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Formula of preparation liquid for hollow-fibre membrane and products thereof

A fiber membrane and membrane-making liquid technology, which is applied in membrane technology, semi-permeable membrane separation, chemical instruments and methods, etc., can solve the problems of low water flux of hollow fiber membranes, reduced membrane water flux, and insufficient hydrophilicity. , to achieve the effect of simple film forming process, reasonable proportion and long service life

Inactive Publication Date: 2005-03-16
ZHEJIANG OMEX ENVIRONMENTAL ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention mainly solves the technical problems of low hydrophilicity and low strength of polyvinylidene fluoride membranes by adjusting the formula of polyvinylidene fluoride blended film-making liquid
[0007] The invention also solves the technical problem that the water flux of the polyvinylidene fluoride hollow fiber membrane is small, and the membrane water flux decreases due to the decrease of hydrophilicity during use, and improves the stability and use of the membrane. life

Method used

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  • Formula of preparation liquid for hollow-fibre membrane and products thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Take column 1 in Table 1 as an example to illustrate its specific implementation.

[0020] Step 1, after taking 60 parts of PVDF solid powder and 40 parts of solid SPES particles in the container and vigorously mechanically stirring them evenly, gradually add 313 parts of N, N'-dimethylacetamide (DMAc) to the feed liquid tank, adding while adding Stir to dissolve evenly. After stirring for 4 hours, 10 parts of PVP in DMAc solution was added to the mixture, and the stirring was continued until it was uniformly dissolved, which allowed the grafting of the hydrophilic additive into the blend through a chemical reaction.

[0021] Step 2, when the above mixed solution is stable, let stand or centrifuge to remove air bubbles. After defoaming, it is extruded into the annular space of the spinneret by a metering pump under a pressure of about 4 atmospheres. At the same time, the internal coagulation solidification bath quantitatively enters the insertion tube of the spinneret...

Embodiment 2

[0023] The hollow fiber membrane was prepared according to the same method and steps as in Example 1, except that the blend was PES. Taking column 2 in the table as an example, take 65 parts of PVDF solid powder and 35 parts of solid PES particles and stir vigorously in the container, and then gradually add 390 parts of solvent N,N'-dimethylformamide to the feed liquid tank , Stir while adding to make it dissolve evenly. After stirring for 4 hours, add N,N'-dimethylformamide solution containing 30 parts of PVP to the mixed solution, and continue to stir until it is uniformly dissolved. The outer diameter of the prepared hollow fiber membrane is 1.0mm, the inner diameter is 0.5mm, the porosity is 70%, the average pore diameter is 0.08μm, and the pure water flux is 530L / m at room temperature and 150kPa 2 h.

Embodiment 3

[0025]The hollow fiber membrane was prepared according to the same method and steps as in Example 1, except that the blend was PES. Take the third column in the table as an example, take 85 parts of PVDF solid powder and 15 parts of solid sulfonated PES particles in the container and stir them vigorously mechanically, then gradually add to the feed liquid tank containing 350 parts of solvent N-methyl-2-pyrrolidone , Stir while adding to make it dissolve evenly. After stirring for 4 hours, 15 parts of PVP was added to the mixture, and the stirring was continued until the mixture was uniformly dissolved. The outer diameter of the prepared hollow fiber membrane is 1.2mm, the inner diameter is 0.6mm, the porosity is 40%, the average pore diameter is 0.08μm, and the pure water flux is 400L / m at room temperature and 150kPa 2 h.

[0026] The ingredients of Embodiment 4 to Embodiment 7 are shown in Table 1 below, and the specific production process and other contents refer to the kn...

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Abstract

The invention relates to a kind of hollow fiber membrane, especially a hollow fiber membrane formula with mixing hydrophilic poly-biasfluorine ethylene and its products. Raw material of this membrane is the mixture of poly-biasfluorine ethylene and sulfonated poly-ethersulphone or the mixture of bias fluorine polyethylene and poly-ethersulphone. Then the mixture reacts with hydrophilic additive that is polyethylene pyrrolidone or polyvinyl alcohol, then forms the hydrophilic hollow fiber membrane by the way of chemical grafting. Poly-biasfluorine ethylene has nice flexibility and poly-ethersulphone or sulfonated poly-ethersulphone has high intensity, so mixing them can make advantages for them of their abilities. In the result, it can make the resulting hollow fiber membrane have the high water flux and the temperate intensity, can improve hydrophilicity and stability of it, and can make it have longer service life. This membrane can be used extensively in the fields such as Medicine, Sanitation, Foodstuff, Industry and so on.

Description

technical field [0001] The invention relates to a formula of a hollow fiber membrane membrane-making solution and its products, in particular to a formula of a hydrophilic polyvinylidene fluoride blended hollow fiber membrane and its products. The hollow fiber membranes are mainly used as microfiltration and ultrafiltration membranes to filter liquids. Background technique [0002] Polymer separation membrane technology has the advantages of simple operation, less energy consumption, small footprint, no secondary pollution, etc., and has great applications in water treatment. In recent years, there have been more and more researches in this technical field, such as the disclosed "hollow fiber polyvinylidene fluoride resin porous membrane" (patent number: 98807444.3), which has a uniform polyvinylidene fluoride resin. Three-dimensional mesh structure. [0003] The materials currently used to prepare selectively permeable membranes include cellulose, cellulose acetate, polya...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/08B01D71/68
Inventor 吴扬寇瑞强
Owner ZHEJIANG OMEX ENVIRONMENTAL ENG CO LTD
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