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Preparation method of modified polyvinylidene fluoride-polyvinyl alcohol binary composite ultrafiltration membrane

A polyvinylidene fluoride and binary composite technology, applied in the field of materials science, can solve the problems of poor hydrophilicity and poor anti-pollution performance, achieve strong anti-pollution performance, easy to obtain, improve pure water flux and flux recovery rate effect

Inactive Publication Date: 2016-02-17
SHANGHAI APPLIED TECHNOLOGIES COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above technical problems in the prior art, the present invention provides a method for preparing a modified polyvinylidene fluoride-polyvinyl alcohol binary composite ultrafiltration membrane, the modified polyvinylidene fluoride-polyvinyl alcohol The preparation method of polyvinyl alcohol binary composite ultrafiltration membrane solves the technical problem of poor hydrophilicity of unmodified polyvinylidene fluoride membrane in the prior art, which leads to poor anti-pollution performance of the membrane

Method used

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  • Preparation method of modified polyvinylidene fluoride-polyvinyl alcohol binary composite ultrafiltration membrane
  • Preparation method of modified polyvinylidene fluoride-polyvinyl alcohol binary composite ultrafiltration membrane
  • Preparation method of modified polyvinylidene fluoride-polyvinyl alcohol binary composite ultrafiltration membrane

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Effect test

Embodiment 1

[0018] Add 0.03wt.% carboxylated multi-walled carbon nanotubes to 82wt.% dimethyl sulfoxide solvent, ultrasonically disperse for 10 minutes; then add a total of 18wt.% polyvinylidene fluoride and polyvinyl alcohol powder to form a binary film Materials, control the temperature at 95°C, and mechanically stir for 12 hours to dissolve to obtain the casting solution;

[0019] Then, after fully defoaming the obtained casting solution at 50°C, scrape the film on the glass plate;

[0020] Then immerse the glass plate with a thin layer of casting solution into a gel bath at 25°C to form a phase-separated film, then soak it in deionized water for 7 days, take it out, and dry it naturally in the air to obtain the modified carboxylated multi-walled carbon nanotubes. The polyvinylidene fluoride-polyvinyl alcohol binary composite ultrafiltration membrane;

[0021] In the binary membrane material composed of polyvinylidene fluoride and polyvinyl alcohol, polyvinylidene fluoride and polyvin...

Embodiment 2

[0025] Add 0.06wt.% carboxylated multi-walled carbon nanotubes to 82wt.% dimethyl sulfoxide solvent, ultrasonically disperse for 10 minutes; then add a total of 18wt.% polyvinylidene fluoride and polyvinyl alcohol powder to form a binary film Materials, control the temperature at 105°C, and mechanically stir for 12 hours to dissolve to obtain the casting solution;

[0026] Then, after fully defoaming the obtained casting solution at 60°C, scrape the film on the glass plate;

[0027] Then immerse the glass plate with a thin layer of casting solution into a gel bath at 30°C to form a phase-separated film, then soak it in deionized water for 5 days, take it out, and dry it naturally in the air to obtain the modification of carboxylated multi-walled carbon nanotubes The polyvinylidene fluoride-polyvinyl alcohol binary composite ultrafiltration membrane;

[0028] In the binary membrane material composed of polyvinylidene fluoride and polyvinyl alcohol, polyvinylidene fluoride and ...

Embodiment 3

[0032] Add 0.09wt.% carboxylated multi-walled carbon nanotubes to 82wt.% dimethyl sulfoxide solvent, ultrasonically disperse for 10 minutes; then add a total of 18wt.% polyvinylidene fluoride and polyvinyl alcohol powder to form a binary film Materials, control the temperature at 100°C, and mechanically stir for 12 hours to dissolve to obtain the casting solution;

[0033] Then, after fully defoaming the obtained casting solution at 60°C, scrape the film on the glass plate;

[0034] Then immerse the glass plate with a thin layer of casting solution into a gel bath at 30°C to form a phase-separated film, then soak it in deionized water for 5 days, take it out, and dry it naturally in the air to obtain the modification of carboxylated multi-walled carbon nanotubes The polyvinylidene fluoride-polyvinyl alcohol binary composite ultrafiltration membrane;

[0035] In the binary membrane material composed of polyvinylidene fluoride and polyvinyl alcohol, polyvinylidene fluoride and ...

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Abstract

The invention relates to a preparation method of a modified polyvinylidene fluoride-polyvinyl alcohol binary composite ultrafiltration membrane. The preparation method comprises the following steps of preparing membrane casting solution, wherein the membrane casting solution is prepared by polyvinylidene fluoride powder, polyvinyl alcohol powder, carboxylation multiwalled carbon nanotubes and dimethyl sulfoxide solvent; fully dispersing the carboxylation multiwalled carbon nanotube in the dimethyl sulfoxide solvent, then sequentially adding binary membrane materials prepared by the polyvinylidene fluoride powder and the polyvinyl alcohol powder, controlling the temperature to be 95 to 105 DEG C, mechanically stirring and dissolving, and obtaining uniform membrane casting solution; then after fully defoaming the obtained membrane casting solution at the temperature of 40 to 60 DEG C, scraping the membrane on a glass plate; immersing the glass plate with a membrane casting solution thin layer into coagulation bath with the temperature of 25 to 35 DEG C to split phases to form the membrane, taking out after soaking in deionized water for 5 to 7 days, naturally drying, and storing. According to the binary composite ultrafiltration membrane provided by the invention, the flux recovery rate can achieve 81.2 percent, and the binary composite ultrafiltration membrane has good hydrophilic and antifouling property.

Description

technical field [0001] The invention belongs to the field of material science and relates to a membrane, in particular to a preparation method of a modified polyvinylidene fluoride-polyvinyl alcohol binary composite ultrafiltration membrane. Background technique [0002] At present, the preparation process of polymer membrane materials has been unprecedentedly developed, for example, polyethersulfone (PES), polysulfone (PSF), polymethyl methacrylate (PMMA), polyacrylonitrile (PAN) and polylactic acid ( PLA) etc. Polyvinylidene fluoride (PVDF) has been widely used due to its acid resistance, alkali resistance, corrosion resistance and excellent mechanical properties. Therefore, different physical and chemical modification methods can be used to improve the hydrophilicity of the polyvinylidene fluoride membrane, thereby improving the anti-fouling ability of the membrane. Polyvinyl alcohol (PVA) is well known, its non-toxic, harmless and degradable, making it almost non-pollu...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D69/12B01D67/00
Inventor 陈桂娥徐孙杰许振良朱维纬吴琼孙威广沈倩
Owner SHANGHAI APPLIED TECHNOLOGIES COLLEGE
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