Polymetafluoroethylene/organic clay nanometer composite ultra-low pressure ultrafiltering membrane and its preparation method

Abstract

The invention relates to a polyvinylidene fluoride / organic clay nano composite ultralow pressure ultrafiltration membrane and a preparation method thereof, and to a nano composite membrane and a preparation method thereof. The invention resolves the problem that the existing membrane material has a bad hydrophilicity and a low surface energy and is easily be polluted, and the existing modified method has the disadvantage that it can not run under ultralow pressure and the running cost is high. It is composed of 20-50 shares by weight of PVDF, 0.1-20 shares by weight of organic clay, 10-1000 shares by weight of disperse medium, 10-50 shares by weight of organic addition agent and 0.1-30 shares by weight of inorganic additive. The invention adds the organic clay, inorganic additive, organic addition agent and PVDF in turns into the disperse medium to get the casting film liquor after 3-48 hours dissolution and 5-24 hours stewing deaeration; plate membrane, tubular type membrane, hollow fibre membrane, and comparable membrane module can be prepared. The invention can change the hydrophilicity of the composite membrane, resolve the pollution of exiting membrane effectively, increase the water flux and retain ratio, extend the washing period, raise the treating capacity, and realize the large scale use and run in ultralow pressure.

Description

Technical field:

[0001] The invention relates to a nanocomposite membrane and a preparation method thereof, in particular to a nanocomposite membrane used for ultra-low pressure operation in water treatment and chemical separation processes and a preparation method thereof. Background technique:

[0002] Membrane treatment technology is the preferred technology for drinking water treatment in the 21st century. Compared with conventional water treatment technology, it has the advantages of low energy consumption, high separation efficiency, simple process, no need to add additives, and no impact on human health. However, due to concentration polarization The existence of problems such as membrane fouling and other problems lead to the decline of permeation flux with the extension of operation time; a large amount of energy consumption in the operation process is used for the recirculation of raw material liquid to control concentration polarization and membrane fouling, which ...