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PVDF (Polyvinylidene Fluoride) hollow fiber membrane as well as preparation method and application thereof

A fiber membrane and hollow technology, applied in the field of ultraviolet cross-linked PVDF hollow fiber membrane, can solve the problems of poor mechanical properties, narrow membrane pore distribution, low pollution resistance, etc., and achieve improved mechanical properties, high retention, and difficult to break silk effect

Pending Publication Date: 2022-05-13
JIANGSU JIUWU HITECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The first purpose of the present invention is to solve the technical problems of poor hydrophilicity, low pollution resistance and poor mechanical properties of the existing PVDF hollow fiber membranes. The technical solution of the present invention to solve the technical problems of the hollow fiber membranes is to provide a The ultraviolet cross-linking PVDF hollow fiber membrane is characterized in that PVDF, photoinitiator, initiator and hydrophilic monomer are blended and reacted, and the nascent hollow fiber membrane is prepared by a dry-wet method, and then irradiated by an ultraviolet irradiation box. Preparation of UV cross-linked PVDF hollow fiber membrane with semi-interpenetrating structure
[0006] The second object of the present invention is to use the above-mentioned PVDF membrane to solve the problem that when the soybean whey wastewater is reused in the prior art, the protein can not be intercepted and the oligosaccharides can be penetrated at the same time. In the method of the present invention Due to the in-situ UV cross-linking of hydrophilic monomers, on the one hand, the hydrophilicity of the membrane is improved, and the hydrophilic oligosaccharides are more permeable; on the other hand, due to the UV cross-linking treatment, Make the distribution of membrane pores narrower, reduce the large pores on the membrane surface, and increase the retention rate of proteins

Method used

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  • PVDF (Polyvinylidene Fluoride) hollow fiber membrane as well as preparation method and application thereof
  • PVDF (Polyvinylidene Fluoride) hollow fiber membrane as well as preparation method and application thereof
  • PVDF (Polyvinylidene Fluoride) hollow fiber membrane as well as preparation method and application thereof

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preparation example Construction

[0037] The invention provides an ultraviolet crosslinking type PVDF hollow fiber membrane and a preparation method thereof. In the invention, the nascent hollow fiber membrane having a hydrophilic photoinitiator molecular chain undergoes ultraviolet irradiation to undergo a crosslinking reaction to form a semi-interpenetrating structure. At the same time, hydroxyl hydrophilic groups are generated, the hydrophilicity and mechanical properties of the membrane are improved, the degree of reaction is easy to control, and continuous operation can be realized. The method of the present invention uses the photoinitiator 4-ABP and the hydrophilic monomer to undergo free radical polymerization in the PVDF solution, and the synthesized molecular chains and PVDF molecular chains are interlaced, and the nascent PVDF hollow fibers are prepared by dry-wet spinning technology film, and then irradiated by ultraviolet light, the photoinitiator undergoes a hydrogen abstraction reaction, and the ...

Embodiment 1

[0041] (1) Blend PVDF, 4-ABP, N,N-dimethylformamide, polyvinylpyrrolidone-k30, azobisisobutyronitrile and acrylamide, and react with nitrogen in a water bath at 70°C for 6 hours , standing for defoaming to obtain the casting solution; the PVDF: 4-ABP: N, N-dimethylformamide: polyvinylpyrrolidone-k30: azobisisobutyronitrile: the mass ratio of acrylamide is 15: 0.2:65:15:0.1:4.7;

[0042] (2) Extrude the casting liquid in step (1) and 20wt% N,N-dimethylformamide core liquid (25°C) through a circular spinneret at a pressure of 0.3MPa and a spinning speed of 18m / min A columnar liquid film is formed, and the columnar liquid film enters a pure water coagulation bath at 45°C after passing through an air bath height of 5cm, and is washed with a water tank to obtain a nascent PVDF hollow fiber membrane;

[0043] (3) Pass the nascent PVDF hollow fiber membrane prepared in step (2) through a UV irradiation box for 5 minutes with a power of 250 W to prepare a UV cross-linked PVDF hollow fi...

Embodiment 2

[0045] (1) Blend PVDF, 4-ABP, N,N-dimethylformamide, polyvinylpyrrolidone-k30, azobisisobutyronitrile and methyl acrylate, and react with nitrogen gas in a water bath at 70°C 8h, standing for defoaming, to obtain casting solution; the mass ratio of PVDF: 4-ABP: N,N-dimethylformamide: polyvinylpyrrolidone-k30: azobisisobutyronitrile: methyl acrylate is 18:0.6:61:15:0.3:5.1;

[0046] (2) Extrude the casting liquid in step (1) and 20wt% N,N-dimethylformamide core liquid (25°C) through a circular spinneret at a pressure of 0.3MPa and a spinning speed of 15m / min A columnar liquid film is formed, and the columnar liquid film enters a pure water coagulation bath at 45°C after passing through an air bath height of 2cm, and is washed in a water tank to obtain a nascent PVDF hollow fiber membrane;

[0047] (3) Pass the nascent PVDF hollow fiber membrane prepared in step (2) through a UV irradiation box for 8 minutes with a power of 250 W to prepare a UV crosslinked PVDF hollow fiber me...

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Abstract

The invention relates to the technical field of hollow fiber membranes, in particular to a PVDF (Polyvinylidene Fluoride) hollow fiber membrane as well as a preparation method and application thereof. According to the preparation method, the primary hollow fiber membrane with the hydrophilic photoinitiator molecular chain is subjected to ultraviolet radiation, a cross-linking reaction is carried out, a semi-interpenetrating structure is formed, meanwhile, a hydroxyl hydrophilic group is generated, the hydrophilicity and mechanical property of the membrane are improved, the reaction degree is easy to control, and continuous operation can be achieved.

Description

technical field [0001] The invention relates to the technical field of hollow fiber membranes, in particular to an ultraviolet cross-linking PVDF hollow fiber membrane. Background technique [0002] In recent years, with the development of industry and economy, the population has increased, the amount of wastewater and sewage discharge has increased, and the environmental pressure has become heavier, which has seriously endangered the ecological environment and human health. Membrane water treatment technology has gradually become one of the important ways to solve industrial wastewater, urban sewage discharge and efficient recycling due to its simplicity, efficiency, and environmental protection. Polyvinylidene fluoride (PVDF) has become one of the main membrane materials in the market due to its excellent chemical stability, thermal stability, radiation resistance, good mechanical properties and easy film formation, and is widely used in various Water treatment industry. ...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D69/08B01D69/02B01D67/00B01D61/00
CPCB01D71/34B01D69/08B01D69/02B01D67/0006B01D67/0002B01D67/009B01D61/00
Inventor 储智勇王金荣夏维晨秦泗光王肖虎彭文博范克银党建兵
Owner JIANGSU JIUWU HITECH
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