Modified polyurethane hollow fiber membrane for industrial water treatment

Abstract

The invention relates to a modified polyurethane hollow fiber membrane for industrial water treatment. The membrane comprises a water inlet surface layer and a water outlet surface layer. The water inlet surface layer comprises the following raw materials: polycarbonate type polyurethane resin, chloroprene, aminopropyltriethoxysilane, polyurethane, triethanolamine, dibutyl phthalate, glass fibre, polyoxyethylene fatty acid, and dodecylbenzene sulphonic acid. The water outlet surface layer comprises the following raw materials: polycarbonate type polyurethane resin, hydroxypropyl methyl cellulose, maleate, hydroxyl terminated thermoplastic polyester, montmorillonite, polyethylene glycol, triisopropanolamine, polyethylene glycol dilaurate, and ethylene glycol monobutyl ether acetate. The modified polyurethane hollow fiber membrane for industrial water treatment improves retention rate for macro-molecule organic matters, changes electrostatic interaction on surface of the membrane, prevents adsorption of pollutants on the surface of the membrane, increases micropore quantity of the membrane and connectivity, and improves elasticity of the membrane; the membrane with high elasticity is suitable for impact of high water flow.

Description

Technical field [0001] The invention relates to a hollow fiber membrane, in particular to a modified polyurethane hollow fiber membrane used in industrial water treatment, and belongs to the field of water treatment. Background technique [0002] Membrane separation technology is a separation technology widely used in the separation, concentration and purification of solutions or gas substances. The membrane wall is densely packed with micropores, the original solution passes through one side of the membrane under a certain pressure, the solvent and small molecular solutes penetrate the membrane wall as the filtrate, and the macromolecular solutes are retained by the membrane to achieve the purpose of material separation and concentration. The membrane separation process is a dynamic filtration process in which macromolecular solutes are blocked by the membrane wall and flow out with the concentrated liquid, which can be used continuously for a long time. The filtration process ...

AI Technical Summary

Problems solved by technology

[0005] 1. In the process of separating raw water, a large amount of impurities and particles will be deposited on the surface. With the accumulation of impurities, the effective area of ​​the membrane will gradually become smaller, the membrane flux will decrease, and the filtration efficiency will deteriorate;

[0006] 2. The elasticity of the membrane is poor, so it is difficult to be used for the purification of large-flow water bodies;

[0007] 3. The traditional polypropylene hollow fiber ultrafiltration membrane cleaning method is to use gas or liquid backwashing, which requires the introduction of external equipment, and the filtration process must be stopped, which increases the operating cost and easily causes membrane damage