Semi-permeable membrane support material

Abstract

The invention discloses a semi-permeable membrane support material. The semi-permeable membrane support material is a sheet-shaped material obtained by heating and pressurizing after laminating two layers of non-woven fabric with different aspect ratios k. A k value of the non-woven fabric layer adjacent to the coating surface side of the sheet-shaped material is greater than 1.5, and the k valueof the non-woven fabric layer adjacent to the non-coating surface side is less than 1.0. The support material does not generate crimping after hot-pressing while excellent performance of air permeability, tensile strength, no fluff and the like is guaranteed, after the coating surface thereof is coated with a polymer membrane at the same time, a crimping phenomenon does not occur, and a situationadverse to processing is effectively avoided from occurring in a production process.

Description

technical field [0001] The invention belongs to the field of wet-laid non-woven fabrics, and in particular relates to a semipermeable membrane support material and a preparation method thereof. Background technique [0002] In the fields of seawater desalination, deep purification of drinking water, domestic sewage treatment, drug concentration, hemodialysis, food concentration and other fields, semi-permeable membrane, as a high-efficiency filter material, is gradually becoming more and more popular due to its higher efficiency and lower use cost. It has received more and more attention, application and promotion. Semipermeable membranes are generally composed of synthetic resins such as cellulose resins, polyester resins, polysulfone resins, polyamide resins, and fluororesins. When these materials are used as semipermeable membranes, their body strength is low, and it is difficult It can work stably for a long time under the rated working conditions and cannot be used alo...

AI Technical Summary

Problems solved by technology

Although the invention patent uses the method of asymmetric treatment of the upper and lower two-layer structure to try to solve the phenomenon of warping after coating polysulfone solution, but this is to cause the support material to warp in the opposite direction of the coating surface in advance to negatively affect the coating surface Warpage phenomenon, the support material itself has warpage when it is not coated, and it will also cause many problems in the next step of processing

In addition, it has not effectively solved the problem that the stretch ratio of one layer is too large, which affects the strength of the final product

[0007] It can be seen from the existing technology that the preparation of semi-permeable membrane support materials with a multi-layer structure is a more scientific method that has been proven and recognized. For the problem of warping of support materials after heat treatment, the existing patents still cannot provide a better solution.

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