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A high-flux polymer separation membrane, preparation method, diluent composition and application

A diluent and porous membrane technology, which is applied in the field of polymer separation membrane preparation, can solve the problem that the microporous membrane is easy to form a closed cell-like pore structure, and achieve the effect of improving the pure water flux

Active Publication Date: 2020-12-25
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The biggest disadvantage of making microporous membranes by the TIPS method is that it is easy to form a closed cell-like pore structure

Method used

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  • A high-flux polymer separation membrane, preparation method, diluent composition and application
  • A high-flux polymer separation membrane, preparation method, diluent composition and application
  • A high-flux polymer separation membrane, preparation method, diluent composition and application

Examples

Experimental program
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Effect test

Embodiment 1

[0090] Accurately weigh 70g of diluent (tributyl acetyl citrate: dioctyl terephthalate = 1:1), 30g of ECTFE (Halar® 902), ECTFE mass fraction is 30%, stir well and pour into 500 mL In the high-temperature container, the temperature of the oil bath used was 250 °C, nitrogen was used as the protective gas, and then the solution was stirred with an electric stirrer for 4 h, and then left in the oil bath for defoaming for 4 h; the obtained film solution was poured into a self-made mold Medium-press to form a film, then put the mold into a water quenching bath (20-25°C) to solidify to form a film; put the obtained film in an ethanol solution for extraction for a certain period of time, and extract the diluent to obtain an ECTFE porous film.

Embodiment 2

[0092] Accurately weigh 70g of diluent (tributyl acetyl citrate: dioctyl terephthalate = 3:1), 30g of ECTFE (Halar® 902), ECTFE mass fraction is 30%, stir well and pour into 500 mL In the high-temperature container, the temperature of the oil bath used was 250 °C, nitrogen was used as the protective gas, and then the solution was stirred with an electric stirrer for 4 h, and then left in the oil bath for defoaming for 4 h; the obtained film solution was poured into a self-made mold Medium-press to form a film, then put the mold into a water quenching bath (20-25°C) to solidify to form a film; put the obtained film in an ethanol solution for extraction for a certain period of time, and extract the diluent to obtain an ECTFE porous film.

Embodiment 3

[0094] Accurately weigh 70g of diluent (acetyl tributyl citrate: dioctyl terephthalate = 1:3), 30g of ECTFE (Halar® 902), ECTFE mass fraction is 30%, stir well and pour into 500 mL In the high-temperature container, the temperature of the oil bath used was 250 °C, nitrogen was used as the protective gas, and then the solution was stirred with an electric stirrer for 4 h, and then left in the oil bath for defoaming for 4 h; the obtained film solution was poured into a self-made mold Medium-press to form a film, then put the mold into a water quenching bath (20-25°C) to solidify to form a film; put the obtained film in an ethanol solution for extraction for a certain period of time, and extract the diluent to obtain an ECTFE porous film.

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PUM

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Abstract

The invention provides a high-throughput polymer separation membrane, a preparation method, a diluent composition and an application, and belongs to the technical field of preparation of polymer separation membranes. The invention relates to a method for preparing an ECTFE porous membrane by adopting a two-element diluent through a thermally-induced phase separation method. The method comprises the following steps: with 15 to 70 wt% of an ECTFE polymer and two solvents with a total mass percentage of 30 to 85 wt% as the two-element diluent for preparation of a membrane casting solution, subjecting the ECTFE polymer and two solvents to heating under stirring and carrying out standing and defoaming, or mixing the ECTFE polymer and two solvents through a double screw extruder so as to preparea polymer homogeneous membrane casting solution; scraping the casting solution into a plate shape or into a hollow fiber shape through spinning of a spinning nozzle, then carrying out soaking in a cooling liquid, carrying out quenching, and carrying out curing so as to form a membrane; and soaking the formed film into an extractant, allowing the diluent to be extracted out of the formed membrane,and carrying out drying in the air so as to prepare the ECTFE porous membrane. The invention is characterized by adopting two environment-friendly solvents as the two-element diluent for preparationof the ECTFE porous membrane; the preparation process is simple and has green and environment-friendly process; and the ECTFE porous membrane prepared by using the preparation process provided by theinvention has large throughput which is improved by 1.5 times or above compared with the throughput of the ECTFE porous membrane prepared by using a single diluent.

Description

technical field [0001] The invention provides a high-flux polymer separation membrane, a preparation method, a diluent composition and applications, and particularly relates to a high-flux ethylene-chlorotrifluoroethylene prepared by using a thermally induced phase separation method using a mixed diluent. The membrane method belongs to the technical field of polymer separation membrane preparation. Background technique [0002] For decades, membrane separation technology has gradually replaced or improved many traditional filtration processes in its application process. As a unique separation technology, it has become one of the indispensable important means to ensure product quality in modern industry, especially in high-tech, precision and cutting-edge technology industries, such as electronics, biopharmaceuticals, scientific research, and quality inspection. . Due to the excellent functions and characteristics of fluoropolymers, they have been used in the construction i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/30B01D69/08B01D69/06B01D67/00C02F1/44C02F103/04
CPCB01D67/0011B01D69/06B01D69/08B01D71/30C02F1/44
Inventor 崔朝亮汪朝晖徐克汪效祖邢卫红范益群
Owner NANJING TECH UNIV
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