619 results about "Nano al2o3" patented technology

The invention discloses water-based wear-resistant ink and a preparation method thereof, and belongs to the technical field of ink. The ink is prepared from the following components in parts by weight: 20 to 35 parts of waterborne polyurethane resin, 15 to 25 parts of waterborne acrylic resin with an acid value of 40 to 80 mg KOH / g, 5 to 15 parts of KH570 silane coupling agent modified nano aluminum oxide, 3 to 8 parts of polyethylene wax emulsion, 10 to 20 parts of pigment and auxiliaries. The preparation method comprises the following steps: firstly, carrying out surface modification on the nano aluminum oxide by using KH570, and then mixing, dispersing and grinding all the components. Through the synergistic effect of the acrylic resin with a specific acid value and the modified nano aluminum oxide, the problem that nano particles are easy to agglomerate in a system is solved, the nano particles can be stably dispersed, and the interface bonding with the resin is enhanced, so that the ink is endowed with excellent adhesive force, wear resistance and storage stability while the process is simplified and the cost is reduced; the BOPP film packaging material is especially suitable for BOPP film packaging materials.

The invention discloses a high heat storage density stable thermochemical adsorption composite heat storage material and a preparation method thereof, the high heat storage density stable thermochemical adsorption composite heat storage material comprises 54%-57% by mass of mixed salt and 43%-46% by mass of a porous material, the mixed salt comprises MgSO4 and MgCl2, the mass ratio of MgSO4 to MgCl2 is 9: 1-6: 4, and the porous material is expanded perlite modified by nano alumina or a silane coupling agent. The high-heat-storage-density stable thermochemical-adsorption composite heat storage material provided by the invention is simple in preparation method, and the modified expanded perlite is used as a carrier of the mixed hydrated salt; the obtained composite heat storage material has excellent performance: the salt-containing load rate is 114-121%, the water absorption rate is 1.2-1.28 g / g, the heat storage density is 1123.5-1208.6 kJ / kg, the heat storage temperature is 133.4-141.3 DEG C, the structural strength is 10.346-12.631 kPa, the structural stability is 99.27-99.53%, and the stability is 79.7-83.3% after circulation for 30 times, that is, the composite heat storage material is high in heat storage density, high in water absorption rate, low in heat storage temperature, high in strength and not easy to scatter and fall off, and the composite heat storage material is suitable for large-scale production. And the material also has relatively good cycling stability.

The invention discloses a cellulose coated diaphragm and a preparation method thereof in the field of lithium ion batteries, the diaphragm comprises alpha-cellulose pulp, a cellulose grafted phenylboronic acid-co-oligomeric ethylene oxide copolymer, a thermal response star zwitterionic polymer and nano aluminum oxide, and an N-methylmorpholine-N-oxide aqueous solution is adopted as a solvent system. The preparation method comprises the following steps: firstly synthesizing a cellulose grafted copolymer with dynamic borate bonds through atom transfer radical polymerization, then preparing a star polymer with thermal response arms and zwitter-ion terminals by taking cyclodextrin as a core, and finally mixing all the components to prepare coating slurry. And the composite diaphragm is prepared through the processes of coating, phase conversion, ultraviolet curing and drying. The diaphragm combines the thermal stability and lyophilic property of cellulose, forms a dynamic self-adaptive interface layer through the synergistic effect of two functional compounds, has the advantages of active safety protection, dendritic crystal inhibition, long cycle life and the like, and remarkably improves the comprehensive performance of the lithium ion battery.

The invention relates to the technical field of surface engineering, discloses a method and a system for preparing a yttrium fluoride composite ceramic coating through atmospheric plasma spraying, and aims to solve the problems that the yttrium fluoride coating generates a brittle aluminum fluoride layer on the surface of an aluminum substrate due to fluorine ion diffusion, so that the bonding strength is low, and the yttrium fluoride coating is easy to peel off and lose efficacy. The method comprises the following steps: sequentially carrying out mechanical polishing, ultrasonic cleaning and sand blasting roughening on an aluminum base material; preparing composite powder formed by mixing yttrium fluoride, yttrium oxide and nanometer aluminum oxide according to the mass ratio of 75: 20: 5; sequentially depositing a yttrium oxide transition layer, a composite barrier layer and a yttrium fluoride functional layer by adopting atmospheric plasma spraying; and finally carrying out vacuum post-heat treatment. According to the system, through the synergistic effect of the three layers of gradient structures, the transition layer forms an yttrium aluminate metallurgical bonding interface, the barrier layer inhibits fluorine ion diffusion through the dual mechanisms of nanometer aluminum oxide physical barrier and yttrium oxide chemical adsorption, and the functional layer guarantees the plasma erosion resistance. According to the method, the bonding strength of the coating is remarkably improved to 50 MPa or above, the porosity is lower than 3%, stripping is avoided under 500-hour high-energy plasma bombardment, the process cost is reduced by 40%, and the method is suitable for cavity protection of semiconductor etching equipment.

The invention belongs to the technical field of adhesives, and particularly discloses a single-component silicone sealant for stainless steel bonding and a preparation method thereof, and the single-component silicone sealant comprises the following components by weight: 50-60 parts of alpha, omega-dihydroxy polydimethylsiloxane; 10 to 15 parts of a polydopamine coated silicon carbide nanowire; 5 to 15 parts of modified nano aluminum oxide gel; 5 to 10 parts of methyltris (methylethylketoxime) silane; 1 to 3 parts of dodecyl tris (methylethylketoxime) silane; 0.03 to 0.3 part of a coordination enhanced organic tin catalyst; and 8-14 parts of a plasticizer. According to the single-component silicone sealant for stainless steel bonding and the preparation method of the single-component silicone sealant, the modified nanometer aluminum oxide gel is selected, the bonding performance of stainless steel in a humid and hot environment is promoted and improved, the silicon carbide nanowire is coated with polydopamine, the bonding performance of the stainless steel is effectively improved, and the single-component silicone sealant can be widely applied to various indoor and outdoor scenes.

The invention belongs to the technical field of thermal power heating surface treatment, and provides a multi-layer composite self-repairing anti-oxidation coating for a boiler heating surface and a preparation method of the multi-layer composite self-repairing anti-oxidation coating aiming at the technical problems that a thermal power boiler heating surface protective coating is insufficient in bonding strength, insufficient in long-term anti-oxidation capacity and concentrated in interface stress among multi-layer structures. Comprising a bonding layer, a gradient transition layer, a self-repairing functional layer and a ceramic surface layer which are sequentially arranged from inside to outside. The self-repairing functional layer is made of NiCoCrAlY alloy, the bonding layer is made of NiCrAlY alloy, the gradient transition layer comprises four layers of gradient transition layer units, each layer of gradient transition layer unit comprises a gradient composite structure of NiCrAlY and nano Al2O3, the self-repairing functional layer comprises NiCoCrAlY serving as a base body, thermal response type microcapsules are embedded in the NiCoCrAlY base body, and the ceramic surface layer comprises a nano ceramic material composed of Cr, Co, Ni, Fe, Al, Ti and B elements.

The invention relates to the technical field of refractory materials, in particular to an antioxidant and application thereof in steel ladle slag line bricks, and the antioxidant comprises a Si / SiC multiphase material, modified nano Al2O3 and CaF2; the ladle slag line brick comprises an antioxidant, fused magnesite, crystalline flake graphite and phenolic resin. Si-SiC compound waste is subjected to magnetic separation and acid pickling, then a SiO2 passivation layer is formed through pre-oxidation, moisture and air in the storage period are isolated, and a titanate coupling agent is introduced to improve the wettability and compatibility with phenolic resin. P2O5 released by phosphate on the surface of the modified nano Al2O3 at a high temperature reacts with alkali (earth) metal migrated to a SiO2 oxide layer to prevent the alkali (earth) metal from forming a low-melting-point eutectic substance, CaF2 reacts with SiO2 along with temperature rise, a passivation layer is broken, internal Si and SiC are directly exposed, and boron oxide of the modified nano Al2O3 remarkably reduces activation energy and a temperature threshold value of the reaction of CaF2 and SiO2.

The invention discloses a fracturing proppant using coal gangue and fly ash and a preparation process thereof, and relates to the field of fracturing proppants, the fracturing proppant comprises coal gangue, fly ash, silica fume, nanometer alumina, a composite pore-forming agent and a fluxing agent, and the preparation process comprises raw material pretreatment, mixing granulation, microwave-gradient sintering and post-treatment. The raw material pretreatment comprises the following steps: removing iron and impurities through carbon thermal reduction-magnetic separation; the composite pore-forming agent is enriched on the surface of the green body during mixed granulation; the microwave-gradient sintering is used for cooperatively regulating and controlling growth of mullite crystals through microwave preheating and resistance heating to form an internal acicular mullite interlaced structure and a surface micro-convex structure; a finished product is obtained through post-treatment grading and surface cleaning. Resource utilization of industrial solid waste is achieved, the strength and flow conductivity of the proppant are improved through raw material synergy, crystal structure regulation and control and surface microstructure design, preparation energy consumption is reduced, and the proppant is suitable for oil and gas field fracturing engineering.

The application provides a coated layered oxide sodium ion battery positive electrode material with excellent cycle stability, the positive electrode material is coated with nano-aluminum oxide and nano-titanium oxide on the surface of Na 0.66 Ni 0.23 Cu 0.1 Mn 0.67 O2 material. The positive electrode material provided by the application exhibits excellent long cycle stability and has a wide commercial development prospect.

The invention discloses a UV varnish applied to a PVC edge band and a preparation process thereof, and relates to the technical field of paints.The UV varnish comprises, by mass, 15-35% of hydroxyl polyester acrylate, 5-10% of a curing agent, 1-5% of a curing agent, 1-5% of a curing agent, 1-5% of a curing agent, and the balance of water. 15-35% of aliphatic polyurethane resin with 3-4 functional groups; 15-25% of an active monomer; 0.2-0.5% of a wetting dispersant; 0.5-1% of a dispersant; 0.2%-0.5% of a defoaming agent; 0.1 to 0.2 percent of a flatting agent; 0.5%-0.8% of a fluorocarbon modified leveling agent; 3.5 to 5% of a photoinitiator; 0.5%-2.2% of a functional auxiliary agent; 5-15% of a matting agent; and 0.5-1% of nano aluminum oxide. According to the UV varnish, the flexibility reaches grade 1, the adhesive force reaches grade 0, the yellowing resistance E * is 1.0-1.5 (grade 1), and after a cold and hot cycle test, a paint film is free of cracks, bubbles, gloss loss and the like.

The invention relates to an ultrasonic vibration assisted large-width copper plate strip continuous extrusion short-process technology, and belongs to the technical field of metal processing. A copper raw material is subjected to mechanical cleaning and then ultrasonic cleaning, and the surface cleanliness of the raw material is guaranteed; the cleaned copper raw materials are fed into continuous extrusion equipment, and ultrasonic vibration is adopted for assisting continuous extrusion; after the extruded copper plate strip is cooled, spraying a suspension containing cerium (IV)-sodium dodecyl benzene sulfonate-pyrrolidone nano aluminum oxide additive on the surface of the copper plate strip, and drying; straightening by using a multi-roll straightening machine to obtain a large-width copper plate strip; the cerium (IV)-sodium dodecyl benzene sulfonate-pyrrolidone nanometer aluminum oxide auxiliary agent is prepared from nanometer aluminum oxide, DMF (Dimethyl Formamide), sodium dodecyl benzene sulfonate, N-vinyl pyrrolidone, ammonium persulfate and cerous sulfate (IV); the copper plate strip prepared by the invention has relatively high density, relatively high tensile strength and ductility, and the mechanical property of the copper plate strip is remarkably improved.

The invention provides a recycled aggregate product, a preparation method thereof and recycled concrete, and belongs to the technical field of recycling of building materials. The preparation method of the recycled aggregate product comprises the following steps: S1, crushing waste concrete to obtain crushed concrete; then carrying out sorting treatment and magnetic separation treatment on the crushed concrete to obtain concrete subjected to impurity removal; the concrete subjected to impurity removal is screened, and initial recycled aggregate is obtained; s2, performing soaking treatment on the initial recycled aggregate by adopting strengthening liquid, and then performing dehydration treatment to obtain strengthened recycled aggregate; wherein the strengthening liquid is prepared from potassium silicate, vinyl acetate-ethylene copolymer emulsion, nanometer aluminum oxide, a dispersing agent and water; s3, calcining the reinforced recycled aggregate to obtain a recycled aggregate product. According to the preparation method, high-value utilization of the waste concrete can be achieved, and the obtained recycled aggregate product is excellent in performance.

The invention relates to the technical field of fiber reinforced composite materials, in particular to a basalt fiber reinforced composite board in a dynamic heavy load environment and a preparation method. The basalt fiber reinforced composite board comprises an upper surface layer, an upper reinforcing layer, a core layer, a lower reinforcing layer and a lower surface layer. According to the invention, rigid nanoparticles and carboxyl-terminated nitrile rubber are introduced to construct a rigid-flexible composite toughening system, and nano aluminum oxide and silicon dioxide are taken as rigid particles and are uniformly dispersed in an epoxy cross-linked network, so that slippage and crack propagation of molecular chains can be effectively hindered, and the rigidity and damage resistance of a matrix are improved; meanwhile, the carboxyl-terminated nitrile rubber is used as reactive liquid rubber, after carboxyl of the carboxyl-terminated nitrile rubber reacts with epoxy groups, the carboxyl-terminated nitrile rubber is distributed in a matrix in a sea-island structure and can serve as stress concentration points, a large amount of crazing and shear bands can be induced, and a large amount of impact energy can be consumed; and the impact toughness is greatly improved while the high strength of the material is maintained.

The invention belongs to the technical field of water-based ink, and provides high-temperature-resistant water-based ink for laminated iron and a preparation method thereof.According to the high-temperature-resistant water-based ink for laminated iron and the preparation method of the high-temperature-resistant water-based ink for laminated iron, the design of a double-resin system formed by compounding waterborne polyurethane resin and flexible segment copolymer modified ternary vinyl chloride-vinyl acetate resin is adopted, and the synergistic effect of surface modified nanometer aluminum oxide reinforcing filler and an elastomer modifier is combined; the interface compatibility is improved through a siloxane coupling agent surface treatment technology, a composite coating structure with balanced flexibility and heat resistance is formed, the high temperature resistance can reach 200 DEG C or above, continuous use is free of failure, the flexibility is free of cracking through a T-bend test, the adhesion of a coating film reaches the 0-level standard, the drying time is shortened to be within 30 minutes, and the service life of the coating film is prolonged. The comprehensive performance index that the storage stable period is prolonged to 12 months or above is achieved, the technical problems that an existing laminated iron coating is insufficient in flexibility and poor in thermal stability in a high-temperature environment are solved, and the high-temperature-resistant laminated iron coating has wide food packaging and industrial protection application value.

The invention discloses a self-sensing temperature monitoring cable, method and system for a smart power grid, and the cable comprises a central bearing core and a conductive unit which is twisted on the central bearing core in a surrounding manner. A spiral distributed sensing unit is embedded in a gap of the conductive unit; the distributed sensing unit is formed by compounding a plurality of modified optical fibers and an insulating material; according to the invention, through the curvature conformal design of the gap matching type fan-shaped distributed sensing units and the conductive units, the millimeter-level temperature sensing precision is realized, the problem that the diameter of a cable is increased due to a traditional external sensor is eliminated, and the sensor is compatible with a standard laying pipeline; by utilizing the characteristic that the insulating layer is made of a cross-linked polyethylene base material doped with nano aluminum oxide and the directional heat-conducting micro-channel, the temperature rise rate of a local overheat area is reduced, and the insulation aging is obviously delayed; the physical coordinate reference is established by using the sheath positioning protrusions, the problem of position calibration in distributed temperature measurement is solved, the positioning error is small, and the traceability efficiency of cable fault points is greatly improved.

The invention relates to the technical field of battery materials, in particular to a para-aramid lithium battery diaphragm and a preparation method thereof. The para-aramid lithium battery diaphragm comprises para-aramid slurry and a base membrane, the para-aramid slurry is coated on the two sides of the base membrane to form para-aramid coatings, and the para-aramid slurry comprises the following raw materials in parts by weight: 20-40 parts of modified para-aramid polymer liquid, 10-20 parts of nano ceramic composite material powder and 10-18 parts of a solvent; the nano ceramic composite material powder is prepared from the following raw materials in parts by weight: 50 to 100 parts of nano aluminum oxide, 8 to 12 parts of nano zirconium dioxide, 0.3 to 0.8 part of yttrium oxide, 1 to 5 parts of magnesium nitrate hexahydrate, 0.1 to 1 part of polyacrylic acid, 1 to 2 parts of ammonia water, 1 to 3 parts of coupling agent and 20 to 30 parts of silicon dioxide; the nano ceramic composite material powder is added into the para-aramid slurry, so that the para-aramid diaphragm has better thermal stability, and the phenomenon of thermal shrinkage of the diaphragm at high temperature is reduced.

The invention relates to the field of layered composite fabrics, and discloses a cooling and heat-insulating layered composite fabric and a preparation method thereof. The composite fabric has a multi-layer structure of a coating and a fabric layer, silicon dioxide microsphere loaded maleic anhydride modified PVB and organic silicon modified polyurethane acrylate are introduced into the coating, a light-oxygen dual-curing system is constructed, and silicon dioxide, polyvinyl butyral and polydimethylsiloxane which are good in intrinsic infrared emission performance are introduced, so that the intrinsic infrared emission performance of the composite fabric is improved, and the intrinsic infrared emission performance of the composite fabric is improved. The cooling performance of the coating material is improved through multi-component synergism of nano Al2O3 with good heat reflection performance, and the cooling and heat insulation performance of the composite fabric is comprehensively improved by combining the excellent heat insulation performance of the special-shaped cross-section fibers in the fabric layer.

The application relates to the technical field of paint production, and particularly discloses a composite material modified wear-resistant anticorrosive paint and a preparation method thereof, which comprises the following steps: S1, raw material preparation, wherein high-performance resin, wear-resistant fillers, anticorrosive fillers and functional additives are weighed, the wear-resistant fillers are nano-aluminum oxide, silicon carbide and diamond micro powder, and the anticorrosive fillers are zinc powder, glass flake and mica powder; S2, the weighed raw materials are added into a dispersion grinding device, and are firstly stirred and mixed. The composite material modified wear-resistant anticorrosive paint and the preparation method thereof can improve the wear resistance and the anticorrosive performance of the paint by the wear-resistant fillers and the anticorrosive fillers, such as nano-aluminum oxide, silicon carbide and diamond micro powder, so that the hardness and the wear resistance of the paint are greatly improved, various abrasions can be effectively resisted, and the service life of the coated object is prolonged.

The invention discloses water-based ink as well as a preparation method and a use method thereof, and relates to the field of ink preparation. Comprising the following steps: uniformly dispersing modified nano aluminum oxide, part of water-based acrylic resin emulsion, part of APEO-free wetting dispersant and part of deionized water, and sanding and dispersing until the fineness is less than or equal to 5 microns to obtain slurry; the preparation method comprises the following steps: uniformly mixing a water-based blocked isocyanate cross-linking agent, a flatting agent and part of ATBC to obtain a pre-dispersion; uniformly dispersing the water-based polyurethane dispersion, the defoaming agent, the rest deionized water, the water-based acrylic resin emulsion, ATBC and the APEO-free wetting dispersant to obtain a main resin emulsion phase; and slowly adding the slurry into the main resin emulsion phase, uniformly dispersing, slowly adding the pre-dispersion, uniformly dispersing, adding the thickening agent to adjust the viscosity of the system, and filtering to obtain the target product. The ink provided by the invention has ultralow VOC emission and excellent initial adhesion, adhesion resistance and long-term durability.

The invention provides an epoxy resin wear-resistant coating and a preparation method thereof, and belongs to the technical field of polymer composite materials. The epoxy resin wear-resistant coating is prepared from the following raw materials in parts by mass: 100 parts of epoxy resin, 2 to 20 parts of composite filler, 5 to 30 parts of curing agent, 0.2 to 4 parts of defoaming agent and 0.5 to 5 parts of flatting agent, the composite filler is PTFE and a modified inorganic filler; the modified inorganic filler is a compound system of modified nano SiO2, modified nano ZnO, modified MoS2 and modified nano Al2O3. According to the invention, the antifriction material and the reinforcing material are compounded, and the silane coupling agent is used for surface modification, so that firm combination of the filler and the epoxy resin matrix is realized. MoS2 and PTFE provide a continuous lubricating effect, and the friction coefficient is reduced; the hardness, the strength and the bearing capacity of the coating are remarkably improved through the nano oxide particles, and the coating has the characteristics of low friction and high wear resistance through the synergistic effect of the nano oxide particles and the coating.

The invention relates to the technical field of metal surface protection materials, in particular to a wear-resistant anticorrosive coating based on a nano-composite technology and a preparation method thereof, which are suitable for surface protection of metal pipelines and equipment in harsh environments such as chemical equipment, ocean engineering, electric power facilities and the like. The invention relates to a high-temperature-resistant flame-retardant coating which comprises the following raw material components in parts by weight: 20-30 parts of nano aluminum oxide; 10 to 15 parts of nano titanium oxide; 1 to 3 parts of graphene; 1-3 parts of a composite filler; 3-5 parts of a silane coupling agent; 40 to 50 parts of modified epoxy resin; 10-15 parts of a curing agent; 5-8 parts of a toughening agent; 2-4 parts of an anti-wear agent; and 0.5-1 part of a leveling agent. Under the combined action of all the components, the obtained wear-resistant and corrosion-resistant nano composite ceramic coating for the metal surface has excellent high temperature resistance, corrosion resistance, wear resistance, aging resistance and bonding strength.

The invention discloses an aluminum anodic oxidation electrolyte for improving the adhesion density of an electrode foil oxidation film, and relates to the technical field of anodic oxidation, the electrolyte comprises 3%-10% of ammonium dihydrogen phosphate, 0.5%-3% of sulfuric acid, 0.01%-0.2% of nano titanium dioxide or nano aluminum oxide, 0.05%-0.5% of an organic buffer agent, and the balance deionized water; the organic buffering agent is used for stabilizing the pH value in a range of 4.5-6.0; nano titanium dioxide or nano aluminum oxide is used as an oxidation film nucleation center to promote directional crystallization of gamma '-Al2O3; the sulfuric acid component improves the conductivity of the electrolyte; ammonium dihydrogen phosphate generates an aluminum phosphate barrier layer on the surface layer of the oxidation film to enhance the waterproof performance of the film layer; according to the electrolyte, the adhesion density and crystallinity of an oxidation film can be remarkably improved, the uniformity and waterproof performance of a film layer are improved, the specific volume stability and the formation efficiency are improved, and the electrolyte is suitable for continuous production of the high-performance aluminum electrolytic capacitor.

The invention provides a Pick racket, and relates to the technical field of Pick rackets. The Pick racket comprises a polypropylene foaming inner core and a polypropylene outer shell wrapping the foaming inner core, the foaming inner core and / or the polypropylene outer shell form a handle part, the handle part is sleeved with a TPE handle sleeve, and the surface of the polypropylene outer shell is provided with a user-defined pattern formed through laser; the polypropylene shell is prepared by performing injection molding and curing on a modified polypropylene material, the modified polypropylene material comprises polypropylene resin and laser etching powder dispersed in a polypropylene base material, and the laser etching powder comprises at least one of nano aluminum oxide and modified nano aluminum oxide. The Pick racket provided by the invention is made of a recyclable polypropylene material, so that the environmental protection property of the Pick racket can be effectively improved, and meanwhile, the laser etching effect can be effectively improved by adding the laser etching powder into the polypropylene shell.

The invention belongs to the technical field of polymer insulating materials, and particularly provides a low-temperature-resistant electrical insulating material and a preparation method thereof. The low-temperature-resistant electrical insulating material is prepared from the following raw materials: epoxy resin, a boric acid functional compound, polydimethylsiloxane and carbon fiber cloth, the boric acid functional compound is prepared by reacting modified hyperbranched polyamide-amine, modified nano aluminum oxide and 3-aminophenylboronic acid, and the modified nano aluminum oxide is prepared by modifying nano aluminum oxide with a silane coupling agent. The low-temperature-resistant electrical insulating material prepared by the invention has the advantages of low temperature resistance, self-repairing and excellent mechanical properties.

The application provides a biomass-based hard carbon composite negative electrode material with high capacity and high initial efficiency, and a preparation method and application thereof. The biomass-based hard carbon composite negative electrode material has high capacity and high initial efficiency, and also has excellent cycle performance. AlCl3 and SnCl4 are added into molten pitch, and AlCl3 and SnCl4 react with water in the pitch to generate nano Al2O3 particles and nano SnO2 particles, thereby obtaining modified pitch. After the modified pitch is prepared into a solution, the modified pitch can be filled into pores of a hard carbon precursor and form a coating layer on a surface of the hard carbon precursor in the process of impregnation of the hard carbon precursor. In a high-temperature carbonization process, the hard carbon precursor is converted into hard carbon, nano SnO2 is reduced into nano Sn particles by carbon, and pitch is converted into amorphous carbon. The nano Sn particles, the amorphous carbon and the nano Al2O3 particles are uniformly distributed in pores and on a surface of the hard carbon, and synchronous modification of the inside and the surface of the hard carbon is realized.

The invention relates to the technical field of oilfield chemistry, and discloses an emulsifier, a response agent, a thick oil viscosity reduction method and application. The emulsifier is prepared from nano aluminum oxide, zwitterionic polyacrylamide and alkyl diethylenetriamine according to the mass ratio of 1 to (0.1 to 3) to (7 to 25); wherein the average particle size of the nano aluminum oxide is 30 to 300 nm. When the emulsifier provided by the invention is used for reducing the viscosity of the heavy oil, a stable emulsion can be obtained in the presence of CO2, quick demulsification can be realized by discharging CO2, the stability and quick response effect can still be kept after multiple cycles, and the emulsifier is particularly suitable for reducing the viscosity of the heavy oil.

The invention relates to the field of cables, and discloses a high-voltage fire-resistant cable, which comprises an outer layer, a skeleton structure is arranged in the outer layer, a plurality of groups of wire cores are arranged between the skeleton structure and the outer layer at equal intervals, and a reinforcing core is arranged in the skeleton structure. A middle fireproof layer adopts a ceramic silicone rubber composite system (containing 25 parts of phlogopite, 8 parts of nanometer aluminum oxide and a ceramic accelerant) with an optimized proportion, a hard protective shell with the density being larger than or equal to 1.8 g / cm < 3 > can be rapidly ceramized at the temperature of 320 DEG C, the synergistic flame-retardant effect of surface layer high-flame-retardant PVC (the oxygen index is 32) is matched, and the flame-retardant effect is good; the cable can continuously block heat permeation in flame of 950-1000 DEG C for 180 minutes, the temperature of the inner layer is stably controlled to be below 180 DEG C and is far lower than the insulation tolerance limit of a cable core, the pain point of'rapid failure in fire 'of a traditional cable is thoroughly solved, and golden rescue time is won for power emergency guarantee in key scenes such as high-rise buildings and subway tunnels.

The invention discloses a lightweight heat-insulation cement-based composite material, and relates to the technical field of cement-based composite materials, the lightweight heat-insulation cement-based composite material comprises the following material components by weight: 40-60 parts of a cement matrix, 20-35 parts of a lightweight aggregate, 5-12 parts of a polymer modifier, and 0.5-0.3 part of a functional additive, the cement matrix is sulphoaluminate cement or Portland cement, and the functional additive is a water-based composite material. The lightweight aggregate comprises hollow glass beads with the particle size of 0.1-0.5 mm, expanded perlite with the particle size of 0.5-2 mm and surface modified aerogel particles, the aerogel particles are silicon dioxide aerogel or silicon carbide aerogel, the surface area of the aerogel particles is 700-600 m / g, the pore diameter of the aerogel particles is 40-50 nm, the polymer modifier is acrylate-styrene copolymer emulsion, and the particle size of the polymer modifier is 1-10 m / g. The solid content of the acrylate-styrene copolymer emulsion is 50-45%, the glass transition temperature of the acrylate-styrene copolymer emulsion is-10 DEG C to 15 DEG C, and the functional additive comprises a cellulose ether thickener, a polycarboxylate superplasticizer and a nano aluminum oxide dispersion liquid.