36results about How to "Good pore size uniformity" patented technology

The present invention provides an enhanced millipore filtering film and a method, device for preparing, the enhanced millipore filtering film includes a non-woven fabric as substrate, employing casting wipe way, casting film liquid is applied on the front and the back surfaces of the non-woven fabric, two layer film is formed by gelatin, characterized in that the thickness of the non-woven fabricis 30-120 micron, planar density of the non-woven fabric is 30-100g / m2, thickness of each film layer is 5-10 micron; casting film liquid in two film layer is composed by mixing a polymer resin, an organic solvent and an additive; parts by weight of the polymer resin in the casting film liquid, parts by weight of the organic solvent : parts by weight of the additive is 5-40:40-90: 0.5-50. The enhanced millipore filtering film of the invention is applied in the sampling monitor or filter of alpha radioaerosol under the high radon environment.

The invention discloses a method to prepare polyimide foam in the course that polyether is coupled with precursor. It makes aromatic dianhydride react with monohydroxy polyether and small molecular alcohol at 60-90 deg.C, to obtain aromatic diacid diester solution, then adds in aromatic diamine and small molecular ether to fully react at 50-80 deg.C, adds in foam stabilizer and strengthener; eliminates superfluous alcohol and small molecular ether to obtain polyether-coupled monomer precursor powder; places the powder in mould, preheats and foams at 70-180 deg.C, and solidifies at high temperature of 200-450 deg.C to obtain the polyimide foam which has closed cell structure and density 0.01-0.5g / cu cm.

The invention provides an aromatic polyamide slurry, which comprises the following raw materials: 15-30wt% aromatic polyamide compound, 2-15wt% reactive additives and 59-82wt% solvent, and 0.5-7wt% co-solvent can be added to the aromatic polyamide slurry, and a porous diaphragm prepared by using the aromatic polyamide slurry and a preparation method thereof are also provided. The aromatic polyamide porous diaphragm prepared by the present invention has high temperature resistance, good pore size uniformity and low moisture content, and can effectively improve the safety performance of the battery cell when applied to a lithium-ion battery while suppressing the cell capacity and degradation of cycle characteristics.

The invention discloses a preparation method of foamed aluminum alloy, and belongs to the field of porous metal materials. The method comprises the following steps that the surfaces of foaming agent particles are coated with a metal layer to prepare composite particles; the composite particles is uniformly mixed with an aluminum powder to prepare mixed powder, wherein the mass fraction of the foaming agent particles is 0.6 wt%-2 wt%; hot-pressing densification is performed on the mixed powder so as to obtain a foamed prefabricated part; the foamed prefabricated part is put into a heating furnace for heating and foaming, so that the prefabricated part is fully expanded to obtain the foamed aluminum alloy. The foamed aluminum alloy manufactured by the method disclosed by the invention is good in hole pattern, uniform in bore diameter and small in pore wall defect, so that the strength, the toughness and the elasticity modulus of the foamed aluminum are relatively high, and heat treatmentintensity potential is high as well; then the types and the contents of the alloy elements can be flexibly controlled by adjusting the thickness and the composition of a metal coating layer, so thata large space is provided for the performance design of the foamed aluminum; and in addition, the foaming expansion rate can be improved as well, the foaming temperature can be reduced, and the energyconsumption can be reduced.

A deposition mask according to an embodiment includes a metal plate having a first surface and a second surface, the metal plate including iron and nickel, having a thickness of 15 [mu] m to 30 [mu] m, the metal plate including a first surface layer having a depth of 20% or less of the thickness of the metal plate and a second surface layer having a depth of 20% or less of the thickness of the metal plate, when the diffraction intensities with respect to the (111), (200) and (220) crystal planes of the first surface layer are defined as I (111), I (200) and I (220), respectively, the ratios of the diffraction intensities of I (220), I (200) and I (220) are defined by Formula 1, Formula 2 and Formula 3, respectively, [Formula 1] A = I (220) / (I (200) + I (220) + I (111)) [Formula 2] B = I (200) / (I (200) + I (220) + I (111)) [Formula 3] C = I (111) / (I (200) + I (220) + I (111)) A is greater than the values of B and C, the value of B is greater than the value of C, and when the ratio of B to A (B / A

A high-strength and low-thermal-conduction foamed ceramic, a composite board using the foamed ceramic, and a preparation method thereof. The synthetic raw materials of the foamed ceramic include the following materials: magnesium source, aluminum source, silicon source, zinc source, foaming agent, The foamed ceramic contains magnesium-zinc spinel generated in situ. In this application, the zinc source is used as a catalyst. During the heating process, enstatite and magnesium-zinc spinel solid solutions are first formed. As the temperature increases, enstatite gradually dissolves, and the amount of magnesium-zinc spinel solid solutions gradually increases; During the high-temperature foaming process, the in-situ synthesized magnesium-zinc spinel solid solution crystallites have a pinning effect in the melt, which can reduce the rate of melt viscosity drop, effectively control the abnormal increase of pores, and obtain good uniformity of the pores. , Small-sized foamed ceramics.

The present invention discloses one kind of ordered porous anode oxidized alumina template preparing process. Compared with available technology, the said process has the advantages of capacity one preparing great area highly ordered nanometer template, high template success rate and high template quality including raised nanometer pore arrangement orderliness, pore size homogeneity, depth uniformity and porosity.

The invention relates to a plate-shaped corrugated membrane diaphragm having uniform aperture and a preparation method thereof, which belong to the technical field of sewage processing. According to the invention, a plate-shaped membrane having a corrugated shape is employed, and the method comprises a high-energy radiation etching step, a PET extrusion moulding step and a marking radiation pore-forming step; the PET extrusion moulding step employs a PET extrusion form to form a heterotype diaphragm, a nuclear track membrane moulding technology step is used on the heterotype diaphragm for completing the moulding of the aperture; and the plate-shaped corrugated membrane diaphragm having uniform aperture is prepared. The plate-shaped corrugated membrane diaphragm having uniform aperture has the advantages that PET extrusion moulding and the marking radiation pore-forming technology are combined, the corrugated plate-shaped membrane is obtained through PET extrusion, diaphragm applying while operation can be effectively prevented, the hydrophilic performance of a PET material is stronger than that of PVDF, good aperture uniformity can be guaranteed by the radiation pore-forming technology, and better effect of the plate-shaped corrugated membrane can be obtained through a plurality of effects.

The invention belongs to the technical field of inorganic membrane materials, and in particular relates to a ceramic flat membrane for perishable waste sewage treatment and a preparation method thereof. The invention provides a ceramic flat membrane for perishable waste sewage treatment, comprising an alumina ceramic flat membrane support body, a separation membrane layer and a polymer membrane layer coated on the outer surface of the ceramic flat membrane support body; Aluminum powder, binder, dispersant, and pore-forming agent; the separation membrane layer includes alumina powder, styrene oxide modified calcite powder, binder, dispersant, and pore-forming agent; the polymer membrane layer is perfluorinated Polyether carboxylic acid cross-linked dehydroabietic amine; the surface of ceramic flat membrane has good hydrophilicity, high water flux, high mechanical strength, good filtration performance, excellent anti-pollution performance and long service life.

A making method of an aperture connected support comprises the following steps: spraying expansion material powder particles to the aperture connected support, and expanding. The controllable adjustment of the size of the apertures of the support is realized through the making method, and the aperture connected support made in the invention has good uniformity. Porous metal materials prepared by adopting the above porous support made in the invention have the advantages of uniform distribution, arbitrary adjustment of the porosity, and wide uses.