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High-density polyethylene hollow fiber microporous membrane and preparation method thereof

A high-density polyethylene and microporous membrane technology, applied in the field of membrane separation, can solve the problems of poor mechanical properties of fiber membranes, increased equipment investment, environmental pollution, etc., and achieve the effect of high permeation flux and high mechanical strength

Inactive Publication Date: 2012-07-04
TIANBANG NAT ENG RES CENT OF MEMBRANE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the "solution wet spinning method" used in the preparation of polyolefin hollow fiber membranes in the prior art uses a large amount of solvents in the process, and the mechanical properties of the obtained fiber membranes are poor. In the post-processing, the solvent system is recovered, separated and recycled. Utilization increases equipment investment and easily causes environmental pollution

Method used

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  • High-density polyethylene hollow fiber microporous membrane and preparation method thereof
  • High-density polyethylene hollow fiber microporous membrane and preparation method thereof
  • High-density polyethylene hollow fiber microporous membrane and preparation method thereof

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Embodiment 1

[0066] Select the molecular weight as 1.0(Mn)×10 -5 Polyethylene resin with a density of 0.995kg / m 3 , Melt index 1.1; process flow: melt spinning, cooling, winding, heat treatment, cold stretching, hot stretching, heat setting, testing. After the polyethylene resin is melted, the polyethylene melt is extruded from the spinneret by the screw extruder, and stretched under the action of winding tension. The melt spinning temperature is 180°C in zone 1, 200°C in zone 2, and 220°C in zone 3; the spinning / drawing speed ratio is 3000; the cooling air height is 330mm, and the cooling air temperature is 10±5°C; the obtained polyethylene hollow fiber is microporous The membrane properties are as follows: porosity 79.53%, pore diameter 40.6nm, specific surface area 451.39m 2 / g, apparent density 0.681g / cm 3 , breaking strength 58.6MPa, N 2 Flux 49×103L / m 2 ·h·0.1MPa, the water flux is 227L / m 2 · h · 0.1MPa.

Embodiment 2

[0068] The selected molecular weight is 5.0 (Mn) × 10 -5 Polyethylene resin with a density of 0.966kg / m3 and a melt index of 1.08; the process flow is: melt spinning, cooling, winding, heat treatment, cold stretching, hot stretching, heat setting, and testing. After the polyethylene resin is melted, the polyethylene melt is extruded from the spinneret by the screw extruder, and stretched under the action of winding tension. The melt spinning temperature is 190°C in zone 1, 210°C in zone 2, and 225°C in zone 3; the spinning / drawing speed ratio is 4000; the cooling air height is 300mm, and the cooling air temperature is 10±5°C; the obtained polyethylene hollow fiber has micropores The membrane properties are as follows: porosity 75.1%, pore diameter 33.2nm, specific surface area 288.94m 2 / g, apparent density 0.699g / cm 3 , breaking strength 60.3MPa, N 2 Flux 47×103L / m 2 ·h·0.1MPa, the water flux is 220L / m 2 · h · 0.1MPa.

[0069]

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Abstract

The invention discloses a high-density polyethylene hollow fiber microporous membrane and a preparation method thereof. The method is characterized by comprising the following process steps: melting spinning, cooling, winding, thermal treatment, cold stretching, thermal stretching, thermal sizing and testing. Polyethylene resin is performed with melting processing, and polyethylene melt flows out of a wire sprayer and is formed in stretching mode under effect of winding tension. The preparation method is low in device investment, small in energy consumption and free of environment pollution. Compared with other membrane materials, the prepared polyethylene hollow fiber microporous membrane is high in strength, resistant to serve conditions of acid, alkali and the like, resistant to corrosion of bacteria and the like, good in temperature resistance, in micropore state and in microcrack shape, causes no dissolve-out harmful substances in using process and can be stored in dry state.

Description

technical field [0001] The invention relates to the field of membrane separation, in particular to a high-density polyethylene hollow fiber microporous membrane and a preparation method thereof. Background technique [0002] Membrane separation has the characteristics of high separation efficiency, good selectivity, low energy consumption, no secondary pollution, and low equipment investment. It has been widely used in chemical, petroleum, electronics, medical, food, beverage, urban tap water engineering and environmental protection industries. Applications. The mechanical strength and chemical stability of microporous polyolefin hollow fiber membranes are superior to cellulose acetate and its derivative membranes, so they are widely used such as microfiltration, ultrafiltration, membrane distillation, and membrane extraction of blood oxygen. Hollow fiber membranes have many special and excellent properties, and more and more people pay attention to them. [0003] The holl...

Claims

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Application Information

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IPC IPC(8): B01D69/08B01D71/26B01D67/00
Inventor 徐俊峰陈翠仙尹中升俞锋葛洁
Owner TIANBANG NAT ENG RES CENT OF MEMBRANE TECH
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