Method for preparing ethylene-trifluorochlor oethylene copolymer porous membrane
A technology of chlorotrifluoroethylene and copolymer, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as poor mechanical properties and low porosity, and achieve high mechanical strength, high porosity, The effect of broadening the range of concentration selection
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[0035] Example 1
[0036] The ethylene-chlorotrifluoroethylene copolymer and diethyl phthalate are composed of ethylene-chlorotrifluoroethylene copolymer with a mass percentage of 10% by weight, and diethyl phthalate with a mass percentage of 90wt%, put it into a high-temperature stirring tank and heat up to 240 degrees Celsius, stir and mix uniformly to form a homogeneous polymer solution, and let it stand for 24 hours. Then, the homogeneous polymer solution was directly hang-coated on the supporting net to form a flat film with a thickness of 200 μm, and then entered into a cooling liquid bath at 30° C. to solidify the solution into a film by phase separation. The cooling liquid was a water bath. The solidified flat membrane is extracted with ethanol and dried.
[0037] The cross-section of the membrane presents a uniform sponge-like structure, with a porosity of 84% and a breaking strength of 3.25MPa.
Example Embodiment
[0038] Example 2
[0039] The ethylene-chlorotrifluoroethylene copolymer and diethyl phthalate are composed of an ethylene-chlorotrifluoroethylene copolymer with a mass percentage of 28% by weight, and a diethyl phthalate with a mass percentage of 72wt%, put it into a high-temperature stirring tank and heat up to 240 degrees Celsius, stir and mix uniformly to form a homogeneous polymer solution, and let it stand for 24 hours. Then, the homogeneous polymer solution was directly hang-coated on the supporting net to form a flat film with a film thickness of 200 μm, and then entered into a cooling liquid bath at 30° C. to solidify the solution into a film by phases. The cooling liquid was a glycerin bath. The solidified flat membrane is extracted with ethanol and dried.
[0040] The cross-section of the membrane showed a uniform sponge-like structure, with a porosity of 71% and a breaking strength of 10.58MPa.
Example Embodiment
[0041] Example 3
[0042] The ethylene-chlorotrifluoroethylene copolymer and diethyl phthalate are composed of ethylene-chlorotrifluoroethylene copolymer with a mass percentage of 60% by weight, and diethyl phthalate with a mass percentage of 40wt%, put it into a high temperature stirring tank and heat to 250 degrees Celsius, stir and mix uniformly to form a homogeneous polymer solution, and let it stand for 24 hours. Then, the homogeneous polymer solution was directly hang-coated on the supporting net to form a flat film with a thickness of 200 μm, and then entered into a cooling liquid bath at 30° C. to solidify the solution into a film by phase separation. The cooling liquid was a water bath. The solidified flat membrane is extracted with ethanol and dried.
[0043] The cross-section of the membrane showed a uniform sponge-like structure, with a porosity of 31% and a breaking strength of 14.59MPa.
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