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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

Active Publication Date: 2013-05-22
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is simple and easy to control, but the prepared membranes are all sporopore structures, which have low porosity and poor mechanical properties.

Method used

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  • Method for preparing ethylene-trifluorochlor oethylene copolymer porous membrane
  • Method for preparing ethylene-trifluorochlor oethylene copolymer porous membrane
  • Method for preparing ethylene-trifluorochlor oethylene copolymer porous membrane

Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention discloses a method for preparing an ethylene-trifluorochlor oethylene copolymer porous membrane, and belongs to the fields of high polymer material science and technology. In the method, a proper solvent, namely diethyl phthalate is provided, and the ethylene-trifluorochlor oethylene copolymer porous membrane is prepared by initiating phase separation by reducing the temperature of an ethylene-trifluorochlor oethylene copolymer / diethyl phthalate system. When the polymer concentration is lower than 60 weight percent, the section of the ethylene-trifluorochlor oethylene copolymer porous membrane has a uniform spongeous structure. By controlling the conditions such as the concentration of the ethylene-trifluorochlor oethylene copolymer, cooling rate and the like, the microstructure of the membrane can be controlled.

Description

technical field [0001] The invention relates to a method for preparing a porous membrane of ethylene-chlorotrifluoroethylene copolymer, in particular, the preparation of ethylene-chlorotrifluoroethylene copolymer by using a thermally induced phase separation method using diethyl phthalate as the main diluent The method for a porous membrane belongs to the field of polymer material science and technology. Background technique [0002] Ethylene-chlorotrifluoroethylene copolymer is a nearly 1:1 alternating copolymer of chlorotrifluoroethylene and ethylene. Since ethylene and chlorotrifluoroethylene alternately form chain links at 1:1, the thermoplastic processing performance is greatly improved, and the original excellent properties of polychlorotrifluoroethylene homopolymer can be maintained, especially heat resistance (decomposition temperature 350 ℃), chemical resistance and weather resistance. The corrosion resistance of ethylene-chlorotrifluoroethylene copolymer is equiv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/32B01D67/00B01D69/08
Inventor 王晓琳周波林亚凯田野
Owner TSINGHUA UNIV
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