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Preparation method for ultrahigh molecular weight polyethylene microporous membrane

A polyethylene microporous membrane and ultra-high molecular weight technology, applied in the field of membrane separation, can solve problems such as difficulty in obtaining pore structure, uneven pore size distribution of microporous membranes, etc., to prevent agglomeration, speed up the crystallization process, and small pore size Effect

Inactive Publication Date: 2012-06-20
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the TIPS method induces phase separation of the polymer solution through rapid heat exchange, which makes the pore size distribution of the prepared microporous membrane uneven.
At the same time, for polymers with a fast crystallization rate, it is often difficult to obtain a nanoscale pore structure by controlling the process conditions.

Method used

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  • Preparation method for ultrahigh molecular weight polyethylene microporous membrane
  • Preparation method for ultrahigh molecular weight polyethylene microporous membrane
  • Preparation method for ultrahigh molecular weight polyethylene microporous membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Melt and mix the ultra-high molecular weight polyethylene of 10% weight fraction, the liquid paraffin of 89.5% weight fraction, the antioxidant dibutyltin maleate of 0.5% weight fraction by Haake torque rheometer, obtain ultra-high molecular weight Polyethylene blend. The melt mixing temperature is 160° C., the melt mixing time is 12 min, and the rotor speed is 80 rpm.

[0033](2) Then the ultra-high molecular weight polyethylene mixture is formed into a flat film on a laminator. The film thickness is controlled at 200um, the molding temperature is 160°C, and the molding time is 5min.

[0034] (3) Then use absolute ethanol to extract the liquid paraffin, wash it repeatedly with deionized water, and form a microporous membrane after drying.

[0035] (4) Finally, an oven is used to dry and anneal the microporous membrane to obtain an ultra-high molecular weight polyethylene microporous membrane. The drying temperature is 80°C, the drying time is 3 hours, the anneal...

Embodiment 2

[0037] (1) First use a flask to melt and mix 150 g of liquid paraffin and 1% by weight of DBS in an oil bath at 240° C., while stirring magnetically until a homogeneous solution is formed. After cooling the homogeneous solution, the DBS nanofiber-liquid paraffin gel can be obtained.

[0038] (2) then by Haake torque rheometer by the ultra-high molecular weight polyethylene of 10% weight fraction, the DBS nanofiber-liquid paraffin gel of 89.5% weight fraction, the antioxidant dibutyltin maleate of 0.5% weight fraction Melt mixing to obtain ultra-high molecular weight polyethylene mixture. The melt mixing temperature is 170° C., the melt mixing time is 16 min, and the rotor speed is 80 rpm.

[0039] (3) Molding the ultra-high molecular weight polyethylene mixture into a flat film. The film thickness is controlled at 200um, the pressure is 5MPa, the molding temperature is 170°C, and the molding time is 6min.

[0040] (4) Next, the liquid paraffin is extracted with absolute eth...

Embodiment 3

[0043] (1) The antioxidant dibutyltin maleate of 30% by weight of ultra-high molecular weight polyethylene, 69% by weight of liquid paraffin, and 1% by weight of Haake torque rheometer is melt-mixed to obtain ultra-high-molecular-weight polyethylene vinyl mixture. The melt mixing temperature is 170° C., the melt mixing time is 12 min, and the rotor speed is 80 rpm.

[0044] (2) Molding the ultra-high molecular weight polyethylene mixture into a flat film. The film thickness is controlled at 200um, the molding temperature is 170°C, the molding time is 5min, and the pressure is 5MPa.

[0045] (3) Next, the liquid paraffin is extracted with absolute ethanol, washed with deionized water, and dried to form a microporous membrane.

[0046] (4) Finally, an oven is used to dry and anneal the microporous membrane to obtain an ultra-high molecular weight polyethylene microporous membrane. The drying temperature is 80°C, the drying time is 3 hours, the annealing temperature is 110°C, ...

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Abstract

The invention relates to a preparation method for an ultrahigh molecular weight polyethylene microporous membrane. The ultrahigh molecular weight polyethylene microporous membrane comprises 10 to 30 weight parts of polyethylene resin, 0 to 1 weight part of fiber nucleating agent, 69 to 89.5 weight parts of latent solvent and 0.5 to 1 weight part of antioxidant. By the method, the fiber nucleating agent generates nanofibers in a polymer / latent solvent matrix; and the generated nanofibers are dispersed in the polymer / latent solvent matrix well. The ultrahigh molecular weight polyethylene microporous membrane prepared by the method has smaller aperture, uniform aperture distribution and higher porosity. The ultrahigh molecular weight polyethylene microporous membrane has prominent mechanical property, in particular high tearing strength. Therefore, the microporous membrane prepared by the method can be applied to preparation of food, medicines and ultrapure water and meets the requirements of separation, purification, concentration and purification.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a method for preparing an ultra-high molecular weight polyethylene microporous membrane. The prepared ultra-high molecular weight polyethylene microporous membrane is especially used for microfiltration membranes or ultrafiltration membranes in water treatment processes. membrane. Background technique [0002] Compared with the traditional chemical separation process, membrane separation technology has been widely used in aerospace, biopharmaceuticals, petrochemicals, food, energy, seawater (brackish water) desalination, medical care, etc. due to its high efficiency, low energy consumption, and easy operation. and other fields, especially closely related to energy conservation, environmental protection, development and utilization of water resources and renewable resources. [0003] The content of membrane separation technology research, one is the prepar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/26B01D67/00B01D69/06
Inventor 刘思俊周持兴俞炜郑泓娄立娟
Owner SHANGHAI JIAO TONG UNIV
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