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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 po

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0025] The preparation method of hydrophilic anti-pollution reverse osmosis membrane is characterized by comprising the following steps:

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

[0027] ②Surface grafting reaction, the polyamide composite layer in step ① is treated in an acid solution with a pH of 1 to 3, taken out and rinsed, and then treated with C solution and D solution in sequence to complete the surface grafting reaction, the acid solution It is 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, and its weight concentration in th...

Example Embodiment

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

[0033] The preparation of the A solution: use m-phenylenediamine: sodium lauryl sulfate: water according to the weight percentage of 2.5:0.5:97, and mix well to obtain the A solution.

[0034] The preparation of B solution: The weight ratio of trimesoyl chloride: naphtha is 1:1000, mixed to obtain B solution.

[0035] The preparation of C solution: The N-hydroxysulfosuccinimide sodium salt (Na-NHS): 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDC·HCl ): Pure water, mixed evenly according to the 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 solution A layer on the support layer, and then contact this support layer with solution B t...

Example Embodiment

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

[0040]The preparation of the A solution: use m-phenylenediamine: p-phenylenediamine: sodium dodecylbenzene sulfonate: water at a weight percentage of 2.0:0.5:0.5:97, and mix well to obtain a solution A.

[0041] The preparation of B solution: the same as in Example 1.

[0042] Preparation of C solution: Preparation of C solution: N-hydroxysulfosuccinimide sodium salt (Na-NHS): 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride Salt (EDC·HCl): pure water, mixed evenly according to the weight percentage of 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, the others are the same as in Example 1.

[0045] The contact angle was measured ...

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PUM

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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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