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Method for preparing super high molecular polythene porous membrane by thermally phase separation method

A thermally induced phase separation method, ultra-high molecular weight technology, applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc. , The effect of narrow pore size distribution and uniform pore size

Inactive Publication Date: 2008-04-23
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the obtained porous membranes generally have low porosity and poor pore structure, so it is difficult to apply them in practice.

Method used

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  • Method for preparing super high molecular polythene porous membrane by thermally phase separation method
  • Method for preparing super high molecular polythene porous membrane by thermally phase separation method
  • Method for preparing super high molecular polythene porous membrane by thermally phase separation method

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Ultra-high molecular weight polyethylene, the weight average molecular weight is 1,500,000, and the diluent is white oil. Its components are 15% ultra-high molecular weight polyethylene and 85% white oil. Heat up to 200°C in a high-temperature stirred tank, stir and mix evenly. The obtained polymer homogeneous solution was directly coated on the template to obtain a flat film, the biaxial stretching temperature was 120° C., and the bidirectional stretching ratio was 1.5 times. The cooling bath chooses water as the cooling liquid. Immersed in cooling liquid to make the solution phase-separated and solidified to form a film, then extracted with dichloromethane and dried. The thickness of the obtained flat film was 150 μm, the cross-sectional pore structure of the film was a branch-like pore structure, the average internal pore diameter was 2 μm, and the porosity was 65%.

Embodiment 2

[0033] Ultra-high molecular weight polyethylene, the weight average molecular weight is 3,000,000, and the diluent is white oil. Its components are 15% ultra-high molecular weight polyethylene and 85% white oil. Heat up to 200°C in a high-temperature stirred tank, stir and mix evenly. The polymer homogeneous solution and the liquid forming the inner cavity of the fiber are extruded through a double-tube die (patent publication No. CN1556833A disclosed) to obtain a hollow fiber membrane, and the liquid forming the inner cavity of the fiber is ethylene glycol. The stretching temperature is 120° C., and the stretching ratio is 1.5 times. The cooling bath chooses water as the cooling liquid. Immersed in cooling liquid to make the solution phase-separated and solidified to form a film, then extracted with dichloromethane and dried. The inner diameter of the obtained hollow fiber membrane is 2.5 mm, the wall thickness is 1 mm, the cross-sectional pore structure of the membrane is...

Embodiment 3

[0035] Ultra-high molecular weight polyethylene, the weight average molecular weight is 2,000,000, and the diluent is paraffin oil. Its components are 60% ultra-high molecular weight polyethylene and 40% paraffin oil. Heating in a high-temperature kettle to 200°C, stirring and mixing evenly, the polymer homogeneous solution and the liquid forming the inner cavity of the fiber are extruded through a double-tube die to obtain a hollow fiber membrane, and the liquid forming the inner cavity of the fiber is water. The stretching temperature is 120° C., and the stretching ratio is 3 times. The cooling bath chooses water as the cooling liquid. Immersed in cooling liquid to make the solution phase-separated and solidified to form a film, then extracted with ethanol and dried. The inner diameter of the obtained hollow fiber membrane is 2.5 mm, the wall thickness is 1 mm, the cross-sectional pore structure of the membrane is a branch-like pore structure, the inner average pore diamet...

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Abstract

The present invention relates to a preparation method of ultrahigh molecutar weight polyethylene porous membrane, specially, it relates to a method for preparing high-performance ultrahigh molecular weight polyethylene (UHMWPE) porous membrane by adopting thermal phase separation process. It is characterized by that it uses a high-temperature-resistant solvent-resistant high-strength ultrahigh molecular weight polyethylene resin as membrane material, under the action of diluting agent said invention makes the polyethylene resin membrane material undergo the processes of solution preparation, extrusion, drawing, cooling extraction and recovering extracting agent so as to obtain the invented ultrahigh molecular weight polyethylene porous membrane. The described diluting agent can be selected from white camphor oil, paraffin and paraffin oil.

Description

technical field [0001] The invention relates to a method for preparing an ultrahigh molecular weight polyethylene porous membrane, in particular to a method for preparing a high performance ultrahigh molecular weight polyethylene (UHMWPE) porous membrane by adopting a heat-induced phase separation method. Background technique [0002] Ultra-high molecular weight polyethylene is a kind of engineering plastic with excellent performance, usually its molecular weight is between 500,000 and 8,000,00. Due to the extremely high molecular weight of ultra-high molecular weight polyethylene, it produces extremely excellent properties. Ultra-high molecular weight polyethylene not only has excellent mechanical properties, including friction resistance, impact resistance, and solvent resistance, but also has excellent temperature resistance, and its low temperature can be used at -269°C. [0003] Although ultra-high-molecular-weight polyethylene has excellent properties, microporous mem...

Claims

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Application Information

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IPC IPC(8): B01D71/26B01D67/00
Inventor 丁怀宇李兰王丽华刘必前
Owner INST OF CHEM CHINESE ACAD OF SCI
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