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Modification film of polyvinylidene fluoride and preparation method thereof

A polyvinylidene fluoride and modified technology, applied in the field of polyvinylidene fluoride membrane and its preparation, can solve the problems of easily polluted water flux and the like

Inactive Publication Date: 2005-10-26
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention is aimed at the problem that the existing polyvinylidene fluoride membrane is easily polluted during the filtration process and the water flux is greatly reduced after use, thereby providing a polyvinylidene fluoride that can be used for a long time, is not easy to pollute, and is not easy to affect the performance of the membrane. Modified film and its preparation method, it is made by dissolving polymer material accounting for 14-20 (wt)% of the total mass in an organic good solvent, and adding organic additives accounting for 1-6 (wt)% of the total mass, 0.01 ~4(wt)% inorganic additives and 0.01~0.9(wt)% titanium dioxide with an average particle size of 1~20nm

Method used

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specific Embodiment approach 1

[0004] Specific implementation method one: In this embodiment, polymer materials accounting for 14-20 (wt)% of the total mass are dissolved in an organic good solvent, and 1-6 (wt)% of the total mass of organic additives, 0.01- 4(wt)% inorganic additives and 0.01-0.9(wt)% titanium dioxide with an average particle size of 1-20nm, the total mass refers to polymer materials, organic good solvents, organic additives, inorganic additives and Common mass of titanium dioxide. The polymer material is fluorine-containing resin, polysulfone, polyethersulfone, polypropylene or polyacrylonitrile. The fluorine-containing resin is polyvinylidene fluoride or polytetrafluoroethylene. The good organic solvent is N,N-dimethylformamide, N,N-dimethylacetamide, N-methylpyrrolidone or acetone. The organic additives are polyvinylpyrrolidone and polyethylene glycols with relative molecular masses of 400-4000 respectively. The inorganic additive is anhydrous lithium chloride, ammonium chloride, sod...

specific Embodiment approach 2

[0007] Specific embodiment two: In this embodiment, 16 (wt)% of polyvinylidene fluoride is dissolved in N, N-dimethylformamide, and 5 (wt)% of polyethylene with a relative molecular mass of 400-4000 is added. It is prepared from diol, 0.3 (wt)% anhydrous lithium chloride and 0.3 (wt)% titanium dioxide with an average particle diameter of 10nm.

[0008] Its preparation process is: dissolving polyvinylidene fluoride accounting for 16 (wt)% of the total mass in N,N-dimethylformamide, and adding 5.0 (wt)% polyethylene oxide with a relative molecular mass of 400-4000 Diol, 0.3(wt)% anhydrous lithium chloride and 0.3(wt)% titanium dioxide with an average particle size of 10nm, at a temperature of 16°C and a humidity of 37%, cast a film solution at 22°C on a nonwoven A liquid film with a thickness of 0.5 mm was scraped on the cloth, and phase inversion was carried out in a coagulation bath at 16° C. to obtain a polyvinylidene fluoride film mixed with nano-titanium dioxide. The total...

specific Embodiment approach 3

[0009] Specific embodiment three: the difference between this embodiment and specific embodiment two is that polyvinylidene fluoride is dissolved in N-methylpyrrolidone, and 5 (wt) % of polyethylene glycol with a molecular weight of 1000, 0.3 (wt) )% sodium chloride to make a separation membrane, and then the separation membrane is immersed in the sol containing nano-titanium dioxide, or the sol containing nano-titanium dioxide is coated on the separation membrane.

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Abstract

The present invention relates to a polyvinylidene flouride modified film and its prparation method. Said invention is prepared by using (by wt%) 14-20% of high-molecular material dissolved in organic solvent and adding 1-6% of organic additive, 0.01-4% of inorganic additive and 0.01-0.9% of titanuim dioxide, whose average grain size is 1-20 nm. Said invention improves the hydrophilic property of polyvinylidene flouride, and the pure water flux of said polyvinylidene flouride film can be raised.

Description

Technical field: [0001] The invention relates to a polyvinylidene fluoride film and a preparation method thereof. Background technique: [0002] Ultrafiltration membranes and microfiltration membranes are commonly used in the separation process of water treatment and separation, purification and recovery of useful substances. Although there are many forms of membrane modules, the phase inversion method is mostly used for membrane production. That is to say, solid phase materials, additives or porogens are dissolved and dispersed in organic solvents to form a casting solution. The casting solution undergoes phase inversion through a coagulation bath to obtain a solid film. Polyvinylidene fluoride separation membrane is a kind of polymer membrane material commonly used in water or waste water and separation, purification and recovery. Polyvinylidene fluoride membranes can be divided into ultrafiltration membranes and microfiltration membranes according to the difference in ...

Claims

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Application Information

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IPC IPC(8): C08L27/16
Inventor 马军曹晓春
Owner HARBIN INST OF TECH
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