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Method for hydrophilic modifying of poly-vinylidene fluoride film

A hydrophilic modification and hydrophilic technology, applied in the field of polymer film preparation, can solve the problems of poor graft modification effect, high chemical bond energy, low surface energy, etc., achieve good anti-pollution performance, improve hydrophilicity The effect of improving the property and hydrophilicity

Inactive Publication Date: 2006-11-08
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low surface energy of PVDF, it is extremely difficult to blend with other polymers, especially hydrophilic polymers
At the same time, the chemical bond energy of the polymer is very high, and the effect of graft modification by conventional irradiation methods is also very poor, and the expected goals cannot be achieved.

Method used

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  • Method for hydrophilic modifying of poly-vinylidene fluoride film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The photosensitive group-containing polymer used in this embodiment is polyethersulfone (PES). Mix PVDF, PES and N-methylpyrrolidone uniformly in a mass ratio of 14.5:0.5:85, then add LiCl of 3 / 10 of the total amount of the polymer, stir well, and prepare a casting solution. Mature at 60-70°C for 24 hours, and let stand for defoaming. The casting liquid is poured on the non-woven fabric, and the water is used as the coagulation bath, and the flat filter membrane is prepared by the phase inversion method. The film thickness is about 200 μm, and the rejection rate of 0.1% BSA solution is 76.4%. Surface graft polymerization was carried out in a tetrafluoroethylene circular reactor with a diameter of 5 cm. The membrane was installed face up in the reactor, and then the monomer solution was added to a height of about 5 mm on the surface of the membrane. The reactor is placed directly below the straight ultraviolet lamp source, and the power of the ultraviolet lamp is 500W...

Embodiment 2

[0030] The flat filter membrane prepared in Example 1 was used for graft modification under the same irradiation conditions.

[0031] The hydrophilic monomer used was N-vinyl-2-pyrrolidone (NVP), the concentration of the aqueous monomer solution was 3%, and the grafting time was 10 minutes. After the reaction, the film was dried in a vacuum oven. The contact angle of the modified membrane was measured to be 33°, the fouling coefficient m of the membrane was 0.280, the pure water flux recovery coefficient γ of the membrane was 96.5%, and the rejection rate of the modified membrane to 0.1% BSA solution was 78.5%.

Embodiment 3

[0033]The polymer with photosensitive groups used in this embodiment is phenolphthalein-based polyethersulfone (PES-C). Mix PVDF, PES-C and N-methylpyrrolidone uniformly in a mass ratio of 13.3:0.7:86, then add LiCl of 3 / 10 of the total amount of the polymer, stir well, and prepare a casting solution at 60- Mature at 70°C for 24 hours, and let stand for defoaming. The casting liquid is poured on the non-woven fabric, and the water is used as the coagulation bath, and the flat filter membrane is prepared by the phase inversion method. The film thickness is about 200 μm, and the rejection rate of 0.1% BSA solution is 72.4%. The irradiation method is the same as in Example 1. The height of adding the monomer solution is about 7mm. The power of the used straight ultraviolet lamp is 1000W. The distance between the reactor and the ultraviolet light source is 20 cm.

[0034] The hydrophilic monomer used in this example is 2-acrylamido-2-methyl-propanesulfonic acid (AMPS), the co...

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Abstract

The present invention belongs to the field of polymer film preparing technology, and is especially method of modifying hydrophilicity of polyvinylidene fluoride film. The method combines blending and surface grafting technology, and includes the first blending polyvinylidene fluoride and one other photosensitive polymer and preparing microporous or compact film, and the subsequent surface grafting hydrophilic monomer onto the surface of the blend film. The prepared modified film has excellent chemical stability and mechanical performance similar to that of microporous polyvinylidene fluoride film as well as improved surface hydrophilicity and antifouling performance.

Description

Technical field: [0001] The invention belongs to the technical field of polymer film preparation, and in particular relates to a method for hydrophilically modifying a polyvinylidene fluoride (PVDF) film. Background technique: [0002] Polyvinylidene fluoride (PVDF) is a fluorocarbon thermoplastic resin with excellent performance, which has very good weather resistance and chemical stability. The PVDF film will not crack if it is placed outdoors for one or twenty years; its performance will basically remain unchanged when it is irradiated with an ultraviolet lamp with a wavelength of 20-400nm for one year. PVDF can only be dissolved or partially dissolved in a few solvents such as fuming sulfuric acid, strong alkali and dimethylformamide (DMF), and is not corroded by acids, alkalis, strong oxidants and halogens at room temperature. The membrane has the above-mentioned advantages, and can be used to prepare thin films with excellent performance by the salivation method. In t...

Claims

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Application Information

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IPC IPC(8): C08J7/12C08J5/18C08L27/16
Inventor 平郑骅张明刚
Owner FUDAN UNIV
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