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Three-dimensionally printed super-hydrophilic and underwater super-oleophobic mesh membrane and preparation method thereof

An underwater superoleophobic, three-dimensional printing technology, applied in separation methods, chemical instruments and methods, membranes, etc., can solve the problems of destroying the structure, reducing the mechanical strength of materials, etc., to achieve improved strength, high oil-water separation efficiency, and preparation methods. simple effect

Active Publication Date: 2019-10-25
TIANJIN UNIV
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent CN106182770A discloses a method for preparing a hydrophobic or super-hydrophobic membrane with controllable morphology by a three-dimensional printing template method. The method uses three-dimensional printing technology to design templates with different pore shapes, and according to the template, a protruding structure is formed. Hydrophobic or super-repellent membranes, Koh et al. first prepared cellulose acetate solution ink into a cellulose acetate omentum with a grid structure by three-dimensional printing technology, and then removed the solvent in the omentum by high-temperature curing, and finally the The omentum was immersed in a strong alkali solution to obtain a superhydrophilic and underwater superoleophobic cellulose omentum, which has good oil-water separation efficiency and oil pollution resistance (Koh J J, Lim Jia Hao G, Zhou X, et al.3D-Printed Anti-Fouling Cellulose Mesh for Highly Efficient Oil / WaterSeparation Applications[J].ACS Appl.Mater.Interfaces2019,11,13787-13795.), but the alkali in the preparation method The treatment will destroy the structure of the material and reduce the mechanical strength of the material; the above disclosed patents prove that 3D printing technology has high application value in the field of membrane separation material manufacturing for water treatment

Method used

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  • Three-dimensionally printed super-hydrophilic and underwater super-oleophobic mesh membrane and preparation method thereof

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Embodiment 1

[0026] A three-dimensionally printed superhydrophilic and underwater superoleophobic membrane and a preparation method thereof, the steps are as follows:

[0027] (1) Preparation of printing ink: 25wt% of inorganic nano-silica particles with a particle size of 100nm, 10wt% of polyvinyl alcohol with a molecular weight of 10,000, 10wt% of cellulose acetate with a molecular weight of 50,000, and the rest as tetrahydrofuran solvent, mix well , to remove the air bubbles in the ink by centrifugation;

[0028] (2) Three-dimensional printing omentum process: use three-dimensional direct writing printing technology to draw the prepared printing ink on the substrate according to the periodic cross network structure to form an omentum with a grid size of 50 μm;

[0029] (3) The curing process of the omentum: put the printed omentum into the water coagulation bath for curing, the curing time is 10 minutes, the curing temperature is 50 ° C, and finally put it in water for storage, that is,...

Embodiment 2

[0035] A three-dimensionally printed superhydrophilic and underwater superoleophobic membrane and a preparation method thereof, the steps are as follows:

[0036] (1) Preparation of printing ink: the particle size of each component is 5wt% of inorganic nano-silver particles of 10nm, the molecular weight is 100000 polyvinyl alcohol 30wt%, the molecular weight is 10000 cellulose acetate 15wt%, the rest is acetone solvent, mix uniformly, pass Centrifugation to remove air bubbles in the ink;

[0037](2) Three-dimensional printing omentum process: use three-dimensional direct writing printing technology to draw the prepared printing ink on the substrate according to the periodic cross network structure to form an omentum with a grid size of 500 μm;

[0038] (3) The curing process of the omentum: put the printed omentum into the ethanol coagulation bath for further curing, the curing time is 180min, the curing temperature is 10°C, and finally put it in water for storage, that is to ...

Embodiment 3

[0044] A three-dimensionally printed superhydrophilic and underwater superoleophobic membrane and a preparation method thereof, the steps are as follows:

[0045] (1) Preparation of printing ink: 15wt% of inorganic nano-alumina silver particles with a particle size of 55nm, 21wt% of polyvinyl alcohol with a molecular weight of 30,000, 30wt% of cellulose acetate with a molecular weight of 5,000, and the rest of dimethyl sulfoxide Solvent, mix well, and remove air bubbles in the ink by centrifugation;

[0046] (2) Three-dimensional printing omentum process: use three-dimensional direct writing printing technology to draw the prepared printing ink on the substrate according to the periodic cross network structure to form an omentum with a grid size of 250 μm;

[0047] (3) The curing process of the omentum: put the printed omentum into the methanol coagulation bath for further curing, the curing time is 120min, the curing temperature is 30°C, and finally put it in water for storag...

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Abstract

The invention discloses a three-dimensionally printed super-hydrophilic and underwater super-oleophobic mesh membrane and a preparation method thereof. The preparation method comprises the following steps: adding an inorganic nanoparticle, polyvinyl alcohol and cellulose acetate into an organic solvent according to a certain proportion and performing uniform mixing, then placing the prepared ink solution in a syringe, and then removing bubbles in the ink by centrifugation; drawing the prepared printing ink on a substrate by a three-dimensional ink direct writing printing technique to form a mesh membrane with a grid structure according to a periodic cyclic crisscross network structure; and putting the printed mesh membrane into a coagulation bath for further curing to finally obtain the mesh membrane with the grid structure and good mechanical properties. The mesh membrane prepared by the method has the grid structure, the size of the grid is 50-500 [mu]m, the mesh membrane has excellent super-hydrophilic and underwater super-oleophobic characteristics, and has extremely high separation efficiency for an oil-water mixture, and thus rapid separation of the oil-water mixture can be realized. The method has the advantages of simple preparation process, easy availability of raw materials, and being capable of carrying out large-scale production and application.

Description

technical field [0001] The invention specifically relates to a three-dimensionally printed superhydrophilic and underwater superoleophobic omentum and a preparation method thereof, belonging to the field of membrane material preparation. Background technique [0002] At present, due to the continuous increase of industrial oily wastewater and the frequent occurrence of oil spill accidents worldwide, a large amount of oily wastewater has been produced. If these wastewaters cannot be effectively treated, they will cause serious environmental and ecological problems. Separation technology has received extensive attention. At present, superhydrophilic and underwater superoleophobic porous membranes can selectively filter water while completely repelling oil pollutants; therefore, they have great potential in achieving high-efficiency oil-water separation, and are comparable to the current gravity Compared with traditional oil-water separation technologies such as conventional s...

Claims

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Application Information

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IPC IPC(8): B01D17/022B01D71/38B01D69/02B01D67/00C02F1/40
CPCB01D17/02B01D67/0002B01D69/02B01D71/38B01D2325/36C02F1/40
Inventor 李保安李希鹏
Owner TIANJIN UNIV
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