Hydrophilic modified preparation method for polyethylene hollow fiber microporous membrane

A polyethylene and microporous membrane technology, applied in chemical instruments and methods, fiber treatment, membrane technology, etc., can solve the problems of poor modification effect, cumbersome steps, harsh modification conditions, etc. It is easy to operate, the film making process is simple, and the required amount is small.

Inactive Publication Date: 2005-08-17
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the general modification method has cumbersome steps, some modification conditions are relatively harsh, and some modification effects are not good, which limits its industrial application.

Method used

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  • Hydrophilic modified preparation method for polyethylene hollow fiber microporous membrane
  • Hydrophilic modified preparation method for polyethylene hollow fiber microporous membrane
  • Hydrophilic modified preparation method for polyethylene hollow fiber microporous membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Polyethylene resin (Japan Mitsui Petrochemical Co., Ltd., melt index 5.4g / 10min) and cellulose acetate-butyrate (Wuxi Chemical Research and Design Institute) were melt blended at 140°C, the weight percentage of cellulose acetate-butyrate 0.03%, and granulated. Then the blended pellets are fed into a spinning machine, and the hollow fiber membrane is prepared through a melt spinning-stretching process. The spinning conditions are as follows: the hollow spinneret is a sleeve-type spinneret with an air supply pipe inside, nitrogen is fed into the central air supply pipe, and the pressure is 15 mm of water column. The spinning temperature of the spinneret is about 169°C. The winding speed of the hollow fiber was 180 m / min, and the draft ratio was 1200. The prepared hollow fiber wound filaments were heat-treated at 105°C for 2h, and then stretched directly. Stretching conditions were as follows: cold stretching at 25° C. at a stretching rate of 12 cm / min, with a stretchin...

Embodiment 2

[0060] Polyethylene resin (Japan Mitsui Petrochemical Co., Ltd., melt index 5.4g / 10min) and cellulose acetate-butyrate (Wuxi Chemical Research and Design Institute) were melt blended at 150°C, the weight percentage of cellulose acetate-butyrate 0.04%, and granulated. Then the blended pellets are fed into a spinning machine, and the hollow fiber membrane is prepared through a melt spinning-stretching process. The spinning conditions are as follows: the hollow spinneret is a sleeve-type spinneret with an air supply pipe inside, nitrogen is fed into the central air supply pipe, and the pressure is 17 mm of water column. The spinning temperature of the spinneret is about 172°C. The winding speed of the hollow fiber was 200 m / min, and the draft ratio was 1300. The prepared wound hollow fiber was heat-treated at 110°C for 3h, and then stretched directly. Stretching conditions were as follows: cold stretching at 30° C. at a stretching rate of 17 cm / min, with a stretching ratio of ...

Embodiment 3

[0063] Polyethylene resin (Mitsui Petrochemical Co., Ltd., melt index 5.4g / 10min) and cellulose acetate-butyrate (Wuxi Chemical Research and Design Institute) were melt blended at 160°C, the weight percentage of cellulose acetate-butyrate 0.04%, and granulated. Then the blended pellets are fed into a spinning machine, and the hollow fiber membrane is prepared through a melt spinning-stretching process. The spinning conditions are as follows: the hollow spinneret is a sleeve-type spinneret with an air supply pipe inside, nitrogen is fed into the central air supply pipe, and the pressure is 19 mm of water column. The spinning temperature of the spinneret is about 178°C. The winding speed of the hollow fiber was 240 m / min, and the draft ratio was 1600. The prepared wound hollow fiber was heat-treated at 115°C for 2 hours, and then stretched directly. Stretching conditions were: cold stretching at 32° C. at a stretching rate of 27 cm / min, with a stretching ratio of 50%, and the...

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Abstract

The present invention discloses preparation process of hydrophilic modified hollow microporous polyethylene film. Some hydrophilic matters with relatively high surface energy are used to mix with fused polyethylene. The present invention features that the prepared hollow microporous polyethylene film has improved hydrophilicity, including contact angle reduced by over 20 deg, film porosity of 40-80 %, average pore size of 0.1-0.5 micron and air permeability of 0.01-1 cu cm/sq cm.s.cmHg. The film has inner diameter of 250-500 microns and thickness of 30-60 microns. The prepared hollow microporous polyethylene film of the present invention has average pore size, porosity and hydrophilicity much higher than those of hollow polyethylene fiber film prepared through fusion spinning-stretching process, and has no obvious change in tension strength, rebound degree, etc.

Description

technical field [0001] The invention relates to a preparation method for hydrophilic modification of a polyethylene hollow fiber microporous membrane. Background technique [0002] Polyethylene hollow fiber membrane is a membrane material with excellent functions. The earliest polyethylene hollow fiber membranes were mainly prepared by thermally induced phase separation. US Patents 3,423,491 and 4,020,230 respectively reported polyethylene hollow fiber microporous membranes prepared by this method. The main steps are to melt and blend polyethylene resin with some low molecular weight esters, polyethylene glycol and other polymers to prepare hollow fiber products, and then extract these low molecular weight substances to obtain polyethylene hollow fiber membrane materials. According to US Patent 3423491, the hollow fiber microporous membrane prepared by this method can be used as a membrane for reverse osmosis, and the desalination rate can reach more than 75%. The maximum ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/08D01D5/12D02J1/22D06M15/05
Inventor 徐又一杜春慧朱宝库
Owner ZHEJIANG UNIV
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