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Preparation method of super-hydrophilic polyvinylidene fluoride/polydopamine composite films

A polyvinylidene fluoride, composite film technology, applied in spinning solution preparation, filament/thread forming, non-woven fabric and other directions, can solve the problems of short service life, membrane fouling membrane flux, poor wettability, etc. Achieving good oil-water separation effect and adsorption performance

Active Publication Date: 2017-05-31
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, polyvinylidene fluoride film is non-polar, has low surface energy, poor wettability, and strong hydrophobicity, which severely limits its application in aqueous phase separation systems: on the one hand, strong hydrophobicity To make water pass through the membrane to overcome the high resistance, the operating pressure must be increased to force the water to pass through the membrane, so the energy consumption is high; on the other hand, the strong hydrophobicity makes pollutants (such as oil-water separation, protein Organic substances and proteins during drug separation are easily adsorbed on the membrane surface and membrane pores through electrostatic interactions, hydrogen bonds, van der Waals forces, etc., resulting in membrane fouling, resulting in attenuation of membrane flux, decrease in retention rate, and short service life

Method used

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  • Preparation method of super-hydrophilic polyvinylidene fluoride/polydopamine composite films

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A kind of preparation method of superhydrophilic polyvinylidene fluoride / polydopamine composite film, its step is:

[0022] A. Preparation of polyvinylidene fluoride / dopamine solution:

[0023] Dimethylacetamide and acetone are prepared into a mixed solvent at a volume ratio of 1:1, then polyvinylidene fluoride is added to the mixed solvent, and the temperature is raised to 45°C under stirring conditions, and the stirring is continued for 5 hours to obtain polyvinylidene fluoride The dimethylacetamide-acetone solution of vinylidene fluoride, the mass percent of polyvinylidene fluoride in the solution is 20%; Then add dopamine monomer in the dimethylacetamide-acetone solution of aforementioned polyvinylidene fluoride, Stir continuously for 1.5h, and then perform ultrasonic treatment for 1h, and the ultrasonic treatment intensity is 5×10 4 W / m 3 . The mass ratio of polyvinylidene fluoride to dopamine monomer is 100:50;

[0024] B. Preparation of polyvinylidene fluorid...

Embodiment 2

[0030] A. Preparation of polyvinylidene fluoride / dopamine solution:

[0031] Dimethylacetamide and acetone are prepared into a mixed solvent at a volume ratio of 1:1, then polyvinylidene fluoride is added to the mixed solvent, and the temperature is raised to 40°C while stirring, and the stirring is continued for 4 hours to obtain polyvinylidene fluoride The dimethylacetamide-acetone solution of vinylidene fluoride, the mass percent of polyvinylidene fluoride in the solution is 18%; Then add dopamine monomer in the dimethylacetamide-acetone solution of aforementioned polyvinylidene fluoride, Stir continuously for 1h, and then perform ultrasonic treatment for 0.5h, and the intensity of ultrasonic treatment is 2.5×10 4 W / m 3 . The mass ratio of polyvinylidene fluoride to dopamine monomer is 100:20;

[0032] B. Preparation of polyvinylidene fluoride / polydopamine composite film:

[0033] The polyvinylidene fluoride / dopamine solution was electrospun, the spinning speed was 0.01...

Embodiment 3

[0036] A. Preparation of polyvinylidene fluoride / dopamine solution:

[0037] Dimethylacetamide and acetone are prepared into a mixed solvent at a volume ratio of 1:1, then polyvinylidene fluoride is added to the mixed solvent, and the temperature is raised to 50°C under stirring conditions, and the stirring is continued for 6 hours to obtain polyvinylidene fluoride The dimethylacetamide-acetone solution of vinylidene fluoride, the mass percent of polyvinylidene fluoride in the solution is 25%; Then add dopamine monomer in the dimethylacetamide-acetone solution of aforementioned polyvinylidene fluoride, Stir continuously for 2 hours, and then perform ultrasonic treatment for 1 hour, and the intensity of ultrasonic treatment is 5×10 4 W / m 3 . The mass ratio of polyvinylidene fluoride to dopamine monomer is 100:80;

[0038] B. Preparation of polyvinylidene fluoride / polydopamine composite film:

[0039]The polyvinylidene fluoride / dopamine solution was electrospun, the spinning...

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Abstract

The invention discloses a preparation method of super-hydrophilic polyvinylidene fluoride / polydopamine composite films. The preparation method includes the steps: dissolving the polyvinylidene fluoride in mixed solvents of dimethylacetamide and acetone, adding dopamine monomers, and performing electrostatic spinning for polyvinylidene fluoride / dopamine solution to obtain polyvinylidene fluoride / dopamine composite films; performing reaction for the polyvinylidene fluoride / dopamine composite films in a baking oven for 6-30 hours, and taking out to obtain the polyvinylidene fluoride / polydopamine composite films. The polyvinylidene fluoride / polydopamine composite films prepared by the method have high hydrophilic performance and good oil-water separation and adsorption performance.

Description

technical field [0001] The invention belongs to the field of engineering materials, and more specifically, the invention relates to a preparation method of a polyvinylidene fluoride composite film. Background technique [0002] Polyvinylidene fluoride is a semi-crystalline polymer obtained by polymerization of monomer 1,1-difluoroethylene. It has excellent mechanical properties, heat resistance, chemical corrosion resistance and weather resistance. It is hydrophobic and easy to Soluble in organic solvents. In addition, polyvinylidene fluoride has good film-forming properties, and the obtained polyvinylidene fluoride film has the advantages of high mechanical strength, good toughness, heat resistance, creep resistance, wear resistance, impact resistance, and oxidation resistance. , can prepare asymmetric microfiltration membranes, ultrafiltration membranes, nanofiltration membranes, reverse osmosis membranes, etc., which are widely used in drinking water purification, biopha...

Claims

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Application Information

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IPC IPC(8): D04H1/728D01D5/00D01D1/02D06M13/328D06M101/22
CPCD01D1/02D01D5/0015D04H1/728D06M13/328D06M2101/22
Inventor 王勇马芳芳黄婷杨静晖张楠
Owner SOUTHWEST JIAOTONG UNIV
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