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A kind of preparation method of high molecular weight polyethylene microporous membrane

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

Inactive Publication Date: 2015-10-07
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

[0026] In a stainless steel reactor, under the protection of nitrogen, 10% by weight of high molecular weight polyethylene (ethylene and 1-butene copolymer with a molecular weight of 1.5 million, the weight percentage of 1-butene in the copolymer is 3.1 %) and 90% liquid paraffin at a temperature of 180°C for 12 hours, and a gel-like homogeneous system was obtained 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 12h. The dried microporous film is biaxially stretched in a constant temperature box equipped with an adjustable temperature range, first stretched 3 times along one direction, and then stretched 3 times along the other direction to obtain high molecular weight polyethylene Microporous membrane with an average pore size of 1.3 microns, a porosity of 55%, and a pure water flux ...

Embodiment 2

[0028] In a stainless steel reactor, under the protection of nitrogen, 10% by weight of high molecular weight polyethylene (ethylene and 1-butene copolymer, the weight percentage of 1-butene in the copolymer is 2.6 %) and 90% liquid paraffin at a temperature of 180°C for 12 hours, and a gel-like homogeneous system was obtained 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 12h. The dried microporous film is biaxially stretched in a temperature-adjustable thermostat, first stretched 3 times along one direction, and then stretched 3 times along the other direction to obtain a high molecular weight polyethylene microporous membrane. Porous membrane with an average pore size of 1.4 microns, a porosity of 62%, and a pure water flux of 677L / m 2 .h.

Embodiment 3

[0030] In a stainless steel reactor, 10% by weight of ultra-high molecular weight polyethylene (ethylene and 1-butene copolymer, the weight percentage of 1-butene in the copolymer is 6 million under nitrogen protection. 1.6%) and 90% liquid paraffin were dissolved at 180°C for 12 hours, and a gel-like homogeneous system was obtained 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 12h. The dried microporous membrane is biaxially stretched in a constant temperature box equipped with an adjustable temperature range, first stretched 3 times along one direction, and then stretched 3 times along the other direction to obtain an ultra-high molecular weight polymer. Ethylene microporous membrane with an average pore size of 0.98 microns, a porosity of 46%, and a pure water flux of 476L / m 2 ....

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Abstract

The invention provides a preparation method of a high-molecular-weight polyethylene microporous membrane. Polyethylene is an ultrahigh-molecular-weight copolymer of ethylene and alpha-olefin. The preparation method comprises the following steps: carrying out melt mixing, filming through extruding or mould pressing, solvent extraction, drying setting and two-way stretching on an ultrahigh-molecular-weight polyethylene copolymer to obtain the microporous membrane. The polyethylene microporous membrane, provided by the invention, is uniform in pore size distribution and high in porosity, and has better longitudinal and horizontal mechanical property. The microporous membrane can be used in fields such as water treatment, separation and purification.

Description

technical field [0001] The invention relates to a high molecular weight 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 c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D67/00B01D71/26C02F1/44B29C47/92B29C43/58B29K23/00B29C48/92
Inventor 王晓彬
Owner BEIJING DEYUANTONG ENVIRONMENTAL PROTECTION TECH
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