Molecular sieve doped porous support layer polyamide reverse osmosis membrane

Abstract

The invention provides a molecular sieve doped porous support layer polyamide reverse osmosis membrane, which comprises a porous support layer and a polyamide separation layer formed on the porous support layer, and the porous support layer comprises a molecular sieve coated with an interfacial polymerization polyamide modification layer. The periphery of the molecular sieve is coated with polyamide, so that the modified molecular sieve is similar to a supporting layer polymer material in property, and the compatibility of an organic phase and an inorganic phase in the supporting layer is greatly improved. The participation of the polyamide modification layer in the support layer reduces the thermal expansion coefficient difference between the support layer and the separation layer, the acyl chloride group of the polyamide modification layer can react with the subsequent aqueous phase monomer, and the binding force between the support layer and the separation layer is increased.

Description

Technical field [0001] The present invention relates to a membrane material, and more particularly to a polyamide reverse osmosis membrane. Background technique [0002] The separation membrane technology has been widely used in recent years and is a new type of separation technology. According to the application field, the membrane material is divided into medium filtration, ultrafiltration, nanofiltration, reverse osmosis, permeable vaporization, gas separation membrane, etc., and reverse osmosis is a film type applied to water treatment. The polyamide is a relatively common reverse osmosis membrane material. [0003] In the preparation of the polyamide reverse osmosis membrane, generally adopted an interface polymerization method, and the routine interface polymerization is generally generally general, limited in a particular application. To improve membrane flux, R & D persons try to mix inorganic particles, such as separating layers or support layers, such as graphene, carbo...

AI Technical Summary

Problems solved by technology

However, molecular sieves are easy to agglomerate during the blending process, and there are compatibility problems between molecular sieves and organic materials.

Moreover, since the material of the support layer is different from that of the separation layer, it is easy to separate the separation layer from the support layer due to the difference in coefficient of thermal expansion during use.