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Polyarylester composite nanofiltration membrane and preparation method thereof

A technology of composite nanofiltration membrane and polyarylate, which is applied in the field of composite membranes, can solve the problems of inability to use strong polar solvents and low flux of solvent-resistant nanofiltration membranes, so as to improve membrane permeation flux, non-polluting human body, Effect of Solvent Resistance and Separation Performance

Pending Publication Date: 2021-04-20
CHUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is that the existing solvent-resistant nanofiltration membrane has problems such as low flux and inability to be used in strong polar solvents.

Method used

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  • Polyarylester composite nanofiltration membrane and preparation method thereof

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preparation example Construction

[0036] figure 1 For the preparation process of the polyarylate composite nanofiltration membrane of the present invention, see figure 1 , specifically as follows: the first step, prepare polyimide casting solution: mix polyimide particles, silicon dioxide powder and organic solvent, and prepare polyimide with a mass concentration of 15% to 30%, two The mass concentration of silicon oxide is a mixed solution of 0.1% to 10%. Stir the mixed solution at 60°C for 4 to 10 hours. After standing and cooling, put it in a desiccator for degassing for 24 hours to make a polyimide casting film. Liquid; second step, prepare base film: polyimide film casting solution is poured on the non-woven fabric, utilizes scraper such as stainless steel scraper to evenly coat polyimide casting film solution on the non-woven fabric, the The non-woven fabric is fixed on the glass plate, and the distance between the knife edge of the stainless steel scraper and the non-woven fabric is controlled to be 15...

Embodiment 1

[0048] In order to solve the above-mentioned technical problems existing in the prior art, an embodiment of the present invention provides a method for preparing a polyarylate composite nanofiltration membrane.

[0049] The preparation process of the polyarylate composite nanofiltration membrane of this embodiment is carried out in a constant temperature box at 25 ° C. In this embodiment, cardanol is used as the aqueous phase monomer, and other conditions are the same as those of the comparative example, such as figure 1 As shown, the preparation method of the polyarylate composite nanofiltration membrane of the present embodiment specifically comprises the following steps:

[0050] One, the mass concentration of preparation polyimide P84 is 15%, and the mass concentration of silicon dioxide is 0.1% N,N-dimethylacetamide (DMAc) solution, stirs 4 hours in 60 ℃ of water baths, static After cooling, put it into a desiccator for degassing for 24 hours to obtain a casting solution....

Embodiment 2

[0059] The preparation process of the polyarylate composite nanofiltration membrane of the present embodiment is carried out in a constant temperature box at 25°C, as follows:

[0060] One, the mass concentration of preparation polyimide P84 is 15%, and the mass concentration of silicon dioxide is 1% N,N-dimethylacetamide (DMAc) solution, stirs 4 hours in 60 ℃ of water baths, static After cooling, put it into a desiccator for degassing for 8 hours to obtain a casting solution. The defoamed casting solution was evenly scraped on the non-woven fabric fixed on the glass plate with a stainless steel scraper, and the distance between the knife edge and the non-woven fabric was controlled to be 150 μm. Immediately put the scraped cast film liquid film into a gel bath of water at 25°C, take it out for refrigeration after 1 hour, put it into 0.1mol / L sodium hydroxide solution for treatment for 6 hours after cleaning, and refrigerate to obtain the base For the film, the side of the no...

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Abstract

The invention discloses a polyarylester composite nanofiltration membrane and a preparation method thereof. The method comprises the following steps: S100, providing a base membrane; S200, loading cardanol molecules on the surface of the base membrane to obtain a base membrane loaded with the cardanol molecules; S300, loading trimesoyl chloride on the surface of the base membrane loaded with the cardanol molecules; and S400, carrying out interfacial polymerization reaction on cardanol molecules on the base membrane treated in the step S300 and trimesoyl chloride to generate a polyarylester layer, thereby obtaining the polyarylester composite nanofiltration membrane. Cardanol is selected to replace a traditional water-phase monomer to be subjected to interfacial polymerization reaction with organic-phase trimesoyl chloride, so that the prepared solvent-resistant composite nanofiltration membrane has solvent resistance and high separation performance.

Description

technical field [0001] The invention relates to the technical field of composite membranes, in particular to a polyarylate composite nanofiltration membrane and a preparation method thereof. Background technique [0002] In recent years, membrane separation technology has developed rapidly as a new chemical separation unit operation. At present, most nanofiltration membranes are only suitable for aqueous solution systems, such as the widely used NF series nanofiltration membranes of American FilmTec Company and the UTC series commercial nanofiltration membranes of Toray Corporation of Japan. Superior separation performance, but in the organic system, due to the similar miscibility of the polymer and the organic system, the nanofiltration membrane swells or even dissolves, resulting in a decline in separation performance. Solvent-resistant nanofiltration membranes and nanofiltration technology have begun to receive more and more attention More and more people pay attention a...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D61/02B01D71/48B01D67/00B01D69/02
Inventor 周阿洋郑建东汪翠萍汤洋孙娜娜孙绘玉胡洁程明霞
Owner CHUZHOU UNIV
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