Method for preparing porous material with asymmetric structure

Abstract

The invention discloses a method for preparing a porous material with an asymmetric structure. The method comprises the steps: (1) fixing a porous support body in a closed deposition chamber by adopting a clamping device, enabling one side, to be deposited, of the porous support body to be communicated with a powder feeder located at one end of the deposition chamber, and enabling the other side of the porous support body to be communicated with a vacuum pump located at the other end of the deposition chamber; (2) adding powdery raw materials to be deposited into the powder feeder; (3) starting up the vacuum pump, opening the powder feeder, conveying the powdery raw materials in the powder feeder to the side, to be deposited, of the porous support body through gas, and depositing the powdery raw materials on the surface of the porous support body by using the pressure difference between the two sides of the porous support body; (4) closing the powder feeder, shutting down the vacuum pump, taking out and sintering, thereby obtaining the porous material with the asymmetric structure. According to the porous material with the asymmetric structure, prepared by the method, the filtration efficiency is much higher than that of the traditional porous materials, so that the porous material can be widely applied to industrial fields, such as petrochemical industry, biological pharmacy, food and beverage, water treatment and the like.

Description

Technical field [0001] The invention belongs to the technical field of porous material preparation, and specifically relates to a method for preparing a porous material with an asymmetric structure. Background technique [0002] Traditional powder metallurgy porous materials are all symmetrical structures, mainly including tubular and sheet-like elements. Most of the porous elements of this symmetrical structure are formed by cold isostatic pressing, extrusion or molding and then sintering. The filtration flux is large, but the filtration accuracy is low, which cannot meet the needs of filtration and chemical industries. [0003] In recent years, scholars at home and abroad have successfully prepared a layer of microporous membrane with small pore size and high filtration accuracy on the surface of the symmetrical structure support through wet spraying, sol-gel and centrifugal deposition. This structure is called It is an asymmetric porous material (a porous material with an asymm...

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Problems solved by technology

For porous materials, the main application at present is in the filtration and separation industry. The working conditions are complex and changeable. Most of the working conditions are high temperature, high pressure and corrosive atmosphere. The requirements for the mechanical properties and corrosion resistance of porous materials are relatively high. High, when the powder spraying method and centrifugal deposition method are used to prepare asymmetric porous materials, it is necessary to configure the powder slurry mainly composed of organic matter, and then achieve film deposition by centrifugal or spraying methods, and finally go through a specific sintering process Porous materials with asymmetric structure are obtained, but the organic matter is often not completely removed after sintering, resulting in a greatly increased content of elements such as carbon, oxygen, and nitrogen in the porous material, which seriously affects the mechanical properties and corrosion resistance of the porous material. Dust pollution will be formed during the process, which will cause serious harm to the environment and operators

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