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Method for preparing fluorocarbon polymer microporous film with interpenetrating network bicontinuous pore structure

A fluorocarbon polymer and interpenetrating network technology, applied in the field of membrane separation, can solve the problems of high energy consumption and high requirements, and achieve high rejection rate and excellent mechanical properties

Active Publication Date: 2011-08-24
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The PVDF hollow fiber microporous membrane prepared by this method has the characteristics of high strength, high crystallinity, and high flux. However, this method has high requirements for equipment and high energy consumption.

Method used

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  • Method for preparing fluorocarbon polymer microporous film with interpenetrating network bicontinuous pore structure
  • Method for preparing fluorocarbon polymer microporous film with interpenetrating network bicontinuous pore structure
  • Method for preparing fluorocarbon polymer microporous film with interpenetrating network bicontinuous pore structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] At a temperature of 80°C and an air humidity of 50%, the vinylidene fluoride-hexafluoropropylene copolymer with a mass percentage of 12% was stirred and dissolved in a mass percentage of 88% by mass at a stirring speed of 150 rpm. % of tetramethylurea, the stirring time is 24 hours, and then stand at 80 ° C for 24 hours to form a metastable equilibrium casting solution; the casting solution is processed and formed by a flat composite film forming machine The primary film of the flat composite film is controlled to evaporate in the air for 5 seconds; the primary film is immersed in the first coagulation bath composed of pure water at 28°C for 30 minutes, and then the film is transferred to the pure water at 28°C. In the second coagulation bath composed of water for 30 minutes; after removing the residual solvent, dry it to obtain a flat vinylidene fluoride-hexafluoropropylene copolymer flat composite ultrafiltration membrane with an interpenetrating network double continu...

Embodiment 2

[0033] At a temperature of 60°C and an air humidity of 60%, polyvinylidene fluoride was stirred and dissolved in a mixed solvent of hexamethylphosphoramide and triethyl phosphate at a stirring speed of 300 rpm. In terms of content, in the whole solution, the content of polyvinylidene fluoride is 15%, the content of hexamethylphosphoramide is 20%, the content of triethyl phosphate is 65%, the stirring time is 24 hours, and then at 60 ℃ Leave standstill for 12 hours for defoaming to form a metastable equilibrium casting solution; the casting solution is processed and formed into a flat film nascent film by a flat film film forming machine, and its evaporation time in air is controlled to be 10 seconds; The nascent film was immersed in the first coagulation bath composed of a mixed solution of triethyl phosphate and water at 30°C for 10 seconds, wherein the mass percentage of triethyl phosphate in the mixed solution was 70%, and then the film was transferred to Put in the second ...

Embodiment 3

[0037] At a temperature of 60°C and an air humidity of 60%, stir and dissolve polyvinylidene fluoride with a mass percentage of 15% in 85% of hexamethyl at a stirring speed of 300 rpm In phosphoramide, the stirring time is 36 hours, and then stand at 60°C for 12 hours to defoam to form a metastable equilibrium casting solution; the casting solution is processed by a flat film forming machine to form a flat film primary film, And control its evaporation time in the air to be 10 seconds; immerse the nascent film in the first coagulation bath composed of a mixed solution of hexamethylphosphoramide and water at 30°C for 10 seconds, wherein hexamethylphosphoramide is in the mixed solution The mass percent content is 70%, and then the film is transferred to the second coagulation bath composed of a mixed solution of ethanol and pure water at a temperature of 30 ° C for 12 hours, wherein the mass percent content of ethanol in the mixed solution is 30 %; After removing the residual so...

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Abstract

The invention discloses a method for preparing a fluorocarbon polymer microporous film with an interpenetrating network bicontinuous pore structure. The method comprises the following steps: dissolving the fluorocarbon polymer in a non-excellent solvent under conditions of constant temperature, constant humidity, constant time and constant stirring speed to prepare metastable state casting solution; defoaming the casting solution, controlling the evaporating time; curing to form by adopting a twice coagulating bath mode; and removing residual solvent, and airing to obtain the fluorocarbon polymer microporous film with the interpenetrating network bicontinuous pore structure. Compared with the prior art, in the invention, a method of combining non-solvent inductive phase separation and thermally induced phase separation is adopted to prepare a series of microporous films with the interpenetrating network bicontinuous pore structure, which have controllable structure and uniform section, and can completely eliminate large finger-type pores; and the microporous film has super large flux, high removal rating and excellent mechanical performance, can be particularly used as microfiltration films or superfiltration films, and can be applied to water resource purification and treatment.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a preparation method of a fluorocarbon polymer microporous membrane with an interpenetrating network double continuous pore structure. Background technique [0002] In the purification and treatment of water resources, membrane water treatment technology has been widely used in the field of gas-liquid and liquid-liquid separation due to its high efficiency, low cost, environmental protection, normal temperature operation, and no chemical changes. Among them, ultrafiltration (UF) and microfiltration (MF) are the two most important membrane separation processes, and ultrafiltration membranes and microfiltration membranes account for about 40% of the entire membrane market. The process of microfiltration and ultrafiltration membrane is based on the pore size screening mechanism. Among them, the average pore size of microfiltration is 0.1 micron to 10 microns,...

Claims

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Application Information

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IPC IPC(8): B01D71/32B01D67/00
Inventor 刘富陶咪咪薛立新
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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