Non-woven fabric and woven fabric support ultra/micro-filtration membrane, preparation thereof and tubular composite filtration membrane

Abstract

The invention relates to a non-woven fabric and woven fabric support ultra / micro-filtration membrane, a preparation method thereof and a tubular composite filtration membrane, belonging to the field of polymer microporous membranes. PVC (polyvinyl chloride) is taken as main raw materials for preparing membrane forming liquid, a primary support liquid membrane is prepared on non-woven fabric and is gelatinized in solidification liquid, and then is subjected to water-washing and extraction and finally dried to obtain the support membrane, and the support membrane is coated with a PE (polyethylene) tube for forming the tubular composite filtration membrane. The surface layer of the membrane is in the shape of a finger, one side in the membrane, which is close to a support layer, is in a high asymmetric pore structure with sponge-like pores, and the membrane is reversible in dry and wet performances, can hardly be blocked, has high bursting strength and excellent pollution resistance, and can be back-cleaned and regenerated easily; in addition, the pore diameter of the membrane is adjustable between 0.01 mu m and1.0 mu. The member is suitable for being used as membrane material for precision filtration, reclaimed water treatment, security filtration before RO (reverse osmosis), terminal precision filtration, direct drinking filtration of tap water, sewage treatment and liquid purification and filtration.

Description

Technical field [0001] The invention belongs to the preparation of a membrane material, and particularly relates to a non-woven fabric, woven fabric supported asymmetric polyvinyl chloride dry and wet reversible ultra / microfiltration composite membrane and a preparation method, and a non-woven fabric and woven fabric support asymmetric poly The tubular composite filter membrane of the PE sintered tube supported by the dry-wet reversible ultra-microfiltration composite membrane of vinyl chloride. Background technique [0002] Polyvinyl chloride (PVC) is a traditional polymer material with good chemical stability and high mechanical strength. It has stable industrialized products in my country, and has received enough attention from the early stage of the development of my country’s membranes. Its low price and strong resistance The advantages of acid and alkali have made it widely developed in the field of membrane separation technology. However, PVC material has poor hydrophilici...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome above-mentioned defective, provide a kind of non-woven fabric, woven fabric supporting ultra / microfiltration membrane and preparation method and tubular composite filtration membrane, the composite membrane prepared by this method solves the existing phase inversion wet method The prepared homogeneous microporous membrane can be used to make a variety of membrane components because of its easy clogging, rapid flow failure, low strength, and difficulty in cleaning, which affect its service life; non-woven fabrics, woven soft support super / micro The composite filter membrane is a tubular composite filter membrane that is rigidly supported by PE sintered tubes. Its burst strength is at least 0.5 MPa, and the filtration accuracy can be selectively manufactured between 0.01 and 5 μm. It has large flux, easy back cleaning, and is not easy to block. Meet the needs of fine filtration such as industrial wastewater treatment on-line reuse, secondary wastewater treatment and direct drinking water treatment

Images