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Preparation method of polyvinylidene fluoride/polyurethane/polyvinyl chloride blend hollow fiber separation membrane

A technology of polyvinylidene fluoride and polyvinyl chloride, which is applied in semipermeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problem of poor hydrophilicity of polyvinylidene fluoride, high brittleness of polyvinyl chloride, and high price And other problems, to achieve good anti-pollution, high compressive strength, low production cost effect

Active Publication Date: 2015-08-12
NINGBO JINGYUAN MEMBRANE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the hollow fiber separation membranes currently used are made of single or two kinds of high polymer materials such as cellulose acetate, polyvinylidene fluoride, polysulfone, polyethersulfone, polyacrylonitrile, polyvinyl chloride, etc. All kinds of polymer materials have their own performance limitations, for example, cellulose acetate has a narrow pH range, polyvinylidene fluoride is not hydrophilic and expensive, polysulfone and polyethersulfone are poorly flexible and expensive, and polyacrylonitrile is easy to age , high brittleness of polyvinyl chloride, easy shrinkage and wrinkling, etc., resulting in poor film effect, low cost performance and short life during use, which limits its wider application

Method used

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  • Preparation method of polyvinylidene fluoride/polyurethane/polyvinyl chloride blend hollow fiber separation membrane
  • Preparation method of polyvinylidene fluoride/polyurethane/polyvinyl chloride blend hollow fiber separation membrane
  • Preparation method of polyvinylidene fluoride/polyurethane/polyvinyl chloride blend hollow fiber separation membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The raw materials are weighed according to the following weight percentages. The brand of polyvinylidene fluoride resin produced by Shanghai Sanaifu New Materials Co., Ltd. is 1.75% of FR904 (intrinsic viscosity: 1.8), and the brand of Tianjin Dagu Chemical Co., Ltd. is DG- 13.5% of 1000 polyvinyl chloride resin, 1.75% of WHT-14 thermoplastic polyurethane resin produced by Yantai Wanhua Polyurethane Co., Ltd., 12% of K-30 polyvinylpyrrolidone produced by Boai Xinkaiyuan Pharmaceutical Co., Ltd. , Anhui Wanwei High-tech Materials Co., Ltd. produced 8% of polyvinyl alcohol with the brand name of 1788, and 63% of dimethylformamide produced by Teramine Lingtian (Nanjing) Fine Chemical Co., Ltd., put the above substances into the reactor in order Stir at 90°C for 48 hours to obtain a casting solution. Naturally stand for defoaming at 80°C for 12 hours, keep the casting liquid at 80°C and 0.5MPa to extrude into the outer hole of the spinneret with double-hole nozzle, and the ...

Embodiment 2

[0033]According to the manufacturing method and conditions described in Example 1, the casting solution weighs the raw materials according to the following weight percentages, and the polyvinylidene fluoride resin produced by Shanghai Sanaifu New Materials Co., Ltd. is 1.67% , Tianjin Dagu Chemical Co., Ltd. produced 11.66% polyvinyl chloride resin with the brand name DG-1000, and Yantai Wanhua Polyurethane Co., Ltd. produced 1.67% thermoplastic polyurethane resin with the brand name WHT-14. Boai Xinkaiyuan Pharmaceutical Co., Ltd. The brand of polyvinylpyrrolidone 10% produced by the company is K-30, the polyethylene glycol 5% of brand PEG-600 produced by Dow Chemical Company of the United States, and the polyvinylpyrrolidone produced by Anhui Wanwei High-tech Materials Co., Ltd. 5% vinyl alcohol, 65% dimethylformamide produced by Teramine Lingtian (Nanjing) Fine Chemical Co., Ltd., put the above substances into the reactor in order, and stir at 80°C for 6 hours to obtain the ...

Embodiment 3

[0035] According to the manufacturing method and conditions described in Example 1, the casting solution weighs the raw materials according to the following weight percentages, and the polyvinylidene fluoride resin produced by Shanghai Sanaifu New Material Co., Ltd. is 1.11% , Tianjin Dagu Chemical Co., Ltd. produced 7.78% of polyvinyl chloride resin with the brand name DG-1000, and Yantai Wanhua Polyurethane Co., Ltd. produced 1.11% of thermoplastic polyurethane resin with the brand name WHT-14. Boai Xinkaiyuan Pharmaceutical Co., Ltd. The brand of K-30 polyvinylpyrrolidone 17% produced by the company, the brand of 1788 polyvinyl alcohol 3% produced by Anhui Wanwei High-tech Materials Co., Ltd. Base formamide 70%, put the above substances into the reactor in order, and stir at 40°C for 40 hours to obtain the casting solution. Naturally stand for defoaming at 40°C for 12 hours, keep the casting liquid at 40°C and 0.2MPa to extrude into the outer hole of the spinneret with doub...

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Abstract

The invention relates to a preparation method of a polyvinylidene fluoride / polyurethane / polyvinyl chloride blend hollow fiber separation membrane, which comprises the following steps: (1) adding polyvinylidene fluoride, polyurethane, polyvinyl chloride, additive and solvent into a reaction kettle, and dissolving by stirring and mixing at 40-90 DEG C for 6-48 hours, thereby obtaining a film casting solution; (2) respectively and simultaneously passing the film casting solution and a core solution through outer and inner holes of a double-hole spinning nozzle to carry out cospinning; (3) evaporating and drawing in an air region between the spinning nozzle and a coagulation bath, and sending into the coagulation bath to implement gelation and curing, thereby obtaining a hollow fiber separation membrane; and (4) cleaning to obtain the hollow fiber separation membrane with a self-supporting layer. The membrane preparation technique provided by the invention has the advantages of high stability and reliability, low manufacturing cost and the like, and is easy to implement; and the prepared hollow fiber separation membrane has the advantages of favorable staining resistance, favorable hydrophilicity, high flexibility, high water flux and high compression strength, and is applicable to the industrial fields of water treatment, wastewater treatment, concentrating separation and the like.

Description

technical field [0001] The invention belongs to the field of preparation of hollow fiber separation membranes, in particular to a preparation method of polyvinylidene fluoride / polyurethane / polyvinyl chloride blended hollow fiber separation membranes. Background technique [0002] As a new type of separation technology, membrane separation technology has been applied in petrochemical, biomedicine, energy and power, municipal water treatment, wastewater reuse and other fields due to its characteristics of environmental protection, energy saving, no phase change, and simple operation. The hollow fiber separation membrane has the characteristics of high packing density, backwashing, and low manufacturing cost, which greatly improves the service life of the membrane and greatly reduces the investment cost. However, most of the hollow fiber separation membranes currently used are made of single or two kinds of high polymer materials such as cellulose acetate, polyvinylidene fluori...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/08B01D71/34B01D71/30B01D67/00
Inventor 吴低潮沈慧媛
Owner NINGBO JINGYUAN MEMBRANE TECH