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Preparation method of polyethylene hollow fiber membrane with aperture in gradient distribution

A technology of gradient distribution and polyethylene, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of large flux, low retention efficiency, high porosity, high flux, etc., and achieve good retention effect , high porosity, good toughness

Inactive Publication Date: 2011-11-09
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the contradictions of large flux and low interception efficiency existing in the existing polyethylene membrane materials, the present invention provides a preparation method of a polyethylene hollow fiber membrane with a gradient distribution of pore diameters. Characterized by pore size, high porosity and high flux

Method used

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  • Preparation method of polyethylene hollow fiber membrane with aperture in gradient distribution
  • Preparation method of polyethylene hollow fiber membrane with aperture in gradient distribution
  • Preparation method of polyethylene hollow fiber membrane with aperture in gradient distribution

Examples

Experimental program
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Effect test

Embodiment 1

[0069] With 30wt% high-density polyethylene (Qilu Petrochemical J7000), 70wt% di-n-octyl phthalate, 0.5wt% 2,6-di-tert-butyl p-cresol antioxidant additive (based on high-density polyethylene and The total weight of di-n-octyl phthalate), melted at 185°C to form a homogeneous solution, controlled pressure 0.20MPa, extruded the homogeneous solution through a self-made spinning machine at 145°C to obtain hollow filaments, and the spinneret The type of spinneret normally used for the production of hollow fibers is used. The hollow spinneret is a sleeve-type spinneret with an air supply pipe inside, and the central air supply pipe is fed with nitrogen at a pressure of 20 cm water column, and the nitrogen temperature is 80 ° C after being heated by the homogeneous solution. The hollow fiber first passes through a 10cm air gap, the air temperature is 35°C, and then quenched in a 50°C water bath to separate the phases and solidify the hollow fiber into shape. Soak the hollow filament...

Embodiment 2

[0071] The same method as in Example 1 was followed except that a continuous stretching process was added before the extraction process. The stretching temperature was 50°C, and the stretching ratio was 125%. The performance of the membrane is shown in Table 1, and the gas flux and pore size are significantly improved.

Embodiment 3

[0073] The same method as in Example 1 was followed except that a continuous stretching process was added before the extraction process. The stretching temperature was 50°C, and the stretching ratio was 145%. The properties of the membrane are shown in Table 1. The obtained hollow fiber membrane has very high gas flux, large pore size and porosity.

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Abstract

The invention discloses a preparation method of polyethylene hollow fiber membrane with the aperture in gradient distribution, comprising the following steps: (1) adding material compositions, and fusing at the temperature from 160 DEG C to 250 DEG C to form homogeneous phase solution, wherein the material compositions comprise polyethylene and diluent which have thermal liquid-liquid separation points; (2) adopting a spinning machine to squeeze the homogeneous phase solution and spin to obtain hollow yarns, and cooling, solidifying and forming by gradients; (3) removing the diluent by an extraction process; and (4) carrying out tensioning thermoforming to the hollow yarns obtained in the step (3) to obtain the polyethylene hollow fiber membrane with the aperture in gradient distribution.The prepared polyethylene hollow fiber membrane has the characteristics of small surface aperture, large internal aperture, high porosity factor and high flux.

Description

(1) Technical field [0001] The invention relates to a preparation method of a polyethylene hollow fiber membrane with a gradient distribution of apertures. The polyethylene hollow fiber membrane with a gradient distribution of apertures is suitable for domestic water purifiers, sewage treatment, reclaimed water reuse and continuous microfiltration technology. (2) Technical background [0002] Polyethylene microporous membrane is a membrane material with excellent functions, which is widely used in microfiltration, sewage treatment, plasma separation, battery separator, etc. Polyethylene is a high crystallinity polymer material, and there are two main methods for its film production, melt extrusion-stretching method and thermally induced phase separation method. [0003] The melt extrusion-stretching method is the melt extrusion of pure polymer melts, and many lamellar structures arranged in parallel perpendicular to the extrusion direction will be formed in the melt. During ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/08B01D71/26
Inventor 王建黎
Owner ZHEJIANG UNIV OF TECH
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