36results about How to "Evenly distributed pore structure" patented technology

The invention belongs to the technical field of fiber membranes, and discloses a Kevlar nano fiber porous membrane which has high strength, high temperature resistance and solvent resistance, and a preparation method and application thereof. The preparation method comprises the following specific steps: dissolving Kevlar fibers in organic solvent, adding assistants and strong alkali, heating, and stirring to disperse, thus obtaining a Kevlar nano fiber dispersion; adding a pore forming agent into the dispersion, uniformly stirring to from a membrane casting solution, and performing vacuum degassing for later use; forming the membrane casting solution into a membrane on a glass plate through blade coating, evaporating the solvent, putting into a gel bath to obtain a gel membrane, and soaking in water; and performing heat treatment on the soaked gel membrane to obtain the Kevlar nano fiber porous membrane having high strength, high temperature resistance and solvent resistance. According to the invention, the Kevlar fibers are dispersed into nano fibers and then formed into the membrane through a mild method, so that the excellent properties of high strength, high modulus and solvent resistance are reserved; and a three-dimensional porous structure is endued. Thus, the Kevlar nano fiber porous membrane is applicable to water treatment in a harsh environment.

The invention discloses a preparation method of foamed copper to solve the problems of nonuniform pore structure distribution and small specific surface area of foamed copper obtained by existing foamed copper preparation processes. The method mainly comprises the steps of: (1) oil removal; (2) first coarsening; (3) second coarsening; (4) sensitization; (5) activation; (6) dispergation; (7) electroless copper plating; (8) step-by-step electroplating; and (9) heat treatment. The preparation method provided by the invention has the characteristics of simple technological steps, easily controllable process and low cost. By wholly optimizing the foamed copper preparation process, the obtained foamed copper has the advantages of high porosity, uniform pore structure distribution, large specific surface area, and good strength and toughness.

The invention discloses the application of a mixed cellulose ester film, a prepared battery and a preparation method. The film shows very excellent electrochemical performance as a diaphragm of an aqueous zinc-ion battery. And under the large current density of 5A g<-1>, the capacity retention ratio is still as high as 91.8% after circulation for 4000 circles, and the coulombic efficiency is closeto 100%. The novel diaphragm provided by the invention can greatly prolong the cycle life of the aqueous zinc-ion battery and improve the cycle stability of the aqueous zinc-ion battery, and is beneficial to promoting the development and application of the aqueous zinc-ion battery.

The invention relates to a porous silicon material and a preparation method thereof. The method for preparing the porous silicon material comprises the following steps: carrying out an in-situ catalytic reaction between a silicon material and chloromethane at the temperature of 401 to 800 DEG C in the presence of a solid copper-based catalyst, and preparing the porous silicon material through calcining, acid pickling, alkaline washing and other after-treatment impurity removal technologies, wherein the solid copper-based catalyst comprises one or a mixture of more than two in primary catalysts such as CuOx, CuCl and CuCl2, x is more than or equal to 0 and less than or equal to 1, as well as a small amount of secondary catalysts. Reaction condition parameters are regulated, so that the pore size, pore size distribution and porosity of the silicon material can be regulated. According to the method, a porous silicon material which is difficultly obtained in the patented technology at present is obtained, and important organic silicon monomer chemicals can be obtained. The porous silicon material prepared by the method is uniform in pore size, low in production cost, simple in process and suitable for industrial production and has wide application prospects.

The invention discloses a loop heat pipe and a preparation method of porous silicon nitride ceramic. The loop heat pipe is prepared from porous silicon nitride ceramic, of which the porosity is 50-70%, the strength is 10-30 MPa, and the average pore diameter is 0.5-1 [mu]m. The method comprises the following steps: with Si3N4 powder as a raw material, adding a sintering aid, and carrying out uniform mechanical wet ball milling mixing to form slurry; defoaming and degassing the slurry, freezing and curing the slurry at low temperature in a mold, and drying the material; putting the material into a muffle furnace for heat preservation to remove organic matter impurities; and finally, sintering the material in a sintering furnace at a high temperature to obtain the Si3N4 porous ceramic tube.The ceramic tube has the characteristics of high porosity, high strength, uniform pore structure distribution and the like, and can replace a metal loop heat tube to meet the use in the fields of loopheat tubes under a high-temperature condition and the like.

The invention discloses a preparation method of nano-pearl powder/C-HA composite scaffold. The preparation method comprises the following steps: firstly, dissolving chitosan and hyaluronic acid into an acetic acid solution with concentration of 1% respectively, stirring at 2000rpm for 5min, placing at room temperature for 24 hours, and obtaining a chitosan acetic acid solution and a hyaluronic acid acetic acid solution; secondly, 24 hours later, mixing the chitosan acetic acid solution and the hyaluronic acid acetic acid solution, and stirring at 2000rpm for 5 min; thirdly, adding the nano-pearl powder with the weight percentage of 1 to 25%, stirring at 2000 rpm for 5min; fourthly, putting into a -20 DEG C refrigerator for 24h, then freeze drying for 24h, and obtaining the composite scaffold. The technical problem to be solved by the invention is to provide a preparation method of nano-pearl powder/C-HA composite scaffold which has a suitable pore structure, is advantageous for cell proliferation, blood vessel growth and transport of nutrients, has good biological activity, biocompatibility and biodegradability, and can adapt to the specific shape of bone defects.

The invention relates to the technical field of electrode materials for supercapacitors, and discloses a high specific surface area coal-based nitrogen-doped activated carbon sphere electrode materialand a preparation method thereof. The high specific surface area coal-based nitrogen-doped activated carbon sphere electrode material is prepared according to the steps of enabling pulverized coal tobe reacted with a strong oxidant solution, performing hydrothermal reaction on obtained oxidized coal and glucosamine, mixing a powdered product obtained by washing and drying to obtain with potassium hydroxide, carrying out carbonization treatment, washing and drying an obtained mixed product to acquire a high specific surface area coal-based nitrogen-doped activated carbon sphere electrode material. According to the invention, the glucosamine is adopted to serve as a nitrogen source, the oxidized coal is adopted to serve as a carbon source, so that the yield of coal-based nitrogen-doped carbon spheres is effectively improved, and the high specific surface area coal-based nitrogen-doped activated carbon sphere electrode material is prepared. The high specific surface area coal-based nitrogen-doped activated carbon sphere electrode material has micro-nano morphology, is uniform in pore structure distribution and has excellent specific capacity and high-current charging and dischargingperformance when serving as a supercapacitor electrode material.

The invention relates to the technical field of coatings, and concretely discloses a water-based primer and a preparation method thereof. The water-based primer comprises a component A and a componentB; the component A comprises, by mass, an epoxy resin, an epoxy reactive diluent, a dispersant, a defoamer, a film forming aid, zinc powder, aluminum-silicon alloy powder, ferrophosphorus powder, expanded graphite, silica, a flash rust inhibitor and zirconium phosphate; the component B includes, by mass, a curing agent, and the balance of deionized water; and a mass ratio of the component A to the component B is (4-6):1. The water-based primer of the invention has the advantages of good stability, good impact resistance, good sag resistance, good drying speed, good salt spray resistance, goodflame retardant performance, simple preparation process, convenience in construction, and low production cost.

The invention discloses a negative electrode material, negative electrode slurry, a battery cell, a fast charging battery and a preparation method thereof, and belongs to the field of lithium ion batteries. The negative electrode material comprises a negative electrode active material and an inorganic solid electrolyte, the negative electrode active material comprises hard carbon and artificial graphite which are mixed, the weight ratio of the hard carbon in the negative electrode active material is 10-90%, and the content of the inorganic solid electrolyte is 2-10% of the weight of the hard carbon. A porous negative electrode dressing area is prepared by adding the solid electrolyte, mixing the solid electrolyte with hard carbon in the artificial graphite and mixing materials with different particle sizes, so that the problems of non-uniform current density distribution and poor dynamic performance caused by violent change of the porosity of a pole piece and non-uniform pore distribution after rolling of a traditional artificial graphite negative electrode are solved. The hard carbon material is a porous material, and through combination with the graphite and the solid electrolyte, the pore structure distribution is more uniform.

The invention relates to the technical field of battery materials, and discloses a battery diaphragm, a preparation method thereof, a lithium ion battery and an electric vehicle. The battery diaphragmcomprises a polymer fiber layer, wherein the polymer fiber layer contains polymer fibers, the polymer fibers contain a cross-linked polymer, and the cross-linked polymer is obtained by cross-linkingmodified polyethylene glycol terephthalate and an acrylate polymer; the modified polyethylene glycol terephthalate contains hydroxyl and/or carboxyl, or the modified polyethylene glycol terephthalatehas carbon-carbon double bonds. The battery diaphragm provided by the invention has good thermal shrinkage resistance, more uniformly distributed pores and good air permeability, and can meet the safety and electrochemical performance requirements of a lithium battery.

The invention relates to a preparation method of foamy copper with a micron aperture, and belongs to the technical field of foam metal. The method comprises the following steps: firstly, mixing pure copper particles or copper oxide particles with a solvent to prepare slurry; coating the pure copper slurry or the copper oxide slurry on a carrier; and drying the slurry, and then carrying out heat treatment or heat reduction treatment to obtain the foamy copper with the micron aperture. The foamy copper has the advantages of being complete in structure, uniform in pore structure distribution, micron in pore diameter and controllable in thickness.