Method for modifying polyamide composite thin film

A composite film and polyamide technology, which is applied in the field of post-treatment modified polyamide composite film, can solve the problems of reduced membrane effluent flux, increased membrane cleaning frequency, increased operating costs, etc., to achieve simple operation and reduce membrane pollution , the effect of great controllability

Inactive Publication Date: 2017-07-04
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing polyamide TFC membrane is prone to biofouling, resulting in reduced membrane effluent flux, increased membrane cleaning frequency, increased energy consumption, shortened membrane life cycle, thereby reducing process efficiency and increasing operating costs. , and provide a method for modifying polyamide composite film

Method used

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  • Method for modifying polyamide composite thin film
  • Method for modifying polyamide composite thin film

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Experimental program
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specific Embodiment approach 1

[0025] Specific embodiment one: the method for the modified polyamide composite film of this embodiment is carried out according to the following steps:

[0026] 1. Coupling dopamine and initiator: dissolving dopamine hydrochloride in dimethylformamide, then adding 2-bromoisobutyryl bromide and triethylamine under the protection of dryness and nitrogen and stirring to react to obtain the initiator dopamine coupling solution;

[0027] 2. Introduction of the initiator on the surface of the membrane: Tris buffer solution is added to the initiator dopamine coupling solution to obtain a mixed solution, and then the active layer on the surface of the polyamide TFC membrane is reacted with the mixed solution, and the active layer Initiator is grafted to form polymerized dopamine;

[0028] 3. Graft zwitterionic polymers on the surface of the membrane: Dissolve the zwitterionic monomers in isopropanol aqueous solution, pass nitrogen gas for 10 minutes, add copper chloride catalytic com...

specific Embodiment approach 2

[0032] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the dopamine hydrochloride described in step one is 800 mg, the volume of dimethylformamide is 40 mL, the volume of 2-bromoisobutyryl bromide is 0.26 mL, and the volume of triethyl bromide is 0.26 mL. The amine volume was 0.3 mL. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0033] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that the quality of the zwitterionic monomer described in step three is 15.64g, and the volume of isopropanol aqueous solution with a mass concentration of 50% is 200mL. The volume of the copper chloride catalytic complex is 20 mL, and the volume of the ascorbic acid solution is 12 mL. Others are the same as those in the first or second embodiment.

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Abstract

The invention relates to a method for modifying a polyamide composite thin film, relates to a method for improving pollution resistance of a forward osmosis polyamide composite film through post-treatment modification, and is used for solving the problems that because a conventional polyamide TFC film easily gets biological pollution, the film effluent flux is decreased, the film cleaning frequency is increased, the energy consumption is increased, the film life cycle is shortened, then the process treatment efficiency is reduced and the operation cost is increased. The method comprises the steps: one, coupling dopamine and an initiator; two, introducing the initiator to the surface of a film; three, grafting a zwitterionic polymer on the surface of the film; four, adsorbing silver ions; and five, producing nano silver in situ. The obtained modified TFC film has anti-adhesion and bacteriostasis effects, and can effectively control the biological pollution of the film. The atom transfer radical polymerization reaction is adopted for grafting of the zwitterionic polymer, large controllability is achieved, the graft length and density of the organic polymer can be controlled by adjusting and controlling parameters, and the properties of pollution resistance and mass transfer of the film are further optimized.

Description

technical field [0001] The invention relates to a method for post-processing a modified polyamide composite film. Background technique [0002] With the rapid growth of the world's population and the rapid consumption of fossil fuels, water scarcity and energy crisis plague the world. And these two are closely related. Making water available is an energy-intensive process, and energy production often requires large amounts of water. Membrane filtration technology represented by microfiltration, ultrafiltration, nanofiltration, reverse osmosis and forward osmosis is one of the pillar technologies of environmental engineering, because of its advantages of energy saving, high efficiency, economy, simplicity and convenience, and no secondary pollution. , In water treatment, it has been widely used in brackish water desalination, seawater desalination, industrial water supply treatment, pure water and ultrapure water preparation, wastewater treatment, sewage reuse, etc. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/16C23C18/44C08L77/00
CPCC08J7/16C08J2377/00C23C18/1658C23C18/44
Inventor 马军刘彩虹宋丹
Owner HARBIN INST OF TECH
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