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A semi-permeable membrane support material

A support material and semi-permeable membrane technology, which is applied in the field of semi-permeable membrane support materials and its preparation, can solve the problems of excessively large, ineffectively solved stretch ratio, and affecting the strength of the final product, so as to achieve convenient processing and large CD direction Tensile strength, guaranteed performance effect

Active Publication Date: 2021-04-30
ZHEJIANG FORST NEW MATERIAL RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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  • A semi-permeable membrane support material
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  • A semi-permeable membrane support material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] When preparing the support material, the non-woven fabric layers that have not been hot-pressed are combined and superimposed in pairs, and then hot-pressed.

[0076] The non-woven fabric layer I and the non-woven fabric layer IV are superimposed, the hot pressing temperature is 240° C., and the pressure is 3000 N / cm. A semi-permeable membrane support material is obtained. Gram weight is 70g / m 2 , the aspect ratio k is 1.32. Wherein, the side where the non-woven fabric layer I is located is the coated surface.

Embodiment 2

[0078] When preparing the support material, the non-woven fabric layers that have not been hot-pressed are combined and superimposed in pairs, and then hot-pressed.

[0079] The non-woven fabric layer II and the non-woven fabric layer IV are superimposed, the hot pressing temperature is 240° C., and the pressure is 2300 N / cm. A semi-permeable membrane support material is obtained. Gram weight is 73g / m 2 , the aspect ratio k is 1.73. Wherein, the side where the non-woven fabric layer II is located is the coated side.

Embodiment 3

[0081] When preparing the support material, the non-woven fabric layers that have not been hot-pressed are combined and superimposed in pairs, and then hot-pressed.

[0082] The non-woven fabric layer III and the non-woven fabric layer VI are superimposed, the hot pressing temperature is 320° C., and the pressure is 2500 N / cm. A semi-permeable membrane support material is obtained. Gram weight is 78g / m 2 , the aspect ratio k is 2.62. Wherein, the side where the non-woven fabric layer III is located is the coated side.

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Abstract

The invention discloses a semi-permeable membrane support material, which is a sheet material obtained by laminating two layers of non-woven fabrics with different aspect ratio k and then subjected to heat and pressure treatment, and the non-woven fabric on the side of the sheet material near the coated surface The k value of the layer is greater than 1.5, and the k value of the nonwoven layer near the non-coated side is less than 1.0. While ensuring excellent air permeability, tensile strength, and lint-free properties, the support material will not curl after hot pressing. At the same time, after coating the polymer film on its coating surface, it will not curl, effectively avoiding Unfavorable conditions occur during the 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/10
CPCB01D69/10
Inventor 李房周光大林建华
Owner ZHEJIANG FORST NEW MATERIAL RES INST CO LTD
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