Modified polyvinyl chloride alloy ultra-filtration membrane and preparation method of hollow fiber ultra-filtration membrane

A technology of polyvinyl chloride and ultrafiltration membrane, which is applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc. It can solve the problems of unfavorable membrane strength and hydrophilicity, and achieve the improvement of hydrophilicity and surface Smoothness, easy preparation, and low-cost effects

Inactive Publication Date: 2011-08-17
刘镇江
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the solubility parameters of polymethacrylate and polyvinyl chloride are close, some researchers are curre

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Polyvinyl chloride 17Kg, polymerization degree 1000, methyl methacrylate-methacrylic acid copolymer 1Kg, number average molecular weight (Mn) 1×10 4 , wherein the molar content of methacrylic acid monomer is 30%, polyethylene glycol 400 4Kg, dimethylformamide 87Kg, dibutyltin dilaurate 0.2Kg, prepare the film-making solution under the environment of 40 ℃, Use desalted water at 15°C as the inner and outer gel medium, spin at a speed of 50m / min, and enter the outer gel medium to form a film after going through a vertical dry spinning process in 30cm air, and then wash with the desalinated water, Immerse in 20% glycerin aqueous solution and soak for 30 hours, take out and dry to make the finished film.

[0044] The average micropore diameter of the finished membrane produced by the membrane-making solution and method of this embodiment is 0.008 μm, the porosity is 62%, and the tensile strength is 1.12N / mm 2 , the elongation at break is 51%, and the pure water flux under 0...

Embodiment 2

[0046] Polyvinyl chloride 9Kg, polymerization degree is 1600, methyl methacrylate-methacrylic acid copolymer 1Kg, number average molecular weight is 4×10 4 , wherein the molar content of methacrylic acid monomer is 35%, methyl methacrylate 1Kg, polyethylene glycol 400 5.5Kg, N-methylpyrrolidone 83.3Kg, dioctyltin dilaurate 0.2Kg, at 44 ℃ Prepare the film-making solution under environmental conditions, use desalted water at 19°C as the inner and outer gel medium, spin at a speed of 48m / min, and enter the outer gel medium to form a film after going through a vertical dry spinning process in the air of 27cm. After being washed with desalinated water, immersed in 23% glycerin aqueous solution for 28 hours, taken out and dried in the air to obtain a finished film.

[0047] The average micropore diameter of the finished membrane produced by the membrane-making solution and method of this embodiment is 0.01 μm, the porosity is 70%, and the tensile strength is 1.17 N / mm 2 , the elong...

Embodiment 3

[0049] Polyvinyl chloride 10Kg, the degree of polymerization is 2000, methyl methacrylate-methacrylic acid copolymer 1Kg, the number average molecular weight is 7×10 4 , wherein the molar content of methacrylic acid monomer is 40%, methyl methacrylate 1.8Kg, polysulfone (Mn=340,000) 0.7Kg, polyvinylpyrrolidone K30 7Kg, dimethylacetamide 79.2Kg, methyl tin mercaptide 0.3Kg, prepare the film-making solution at 49°C, use desalted water at 26°C as the inner and outer gel medium, spin at a speed of 41m / min, and enter the outer gel after a vertical dry spinning process in the air of 24cm. Form a film in a gel medium, wash with desalinated water, soak in 29% glycerin aqueous solution for 26 hours, take it out and dry it in the air to obtain a finished film.

[0050] The average micropore diameter of the finished membrane produced by the membrane-making solution and method of this embodiment is 0.013 μm, the porosity is 71%, and the tensile strength is 1.35 N / mm 2 , the elongation at...

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Abstract

The invention relates to a modified polyvinyl chloride alloy ultra-filtration membrane and a preparation method of a modified polyvinyl chloride alloy hollow fiber ultra-filtration membrane. The modifier in membrane preparation solution is a macromolecular modifier, the main component in the macromolecular modifier is methyl methacrylate-methacrylic acid copolymer, the macromolecular modifier can also contain a certain amount of methyl methacrylate, and the finished membrane is modified by using the synergetic effect of the methyl methacrylate-methacrylic acid copolymer and the methyl methacrylate; and the membrane preparation solution consists of the following components in part by mass: 8 to 17 parts of polyvinyl chloride, 1 to 8 parts of macromolecular modifier, 4 to 18 parts of pore forming agent, 57 to 87 parts of solvent, and 0.2 to 1 part of stabilizing agent. The tensile strength, the elongation at break, the hydrophilic property and the surface flatness of the ultra-filtration membrane, particularly the hollow fiber ultra-filtration membrane prepared by adopting the membrane preparation solution and using a dry-wet method are greatly improved; the ultra-filtration membrane has high pollution resistance and pure water flux; and the adopted main materials have wide source and low cost, the membrane preparation cost is greatly reduced, and large-scale popularization and application of the ultra-filtration membrane in the water treatment industry are favorable.

Description

technical field [0001] The invention relates to a polymer ultrafiltration membrane and a preparation method thereof, in particular to a modified polyvinyl chloride alloy ultrafiltration membrane with good hydrophilicity and relatively high strength and a preparation method thereof for a hollow fiber membrane. Background technique [0002] The membrane-forming polymers commonly used in the ultrafiltration membrane industry have developed from early cellulose acetate to today’s polysulfone, polyacrylonitrile, polyethersulfone, and polyvinylidene fluoride. Although these membrane materials have their own advantages, they are all have their own limitations. For example, cellulose acetate is easily hydrolyzed under alkaline conditions, the use temperature is low, the applicable pH range is narrow, only 3-7, and it is not resistant to bacterial and microbial corrosion; the alkali resistance of polyacrylonitrile is not good, The formed membrane is brittle; while polysulfone, polye...

Claims

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Application Information

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IPC IPC(8): B01D71/30B01D69/08C02F1/44
Inventor 刘镇江
Owner 刘镇江
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