87results about How to "Uniform and dense coating" patented technology

The invention provides a grapheme-coated sulfur/porous carbon composite material and a preparation method thereof, and relates to a grapheme-coated sulfur/porous carbon composite material used as the positive electrode material of a lithium-sulfur secondary battery and a preparation method thereof. The grapheme-coated sulfur/porous carbon composite positive electrode material provided by the invention can be used for solving the technical problem that the existing grapheme-coated sulfur-containing composite material used as the positive electrode material of a lithium-sulfur battery is low in electrochemical properties. The external surface of each of the particles of the grapheme-coated sulfur/porous carbon composite material provided by the invention is evenly covered with a graphene sheet, and a graphene conductive network is formed between the particles; the obtained grapheme-coated sulfur/porous carbon composite material has a hierarchical core-shell structure. The preparation method of the grapheme-coated sulfur/porous carbon composite material is obtained by adding a sulfur/porous carbon composite material to graphene slurry which is stable for a long time and in which graphene sheets are highly dispersed in water for mixing and coating. The positive electrode material has high specific capacity, long cycle life and excellent high-rate performance. Besides, the grapheme-coated sulfur/porous carbon composite material can be used as the positive electrode material of a lithium secondary battery.

The invention relates to a polyvinylpyrrolidone modified graphene coated sulfur/porous carbon composite anode material and a preparation method thereof, which relates to a sulfur/carbon composite material applied to a lithium-sulfur secondary battery anode material and a preparation method of the composite material, and solves the technical problem of the existing lithium-sulfur battery anode material graphene-coated sulfur-containing composite material that the electrochemical property is low. The polyvinylpyrrolidone modified graphene coated sulfur/porous carbon composite material is characterized in that the outer surface of a sulfur/porous carbon composite material particle is uniformly coated with a polyvinylpyrrolidone modified graphene slab layer, a graphene conductive network is formed between every two adjacent particles, and a grading core-shell structure is formed. The preparation method comprises the steps of adding the sulfur/porous carbon composite material into graphene slurry modified by the polyvinylpyrrolidone, and mixing the sulfur/porous carbon composite material with the graphene slurry, and coating the sulfur/porous carbon composite material with the graphene slurry modified by the polyvinylpyrrolidone. The anode material is high in specific capacity, long in cycle life and good in high-rate performance.

The invention discloses a multifunctional nanosized ferrite composite material with a double-shell structure and a preparation method of the multifunctional nanosized ferrite composite material. The composite material is prepared from spinel type nanosized ferrite as a nucleus, silicon dioxide as an intermediate layer and titanium dioxide as an outer shell layer. With adoption of the intermediatelayer, on one hand, chemical stability of a magnetic nucleus of the nanosized ferrite can be improved and the applicable range of the material can be extended, and on the other hand, influence of themagnetic nucleus on performance of the outer shell layer is prevented; the outer shell layer not only can endow the material with special characteristics of light, electricity, catalysis and the like,but also can be integrated with the characteristics of the magnetic nucleus, so that multifunctional nanoparticles are obtained. The preparation method mainly comprises steps as follows: a three-stepsol-gel method for material preparation, surface modification with function of improving dispersity and coating effect, ball milling, heat treatment process under atmosphere control and the like. Thenanosized ferrite particles with the double-shell structure have the advantages of relatively good dispersity, high specific surface area, tight combination of the shell layer and the nucleus; meanwhile, the application field of the material can be further expanded by modification of the shell layer.

The invention relates to a surface modified product of an acicular wollastonite crystal and a production method thereof. The product is micro-nano composite powder by coating a nanometer calcium carbonate crystal on the surface of the acicular wollastonite fiber crystal. The method comprises the following steps: firstly, preparing an active lime milk solution and an acicular wollastonite fiber solution; compounding the two solutions into a suspension; adding a crystalline directing agent to the suspension and filling CO2 gas for a coating reaction so that the nanometer calcium carbonate crystal gradually grows on the surface of an acicular aedelforsite fiber, and the micro-nano composite powder by coating a nanometer calcium carbonate crystal on wollastonite is obtained; and coating a layer of coupling agent on the surface of the micro-nano composite powder to obtain the acicular wollastonite fiber crystal-nanometer calcium carbonate crystal-coupling agent composite powder material. The product keeps the superior characteristics of the acicular wollastonite crystal and the nanometer calcium carbonate crystal, improves the surface energy and the chemical activity of wollastonite composite particles and can be well stuck with organic polymers so as to form a favorable interface and improve the bonding force between fillings and basal bodies, such as plastics, pulp, and the like.

The invention discloses a method for plating a magnesium alloy based on an ionic liquid plating solution, relates to the technical field of magnesium alloy surface treatment, and in particular relates to the plating of the pre-plated magnesium alloy in a plating solution in which deep eutectic solvent serves as a solvent. A plated layer obtained through the method is uniform and compact and can be firmly combined with a matrix, and the whole process has the characteristics of simple process, environmental friendliness and the like.

The invention relates to the field of wave absorbing materials, in particular to a composite wave absorbing material and a preparation method thereof. The composite wave absorbing material is characterized in that the surface of each of MXene layers is coated with a ferrite, and the different MXene layers and the ferrites on the surfaces of all the layers jointly form a sandwich structure. The composite wave absorbing material and the preparation method thereof provided by the invention have the benefits that MXene is prepared by adopting a chemical etching process, the ferrites prepared by adopting a hydrothermal preparation process are compounded with the MXene so as to grow in situ on the surface of MXene powder, the degree of integration between the ferrites and the MXene powder is high, and the coating is uniform and compact; the prepared MXene/ferrite composite wave absorbing material with the sandwich structure is light in density, high in strength, adjustable in dielectric constant and excellent in wave absorbing performance. In addition, the preparation method is simple, used equipment is simple, the process is stable, the production efficiency is high, the cost is reduced, the compactness and the uniformity of the material are good.

The invention discloses an electrochemical method for preparing a HA/ZrO2 (hydroxylapatite/zirconia) gradient coating on the surface of medical titanium. The method comprises the following steps of: carrying out electro-deposition in an electrolytic cell with a three-electrode system, wherein the medical titanium to be coated is a working electrode; carrying out electro-deposition to obtain a Zr (OH) 4 coating in a zirconium oxynitrate solution with certain concentration and pH value, wherein the deposition current is 20mA, and the deposition time is 600s; then, depositing a CaHPO42H2O coating in an electrolyte which has certain concentration and pH value and consists of calcium nitrate and ammonium dihydrogen phosphate, wherein the deposition current is 1.5mA, and the deposition time is 900s; and finally, carrying out vacuum sintering on the obtained coating materials, and raising the sintering temperature to 650 DEG C at a heating rate of 10 DEG C/min, then preserving the heat for two hours, and subsequently cooling the coating materials with a furnace so as to obtain the HA/ZrO2 composite coating. The electrochemical method of the invention has the advantages that: the ingredients of the coating are deposited on a substrate in the form of ions, so that the bonding strength of the HA/ZrO2 gradient coating and the Ti substrate is improved greatly; and the anti-corrosion and simulated body fluid experiment shows that even the HA on the surface is dissolved completely due to the biological effect, the remaining ZrO2 coating still has good anti-corrosion performance and certain biocompatibility.

The invention relates to a nanometer oxide coated lithium titanate negative electrode material of a lithium battery, and a preparation method for the negative electrode material, and belongs to the technical field of negative electrode materials of lithium batteries. The negative electrode material comprises the following raw materials in percentage by weight: 1 to 10 percent of mixed oxide, 40 to 60 percent of lithium titanate, 1 to 8 percent of binder, 0.5 to 2 percent of surfactant and 20 to 57.5 percent of deionized water. The lithium titanate negative electrode material is used in combination of spherical and rodlike oxides to serve as coating particles; and the formed oxide coating has the characteristic of compact and uniform coating layer and can cover the surfaces of the lithium titanate particles well.

The invention concretely discloses a nickel-coated graphite electric conduction powder used for electric conduction rubber and a manufacturing method of the nickel-coated graphite electric conduction powder. The nickel-coated graphite electric conduction powder used for the electric conduction rubber comprises 50-80% of nickel and 20-50% of graphite. The manufacturing method of the nickel-coated graphite electric conduction powder used for the electric conduction rubber mainly includes the four steps of oil removing treatment on graphite powder, acid etching and roughening treatment on the graphite powder, surface activating treatment on the graphite powder and chemical nickel plating. The nickel-coated graphite electric conduction powder has the advantages of pure nickel and pure graphite, is low in cost and not prone to rusting and further can improve the mechanical strength of the electric conduction rubber material. The chemical nickel plating method is easy to operate and simple in technology, plated layers are even and compact, the throwing power is high, plating can be performed on particles in any shape, the covering power is high, and the even, fine and dispersed composite powder can be manufactured.

The invention belongs to the technical field of printed circuit boards and discloses a rapid pre-treatment method for copper electroplating on an aluminum substrate. The method mainly comprises the following steps of alkaline de-oiling, acid etching, activating treatment, chemical nickel plating and copper electroplating. First, alkaline de-oiling and acid etching are carried out on the aluminum substrate to remove a surface oxide film and increase roughness. By controlling palladium solution components, hydrochloric acid content and activating time, the chemical nickel plating rate is greatlyincreased, plating is rapidly started, and a nickel plating with great bonding force can be stably obtained. By controlling copper plating solution components, current density and electroplating time, a uniform and dense copper plating with great bonding force is prepared. The preparing method for the copper plating on the aluminum substrate is high in stability, zinc dipping pretreatment is notneeded, the production technology is simplified, the environment is prevented from being polluted by a plating solution, and the service life of the plating solution is prolonged. By using the method,the obtained copper plating has the characteristics of evenness, density, great bonding force and the like and is suitable for industrial large-scale stable production.

The invention discloses a multi-layer composite mold coating for aluminum-lithium alloy sand casting and a coating method thereof. The multi-layer composite coating comprises an alcohol-based graphitecoating, a low-concentration hexachloroethane coating and a high-concentration hexachloroethane coating which are sequentially arranged. The coating method adopts a combination manner of brushing andspraying, the alcohol-based graphite coating is brushed by adopting a brushing method, and the low-concentration hexachloroethane coating and the high-concentration hexachloroethane coating are sprayed by adopting a spraying method, and waited for natural volatilization and drying of the low-concentration hexachloroethane coating and the high-concentration hexachloroethane coating after the tlcohol-based graphite coating is ignited and dried. According to the coating, the hexachloroethane coating is added to react with aluminum lithium alloy melt to form an air film to prevent the alloy liquid from being in contact with a casting mold, and the problem that the high-activity lithium element is easy to react with a binder, a suspending agent, an auxiliary agent and the like in the sand moldand the coating in the aluminum lithium alloy sand mold casting process is solved. Meanwhile, the hexachloroethane coating can also generate a refining effect on the melt, deslagging and degassing are carried out, and the surface quality of the aluminum lithium alloy casting can be greatly improved.

The invention discloses an anti-corrosion and heat-conducting composite coating on the light-alloy radiator surface, a preparation method of the anti-corrosion and heat-conducting composite coating and a light alloy radiator with the anti-corrosion and heat-conducting composite coating. The composite coating comprises a metal oxide layer formed by oxidizing light alloy radiator base metal in situ and an electrophoretic paint film layer provided with carbon nano-particles dispersedly distributed and located on the metal oxide layer in a covering manner. The preparation method comprises the steps that (1), micro-arc oxidation is conducted, and the metal oxide layer formed by oxidizing the light alloy radiator base metal in situ is formed on the surface of the light alloy radiator base material; and (2), electrophoretic deposition is conducted, and the layer of electrophoretic paint film is deposed on the surface of the metal oxide layer. The composite coating has the beneficial effects of being uniform, dense, excellent in anticorrosion performance, good in thermal conductivity, ultralong in service life and the like. The preparation method is environmentally-friendly, safe, reliable, good in repeatability, capable of achieving automatic large-batch industrial production with low cost and short processes.

The application discloses a zirconium carbide-silicon carbide composite powder material, wherein a molar ratio of components in the zirconium carbide-silicon carbide composite powder material satisfies ZrC:SiC=1:0.1-1:10; a preparation process is easy, the cost is low, and the process is easy to control; and the obtained zirconium carbide-silicon carbide composite powder material has the advantages of submicron level, uniform composition and high purity.

The invention discloses a stain-resistant waterborne coating which comprises raw materials in parts by weight as follows: 53-60 parts of a polytetrafluoroethylene emulsion, 1-2 parts of molybdenum disulfide, 0.1-0.3 part of cerium tetrafluoride, 1-2 parts of 2, 6- butylated hydroxytoluene, 0.4-1 part of 2-hydroxy-4-n-octoxy-benzophenone, 8-10 parts of silicon whisker, 0.8-2 parts of bisphenol A phosphite, 1-2 parts of alumina powder, 1-2 parts of alkyl phosphate diethanolamine salt, 1-2 parts of alkylolamide, 4-6 parts of maleic anhydride-acrylic copolymer, 5-10 parts of calcium silicate, 4-6 parts of an auxiliary and 10-25 parts of deionized water. The waterproof coating has good stain resistance, the adhesion on a substrate is high, the coating is stable, the drying speed is high, the coating is compact and uniform, the appearance is flat, the applicability is high, and the application range is wide.

The invention discloses silicate type fluorescent powder as well as a device and process for coating an oxide diaphragm film on the surface of the fluorescent powder. A fluorescent powder special deposition chamber is arranged in the device and has a single-layer or multi-layer structure, wherein each layer of the deposition chamber consists of a fluorescent powder deposition area (1) and air passages (2) bestrewn around the deposition area (1), and the air passages are pipelines for feeding and discharging a precursor and carrier gas for atomic layer deposition. The invention realizes the aim of coating a diaphragm film layer at the periphery of the fluorescent powder by using an atomic layer deposition (ALD) technology to improve the performance of the fluorescent powder. The deposition chamber special for coating the fluorescent powder is invented on the basis of the ALD technology, and the process for atomic layer deposition is further improved to meet requirements for coating the fluorescent powder.

The invention discloses an interface modification method of a lithium battery composite single crystal positive electrode material. The method comprises the following steps: 1) preparing an acrylonitrile monomer solution, adding a photoinitiator into the acrylonitrile monomer solution, atomizing the monomer solution, spraying the atomized monomer solution on the surface of the single crystal positive electrode material, and placing the treated positive electrode material in a mechanical fusion machine for fusion; 2) in a mechanical fusion machine, carrying out the polymerization reaction on the fused material under the irradiation of an ultraviolet lamp, and uniformly coating the surface of the positive electrode material with an ionic liquid monomer; 3) after the polymerization reaction is finished, placing the polymer-coated positive electrode material in a tubular furnace, and carrying out heat treatment at 150-300 DEG C to obtain the composite single crystal positive electrode material with the modified interface. After interface modification, the surface of the single crystal positive electrode is uniformly coated with the polymer, so that the contact area of the battery positive electrode material and the electrolyte can be reduced, side reaction and corrosion are avoided, the cycle life of the single crystal positive electrode material is prolonged, the rate capability of the single crystal positive electrode material is improved, and the single crystal ternary positive electrode material with excellent comprehensive performance for the lithium battery is obtained.

The invention discloses flame-retardant, antibacterial and transparent super-amphiphobic paint and a preparation method and application thereof. The flame-retardant, antibacterial and transparent super-amphiphobic paint is prepared by the following steps: firstly preparing inorganic/organic nanoparticles modified by a nitrogen-containing positive ion silane coupling agent, and dispersing the inorganic/organic nanoparticles along with flame retardant particles and a fluorine-containing silane coupling agent in a solvent and reacting. By a spray-coating, brush-coating or dip-coating method, the paint is applied on the surface of a metallic base material, an inorganic base material or an organic polymer base material. The use amount of the coating obtained is less. It can be effectively ensured that characteristics such as color, texture, pores, air permeability, etc. of the surface of the base material are unchanged, and excellent and stable super-amphiphobic property, flame retardant property and antibacterial property can be obtained. Meanwhile, the preparation is simple, the raw materials are cheap and easily available, and no toxic organic solvent is used. The preparation condition is mild, and the preparation is carried out at normal temperature and in an ordinary state and is environmentally-friendly. The preparation cost is low. Thus, the method is suitable for large-scale production and is good for industrial application and promotion.

The invention belongs to the technical field of a graphene masterbatch, and provides a graphene masterbatch for thermally conductive and insulating nylon plastic and a preparation method thereof. Themethod comprises the following steps: forming a gel-coated graphene microchip by hydrolysis of aluminium isopropoxide, and then performing steps of atomizing drying, pulverizing and calcining to obtain alumina-coated graphene composite particles, mixing the alumina-coated graphene composite particles with a surfactant, a nylon carrier, and a dispersing agent, and performing extrusion granulation to obtain the graphene masterbatch. Compared with the conventional method, the graphene masterbatch prepared by the invention forms an aluminum oxide coating layer on the graphene microchip, which canavoids the direct contact of the graphene microchip and a silica gel matrix, the graphene masterbatch has excellent thermal insulation effect, and does not use an organic solvent harmful to the environment, the method has a simple preparation process, is environmentally friendly, and is easy to popularize.

The invention relates to water-based lost-foam casting coating. The water-based lost-foam casting coating consists of the following raw material components in parts by weight: 1.6-2.2 parts of latex powder, 0.2-0.5 part of xanthan gum, 3-4 parts of attapulgite, 0.3-1 part of CMC, 1-1.6 parts of curing starch, 50-60 parts of quartz powder, 80-100 parts of bauxite, and 0.010-0.015 part of a penetrating agent. Compared with the prior art, the water-based lost-foam casting coating has the beneficial effects that: the formula design is reasonable, the preparation process is fine, finished product performances are stable, and the economic benefits and the social value are good.

The invention provides a preparation method of a surface coating of a zirconium alloy cladding, and further provides the surface coating. The preparation method is characterized in that a carbide target material is adopted to form a carbide coating on a zirconium alloy matrix. The preparation method comprises the steps that mechanical grinding and polishing treatment are carried out on the zirconium alloy matrix; the zirconium alloy matrix is placed in a solution composed of acetone and deionized water to be subjected to ultrasonic cleaning; the zirconium alloy matrix is subjected to low-temperature drying treatment; the carbide target material is subjected to sputtering sintering through a radio frequency magnetron sputtering method, sputtering power is 1200 W or below, the bias range is0 V to 1000 V, and a carbide coating is formed; the zirconium alloy matrix on which the carbide coating is formed is taken out of a magnetron sputtering instrument, and thermal treatment is carried out under an argon environment for 1 h to 3 h at the temperature of 500 DEG C to 700 DEG C; and the zirconium alloy cladding on which the carbide coating is formed is subjected to inspection. Accordingto the preparation method of the surface coating of the zirconium alloy cladding, corrosion resistance and oxidization resistance of the zirconium alloy cladding can be improved.

The invention relates to a chemical immersion tin plating solution and a preparation method thereof. The chemical immersion tin plating solution is composed of tin salt, an accelerant, a wetting agentand a stabilizer, wherein the mass concentration of the tin salt is 5-20 g/L, the mass concentration of the accelerant is 30-200 g/L, the mass concentration of the wetting agent is 0.1-0.5 g/L, the mass concentration of the stabilizer is 50-170 g/L. Under reasonable concentration proportioning and the synergistic effect of all the components, the chemical immersion tin plating solution is very stable, the plating layer is uniform, compact and semi-bright, moreover, the used working temperature is not high, the temperature is 35-45 DEG C, plating is carried out for 10-15 minutes, the thicknessof the plating layer can reach about 1.5-2 microns, and the plating layer is good in weldability.

The invention in particular discloses an EVA (Ethylene Vinyl Acetate) master batch. The EVA master batch is prepared from the following raw materials in percentage by mass: 40 percent to 50 percent of EVA, 30 percent to 40 percent of luminous powder, 1.0 percent to 1.5 percent of kaolin, 2.0 percent to 3.0 percent of a dispersant, 2.5 percent to 4.0 percent of an anti-ageing agent and 10 percent to 12 percent of a compound organic coating agent, wherein the luminous powder is alkaline earth aluminate system long afterglow luminous powder, and the grain size is 12mu m to 20mu m. According to the EVA master batch, a maleic anhydride organic ligand is introduced to the surface of the luminous powder, and the luminous powder more uniformly and densely coats the surface of the luminous powder by utilizing a gemini surfactant, so that contact between the luminous powder and external moisture or metal is reduced, and a product does not turn black; meanwhile, the combination firmness of the luminous powder and the organic ligand is improved, the hydrolyzing resistance of the product and the compatibility between the product and the EVA are greatly improved, and the influences on luminous performance of the luminous powder are very small.