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Preparation method for hydrophilic anti-fouling polyvinylidene fluoride membrane

A polyvinylidene fluoride film and a polyvinylidene fluoride technology are applied in the field of preparation of hydrophilic and anti-pollution polyvinylidene fluoride films, which can solve the problems of limitation, easy damage to the structure, harm to the human body, etc., and meet the requirements of low equipment. , good anti-pollution performance, easy to operate effect

Inactive Publication Date: 2015-04-29
FUZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the structure of polymers is easily damaged under long-term irradiation, and these ions are harmf

Method used

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  • Preparation method for hydrophilic anti-fouling polyvinylidene fluoride membrane
  • Preparation method for hydrophilic anti-fouling polyvinylidene fluoride membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1) Preparation of PVDF original membrane:

[0026] Take 4g of PVDF powder and 1g of polyvinylpyrrolidone dissolved in 34mL N,N-dimethylacetamide (DMAc) to prepare a 15wt% PVDF casting solution, stir evenly at 70°C, vacuum defoam, and then use a 300μm spatula to remove the casting solution Spread it on a glass plate and place it in a coagulation bath at 65°C (DMAc / distilled water = 30 / 70, w / w); wait until the PVDF membrane is separated from the glass plate, then take it out and soak it in secondary water for 48 hours , dried to obtain the original PVDF film;

[0027] 2) Chemical modification of PVDF membrane surface:

[0028] Put 4 pieces of original PVDF membranes (4cm×4cm) into a flask filled with 35mL of a mixed solution of methanol and water (45 / 55, w / w), and add 0.1g of sulfobetaine methacrylate (SBMA ) and 0.005g of pentamethyldiethylenetriamine; nitrogen gas was passed for 30 minutes to remove the air, then 0.001g of cuprous chloride was added therein, a...

Embodiment 2

[0031] 1) Preparation of PVDF original membrane:

[0032] Dissolve 6g of PVDF powder and 1g of polyvinylpyrrolidone in 34mL of N,N-dimethylacetamide (DMAc) to prepare a 20wt% PVDF casting solution, stir evenly at 75°C, vacuum defoam, and then use a 300μm Spread the spatula on the glass plate and place it in a coagulation bath at 65°C (DMAc / distilled water = 30 / 70, w / w); wait until the PVDF membrane is separated from the glass plate, take it out and soak it in secondary water for 48 Hours, dry to get PVDF original film.

[0033] 2) Chemical modification of PVDF membrane surface:

[0034] Put 4 pieces of PVDF original membranes (4 cm × 4 cm) into a flask filled with 35 mL of a mixed solution of methanol and water (45 / 55, w / w), and add 0.1 g sulfobetaine methacrylate ( SBMA) and 0.005g pentamethyldiethylenetriamine; Nitrogen was passed for 30 minutes to remove the air, then 0.005 g of cuprous chloride was added to it, heated to 40°C for 6 hours; the reacted film was treated wit...

Embodiment 3

[0037] 1) Preparation of PVDF original membrane:

[0038] Dissolve 4g of PVDF powder and 0.5g of polyvinylpyrrolidone in 34mL of N,N-dimethylacetamide (DMAc) to prepare a 15wt% PVDF casting solution, stir evenly at 75°C, vacuum defoam, and then use the casting solution with Spread a 300μm spatula on a glass plate and place it in a coagulation bath at 65°C (DMAc / distilled water = 30 / 70, w / w); wait until the PVDF membrane is separated from the glass plate, then take it out and soak it in secondary water After 48 hours, dry to obtain the original PVDF film.

[0039] 2) Chemical modification of PVDF membrane surface:

[0040] Put 4 pieces of PVDF original membranes (4cm×4cm) into a flask filled with 35mL of a mixed solution of methanol and water (45 / 55, w / w), and add 0.2g of sulfobetaine methacrylate (SBMA) and 0.01 g of pentamethyldiethylenetriamine. Nitrogen was blown for 30 minutes to remove the air, then 0.002 g of cuprous chloride was added thereto, and heated to 4...

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Abstract

The invention discloses a preparation method for a hydrophilic anti-fouling polyvinylidene fluoride membrane, and belongs to the field of polymer modification. The preparation method comprises the following steps: preparing an original polyvinylidene fluoride membrane at first, and then grafting a hydrophilic anti-fouling monomer to the surface of the original polyvinylidene fluoride membrane to obtain the hydrophilic anti-fouling polyvinylidene fluoride membrane by taking a fluorine atom on the surface of the original polyvinylidene fluoride membrane as an initiation point by virtue of an atom transfer radical polymerization method. The preparation method is simple and easy to operate and industrially implement, and has low requirements on equipment; the prepared hydrophilic anti-fouling polyvinylidene fluoride membrane has high hydrophilicity and anti-fouling performance, and the main chain structure of polyvinylidene fluoride is kept undamaged, so that the prepared hydrophilic anti-fouling polyvinylidene fluoride membrane has high physical performance the same as that of the original polyvinylidene fluoride membrane.

Description

technical field [0001] The invention belongs to the field of polymer modification, and in particular relates to a preparation method of a hydrophilic anti-pollution polyvinylidene fluoride membrane. Background technique [0002] Polyvinylidene fluoride (PVDF) is a commonly used film-forming material for synthetic polymer films, which has good mechanical properties, thermal stability, solvent resistance, and microbial corrosion resistance. However, due to its low surface energy and strong hydrophobic nature, its anti-fouling and biocompatibility are poor, and the polymer porous membrane prepared by it is easy to cause non-specific protein adsorption in practical applications, which limits its application in many fields. Applications in many fields. [0003] There are many ways to modify PVDF membranes, and surface chemical modification is one of the most important methods. At present, surface chemical modification is mainly through plasma, ozone pretreatment, introduction o...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D67/00
Inventor 李建华张德彬王双双闫邦锋李弥滋张其清
Owner FUZHOU UNIVERSITY
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