4031 results about "Nanotube" patented technology

Improved performance ion exchange membranes for use in REM, AEM and DMFC fuel cells, buffered fuel cells, hydrolysis, other applications comprise a molecular matrix of homopolymers, di-monomer, heteropolymers, copolymers, or block-polymers of fluorocarbon and hydrocarbon compounds combined with (i) skeletal support grid to improve durability, handling, reduce membrane swelling, and sequester dopants and nanoparticles from leakage; (ii) microporous membrane formed using a sacrificial filler process enhancing conductivity and limiting fuel crossover; (iii) hetero-ionomeric matrix of two-or-more membrane-bound acids e.g. sulphonic and phosphonic acid expanding usable range; (iv) permanent fillers enhancing conductivity and porosity including nanoparticles, metal-oxides, zeolites, silicates, GOs, CNTs, MOFs, POSS, and others; (v) ionic liquid doping to enhance membrane conductivity; (vi) membrane nanocoating preventing H2O2 diffusion; and / or (vii) catalytic nanocoating with metals, metal-oxides, and MOFs preventing atmospheric toxin catalyst poisoning. Combined with a heterogenous GDI, the IEM is integrated into iBFC power blade and energy bank applications.

The invention discloses a cement-based aerogel heat preservation and heat insulation coating material for concrete and a spraying construction process of the cement-based aerogel heat preservation and heat insulation coating material, and belongs to the technical field of concrete materials. The coating material is prepared from powder, composite emulsion and water, and the powder is prepared by mixing superfine sand, cement, modified silicon dioxide-carbon nanotube composite aerogel powder, hollow glass beads, nanofibers, graphene nanosheets, an ultraviolet light absorber, a water reducing agent and a defoaming agent. The composite emulsion is composed of an acrylate copolymer emulsion, a polyvinyl acetate-ethylene emulsion, a temperature-sensitive polymer emulsion and a coalescing agent. Based on the multi-stage pore network and multi-component emulsion optimization design and multi-component synergistic effect, the material has good fluidity after being mixed, and has low heat conductivity coefficient, high strength and high toughness after being hardened; the construction technology of high-pressure water flushing and layered spraying is provided, and the method has the advantages of being efficient in construction, stable in quality and the like and can be applied to heat preservation and heat insulation of a concrete structure in a severe environment.

The invention relates to the technical field of polymeric membrane materials, and particularly discloses an antistatic polyethylene composite membrane and a preparation method thereof. Comprising the following raw materials in parts by weight: 100 parts of low-density polyethylene, 5-9 parts of high-density polyethylene, 10-20 parts of maleic anhydride grafted polyethylene, 8-15 parts of a polyvinyl alcohol modified material, 3-5 parts of antistatic modified carbon black, 0.5-1 part of an antioxidant and 1-2 parts of a dispersing agent, the polyethylene composite film has excellent dispersibility, can effectively enhance the mechanical properties of the polyethylene composite film through the synergistic effect of physical filling and chemical grafting, forms a layer of conductive network structure, namely a conductive film, on the surface of the material through the combined effect of the polyethylene composite film and the antistatic agent, prevents the generation and accumulation of static electricity, and has good compatibility among the raw materials. And the material has excellent mechanical property and antistatic property.

The invention relates to the technical field of cables, and provides a fireproof flame-retardant 10kV power cable and a preparation method thereof. The fire-resistant flame-retardant 10kV power cable comprises a conductor and a fire-resistant flame-retardant layer, the fireproof flame-retardant layer is prepared from the following raw materials in parts by weight: 35 to 45 parts of linear low-density polyethylene, 40 to 50 parts of ethylene-vinyl acetate copolymer, 25 to 30 parts of modified aluminum hydroxide, 5 to 8 parts of polyethylene grafted maleic anhydride, 10 to 12 parts of phosphate modified halloysite nanotube, 5 to 8 parts of ZIF-8 loaded zinc borate core-shell particles, 15 to 20 parts of magnesium hydroxide and 2 to 3 parts of silane coupling agent. 0.5 to 1 part of antioxidant, 0.5 to 1 part of calcium stearate and 1 to 1.5 parts of polyethylene wax. According to the cable prepared in the invention, the situation that a conductor is exposed and the fire resistance is lost due to cracking and falling under long-time high-temperature baking is avoided; the continuous effectiveness of the flame retardant at high temperature is improved.

The invention provides a carbon nanotube / polyvinyl alcohol hydrogel and a preparation method and application thereof, and belongs to the technical field of composite materials and flexible electron cross materials. Cellulose nanofibers and multi-walled carbon nanotubes are dispersed in deionized water to obtain dispersion liquid; uniformly mixing a polyvinyl alcohol solution and the dispersion liquid to obtain a mixed solution; carrying out oriented freezing forming on the mixed solution, and then freeze-drying the mixed solution to obtain an aerogel sample; performing hot pressing on the aerogel sample to obtain a thin film material; and swelling and balancing the film material in deionized water to obtain the carbon nanotube / polyvinyl alcohol hydrogel. According to the invention, collaborative optimization of conductive network continuity, interface bonding strength and energy dissipation capability is realized, so that high conductivity, high stress and obdurability are considered, and the material is endowed with multi-dimensional strain sensing capability and signal stability; and a new idea is provided for realizing effective balance between high conductivity and excellent mechanical properties of the hydrogel material.

The invention discloses a polypyrrole / cobalt / nitrogen-doped carbon composite material with a coaxial hollow structure and a preparation method thereof, and belongs to the technical field of advanced functional composite materials. The method comprises the following steps: firstly, synthesizing a hollow polypyrrole nanotube by a soft template method; secondly, cobalt / nitrogen-doped carbon is synthesized by adopting a template guiding method; and finally, secondarily coating the outer surface of the cobalt / nitrogen-doped carbon with a polypyrrole layer by adopting an in-situ oxidative polymerization method to construct the polypyrrole / cobalt / nitrogen-doped carbon composite material with a coaxial hollow heterostructure, and the polypyrrole / cobalt / nitrogen-doped carbon composite material has a coaxial sandwich structure: the inner core is a nitrogen-doped carbon hollow tube, the middle layer is a nitrogen-doped porous carbon matrix embedded with cobalt nanoparticles, and the outer surface of the cobalt / nitrogen-doped carbon composite material is a porous carbon matrix embedded with cobalt nanoparticles. And the outer layer is a conductive polypyrrole coating layer. The preparation method provided by the invention can successfully realize in-situ confinement growth and stable combination of ZIF-67, and has the advantages of high repetition rate, high yield and simple method; by adjusting the proportion of polypyrrole in the composite material, good impedance matching and large dielectric loss can be realized, and excellent electromagnetic wave absorption performance can be obtained.

The invention relates to a method for preparing a carbon nanotube reinforced copper-silver-based electrical contact composite material based on a liquid phase atomization method, and belongs to the technical field of electrical contact preparation. The preparation method comprises the following steps: carrying out hot pressed sintering on mixed powder of reinforcement powder, copper powder and silver powder, solidifying the powder to form an Ag-coated CNTs / Cu-Ag composite material block, and then preparing the Ag-coated CNTs reinforced Cu-Ag-based electrical contact composite material through a process route of solid solution, extrusion and aging. The preparation method disclosed by the invention is simple to operate and stable in preparation process, and the mechanical and electrical properties of the prepared composite material can respectively reach 157HV and 103% IACS (International Annealed Copper Standard) and above; according to the method, ablation and damage of the surface of the electrical contact in the working process are relieved, the viscosity of a molten pool is increased, the contact resistance in the electrical contact process can be reduced, the current concentration phenomenon and the temperature rise effect at a contact point can be relieved, the mass loss of an electrical contact material is reduced, the maintenance cost is reduced, and the method has good application prospects in the field of electrical contact materials.

The invention provides conductive paste, a solar cell, a preparation method of the solar cell and a photovoltaic module. The conductive paste comprises the following components in parts by weight: 70-85 parts of silver powder, 3-8 parts of glass powder, 0.1-2 parts of an additive and 12-25 parts of an organic carrier, wherein the silver powder comprises spherical silver powder and flaky silver powder; the glass powder is prepared from the following components in parts by weight: 65 to 75 parts of Bi2O3, 18 to 25 parts of TeO2 and 8 to 12 parts of V2O5; the additive is a carbon material and / or conductive metal oxide nanoparticles; the organic carrier comprises an infrared absorbing material; the infrared absorption material is selected from any one or more of copper phthalocyanine, a polyaniline-carbon nanotube compound and a tungsten oxide nanowire. The conductive paste can improve the conductivity of the conductive paste and improve the efficiency of the conductive paste in a laser sintering process, so that the contact resistivity is reduced, and the photoelectric conversion efficiency of a photovoltaic solar cell is improved.

The invention belongs to the technical field of protective coatings, and discloses an anti-corrosion, wear-resistant and high-temperature-resistant coating as well as a preparation method and application thereof. The coating comprises a primer, a middle transition layer and a finish; the raw materials of the primer comprise a primer material and a primer curing agent component; the primer material comprises modified epoxy phenolic resin, a primer functional filler, a first mixed solvent, a high-temperature-resistant coupling agent and an anti-settling agent; the raw materials of the middle transition layer comprise a middle transition layer material and a middle curing agent component; the materials of the middle transition layer comprise polyimide modified epoxy resin, a wear-resistant filler, a reactive diluent, a carbon nanotube, a first dispersant and a compatilizer; the raw materials of the finishing paint comprise a finishing paint material and a finishing paint curing agent component; the finishing paint material comprises organic silicon modified fluorocarbon resin, finishing paint functional filler, a second mixed solvent, a second dispersing agent and a flatting agent. According to the invention, a resin-based composite coating system is synergistically designed through multi-phase materials, so that optimal balance of corrosion resistance, wear resistance, toughness and high temperature resistance of the coating is realized.

The invention belongs to the field of flow energy storage battery materials, and particularly relates to a multi-dimensional conductive material, a preparation method thereof and application of the multi-dimensional conductive material in an all-vanadium flow battery. Graphite and multi-walled carbon nanotubes are bonded together by adopting a biomass precursor, a carbon base of biomass is converted into graphitized carbon nanotubes through step-by-step pyrolysis, amorphous carbon in the graphite and the original carbon nanotubes is further graphitized, and finally the multi-dimensional conductive material with the carbon nanotubes inserted on a graphite matrix is formed. The multidimensional characteristic of the surface of the multidimensional conductive material is beneficial to formation of a longitudinal conductive path of the bipolar plate and reduction of vertical body resistance of the bipolar plate, and is also beneficial to wetting of epoxy resin among conductive particles and mechanical interlocking of molecular chains of the epoxy resin, so that the mechanical strength of the bipolar plate is improved, the use performance of the bipolar plate is effectively enhanced, and the service life of the bipolar plate is prolonged. The requirement of long-time operation of the flow battery is met, the material cost of the flow battery is relatively reduced, the industrialization of the bipolar plate is powerfully promoted, and the application value is very good.

The application relates to the technical field of material preparation, and discloses multi-element carbon-coated lithium manganate, a preparation method thereof and a secondary battery. The multi-element carbon-coated lithium manganate comprises a lithium manganate core and a carbon nanotube layer and a hard carbon layer which are sequentially coated on the lithium manganate core. The chemical formula of the lithium manganate core is LiAl a X b Mn 2‑a‑b O4, wherein 0.01<=a<=0.10, 0.01<=b<=0.05, and X comprises at least one of Co, Cr, Ti, V and B. The preparation method of the multi-element carbon-coated lithium manganate comprises the following steps: (I) preparing doped lithium manganate, (II) preparing carbon nanotubes and (III) multi-element carbon coating. The multi-element carbon-coated lithium manganate has high conductivity, rate performance, cycle performance and safety performance, and can be used as an alternative positive electrode material with high cycle and excellent fast-charging performance.

The invention relates to the technical field of corrosion resistance, in particular to a corrosion-resistant and wear-resistant copper insert and a preparation method thereof.The copper insert is subjected to plating treatment in an ionic liquid electroplating mode, then the surface of a plating layer is subjected to hole sealing treatment, and a nickel-copper-composite halloysite nanotube layer is electrically deposited on the surface of the formed copper insert; the preparation method comprises the following steps: taking a halloysite nanotube as a nano loader of a corrosion inhibitor, and coating with dopamine to obtain a composite halloysite nanotube; in the hole sealing liquid, the composite halloysite nanotube is used as a filler, silane modified polyurethane is used as a base material, the silane modified polyurethane is a prepolymer synthesized by using isophorone diisocyanate and polytetramethylene ether glycol as raw materials, octylamine ring-opened 3-(2, 3-epoxypropoxy) propyltrimethoxysilane is used as a chain extender, and the silane modified polyurethane is used as the base material. And 2-(perfluorodecyl) ethanol and aminopropyltriethoxysilane are used as end-capping reagents, so as to prepare the high-temperature-resistant coating.

A high-density tactile sensing array based on a bionic microstructure comprises a flexible substrate for providing mechanical flexibility and packaging protection; the bionic microstructure layer is composed of a pyramid array or a hemisphere array and is used for enhancing sensitivity and spatial resolution; the carbon nanotube (CNT) sensitive layer uniformly covers the surface of the microstructure and converts pressure change into an electric signal; according to the thin film transistor signal reading system, active matrix design is adopted, pixel-level signal extraction is achieved through a row-column addressing strategy, and electric signals are rapidly and accurately processed. According to the preparation method, photoetching, wet etching and hot reflux processes are combined, precision machining of a microstructure is achieved, and a uniform CNT sensitive layer is formed through a spraying technology. According to the design method, microstructure parameters and sensitive layer characteristics are optimized through equivalent circuit model construction and simulation verification, and collaborative optimization of high sensitivity and wide dynamic range is achieved. The invention has the advantages of high sensitivity, high spatial resolution, low crosstalk, quick response and the like.

The present invention relates to a preparation method of a flame-retardant, high-refractive-index, melt-drop resistant waterborne polyurethane coating. A diol, an isocyanate and dibutyltin dilaurate are added to a 500 mL flask, and the temperature is raised to 70-85 °C, and the mixture is stirred and reacted for 1-2 h to obtain a polyurethane prepolymer; then a charring agent is added to the polyurethane prepolymer, and the reaction is continued for 1-2 h; the temperature is lowered to 60 °C, and then 2,2-dimethylolbutyric acid and amino carbon nanotubes are added and reacted for 0.5-1 h; then a high-refractive-index material is added, and the reaction is carried out at 65-70 °C for 1-2 h, the temperature is lowered to 40 °C, and then triethylamine is added and reacted for 0.5-1 h; deionized water is added, and at a rotation speed of 2000 r / min, an ammonium polyphosphate solution is added, and high-speed shear emulsification is carried out for 0.5-1 h to obtain a flame-retardant, high-refractive-index, melt-drop resistant waterborne polyurethane coating. This polyurethane coating has high flame retardancy, high refractive index and no melt-dropping property.

The invention provides a method for preparing a carbon nanotube with assistance of carbon dioxide, which is characterized in that methane is used as a carbon source, carbon dioxide is used as auxiliary gas, and the carbon nanotube is prepared under the action of a catalyst. Carbon deposition generated by using methane as carbon source gas is reduced by using carbon dioxide, and the quality and performance of single-wall, double-wall or three-wall carbon nanotubes are improved, so that application requirements are met.

Disclosed is a collaborative design system and method for a thermophysical property gradient distribution and a braided structure of a CMC and a storage medium. The system comprises at least one storage medium and at least one processor. The at least one processor is configured to: generate a temperature field parameter of a surface of a CMC turbine blade under a non-uniform inflow condition based on a simulation analysis platform, and extract a convective heat transfer coefficient; partition the CMC turbine blade and import an extracted fluid-solid heat transfer boundary condition into an optimization platform; perform multi-objective optimization on the thermophysical property gradient distribution of the CMC turbine blade under the non-uniform inflow condition based on an optimization simulation tool; and generate C nanotube contents of different regions of the CMC turbine blade based on a correspondence function and values of material thermal conductivities of the different regions of the CMC turbine blade to realize the collaborative design of the thermophysical property gradient distribution and the braided structure of the CMC.

The invention discloses a silicon-carbon negative electrode material, a preparation method thereof and a lithium ion battery, and relates to the technical field of lithium ion battery negative electrode materials. The material sequentially comprises a porous silicon core, a transition layer and a shell from inside to outside, the transition layer is a nitrogen-doped SiC / C composite layer, the shell comprises a graphene / carbon nanotube skeleton and MXene quantum dots, the MXene quantum dots are embedded in the graphene / carbon nanotube skeleton, boric acid ester bonds exist between carbon nanotubes and graphene, and the MXene quantum dots are embedded in the graphene / carbon nanotube skeleton. The silicon-carbon negative electrode material is based on dual-network dynamic bonding and stress gradient regulation and control, the cycle performance of the material can be remarkably improved, and the service life of the material can be remarkably prolonged.

The invention discloses a component gradient iridium tantalum coating anode and a preparation method thereof, the component gradient iridium tantalum coating anode comprises a titanium-based bottom layer, a middle layer and a surface active layer structure with component gradient, and the middle layer and the active layer are both prepared through a thermal decomposition method. And the intermediate layer is prepared on the titanium substrate and is composed of TiO2 / Ta2O5 mixed oxide. The surface active layer is prepared on the outer side of the middle layer and comprises a plurality of layers of IrO2 / Ta2O5 oxide coatings with different iridium-tantalum proportions. Compared with a traditional uniform coating anode, the prepared component gradient iridium tantalum coating anode can relieve the stress concentration phenomenon and reduce coating cracking, the service life of the anode is remarkably prolonged, and the catalytic activity of the anode is remarkably improved; the modified carbon nano tube is added into the active layer precursor solution, so that the conductivity change caused by component gradient is improved, and the cell voltage of the component gradient iridium tantalum coating anode is effectively reduced; and moreover, the iridium content is lower, and the preparation cost of the electrode is reduced.

The invention provides a lithium supplement agent. The lithium supplement agent comprises lithium oxalate particles, conductive carbon particles and additive particles, the conductive carbon particles comprise at least one of carbon black, carbon nanotubes, graphene and ketjen black; the additive particles comprise at least one of MnO2, NiO, Co3O4, TiO2, Fe3O4, MnC, TiC, Mo2C and MoO3, and the additive particles comprise at least one of MnO2, NiO, Co3O4, TiO2, Fe3O4, MnC, TiC, Mo2C and MoO3. According to the lithium supplementing agent disclosed by the invention, by limiting the structure and components of the lithium oxalate lithium supplementing agent, the carbon material is respectively coated in the lithium oxalate and the additive to form a good conductive network, and finally a composite material of the lithium oxalate, the carbon material and the additive is formed, so that the decomposition voltage can be sufficiently reduced; the lithium supplement effect of the lithium oxalate can be exerted to the maximum extent.

The invention discloses multi-scale toughened concrete and a preparation method thereof, and belongs to the technical field of high leakage, and the multi-scale toughened concrete comprises aluminoferrite cement, a low-shrinkage auxiliary cementing material, a water reducing agent, multi-scale composite fibers, a shrinkage compensation agent, fine aggregate, coarse aggregate and water. A traditional toughening mode is broken through, a physical-chemical composite connection interface is established through a magnetron sputtering metal gradient coating of crude fibers and a laser-induced dendritic crystal structure, a strain hysteresis effect is triggered under an impact load, impact energy is converted into interface phase change energy, and a high-efficiency energy dissipation channel is formed; an amino functional group and free radical cross-linked network is introduced into the fine fibers, and the fibers are endowed with microcosmic dynamic enhancement capability in combination with directional arrangement of the carbon nanotubes, so that the concrete forms cooperative interaction between macroscopic crack bridging and microcosmic crack inhibition, the crack resistance under complex stress is remarkably improved, and microcrack propagation is effectively inhibited.

The invention belongs to the technical field of lithium ion battery positive electrode materials, and provides a double-layer coated lithium iron manganese phosphate positive electrode material, which comprises a lithium iron manganese phosphate positive electrode material, and an organic carbon source coating layer and a modified carbon nanotube coating layer which coat the surface of the lithium iron manganese phosphate positive electrode material from inside to outside. Firstly, an organic carbon source is adopted to perform primary carbon coating on lithium manganese iron phosphate to form a carbon core-shell composite structure, and then modified carbon nanotubes are utilized to perform secondary coating to obtain the double-layer coated lithium manganese iron phosphate positive electrode material, so that organic-inorganic dual coating is realized, the electronic conductivity of the material can be effectively improved, and the performance of the material is improved. And the condition that the lithium manganese iron phosphate is directly contacted with the electrolyte to reduce the dissolution of Mn can be avoided, so that the cycle performance of the positive electrode material is improved, and the preparation process is simple in process, easy to operate and suitable for large-scale production.

The invention relates to the technical field of conductive materials, in particular to a high-concentration dispersion system and a preparation method thereof. The high-concentration dispersion system comprises a conductive agent, a dispersing agent, a solvent and a viscosity reduction auxiliary agent, the conductive agent is modified carbon nanotubes, the dispersing agent is modified polyvinylpyrrolidone, the solvent is N-methyl pyrrolidone or deionized water, and the viscosity reduction auxiliary agent is piperazine anhydrous; wherein the modified carbon nano tube is obtained by mixing and heating a carbon nano tube and a mixed acid solution of nitric acid and sulfuric acid, then cooling, filtering, washing, drying, then dispersing in 75% ethanol, and finally adding 3-[3-carboxyl allylamido] propyltriethoxysilane for modification; the modified polyvinylpyrrolidone is obtained by heating polyvinylpyrrolidone at 310-330 DEG C and then oxidizing the polyvinylpyrrolidone. The conductive agent content of the high-concentration dispersion system is high, the conductive agent accounts for 15%-20% of the high-concentration dispersion system by mass, and the high-concentration dispersion system is low in viscosity, high in dispersity and good in conductivity.

The invention relates to the technical field of high polymer materials, in particular to a resin composite material with flame-retardant and insulating properties and a preparation method thereof. The problems that in the prior art, a resin composite material is poor in flame retardance and insufficient in insulating property are solved. The preparation method comprises the following steps: modifying epoxy resin with maleic anhydride and carboxyl modified nitrile rubber to obtain modified epoxy resin; a modified flame-retardant system is obtained by processing the carbon nanotube loaded melamine polyphosphate, the triphenyl phosphate and the magnesium hydroxide; the preparation method comprises the following steps: mixing modified epoxy resin and a modified flame-retardant system, adding modified nano silicon dioxide through a supercritical fluid technology and ultrasonic dispersion, and performing staged curing through a curing agent to obtain a resin composite material; the flame retardant property of the composite material is improved through the synergistic effect of the flame retardant and loading of the carbon nanotubes; and through the synergistic effect of the modified nano silicon dioxide and the carbon nanotubes, the insulating property of the composite material is improved.

The utility model belongs to the technical field of preparation of carbon nanotubes, and particularly relates to a carbon nanotube discharging device. The discharging device is arranged at the discharging end of the tubular heating furnace and comprises a collecting bin, and a collecting cavity communicating with a discharging opening of the tubular heating furnace is formed in the collecting bin. An operation opening is formed in the collecting bin, a flexible pipeline is connected to the operation opening, and the operation opening is connected with the near end of the flexible pipeline in a sealed mode; at least one operating rod penetrates through the flexible pipeline and extends into the collecting cavity, and the far end of the flexible pipeline is in sealed connection with the operating rod; a discharging connector is arranged at the bottom of the collecting bin. The collecting bin arranged at the discharging end is beneficial to timely removal of flocculent single-walled carbon nanotubes formed in the growth process, furnace tube blockage is prevented, production continuity is guaranteed, and safety is improved. And a flexible pipeline and an operating rod are arranged on the collecting bin, so that an operator can collect the carbon nanotubes under the condition that the normal operation of the heating furnace is not influenced. The winding roller is beneficial to orderly collection of carbon nanotube floccules.

The invention relates to the field of nano materials, in particular to an Mxene nano hybrid material and application thereof in a flame-retardant foaming material, and the preparation method of the Mxene nano hybrid material comprises the following steps: step 1, obtaining an aminated MXene nanosheet; step 2, obtaining a sulfhydrylated halloysite nanotube; step 3, obtaining a modified MXene nanosheet; and step 4, obtaining the MXene nano hybrid material. The MXene nano hybrid material prepared by the invention not only has good compatibility with polyurethane foam, but also provides a large number of nucleation sites for a polyurethane foaming system to play a role of a foam stabilizer, so that the finally prepared polyurethane foam material has multiple advantages of high strength, high flame retardance, high thermal conductivity and the like.

The invention relates to the technical field of high polymer material processing, and particularly discloses a polyethylene rotational plastic-gradient density-based lightweight hollow product and a method thereof.The polyethylene rotational plastic-gradient density-based lightweight hollow product is prepared from high-density polyethylene, linear low-density polyethylene, nano-silica, carbon nanotubes, a flexibilizer, PE wax and an antioxidant through blending, granulation and grinding; placing the powder in a mold, heating, melting and spinning to form an outer high-density enhancement layer; the preparation method comprises the following steps: blending low-density polyethylene, high-density polyethylene, a microcapsule foaming agent, a compatibilizer and an antioxidant, granulating and grinding; the powder is placed in a mold to continue to be heated and rotated till fusion is completed; cooling to trigger the microcapsule foaming agent to decompose, and reducing the rotating speed until an inner low-density foaming layer is formed on the inner wall of the outer high-density enhancement layer; and performing water-cooling on the outer-layer step, and performing air-cooling on the inner-layer step to obtain a light-weight hollow finished product. The multifunctional requirements for light weight, high strength and heat insulation can be met at the same time, and densification, foaming and gradient curing are completed in a single period.

The invention belongs to the field of conductive paste preparation, and particularly discloses conductive paste containing ruthenium oxide and a preparation method of the conductive paste. The conductive paste is prepared from the following components in percentage by mass: 40 percent to 50 percent of ruthenium oxide, 3.8 percent to 5 percent of carbon nano tubes, 5 percent to 10 percent of PbO-B2O3-SiO2, 3 percent to 8 percent of ethyl cellulose, 21 percent to 28 percent of terpilenol, 9 percent to 12 percent of butyl carbitol, 0.7 percent to 1 percent of ammonium polyacrylate and 1 percent to 2 percent of dibutyl phthalate. According to the preparation method, ruthenium oxide is activated in vacuum, a mixed solvent is combined after dispersion, and a ball milling and ultrasonic dispersion synergistic process is adopted, so that the slurry is uniformly dispersed and has excellent stability. According to the invention, a ruthenium oxide-carbon nanotube-frit ternary synergistic system is constructed, and terpilenol and butyl carbitol in a specific mass ratio are taken as a mixed solvent, so that the problems of insufficient conductivity and easy agglomeration of traditional paste are effectively solved, and the method can be widely applied to manufacturing of high-precision electronic devices.

The invention discloses an anode material for adipic acid monoester electrolysis and a preparation method of the anode material, the electrode solves the key problems that a platinum layer is easy to fall off, the catalytic activity is low, the organic matter poisoning resistance is poor and the like of a traditional titanium platinum-plated electrode through multi-scale interface strengthening and nano structure regulation and control; the preparation method comprises the following core steps: constructing a porous ZrO2-TiO2 composite oxide layer on the surface of a titanium substrate by adopting a micro-arc oxidation-hydrothermal composite process, and generating platinum nanoparticles in situ to pre-fill pores, so that the anchoring effect of a platinum layer is remarkably enhanced; depositing a platinum / carbon nano tube (Pt / CNT) composite catalyst layer on the surface of the oxide layer through a pulse-ultrasonic synergistic electroplating technology, wherein the carbon nano tube is used as a conductive framework to inhibit platinum agglomeration; through vacuum annealing and electrochemical activation treatment, the interface bonding force and active site exposure are further optimized; the electrode shows excellent performance in an adipic acid monoester electrolysis system, and efficient electrocatalytic conversion from adipic acid monomethyl ester to dimethyl sebacate is achieved.

The invention provides a sidewalk antiskid terrace material and a construction process thereof, and belongs to the technical field of terrace material manufacturing. The sidewalk antiskid terrace material is prepared from the following components: epoxy resin, polysiloxane elastic resin, fluorocarbon resin, modified covalent organic framework nanosheets, boron nitride nanotubes, nano silicon nitride particles, nano silicon dioxide, nano zinc oxide, a modified flame retardant, attapulgite, a curing agent, an accelerant, a flatting agent, a coupling agent and a dispersing agent. According to the sidewalk antiskid terrace material, various high-performance resins are compounded with the nano filler to form a coating with a compact and uniform structure, so that the mechanical strength and wear resistance of the terrace are remarkably improved. In addition, due to the application of the modified flame retardant, the floor has a good flame-retardant effect, and the safety is improved. The whole formula and the construction process are scientific and reasonable, strong adhesion of the coating is ensured, construction is simple and convenient, curing is sufficient, and the coating is suitable for long-term use of outdoor sidewalks and has attractive appearance and practicability.

The invention relates to the technical field of lithium batteries, in particular to a carbon nanotube modified lithium manganese iron phosphate material, application and a preparation method. The method comprises the following steps: mixing a solution containing lithium, phosphorus, iron and manganese with carbon nanotubes, heating to obtain lithium manganese iron phosphate powder, and sintering to generate the carbon nanotube modified lithium manganese iron phosphate material in situ. According to the method, the lithium manganese iron phosphate positive electrode material is generated in situ by utilizing the excellent conductivity of the carbon nanotubes, and the carbon nanotubes can form a uniform conductive network, so that the internal resistance of the material is remarkably reduced, and the charge-discharge efficiency of the material is improved; the method is simple in preparation process, uniform in obtained material structure, low in production energy consumption and raw material cost and suitable for large-scale industrial production.