Seawater desalination reverse osmosis membrane support and preparation method

Abstract

The invention discloses a reverse osmosis membrane support for seawater desalination and a preparation method. The reverse osmosis membrane support comprises, in percentage by weight, 40%-60% of polypropylene fibers serving as main fibers, 20%-40% of polyvinyl alcohol fibers serving as supporting fibers and 10%-30% of binding fibers, and the amount of the reverse osmosis membrane support is determined to be 40g / m<2>-120g / m<2>. According to the high salinity and high alkalinity characteristics of to-be-desalinated seawater, the support is mainly prepared from the polypropylene fibers serving as the main fibers, the polyvinyl alcohol fibers serving as the supporting fibers and ES (ethylene propylene) fibers or polyethylene fibers as the binding fibers which all have excellent seawater resistance in technical steps including proportional blending, beating, net forming through wet-process twill weaving, drying and calendering. The coating of the reverse osmosis membrane support has good smoothness and high flatness, the reverse osmosis membrane support has low strength loss in seawater and good structural stability, can be used in a reverse osmosis membrane for seawater desalination stably for a long time and can be widely used for reverse osmosis membrane assemblies for seawater desalination in different temperature environments, and the production process is simple.

Description

technical field [0001] The invention belongs to the technical field of liquid filtration and separation manufacturing, and in particular relates to a reverse osmosis membrane support body for seawater desalination and a preparation method. Background technique [0002] Since reverse osmosis seawater desalination technology was commercialized in the 1970s, its high efficiency, low energy consumption, cleanliness, less pollution, and convenient operation and management have made it an advanced desalination technology today. After more than 50 years of research, development and industrialization, the performance of reverse osmosis seawater desalination membranes and membrane modules has been greatly improved, with a desalination rate as high as 99.8%, and water production increased by more than 2-3 times. [0003] The research on seawater desalination membranes began in the United States. John E.Cadotte first used m-phenylenediamine and trimesoyl chloride to prepare seawater de...

AI Technical Summary

Problems solved by technology

Some documents (Chen Guoqiang, etc., preparation of reverse osmosis membrane support, printing and dyeing auxiliaries [J], 28 (8): 8-10, 2008) and patents [CN102031640B, CN101765456 A, USP5851355] have only reported the use of knitted fabric coating , spun-bonded non-woven materials and wet-laid non-woven materials to prepare the method for separation membrane support body, but this type of support material is all made of polyester fiber, and its structure and performance stability in long-term high-saline alkaline seawater environment are relatively low. Poor, especially at a certain temperature due to the aggravation of the hydrolysis performance of polyester, the morphological stability and apparent flatness of the membrane support are difficult to guarantee

Images