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Environment-friendly method for preparing fluorine-containing polymer microporous film

An environment-friendly and process technology, applied in the field of preparing fluorine-containing polymer microporous membranes, can solve the problems of complex post-treatment process, potential safety hazards, environmental pollution, etc., and achieve environmental friendliness, high penetration, and excellent mechanical properties. and the effect of separation performance

Active Publication Date: 2014-01-22
TIANJIN SEA WATER DESALINATION & COMPLEX UTILIZATION INST STATE OCEANOGRAPHI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Benzophenone is solid at room temperature, which means its post-processing process is more complicated, and its residual components will cause safety hazards in subsequent application processes
Triethyl phosphate is a low-toxic compound, but it pollutes the environment because it contains phosphorus

Method used

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  • Environment-friendly method for preparing fluorine-containing polymer microporous film
  • Environment-friendly method for preparing fluorine-containing polymer microporous film
  • Environment-friendly method for preparing fluorine-containing polymer microporous film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add solid-liquid mixture A consisting of 60 g of vinylidene fluoride-hexafluoropropylene copolymer resin and 140 g of 140 g of acetyl triethyl citrate into a stirring tank and mix. Heated to 160°C in a stirred tank, with a stirring speed of 100r / min, under nitrogen protection, stirred at a temperature of 160°C for 7 hours, and left to defoam for 24 hours to form a uniform casting solution; pass the formed casting solution through a hollow The fiber membrane forming machine is processed and formed into a hollow fiber membrane primary membrane; the primary membrane is immersed in a gel bath composed of a mixed solution of acetyl triethyl citrate and ethanol at 8°C to solidify and form, wherein the ethanol is in the gel bath The mass percentage content in the hollow fiber membrane is 85%; ethanol is used as the extractant to extract the acetyl triethyl citrate in the hollow fiber membrane, and then dried at room temperature to obtain the vinylidene fluoride-hexafluoropropyl...

Embodiment 2

[0027]Add solid-liquid mixture A consisting of 60 g of vinylidene fluoride-hexafluoropropylene copolymer resin and 140 g of 140 g of acetyl triethyl citrate into a stirring tank and mix. Heat to 170°C in a stirred tank, the stirring speed is 120r / min, under nitrogen protection, stir at 170°C for 12 hours, stand for defoaming for 24 hours, and form a uniform casting solution; pass the casting solution through a hollow fiber film forming machine Processing and molding to make a hollow fiber membrane nascent membrane; immerse the nascent membrane in a gel bath composed of a mixed solution of acetyl triethyl citrate and n-butanol at 5°C to solidify and form, wherein n-butanol is in the gel bath The mass percent content is 30%; use n-butanol as the extractant to extract the acetyl triethyl citrate in the hollow fiber membrane, and then dry it at room temperature to obtain the vinylidene fluoride-hexafluoropropylene copolymer hollow fiber membrane ; The rectification process is used...

Embodiment 3

[0030] Add solid-liquid mixture A consisting of 40 g of polyvinylidene fluoride resin and 160 g of tri-n-hexyl citrate into a stirring tank and mix. Heat to 160°C in a stirred tank, the stirring speed is 90r / min, under nitrogen protection, stir at 160°C for 10 hours, stand for defoaming for 24 hours, and form a uniform casting solution; pass the casting solution through a hollow fiber film forming machine Processing and molding to make a hollow fiber membrane nascent membrane; immerse the nascent membrane in a gel bath composed of a mixed solution of tri-n-hexyl citrate and ethanol at 10°C to solidify and form, wherein the mass percentage of ethanol in the gel bath is 30% %; using ethanol as an extractant to extract the tri-n-hexyl citrate in the hollow fiber membrane, and then drying at room temperature to obtain a polyvinylidene fluoride hollow fiber membrane; using a rectification process to separate the mixture of ethanol and tri-n-hexyl citrate , recovery of ethanol and t...

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Abstract

The invention discloses an environment-friendly method for preparing a fluorine-containing polymer microporous film. The method comprises steps of mixing fluorine-containing polymer and diluents, wherein the diluents are one or more than two of citrate, p-phenyl trimellitate, and diethylene glycol dibenzoate; heating to dissolve, and defoaming to form uniform casting film liquid; processing, solidifying and molding through natural cooling or gel bath; extracting the diluents in the film holes through an extraction agent so as to obtain the fluorine-containing polymer microporous film; and separating and recycling the formed extraction agent or diluents mixture through rectification. Compared with the prior art, the method uses a thermally induced phase separation principle so as to prepare the fluorine-containing polymer microporous film which has a bicontinuous pore structure with uniform fracture surfaces, has controllable cortex structure, and has high connectivity and excellent mechanical property; on the other hand, in the process of preparing the film, environment-friendly diluents and the extraction agent or diluents are combined and used in rectification separating and recycling, so that no contaminants are discharged, and the method is environment-friendly and is economic and feasible.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a process for preparing microporous membranes of fluorine-containing polymers by applying the principle of thermally induced phase separation. Background technique [0002] Micro and ultrafiltration membrane separation technology has attracted increasing attention due to its characteristics of energy saving, simple equipment, convenient operation, and no pollution. It is playing an increasingly important role in the fields of drinking water purification, efficient sewage treatment, and resource reuse. Membrane absorption technology and membrane distillation technology with hydrophobic microporous membrane as the core also play a major supporting role in "energy saving and emission reduction". Among them, the polymer microporous membrane material occupies a pivotal position in the above-mentioned membrane technology. High-performance membrane materials are...

Claims

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Application Information

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IPC IPC(8): B01D71/32B01D71/34B01D67/00B01D69/06B01D69/08
Inventor 郭春刚吕经烈刘国昌李晓明关毅鹏李浩
Owner TIANJIN SEA WATER DESALINATION & COMPLEX UTILIZATION INST STATE OCEANOGRAPHI
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