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Chlorine-resistant and pollution-resistant polyamide reverse osmosis composite membrane and preparation method thereof

A reverse osmosis composite membrane and reverse osmosis membrane technology are applied in the field of chlorine-resistant and pollution-resistant polyamide reverse osmosis composite membrane and the preparation field of the above-mentioned polyamide reverse osmosis composite membrane, which can solve problems such as immature technical solutions and avoid easy flushing. The effect of drop, improved contamination resistance, and simple operation method

Pending Publication Date: 2021-10-22
WANHUA CHEM GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Although some technical solutions for simultaneously improving the chlorine resistance and pollution resistance of polyamide reverse osmosis membranes have been formed in the prior art, there is still room for further improvement in the technical solutions.

Method used

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  • Chlorine-resistant and pollution-resistant polyamide reverse osmosis composite membrane and preparation method thereof
  • Chlorine-resistant and pollution-resistant polyamide reverse osmosis composite membrane and preparation method thereof
  • Chlorine-resistant and pollution-resistant polyamide reverse osmosis composite membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Preparation method of chlorine-resistant and pollution-resistant polyamide reverse osmosis composite membrane

[0068] Preparation of 3-(trimethoxysilane) propyl acrylate-copolyethylene glycol methyl ether methacrylate copolymer: 3-(trimethoxysilane) propyl acrylate and polyethylene glycol methyl ether Methacrylate (weight-average molecular weight 300) is added to a mixed solvent of tetrahydrofuran and chloroform with a volume ratio of 1:1 according to the molar ratio of 1:2, and then the initiator azobisisobutyronitrile of 1 wt% of the total monomer weight is added , and then reacted at 75°C for 24h under nitrogen atmosphere. After the reaction was completed, n-hexane was used as a precipitating agent to obtain 3-(trimethoxysilane)propyl acrylate-co-polyethylene glycol methyl ether methacrylic acid by co-precipitation method Ester copolymer (weight-average molecular weight: 50,000-60,000), and dried under vacuum at 40°C for 24 hours to obtain copolymer powder. The NMR...

Embodiment 2

[0072] Preparation of chlorine-resistant and pollution-resistant polyamide reverse osmosis composite membrane: except that the concentration of 3-(trimethoxysilane) propyl acrylate-co-polyethylene glycol methyl ether methacrylate copolymer is formulated as 500ppm, In the same manner as in Example 1, a chlorine-resistant and pollution-resistant polyamide reverse osmosis composite membrane was prepared.

[0073] The obtained chlorine-resistant and pollution-resistant polyamide reverse osmosis composite membrane has an initial desalination rate of 99.7% and a permeation flux of 34.6L / m 2 / h, after evaluating the chlorine resistance of sodium hypochlorite solution, the desalination rate is 99.3%, and the permeation flux is 36.7L / m 2 / h, the rate of decrease of water flux after pollution is 10%.

Embodiment 3

[0075] Preparation of chlorine-resistant and pollution-resistant polyamide reverse osmosis composite membrane: except that the concentration of the ethanol solution of 3-(trimethoxysilane) propyl acrylate-co-polyethylene glycol methyl ether methacrylate copolymer is prepared as 1000ppm In addition, the same manner as in Example 1 was carried out to prepare a chlorine-resistant and pollution-resistant polyamide reverse osmosis composite membrane.

[0076] The obtained chlorine-resistant and pollution-resistant polyamide reverse osmosis composite membrane has an initial desalination rate of 99.7% and a permeation flux of 34.1L / m 2 / h, after evaluating the chlorine resistance of sodium hypochlorite solution, the desalination rate is 99.5%, and the permeation flux is 36.3L / m 2 / h, the rate of decrease in water flux after pollution is 6%.

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Abstract

The invention provides a chlorine-resistant and pollution-resistant polyamide reverse osmosis composite membrane and a preparation method thereof. The chlorine-resistant and pollution-resistant polyamide reverse osmosis composite membrane comprises: a base membrane; a polyamide reverse osmosis membrane formed on the base membrane; and a protective layer formed on the polyamide reverse osmosis membrane. The protective layer is formed by a 3-(trimethoxysilane) propyl acrylate-co-polyethylene glycol methyl ether methacrylate copolymer and is deposited on the surface of the polyamide reverse osmosis membrane through a chemical grafting reaction, and in the protective layer, the 3-(trimethoxysilane) propyl acrylate-co-polyethylene glycol methyl ether methacrylate copolymer forms a three-dimensional polymer network structure.

Description

technical field [0001] The invention belongs to the technical field of reverse osmosis, and in particular relates to a chlorine-resistant and pollution-resistant polyamide reverse osmosis composite membrane, and also relates to a preparation method of the polyamide reverse osmosis composite membrane. Background technique [0002] Reverse osmosis is a clean technology that uses physical separation methods to achieve water purification. Polyamide reverse osmosis composite membrane has a high ion rejection rate and excellent water production efficiency, and is widely used in the fields of reclaimed water reuse, seawater desalination, and brackish water desalination. [0003] In the practical application of reverse osmosis membranes, membrane fouling and membrane oxidation are the two main problems faced by reverse osmosis membranes. The direct consequence is the reduction of membrane performance, including membrane service life, rejection rate and water permeability. Membrane ...

Claims

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Application Information

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IPC IPC(8): B01D71/64B01D69/12B01D69/02B01D67/00B01D61/02
CPCB01D71/64B01D69/12B01D69/02B01D67/0006B01D61/025B01D2325/30B01D2325/36Y02A20/131
Inventor 唐文勇倪凡沈慧芳刘相宝赵伟国孙家宽
Owner WANHUA CHEM GRP CO LTD
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