Polypropylene hollow fiber ultrafiltration membrane coated with polymer composite coating

Abstract

The invention relates to a polypropylene hollow fiber ultrafiltration membrane coated with a polymer composite coating. The polypropylene hollow fiber ultrafiltration membrane comprises a water inlet surface and a water outlet surface which are respectively coated with a coating; the coating on the water inlet surface comprises the following raw materials: tricresyl phosphate, dioctyl phthalate, a modified polysiloxane polymer, polyether-ether-ketone (PEEK), methenamine and the like; and the coating on the water outlet surface comprises the following raw materials: allyl polyoxy alkyl epoxy ether, pentaerythritol, polyethylene glycol lauric acid diester, polyoxyethylene alkylamine, nano silver and the like. The polypropylene hollow fiber ultrafiltration membrane is capable of increasing the retention rate for macromolecular organic matter and emulsified oil, so that the COD removal rate of sewage is greatly increased, the electrostatic effect on the surface of the membrane is changed, the adsorption for contaminants of the surface of the membrane is prevented, the membrane can be continuously used for a long time under the condition of high membrane flux, and the service life of the membrane is prolonged. The addition of the nano silver effectively improves the antibacterial mildew properties of the membrane.

Description

technical field [0001] The invention relates to a polypropylene hollow fiber ultrafiltration membrane coated with a polymer composite coating, which 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 gaseous substances. The membrane wall is densely covered with micropores, the stock solution passes through one side of the membrane under a certain pressure, the solvent and small molecular solutes pass through the membrane wall to become 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. The macromolecular solute is blocked by the membrane wall and flows out with the concentrate, which can be used continuously for a long time. The filtration process can operate at normal t...

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. Poor acid and alkali resistance, poor antibacterial and antiseptic properties;

[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