Preparation method of non-woven fabric or weaving cotton cloth supporting ultra-filtration/micro-filtration composite membrane

Abstract

The invention relates to a preparation method of a non-woven fabric or weaving cotton cloth supporting ultra-filtration / micro-filtration composite membrane, belonging to the field of membrane materials; the preparation method comprises the following steps of: preparing a casting membrane solution by using PVC (PolyVinyl Chloride) as a main raw material, scraping a primary supporting liquid membrane on a non-woven fabric or a weaving cotton cloth, gelating the primary supporting liquid membrane in a solidifying liquid, washing and leaching, and finally drying into finished products. The composite membrane prepared by the method is finger-shaped on the surface; one side of the interior of the membrane, which is close to a supporting layer, is a high asymmetrical hole structure with spongy holes; the supporting membrane is reversible in terms of dry and wet, is not easy to block, has high bursting strength and excellent soiling resistance and is easy to wash reversely and regenerate; bore diameters are in the range of 0.01mum to 1.0mum and can be adjusted; and therefore, the non-woven fabric or weaving cotton cloth supporting ultra-filtration / micro-filtration composite membrane is suitable for secondary filter, recycled water treatment, cartridge filtration before RO (Reverse Osmosis), terminal secondary filter, direct drinking filtration of running water, sewage treatment and liquid purification and filtration.

Description

technical field [0001] The invention belongs to a method for preparing a membrane material, in particular to a method for preparing a non-woven fabric, woven fabric supporting non-asymmetric polyvinyl chloride dry-wet reversible ultra / microfiltration composite membrane. Background technique [0002] Polyvinyl chloride (PVC) is a traditional polymer material with good chemical stability and high mechanical strength. There are stable industrial products in my country, and it has been paid enough attention since the early stage of film development in my country. Its low price, strong resistance The advantages of acidity and alkalinity make it widely developed in the field of membrane separation technology. However, the hydrophilicity of PVC material is poor, the membrane separation efficiency is low, and the anti-pollution ability is also poor. The water permeability rate of dry and wet membranes is very different, so most of the products are wet membranes that are plasticized w...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome above-mentioned defective, provide a kind of non-woven fabric, woven fabric support highly asymmetric polyvinyl chloride dry-wet reversible ultra / microfiltration composite membrane preparation method, the composite membrane prepared with this method has solved existing The homogeneous microporous membrane prepared by the phase inversion wet method can be used to make a variety of membrane modules due to its easy clogging, rapid flow failure, low strength and difficulty in cleaning, which affect its service life.

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