204results about How to "Improve surface properties" patented technology

The invention relates to the technical field of surfactants, and discloses a preparation method of a modified polycarboxylate surfactant and application of the modified polycarboxylate surfactant in pesticide preparations. 3-hexene-1, 6-diamine and epoxy chloropropane are used as raw materials, 1, 6-tetraglycidylamine-3-hexene is obtained through ring-opening and ring-closing reactions, 1, 6-tetraglycidylamine-3-hexene is utilized twice, and the yield of the 1, 6-tetraglycidylamine-3-hexene is increased. The preparation method comprises the following steps: sequentially reacting 2, 3, 4, 6-tetraglycidylamine-3-hexene with sodium hydrogen sulfite and phosphoric acid to obtain tetrasulfonate hexene and tetraphosphate hexene, and copolymerizing the tetrasulfonate hexene and the tetraphosphate hexene with acrylic acid and methacrylate to obtain the modified polycarboxylate surfactant. The modified polycarboxylate surfactant prepared by the preparation method disclosed by the invention has excellent dispersing performance, heat storage stability and relatively high suspension rate.

The invention relates to the technical field of polishing solutions, in particular to an efficient and environment-friendly chemical polishing solution and a preparation method thereof. The chemical polishing solution comprises the following raw materials in percentage by weight: 5%-8% of a nano metal abrasive, 2%-4% of a silicon oxide abrasive, 2%-10% of an oxidizing agent, 1%-5% of a complexing agent, 0.05%-0.5% of a corrosion inhibitor and the balance of deionized water. The chemical polishing solution further comprises a pH regulator, and the pH of the chemical polishing solution is regulated to 7.5-8.5 by adopting the pH regulator. The chemical polishing solution disclosed by the invention adopts environment-friendly raw materials, shows a good polishing effect when being used for precision machining of the monocrystalline silicon wafer, and is high in material removal efficiency, and the polished silicon wafer is smooth in surface and free of damage.

The invention provides a preparation method and application of a fluorine-free sand streak agent. The preparation method of the fluorine-free sand streak agent comprises the following steps: S11, activating the surface of PMMA micro powder by utilizing a low-temperature plasma technology; s12, dispersing the activated PMMA micro powder in an organic solvent to obtain a reaction solution A; dispersing an acrylic monomer in an organic solvent to obtain a reaction solution B; dispersing an initiator in an organic solvent to obtain a reaction solution C; and S13, under the protection of nitrogen, introducing the reaction liquid A, the reaction liquid B and the reaction liquid C into a micro-channel reactor for graft copolymerization, cleaning and drying to obtain the PMMA micro powder with acrylic acid grafted on the surface.

The invention discloses a UV (ultraviolet) excimer skin-touch paint for a relief melamine base material and application of the UV excimer skin-touch paint, and relates to the technical field of paints.The UV excimer skin-touch paint comprises the following components in percentage by weight: 15-50% of UV adhesion promoting resin; 5-10% of modified epoxy acrylate resin; 20 to 50% of special modified polyurethane acrylate resin; 5-20% of amino acrylate resin; 1-5% of phosphoric acid modified acrylate resin; 0.1-1% of a surface tension control agent A; 0.1-1% of a surface tension control agent B; 0.1-1% of a defoaming agent; 0.2-2% of an organosilicon hand feeling auxiliary agent; 0.1 to 0.5 percent of organic silicon leveling agent; 2-8% of a photoinitiator C; 0.3-1% of a wetting dispersant; 1-5% of polyethylene wax powder; and 10-30% of a UV active monomer. According to the invention, the relief melamine base material can realize open coating of the excimer skin-touch paint, and the coated paint film has good surface effect, uniform plate surface gloss without floating, no dust and no white exposure of the guide pipe, and good open effect.

The invention relates to the technical field of concrete materials, and particularly discloses a composite mineral admixture, a preparation method thereof and concrete. The preparation method of the composite mineral admixture comprises the following steps: mixing and modifying dolomite powder, gypsum and calcium hydroxide to obtain pre-modified dolomite powder; then adding hexadecyl trimethyl ammonium chloride and octylphenol polyoxyethylene ether to obtain modified dolomite powder; and adding nickel slag, metakaolin, desulfurized fly ash and a grinding aid, and grinding to obtain the composite mineral admixture. The concrete prepared from the composite mineral admixture is excellent in compressive strength, shrinkage resistance, permeation resistance and the like, and the strength and durability of the concrete can be remarkably improved.

The invention relates to a continuous casting and rolling rapid processing technology of a medicine foil. The process comprises the steps of raw material preparation, smelting and refining, continuous casting, cooling treatment, heating and rough rolling, finish rolling, annealing treatment, surface treatment, slitting and the like. By controlling the smelting temperature, the casting speed, the rolling speed, the roller surface roughness, the annealing parameters and other process conditions, efficient production of the aluminum foil is achieved, and the surface smoothness, the thickness precision, the tensile strength and the ductility of the medicine foil are guaranteed. The thickness of the finished medicine foil is 0.02-0.04 mm, the tensile strength is 80-120 MPa, the ductility is not lower than 1.5%, and the surface roughness Ra value is controlled to be 0.1-0.3 micron. The process can produce high-quality medicine foil meeting the medicine packaging requirement, has the advantages of being efficient, stable, energy-saving and environment-friendly, and is suitable for large-scale industrial production.

The invention discloses a hydrophilic carbon-based material modified high-entropy alloy water electrolysis hydrogen production catalyst and a preparation method and application thereof, and belongs to the technical field of catalyst preparation. Comprising the following steps: 1) adding a hydrophilic carbon-based material and mixed metal salt into an ethylene glycol solution, and ultrasonically mixing uniformly to obtain a reaction solution; and 2) heating an ethylene glycol solution to 200-240 DEG C through an oil bath, then slowly adding the reaction liquid prepared in the step 1) into the ethylene glycol solution, carrying out heating treatment for 0.5-2 hours, cooling, and centrifuging to prepare the carbon-based material modified high-entropy alloy water electrolysis hydrogen production catalyst. The prepared hydrophilic carbon-based material modified high-entropy alloy water electrolysis hydrogen production catalyst has high activity, and generated hydrogen bubbles are smaller and can be separated from the surface of an electrode more easily.

The invention relates to the technical field of silicone rubber foam materials, in particular to high-compression-strength surface hydrophobic silicone rubber foam and a preparation method thereof. The high-compression-strength surface hydrophobic silicone rubber foam comprises the following substances in parts by weight: 300-500 parts of heat vulcanized silicone rubber and 2-8 parts of a hydrophobic modifier, 0.1 to 1.0 part of a photoinitiator; the hydrophobic modifier comprises a compound with a sulfydryl group and a compound with a hydrophobic group. According to the technical scheme, the components of the surface hydrophobic silicone rubber foam are optimized, the heat vulcanized silicone rubber provides necessary mechanical strength and durability, and the hydrophobic modifier obtains a hydrophobic or hydrophilic surface on the surface of a polymer through a simple mercaptan-ene click reaction; the method has the advantages of simple preparation process, high selectivity, no by-product, mild reaction conditions and short reaction time, meets the requirements of industrial production, and is beneficial to application in production practice.

The invention discloses a plasma-based self-assembly nonlinear conductive coating preparation system and method. The system comprises a plasma processing platform, a sample preparation platform and a curing platform, the plasma processing platform comprises a plasma discharge power supply, an oscilloscope, a gas distributor and a reaction cavity; the sample preparation platform comprises an ultrasonic stirring unit, a magnetic stirring unit and a vacuum stirring unit, the curing platform comprises a heating oven and a pouring mold arranged in the heating oven, and the pouring mold is connected with an induction electrode assembly. The plasma-based self-assembly nonlinear conductive coating preparation system not only can integrate a plasma modification technology to realize optimization of a method for preparing a coating through electric field induction, but also can consider the requirement on the bonding strength of the coating, so that the nonlinear conductive coating with excellent nonlinear conductive characteristics and good surface adhesion is prepared.

The invention belongs to the technical field of hexafluoroethane purification, and particularly relates to a purification process and a purification device of electronic-grade hexafluoroethane. The purification process of the electronic-grade hexafluoroethane comprises the following steps: introducing a hexafluoroethane crude product into a preprocessor, and carrying out pretreatment; introducing the crude product treated by the pretreater into an adsorption tower for adsorption; introducing the adsorbed crude product into a condenser to remove non-condensable gas so as to obtain crude product condensate, and introducing the crude product condensate into an alkali washing tank for alkali washing; and the alkali-washed crude product sequentially enters a degassing tower and a rectifying tower, and is degassed and rectified to obtain the electronic-grade hexafluoroethane product. According to the purification process of the electronic-grade hexafluoroethane, the pretreatment agent and the adsorbent are designed, so that the purity of the hexafluoroethane reaches 99.999%, the conversion of pentafluoromonochloroethane and the removal of trifluoromethane are realized, the process is simple, and the energy consumption is low; the invention also provides a purification device corresponding to the purification process of the electronic-grade hexafluoroethane.

The invention discloses a pressure reducer shell surface modification method, which belongs to the technical field of pressure reducer shell processing, and comprises the following steps: (1) surface oil removal and cleaning treatment, (2) surface shot blasting treatment, (3) surface electric arc spraying treatment, and (4) cooling treatment. The treatment process is simple in step and reasonable in matching, the surface characteristics of the pressure reducer shell are effectively enhanced, the corrosion resistance and weather resistance of the pressure reducer shell are remarkably enhanced, and the service life of the pressure reducer shell is effectively prolonged.

The invention discloses a modified CM square electric power corrugated pipe, belongs to the technical field of electric power pipe processing, and aims to solve the technical problem that the burnthrough resistance and the mechanical strength of a square electric power corrugated pipe in the prior art need to be further improved. The corrugated pipe comprises a square pipe and a plurality of corrugated rings arranged outside the square pipe, the square pipe and the corrugated rings are made of a modified CM material, siloxane-enhanced modified chlorinated polyethylene rubber and chlorinated polyvinyl chloride are combined to form a mixed matrix, and the mixed matrix is enhanced by using a composite filler composed of modified inorganic powder and modified glass beads. The tensile property and the impact resistance of the modified CM square electric power corrugated pipe are effectively enhanced, the burn-through resistance and the low temperature resistance of the material are improved, and the modified CM square electric power corrugated pipe is more convenient and more advantageous in practical application by optimizing the structure of the electric power corrugated pipe.

The invention relates to the technical field of batteries, and discloses a method for modifying an electrode for an all-vanadium redox flow battery through electro-deposition, and the method comprises the following steps: step 1, preparing an electrode solution; 2, preparing a graphite felt electrode; and step 3, assembling the battery. 2-methylimidazole, cobalt nitrate and zinc nitrate are dissolved and mixed to form a solution containing metal ions, the metal ions are embedded into the surface of the graphite felt in the electro-deposition process to form a coating layer, the surface property is enhanced, CHI660e is used for performing an electrochemical performance test, and the electrochemical performance of the graphite felt is greatly improved. The actual electrochemical activity of the modified graphite felt electrode can be evaluated, whether the hydrophilicity and conductivity of the graphite felt electrode are remarkably improved or not is verified, and the beneficial effects that the graphite felt is used as the electrode, the graphite felt has the hydrophilicity, and the electrochemical activity of the graphite felt is improved are achieved.

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a lithium ion battery high-voltage electrolyte and a lithium ion battery. The high-voltage electrolyte comprises a lithium salt, a first additive, a second additive, an auxiliary additive and an organic solvent, the first additive is a sulfur-containing siloxy boric acid ester derivative, and the second additive is a benzofuran boric acid ester derivative. Borate groups and benzofuran groups in the first additive and the second additive can promote generation of CEI and SEI protective films on the surfaces of a positive electrode and a negative electrode, the stability of the material is enhanced, electrolyte decomposition is inhibited, and the high-voltage performance of the lithium battery is improved; the trimethylsiloxy group can remove HF in the system, can reduce the corrosion to the positive and negative electrode interface of the battery, and improves the cycle performance of the battery; boron and sulfur atoms in the additive can significantly reduce the internal resistance of the battery and improve the performance of the high-voltage battery at low temperature.

The invention relates to a preparation method of an aluminum alloy corrosion-resistant composite coating, and belongs to the technical field of aluminum alloy treatment. The method comprises the following steps: firstly, mixing sodium phosphate, sodium silicate, sodium fluoride, ammonium metavanadate, sodium molybdate and sodium hydroxide according to a specific proportion to prepare a micro-arc oxidation liquid medicine, and carrying out micro-arc oxidation treatment on a pretreated aluminum alloy to form a black micro-arc oxidation coating; then, potassium permanganate and hydrogen peroxide are used for treating the multi-walled carbon nanotubes, zinc elements are introduced into the carbon nanotubes, the carbon nanotubes and the graphene oxide are combined through ball milling treatment, meanwhile, a silane coupling agent KH560 is added, compatibility is further enhanced, and the composite filler is obtained. And the composite filler is mixed with water-based acrylic resin emulsion, water-based polyurethane emulsion and the like to prepare an electrophoretic coating, and the aluminum alloy subjected to micro-arc oxidation is subjected to electrophoretic deposition treatment to obtain the composite coating. The aluminum alloy corrosion-resistant composite coating prepared through the method has excellent absorbance and good corrosion resistance.

The invention discloses a preparation method of a water-based coating for antistatic treatment of a flexible PVC (polyvinyl chloride) material, belongs to the technical field of antistatic coating processing, and aims to solve the technical problem that the flexibility, conductivity and conductive stability of a water-based coating film in the prior art need to be further improved. The preparation method comprises the following steps: adding polyacrylate into a polyurethane emulsion, stirring, adding a sodium hydroxide solution into a reaction system, adjusting the pH value of the system to 8-9, raising the temperature of the reaction system to 70-80 DEG C, carrying out heat preservation and stirring for 90-120 minutes, and carrying out post-treatment to obtain composite polyurethane; the graphene oxide is modified and then mixed with the polyacrylate reinforced composite polyurethane material, so that the antistatic property, flexibility and adhesiveness of the water-based paint are effectively improved, the water-based paint has good washing migration resistance, and the conductive stability of the water-based paint is improved.

The invention discloses a preparation method of a coating for realizing high absorbance on a substrate surface, which comprises the following steps: designing a PVD (Physical Vapor Deposition) coating structure according to the type of a coating material, and controlling the thickness of the coating to be within a preset range by adjusting deposition parameters; pretreating the carbon nano tube by adopting a high-speed shearing dispersion technology, and measuring the performance of the carbon nano tube dispersion liquid; establishing a coating formula database according to the performance of the carbon nanotube dispersion liquid, and screening solvent types through an orthogonal test; carrying out surface modification on the carbon nano tube by adopting plasma treatment, and measuring the content of functional groups on the surface of the carbon nano tube; the uniformity of the coating is improved in a multi-time coating mode, infrared drying is carried out after each time of coating, and the thickness of the coating is measured; and the surface roughness and hardness of the coating are measured, and the preliminarily screened PVD coating material is obtained.

The invention provides a preparation method of a biological functional agent containing bioactive components, which comprises the following steps: dispersing the bioactive components in water; adding the zeolite-loaded titanium dioxide composite material, absolute ethyl alcohol, isopropyl triisostearoyl titanate and polyvinylpyrrolidone into the mixed solution, stirring at the temperature of 65-75 DEG C to obtain a mixed solution containing bioactive components, stirring for 80-100 minutes, and centrifugally drying to obtain the composite material. According to the preparation method of the biological functional agent containing the bioactive components, the loading capacity of the bioactive components on the carrier is improved, the stability of the bioactive components is improved, and the slow release effect is enhanced, so that the preparation efficiency and performance of the biological functional agent are improved; wide prospects are provided for application in the fields of medicines, cosmetics, environmental protection and the like.

The present invention provides a modified polyphenylene ether resin foam sheet which has good moldability, a very low relative dielectric constant and a very low dielectric loss factor at high frequencies, self-extinguishing properties or flame retardancy imparted thereto, and excellent surface properties. This modified polyphenylene ether resin foam sheet is obtained by foaming a modified polyphenylene ether resin containing a flame retardant, and has a relative dielectric constant of 1.10-2.00 and a dielectric loss factor (tan [delta]) in the range of 0.5 * 10 <-3 > to 2.5 * 10 <-3 >. The modified polyphenylene ether resin foamed sheet according to the present invention is a modified polyphenylene ether resin foamed sheet in which a modified polyphenylene ether resin foamed resin containing both a halogen-based flame retardant and a phosphorus-based flame retardant having a specific weight-average molecular weight is foamed. And the average bubble diameter and the bubble number density of the modified polyphenylene ether resin foam sheet are within predetermined ranges.

The invention relates to the technical field of cement additives, in particular to a powder composition for cement addition and a preparation process of the powder composition, modified sodium lignin sulfonate serves as an important component of the powder composition, dispersity and stability of sodium lignin sulfonate are effectively improved through sulfomethylation and condensation reaction, and in cement concrete, the powder composition has the advantages that the dispersity and stability of sodium lignin sulfonate are improved; the modified sodium lignin sulfonate can be adsorbed on the surfaces of cement particles to form a protective film, friction force and resistance among the cement particles can be reduced, so that the fluidity of the concrete is improved, meanwhile, a sulfomethylation structure of the modified sodium lignin sulfonate can chemically react with calcium ions in the cement to form stable calcium salt, the stability of the concrete is further enhanced, and the service life of the concrete is prolonged. According to the powder composition for cement addition and the preparation method of the powder composition, the performance of cement concrete can be remarkably improved through well-designed components, and the composition has excellent flowability, anti-permeability, anti-freezing property, water resistance, mildew resistance and rust resistance.

The invention belongs to the technical field of biomedical materials, and particularly relates to a carboxymethyl chitin composite material for an articular cavity and a preparation method of the carboxymethyl chitin composite material. The carboxymethyl chitin composite material for the articular cavity is prepared by selecting carboxymethyl chitin, hyaluronic acid, sodium alginate and chitosan which are good in biocompatibility as raw materials and performing functional modification treatment respectively, and through the synergistic effect of all the components, the elasticity modulus of the composite material is effectively improved, the swelling rate is reduced, and the joint cavity is more stable. And meanwhile, the composite material also has proper viscosity and degradation performance, and can meet application requirements.

The invention relates to a modified hydrogen-silicon-containing modified oil polyether demulsifier and a preparation method thereof, and belongs to the technical field of oil field chemicals. The preparation method comprises the following steps: carrying out polymerization reaction on modified polyether taking an amino-modified molybdenum disulfide nanosheet as an initiator, hydrogen-containing silicone oil block polyether modified by a silane coupling agent and quaternary ammonium salt containing a furan structure under the action of ammonium persulfate and a silicon-containing reducing agent to form a high-molecular-weight inorganic hybrid polymer composite structure; the surface activity can be further improved, and the demulsification effect is enhanced. The furan ring, quaternary ammonium salt, organic silicon, block polyether and molybdenum disulfide nanosheets in the molecular structure play a role together, so that the demulsifier is easier to dissolve natural emulsifiers such as colloid, asphaltene and solid powder adsorbed on an oil-water interface, and an interfacial film formed by the natural emulsifiers is prevented from hindering water drop coalescence; and the demulsifying agent can more easily and rapidly penetrate through an emulsion external phase to be dispersed on an oil-water interface so as to play a demulsification role.

The invention relates to a weak thixotropic, anti-settling and heat-conducting epoxy pouring sealant and a preparation method thereof, nano silicon dioxide, secondary amino silane, polyether glycol, isocyanate and other raw materials are adopted, a star-shaped branched anti-settling agent is prepared through a two-step process, and the star-shaped branched anti-settling agent is applied to a component A and a component B of the heat-conducting and flame-retardant epoxy pouring sealant. The component A and the component B can be uniformly mixed and stirred according to the mass ratio of 1: 1, vacuum defoaming is performed to obtain the heat-conducting flame-retardant epoxy pouring sealant, and during actual use, the pouring sealant can be injected into a device needing to be packaged and cured for 2 hours at the temperature of 120 DEG C, so that the heat-conducting flame-retardant epoxy pouring sealant is obtained. The star-shaped branched anti-settling agent prepared by the invention has a good anti-settling effect in the pouring sealant and effectively improves the high and low temperature cracking resistance of a cured product of the epoxy pouring sealant at the same time, and a packaging material formed by the cured product has the advantages of excellent sealing performance, long-term durability and stability and the like; the material can be widely applied to the fields of electronics, 5G, low-altitude aircrafts and the like.

The invention discloses a method for preparing a carbon product from waste heat of a graphitization box-type furnace, and relates to the technical field of carbon product manufacturing, and the method comprises the steps of carbon product pretreatment, in-furnace waste heat treatment, charging, calcination, waste heat calcination and carbon product post-treatment. The method has the advantages that after graphitization is completed, waste heat in the box-type furnace has a huge utilization value, a ventilation system in the furnace is accurately controlled, the constant temperature can be maintained, it is ensured that the waste heat uniformly acts on the carbon products, the atmosphere in the furnace can be effectively adjusted, and the carbon products are prevented from being burnt in the graphitization box-type furnace. According to the method, waste heat is utilized for calcination, the quality of the carbon products is further improved, energy consumption can be greatly reduced, the green and environment-friendly production target is achieved, meanwhile, the production period is shortened, the production efficiency is improved, and enterprises can produce more high-quality carbon products within shorter time.

The invention discloses an iron-based MOFs composite electrode and application thereof. The preparation method comprises the following steps: firstly preparing Cu-coated Fe-ZIF powder in a coprecipitation manner, then preparing Fe2O3-coated Cu-coated Fe-ZIF powder by a hydrothermal reaction, step-by-step ultrasonic and vacuum arc method, and then fusing with S at high temperature by a hot melting method; and preparing the active material Fe2O3 (at) Cu (at) Fe-ZIF (at) S for the iron-based MOFs composite electrode. The Fe-ZIF material is selected as a metal frame to coat the surface of Cu, the Fe-ZIF material and Fe oxide are mixed, calcined and subjected to a direct-current vacuum arc method to synthesize the wooden-stick-shaped nanosphere particles, the defect concentration in a Fe2O3 structure can be effectively increased under the synergistic effect of the advantages of Cu-coated Fe-ZIF components, more loading space is provided for subsequent components such as sulfur, and the Fe-coated Fe-ZIF composite material has a good application prospect. The sulfur loading effect is improved, the sulfur utilization rate is improved, the volume change is relieved, and the battery performance is further improved.

The utility model belongs to the technical field of carbon fiber production equipment, and discloses a large-tow carbon fiber in-situ surface modification device. The device comprises a large-tow precursor frame, a bundling ring, a large-tow conveying roller set, a large-tow heating roller set, a carbon fiber surface oxidation heating loop, an in-situ modifier dipping spraying plate, a reaction furnace and a large-tow collecting roller set which are sequentially connected from front to back, and then the large-tow precursor frame, the bundling ring, the large-tow conveying roller set and the large-tow heating roller set are sequentially connected. The large-tow carbon fibers jointly pass through a large-tow precursor frame, a bundling ring, a large-tow conveying roller set, a large-tow heating roller set, a carbon fiber surface oxidation heating loop, an in-situ modifier dipping spraying plate, a reaction furnace and a large-tow collecting roller set in sequence. Through multi-aspect structural improvement, the structure of the surface modification device is simplified, the tensile strength and interlaminar shear strength of the carbon fiber composite material are effectively enhanced, the problems of insufficient reinforcement and low production efficiency of the original carbon fiber composite material are solved, and advanced manufacturing of the high-performance large-tow carbon fiber composite material is promoted.

The application discloses a kind of plasma jet array devices for large size epoxy surface modification, including frame, tank, gas cylinder for loading inert gas, aperture network, high voltage power supply and metal insert;Tank and metal insert are fixed on frame, tank is flat tank and its slot is formed with jet airway for placing and fixing epoxy insulation, the bottom and side of tank are provided with jet spout arranged in array, jet spout is connected by gas inlet pipe, gas inlet pipe is arranged in the inside of side plate and bottom plate of tank;Aperture network is connected on jet spout and connects high voltage power supply, tank is grounded by wire;Metal insert is inserted above epoxy insulation, metal insert is grounded by wire.The application also discloses the use method applied to the above device.Adopting the application, the surface of large size epoxy insulation can be quickly and uniformly modified, and the charge release capacity is improved.

There is provided a technology that enables the production of a pulp molded product having an excellent surface property. The pulp molded product includes a surface that has a region with an arithmetic average roughness Ra of 50 µm or less. A method of producing a pulp molded product includes: preparing a slurry that contains pulp having an average fiber length of less than 3.0 mm and water; depositing the pulp on a paper-making mold having a solid shape to form a pulp layer; dehydrating the pulp layer to obtain an undried intermediate molded product; and heating the undried intermediate molded product while sandwiching the intermediate molded product between a male mold and a female mold and applying pressure to the sandwiched intermediate molded product.

The application discloses a nitrogen-doped carbon-coated three-metal catalyst and a preparation method and application thereof, and belongs to the field of catalyst preparation and application. The method adopts sucrose, melamine and metal salt as low-cost raw materials, and forms an alkaline environment with the assistance of sodium hydroxide. In the environment, melamine is hydrolyzed into cyanuric acid, which is complexed with sucrose metal ions to form a stable supramolecular aggregate precursor containing metal, and then realizes effective encapsulation of the metal in a high-temperature pyrolysis process. The synergistic effect of the three metal elements Co, Ni and Zn significantly improves the performance of the catalyst, so that CoNiZnO@NC-600 not only exhibits high conversion rate (98.4%) and selectivity (99%) in the reaction of hydrogenation conversion of furfural to furfuryl alcohol, but also has excellent cycle stability, thereby providing a new efficient method for the hydrogenation conversion of biomass-derived compounds.

Provided is a polyamide resin composition which contains a semi-aromatic polyamide (A), a polyolefin (B), and a fatty acid metal salt (C), satisfies conditions [1]-[5], has excellent retention stability, can suppress pressure increase during extrusion molding, and has excellent heat resistance. The extrusion-molded body has excellent surface properties, flexibility, chemical resistance, and impact resistance in a wide temperature range. [1] The mass MA of the component (A) and the mass MB of the component (B) in the composition are MA / MB = 60 / 40 to 85 / 15; [2] the component (C) in the composition is 0.05-0.5 mass% of the total mass of the components (A) and (B); [3] The terminal amino group concentration [NH2] of component (A) is 45-80 [mu] eq / g, and the terminal carboxyl group concentration [COOH] ([mu] eq / g) of [NH2] and component (A) is 2 < [NH2] / [COOH] < 5. [4] the content ratio of functional groups formed from unsaturated epoxide in component (B) is < = 200 mol / g; [5] The ratio of copper atoms derived from the copper-based stabilizer in the composition is less than or equal to 200 ppm by mass.