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
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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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