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

AI Technical Summary

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

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

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0037] The present invention provides a purple diplomatic PVDF hollow fiber membrane and preparation method thereof, the present invention will have a hydrophilic photoinitiator molecular chain of the nascent hollow fiber membrane through ultraviolet irradiation, crosslinking reaction, the formation of a semi-interpenetrating structure, while generating a hydroxyl hydrophilic group, membrane hydrophilic and mechanical properties are improved, the degree of reaction is easy to control, can achieve continuous operation. The present method The present invention uses the photoinitiator 4-ABP and hydrophilic monomers to occur free radical polymerization in PVDF solution, the synthesized molecular chain and the PVDF molecular chain are interlaced, the primary PVDF hollow fiber membrane is prepared by dry and wet spinning technology, and then through ultraviolet light irradiation, the photoinitiator undergoes a hydrogen-grabbing reaction, the excited state photoinitiator molecules seize ...

Example Embodiment

[0040] Example 1

[0041] (1) PVDF, 4-ABP, N, N-dimethylformamide, polyvinylpyrrolidone-k30, azodiisobutyronitrile and acrylamide for blending, at a water bath at 70 °C, through the nitrogen reaction for 6h, static defoaming, to give a cast film liquid; the PVDF: 4-ABP: N, N- dimethylformamide: polyvinylpyrrolidone -k30: azodiisobutyronitrile: acrylamide mass ratio of 15: 0.2: 65: 15: 0.1: 4.7;

[0042](2) The casting film liquid in step (1) and 20wt%N, N-dimethylformamide core liquid (25 ° C) at 0.3MPa pressure and 18m / min spinning speed through the ring spin head extruded into a columnar liquid film, the columnar liquid film after the height of 5cm air bath into the 45 °C pure water solidification bath, after the washing tank to prepare the nascent PVDF hollow fiber film;

[0043] (3) The primary PVDF hollow fiber membrane prepared in step (2) passes through the ultraviolet irradiation box, the irradiation time is 5min, the power is 250W, and the purple diplomat PVDF hollow fi...

Example Embodiment

[0044] Example 2

[0045] (1) PVDF, 4-ABP, N, N-dimethylformamide, polyvinylpyrrolidone-k30, azo diisobutyronitrile and methyl acrylate for blending, under a water bath at 70 ° C, through the nitrogen reaction for 8h, standing defoaming, to give a cast film liquid; the PVDF: 4-ABP: N, N- dimethylformamide: polyvinylpyrrolidone -k30: azodiisobutyronitrile: methyl acrylate mass ratio of 18: 0.6: 61: 15: 0.3: 5.1;

[0046] (2) The casting film liquid in step (1) and 20wt%N, N-dimethylformamide core liquid (25 °C) at 0.3 MPa pressure and 15m / min spinning speed through the ring spin head extruded into a columnar liquid film, the columnar liquid film after the height of the air bath of 2cm into the 45 °C pure water solidification bath, after the washing tank to prepare the nascent PVDF hollow fiber film;

[0047] (3) The primary PVDF hollow fiber membrane prepared in step (2) passes through the ultraviolet irradiation box, the irradiation time is 8min, the power is 250W, and the purple ...

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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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