Preparation method of super-hydrophilic organic membrane based on surface covered with micro-nano structure

A technology of micro-nano structure and organic membrane, which is applied in the field of membrane separation, can solve the problems of rising operating costs and easy pollution of organic membranes, and achieve the effects of high-efficiency interception, excellent long-term anti-pollution performance, and high interception performance

Active Publication Date: 2018-05-18
BEIJING FORESTRY UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 micro-nano structure surface stamping, which is characterized in that it includes the following steps:

Method used

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  • Preparation method of super-hydrophilic organic membrane based on surface covered with micro-nano structure
  • Preparation method of super-hydrophilic organic membrane based on surface covered with micro-nano structure
  • Preparation method of super-hydrophilic organic membrane based on surface covered with micro-nano structure

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preparation example Construction

[0051] The present invention provides a method for preparing a super-hydrophilic organic film based on micro-nano structure imprinted on the surface. According to the embodiment of the present invention, the implementation flow chart is shown in figure 1 , including the following steps.

[0052] S100. Selection and pretreatment of micro-nano structured slices

[0053] According to an embodiment of the present invention, the sheet with a micro-nano structure on the surface includes, but is not limited to, a fine wire woven mesh and a polydimethylsiloxane with a complementary micro-nano structure on the surface prepared using the fine metal wire woven mesh as a template. The sheet is coated with a release agent with a thickness of no more than 0.1 micron on its surface, wherein the release agent is at least one of silicone compound, silicone oil, silicone grease, and surfactant.

[0054] S200. Preparation of organic film with micro-nano structure

[0055] Prepare a film castin...

Embodiment 1

[0061] 1. Selection and pretreatment of micro-nano structured slices

[0062] Select a fine metal wire braided mesh with a wire diameter of 0.8 microns as a template to prepare a polydimethylsiloxane sheet with a complementary micro-nano structure on the surface, and select chloromethyl dimethyl silicon chloride as a release agent for polydimethylsiloxane The surface of the siloxane flakes is coated with a coating thickness of 0.06 microns.

[0063] 2. Preparation of organic film with micro-nano structure

[0064] Based on the total mass of the casting solution, at room temperature (23 ± 2 degrees Celsius), fully dissolve 19wt% polyvinylidene fluoride and 0.5wt% polyvinylpyrrolidone in 80.5wt% N-methylpyrrolidone, and The resulting casting solution was allowed to stand for defoaming for 14 hours, then heated in a water bath at 50 degrees Celsius for 1 hour, and finally left to cool at room temperature. On the glass plate, use a scraper to make a layer of casting liquid film ...

Embodiment 2

[0071] 1. Selection and pretreatment of micro-nano structured slices

[0072] A fine metal wire braided mesh with a wire diameter of 0.8 microns is selected as a micro-nano structure sheet, and a surfactant is selected as a release agent to coat the surface of the sheet with a coating thickness of 0.06 microns.

[0073] 2. Preparation of organic film with micro-nano structure

[0074] Based on the total mass of the casting solution, at room temperature (23 ± 2 degrees Celsius), fully dissolve 19wt% polyvinylidene fluoride and 0.5wt% polyvinylpyrrolidone in 80.5wt% N-methylpyrrolidone, and The resulting casting solution was allowed to stand for defoaming for 14 hours, then heated in a water bath at 50 degrees Celsius for 1 hour, and finally left to cool at room temperature. On the glass plate, use a scraper to make a layer of casting liquid film with a thickness of 200 microns, place a cushion layer with a height of 180 microns around the liquid film, and then cover the select...

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Abstract

The invention provides a preparation method of a super-hydrophilic organic membrane. The method comprises the following steps: (1) providing a sheet with a micro-nano structure on the surface; (2) providing a membrane casting solution, and forming a membrane casting solution film on a glass plate; (3) arranging a cushion layer with adjustable height on the periphery of the membrane casting solution film; (4) covering the surface of the membrane casting solution film with the sheet with the micro-nano structure and supporting the sheet with the cushion layer; (5) placing the glass plate in a coagulation bath to form an organic membrane with a complementary micro-nano structure on the surface; (6) grafting a polymethylacrylic acid polymer to the micro-nano structured surface of the organic membrane through plasma induced graft polymerization to obtain a modified organic membrane; (7) soaking the modified organic membrane in a silica nanoparticle suspension with surface modified with a silane coupling agent. The organic membrane prepared with the method has a multi-level micro-nano structure, has the characteristics of being super-hydrophilic, high in flux, persistently anti-pollutionand the like and has good application prospect in the field of membrane-process water treatment.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a preparation method of a super-hydrophilic organic membrane based on micro-nano structure surface stamping. 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D71/36B01D71/42B01D71/68B01D71/30B01D71/10B01D69/02B01D67/00
CPCB01D67/0006B01D69/02B01D71/10B01D71/30B01D71/34B01D71/36B01D71/42B01D71/68B01D2325/36
Inventor 梁帅马智波张塽陈冠浩赵帆李敏
Owner BEIJING FORESTRY UNIVERSITY
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