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PVC hollow fiber porous film surface hydrophilic modification method

A polyvinyl chloride, hydrophilic modification technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problem of low water permeability of polyvinyl chloride hollow fiber porous membrane

Inactive Publication Date: 2006-11-22
北京坎普尔环保技术有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0006] The present invention solves the technical problem of low water permeability of the polyvinyl chloride hollow fiber porous membrane after film formation, and provides a polyvinyl chloride hollow fiber porous membrane After the membrane is formed, hydroxyl groups are chemically introduced to the surface of the membrane to prepare a porous membrane with high water permeability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0013] Example 1 With a commercially available or self-made polyvinyl chloride hollow fiber ultrafiltration membrane (after measurement, under the conditions of operating pressure 0.1Mpa and 25°C, its water permeation rate is 150l / m 2 h), soak in an aqueous solution containing potassium permanganate and potassium hydroxide (or sodium hydroxide) at a certain temperature to react for a certain period of time, take it out and wash it with water, and then soak the hollow fiber membrane in 0.1-2mol / l In a solution of sulfurous acid (obtained by adding sulfuric acid to sodium bisulfite), react at room temperature until the color of the brown hollow fiber membrane fades away to obtain a hydrophilic hollow fiber ultrafiltration membrane. The reaction conditions and test results are shown in Table 1.

[0014] Potassium permanganate concentration

[0015] Example 2 Soak the hollow fiber ultrafiltration membrane of Example 1 in an aqueous solution containing tetrabutylammonium ...

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Abstract

The invention discloses a surface hydrophilic modified method of polyvinylchloride hollow fibre porous film, which comprises the following steps: immersing polyvinylchloride hollow fibre porous film in the kalium hypermanganicum at 0.01-0.64 mol per l and strong alkali solution at 0.5-6 mol per l for 10-100 min at 30-75 deg.c; taking the porous film out of solution; washing the film through water; immersing the film in the sulfite at 0.1-2 mol per l until the brown film color fades; producing hollow fiber porous film with high penetration rate.

Description

Technical field: [0001] The invention relates to a surface hydrophilic modification method of a polyvinyl chloride hollow fiber porous membrane, wherein the porous membrane refers to an ultrafiltration membrane or a microfiltration membrane. Background technique: [0002] The amount of water permeable per unit membrane area under a certain pressure is called water permeability. Water permeability is an important index to measure the quality of ultrafiltration membrane and microfiltration membrane. This index is usually related to the filter pore size, porosity and hydrophilicity of the membrane. The filtration pore size and porosity of the membrane are already determined when the membrane is formed, so if the membrane is modified after it is formed, the effect of the membrane modification can be measured by comparing the water permeability. Generally, the higher the hydrophilicity of the membrane surface, the higher its water permeability and the higher its ability to resi...

Claims

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Application Information

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IPC IPC(8): C08J7/12B01D69/08C08L27/06
Inventor 孟广桢葛道才
Owner 北京坎普尔环保技术有限公司
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