Polyvinylidene fluoride (PVDF) hollow-fiber membrane with base material and production method thereof

A technology of polyvinylidene fluoride and fiber membrane, which is applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc. It can solve problems such as difficult control, complicated operation, and low efficiency, so as to improve production efficiency and increase spinning Quantity, effect of guaranteed gel time

Active Publication Date: 2010-01-27
BEIJING ORIGIN WATER FILM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these two methods have limited prolongation of the gel time, and have the defects of low efficiency, complicated operation and difficult control
[0009] The strength

Method used

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  • Polyvinylidene fluoride (PVDF) hollow-fiber membrane with base material and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] First prepare the film-making feed solution:

[0088]Mix the polyvinylidene fluoride resin, N-methylpyrrolidone solvent, and polyethylene glycol additives sold by Sanaifu under the trade name PVDF in a weight ratio of 15:80:5, stir them evenly with a mechanical mixer, and then use a decompression The method is to carry out defoaming, and the film-making feed liquid made after defoaming is placed in the feed liquid tank;

[0089] Then prepare the mixture:

[0090] The N-methylpyrrolidone solvent and water are formulated into a mixed liquid according to a weight ratio of 10:90, which is used as a spinning gel bath liquid for circulation.

[0091] Then, prepare polyvinylidene fluoride hollow fiber membrane with substrate under the following conditions:

[0092] Put 10 rolls of glass fiber rope on the fiber rope coiling machine. 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 heating plate...

Embodiment 2

[0098] First prepare the film-making feed solution:

[0099] 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;

[0100] Then prepare the mixture:

[0101] The dimethylformamide solvent and water are formulated into a mixed liquid according to a weight ratio of 15:85, which is used as a spinning gel bath for circulation.

[0102] Then, prepare polyvinylidene fluoride hollow fiber membrane with substrate under the following conditions:

[0103] Place 3 rolls of glass fiber rope on the fiber rope coiling machine, the outer diameter of the glass fiber is 2.0mm, the inner diameter is 1.4mm, and the wall thickness of the fiber rope is 0.3mm; the heating plate is a cub...

Embodiment 3

[0107] First prepare the film-making feed solution:

[0108] Mix the polyvinylidene fluoride resin, dimethylacetamide solvent, and hydroxyethyl cellulose additives sold by Kureha under the trade name PVDF in a weight ratio of 14:84:2, 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;

[0109] Then prepare the mixture:

[0110] The dimethylacetamide solvent and water are formulated into a mixed solution according to a weight ratio of 5:95, which is used as a spinning gel bath for circulation.

[0111] Then, under the same conditions as in Example 1, a polyvinylidene fluoride hollow fiber membrane with a substrate was produced.

[0112] The performance of the polyvinylidene fluoride hollow fiber membrane with substrate obtained is as follows:

[0113] The average pore size is 0.15 microns, the inner diameter is 0.8 mm, the outer diameter is 1.7 mm,...

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Abstract

The invention relates to a polyvinylidene fluoride (PVDF) hollow-fiber membrane with a base material, which has an average aperture of 0.03-0.5 micrometer, an inner diameter of 0.4-1.8 millimeters, an outer diameter of 1.1-4.5 millimeters, a strength of 200-500N and a pure water flux of 500-10,000L/m<2>/h at 25 DEG C under atmospheric pressure. The invention also relates to a production method of the hollow-fiber membrane with a base material, which can solve the essential problem of low gel efficiency of the PVDF hollow-fiber membrane with a base material (hollow-fiber rope) so as to solve the problems of poor membrane homogeneity, wide aperture distribution, low spinning speed, high production cost, and the like.

Description

【Technical field】 [0001] The invention relates to the technical field of wastewater treatment, and more specifically, the invention relates to a polyvinylidene fluoride hollow fiber membrane with a base material, and a method for producing the membrane by intermittent static gelation. 【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 materials for water treatment include polysulfone, polyacrylonitrile, polyvinyl chloride, polypropylene, polyvinylidene fluoride (PVDF) and the like. Among them, po...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D69/08B01D69/10B01D67/00
Inventor 文剑平范璐李锁定陈亦力
Owner BEIJING ORIGIN WATER FILM TECH
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