Sintered alpha-alumina/polyviny lidene fluoride blended hollow fiber membrane preparing method and its product

A technology of polyvinylidene fluoride and aluminum oxide, which is applied in chemical instruments and methods, membrane technology, semipermeable membrane separation, etc., can solve the problems of low strength, complicated process, high production cost, etc. The effect of simple process and low equipment requirements

Inactive Publication Date: 2005-02-16
ZHEJIANG OMEX ENVIRONMENTAL ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention mainly solves the technical problems in the existing hollow fiber membrane preparation method that the process is relatively complicated, the film-forming process is relatively high, the production cost is high, and the overall structure is unreasonable.
[0006] At the same time, the present invention also solves the technical problems of low hydrophilicity or low strength of the membrane produced by the existing hollow fiber membrane preparation method

Method used

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  • Sintered alpha-alumina/polyviny lidene fluoride blended hollow fiber membrane preparing method and its product
  • Sintered alpha-alumina/polyviny lidene fluoride blended hollow fiber membrane preparing method and its product
  • Sintered alpha-alumina/polyviny lidene fluoride blended hollow fiber membrane preparing method and its product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Step 1, 70g of sintered α-alumina with an average particle size of 0.4 μm is added to a flask containing 2787g of N-methyl-2-pyrrolidone (hereinafter abbreviated as NMP), placed in Sonicator.RTM. Disperse in the container for at least 1.5 hours to disperse the agglomerates, and the color is milky white at this time.

[0026] Step 2: Slowly add 525 g of polyvinylidene fluoride (hereinafter abbreviated as PVDF) with a molecular weight of about 100,000 Daltons to the milky white solution under vigorous stirring. During this addition, the color of the solution first changed from milky white to pink, then to tan, and finally to gray or brown.

[0027] Step 3, after the above-mentioned gray or brown mixed solution is stable (the color does not change in 4-24 hours), add 118g of NMP solution containing 30% polyvinyl alcohol and 1.6-1.7% sulfuric acid, and the degree of hydrolysis of polyvinyl alcohol is 50 % After stirring vigorously for 4-24 hours, let stand or centrifuge to...

Embodiment 2

[0030] The hollow fiber membrane was prepared by the same method and steps as in Example 1. The difference is that N,N'-dimethylacetamide (DMAC) is used as a good solvent, the sintered α-alumina added is 60g with an average particle size of 0.4μm, and the polyvinylidene fluoride (PVDF) used is a molecule 400g of approximately 400,000 Daltons, 100g of NMP solution containing 30% polyvinyl alcohol and 1.6-1.7% sulfuric acid was added to the stable mixture. The prepared hollow fiber membrane has a porosity of 50%, an average pore diameter of 0.02 μm, and a pure water flux of 400 L / m at room temperature and 34.45 kPa (5 psi). 2 h.

Embodiment 3

[0032] The hollow fiber membrane was prepared by the same method and steps as in Example 1. The difference is that the concentration of polyvinylidene fluoride (PVDF) accounts for 10% of the total weight of the membrane-forming liquid, and the molecular weight of PVDF is 1,000,000 Daltons. The concentration of sintered α-alumina is 30% of the total weight of the membrane-forming solution, and the average particle size is 5 μm. The concentration of the hydrophilic additive polyvinylpyrrolidone is 5% of the total weight of the membrane-forming solution. The prepared hollow fiber membrane has a porosity of 70%, an average pore diameter of 0.3 μm, and a pure water flux of 800 L / m at room temperature and 34.45 kPa (5 psi). 2 h.

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Abstract

The invention relates to an approach of producing asymmetry sintering alpha-alumina / polyvinylidene fluoride crossblend hollow fibre membrane. It also relates prescription of private membrane-forming liquor and its production. Use polyvinylidene fluoride as materials; disperse sinteringalpha-alumina in its good solvent to make them react to form mixing liquor; Add hydrophilicity compound which react with the mixing liquor to get membrane-forming liquor with some viscosity; using phase transmitting method to produce hollow fibre membrane. So the invention has merits of rational proportion, simple technics, low requirements to equipment and components complementation. It can manufacture bigger aperture, high permeation flux and asymmetry membranes.

Description

technical field [0001] The present invention relates to a method for preparing a hollow fiber membrane, in particular to a method for preparing a sintered α-alumina / polyvinylidene fluoride blended hollow fiber membrane with an asymmetric structure, the formula of a special membrane-making liquid and its products . The hollow fiber membrane is mainly used as an organic microfiltration and ultrafiltration membrane to filter liquids. Background technique [0002] The use of organic microfiltration or ultrafiltration membranes to filter liquids is a major method for the treatment of various water bodies today. Relevant researchers from all over the world continue to research in this technical field in order to obtain better membrane performance. For example, someone has applied for the title "hollow fiber polyvinylidene fluoride resin porous membrane" (98807444.3), which has a uniform three-dimensional network pore structure composed entirely of polyvinylidene fluoride resin. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/08B01D71/34
Inventor 吴扬寇瑞强
Owner ZHEJIANG OMEX ENVIRONMENTAL ENG CO LTD
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