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Preparation method of ultra-high molecular weight polyethylene composite microporous membrane

An ultra-high molecular weight polyethylene technology, which is applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc. problems such as poor penetration, to achieve the effects of improved mechanical properties, high porosity, and improved membrane strength

Active Publication Date: 2015-03-25
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is often difficult to control the thickness of the membrane prepared by melting and mixing ultra-high molecular weight polyethylene and diluent-compression molding and removing the diluent, and the micropore penetration is not strong, and most of them are closed pores, resulting in small water flux.
However, the ultra-high molecular weight polyethylene microporous membrane produced by the gel extrusion-biaxial stretching method is easy to deform during use, and the film-making equipment is expensive, and the control of the biaxial stretching process is also relatively cumbersome.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Arrange the long-fiber polyester base in water containing detergent, shake and wash at 60°C for 5 minutes, then rinse repeatedly with deionized water, and then dry. Place the long-fiber polyester base fabric after desizing and drying in dimethyl sulfoxide for etching treatment. The treatment temperature is 120°C and the treatment time is 5 minutes. After washing and drying, the weight loss rate of the base fabric is 10%, and the thickness is about 150 μm.

[0026] 5% by weight of ultra-high molecular weight polyethylene, 94.98% by weight of liquid paraffin, 0.02% by weight of antioxidant 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid The octadecyl alcohol ester is melt mixed, extruded and pelletized to obtain an ultra-high molecular weight polyethylene mixture. The temperature of the twin-screw extruder from the feed section to the compression extrusion section is 80°C to 220°C, increasing sequentially, and the screw speed is 80rpm.

[0027] Lay ultra-high molec...

Embodiment 2

[0030] Arrange high-count polyester cotton in water containing detergent, shake and wash at 60°C for 5 minutes, then rinse repeatedly with deionized water, and then dry. Put the high-count polyester cotton cloth after desizing and drying in dimethyl sulfoxide for etching treatment, the treatment temperature is 160°C, and the treatment time is 10 minutes. After washing and drying, the weight loss rate of the base fabric is 50%, and the thickness is about 180 μm .

[0031] 10% by weight of ultra-high molecular weight polyethylene, 89% by weight of decane, 1% by weight of antioxidant 2,2'-ethylenebis(4,6-di-tert-butylphenyl)fluorine The phosphite is melted and mixed, extruded and pelletized to obtain an ultra-high molecular weight polyethylene mixture. The temperature of the twin-screw extruder from the feed section to the compression extrusion section is 80°C to 220°C, increasing sequentially, and the screw speed is 90rpm.

[0032] The mixture melted and mixed by the twin-scre...

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Abstract

The invention relates to a preparation method of an ultra-high molecular weight polyethylene composite microporous membrane. The preparation method comprises the following steps: (1) carrying out desizing treatment on base cloth which is high-temperature-resistant cloth, then drying, and performing pretreatment with pretreating agents; (2) weighing ultra-high molecular weight polyethylene, diluents and antioxidants in parts by weight, melting and mixing by a double-screw extruder, performing hot-pressing combination on the mixture and the base cloth to obtain a composite jelly membrane by a continuous extrusion process or a gap type mold-pressing process; and (3) removing the diluents in the composite jelly membrane by extraction agents, drying and shaping to obtain the composite microporous membrane. According to the preparation method, the ultra-high molecular weight polyethylene enters the inside of the cloth sufficiently to form a penetrating network, the combined membrane has good penetrating property, high water flux and high mechanical property improved greatly, and the prepared microporous membrane can be used for production of foods, medicines, and ultrapure water, and can meet the requirements of separation, purification, concentration and purification.

Description

technical field [0001] The invention belongs to the field of composite microporous membranes, and in particular relates to a preparation method of ultrahigh molecular weight polyethylene composite microporous membranes. Background technique [0002] Microfiltration is an important membrane separation process, widely used in industrial sewage treatment, drinking water preparation, food industry, medical and health, military industry and other industries. The so-called microporous film composite filter medium is a new type of filter material that is combined with a layer of microfiltration membrane and conventional woven filter medium. Generally, the materials of each layer of the composite filter medium are different, and there is a clear division of labor. The filter layer and the support layer are two parts. At present, the microporous film composite filter media developed at home and abroad are all coated fabrics. [0003] The so-called coated fabric, that is, film + bas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/26B01D69/12B01D67/00
Inventor 于俊荣刘蓉诸静王彦胡祖明
Owner DONGHUA UNIV
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