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A kind of preparation method of polyethylene microporous membrane

A polyethylene microporous membrane and polyethylene technology, applied in the field of membrane materials, can solve the problems of increasing difficulty in the microstructure of microporous membranes, and achieve the effects of high porosity, stable performance, and uniform pore size distribution

Inactive Publication Date: 2016-04-06
BEIJING DEYUANTONG ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the molecular weight is very high, it is more difficult to control the microstructure of the microporous membrane by using the TIPS method alone.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Put 10% (by weight) of ultra-high molecular weight copolymerized polyethylene (copolymer of ethylene and 1-butene, the weight percentage of 1-butene in the copolymer is 0.1%) with a molecular weight of 1.8 million and 90% of liquid paraffin Put it into a three-necked flask, dissolve it at 170°C for 12 hours under the protection of nitrogen, and obtain a gel-like homogeneous system after cooling. Cut the gel-like homogeneous system into small pieces and put them between stainless steel plates, press them into a film on a tablet press at 180°C, after cooling, extract the diluent with ethanol; dry in a vacuum oven at 60°C After 12 hours, the ultra-high molecular weight polyethylene microporous membrane was finally obtained, with an average pore size of 1.12 microns, a variation range of 1.12±0.34 microns, a porosity of 47%, and a pure water flux of 180 L / m 2 .h.

Embodiment 2

[0024] Put 10% (by weight) of ultra-high molecular weight copolymerized polyethylene (copolymer of ethylene and 1-butene, the weight percentage of 1-butene in the copolymer is 10%) with a molecular weight of 3.5 million and 90% of liquid paraffin Put it into a three-necked flask, dissolve it at 170°C for 12 hours under the protection of nitrogen, and obtain a gel-like homogeneous system after cooling. Cut the gel-like homogeneous system into small pieces and put them between stainless steel plates, press them into a film on a tablet press at 180°C, after cooling, extract the diluent with ethanol; dry in a vacuum oven at 60°C After 12 hours, the ultra-high molecular weight polyethylene microporous membrane was finally obtained, with an average pore size of 0.95 microns, a variation range of 0.95±0.24 microns, a porosity of 55%, and a pure water flux of 154 L / m 2 .h.

Embodiment 3

[0026] Put 10% (weight percentage) of ultra-high molecular weight copolymerized polyethylene (copolymer of ethylene and 1-butene, the weight percentage of 1-butene in the copolymer is 1.2%) with a molecular weight of 8.8 million and 90% of liquid paraffin Put it into a three-necked flask, dissolve it at 170°C for 12 hours under the protection of nitrogen, and obtain a gel-like homogeneous system after cooling. Cut the gel-like homogeneous system into small pieces and put them between stainless steel plates, press them into a film on a tablet press at 180°C, after cooling, extract the diluent with ethanol; dry in a vacuum oven at 60°C After 12 hours, the ultra-high molecular weight polyethylene microporous membrane was finally obtained, with an average pore size of 0.58 microns, a variation range of 0.58±0.15 microns, a porosity of 48%, and a pure water flux of 168 L / m 2 .h.

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PUM

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Abstract

The invention provides a method for preparing a polyethylene microporous film. The method comprises the following steps of: melting and mixing all the components of a composition which comprises ultra-high molecular weight polyethylene and a diluent at a certain temperature; forming a film through compression molding; removing the diluent, washing and drying; and forming so as to obtain the polyethylene microporous film. The polyethylene microporous film provided by the invention has uniform pore diameter distribution, high porosity and good lateral and longitudinal mechanical performances. The microporous film provided by the invention can be used in the fields of water treatment, separation, purification and the like.

Description

technical field [0001] The invention relates to a polyethylene microporous membrane for water treatment, which belongs to the field of membrane materials. Background technique [0002] Membrane is a material with selective separation function. The selective separation of membrane is used to realize the separation, purification, concentration and other processes of different components of feed liquid. The difference between membrane separation and traditional filtration is that the membrane can separate in the molecular range, and it is a physical process that does not require phase changes and additives. Polymer membrane separation technology has been widely used in industrial, agricultural, domestic sewage treatment, water resource regeneration and other fields due to its advantages of high efficiency and low energy consumption. The core component of membrane separation technology is the microporous separation membrane in the module. It is the core content of membrane sep...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/26B01D67/00
Inventor 王晓彬
Owner BEIJING DEYUANTONG ENVIRONMENTAL PROTECTION TECH
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