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Porous film and preparation method thereof

A porous film and porous support technology, which is applied in the field of preparation of the porous film, can solve the problems of large raw material powder gap, high tap density, and reduced flatness of the porous film.

Active Publication Date: 2016-08-17
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 due to the high content of the binder in the slurry, on the one hand, the dried membrane blank has a large shrinkage, resulting in a significant decrease in the flatness of the porous film. On the other hand, the surface tension of the slurry is large, and the gap between the raw material powders is large, resulting in large pores in the porous film; in addition, the raw material powder is usually spherical or spherical, with a small specific surface area and a high tap density. Porous membranes have less gas flux
Furthermore, the raw material powder is mixed powder, and the phase formation mechanism and pore-forming mechanism of the porous film are complicated, and the composition and pore structure of the final porous film material are difficult to control.

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; Adopt 200 mesh screens to filter binder solution then; (3) take dendritic Cu powder as raw material powder, contain the proportioning of 0.7gPVB, 60gCu powder in every 100mL ethanol , adding Cu powder to the filtered binder solution, stirring continuously until a uniform slurry is formed; (4) spraying the slurry on the copper foil (the loading capacity of the slurry 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 / min, the second stage is raised to 650°C and held for 200 minutes, the heating rate is...

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, ethanol as dispersant, prepare binder solution; Adopt 200 mesh screens to filter binder solution then; (3) take dendritic Al powder as raw material powder, press every 100mL of ethanol contains a ratio of 1.1gPVB and 70g of Al powder. Add the Al powder to the filtered binder solution and keep stirring until a uniform slurry is formed; (4) Spray the slurry on the aluminum foam (slurry The load capacity 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 1.2mm; (6) Roll the membrane blank Carry out segmented sintering, the first stage is raised from room temperature to 200°C and kept...

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) use PVB as binder and ethanol as dispersant to prepare binder solution; then use 200-mesh screen to filter binder solution; (3) use dendritic Ni powder is raw material powder, according to the proportioning that contains 1.5gPVB, 80gNi powder in every 100mL ethanol, Ni powder is added in the binder solution after filtering, stir constantly until forming uniform slurry; (4) slurry The slurry is sprayed on the nickel foam (the loading 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 sintering, the first stage is raised from room temperature to ...

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Abstract

The invention discloses a porous film which comprises a filtering layer and a porous support, wherein the filtering layer is composed of dendritic metal substance powder and / or metal substance oxide powder. A preparation method for the porous film comprises the following steps: 1) acquiring the raw material powder and the porous support, wherein the raw material powder is the dendritic metal substance powder and / or the metal substance oxide powder; 2) preparing slurry; 3) loading the slurry on the surface of the porous support, drying and preparing into a film blank; 4) sintering the film blank and cooling, thereby acquiring the porous film. Firstly, the dendritic metal substance powder is stacked and formed into the pores of the porous film, the complex hole-forming process is avoided and the porosity is high and is easy to control; the filtering layer composed of the dendritic metal substance powder and / or the metal substance oxide powder is stable in physico-chemical property, long in service life and free from mutual reaction; the complex phase-forming process is avoided; the component of the porous film is easy to control.

Description

technical field [0001] The invention relates to a porous film, and also relates to a preparation method of the 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 p...

Claims

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Application Information

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IPC IPC(8): B01D71/02B01D69/10B01D67/00B01D46/54
CPCB01D46/543B01D67/0046B01D69/105B01D71/022B01D71/024B01D2323/12B01D2323/18
Inventor 高麟汪涛王韬尹丽张伟蒋一可李波
Owner CHENGDU INTERMENT TECH
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