A preparation method of superhydrophilic organic membrane based on micro-nano substrate

An organic membrane and super-hydrophilic technology, applied in the field of membrane separation, can solve the problems of rising operating costs and easy fouling of organic membranes, and achieve the effects of efficient interception, excellent long-term anti-pollution performance, and high interception performance.

Active Publication Date: 2021-04-13
BEIJING FORESTRY UNIVERSITY
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Problems solved by technology

[0005] The invention aims to solve the problem that the organic membrane is easily polluted in the existing membrane separation technology, which leads to increased operating costs, etc., and realizes the organic membrane through the ingenious fusion of the micro-nano structure construction technology on the membrane surface and the self-assembly grafting technology of nanomaterials. The superhydrophilic modification of the surface provides a method for preparing a superhydrophilic organic film based on a micro-nano substrate, which is characterized in that it includes the following steps:

Method used

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  • A preparation method of superhydrophilic organic membrane based on micro-nano substrate
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preparation example Construction

[0048] The present invention provides a method for preparing a super-hydrophilic organic film based on a micro-nano substrate. According to an embodiment of the present invention, the implementation flow chart is shown in figure 1 , including the following steps.

[0049] S100. Selection and pretreatment of micro-nano substrates

[0050] According to an embodiment of the present invention, the substrate with a micro-nano surface structure includes, but is not limited to, a micro-wire braided mesh and a polydimethylsiloxane with a complementary micro-nano structure on the surface prepared using the fine metal wire braided mesh as a template. Flat plate, fix the micro-nano substrate on a glass plate, and coat a release agent with a thickness of no more than 0.1 micron on it.

[0051] S200. Preparation of organic film with micro-nano structure

[0052] Prepare a film casting solution, fully dissolve a certain amount of organic film materials and additives in an organic solvent,...

Embodiment 1

[0058] 1. Selection and pretreatment of micro-nano substrates

[0059] Select a stainless steel wire mesh with a wire diameter of 0.8 microns as a template to prepare a polydimethylsiloxane plate with a complementary micro-nano structure on the surface, and use chloromethyldimethylsilyl chloride as a release agent for polydimethylsiloxane The surface of the oxane flat plate is coated with a coating thickness of 0.06 microns.

[0060] 2. Preparation of organic film with micro-nano structure

[0061] Based on the total mass of the casting solution, at room temperature, 17wt% of polyvinylidene fluoride and 0.01wt% of polyvinylpyrrolidone were fully dissolved in 82.99wt% of N-methylpyrrolidone, and the resulting casting solution was left standing to remove Soak for 12 hours, then heat in a water bath at 50 degrees Celsius for 1 hour, and finally let it cool at room temperature for 8 hours. On the polydimethylsiloxane plate coated with chloromethyldimethylsilyl chloride, use a sc...

Embodiment 2

[0068] 1. Selection and pretreatment of micro-nano substrates

[0069] A stainless steel wire mesh with a wire diameter of 0.8 microns is selected as the substrate, and the surface is coated with silicone oil as a release agent, and the coating thickness is 0.1 microns.

[0070] 2. Preparation of organic film with micro-nano structure

[0071] Based on the total mass of the required configuration casting solution, at room temperature (23 ± 2 degrees Celsius), 12wt% polyvinyl chloride and 5wt% polyvinylpyrrolidone were fully dissolved in 83wt% N-methylpyrrolidone, and the resulting The casting solution was allowed to stand for defoaming for 12 hours, heated in a water bath at 50°C for 1 hour, and then left to cool at room temperature for 2 hours. On the stainless steel screen coated with silicone oil, use a scraper to form a layer of casting liquid film with a thickness of 400 microns, place it in the air for 30 seconds, and then immerse it in pure water. After 15 minutes, the...

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Abstract

The invention provides a kind of preparation method of superhydrophilic organic film, and this method comprises: (1) provide the substrate with micro-nano surface structure, be fixed on smooth plate, and release agent is coated on substrate surface; (2) ) providing the casting solution, casting it on the surface of the substrate, and standing to form a layer of casting solution liquid film; (3) placing the flat plate with the casting solution liquid film and the substrate in the gel bath to form An organic film with a complementary micro-nano structure on the surface; (4) grafting polymethacrylic acid polymers on the surface of the complementary micro-nano structure of the organic film by plasma-induced graft polymerization to obtain a modified organic film; (5) The modified organic membrane is soaked in the suspension of silicon dioxide nanoparticles with amino functional groups whose surface is modified by a silane coupling agent. The surface of the organic membrane prepared by the invention has a multi-level micro-nano structure, has super-hydrophilic, high-flux, and durable anti-pollution characteristics, and has good application prospects in the field of membrane water treatment.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a method for preparing a super-hydrophilic organic membrane based on a micro-nano substrate. Background technique [0002] Water pollution and water shortage are one of the most severe existential crises faced by human beings. Sewage recycling is an important strategy to alleviate worldwide water environmental problems. Membrane water treatment technology is one of the mainstream technologies for sewage reuse in the 21st century due to its advantages of good effluent quality, high treatment efficiency and small footprint. Membrane water treatment technologies usually include microfiltration, ultrafiltration, nanofiltration, reverse osmosis, and forward osmosis, etc. Among them, ultrafiltration technology can effectively remove suspended solids, colloids, and pathogenic microorganisms in water, and the operating cost is significantly lower than that of nan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/82B01D69/02B01D67/00
CPCB01D67/0002B01D69/02B01D71/82B01D2325/36
Inventor 梁帅马智波赵帆张塽陈冠浩李敏
Owner BEIJING FORESTRY UNIVERSITY
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