High-flux polyvinylidene fluoride hollow fiber membrane

A technology of polyvinylidene fluoride and fiber membrane, which is applied in membrane technology, semi-permeable membrane separation, chemical instruments and methods, etc., can solve the problems of high cost of water treatment, increase water production, reduce manufacturing and use costs, and be flexible The effect of resistance and chemical resistance

Active Publication Date: 2013-05-22
JIANGSU SUJING GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in actual use, the cost of membrane separation to treat water is relatively high

Method used

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  • High-flux polyvinylidene fluoride hollow fiber membrane

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Embodiment 1: A method for preparing a novel high-throughput polyvinylidene fluoride hollow fiber membrane, comprising the following steps:

[0039] (1) Blend polyvinylidene fluoride with solvent, pore forming agent and non-solvent. Among them, dimethylacetamide and triethyl phosphate are selected as solvents, wherein the ratio of dimethylacetamide and triethyl phosphate is 2:3, and the mass ratio of solvent is 70%; then select: the mass fraction is 12 % polyethylene glycol-200 and polyvinylpyrrolidone, wherein the massfraction of polyethyleneglycol-200 is 10%, and the massfraction of polyvinylpyrrolidone is 2%; massfraction is 1% Tween-80; massfraction 1% propylene glycol; the mass fraction of the blend polymer polyvinylidene fluoride is 16%.

[0040] (2) The above blend was stirred into a uniform solution at 80°C, and then statically defoamed at 60°C for 12 hours, so that the temperature of the casting solution was 60°C.

[0041] (3) The degassed casting solution is...

Embodiment 2

[0043] Embodiment 2: A method for preparing a novel high-flux polyvinylidene fluoride hollow fiber membrane, comprising the following steps:

[0044] (1) Blend polyvinylidene fluoride with solvent, pore forming agent and non-solvent. Among them, dimethylacetamide and triethyl phosphate are selected as solvents, wherein the ratio of dimethylacetamide and triethyl phosphate is 1:4, and the solvent accounts for 68% by mass; then select: the mass fraction is 12 % polyethylene glycol-400; the mass fraction is 1% Span-20; the mass fraction is 1% glycerin; the mass fraction of the blended polymer polyvinylidene fluoride is 18%.

[0045] (2) The above blend was stirred into a uniform solution at 85°C, and then statically degassed at 70°C for 12 hours, so that the temperature of the casting solution was 70°C.

[0046] (3) The degassed casting solution is spun into a hollow fiber membrane by dry-wet spinning. During spinning, the spinning dry length is 20cm, the extrusion speed is 15m...

Embodiment 3

[0048]Embodiment 3: A method for preparing a novel high-throughput polyvinylidene fluoride hollow fiber membrane, comprising the following steps:

[0049] (1) Blend polyvinylidene fluoride with solvent, pore forming agent and non-solvent. Among them, dimethylacetamide and triethyl phosphate are selected as the solvent, wherein the ratio of dimethylacetamide and triethyl phosphate is 1:4, and the solvent accounts for 63% by mass; then select: the mass fraction is 10 % of polyethylene glycol-400; the mass fraction of 2% sodium dodecylbenzene sulfonate; the mass fraction of 1% ethylene glycol; the mass fraction of the blend polymer polyvinylidene fluoride is 24%.

[0050] (2) Stir the above blend at 70°C to form a homogeneous solution, and then statically defoam at 60°C for 12 hours, so that the temperature of the casting solution is 60°C.

[0051] (3) The degassed casting solution is spun into a hollow fiber membrane by dry-wet spinning. During spinning, the spinning dry lengt...

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Abstract

The invention relates to a high-flux polyvinylidene fluoride hollow fiber membrane which is in an asymmetrical structure. From outside membrane fibers to the hollow inside, the high-flux polyvinylidene fluoride hollow fiber sequentially comprises a compact outer skin layer, a first structural layer with finger-like pores, a spongy layer with abundant pores, a second structural layer with finger-like pores and an inner skin layer, wherein the finger-like pores in the first structural layer are larger than those in the second structural layer. The high-flux polyvinylidene fluoride hollow fiber membrane is prepared through a dry-wet spinning process. According to the invention, the polyvinylidene fluoride hollow fiber membrane is in a five-layer structure; above all, the loose spongy layer structure ensures that the polyvinylidene fluoride hollow fiber membrane has high pure water flux and high filtration accuracy; and meanwhile, the polyvinylidene fluoride hollow fiber membrane also has the advantages of satisfactory flexibility and chemical resistance of a polyvinylidene fluoride material. Thus, the water yield in unit membrane area can be effectively increased, and the manufacturing and use cost of a membrane component can be lowered.

Description

technical field [0001] The invention relates to a polyvinylidene fluoride hollow fiber membrane, in particular to a polyvinylidene fluoride hollow fiber membrane with high flux. Background technique [0002] With the rapid growth of social economy, the increasing shortage of water resources has become an important factor restricting economic and social development. [0003] Membrane separation and purification technology has great advantages and potential in water treatment and other environmental protection fields because of its advantages such as high separation efficiency, simple equipment, convenient operation, high degree of automation, and no secondary pollution. Polymer organic membrane plays an important role in the field of membrane separation, and its production process is simple, and the variety of membrane materials is relatively diverse. [0004] Polyvinylidene fluoride is a fluorocarbon thermoplastic with a melting point of 170°C, a thermal decomposition tempe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/08B01D71/34B01D67/00
Inventor 单永广陈峰张芦斌胡增
Owner JIANGSU SUJING GROUP
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