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Method for preparing polyvinylidene fluoride/aluminum oxide hybridization film

A polyvinylidene fluoride, alumina technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of high particle size requirements of inorganic particles, decreased separation performance, uneven membrane structure, etc. Achieve the effect of improving phase separation, avoiding flocculation, and improving hydrophilicity and strength

Active Publication Date: 2010-04-28
SOUTH CHINA UNIV OF TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its strong hydrophobicity will lead to two problems: one is that the separation process requires a strong driving force; the other is that it is easy to generate adsorption pollution, resulting in a decrease in separation performance and a shortened service life of the membrane, which restricts its application in biochemical pharmaceuticals, food and beverage and water. Application of water phase separation system such as purification
However, the above modification methods are all adding inorganic nanoparticles directly into the casting solution. Since the inorganic particles are simply dispersed in the PVDF network, only a relatively weak physical interaction between them can improve the PVDF membrane. In addition, these methods have high requirements on the particle size of inorganic particles, and it takes a long time to disperse inorganic particles, easy to agglomerate, and form an uneven membrane structure

Method used

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  • Method for preparing polyvinylidene fluoride/aluminum oxide hybridization film
  • Method for preparing polyvinylidene fluoride/aluminum oxide hybridization film
  • Method for preparing polyvinylidene fluoride/aluminum oxide hybridization film

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Add 20 grams of polyvinylidene fluoride into 92.43 grams of N,N-dimethylacetamide solvent, stir and dissolve at 70°C, add 0.2 grams of aluminum isopropoxide and 0.2 grams of vinyltrimethoxysilane, and stir for 1 hour Add 0.09g of deionized water, hydrolyze at 90°C for 1h, then cool down to 55°C, add 0.01g of HNO 3 Catalytic peptization and 4.7 g of polyvinylpyrrolidone were used as a pore-forming agent, and stirring was continued for 20 hours at 90° C. to obtain 117.63 g of a uniform casting solution. The above solution was allowed to stand at room temperature for 24 hours to defoam.

[0026] Scrape the flat film from the casting solution after defoaming at room temperature, place it in the air for 30 seconds, and then completely immerse it in the coagulation bath, which is deionized water. The formed ultrafiltration membrane is soaked in deionized water for 7 days. Allow to air dry.

Embodiment 2

[0028] Add 20 grams of polyvinylidene fluoride into 91.5 grams of N,N-dimethylacetamide solvent, stir and dissolve at 70°C, add 0.8 grams of aluminum isopropoxide and 0.2 grams of vinyltrimethoxysilane, and stir for 1 hour Add 0.36 g of water, hydrolyze at 90°C for 1 hour, then cool down to 55°C, add 0.04 g of HNO 3 Catalyzed peptization and 4.7 g of polyvinylpyrrolidone were used as a pore-forming agent, and 117.60 g of uniform casting solution was obtained by continuing to stir at 90° C. for 24 hours. The above solution was allowed to stand at room temperature for 24 hours to defoam.

[0029] Scrape the flat film from the defoamed casting solution at room temperature, place it in the air for 30 seconds, then immerse it in the coagulation bath, the coagulation bath is water, and soak the formed ultrafiltration membrane in deionized water for 7 days, take out Allow to air dry.

Embodiment 3

[0031] Add 20 grams of polyvinylidene fluoride into 89.02 grams of N,N-dimethylacetamide solvent, stir and dissolve at 70°C, add 2.4 grams of aluminum isopropoxide and 0.2 grams of vinyltrimethoxysilane, and stir for 1 hour Add 1.08g of water, hydrolyze at 90°C for 1h, then cool down to 55°C, add 0.12g of HNO 3 Catalyzed peptization and 4.7 g of polyvinylpyrrolidone were used as a pore-forming agent, and stirring was continued at 90° C. for 24 hours to obtain 117.52 g of a uniform casting solution. The above solution was allowed to stand at room temperature for 24 hours to defoam.

[0032] Scrape the flat film from the degassed casting solution at room temperature, place it in the air for 30 seconds, then completely immerse it in deionized water, soak the formed ultrafiltration membrane in deionized water for 7 days, take it out and dry it in the air.

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Abstract

The invention discloses a method for preparing polyvinylidene fluoride / aluminum oxide hybridization film, comprising taking polyvinylidene fluoride to be dissolved into solvent; after fully dissolving the polyvinylidene fluoride, adding aluminium isopropoxide and coupling agent into the solution in a stirring state; adding water for hydrolyzation, adding acid for catalysis, and then adding pore-forming agent; stirring for at least 20h to obtain even casting film liquid, and standing still at the room temperature; scraping the casting film liquid into a panel film at the room temperature, placing the panel film in the air, soaking in coagulating bath, and forming a hyperfiltration film; and soaking the hyperfiltration film in the water, and taking out to be dried. The method uses strong chelating ligand and high activity aggregation group to respectively carry out chemical modification on PVDF organic macromolecule and Al2O3 inorganic precursor, so that the hybridization film prepared by a sol-gel method maintains the excellent chemical stability and mechanical performance of a PVD film; furthermore, the hydrophilicity and the film contamination resistance of the hybridization film are added, so that the separation property and the stability of the film can be remarkably improved.

Description

technical field [0001] The invention relates to the technical field of membrane material preparation and modification, in particular to a preparation method of a polyvinylidene fluoride / alumina hybrid membrane. Background technique [0002] Polyvinylidene fluoride (PVDF) is a semi-crystalline polymer. Because the -C-F- bond in its molecule has high bond energy, it is heat-resistant, corrosion-resistant, radiation-resistant, and has high strength and good toughness, so it is the preferred material for preparing membranes. However, its strong hydrophobicity will lead to two problems: one is that the separation process requires a strong driving force; the other is that it is easy to generate adsorption pollution, resulting in a decrease in separation performance and a shortened service life of the membrane, which restricts its application in biochemical pharmaceuticals, food and beverage and water. Application of water phase separation system such as purification. Therefore, ...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D69/12B01D69/06
Inventor 肖凯军李香莉郭祀远王兆梅易立中
Owner SOUTH CHINA UNIV OF TECH
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