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Preparation method of porous film

A porous film and porous support technology, which is applied in chemical instruments and methods, membranes, membrane technology, etc., can solve the problems of material cracking and deformation, large pore size of porous film materials, and difficulty in meeting the high requirements of porous film porosity, and achieve Increased porosity and good thermal stability

Active Publication Date: 2019-11-01
CHENGDU INTERMENT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The applicant of the present application has further tested and analyzed the above application and found that in order to avoid material cracking and deformation during the preparation process, the obtained porous film material generally has a larger pore size and poor filtration accuracy, which is difficult to meet the indoor air purification quality requirements.
At the same time, since the porosity of the porous film depends to a large extent on the porosity of the porous metal foil or metal screen, the porosity of the prepared porous film is usually below 40%, which is difficult to meet the requirements of the porosity of the porous film for special occasions. high requirements
Therefore, limited by the preparation method, the pore size and porosity of the porous film are usually difficult to meet the requirements for use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The preparation of the porous film includes steps: (1) adopting a layer of copper foil as a porous support body, its thickness is 0.05 mm, the mesh size is 30 μm, and the porosity is 58%; (2) using PVB as a binder, ethanol as Dispersant, prepare binder solution; then adopt 200 mesh screens to filter binder solution; (3) take dendritic Cu powder as raw material powder, average particle diameter is the NaCl powder of 5 μ m as pore-forming agent, according to Each 100mL of ethanol contains a ratio of 0.7gPVB, 60gCu powder, and 3gNaCl powder. Add Cu powder and NaCl powder to the filtered binder solution, and keep stirring until a uniform slurry is formed; (4) Spray the slurry On copper foil (the loading of paste is per m 3 The porous support is loaded with 400g of slurry) and dried at 60°C for 4 hours to make a membrane blank; (5) The membrane blank is sintered in sections, the first stage is raised from room temperature to 200°C and kept for 150min, the heating rate 1-3°C...

Embodiment 2

[0023]The preparation of the porous film includes steps: (1) adopting a layer of aluminum foam as a porous support body, the thickness of which is 1.2 mm, the mesh size is 500 μm, and the porosity is 90%; then rolling for 2 minutes at a rolling gap of 1 mm; (2) take PVB as binder and ethanol as dispersant, prepare binder solution; then adopt 200 mesh screens to filter binder solution; (3) take dendritic Al powder as raw material powder, average particle size NaCl powder with a diameter of 20 μm is used as a pore-forming agent. According to the ratio of 1.1gPVB, 70gAl powder, and 5gNaCl powder per 100mL of ethanol, the Al powder and NaCl powder are added to the filtered binder solution, and continuously stirred until the formation of Uniform slurry; (4) the slurry is sprayed on the aluminum foam (the loading capacity of the slurry is per m 3 The porous support is loaded with 600g slurry) and dried at 60°C for 4 hours to make a membrane blank; (5) Roll the membrane blank for 2mi...

Embodiment 3

[0025] The preparation of porous film comprises the steps: (1) adopting two layers of nickel foam as a porous support body, each layer of thickness is 0.5mm, mesh size is 100 μm, and porosity is 88%; Roll for 3min under rolling gap; (2) prepare binder solution with CMC as binder and water as dispersant; then use 200 mesh screen to filter binder solution; (3) use dendritic The Ni powder is the raw material powder, and the NaCl powder is the pore-forming agent. According to the ratio of 1.5gCMC, 80gNi powder, and 10gNaCl powder per 100mL of water, add the Ni powder and NaCl powder to the filtered binder solution, and keep stirring To form a uniform slurry; (4) the slurry is sprayed on the nickel foam (the loading capacity of the slurry is per m 3 The porous support is loaded with 600g slurry) and dried at 60°C for 4 hours to make a membrane blank; (5) Roll the membrane blank for 2min at a rolling gap of 0.8mm; (6) Roll the membrane blank after rolling Carry out segmented sinter...

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Abstract

The invention discloses a preparation method of a porous film. The preparation method comprises the following steps: (1) acquiring a porous support body; (2) preparing a thick size containing raw material powder, a binder, a dispersant and a pore forming agent; (3) loading the size onto the porous support body, and drying to make a film billet; (4) sintering the film billet to make a porous film precursor; (5) removing the pore forming agent from the precursor to obtain a porous film with the thickness of 5-3,000 [mu]m, the average aperture of 0.05-100 [mu]m and the porosity of 40-90%. The preparation method has the following advantages: firstly, no chemical reaction occurs between the pore forming agent and the raw material powder, so that the ingredients of the porous film cannot be damaged; secondly, the pore forming agent is excellent in thermal stability and always occupies a certain space (place) in the sintering process; after sintering, the pore forming agent is removed, holes or pores are generated in situ; therefore, the whole technological process is simple, the hole structure of the porous film is easy to control, and the porosity is remarkably improved.

Description

technical field [0001] The invention relates to a preparation method of a porous film. Background technique [0002] Since sintered inorganic porous material filter elements have stronger advantages than current filter elements (such as organic filter membranes) in terms of chemical corrosion resistance and irreversible pollution resistance of materials, it is possible to develop new technologies that can be used in many fields The new sintered inorganic porous material filter element, especially the sintered metal porous material filter element, which replaces the original filter element is of great significance. The applicant of this application has successively submitted a number of patent applications with publication numbers CN104588651A, CN104759629A, CN104759630A, etc., and has developed an unsupported porous film with excellent characteristics of sintered inorganic porous materials. However, in order to pursue better filtration performance, it is required to increas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/02B01D69/10B01D67/00
CPCB01D67/0041B01D67/0046B01D69/10B01D71/022B01D71/024B01D2323/28
Inventor 高麟汪涛王韬尹丽李波
Owner CHENGDU INTERMENT TECH
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