8results about How to "Improve microporous structure" patented technology

The invention belongs to the field of environmental protection and pollutant treatment, and relates to a method for enriching and detecting microplastics in a surface water body. The lignin is grafted with amido and carboxyl through two-step reaction, firstly, carbon quantum dot active site powder with positive charges on the surface is prepared, the carbon quantum dot active site powder is cross-linked with the modified montmorillonite, and the carbon quantum dot active site microporous adsorbent is prepared, so that the prepared adsorbent has multiple surface functional groups and multiple and uniform active sites, and the adsorption efficiency is improved. The adsorption speed of the micro-plastics in the water body can be increased, the adsorption capacity of the micro-plastics in the water body is improved, and rapid enrichment and separation of the micro-plastics in the water body are realized. Based on the enrichment and separation method, the invention further provides a method for measuring the microplastics in the water environment. According to the invention, rapid filtration, enrichment and detection of micro-plastics in water are realized, the operation is simple and convenient, and the accuracy is high.

The invention relates to the technical field of thermal insulation materials, and discloses a polyurethane foam material and a preparation method and application thereof, the polyurethane foam material is prepared from a raw material composition containing polyol, isocyanate, a catalyst, a polymer microsphere emulsion and a filler; the filler contains one or more than two of aerogel, fumed silica and polymer microspheres; the polymer microsphere emulsion is prepared by adopting a soap-free emulsion polymerization method, the preparation raw materials of the polymer microsphere emulsion comprise an oleophylic polymeric monomer and an amphiphilic polymeric monomer, and the polymer microsphere is prepared by drying the polymer microsphere emulsion. According to the invention, the polymer microsphere emulsion is used as a foaming agent, and the polymer emulsion does not contain fluorine and a traditional surfactant, so that the prepared polyurethane foam material is low in heat conductivity coefficient and density, good in heat preservation and heat insulation performance and environment-friendly, and meanwhile, the strength of polyurethane foam can also be improved; by adding the filler, the heat conductivity coefficient of the polyurethane foam material can be further reduced, and the thermal insulation performance of the polyurethane foam material is improved.

The invention relates to a deep purification smelting method for high-purity steel, and relates to the technical field of high-purity steel smelting. The steel comprises the following chemical components in percentage by weight: 0.17%-0.18% of C, 0.65%-0.7% of Mn, 0.006%-0.01% of S, 0.006%-0.01% of P, 0.18%-0.23% of Si, 1.6%-1.65% of Cr, 1.5%-1.55% of Ni, 0.28%-0.29% of Mo, 0.1%-0.15% of Cu, 0.02%-0.025% of Al, 1.0 ppm-1.2 ppm of H, 10 ppm-15 ppm of O and 60 ppm-70 ppm of N. The method comprises the following operation steps: smelting crude molten steel in an electric arc furnace, performing vacuum refining, performing double-vacuum degassing, and performing gas protection die casting. The ferrocenyl intercalated talcum powder is prepared from talcum powder, gamma-mercaptopropyltrimethoxysilane, water, sodium p-styrenesulfonate, N-ferrocenyl-maleimide and sodium hydroxide, and the ferrocenyl intercalated talcum powder is prepared from the talcum powder, gamma-mercaptopropyltrimethoxysilane, water, sodium p-styrenesulfonate, N-ferrocenyl-maleimide and sodium hydroxide.

The application relates to the field of electrochemical energy storage technology and discloses a nitrogen-doped porous nanocarbon material, wherein the nanocarbon material has microporous structure and mesoporous structure, the BET specific surface area of the nanocarbon material is 300-3000 m 2 / g, the proportion of the specific surface area in micropores in the total specific surface area is higher than 60%; the total pore volume of the nanocarbon material is 0.5-2 cm 3 / g, the proportion of the pore volume in micropores in the total pore volume is higher than 50%; the mass percentage of surface carbon of the nanocarbon material is 70-95% measured by X-ray photoelectron spectroscopy; the mass percentage of nitrogen is 1-20%; and the nanocarbon material has a sheet-like appearance. The preparation method can realize high nitrogen doping, catalytic graphitization and activation pore-forming of the nanocarbon material at the same time. When the nitrogen-doped nanocarbon material is applied to a supercapacitor and a water-based alkaline electrolyte is used, the specific capacitance of a single electrode can be up to 252 F / g at a current density of 1 A / g, and the nanocarbon material exhibits excellent capacitive performance.

The application discloses low-density monolithic porous carbon and a microemulsion preparation method and application thereof, and relates to the field of foam carbon materials. The porous carbon material comprises a three-dimensional network structure formed by cross-linking and stacking of cavity carbon nanoparticles, and has a density of 0.16-0.35 g / cm 3 ; the phenolic resin is used as a precursor, the foaming agent, i.e., the microemulsion droplet of the imidazole compound, is used as a template, and a green solvent is used, and the monolithic porous carbon is obtained through a sol-gel reaction, drying and pyrolysis. The imidazole compound and the hydrophilic end of the foaming agent interact to form a flexible small-molecule interface film, reduce the interfacial tension and stabilize the emulsion droplet. The foaming agent is decomposed to form a cavity spherical structure during carbonization. The monolithic porous carbon has a developed porous structure and surface hydrophobicity, is beneficial to constructing a high-efficiency electrocatalytic reaction microenvironment, and is reflected in improving the surface reaction gas concentration and inhibiting excessive mass supply, so as to improve the electrocatalytic reaction selectivity. Based on the morphology, pore structure and surface properties, the monolithic porous carbon also has application potential in the fields of water purification and heat insulation and flame retardation.

The invention discloses a liquid collecting method for a concealed limestone area, which comprises the following steps: firstly, constructing a liquid collecting roadway above an area which is easy to leak, and after the liquid collecting roadway is constructed, arranging a grouting pipe on a roadway bottom plate and injecting modified cement mortar; the modified cement mortar is prepared by mixing cement, leachate clarified waste residues, methyl methacrylate, fine aggregate, fly ash, latex powder, cellulose, starch ether, boric acid, a lubricant, phosphate betaine and the like. And meanwhile, a horizontal hole is constructed in the position 2.5-3.5 m below the liquid collecting roadway, and then modified cement mortar is injected into the horizontal hole for blocking. According to the characteristics of the hidden limestone region, an effective leakage repairing scheme is set, and the problems that leakage is much and leakage repairing is difficult in the in-situ leaching mining process of the rare earth ore in the hidden limestone region are solved.

The invention discloses a PPS / PTFE composite filter material based on hot-pressing reinforcement and a preparation method thereof, and belongs to the technical field of industrial flue gas purification. The material is prepared by taking a PPS needled felt as a base material, coating the surface of the PPS needled felt with a PTFE (Polytetrafluoroethylene) foam coating containing nano silicon dioxide and carrying out hot-pressing treatment at 200 DEG C. According to the method, by optimizing the hot pressing process, the bonding strength of the PTFE coating and the PPS base material is remarkably enhanced, and the pore structure of the material is effectively improved. The filtering efficiency of the obtained filter material on particles with the particle size larger than or equal to 1.0 micrometer reaches 92.6% or above, the abrasion resistance is greatly improved, the abrasion loss of a coating is only 0.0325-0.0337 g after 300 times of abrasion, the filtering resistance is kept between 136 Pa and 160 Pa, and meanwhile the filter material has good temperature resistance and corrosion resistance and is suitable for efficient purification of high-temperature and high-corrosion industrial flue gas.

This application relates to the textile field, specifically disclosing a thermal insulation fabric and its production method. The thermal insulation fabric comprises, from the outside in, a PTFE garment film, an adhesive layer, a polyethersulfone / polyurethane mixed fiber wadding, a hollow PBT core-sheath composite fiber layer, an adhesive layer, and a polyurethane / zirconia aerogel composite fiber layer. The polyurethane / zirconia aerogel composite fiber layer is woven from polyurethane / zirconia aerogel composite fibers, which have a core-sheath structure. It is prepared by coaxial wet spinning of the sheath solution and the core solution, followed by impregnation in a tert-butanol aqueous solution, pre-freezing, and freeze-drying. The sheath solution is a polyurethane solution, and the core solution is a polyurethane solution containing zirconia aerogel powder, with a mass ratio of zirconia aerogel powder to polyurethane of 0.2-0.3:1. The thermal insulation fabric of this application has the advantages of good thermal insulation effect, high mechanical strength, high compression resilience, and relatively fluffy texture.