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Phase conversion pouring preparation process and forming device for inorganic porous ceramic tubular membrane

A ceramic membrane tube and inorganic porous technology are applied in the field of phase inversion casting preparation process and forming device of inorganic porous ceramic membrane tube to achieve the effects of simple preparation process and equipment, low energy consumption and simple equipment

Inactive Publication Date: 2015-06-17
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The application of the phase inversion method in the preparation of ceramic membrane tubes is a topic that has been studied by those skilled in the art. However, there are few reports on the existing literature on membrane preparation. Therefore, the inventors of this case combined the molding characteristics of ceramic membrane tubes with the phase inversion process. , low-cost preparation of ceramic membrane tubes, so the present invention proposes

Method used

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  • Phase conversion pouring preparation process and forming device for inorganic porous ceramic tubular membrane
  • Phase conversion pouring preparation process and forming device for inorganic porous ceramic tubular membrane
  • Phase conversion pouring preparation process and forming device for inorganic porous ceramic tubular membrane

Examples

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Comparison scheme
Effect test

Embodiment 1

[0039] Example 1: Please refer to Figure 1 to Figure 7 , Prepare casting liquid, weigh 40-70% ceramic powder, 4-8% polyethersulfone, 20-35% N-methylpyrrolidone and 0.5-1.5% polyvinylpyrrolidone according to the mass ratio, and mix by ball milling 24-48 hours to make a uniform casting film, the film casting liquid must have suitable viscosity, fluidity and solid content; a mixture of ceramic powder, polyethersulfone, polyvinylpyrrolidone and N-methylpyrrolidone The liquid is injected into the mold cavity 6 and sealed with a rubber stopper 5 or other sealing plugs; under the action of thrust, the piston 2 and the casting liquid 7 enter the solidification bath 8 together, and this process is accompanied by the initial solidification of the casting liquid; the piston 2 together with The casting liquid 7 is solidified in the solidification bath for 24-48 hours until it is completely solidified; the piston is taken out to obtain the required ceramic membrane tube blank, and then it ...

Embodiment example 2

[0043] Implementation case 2: Preparation of asymmetric pore gradient tubular membrane

[0044] Configure the casting solution: weigh polyethersulfone (PESF) and polyvinylpyrrolidone (PVP) into the N-methylpyrrolidone (NMP) solution, and mix for half an hour to obtain a uniform solution; add the ceramic powder to the above solution in batches. During this period, it is ball-milled on a planetary ball mill at a speed of 300 rpm; finally, the material liquid containing ceramic powder is ball-milled for 48 hours to obtain a casting liquid with the desired viscosity. The above-mentioned film casting liquid was operated according to the process of Example 1. It is required to control the thickness of the forming mold cavity to be less than 2mm to obtain a ceramic film tube blank, and then obtain the following high temperature sintering process. image 3 The ceramic membrane tube of the structure shown, of which image 3 The example on the left side of the middle and left side shows the...

Embodiment example 3

[0045] Implementation case 3: Preparation of ceramic membrane tube with symmetric pore structure

[0046] Configure the casting solution: weigh polyethersulfone (PESF) and polyvinylpyrrolidone (PVP) into N-methylpyrrolidone (NMP) solution, and mix for half an hour to obtain a uniform solution; combine the ceramic powder (or ceramic powder with the Pore ​​agent) was added to the above solution in batches, and finally a small amount of flocculant, such as water, was added to the casting liquid. During this period, it was ball milled on a planetary ball mill at a speed of 300 rpm; finally, the material liquid was ball milled for 48 hours to obtain the desired For the casting liquid, the viscosity of the casting liquid is required to be higher than that of the asymmetric gradient tube casting liquid. Operate the above-mentioned film casting liquid according to the process of Example 1 to obtain the ceramic film tube body, and then obtain the following high temperature sintering proce...

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Abstract

The invention discloses a phase conversion pouring preparation process and a forming device for an inorganic porous ceramic tubular membrane. The preparation process comprises the steps of preparing a ceramic casting solution, forming a film in a phase conversion manner and completely solidifying the film. Ceramic powder, N-methyl-2-pyrrolidinone, polyvinylpyrrolidone and polyether sulfone are uniformly mixed to obtain the casting solution according to a given ratio; then the casting solution is defoamed and then injected into the forming device, and the demolding and formation can be realized in a solidification bath; finally the film is completely solidified in the solidification bath to obtain a ceramic film green body. The process has the characteristic that the phase conversion process is combined with a pouring forming process to realize the preparation of a ceramic film tube. Compared with a traditional extrusion forming and pouring process, the process is low in cost, easy to operate and capable of meeting the requirements for preparing a porous tube, an asymmetric hole gradient structural tube, a specially-shaped tube or a multichannel tube.

Description

Technical field [0001] The invention discloses an inorganic porous ceramic membrane tube phase inversion pouring preparation process and a forming device, which belong to the technical field of ceramic membrane tube manufacturing according to the International Patent Classification Table (IPC). Background technique [0002] As a new type of separation medium, inorganic ceramic separation membrane has many advantages that organic separation membranes cannot match, such as good thermal stability, high temperature resistance; good chemical stability, acid and alkali resistance, anti-microbial corrosion; narrow membrane pore size , Controllable microstructure, high separation efficiency; high mechanical strength, long service life, easy washing and other advantages. Ceramic membranes based on the above characteristics are widely used in food engineering, chemical engineering, environmental engineering, petrochemical and metallurgical engineering and other fields. [0003] There are th...

Claims

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Application Information

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IPC IPC(8): B01D71/02B01D69/04B01D67/00
Inventor 朱志文董应超冯绪勇肖进
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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