Polyvinylidene fluoride hollow fiber membrane with base material and production method thereof

A polyvinylidene fluoride, fiber membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of low flux, poor hydrophilicity, complex process, etc., to improve flux and strength , long-term hydrophilic effect

Active Publication Date: 2010-08-04
BEIJING ORIGIN WATER FILM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the one-sided gel, there are problems of poor hydrophilicity and low flux
In order to solve this problem, the method of post-setting oxidation treatment is usually adopted, but the process is lengthened, the process is complicated and the oxidation efficiency is low, which restricts the further development of the "lining method" process

Method used

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  • Polyvinylidene fluoride hollow fiber membrane with base material and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] First prepare the film-making feed solution:

[0077] Mix polyvinylidene fluoride resin, N-methylpyrrolidone solvent, and polyethylene glycol additives sold by Sanaifu Company under the trade name PVDF in a weight ratio of 15:80:5, stir them evenly with a mechanical mixer, and then use a negative pressure The method is to carry out defoaming, and the film-making feed liquid made after defoaming is placed in the feed liquid tank;

[0078] Next prepare the gel bath:

[0079] N-methylpyrrolidone solvent, water and sodium hypochlorite oxidizing agent are formulated into a mixed liquid according to a weight ratio of 60:35:5, which is used as a gel bath for circulation.

[0080] Then, prepare polyvinylidene fluoride hollow fiber membrane with substrate under the following conditions:

[0081] Place the glass fiber rope on the wire feeder, the outer diameter of the glass fiber is 1.3mm, the inner diameter is 0.9mm, and the wall thickness of the fiber rope is 0.2mm; the windi...

Embodiment 2

[0097] First prepare the film-making feed solution:

[0098] Mix polyvinylidene fluoride resin, dimethylformamide solvent, and polyvinylpyrrolidone additives sold by Solvay under the trade name Solef in a weight ratio of 22:68:10, stir them evenly with a mechanical mixer, and then use a decompression Degassing is carried out by the method, and the film-making feed liquid made after degassing is placed in the feed liquid tank;

[0099] Next prepare the gel bath:

[0100] Dimethylformamide solvent, water, and ammonium persulfate oxidizing agent are formulated into a mixed solution in a weight ratio of 14:85:6, which is used as a gel bath for circulation.

[0101] Then, prepare polyvinylidene fluoride hollow fiber membrane with substrate under the following conditions:

[0102]Put the glass fiber rope on the fiber rope feeding machine, the outer diameter of the glass fiber is 2.0mm, the inner diameter is 1.4mm, the wall thickness of the fiber rope is 0.3mm; the winding speed of...

Embodiment 3

[0118] First prepare the film-making feed solution:

[0119] Mix the polyvinylidene fluoride resin, dimethylacetamide solvent, and hydroxyethyl cellulose additives sold by Kureha under the trade name PVDF in a weight ratio of 14:78:2, stir them evenly with a mechanical mixer, and then use a decompression Carry out defoaming, and the film-making feed liquid made after defoaming is placed in the feed liquid tank;

[0120] Next, prepare the gel bath:

[0121] The dimethylacetamide solvent, water and potassium persulfate oxidizing agent are formulated into a mixed solution in a weight ratio of 5:85:10, which is used as a gel bath for circulation.

[0122] Then, under the same conditions as in Example 1, a polyvinylidene fluoride hollow fiber membrane with a substrate was produced.

[0123] The performance of the polyvinylidene fluoride hollow fiber membrane with substrate obtained is as follows:

[0124] The average pore diameter of the obtained hollow fiber membrane was measur...

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Abstract

The invention relates to a polyvinylidene fluoride (PVDF) hollow fiber membrane with a base material and a production method thereof. The average pore size of the membrane is 0.04-0.4mu m, the inner diameter and the outer diameter of the hollow fiber of the membrane are respectively 0.5-1.6mm and 1.0-4.0mm, the strength of the membrane is 100-300N, the wetting angle of the membrane is less than 60 degrees and the pure water flux under 25 DEG C and an atmospheric pressure is 100-400L/m2.h. The invention also relates to the production method of the hollow fiber membrane with the base material. The radical problems of poor hydrophilicity and low flux of the PVDF hollow fiber membrane with the base material (the hollow fiber rope) can be solved by the production method.

Description

【Technical field】 [0001] The present invention relates to the technical field of wastewater treatment, and more specifically, the present invention relates to a method for producing said membrane with a polyvinylidene fluoride hollow fiber membrane with a base material, which is characterized in that the gel process and the process of oxidative cross-linking to form long-term hydrophilicity are simultaneously complete, rather than separately. 【Background technique】 [0002] With the rapid development of my country's economy, water resources have become more and more restrictive factors for economic development. Therefore, it has become an inevitable trend to reduce sewage discharge and recycle water. The traditional sewage treatment process can no longer meet the new requirements, and a new process-membrane water treatment has emerged as the times require. This process has been increasingly used in water purification and sewage recycling. [0003] Commonly used membrane mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D69/08B01D67/00
Inventor 文剑平范璐李锁定陈亦力
Owner BEIJING ORIGIN WATER FILM TECH
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