Method for preparing ethylene-trifluorochlor oethylene copolymer porous membrane
A technology of chlorotrifluoroethylene and copolymers, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of poor mechanical properties and low porosity, and achieve high mechanical strength, high porosity, The effect of widening the concentration selection range
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Embodiment 1
[0036] With ethylene-chlorotrifluoroethylene copolymer and diethyl phthalate, its component is that the mass percent composition of ethylene-trifluoroethylene copolymer is 10wt%, and the mass percent composition of diethylphthalate is 90 wt%, put it into a high-temperature stirred tank and heat up to 240 degrees Celsius, stir and mix evenly to form a polymer homogeneous solution, and let it stand for 24 hours. Then the polymer homogeneous solution was directly hang-coated on the support net to form a flat film with a film thickness of 200 μm, and 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 cured flat film was extracted with ethanol and dried.
[0037]The cross-section of the membrane is a uniform sponge-like structure with a porosity of 84% and a breaking strength of 3.25MPa.
Embodiment 2
[0039] With ethylene-chlorotrifluoroethylene copolymer and diethyl phthalate, its component is that the mass percent composition of ethylene-trifluoroethylene copolymer is 28wt%, and the mass percent composition of diethylphthalate is 72 wt%, put it into a high-temperature stirred tank and heat up to 240 degrees Celsius, stir and mix evenly to form a polymer homogeneous solution, and let it stand for 24 hours. Then the polymer homogeneous solution was directly hang-coated on the support net to form a flat film with a film thickness of 200 μm, and entered into a cooling liquid bath at 30°C to solidify the solution into a film by phase separation. The cooling liquid was a glycerol bath. The cured flat film was extracted with ethanol and dried.
[0040] The cross-section of the membrane is a uniform sponge-like structure with a porosity of 71% and a breaking strength of 10.58MPa.
Embodiment 3
[0042] With ethylene-chlorotrifluoroethylene copolymer and diethyl phthalate, its component is that the mass percent composition of ethylene-trifluoroethylene copolymer is 60wt%, and the mass percent composition of diethylphthalate is 40 wt%, put it into a high-temperature stirred tank and heat up to 250 degrees Celsius, stir and mix evenly to form a polymer homogeneous solution, and let it stand for 24 hours. Then the polymer homogeneous solution was directly hang-coated on the support net to form a flat film with a film thickness of 200 μm, and 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 cured flat film was extracted with ethanol and dried.
[0043] The cross-section of the membrane is a uniform sponge-like structure with a porosity of 31% and a breaking strength of 14.59MPa.
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