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Method for preparing hydrophilic anti-pollution reverse osmosis membrane

A reverse osmosis membrane, anti-pollution technology, applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems of polyamide membrane without chemical bonding, PVA cross-linked membrane instability, etc., to achieve anti-pollution performance Effect of improving and improving hydrophilicity and prolonging service life

Active Publication Date: 2009-05-27
NINGBO HIDROTEK CO LTD
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AI Technical Summary

Problems solved by technology

[0005] Another example is that the application number is 200610051205.8 in China's invention application publication "The Production Method of Low-Pollution Composite Reverse Osmosis Membrane" (publication number: CN1923348A), which discloses a method of cross-linking PVA with polyaldehyde or polyanhydride utilizing aldol condensation reaction. method, but the aldol condensation itself is a reversible reaction, and it is not chemically bonded to the polyamide film of the substrate, and the resulting PVA crosslinked film will still be unstable during use.

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0025] The preparation method of hydrophilic anti-fouling reverse osmosis membrane is characterized in that it comprises the following steps:

[0026] ①Interfacial polymerization reaction, coating solution A on the support layer, forming a solution layer A on the surface, and interfacial polymerization reaction between the support layer with the solution A layer and the solution B to form a polyamide composite layer;

[0027] ② surface grafting reaction, the polyamide composite layer in step ① is treated in an acid solution with a pH value of 1 to 3, rinsed after taking it out, and then sequentially treated with solution C and solution D to complete the surface grafting reaction, the acid solution One of hydrochloric acid, sulfuric acid or phosphoric acid,

[0028] The configuration of the A solution: dissolve in water with at least one functional amine selected from aromatic, aliphatic and cycloaliphatic, the functional amine has at least two amine functional groups, its weig...

Embodiment 1

[0032] Embodiment 1, the production method of reverse osmosis membrane comprises the following steps:

[0033] Preparation of solution A: use m-phenylenediamine: sodium lauryl sulfate: water at a weight percentage of 2.5:0.5:97, and mix well to obtain solution A.

[0034] Preparation of solution B: Mix trimesoyl chloride: naphtha at a weight ratio of 1:1000 to obtain solution B.

[0035] Preparation of solution C: N-hydroxysulfosuccinimide sodium salt (Na-NHS): 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDC·HCl ): pure water, mixed evenly according to weight percentage 1.8:1:97.2.

[0036] Preparation of solution D: Dissolve polyethylene glycol (PEG) with an average molecular weight of 200 (n=200) in water to prepare a solution with a weight concentration of 1%.

[0037] Coat solution A on the polysulfone support layer to form a layer of solution A on the support layer, and then contact this support layer with solution B to form a polyamide composite skin l...

Embodiment 2

[0039] Embodiment 2, the production method of reverse osmosis membrane comprises the following steps:

[0040]Preparation of solution A: use m-phenylenediamine: p-phenylenediamine: sodium dodecylbenzenesulfonate: water in a weight percentage of 2.0:0.5:0.5:97, and mix well to obtain A solution.

[0041] The preparation of B solution: with embodiment 1.

[0042] Preparation of solution C: Preparation of solution C: N-hydroxysulfosuccinimide sodium salt (Na-NHS): 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride Salt (EDC·HCl): pure water, mixed evenly according to weight percentage 2.5:1.0:96.5.

[0043] Preparation of solution D: Dissolve polyethylene glycol (PEG) with an average molecular weight of 800 (n=800) in water to prepare a solution with a weight concentration of 1%.

[0044] In the remaining steps, except that the treatment time by D solution is 20 minutes, other is the same as embodiment 1.

[0045] Its contact angle was measured to be 21.6°, and the hy...

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Abstract

The invention discloses a preparation method of a hydrophilic pollution-resistant reverse osmosis membrane which is characterized in that a daiamid layer is compounded on a supporting layer by an interface polyreaction at first; then reaction occurs on the daiamid layer to generate a crosslinking layer by the surface grafting reaction. Compared with the prior art, the preparation method has the advantages that N-hydroxy thio succinimide sodium salt or N-hydroxy thio succinimide is adopted as the active ester of a midbody for grafting a -(CH2CH2O)n- macromolecular hydrophilic chain on a polyamide cortex; moreover, the -(CH2CH2O)n- is combined with the polyamide membrane of a base by a chemical bond, thus improving the hydrophilicity of a compound reverse osmosis membrane, increasing the water flux thereof and improving the pollution resistance thereof, thereby prolonging the service life of the membrane.

Description

technical field [0001] The invention relates to a method for preparing a reverse osmosis membrane, in particular to a method for preparing a polyamide composite skin layer reverse osmosis membrane. The polyamide composite skin layer is modified so that the reverse osmosis membrane has the advantage of being hydrophilic and anti-pollution. Background technique [0002] Reverse osmosis technology is widely used in the field of water treatment technology. It can remove impurities such as inorganic ions, bacteria, virus organic matter, colloids, etc., and purify water quality. However, a difficulty in the application of reverse osmosis membranes that limits its further wide application is that pollutants are on the membrane surface and The flux attenuation caused by adsorption in the membrane pores and the reduction of membrane separation ability, especially the non-specific adsorption of proteins are the main reasons for the attenuation of membrane flux. Therefore, the developme...

Claims

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Application Information

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IPC IPC(8): B01D71/82B01D71/56B01D69/12
Inventor 顾逞涛乌学东
Owner NINGBO HIDROTEK CO LTD
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