Preparation method of polyurethane hollow fiber filter membrane

Abstract

The invention relates to a method for preparing a high permeation flux polyurethane hollow fiber filter membrane. The method comprises the following steps: a polyurethane prepolymer is obtained by stirring and mixing polyol, isocyanate and prepolymerization adding material; then polyurethane membrane forming gel fluid is generated by adding a solvent, a chain extender and an additive therein; the solvent and the additive are simultaneously used for preparing an inner gel medium; a spinning device is used for carrying out the dry-wet spinning membrane preparation; the treatment is carried out after that to remove the residual solvent and the additive, thereby obtaining the high permeation flux polyurethane hollow fiber filter membrane. The obtained hollow fiber filter membrane has excellent performances, the porosity achieves more than 92 percent, and the permeation flux of purified water can achieve 950 to 1000L / (h*m<2>*1 atmospheric pressure). The hollow fiber filter membrane produced by utilizing the membrane preparation formula, the process and the parameters of the invention has relatively lower cost and can obtain very high permeation flux, thereby having wide industrial application prospect in waste water treatment, separation of medical products from other biochemical products, concentration and other fields.

Description

technical field [0001] The invention relates to a method for preparing a hollow fiber filter membrane, in particular to a method for preparing a polyurethane hollow fiber filter membrane with low cost and high permeation flux. Background technique [0002] Compared with traditional separation technology, membrane separation technology has the advantages of operating at normal pressure, normal temperature or low temperature, no phase change, low energy consumption, high single-stage separation efficiency, no change in the physical and chemical properties of the filtrate, and simple and difficult operation process. Environmental pollution and other significant advantages. This technology has been widely used in chemical industry, electronics, biological engineering, environmental protection engineering and food processing and other fields. In recent years, the serious deterioration of water environment quality and the rapid development of economy urgently require correspondin...

AI Technical Summary

Problems solved by technology

[0003] Commonly used membrane materials are divided into organic membrane materials and inorganic membrane materials. Inorganic membrane materials can be metals, metal oxides, ceramics, porous glass, zeolites, inorganic polymer materials, etc. At present, ceramics are more commonly used as inorganic membrane materials. The advantages are: it can be used in the environment of pH=0~14, pressure P<10MPa, temperature<350°C, its flux is high, energy consumption is relatively low, and it has great competitiveness in the treatment of high-concentration industrial wastewater; disadvantages Yes: expensive, not alkali-resistant, small elasticity, and difficult to process and prepare membranes

Using the same membrane material to make membranes, if different membrane-making processes and parameters are used, the performance of the hollow fiber membranes will be very different.

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