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Multilayer semipermeable membrane

A semi-permeable membrane and permeable layer technology, applied in the field of laminated semi-permeable membranes, can solve the problems of insufficient durability of the polyamide separation functional layer, poor desalination performance and selective separation performance of the semi-permeable membrane

Active Publication Date: 2017-08-01
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the durability of the polyamide separation functional layer against oxidizing agents is not sufficient, and the desalination performance and selective separation performance of the semipermeable membrane deteriorate under the action of chlorine, hydrogen peroxide, etc. used to sterilize the membrane

Method used

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Examples

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Embodiment

[0184] Hereinafter, the present invention will be described in more detail based on examples. However, the present invention is not limited thereto.

[0185] [1. Film production]

Embodiment 1～6

[0191] (Examples 1 to 6) Semipermeable membrane laminated with polymer

[0192] The following substances were dissolved in water at the following concentrations, that is, 3-acryloyloxypropyltrimethoxysilane belonging to compound (A) at 80 mM, sodium 4-vinylphenylsulfonate belonging to compound (B) 80 mM and 8.5 mM of the photopolymerization initiator 2,2-dimethoxy-2-phenylacetophenone.

[0193] The solution obtained as described above was irradiated with ultraviolet rays of 365 nm using a UV irradiation device, thereby obtaining a polymer solution for forming a polymer layer. Set the irradiation intensity of the UV irradiation device so that the value measured by the ultraviolet integrated light meter becomes 40mW / cm 2 .

[0194] The polymer solution was brought into contact with the polyamide semipermeable membrane (semipermeable layer) of Comparative Example 1 for 30 seconds, and then the excess solution was removed with a spin coater to form a layer of the above polymer s...

Embodiment 7～10

[0198] (Examples 7-10) Semipermeable membrane laminated with polymer

[0199] The reverse osmosis membrane made of cellulose acetate of Comparative Example 2 was used instead of the polyamide semipermeable membrane, and the rotation speed of the spin coater was changed. membrane.

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Abstract

The present invention provides a semipermeable membrane which has oxidant resistance even in the presence of a heavy metal, and which is still capable of achieving a salt removal performance equivalent to that of a semipermeable membrane having poor resistance to oxidants. A multilayer semipermeable membrane according to the present invention is provided with a semipermeable layer and a polymer layer that is formed on the semipermeable layer. The polymer layer contains a polymer that is formed by condensation of a hydrolyzable group of a compound (A) and by polymerization of the compound (A) and a compound (B). (A) A silicon compound having a silicon atom, a reactive group having an ethylenically unsaturated group that is directly bonded to the silicon atom, and a hydrolyzable group that is directly bonded to the silicon atom (B) A compound other than the compound (A), which has a hydrophilic group and an ethylenically unsaturated group.

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. Background technique [0002] As a water treatment separation membrane that prevents the permeation of dissolved components, an asymmetric semipermeable membrane formed of a polymer such as cellulose acetate, and a microporous support layer and a separation function layer provided on the microporous support layer Composite semipermeable membranes are known. [0003] Especially for a composite semipermeable membrane having a separation function layer formed of polyamide (hereinafter referred to as "polyamide separation function layer"), it has They are most widely used because they have advantages such as easy membrane formation, high pressure resistance, high salt rejection rate, and high permeation flux (Patent Documents 1 and 2). [0004] However, the durabilit...

Claims

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Application Information

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IPC IPC(8): B01D71/70B01D69/10B01D69/12B01D71/16B01D71/56C08F230/08
CPCB01D69/10B01D69/12B01D71/16B01D71/56B01D71/70C08F230/085B01D69/02C02F1/44B01D2325/022B01D2325/04B01D2325/30C02F2101/12Y02A20/131B01D69/1213B01D2325/36B01D2325/14B01D2325/16B01D69/1216B01D69/1071B01D2325/0233
Inventor 德山尊大富冈洋树小川贵史铃木祐太郎
Owner TORAY IND INC
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