Preparation method for anti-pollution PVDF (polyvinylidene fluoride) separation film

An anti-pollution and separation membrane technology, applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the unreported problems of anti-pollution PVDF separation membrane, etc. It is easy to implement in industrialization, improves anti-pollution performance, and is good The effect of inhibiting adsorption

Inactive Publication Date: 2014-12-03
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the research field of PVDF anti-fouling membranes, the use of chitin to modify PVDF separation membrane materials, and the research on anti-fouling PVDF separation membranes have not been reported.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Preparation of chitin solution. A certain amount of commercially available LiCl was weighed at a mass ratio of 5%, added to 20 mL of DMAc, and stirred at room temperature until the LiCl was completely dissolved; 0.1 g of chitin was added to the solution, stirred and dissolved to form a chitin solution.

[0018] (2) Preparation of chitin-modified PVDF casting solution. Weigh PVDF and add it to a container containing 20ml of chitin solution, so that the mass ratio of PVDF to DMAc is 15%, and the mass ratio of PVDF to chitin is 1:0.03. Place the above container in a 60°C water bath, stir and dissolve to obtain a cast film liquid.

[0019] (3) Preparation of chitin-modified PVDF separation membrane. Pour the casting solution on a glass plate and scrape it into a film, immerse in a coagulation bath constant temperature water tank at 25°C, after the film forms and falls off the glass plate, place it in distilled water for 36 hours, wash it with distilled water to obtain...

Embodiment 2

[0021] (1) Preparation of chitin solution. Weigh a certain amount of commercially available LiCl at a mass ratio of 8%, add it to 40ml of DMAc, and stir at room temperature until the LiCl is completely dissolved; add 0.3g of chitin to the solution, stir and dissolve to form a chitin solution.

[0022] (2) Preparation of chitin-modified PVDF casting solution. Weigh PVDF and add it to a container containing 40ml of chitin solution, so that the mass ratio of PVDF to DMAc is 18%, and the mass ratio of PVDF to chitin is 1:0.04. Place the above container in a 60°C water bath, stir and dissolve to obtain a casting film liquid.

[0023] (3) Preparation of chitin-modified PVDF separation membrane: Pour the casting solution on a glass plate to scrape it into a film, immerse it in a coagulation bath constant temperature water tank at 30°C, and place the film in distilled water for 24 hours after forming and falling off the glass plate , washed with distilled water to obtain an anti-fou...

Embodiment 3

[0025] (1) Preparation of chitin solution. A certain amount of commercially available LiCl was weighed at a mass ratio of 6%, added to 20 mL of DMAc, and stirred at room temperature until the LiCl was completely dissolved; 0.2 g of chitin was added to the solution, stirred and dissolved to form a chitin solution.

[0026] (2) Preparation of chitin-modified PVDF casting solution. Weigh PVDF and add it to a container containing 20ml of chitin solution, so that the mass ratio of PVDF to DMAc is 16%, and the mass ratio of PVDF to chitin is 1:0.06. Place the above container in a 60°C water bath, stir and dissolve to obtain a casting film liquid.

[0027] (3) Preparation of chitin-modified PVDF separation membrane: Pour the casting solution on a glass plate to scrape it into a film, immerse it in a coagulation bath constant temperature water tank at 25°C, and place the film in distilled water for 24 hours after forming and falling off the glass plate , washed with distilled water ...

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Abstract

The invention discloses a preparation method for an anti-pollution PVDF (polyvinylidene fluoride) separation film, belongs to the technical field of films, and in particular relates to an anti-pollution macromolecular film technology. The invention provides a preparation method for a hydrophilization and anti-pollution PVDF separation film in order to solve the technical problem. The preparation method is characterized in that chitosan which is strong in hydrophilicity and pollution-resistant is added to PVDF. No special equipment is needed during product preparation; industrial implementation is easy, and the technology is simple in general. The separation film product has an extremely good anti-adsorption effect on bovine serum albumin; the flux recovery rate of the separation film in which the mass ratio of PVDF to chitosan is 1 to 0.1 and which is filtered by a bovine serum albumin solution is over 95 percent. The anti-pollution PVDF separation film prepared by the preparation method disclosed by the invention integrates the advantages of the PVDF separation film and the anti-pollution performance and the hydrophilicity of chitosan, so that the physical performance of the film is stable, and the pure water flux is increased.

Description

technical field [0001] The invention belongs to the field of membrane technology, in particular to an anti-pollution polymer membrane technology. Background technique [0002] Membrane fouling refers to the adsorption and deposition of particles, colloidal particles or solute macromolecules in water on the surface of the membrane or in the pores of the membrane due to the physical and chemical interaction or mechanical interaction with the membrane during the membrane filtration process, resulting in the reduction of the membrane pore size or Clogging causes irreversible changes in permeation flow and separation characteristics of the membrane. [0003] There are many types of membrane fouling, and the adsorption of organic matter on the membrane surface is usually the main factor affecting membrane performance. During the membrane separation process, the adsorption of protein on the membrane surface usually occurs in the initial stage of membrane fouling. Once it occurs, i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D67/00B01D69/02
Inventor 冯霞谢曼曼汪子健陈莉赵义平
Owner TIANJIN POLYTECHNIC UNIV
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