863 results about "Ultrasonic dispersion" patented technology

The invention discloses forming equipment for ceramic guide rail production and a forming method thereof, and relates to the technical field of ceramic guide rail forming, the forming equipment comprises a conveyor, a forming processing box and a raw material box, and the top of the conveyor is provided with the forming processing box. The ultrasonic disperser arranged in the raw material box is combined with the constant-temperature heating sleeve and the viscosity sensor of the conveying pipe, uniform flowing and accurate metering injection of slurry are guaranteed, in the forming stage, the vacuum pump actively pumps out bubbles in a cavity through the micropore array, pores are further eliminated in cooperation with the high-frequency micro-vibration device, the compactness and surface smoothness of the guide rail are greatly improved, and the production efficiency is improved. The cooling runner realizes gradient cooling and curing through closed-loop control of a temperature sensor and a temperature regulator, ceramic cracking deformation is effectively inhibited, the rotary mold assembly supports multi-angle adjustment, nondestructive demolding of a complex structure is facilitated, the production period is shortened, the process stability, energy consumption control and equipment adaptation flexibility are further enhanced, and the production efficiency is improved. And the targets of high precision, low defect and batch production are achieved.

The invention relates to the field of optical protection materials, and provides a transparent film with laser eavesdropping prevention performance and a preparation method thereof.The transparent film is composed of surface-modified doped tungsten oxide nanosheets, amino-isocyanate bifunctional lithium niobate nanowires, urethane acrylate, an ultraviolet light absorber, a silane coupling agent, a dispersing agent and a flatting agent; the molybdenum-doped tungsten oxide nanosheets are obtained through silane coupling modification after hydrothermal synthesis, and the lithium niobate nanowires are prepared through a gradient modification process of hydrothermal synthesis-silane coupling-isocyanate grafting-phenol end capping. A modified nano material is uniformly dispersed in a resin matrix through an ultrasonic dispersion composite technology, and through blade coating forming, ultraviolet curing and constant-temperature and constant-humidity post-treatment, compared with the prior art, the scheme overcomes the problems that a traditional protective film is insufficient in optical transparency, laser eavesdropping prevention function and dynamic viscoelasticity, and is suitable for the field of high-end security and protection.

The invention relates to the technical field of electric wires and cables, discloses a high-elasticity waterproof cable based on blending of water-blocking powder and an elastomer, and aims to solve the problems that in the prior art, during long-term dynamic service, interlayer separation is easily caused by interfacial stress superposition, so that elasticity attenuation and waterproof barrier damage are caused, and the service life is affected. According to the invention, the sodium polyacrylate water-blocking powder is subjected to composite modification and is blended with an elastomer matrix, modified nano silicon dioxide is matched for dispersion, an inner and outer layer gradient insulation structure is designed, and ultrasonic dispersion, nitrogen protection steam cross-linking and other processes are combined; the cable is sequentially provided with the conductor layer, the conductor shielding layer, the gradient insulation layer, the insulation shielding layer and the sheath layer from inside to outside, interface stress concentration is reduced, interlayer combination stability is enhanced, and the cable can still keep excellent elastic recovery capability and waterproof barrier integrity under high-frequency torsion and repeated dry-wet cycles.

The invention discloses a high-oxygen-storage zirconium solid solution material and a preparation method, and belongs to the technical field of rare earth catalytic materials, and the method comprises the following steps: precursor preparation, ultrasonic dispersion, double-gradient precipitation, ultrasonic aging, solid-liquid separation, three-section roasting and furnace cooling. Through the synergistic effect of double-gradient precipitation and ultrasonic aging, coarse grains and non-uniform particle size distribution are avoided, and the material is not prone to abnormal growth of the grains and structural collapse in long-term high-temperature service. Meanwhile, according to the gradient roasting process, through step-by-step regulation and control of crystal densification and crystal lattice reconstruction, separation of a fluorite phase and a pyrochlore phase easily occurring in traditional low-temperature single-section roasting is reduced, a stable crystal phase structure is maintained, it is ensured that the material can still keep sufficient active surface and pore channel structures under the working conditions of high temperature and thermal shock alternation, and the performance of the material is improved. The oxygen storage capacity and the long-term durability of the catalyst carrier are obviously improved.

The invention discloses a graphene heat dissipation film and a preparation method thereof, and relates to the technical field of heat dissipation materials.The method comprises the steps that graphene powder and doped particles are mixed according to the mass fraction of 5-20%, deionized water is added to serve as a dispersion medium, 0.5-5% of a stripping auxiliary agent is added, treatment is conducted through high-speed shear dispersion and ultrasonic dispersion, and the graphene heat dissipation film is obtained. Uniform and stable modified graphene slurry is formed; coating the modified graphene slurry on a base material layer by layer according to a sequence from low thermal conductivity to high thermal conductivity, controlling the coating thickness by adopting a scraper or a spin coating process, and performing pre-drying treatment after coating each layer; the coated film is dried at the temperature of 80-200 DEG C, and the interlayer bonding strength is enhanced through chemical curing or thermocuring. Through innovative design of a modified graphene material and optimization of a multi-layer gradient structure, comprehensive improvement of thermal conductivity, mechanical properties and stability of the graphene heat dissipation film is realized.

The invention relates to the technical field of nano silver powder preparation, in particular to a preparation method of high-tap-density and high-purity silver powder. The problems that in the prior art, silver powder is insufficient in purity and low in tap density are solved. The method comprises the following steps: preparing silver nitrate into a solution, carrying out electrolytic pretreatment, and carrying out chemical reduction, coprecipitation and dissolution reduction to obtain a silver powder suspension; the silver powder suspension is subjected to physical vapor deposition, silver vapor is deposited on the surface of the silver powder under the action of argon, and silver powder particles are tightly arranged; preparing an electrolyte from silver nitrate and bismuth nitrate, and carrying out electrolytic refining; and finally, the high-tap-density high-purity silver powder is obtained through ultrasonic dispersion and supercritical fluid drying treatment. By strictly controlling the process sequence and parameters and utilizing the synergistic effect among the processes, impurities are effectively removed, the particle size distribution of nano silver powder particles is optimized, the purity and tap density of the nano silver powder are improved, and the application of the silver powder in conductive materials is optimized.

A method for detecting circularity of silicon carbide micro powder relates to the technical field of silicon carbide detection, and comprises the following steps: S1, turning on a flowing particle imager, preheating and then carrying out background detection; s2, adding standard particles into the sample pool, and enabling the flowing particle imager to perform automatic focusing; s3, adding the prepared silicon carbide micro powder sample into a sample pool, and detecting by using a flowing particle imager; and S4, storing the detection result, checking the silicon carbide micro powder particle image, and recording the detection result. The preparation of the silicon carbide micro-powder sample comprises the following steps: S31, adding the dried silicon carbide sample into a dry and clean beaker; s32, sequentially adding an impregnating compound, a dispersing agent and deionized water into the beaker; s33, carrying out ultrasonic dispersion; and S34, taking out the uniformly mixed sample. The method can solve the technical problem of detection failure caused by easy agglomeration of the silicon carbide sample when the flowing particle imager is used for detecting the circularity of the silicon carbide micro powder.

The invention relates to the technical field of engineering plastics, and discloses a polydicyclopentadiene / carbon nanofiber composite material and a preparation method and application thereof.The method comprises the steps that DCPD, ENB and MNA are mixed to be uniform, CNF is added and subjected to ultrasonic dispersion, a Grubbs second-generation catalyst is added and subjected to ultrasonic dispersion after freezing, finally, mixed liquid is poured into a mold, and the polydicyclopentadiene / carbon nanofiber composite material is obtained. And heating and curing to obtain the high-performance PDCPD / CNF composite material. According to the preparation method, the interaction between PDCPD and CNF can be remarkably improved, so that the mechanical property of the composite material is improved, the used raw material DCPD has low viscosity and high reaction activity, and rapid forming can be realized; meanwhile, the whole production process of the modified PDCPD composite material is green and environment-friendly, the process is simple, complicated chemical modification is not involved, and the feasibility of large-scale industrial production is achieved.

The invention relates to the technical field of synthesis and preparation of nano materials, in particular to a method for preparing tin dioxide powder, which comprises the following steps: S1, preparing a 0.1-5 mol / L tin salt solution, adding a compound additive into the tin salt solution, and carrying out ball milling treatment after ultrasonic dispersion to obtain a pretreated tin salt solution; s2, freezing and freezing the pretreated tin salt solution in an ultralow-temperature environment to obtain a frozen sample; s3, transferring the frozen sample into a vacuum freeze dryer for dehydration treatment to obtain solid powder; and S4, carrying out high-temperature calcination on the solid powder to obtain tin dioxide powder. Zero sewage discharge is achieved in the preparation process, the problem of sewage discharge and treatment of traditional liquid-phase powder preparation is solved, meanwhile, the phenomenon of sintering agglomeration accompanied by traditional solid-phase calcination can be avoided, high-quality superfine tin dioxide powder preparation is achieved, the method is simple and safe in process, and industrial large-scale production and preparation are easy to achieve.

The invention relates to preparation and photocatalytic application of a three-component covalent organic framework photocatalyst. The invention aims to solve the problems of low visible light utilization rate, low efficiency of photocatalytic synthesis of hydrogen peroxide and complex synthesis process of a multi-component covalent organic framework material in the synthesis of a high-performance photocatalyst in the prior art. The method comprises the following steps: dispersing two reaction monomers into an organic solvent to form a mixed solution, adding a catalyst into the mixed solution, then adding the third monomer, carrying out ultrasonic dispersion, carrying out a heating reaction for a period of time, cooling to room temperature, and carrying out solid-liquid separation to obtain a solid; and carrying out solid separation, collecting the solid, washing and drying to obtain the three-component covalent organic framework material. The prepared TTBTP-1 three-component covalent organic framework photocatalytic material is high in crystallinity and good in catalytic effect and is superior to a two-component photocatalyst, the preparation method is simple, through the design thought that p-phenylenediamine is adopted as a linker to connect two monomers with different structures, the thought is broadened for the design of a novel COF structure and function, and the application prospect is broad. The method has important research significance.

The invention provides a preparation method and application of a carbon nanotube sponge / liquid metal composite material. The preparation method of the carbon nanotube sponge / liquid metal composite material comprises the following steps: 1) preparing a porous carbon nanotube sponge by adopting a chemical vapor deposition method, and removing surface impurities through plasma cleaning to form a hydrophilic oxygen-containing group; 2) placing the liquid metal gallium-indium eutectic in an ethanol solution, and carrying out ultrasonic dispersion to prepare a uniform liquid metal dispersion liquid; 3) immersing the pretreated carbon nanotube sponge into the liquid metal dispersion liquid, and placing in vacuum to realize vacuum-assisted impregnation; and 4) drying the soaked carbon nanotube sponge in a drying oven at 40 DEG C, and compacting the composite material through rolling operation. According to the application of the carbon nanotube sponge / liquid metal composite material in the field of electromagnetic shielding, the conductivity and the electromagnetic shielding effectiveness of the material are remarkably improved, and the carbon nanotube sponge / liquid metal composite material has a wide application prospect.

The invention discloses a method for stripping an attenuation layer of a waste lithium ion positive electrode material and recycling of the attenuation layer, and belongs to the technical field of lithium ion batteries, and the specific method comprises the following steps: pretreating the waste lithium ion positive electrode material, dispersing the pretreated waste lithium ion positive electrode material into a solvent, and performing ultrasonic dispersion vibration to obtain the attenuation layer of the waste lithium ion positive electrode material; and then putting the material subjected to ultrasonic dispersion vibration into a ball milling tank, adding a ball milling medium, carrying out ball milling, taking out the material subjected to ball milling, carrying out ultrasonic dispersion vibration again, and then filtering, drying and screening to obtain the recycled positive electrode material. The method is simple in process, the adaptability of the waste positive electrode material is high, and the utilization efficiency of the waste positive electrode material is finally improved.

The invention relates to the technical field of floor slab concrete, and discloses aerated concrete applied to sound insulation and heat preservation of a floor slab and a preparation method of the aerated concrete aiming at the problems that an existing sound insulation floor slab containing the aerated concrete is poor in structural stability, namely the sound insulation effect and the long-term effect of mechanical properties are poor and the like. Comprising 30-40 parts of fly ash, 25-35 parts of sand, 15-20 parts of ardealite, 10-15 parts of quick lime, 5-8 parts of silicon-aluminum porous microspheres, 3-5 parts of slaked lime, 1-2 parts of Fe3O4-polypropylene fiber and 0.2-0.5 part of aluminum powder. The preparation method of the silicon-aluminum porous microspheres comprises the following steps: mixing a silicon source, an aluminum source and a surfactant, and uniformly stirring to obtain silicon-aluminum homogenate; and adding nano titanium dioxide, carrying out ultrasonic dispersion and freeze drying, transferring into a heating furnace, and heating and calcining to obtain the silicon-aluminum porous microspheres. The supporting and strengthening effects on pores are realized through gas production reaction and the like in the material, so that the structural strength and durability of the aerated concrete are improved.

The invention discloses an intelligent modified atmosphere packaging film with gas selectivity and pH / humidity double response as well as a preparation method and application of the intelligent modified atmosphere packaging film. The preparation method comprises the following steps: mixing thymol emulsion and graphene oxide dispersion liquid, and stirring and reacting at room temperature in a dark place to prepare graphene oxide-thymol; the preparation method comprises the following steps: dissolving chitosan in an acetic acid aqueous solution, then adding graphene oxide-thymol and a plasticizer, and carrying out ultrasonic dispersion treatment to form a film-forming solution; and carrying out film forming treatment on the film forming solution by adopting a casting method to prepare the intelligent modified atmosphere packaging film with gas selectivity and pH / humidity double response. The prepared intelligent modified atmosphere packaging film can be modified automatically, is uniform and stable in structure, high in encapsulation efficiency, close in coordination, good in antibacterial and antioxidant activity and excellent in mechanical property and gas barrier property, can realize selective adsorption of gas, controls release of thymol by responding to changes of the pH value and humidity in the environment, and has a good application prospect. The method has a good application prospect in the field of fruit and vegetable preservation.

The invention discloses a nano graphene oxide hybridized polyacrylamide high-temperature-resistant fracturing fluid and a preparation method thereof.The preparation method comprises the steps that nano graphene oxide is added into water according to the proportion, in order to avoid the agglomeration phenomenon, the nano graphene oxide is placed in an ultrasonic dispersion machine to be dispersed for 15 min under the condition that the ultrasonic power is 19.86 Hz, and it is guaranteed that the nano graphene oxide is evenly dispersed in an aqueous solution; and sequentially adding the clay stabilizer, the gel breaker, the cleanup additive, the polyacrylamide, the pH regulator and the cross-linking agent according to the formula to prepare the cross-linked gel fracturing fluid.

The invention provides a preparation method of a concrete pavement curing agent, and belongs to the technical field of concrete. The preparation method comprises the following steps: preparing a modified beta-cyclodextrin solution, preparing a polyurethane emulsion 1, preparing a polyurethane emulsion 2, and mixing. The mixing method comprises the following steps: adding potash water glass into deionized water, sequentially adding a water-based stabilizer, a polyurethane emulsion 1, a polyurethane emulsion 2 and decyl glucoside in a stirring state, and then transferring the mixture into an ultrasonic oscillator for ultrasonic dispersion for 25-35 minutes to obtain the concrete pavement curing agent. The effective water retention rate of the curing agent is 92-96%, the compressive strength ratio is 95-97% in 7d and 98-99% in 28d, the abrasion loss is 0.7-1.1 kg / m < 2 >, the solid content is 27-30%, and the drying time is 1.1-1.4 h.

The invention discloses a high-strength photovoltaic welding flux for a photovoltaic welding strip and a preparation method of the high-strength photovoltaic welding flux, and belongs to the technical field of energy conservation and environmental protection. According to the solder, the Sn-Zn-Bi alloy is used as a matrix, and the performance is comprehensively improved by introducing a dual nano reinforced phase of the multi-walled carbon nanotubes and the nano nickel particles. The preparation method comprises the steps of matrix alloy melting, a hydrothermal method, a liquid phase reduction method, ultrasonic dispersion, gas atomization powder preparation, silane coupling agent surface modification, scaling powder compounding, reflow soldering and the like. The obtained solder has excellent comprehensive performance, excellent thermal fatigue resistance and long-term reliability. The welding flux is suitable for interconnection welding of a main grid, a fine grid and a welding strip of a crystalline silicon photovoltaic cell, and provides technical guarantee for the service life of a photovoltaic module more than 25 years.

The invention relates to the technical field of photovoltaics, and discloses photovoltaic conductive silver-coated copper micro powder and a preparation method thereof, and the preparation method aims to solve the problem that performance and cost of existing silver-coated copper micro powder in photovoltaic application are difficult to consider at the same time. Through pH adjustment, organic pre-bonding treatment and gradient ammonification, the activity of the copper powder is reserved, and a uniform copper-ammonia complexing layer is constructed; in the chemical silver plating stage, the pretreatment liquid is added into a composite base solution containing a complexing agent, organic amine, a dispersing agent and a combined reducing agent, and a silver-ammonia solution is dropwise added for reaction under ultrasonic dispersion and nitrogen introduction protection; and in the post-treatment stage, a finished product is obtained through ethanol reflux desorption, antioxidant treatment, vacuum drying, low-temperature plasma activation and screening, uniform and complete coating of a silver layer can be achieved under the low silver content, and a feasible path is provided for replacing photovoltaic pure silver powder with silver-coated copper micro powder on a large scale.

The invention discloses a hard carbon sodium battery negative electrode material taking peanut shells as a raw material, which is micron-sized particles of mixed nano-particles containing C, O, Na and N. After the material is subjected to ultrasonic dispersion, holes are wrapped by graphitization-like areas with the size range of 0.6-3 nm to form disordered accumulation, and the average graphite layer spacing is 3.6-4.0. The preparation method comprises the following steps: heating and pre-oxidizing the peanut shells in an air atmosphere, grinding or crushing the peanut shells into powder, adding a disodium ethylene diamine tetraacetate solution, uniformly stirring, and drying; and calcining and carbonizing the dried mixture in a nitrogen atmosphere, and cooling to obtain the hard carbon sodium battery negative electrode material taking the peanut shells as the raw material. When the obtained hard carbon material serves as a sodium ion battery negative electrode and is charged and discharged at 0.1 C, the initial charging specific capacity can reach 274-318 mAh.g <-1 >, the first-circle coulombic efficiency reaches 74%-84%, and the problems that a hard carbon sodium battery negative electrode material is low in capacity and low in initial coulombic efficiency are solved.

The invention discloses a recycled modified polypropylene composite material preparation system and a resource recovery method, and relates to the technical field of high polymer material science and engineering. The raw material pretreatment module adopts near infrared spectrum classification, multi-stage cleaning, drying and crushing, and the moisture content is controlled to be less than 0.5%; the melt blending module melts the materials at 180-220 DEG C, modifiers and additives are added, and vacuum degassing is performed to remove impurities; adding a reinforcing agent into the modification reinforcing module, and performing ultrasonic dispersion and dynamic vulcanization; the molding processing module is used for manufacturing a product through extrusion, injection molding or calendaring; the quality detection module is used for detecting mechanical and thermal properties; the waste recovery module is used for crushing and melting granulation to realize a closed loop; the intelligent control module uses a PLC to coordinate each module. Integrated treatment of waste polypropylene is achieved, the purity of raw materials and the performance of a composite material are improved, the resource utilization rate is increased through closed-loop recycling, manual intervention is reduced through intelligent control, product stability is guaranteed, economic and environment-friendly benefits are achieved, and high-valued circulation of waste plastic is promoted.

The invention relates to a low-ice-adhesion super-hydrophobic anti-icing coating as well as a preparation method and application thereof. Single-end amino fluorosilicone oil is grafted to the surface of an aldehyde group functionalized metal organic framework material through an amino-aldehyde group condensation reaction to obtain a hydrophobically modified metal organic framework material, the hydrophobically modified metal organic framework material is compounded with a synthesized fluorinated acrylate copolymer, and the coating is prepared through ultrasonic dispersion and spraying curing processes. According to the prepared low-ice-adhesion super-hydrophobic anti-icing coating, through the synergistic effect of fluorosilane grafting modification and a micro-nano structure, the excellent performance that the static water contact angle is larger than or equal to 160 degrees, the rolling angle is smaller than or equal to 2 degrees, and the ice adhesion strength is smaller than or equal to 20 kPa is achieved. Compared with a traditional anti-icing coating, a metal organic framework material functional modification strategy is adopted, the ice adhesion force is remarkably reduced while the mechanical stability of the coating is kept, and uniform film forming on the surfaces of base materials such as aluminum wires can be achieved through the spraying technology. The coating is suitable for anti-icing protection of the aluminum conductor of the power transmission line, and has the characteristics of long-acting icing resistance and low ice adhesion.

The invention relates to anti-freezing concrete prepared from a nano material gamma-Al2O3 and a preparation method of the anti-freezing concrete, in particular to the anti-freezing concrete prepared from the nano material gamma-Al2O3 and the preparation method of the anti-freezing concrete. The invention aims to solve the problems of poor anti-freezing durability and high manufacturing cost of the existing anti-freezing concrete. The concrete disclosed by the invention is prepared from a cementing material (cement and a nano material gamma-Al2O3), coarse aggregate, fine aggregate, a high-efficiency water reducing agent, a flocculating agent and water. The preparation method comprises the following steps: adding the high-efficiency water reducing agent into water according to the raw material ratio, stirring, adding the nano material gamma-Al2O3, dispersing by using an ultrasonic dispersion instrument, adding into the mixed aggregate and cementing material, and uniformly stirring to prepare the concrete. The concrete disclosed by the invention has the characteristics of simple preparation process, small number of harmful holes, high strength, good frost resistance and the like. The preparation method is applied to the field of preparation of anti-freezing concrete.

The invention relates to the technical field of wave-absorbing materials, in particular to a broadband wave-absorbing material and a preparation method and application thereof. According to the preparation technology of the wave-absorbing material, a non-woven fabric carrier with graded pores and continuous gradient distribution is constructed by virtue of induction of a centrifugal force field, and then the non-woven fabric carrier is placed in a magnetic dispersion liquid system to be subjected to impregnation ultrasonic dispersion load treatment, so that heterogeneous interface structures are constructed on the surfaces and the interiors of fibers, and the prepared material fabric has the characteristics of light weight and broadband wave-absorbing performance; the method is suitable for military and civil high-tech fields such as electromagnetic protective clothing and invisibility. The method has the advantages of short production period, high raw material utilization rate and the like.

The invention discloses a nanocarbon-copper heterogeneous interface construction method for improving the electromagnetic shielding and heat-conducting properties of a graphene / magnesium composite material and a composite material based on the nanocarbon-copper heterogeneous interface construction method, and belongs to the technical field of heterogeneous interfaces. The method comprises the following steps: mixing intrinsic graphene, a surfactant and a foaming agent, performing ultrasonic dispersion treatment in solvent water, and performing freeze drying to obtain an intrinsic graphene preform; performing chemical vapor deposition on the intrinsic graphene preform serving as a substrate, and performing in-situ deposition of nanocarbon on the surface of the intrinsic graphene preform to obtain an intrinsic graphene-nanocarbon preform; a copper-containing oxidizing agent and a reducing agent are added into ethyl alcohol for ultrasonic treatment, an ethyl alcohol solution is obtained, the intrinsic graphene-nanocarbon prefabricated body is added into the ethyl alcohol solution, standing and drying treatment are conducted, then heat treatment is conducted, and an intrinsic graphene-multi-dimensional nanocarbon-nanocopper prefabricated body is obtained; and heating is conducted under argon protection, a magnesium alloy matrix is placed on the intrinsic graphene-multi-dimensional nano carbon-nano copper prefabricated body for liquid-solid infiltration extrusion, and the intrinsic graphene reinforced magnesium-based composite material is obtained. The method is used for solving the problems that existing intrinsic graphene of a three-dimensional network structure cannot have excellent electromagnetic shielding performance and heat-conducting performance at the same time, and existing magnesium-based composite materials only conduct single electromagnetic shielding performance or heat-conducting performance regulation and control.

The invention discloses a wear-resistant flux-cored wire and a manufacturing method thereof, and belongs to the technical field of welding materials, the wear-resistant flux-cored wire is formed by wrapping three layers of flux cores with a low-carbon steel strip, the inner main wear-resistant layer contains chromium carbide, recycled slag, cobalt-based alloy and carbon nanofibers, and the outer main wear-resistant layer contains chromium carbide, recycled slag, cobalt-based alloy and carbon nanofibers; the gradient mixing layer is in gradient transition of inner and outer layer components; and the outer auxiliary wear-resistant layer contains tungsten carbide, ferrovanadium and electrolytic manganese powder. The preparation method comprises the steps of waste residue recovery treatment, ultrasonic dispersion and mixing, layered vibration compaction and cold drawing forming. Through three-layer structure collaboration, nano reinforcement and solid waste recovery, the wear resistance is improved by 20%-30%, the cost is reduced by 15%-20%, and the composite material is suitable for complex working conditions such as mines and metallurgy and has the advantages of being high in bonding strength, resistant to cracks, stable in process and the like.

The invention discloses a method for preparing an hBN ceramic coating on the surface of a SiCp / 2024Al substrate, and belongs to the technical field of surface treatment. The invention discloses a method for preparing an hBN ceramic coating on the surface of a SiCp / 2024Al substrate. The method comprises the steps that the SiCp / 2024Al substrate is polished and ground and then dried after being subjected to ultrasonic cleaning; adding sodium silicate, sodium hydroxide, the hexagonal boron nitride nano-powder and a surface active component into deionized water, and performing ultrasonic dispersion to obtain a composite electrolyte; placing the composite electrolyte in a stainless steel electrolytic bath, and connecting the stainless steel electrolytic bath to a power supply cathode of a plasma discharge system; the pretreated SiCp / 2024Al substrate is connected to the positive electrode of a power source of a plasma discharge system and immersed in the composite electrolyte; and the plasma discharge system operates, under the action of positive and negative pulses, the nano-particles are driven to migrate to the surface of the SiCp / 2024Al substrate and participate in reaction co-deposition, and the compact and uniform large-thickness high-electrical-insulation hBN ceramic coating grows on the surface of the substrate.

The invention belongs to the field of electrochemical sensors, and relates to an electrochemical sensor for high-sensitivity detection of diuron and a preparation method of the electrochemical sensor. An HNT (halloysite nanotube)-CNC (carbon nanocage)-SWCNT (single-walled carbon nanotube) nanocomposite material prepared from a halloysite nanotube, a carbon nanocage (CNC) and an SWCNT (single-walled carbon nanotube) is modified on the surface of a GCE (glassy carbon electrode) to form an HNT-CNC-SWCNT / GCE working electrode. The method comprises the following steps: firstly, uniformly dispersing CNC and SWCNT which are equal in mass in an N, N-dimethylformamide solution through magnetic stirring in an ultrasonic environment; then, adding HNT into the solution, and carrying out ultrasonic dispersion to obtain a uniformly mixed HNT-coated CNC-coated SWCNT turbid liquid; and finally, dispensing the uniform turbid liquid on the surface of GCE, and drying under an infrared lamp to prepare the nano composite material modified HNT / CNC / SWCNT / GCE working electrode. Based on the synergistic interaction effect generated by HNT, CNC and SWCNT, the HNT / CNC / SWCNT / GCE sensor is high in sensitivity, the detection limit can reach 18.04 nM, and the diuron sensing detection performance is excellent.

The invention discloses thermal insulation and waterproof integrated phase change heat storage mortar and a preparation method thereof, and belongs to the technical field of building materials. The mortar is prepared from the following raw materials: cement, water, fine aggregate, shape-stabilized phase-change material super-hydrophobic silicon dioxide, a water reducing agent and polysorbate, the preparation method of the shape-stabilized phase change material-coated super-hydrophobic silicon dioxide comprises the following steps: S1, carrying out hydrophobic modification on diatomite to obtain hydrophobic modified diatomite; s2, adding n-hexadecane into the hydrophobic modified diatomite, and obtaining a shape-stabilized phase change material through a vacuum impregnation method; and S3, adding the shape-stabilized phase change material and the super-hydrophobic silicon dioxide into water, stirring, performing ultrasonic dispersion, and filtering and drying to obtain the shape-stabilized phase change material-coated super-hydrophobic silicon dioxide. The shape-stabilized phase-change material and super-hydrophobic silicon dioxide are doped into the mortar, so that the compressive strength, the thermal insulation performance and the waterproof performance of the mortar are remarkably improved, and the mortar has excellent durability.

The invention relates to the technical field of polyurethane materials, in particular to a non-MOCA type fitness equipment rubber coating material and a preparation method thereof. The preparation method comprises the following steps: adding polytetrahydrofuran, isophorone diisocyanate, 1, 4-butanediol, a 2, 2-dimethylolpropionic acid solution, a hydroxyl chain extender, triethylamine, deionized water and a flame-retardant filler to obtain a polyurethane emulsion; and coating the polyurethane emulsion to form a film, and drying to obtain the polyurethane adhesive film. Adding the flame-retardant filler into ethanol, and ultrasonically dispersing uniformly to obtain dispersion liquid; spraying the dispersion liquid onto the surface of a polyurethane adhesive film to obtain a pretreated polyurethane adhesive film; and carrying out layer-by-layer self-assembly on the surface of the pretreated polyurethane adhesive film for 5-6 times to obtain a finished product. The finished product prepared by the invention has excellent flame retardant property, antibacterial property and mechanical property, thereby having wide application prospect in the technical field of polyurethane materials.

The invention relates to the technical field of ultrahigh-voltage cable preparation, in particular to a modification method of conductive carbon black, an ultrahigh-voltage cable semi-conductive shielding material and a preparation method of the ultrahigh-voltage cable semi-conductive shielding material, and the modification method comprises the following steps: A, adding polyethyleneimine into a solvent, and performing ultrasonic dispersion and heating to obtain dispersion liquid; b, uniformly mixing conductive carbon black powder with the dispersion liquid in the step A, granulating and drying to obtain modified conductive carbon black; the ultrahigh-voltage cable semi-conductive shielding material has excellent electrical performance and mechanical performance, the processing process has the advantages of being simple in process, reliable in preparation, excellent in performance and the like, large-scale production is facilitated, and the ultrahigh-voltage cable semi-conductive shielding material has very high practical and popularization value in actual cable manufacturing.