

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Embodiment 1

[0041]Linear polyethylene (Mw=230,000, Mw / Mn=2-8) was made into a raw film through a laboratory screw extruder at a temperature of 190°C and a stretch ratio of 16. The original film was annealed for 5 hours at a temperature of 120°C. Then, the original film with a width of 50 mm is cold-stretched longitudinally by 400%, at a stretching speed of 400% / min, at room temperature. The characteristics of the obtained film are as follows: porosity 60%, pore size 80-200nm, thickness 13μm, air permeability 15sec / 100cc, TD direction strength 2100kg / cm 2 , MD direction strength is 250kg / cm 2 , 100 ° C, 60 minutes free shrinkage rate of 35%. Its electron microscope pictures are as figure 1 .

Embodiment 2

[0043] Linear polyethylene (Mw=230,000, Mw / Mn=2-8) was made into a raw film through a laboratory screw extruder at a temperature of 190°C and a stretch ratio of 16. The original film was annealed for 5 hours at a temperature of 120°C. Then, the original film with a width of 50mm is cold-stretched longitudinally by 400%, at a stretching speed of 250% / min, at room temperature. The obtained microporous film was heat-set for 5 hours at a temperature of 105°C. The characteristics of the obtained film are as follows: porosity 50%, pore size 50-200nm, thickness 15μm, air permeability 23sec / 100cc, TD direction strength 1900kg / cm 2 , MD direction strength is 210kg / cm 2 , 100 ° C, 60 minutes free shrinkage rate of 38%.

Embodiment 3

[0045] Linear polyethylene (Mw=230,000, Mw / Mn=2-8) was made into a raw film through a laboratory screw extruder at a temperature of 200°C and a stretch ratio of 23. The original film was annealed for 5 hours at a temperature of 120°C. Then, the original film with a width of 50 mm is cold-stretched longitudinally by 200%, at a stretching speed of 800% / min, at room temperature. The obtained microporous film was heat-set for 5 hours at a temperature of 105°C. The characteristics of the obtained film are as follows: porosity 40%, pore size 20-200nm, thickness 10μm, air permeability 28sec / 100cc, TD direction strength 1700kg / cm 2 , MD direction strength is 180kg / cm 2 , 100 ° C, 60 minutes free shrinkage rate of 41%.

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Abstract

The invention discloses a polyolefine microporous membrane and method for preparation, wherein the polyolefine microporous membrane is a microporous film with micropore diameter 20-500nm, overall porosity 30%-60%, and film thickness 0.5-25mum. The process for preparing the polyolefine microporous membrane according to the invention comprises the steps of, (1) polyolefine film preparation, (2) film annealing, (3) single time stretching for pore-forming, (4) film shaping. The present invention realizes films with thinness and high tensile strength.

Description

technical field [0001] The invention relates to a microporous film made of polyolefin, in particular to a polyolefin microporous film and a preparation method thereof, specifically to a microporous polyolefin film prepared by a stretching method. Background technique [0002] Microporous polyolefin film is a functional polymer material that can be used as a diaphragm for chemical power sources, a diaphragm for capacitors, a base film for various coatings, microfiltration membranes, separation membranes, medical clothing and bandages, etc. Microporous polyolefin films can be produced by dissolution, thermally induced phase separation, and stretching. The dissolution method is a method of producing a microporous film by dissolution of inorganic particles filled in a polyolefin film. The main disadvantages of the microporous film produced by this method are: large pore size and uneven distribution. Currently, it is mainly used for urine. Wet, sanitary napkins and other product...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L23/02C08L27/18
Inventor 李春香张全生
Owner 李春香
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