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laminated semipermeable membrane

A technology of semi-permeable membrane and semi-permeable layer, which is applied in the direction of semi-permeable membrane separation, membrane, coating, etc., can solve the problem of reducing the water permeability of reverse osmosis membrane

Active Publication Date: 2021-09-10
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] On the other hand, as one of the problems occurring in a water generation device using a reverse osmosis membrane, there is fouling caused by membrane fouling substances such as inorganic substances and organic substances.
The water permeability of the reverse osmosis membrane is significantly reduced due to fouling

Method used

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Examples

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Embodiment

[0217] Hereinafter, the present invention will be described more specifically using examples. However, the present invention is not limited by these Examples.

[0218] The IR spectra in Comparative Examples and Examples, the X-ray photoelectron spectroscopy of the composite semipermeable membrane, and the surface zeta potential at pH 7 were measured as follows.

[0219] (Equilibrium of composite semipermeable membrane under constant temperature and relative humidity conditions)

[0220] The relative humidity of air in equilibrium with a saturated aqueous solution of salt is determined by the type of salt and the temperature of the solution. Therefore, a state of equilibrium can be provided and a defined relative humidity produced by maintaining the vessel containing the saturated aqueous solution of salt at a certain temperature. The relative humidity corresponding to various salts is shown in Table 1. The method of adjusting the relative humidity in the above manner is cal...

reference example 1

[0246] Using a UV irradiation device, as monomers (3-vinylimidazolium) acetate ((3-vinylimidazolio) acetate) 50mM, N,N-dimethylacrylamide 50mM, N-hydroxyethylacrylamide 50mM A mixed aqueous solution of 10 mM of a photopolymerization initiator 2,2-dimethoxy-2-phenylacetophenone was irradiated with 365 nm ultraviolet rays to obtain a polymer solution. The irradiation intensity of the UV irradiation device is 20mW / cm as the value measured by the ultraviolet cumulative light meter 2 way to set it.

reference example 2～9

[0248] A polymer solution was obtained in the same manner as in Reference Example 1 except that the monomers described in Table 2 were used instead of the monomers described in Reference Example 1.

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Abstract

The present invention relates to a laminated semipermeable membrane satisfying the following conditions. (A) In the difference spectrum between the IR spectrum measured at 25°C and a relative humidity of 97%, and the IR spectrum measured at 25°C and a relative humidity of 3%, 3700 to 2900cm ‑1 The intensity of the largest peak among them is 0.08 or more. (B) 3700-2900cm of the above difference spectrum ‑1 The peak wave number between them is 3400cm ‑1 Above and 3550cm ‑1 the following. (C) In the X-ray photoelectron spectroscopy measurement in which the coating layer is irradiated with X-rays, the N1s peak has a maximum value at 401 eV or higher.

Description

technical field [0001] The present invention relates to a semipermeable membrane useful for the selective separation of liquid mixtures, and to a laminated semipermeable membrane excellent in oxidation resistance and fouling resistance. Background technique [0002] As water treatment separation membranes that prevent the permeation of solute components, asymmetric semipermeable membranes formed of polymers such as cellulose acetate, and separation membranes provided with a microporous support layer and provided on the microporous support layer are known. Composite semipermeable membrane with functional layer. [0003] Especially for composite semipermeable membranes having a separation function layer formed of polyamide (hereinafter referred to as "polyamide separation function layer"), it has the ability to utilize interfacial polycondensation of polyfunctional amines and polyfunctional acid halides to facilitate In addition, it has high pressure resistance, can achieve h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/12B01D67/00B01D69/10B01D71/40B01D71/56B01D71/82B32B27/00
CPCB01D71/56B01D71/82B01D67/0006B01D69/125B01D71/62B01D2323/30B01D2325/14B01D2325/26B01D71/40B01D2323/34B32B27/36B32B3/26B32B27/34B32B2270/00B32B23/04B32B27/304B32B27/08B32B27/288B32B2255/26B32B27/12B32B23/08B32B2255/10B32B27/10B32B27/308B32B2307/714B32B2307/732B32B23/06B32B2307/726B32B2307/734B32B2307/308B32B2307/20B32B27/286B32B23/10B32B2262/02B32B2307/7145B32B5/022B32B2250/03B32B27/32B01D2325/43B01D69/1213B01D69/1214B01D67/0079B01D69/10B01D67/00931B01D67/0088B01D2325/16B01D2325/04B32B27/00B01D2325/028
Inventor 德山尊大小川贵史富冈洋树
Owner TORAY IND INC
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