Antipollution modifying method of compound reverse osmosis membrane

A reverse osmosis membrane and anti-pollution technology, which is applied in the preparation of polymer composite membranes and the field of anti-pollution modification of composite reverse osmosis membranes, can solve the problems of complex modification process and difficult dissolution of polyamide composite reverse osmosis membranes, and achieve Improve anti-pollution performance, reduce chemical cleaning frequency, and produce obvious effects

Active Publication Date: 2014-10-08
HANGZHOU TIAN CHUANG ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Previously, some researchers mentioned that polyamide composite reverse osmosis membranes were coated or cross-linked with polyvinyl alcohol (PVA) to improve their anti-pollution performance, but due to the difficulty of PVA dissolution and the need for higher temperature heat treatment, etc. , resulting in complex polyamide composite reverse osmosis membrane modification process, therefore, the development of a simple and effective composite reverse osmosis membrane anti-pollution modification process, to alleviate the easy pollution of polyamide composite reverse osmosis membrane, to expand the polyamide composite reverse osmosis membrane The scope of application of the permeable membrane is of great significance

Method used

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  • Antipollution modifying method of compound reverse osmosis membrane

Examples

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Comparison scheme
Effect test

Embodiment 1

[0019] The difference from Comparative Example 1 is that after the polyamide composite reverse osmosis membrane is obtained, anti-pollution modification is carried out on it, and the specific steps include:

[0020] (1) Preparation of A solution: Dissolve 0.2kg of acetic acid in 99.74kg of water, then add 0.01kg of chitosan and 0.05kg of sodium dodecylsulfonate to the aqueous solution, and stir until chitosan and surface activity A solution is obtained after the agent is completely dissolved;

[0021] (2) Preparation of solution B: add 0.05kg of sodium hydroxide to 99.95kg of water, stir and dissolve to obtain solution B;

[0022] (3) First, the surface of the polyamide composite reverse osmosis membrane is coated with solution A, and after removing excess solution A on the surface of the membrane, it is contacted with solution B to complete the anti-pollution modification of the composite reverse osmosis membrane.

[0023] Measure the water contact angle of 50°, and then tes...

Embodiment 2

[0025] The difference from Comparative Example 1 is that after the polyamide composite reverse osmosis membrane is obtained, anti-pollution modification is carried out on it, and the specific steps include:

[0026] (1) Preparation of solution A: Dissolve 0.2kg of acetic acid in 99.65kg of water, then add 0.1kg of chitosan and 0.05kg of sodium dodecylsulfonate to the aqueous solution, and stir until chitosan and surface activity A solution is obtained after the agent is completely dissolved;

[0027] (2) Preparation of solution B: add 0.05kg of sodium hydroxide to 99.95kg of water, stir and dissolve to obtain solution B;

[0028] (3) First, the surface of the polyamide composite reverse osmosis membrane is coated with solution A, and after removing excess solution A on the surface of the membrane, it is contacted with solution B to complete the anti-pollution modification of the composite reverse osmosis membrane.

[0029] The water contact angle was measured to be 41°, and t...

Embodiment 3

[0031] The difference from Comparative Example 1 is that after the polyamide composite reverse osmosis membrane is obtained, anti-pollution modification is carried out on it, and the specific steps include:

[0032] (1) Preparation of A solution: Dissolve 0.2kg of acetic acid in 99.25kg of water, then add 0.5kg of chitosan and 0.05kg of sodium dodecylsulfonate to the aqueous solution, and stir until chitosan and surface activity A solution is obtained after the agent is completely dissolved;

[0033] (2) Preparation of solution B: add 0.05kg of sodium hydroxide to 99.95kg of water, stir and dissolve to obtain solution B;

[0034] (3) First, the surface of the polyamide composite reverse osmosis membrane is coated with solution A, and after removing excess solution A on the surface of the membrane, it is contacted with solution B to complete the anti-pollution modification of the composite reverse osmosis membrane.

[0035] Measure the water contact angle of 40°, and then test...

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Abstract

The invention discloses a preparation method of a macromolecular compound membrane, and particularly relates to an antipollution modifying method of a compound reverse osmosis membrane. The antipollution modifying method comprises the following steps: (1), dissolving acid in water, adding a defined amount of chitosan and surfactant, stirring until the chitosan and the surfactant are fully dissolved to obtain a solution A; (2), dissolving an alkaline substance in water, and stirring and dissolving to obtain a solution B; and (3), coating the surface of a polyamide compound reverse osmosis membrane by the solution A, enabling the membrane to be in contact with the solution B after redundant solution A on the surface of the membrane is removed to complete the antipollution modification of the compound reverse osmosis membrane. The antipollution modifying method has the advantages that two hydrophilic groups -NH2 and -OH are carried on the surface of the membrane modified by using the antipollution modifying method, so that good hydrophilic performance and antipollution performance are achieved; and meanwhile, the chitosan is dissolved in an acidic solution without being heated, thus the antipollution modifying method is easy to operate. Therefore, the antipollution modifying method has a remarkable competitive advantage on membrane modifying operation and production cost.

Description

technical field [0001] The invention relates to a preparation method of a polymer composite membrane, specifically an anti-pollution modification method of a composite reverse osmosis membrane, which belongs to the technical field of membrane surface modification, and the surface hydrophilicity of the modified composite reverse osmosis membrane increases , the antifouling performance of the membrane is improved. Background technique [0002] At present, reverse osmosis membrane separation technology has separation characteristics such as high efficiency, low energy consumption, and high selectivity, and has been widely used in seawater desalination, separation and concentration, drinking water purification, and waste water recycling. Among them, the polyamide composite reverse osmosis membrane has the advantages of high salt rejection rate, large flux, excellent chemical stability, and wide pH range, and has become the mainstream product in the field of reverse osmosis. How...

Claims

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Application Information

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IPC IPC(8): B01D71/56B01D69/12B01D67/00
Inventor 王炎锋吕振华徐淑宏谢柏明赵经纬张茜
Owner HANGZHOU TIAN CHUANG ENVIRONMENTAL TECH
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