Preparation method of forward osmosis membrane based on 3D printing technology

A technology of forward osmosis membrane and 3D printing, which is applied in the field of membrane technology and water treatment, can solve the problems of expensive raw materials, low cost performance and low feasibility, and achieve the effect of low price, stable raw materials and stable performance

Active Publication Date: 2019-04-19
TIANJIN UNIV
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  • Abstract
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Problems solved by technology

[0004] The patent with the publication number CN107235745A discloses "a sewage treatment ceramic membrane prepared by 3D printing technology and its preparation method". This method uses a computer to design a three-dimensional file of the membrane with regular apertures. The membrane aperture and thickness are uniform and controllable, but The raw material carbon fiber used is expensive, cost-effective and less feasible
[0005] The patent with the publication number C

Method used

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  • Preparation method of forward osmosis membrane based on 3D printing technology

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preparation example Construction

[0023] Such as figure 1 The method for preparing a forward osmosis membrane based on 3D printing technology proposed by the present invention includes the following steps:

[0024] (1) Preparation of polyvinyl chloride support layer, the specific process is:

[0025] (1a) Add polyvinyl alcohol and polyvinyl chloride with a mass ratio of 0.005g:1g~0.11g:1g to N-methylpyrrolidone, stir in a round-bottomed flask until polyvinyl alcohol, polyvinyl chloride and N-methyl Pyrrolidone is completely dissolved to form a uniform and stable solution, and the solid-to-liquid ratio of polyvinyl chloride to N-methylpyrrolidone is 0.16g:1mL~0.20g:1mL;

[0026] (1b) Place the above-mentioned uniform and stable solution at a temperature of 23~25℃ for deaeration, then transfer the solution to an automatic film coating machine to form a uniform film to obtain a polyvinyl chloride support layer, and store it in deionized water for later use;

[0027] (2) Preparation of composite membrane, the specific p...

Embodiment 1

[0032] To prepare a forward osmosis membrane based on 3D printing technology, the specific process is as follows:

[0033] (1) Preparation of polyvinyl chloride support layer, the specific process is:

[0034] (1a) Take 1g of polyvinyl chloride, add polyvinyl alcohol with a mass ratio of 0.005g:1g to polyvinyl chloride into N-methylpyrrolidone, and stir in a round bottom flask until polyvinyl alcohol, polyvinyl chloride and N— Methylpyrrolidone is completely dissolved to form a uniform and stable solution, and the solid-to-liquid ratio of polyvinyl chloride to N-methylpyrrolidone is 0.16g:1mL;

[0035] (1b) Place the above uniform and stable solution at room temperature 23°C and let it stand for deaeration, and then transfer the solution to an automatic film coating machine to form a uniform film to obtain a polyvinyl chloride support layer, and store it in deionized water for later use;

[0036] (2) Preparation of composite membrane, the specific process is:

[0037] (2a) Add m-phenyl...

Embodiment 2

[0044] To prepare a forward osmosis membrane based on 3D printing technology, the specific process is as follows:

[0045] (1) Preparation of polyvinyl chloride support layer, the specific process is:

[0046] (1a) Take 1g of polyvinyl chloride, add polyvinyl alcohol with a mass ratio of 0.058g:1g to polyvinyl chloride into N-methylpyrrolidone, and stir in a round bottom flask until polyvinyl alcohol, polyvinyl chloride and N- Methylpyrrolidone is completely dissolved to form a uniform and stable solution, and the solid-to-liquid ratio of polyvinyl chloride to N-methylpyrrolidone is 0.18g:1mL;

[0047] (1b) Place the above uniform and stable solution at room temperature 24°C and let it stand for deaeration, then transfer the solution to an automatic film coating machine to form a uniform film to obtain a polyvinyl chloride support layer, and store it in deionized water for later use;

[0048] (2) Preparation of composite membrane, the specific process is:

[0049] (2a) Add m-phenylened...

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Abstract

The invention discloses a preparation method of a forward osmosis membrane based on a 3D printing technology. The method comprises the following steps: (1) preparing a polyvinyl chloride supporting layer: mixing polyvinyl chloride, polyvinyl alcohol and N-methylpyrrolidone until the three substances are evenly stirred, standing the obtained mixture to defoam, uniformly forming a membrane by usinga membrane coating machine, and storing the membrane in deionized water for later use; and (2) preparing a polyvinyl chloride-polyamide composite membrane: preparing an n-hexane solution A containingtrimesoyl chloride and an aqueous solution B containing m-phenylenediamine, and sequentially depositing the solution B and the solution A on the polyvinyl chloride supporting layer by a 3D printer toobtain the composite membrane. The positive osmosis membrane prepared by the 3D printing technology has a controllable pore size and a controllable thickness; and the surface roughness of the membraneis reduced to about 2 nm from original about 80 nm (the surface roughness of membranes prepared through conventional interfacial polymerization methods), so the composite membrane is thin and smooth,thereby the water permeability and the salt rejection rate are greatly improved, good performances of the membrane are ensured, and the cost is reduced.

Description

Technical field [0001] The invention belongs to the field of membrane technology and water treatment technology, and specifically relates to a method for preparing a forward osmosis membrane based on 3D printing technology and its application in water treatment technology. Background technique [0002] Only 47.3% of the total precipitation in the country is converted into water resources, and most of the rest is consumed in evapotranspiration. In addition, my country's water resources have uneven distribution in time and space, rapid population growth, and water pollution, which have led to a shortage of water resources per capita in my country. [0003] Traditional water treatment technology is divided into thermal method and membrane method. Thermal method and membrane method based on distillation and adsorption have higher energy consumption. Membrane technology is divided into nanofiltration, ultrafiltration, reverse osmosis and forward osmosis. The technology has received wid...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D71/56B01D67/00B01D61/00
CPCB01D61/002B01D67/0002B01D69/12B01D71/56
Inventor 丁辉张思琦朱慧真
Owner TIANJIN UNIV
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