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A kind of three-dimensional printing superhydrophilic and underwater superoleophobic omentum and preparation method thereof

An underwater super-oleophobic, three-dimensional printing technology, applied in separation methods, chemical instruments and methods, membranes, etc., can solve the problems of reducing the mechanical strength of materials, destroying structures, etc., and achieve high oil-water separation efficiency, increased strength, and excellent molding The effect of the characteristic

Active Publication Date: 2021-10-22
TIANJIN HYDROKING SCI & TECH
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  • Summary
  • Abstract
  • 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 alkaline 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, ZhouX, et al. 3D-Printed Anti-Fouling Cellulose Mesh for Highly Efficient Oil / Water Separation 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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  • A kind of three-dimensional printing superhydrophilic and underwater superoleophobic omentum and preparation method thereof

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Experimental program
Comparison scheme
Effect test

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: 25 wt% of inorganic nano-silica particles with a particle size of 100 nm, 10 wt% of polyvinyl alcohol with a molecular weight of 10,000, 10 wt% of cellulose acetate with a molecular weight of 50,000, and the rest as tetrahydrofuran solvent , mix evenly, and 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 a 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 ...

Embodiment 2

[0034] A three-dimensionally printed superhydrophilic and underwater superoleophobic membrane and a preparation method thereof, the steps are as follows:

[0035] (1) Preparation of printing ink: 5 wt% of inorganic nano-silver particles with a particle size of 10 nm, 30 wt% of polyvinyl alcohol with a molecular weight of 100,000, 15 wt% of cellulose acetate with a molecular weight of 10,000, and the rest as acetone solvent, Mix well and remove the air bubbles in the ink by centrifugation;

[0036](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;

[0037] (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

[0043] A three-dimensionally printed superhydrophilic and underwater superoleophobic membrane and a preparation method thereof, the steps are as follows:

[0044] (1) Preparation of printing ink: 15 wt% of inorganic nano-alumina particles with a particle size of 55 nm, 21 wt% of polyvinyl alcohol with a molecular weight of 30000, 30 wt% of cellulose acetate with a molecular weight of 5000, and the rest of dimethyl sulfoxide-based solvent, mix evenly, and remove the air bubbles in the ink by centrifugation;

[0045] (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;

[0046] (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...

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Abstract

The invention discloses a three-dimensionally printed superhydrophilic and underwater superoleophobic omentum and a preparation method thereof. Inorganic nanoparticles, polyvinyl alcohol and cellulose acetate are added to an organic solvent in a certain proportion and mixed evenly, and then the Prepare the ink solution and put it in the syringe, and then remove the air bubbles in the ink by centrifugation; use the three-dimensional ink direct writing printing technology to draw the prepared printing ink on the substrate according to the periodic cross network structure into a network with a grid structure Membrane; put the printed omentum into the coagulation bath for further curing, and finally obtain an omentum with a grid structure and good mechanical properties. The omentum prepared by the present invention has a grid structure, and the size of the grid is 50-500 μm. It also has excellent super-hydrophilic and underwater super-oleophobic properties. It has a very high separation efficiency for oil-water mixtures, and can realize Rapid separation of oil-water mixture, and the method has the advantages of simple preparation process, easy-to-obtain raw materials, and 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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Patent Type & Authority Patents(China)
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 HYDROKING SCI & TECH
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