Porous film and preparation method thereof
A technology of porous film and porous support, applied in separation methods, chemical instruments and methods, filtration separation, etc., can solve the problems of low strength and achieve the effects of strong strength, improved filtration accuracy, and high air flux
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[0037] Porous membranes with high strength, high filtration accuracy and high air flux can be obtained by using the following parameters and methods. The preparation method of the porous film taking Ni-Cu solid solution as example comprises the following steps:
[0038] 1) Prepare N blanks of filter units 100, N≥2;
[0039] A. Use Ni powder and Cu powder as raw material powder, CMC and SBR as binder, water as dispersant, configure the first slurry with a viscosity of 12000-18000mPa·s; with a thickness of 0.4-0.45mm and a pore size of The 50-80 mesh plain weave screen is the porous support body 10; then the porous support body 10 carrying the first slurry is passed between two scrapers with a gap of 0.46-0.49 mm at a speed of 3-5 m / min, Dry to obtain the precursor;
[0040] B. Use Ni powder and Cu powder as raw material powder, use PVA as binder, water as dispersant, configure the second slurry with a viscosity of 80-120mPa·s, and then mix the second slurry with 190-210g spr...
Embodiment 1
[0045] The preparation process of porous film in the present embodiment is as follows:
[0046] 1) Prepare two green bodies of filter units 100, that is, N=2;
[0047] A. Using Ni powder and Cu powder as raw material powder, the quality of Cu powder is 30% of the mass of raw material powder, the particle size of Ni powder and Cu powder is -400 mesh; with CMC and SBR as binder, the mass ratio of CMC to SBR 0.6:2; using water as a dispersant, the first slurry with a viscosity of 15000±10mPa·s can be prepared; in order to make the adhesive disperse more evenly, the adhesive should be prepared in advance so that the solid content is 2% The colloidal liquid is used; the thickness is 0.41mm, and the aperture is a 50 mesh plain weave screen as the porous support body 10; then the porous support body 10 carrying the first slurry passes through the gap at a speed of 4m / min. Between two spatulas of 0.47mm, dry to obtain the precursor;
[0048] B. take Ni powder and Cu powder as raw ma...
Embodiment 2
[0054] The sintered compact of this embodiment is composed of a green body of a filter unit 100, that is, the green body of a filter unit 100 prepared in step 1) in Example 1 is directly sintered in step 3), and the obtained porous film is numbered as B#.
[0055] The pore diameter of the porous film of Example 1-2 is measured by the bubble test in standard ISO 4003:1977, the strength of the porous film of Example 1-2 is tested by the method in GB / T228-2002, and the porous film of Example 1-2 is tested by GB / T14295-2008 The gas flux of the porous film of Example 1-2 was tested by the method. The test results are shown in Table 1.
[0056] Table 1
[0057]
[0058]
[0059] As can be seen from Table 1, although the air flux of the porous film of Example 1 is lower than that of Example 2, it is still >500m 3 / m 2 kpa h. The average pore diameter of the porous film of Example 1 is lower than that of Example 2, indicating that the filtration accuracy has been improved. ...
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