Preparation method of amphoteric polyelectrolyte complex surface-modified polyamide reverse osmosis membrane

A polyelectrolyte and surface modification technology is applied in the field of preparation of polyamide reverse osmosis membranes to achieve the effects of good hydrophilicity, good pollution resistance and improved hydrophilicity

Active Publication Date: 2014-09-10
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the complexity and diversity of practical application systems, it is necessary to further improve the desalination rate, water permeability and fouling resistance of reverse osmosis membranes.

Method used

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  • Preparation method of amphoteric polyelectrolyte complex surface-modified polyamide reverse osmosis membrane

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[0015] The preparation method of the polyamide reverse osmosis membrane modified on the surface of the amphoteric polyelectrolyte complex comprises the following steps:

[0016] (1) Dissolve 10-30 parts by mass of zwitterionic monomers and 5-10 parts by mass of cationic monomers in an aqueous solution of 50-200 parts by mass, blow nitrogen into it, and add 0.1-1 parts by mass of water-soluble initiator , at 40-60 o Polymerize at C for 6-12 hours, precipitate the polymer with acetone, and wash it several times to obtain an amphoteric cationic polymer, which is vacuum-dried for later use;

[0017] (2) Dissolve 1-3 parts by mass of sodium carboxymethylcellulose and 0.5-2 parts by mass of amphoteric cationic polymer in 100-500 parts by mass of acidic aqueous solution, and then add the acidic aqueous solution of amphoteric cationic polymer dropwise Carry out ionic cross-linking in the acidic aqueous solution of sodium carboxymethyl cellulose, after precipitation, wash with deioniz...

Embodiment 1

[0021] 10 g of 3-[N,N-dimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]ammonium]propane-1-sulfonic acid inner salt and 5 g of methacrylic acid Dissolve acyloxyethyltrimethylammonium chloride in 50 g of aqueous solution, pass through nitrogen, add 0.1 g of potassium persulfate and sodium bisulfite (mass ratio is 1:1), at 40 o C was polymerized for 12 hours, precipitated with acetone, washed several times, and dried in vacuum to obtain an amphoteric cationic polymer; 1 g of sodium carboxymethylcellulose and 0.5 g of amphoteric cationic polymer were dissolved in 100 g of 0.01wt% hydrochloric acid aqueous solution, then the amphoteric cationic polymer acidic aqueous solution is added dropwise in the sodium carboxymethyl cellulose acidic aqueous solution to carry out ion cross-linking, after precipitation, washed with deionized water several times, at 40 o C dried for 16 hours to obtain the amphoteric polyelectrolyte complex; then the above-mentioned 0.2 g complex was added to 100 g of a...

Embodiment 2

[0023] 30 g of 3-[N,N-dimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]ammonium]propane-1-sulfonic acid inner salt and 10 g of methacrylic acid Dissolve acyloxyethyltrimethylammonium chloride in 200 g of aqueous solution, pass through nitrogen, add 1 g of potassium persulfate and sodium bisulfite (mass ratio: 1:1), at 60 o C was polymerized for 6 hours, precipitated with acetone, washed several times, and vacuum-dried to obtain an amphoteric cationic polymer; 3 g of sodium carboxymethylcellulose and 2 g of amphoteric cationic polymer were dissolved in 500 g of 0.1wt% hydrochloric acid aqueous solution, and then the amphoteric cationic polymer acidic aqueous solution is added dropwise in the sodium carboxymethyl cellulose acidic aqueous solution to carry out ion cross-linking, after precipitation, washed with deionized water several times, at 60 o C dried for 8 hours to obtain the amphoteric polyelectrolyte complex; then the above-mentioned 2 g complex was added to 500 g concentratio...

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Abstract

The invention discloses a preparation method of an amphoteric polyelectrolyte complex surface-modified polyamide reverse osmosis membrane. The preparation method comprises the steps: firstly, preparing an amphoteric cationic polymer by a free radical polymerization method, then preparing an amphoteric polyelectrolyte complex by an ionic crosslinking method, dispersing the amphoteric polyelectrolyte complex in an aqueous phase solution, and thus obtaining the amphoteric polyelectrolyte complex surface-modified polyamide reverse osmosis membrane through surface secondary interface polymerization. With utilization of good hydrophilicity, contamination resistance and a unique nanoparticle structure of the amphoteric polyelectrolyte complex, the water permeation flux and contamination resistance of the membrane are improved while the high interception rate of the polyamide membrane on an inorganic salt is kept. Under an operating pressure of 1.5 MPa at the temperature of 25 DEG C, the interception rate of the reverse osmosis membrane on NaCl is more than 98%, the water flux is greater than 30 L.m<-2>.h<-1>. Therefore, the prepared amphoteric polyelectrolyte complex surface-modified polyamide reverse osmosis membrane has high desalination rate, water permeability and contamination resistance.

Description

technical field [0001] The invention belongs to the field of reverse osmosis membrane separation, and in particular relates to a preparation method of a polyamide reverse osmosis membrane modified on the surface of an amphoteric polyelectrolyte complex. Background technique [0002] Water is the source of life and one of the important resources to maintain sustainable development in the world today. However, compared with the rapid development of population and industry, the world's available water resources are very scarce. Membrane separation technology has the characteristics of high efficiency, energy saving, environmental protection, and wide application range, and has become an effective means of seawater desalination and sewage treatment. Common membrane separation technologies include microfiltration, ultrafiltration, nanofiltration, reverse osmosis, pervaporation, and membrane bioreactors. Among them, reverse osmosis, as one of the earliest industrialized membrane...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D71/82B01D71/68B01D67/00B01D69/10C08F220/38C08F220/34C08F226/06C08F4/40
Inventor 计艳丽安全福高从堦
Owner ZHEJIANG UNIV
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