High-strength, solvent-resistant and anti-pollution hollow fiber reverse osmosis membrane and preparation method thereof

Abstract

The invention discloses a high-strength, solvent-resistant and anti-pollution hollow fiber reverse osmosis membrane. The reverse osmosis membrane is prepared from components in parts by weight as follows: 65-70 parts of a hydroxyl-containing polymer, 4.9-9.9 parts of hydroxyl-containing hydrophilic inorganic nanoparticles, 0.1-0.3 parts of an antioxidant and 15-30 parts of a plasticizer. The invention further discloses a preparation method of the reverse osmosis membrane. The high-strength, solvent-resistant and anti-pollution hollow fiber reverse osmosis membrane can form an effective desalination layer, has higher hydrophilic performance, high acid and base hydrolysis resistance and solvent resistance and excellent mechanical properties and is high in chemical cleaning pure water flux recovery rate, high in desalination rate and high in pollution resistance. The problems that hollow fiber membranes prepared through traditional interfacial polymerization have non-uniform desalination layer thickness and low desalination rate. The preparation method is simple to operate, the conditions are mild and easy to control, and the cost is low.

Description

technical field [0001] The invention relates to a high-strength solvent-resistant and anti-pollution hollow fiber reverse osmosis membrane and a preparation method thereof, specifically belonging to the technical field of membrane separation. Background technique [0002] Reverse osmosis membranes are widely used in drinking water, river water, industrial water, brackish water and seawater desalination and other fields. At present, there are two types of reverse osmosis membranes on the market: roll-type reverse osmosis membranes with aromatic polyamide desalination layer formed by interfacial polymerization and cellulose acetate hollow fiber reverse osmosis membranes prepared by melt spinning. Compared with roll-type membranes, hollow fiber membranes have the advantages of high packing density, self-supporting, and backwashing, and are one of the future development directions of reverse osmosis membranes. However, the desalination layer formed by interfacial polymerization...

AI Technical Summary

Problems solved by technology

Although cellulose acetate contains hydroxyl functional groups that can be cross-linked, the number is small. Not only is it difficult to effectively cross-link to form a desalination layer with a high desalination rate, but also cross-linking reactions with hydroxyl groups (such as esterification, acetal, etc.) chemical reaction, etc.) need to be carried out under acid or alkali catalyzed conditions, while cellulose acetate is hydrolyzed in the presence of acid or alkali, and the structure of the desalination layer is destroyed instead; (2) In order to improve the anti-fouling performance of the membrane, the membrane Good hydrophilicity is required, and the hydrophilic polymer membrane prepared by non-solvent-induced phase technology is usually soft and not pressure-resistant, which limits the application of reverse osmosis membranes

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