Hollow fiber nanofiltration membrane and preparation method thereof

Abstract

The invention discloses a hollow fiber nanofiltration membrane. The hollow fiber nanofiltration membrane is prepared from the following substances in parts by mass: 1-2 parts of polyacrylonitrile, 0.02-0.05 part of nano bamboo carbon fiber, 0.01-0.02 part of nano silver powder, 2-4 parts of a dispersant, 0.01-0.05 part of an active addition agent and 20-30 parts of an organic solvent through a multi-channel membrane spraying technology, the internal pore diameter of the nanofiltration membrane is 0.3 mm to 0.5 mm, the external pore diameter of the nanofiltration membrane is 0.7 mm to 0.9 mm, and the average membrane pore diameter of the wall nanofiltration membrane is 0.001 [mu]m to 0.01 [mu]m. The hollow fiber nanofiltration membrane is prepared from the polyacrylonitrile, the nano bamboocarbon fiber and the nano silver powder, negative oxygen ions can be released through the nano bamboo carbon fiber, by combining with the sterilization and disinfection functions of silver ions, thehollow fiber nanofiltration membrane has the functions of inhibiting bacterium growth, cleaning surrounding air, preventing infectious diseases and the like; and it is ensured that a knockout is fullyfilled with membrane-making fluid quickly and then the membrane-making fluid reaches a membrane-making fluid spraying cavity through a plurality of spraying channels, of multiple sets of nanofiltration membranes can be simultaneously produced, and the production efficiency is greatly improved.

Description

technical field [0001] The invention relates to the technical field of membrane separation, in particular to a hollow fiber nanofiltration membrane mainly used in drinking water equipment and a preparation method thereof. Background technique [0002] With the rapid development of science and technology, consumers' requirements for quality of life are constantly improving, especially in the field of daily life. The quality and safety of drinking water are more and more concerned by consumers. There are various water purification equipment on the market. Walk into thousands of households. [0003] Nanofiltration membrane is a pressure-driven separation membrane between reverse osmosis and ultrafiltration. In application, nanofiltration membrane has two remarkable features: first, its molecular weight cut-off is between reverse osmosis membrane and ultrafiltration membrane, about 200-2000, and can intercept low molecular weight organic substances such as sugar; The functiona...

AI Technical Summary

Problems solved by technology

[0004] Most of the commercial nanofiltration membranes on the market are composite membranes. The so-called conformable nanofiltration is composed of an ultrafiltration layer and a dense composite layer. While maintaining the excellent physical and chemical properties of the base membrane, the composite layer determines the high selection of nanofiltration membranes. The composite nanofiltration membrane has the advantages of high pure water flux and good retention effect, but the preparation steps of this composite nanofiltration membrane are cumbersome, the process is complicated, the production efficiency is low, and the cost is higher. Therefore, , the practicability is relatively poor, it is only in the experimental stage, and has not yet reached the level of commercial mass production

Images