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Preparation of hydrophilic polyvinylidene fluoride microporous membrane

A technology of hydrophilic membrane and microporous membrane, applied in the field of preparation of hydrophilic polyvinylidene fluoride microporous membrane, can solve the problems of strong hydrophobicity, influence of membrane mechanical properties, high driving pressure, etc.

Inactive Publication Date: 2005-12-07
杨虎
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] PVDF polymer has the advantages of heat resistance, chemical corrosion resistance, and not easy to degrade. However, when its microporous membrane is used to treat water-based fluids, its strong hydrophobicity will cause two problems: one is to allow water to pass through the membrane pores. have high driving pressure
Blending modification is easy to affect the mechanical properties of the membrane

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0025] Example 1: Preparation of Flat Film

[0026] Use acetone, diethylene glycol, water (volume ratio is 91: 7: 2) as PVDF solvent, be made into 10% solution, the composition of modification liquid is the aqueous solution of polyvinyl alcohol (concentration 6%), wherein Contains 1% (relative to polyvinyl alcohol) glutaraldehyde, 1% sulfuric acid. When preparing a flat film, use a scraper to scrape the PVDF solution on a support such as a non-woven fabric or a glass plate to form a thin film of the solution with a scraper at 50-60 degrees, and then leave the support in the air for 5 seconds. The solution film is immersed in the modification solution together. Take it out after half an hour, wash it in water, remove the polyvinyl alcohol on the surface, and then dry it in an oven at 80 degrees for 2 hours. That's it. The measured water flux is 5.6kg / min.m under 0.2 atmospheric pressure 2 .

example 2

[0027] Example 2: Preparation of Flat Film

[0028] Use acetone, ethanol, water (volume ratio is 88: 10: 2) as PVDF solvent, be made into 18% solution, the composition of modification liquid is the aqueous solution of chitosan (concentration 3%), wherein contains 5% (relatively in chitosan) glutaraldehyde, 1% sulfuric acid. When preparing a flat film, use a scraper to scrape the PVDF solution on a support such as a non-woven fabric or a glass plate to form a thin film of the solution with a scraper at 50-60 degrees, and then leave the support in the air for 5 seconds. The solution film is immersed in the modification solution together. Take it out after half an hour, wash it in water, remove the polyvinyl alcohol on the surface, and then dry it in an oven at 80 degrees for 2 hours. That's it. The measured water flux is 2.5kg / min.m under 0.2 atmospheric pressure 2 .

example 3

[0029] Example 3: Preparation of Hollow Fiber Membrane

[0030] Acetone, glycerol, polyethylene glycol 200 (volume ratio is 86: 10: 4) is PVDF solvent, is made into 12% solution after high-temperature dissolving, and the composition of modification liquid is the aqueous solution of chitosan (concentration 5% ), containing 5% (relative to chitosan) glutaraldehyde, 1-8% sulfuric acid. The film-making solution composed of polymer, solvent and additive is filtered and pumped into the spinneret, and extruded in the form of a tubular liquid film around the linear core liquid supplied from the center of the spinneret, and passed through the "air The "gap" is pulled and stretched to a certain radial size, then immersed in an aqueous solution of chitosan to solidify into a hollow fiber, washed, and then dried in an oven at 80 degrees for 2 hours. The measured water flux is 4.5kg / min.m under 0.2 atmospheric pressure 2 .

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Abstract

The invention relates to a method for preparing hydrophilic PVDF microporous barrier. The principal raw material is polyvinylidene fluoride with the range of molecular weight: 5000 to 50000. It prepares hydrophilic PVDF microporous barrier by the method of separating solution and compounding dip-coating modification. It especially suits the occasion of effluent treatment, medicine separation and biochemy. The technology can prepare microporous barriers with plate type and hollow fiber type.

Description

technical field [0001] A pollution-resistant hydrophilic polyvinylidene fluoride microporous membrane is prepared, which can be used in biological separation, wastewater treatment and other occasions. The morphology of the membrane includes the structure of mesoporous fiber type and flat membrane type. Background technique [0002] As a new type of fluorocarbon thermoplastic, polyvinylidene fluoride (PVDF) has excellent weather resistance and chemical stability. Its performance is basically unchanged when it is irradiated with an ultraviolet lamp with a wavelength of 20-400nm for one year. It will not be brittle and cracked for ten or twenty years outdoors, and it will not be corroded by strong oxidants such as acids and alkalis and halogens at room temperature. Only a few chemicals such as oleum, strong alkalis and dimethylacetamide can swell or partially dissolve. PVDF has poor thermal conductivity and high melt viscosity. After immersing the prepared PVDF microporous m...

Claims

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Application Information

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IPC IPC(8): B01D71/34
Inventor 杨虎
Owner 杨虎
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