2065 results about "Nanotube" patented technology

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 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 hydrogel-based water-energy-resource co-production solar evaporator and application thereof, and belongs to the technical field of chemistry and environment, the hydrogel-based water-energy-resource co-production solar evaporator is prepared by taking sodium alginate hydrogel as a matrix, adding carbon nanotubes and a titanium-based lithium ion sieve or a metal-doped titanium-based lithium ion sieve into a solution of the sodium alginate hydrogel, taking polyurethane sponge as a carrier frame, and preparing the hydrogel-based water-energy-resource co-production solar evaporator. Ca2 + is adopted as a cross-linking agent to construct a solar evaporator with a flexible size (centimeter-level to meter-level components can be prepared according to application scenes), the solar evaporator is used for the solar driven evaporation process of lithium-containing water resources such as salt lake seawater, and Li + selective enrichment, fresh water collection and waste heat power generation are synchronously achieved. Moreover, the evaporator has the characteristics of simple preparation process, low cost and excellent environmental compatibility, also has a good removal effect on salt ions, and keeps stable fresh water collection performance in a long-time operation process.

The invention relates to the technical field of composite materials, in particular to a high-strength epoxy resin composite material and a preparation method thereof, and the high-strength epoxy resin composite material comprises the following raw materials in parts by weight: 50-80 parts of a base material, 10-20 parts of a curing agent, 5-10 parts of modified carbon nanotubes, 3-10 parts of a reinforcing sheet, 3-6 parts of a reinforcing material and 1-3 parts of a flame retardant. In the preparation method, the modified carbon nanotubes are in chemical bond connection with the base material through surface modification, the interface bonding force is enhanced, stress is effectively transmitted, the unique layered structure and surface modification treatment of the enhanced sheet are enhanced, the enhanced sheet is firmly combined with the resin matrix, and a three-dimensional enhanced network is formed through the synergistic effect of mechanical interlocking and stress dispersion. The vermiculite sheet layer prevents crack propagation, and the modified carbon nanotubes and the reinforcing material effectively transfer stress, so that the tensile strength and bending strength of the composite material are greatly improved, and the high-strength application requirement is met.

The invention relates to the technical field of polyolefin cable materials, in particular to a photovoltaic weather-resistant anti-cracking low-smoke halogen-free flame-retardant polyolefin cable material and a preparation method thereof.The photovoltaic weather-resistant anti-cracking low-smoke halogen-free flame-retardant polyolefin cable material is prepared from, by weight, 90-150 parts of polyolefin resin, 1-3 parts of antioxidant, 2-5 parts of ultraviolet light absorber, 30-70 parts of composite flame retardant, 10-25 parts of carbon black and 3-5 parts of cross-linking agent; the composite flame retardant comprises a core material, a first shell material and a second shell material, the core material comprises a halloysite nanotube adsorbed with a flame retardant, the first shell material comprises epoxy resin, and the second shell material comprises maleic anhydride grafted polyethylene. According to the polyolefin cable material provided by the invention, the purpose of efficient flame retardance can be achieved by adding the halloysite nanotubes and the flame retardant system, the interfacial compatibility between the flame retardant and the matrix resin can be improved by adding the maleic anhydride grafted polyethylene, and the flame retardance of the polyolefin cable material can be improved by combining the added halloysite nanotubes and epoxy resin. The purpose of improving weather resistance, stress resistance and crack resistance of matrix resin is achieved.

The invention discloses a lithium ion capacitor negative electrode based on an MXene carbon nanotube composite material and a preparation method thereof, and the main points of the technical scheme are that the lithium ion capacitor negative electrode based on the MXene carbon nanotube composite material is composed of an MXene sheet layer, a hydroxyl modified carbon nanotube and a binder; the MXene sheet layer is Ti3C2Tx, the interlayer spacing is 1.0-1.3 nm after the MXene sheet layer is etched by hydrofluoric acid, and the content of-OH functional groups on the surface accounts for 40-60% of the total functional groups; the diameter of the hydroxyl-modified carbon nanotube is 10 to 30 nm, the length of the hydroxyl-modified carbon nanotube is 500 to 2000 nm, and the hydroxyl modification degree of the hydroxyl-modified carbon nanotube is 2.5 to 4.0 mmol / g; the mass ratio of the MXene sheet layer to the hydroxyl modified carbon nanotube is 7: 3-8: 2, and the MXene sheet layer and the hydroxyl modified carbon nanotube are combined through hydrogen bonds to form a layered porous structure.

The invention discloses a surface oxidation monatomic nano-alloy catalyst as well as a preparation method and application thereof, and belongs to the technical field of advanced nano-energy materials and electro-catalysis. A surface-oxidized monatomic nano-alloy catalyst comprises a hydroxylated carbon nanotube carrier and bimetallic nano-alloy particles loaded on the hydroxylated carbon nanotube carrier, in the bimetallic nano-alloy particles, non-noble metal elements are dispersed in noble metal nano-particles in a monatomic form, the size of the bimetallic nano-alloy particles is 3-4 nm, and the surface-oxidized monatomic nano-alloy catalyst is prepared from a surface-oxidized monatomic nano-alloy catalyst. An oxide layer with the thickness of 0.3-0.6 nm is arranged on the surface of the bimetallic nano-alloy particle; the loading amount of the noble metal is 5-15wt%. Ruthenium and other non-noble metal elements are alloyed and anchored on the carbon material substrate, the conductivity of the catalyst can be greatly improved, the size of alloy particles is accurately controlled within the range of 3-4 nm, active sites can be exposed to the maximum extent, and structural stability is considered.

The present invention provides a high-thermal-conductivity and high-thickness graphene composite film and a preparation method therefor. The graphene composite film has a thickness of 1-2 mm, a thermal conductivity in the horizontal direction of 1500-1800 W / m•K and a thermal conductivity in the vertical direction of 100-200 W / m•K. The graphene composite film is obtained by mixing, coating, drying and sintering raw materials comprising a graphene oxide slurry, carbon fibers, carbon nanotubes and an adhesive dispersant, wherein on the basis of the mass of the graphene oxide slurry, the mass percentage of the carbon fibers is 4-7%, the mass percentage of the carbon nanotubes is 5-10%, and the mass percentage of the adhesive dispersant is 5-10%. The graphene composite film uses graphene oxide as a base material, and carbon fibers and carbon nanotubes of a certain length and diameter are added thereto to create a thermal conduction channel in the vertical direction. The synergistic combination of the three raw materials solves the current defect of it being difficult to balance the thickness and axial thermal conduction performance of a graphene film.

The invention belongs to the technical field of temperature control, and provides a temperature control system of a carbon nanotube master batch production line, which comprises a process data acquisition module for acquiring process state data of the production line in the production process of the carbon nanotube master batch; and the dynamic cooperative control module is used for dynamically generating and outputting a cooperative adjustment instruction when the process state data deviates from the control target by taking the preset melt viscosity range and the specific mechanical energy range as the control target based on the obtained process state data. A composite control mode of feed-forward prevention and feedback fine adjustment is formed through feedback adjustment of the disturbance feed-forward compensation module and dynamic cooperative control, technological parameter drift caused by internal and external interference is restrained, a production line can still keep high stability when facing frequent or unpredictable disturbance, and the reject ratio of products is reduced.

The invention belongs to the technical field of wind turbine blade anti-icing and deicing, and particularly relates to a carbon nano tube-graphene composite electric heating anti-icing and deicing system which comprises a composite electric heating layer laid on the surface of a wind turbine blade base body and used for generating heat, and the composite electric heating layer sequentially comprises a base layer, a composite conductive layer and an insulation protection layer from inside to outside. The electrode assembly is arranged on the composite electric heating layer and used for supplying power to the composite conductive layer; the ice layer monitoring module is configured to monitor the thickness of the ice layer on the surface of the blade and the environment temperature; and the power supply control module is electrically connected with the electrode assembly and the ice layer monitoring module and is configured to control power supply parameters of the electrode assembly according to the ice layer thickness and the environment temperature. By optimizing the structure of the composite conductive layer and improving the electrode arrangement and intelligent control mode, the thermal response speed is increased, the heating uniformity is optimized, the energy consumption is reduced, the service life is prolonged, and the device adapts to the complex working condition of the wind turbine blade.

The invention relates to the technical field of functional coatings, in particular to a graphene reinforced heavy-duty epoxy coating for a marine environment. The invention discloses a graphene-based epoxy resin coating which is prepared from the following raw materials in parts by weight: 60-80 parts of bisphenol A epoxy resin, 5-10 parts of aminated graphene-carbon nanotube composite powder, 3-6 parts of zinc-aluminum-cerium ternary composite phosphate, 3-6 parts of nano boron nitride / silicon dioxide core-shell particles, 15-25 parts of a polyamide-epoxy curing agent, 1-3 parts of a silane coupling agent KH-560 and 5-8 parts of cashew nut shell oil modified phenolic aldehyde amine. The anti-rust paint is prepared from the following components in parts by weight: 0.5-2 parts of carboxylated graphene quantum dots, 2-4 parts of organic montmorillonite, 0.1-0.5 part of a fluorocarbon surfactant, 8-15 parts of a composite anti-rust pigment and 10-20 parts of an organic solvent. The coating is excellent in corrosion resistance, capable of resisting marine corrosion for a long time, resistant to high temperature and resistant to cathodic disbonding, has the functions of aging tracing and biological adhesion resistance, is convenient to construct and stable in performance, and provides reliable protection for ocean engineering.

The invention relates to a preparation method of a ceramic-based composite material, in particular to a preparation method of a ceramic-based composite material with a pyrolytic carbon-carbon nanotube interface, which is used for solving the problem that in the aspect of improving the thermal conductivity of an interface layer, metals such as Fe, Co, Ni and the like are widely used as catalysts for growing carbon nanotubes at present, so that the thermal conductivity of the interface layer is improved. Carbon nanotubes obtained through a traditional preparation method are prone to agglomeration and uneven in distribution, the risk of the preparation process is high, the carbon nanotubes are not suitable for large-scale production, although metal particles can be reduced through a chemical plating method, the particle sizes of the metal particles are not controlled, the distribution of the metal particles is uneven, and the requirement of a chemical vapor reduction method for distribution of an earlier-stage metal salt solution is high. And the defect is difficult to realize easily. According to the preparation method of the ceramic-based composite material with the pyrolytic carbon-carbon nanotube interface, the ceramic-based composite material with the pyrolytic carbon-carbon nanotube interface is finally obtained through pretreatment, solution A preparation, metal salt solution in-situ reduction and chemical vapor deposition in sequence.

The invention provides a silicon-carbon negative electrode material with a core-shell structure and a preparation method and application of the silicon-carbon negative electrode material. The preparation method comprises the following steps: sequentially preparing a sacrificial layer and a carbon coating layer for coating silicon particles on the surfaces of the silicon particles to form a carbon-coated silicon material; etching the carbon-coated silicon material by adopting an etching agent capable of etching the sacrificial layer, and removing the sacrificial layer in the carbon-coated silicon material to form a silicon-carbon material; dipping the silicon-carbon material in a metal precursor solution, taking out the silicon-carbon material, and drying the silicon-carbon material, wherein simple substances of metal elements in the metal precursor and / or silicides of the metal elements can catalyze the generation of the carbon nanotubes; heating the dried silicon-carbon material in a reducing gas atmosphere to form a catalyst on the surfaces of the silicon particles, the catalyst comprising simple substances of metal elements and / or silicides thereof; and depositing carbon nanotubes on the basis of the elementary substance of the metal element and / or the silicide thereof. The high-rate cycle performance of a battery prepared from the core-shell structure silicon-carbon negative electrode material is obviously improved.

The invention relates to the technical field of fibers, and discloses a thermal insulation polyamide fiber and a preparation method thereof. Polyurethane modified silicon dioxide aerogel with a phase change unit and a heat insulation carrier is prepared, the polyurethane modified silicon dioxide aerogel and epoxidized carbon nanotubes with light absorption and heat generation performance are jointly introduced into PA6 slices, epoxy groups react with carboxyl and amino at the tail end of a PA6 main chain under the melting condition, the dispersity and compatibility of all components in the PA6 slices are improved, and the heat insulation performance of the PA6 is improved. The polyamide fiber prepared by melt spinning not only has good heat insulation performance, but also can utilize the phase change material and the light absorption heating material to store energy and regulate temperature, so that the heat storage and heat preservation performance of the fiber is further improved.

The invention relates to the field of cables, and discloses a flame-retardant impact-resistant cable and a preparation process thereof.The cable sheath layer is prepared from low-density polyethylene, nitrile rubber, ethylene-vinyl acetate copolymer, modified halloysite nanotubes and a flame-retardant additive, the preparation method comprises the following steps: carrying out acylating chlorination on 2, 4-dihydroxyphenyl)-2H-benzotriazole, reacting with 3, 5-di-tert-butyl-4-hydroxybenzylamine to prepare a modified acylating chlorination ultraviolet absorbent, and grafting the modified acylating chlorination ultraviolet absorbent with aminated halloysite nanotubes to prepare the ultraviolet absorbent. The aminated halloysite nanotube is prepared by using gamma-aminopropyl triethoxy silane to modify the aminated halloysite nanotube; the flame-retardant additive is prepared from a flame-retardant intermediate obtained by reaction of diphenyl silanediol and phosphorus oxychloride and phosphonitrilic chloride trimer through a precipitation polymerization method. The added modified halloysite nanotube and flame-retardant additive can endow the cable with excellent mechanical properties, aging resistance, flame retardance and heat resistance.

The invention belongs to the technical field of material preparation, and particularly discloses a carbon nanotube purification method which comprises the following steps: mixing a carbon nanotube crude product with a solvent, and then shearing to obtain a pretreated carbon nanotube; and oxidizing the pretreated carbon nano tube, and then performing acid pickling to obtain the purified carbon nano tube. According to the purification method disclosed by the invention, shearing treatment is introduced to mechanically activate the carbon nanotubes, and is combined with subsequent oxidation and pickling processes to efficiently remove impurity carbon in the carbon nanotubes, so that the purification method is simple, remarkable in purification effect and high in purification efficiency, the purity of the carbon nanotubes can be greatly improved, the damage to the structure of the carbon nanotubes is small, and the method is suitable for industrial production. The method is suitable for large-scale industrial production.

The invention belongs to the technical field of tungsten alloy, and particularly discloses a tungsten alloy electrode material and a preparation method thereof.The tungsten alloy electrode material comprises, by weight, 0.1%-0.2% of lanthanum boride, 0.2%-0.5% of zirconium oxide, 0.2%-0.6% of boron carbide, 0.4%-0.8% of cerium oxide, 0.5%-1.2% of tantalum carbide, 1.4%-1.8% of modified carbon nanotubes and the balance tungsten powder. The lanthanum boride, the zirconium oxide, the boron carbide, the cerium oxide, the tantalum carbide and the modified carbon nanotubes are added into the tungsten powder, under the combined action of the lanthanum boride, the zirconium oxide, the boron carbide, the cerium oxide, the tantalum carbide and the modified carbon nanotubes, the tensile strength and the electrical conductivity are effectively improved, and the high-temperature stability tungsten powder has excellent high-temperature stability and wide application prospects.

The invention discloses a graphene aerogel modified elastic graphite material and a preparation method thereof, and the graphene aerogel modified elastic graphite material comprises the following components by mass: 50-80 parts of crystalline flake graphite; 8 to 15 parts of graphene aerogel; 3 to 8 parts of aminated modified boron-doped carbon nanotubes; 2 to 6 parts of hydroxyapatite-cerium oxide composite nano particles; 1 to 4 parts of a polyimide-montmorillonite nano composite material; 0.5 to 3 parts of titanate coupling agent modified nano silicon dioxide; 1-3 parts of a dispersant; 2-5 parts of a binder; the amination modified boron-doped carbon nanotubes can enhance the electrical conductivity and interface bonding force of the material, the hydroxyapatite-cerium oxide composite nanoparticles improve the high-temperature stability and mechanical toughness of the material, and the polyimide-montmorillonite nanocomposite improves the corrosion resistance and resilience durability of the material. And the titanate coupling agent modified nano silicon dioxide further optimizes the dispersion uniformity of all the components, and the comprehensive performance of the material is remarkably improved.

The invention discloses a plant-based deodorant and a preparation method thereof, and relates to the technical field of high polymer materials. When the plant-based deodorant is prepared, beta-cyclodextrin reacts with paratoluensulfonyl chloride and then reacts with ethylenediamine, and amino modified cyclodextrin is prepared; the plant-based extract is subjected to inclusion with amino modified cyclodextrin, and a cyclodextrin inclusion compound is prepared; the preparation method comprises the following steps: reacting hydroxyethyl cellulose with methacrylic anhydride to prepare double-bond modified cellulose; carrying out hydrothermal reaction on titanium sulfate, the carboxylated multi-walled carbon nanotube, ammonium fluoride and cerous nitrate to prepare a co-doped titanium dioxide / carbon nanotube; coating the co-doped titanium dioxide / carbon nano-tubes with oleic acid to prepare modified nano-particles; and reacting the double-bond modified cellulose with the cyclodextrin inclusion compound, and then copolymerizing with the modified nanoparticles and the comonomer to obtain the plant-based deodorant. The prepared plant-based deodorant has the advantages of good deodorization effect, slow release and photocatalytic degradation.

The invention discloses a novel automobile back view mirror flexible printed circuit board prepared based on weldable silver paste, and belongs to the technical field of electronic materials and devices, conductor patterns in the flexible printed circuit board comprise a main circuit pattern and an auxiliary function structure formed by weldable low-temperature curing silver paste; the curing temperature of the weldable low-temperature silver paste is 125-135 DEG C, and the weldable low-temperature silver paste comprises conductive filler, a polymer resin system, a high-boiling-point ester solvent, a curing agent, a silane coupling agent, a polyamide wax thixotropic agent, a polysiloxane defoaming agent, modified carbon nanotubes, modified aluminum oxide powder, modified barium sulfate and a low-stress modifier. The polymer resin system comprises novolac epoxy resin, biphenyl epoxy resin and a polyacrylate-CTBN copolymer; through the synergistic effect of all the components and an innovative process, comprehensive improvement of mechanical reliability, environmental durability, conductive stability and power load capacity is achieved, and the strict requirement for high reliability of the automobile rearview mirror in an extreme environment is perfectly met.

The invention discloses a novel notebook flexible printed circuit board prepared based on weldable low-temperature silver paste and a backlight module, and belongs to the technical field of electronic materials and devices. Conductor patterns of the flexible printed circuit board comprise a main circuit pattern formed by rolled copper; the auxiliary function structure is formed in a local area of the main circuit pattern by weldable low-temperature silver paste; the curing temperature of the weldable low-temperature silver paste is 130-145 DEG C, the weldable low-temperature silver paste comprises conductive filler, a polymer resin system, an ester solvent, a curing agent, a silane coupling agent, a polyamide wax thixotropic agent, a polysiloxane defoaming agent, modified carbon nanotubes and modified antimony tin oxide powder, and the conductive filler comprises flaky silver powder, spherical silver powder and low-temperature alloy powder. The low-temperature alloy powder is Sn42Bi58 low-temperature alloy powder of which D50 is 12 [mu] m-15 [mu] m; according to the invention, low-temperature curing, high flexibility, excellent conductivity and direct weldability are integrated, and a solution suitable for local repair of a flexible printed circuit board and direct mounting of a jumper and a Mini LED chip is provided.

The invention belongs to the technical field of electric heating deicing, and particularly relates to a surface heating electric heating film and a preparation method thereof. Comprising an outer surface insulating layer, a heating layer, a power supply electrode and an inner surface insulating layer, the heating layer is prepared from a carbon-based conductor composite polymeric material in a printing or coating mode, and the carbon-based conductor composite polymeric material is formed by mixing polyimide resin and carbon fibers (or one or more of graphene, carbon nanotubes and the like). The surface heating electric heating film provided by the invention has the characteristics of simple and reliable structure, light weight and surface heating performance, can be applied to ice prevention and removal operation of parts such as aircraft wings, empennages, propellers and the like, and has relatively high practical application value.

The invention discloses a preparation method and application of a catalyst based on pyridine ionic liquid, and belongs to the technical field of catalyst preparation. According to the invention, a hydrolysis reaction of a silane coupling agent is utilized to prepare a silicon oxide nanotube containing a pyridine unit, and then a quaternization reaction is carried out to obtain the catalyst based on the pyridine ionic liquid. The catalyst has a high specific surface area and a rich pore channel structure, exposure of active sites and contact of the active sites and reactants are facilitated, and the catalytic rate is increased. Meanwhile, the silicon oxide nanotube contains hydroxyl, and can cooperate with a pyridine ionic liquid site to catalyze a carbon dioxide cycloaddition reaction. The obtained catalyst can catalyze the reaction of carbon dioxide and an epoxy compound to prepare cyclic carbonate under solvent-free and metal-free conditions, and the catalyst is easy to recover and simple in product purification, and has a good application prospect.

The invention relates to the technical field of high polymer materials, and particularly discloses a B1-grade low-smoke halogen-free flame-retardant polyethylene cable material and an extrusion molding process thereof. The invention discloses a B1-grade low-smoke halogen-free flame-retardant polyethylene cable material. The cable material is prepared from the following raw material components in parts by weight: 50 to 70 parts of linear low-density polyethylene, 50 to 70 parts of ethylene-vinyl acetate copolymer, 40 to 60 parts of nanoscale magnesium hydroxide, 5 to 8 parts of microencapsulated red phosphorus, 10 to 15 parts of intumescent flame retardant, 3 to 5 parts of zinc borate and 2 to 4 parts of carbon nanotubes. According to the cable material, the ethylene-vinyl acetate copolymer can improve the dispersing performance of the inorganic filler, the composite flame retardant composed of the nanoscale magnesium hydroxide, the microencapsulated red phosphorus and the intumescent flame retardant is utilized, and the synergistic effect of the zinc borate and the carbon nanotubes is matched, so that the obtained cable material has better flame retardance, and the release of smoke is less.

The invention relates to the technical field of composite coating preparation materials for battery diaphragms, in particular to a composite coating for a battery diaphragm as well as a preparation method and application. The invention discloses a graphene quantum dot / carbon nanotube composite material, which is prepared from the following components in percentage by weight: 3 to 8 percent of aminated graphene oxide-polydopamine graft, 10 to 18 percent of polyimide-polyetheretherketone-nano SiO2 hybrid, 2 to 5 percent of hydroxyapatite-montmorillonite core-shell particles, 0.5 to 3 percent of zinc borate-melamine cyanurate compound, 1 to 3 percent of graphene quantum dot-carbon nanotube hybrid, 2 to 6 percent of sodium carboxymethyl cellulose and 50 to 70 percent of deionized water. 0.5 to 2 percent of barium strontium titanate nanocrystalline or 1 to 3 percent of polyethylene glycol-polypropylene glycol segmented copolymer can also be added. All the components are combined through molecular-level reaction to construct a high-performance protection network. The composite coating is good in high temperature resistance and mechanical strength, high in ionic conduction efficiency, excellent in flame retardant effect and good in interfacial compatibility, the preparation process is environmentally friendly and easy to industrialize, the composite coating is suitable for various batteries, and the comprehensive performance of the composite coating is superior to that of a traditional coating.

The present invention provides a modified silica aerogel powder having a higher water repellency and a larger contact angle, and a method for producing the same. At the same time, the present invention provides an aerogel slurry having a lower thermal conductivity and a method for producing the same. The present invention also provides a method for producing an aerogel insulating felt having low thermal conductivity, high mechanical strength, and capable of relatively well resolving the problem of powder shedding. The method for producing the modified silica aerogel powder includes the steps of (1) modifying halloysite nanotubes with dodecyl methacrylate and pentafluorophenyl methacrylate, (2) preparing a silica sol, (3) adding the modified halloysite nanotubes to the silica sol to prepare a wet gel, and (5) preparing the wet gel into the modified silica aerogel powder. The present application also provides a method for producing an aerogel slurry from the modified silica aerogel powder, and a method for producing an aerogel insulating felt from the aerogel slurry.

The invention relates to the field of rubber formulas and manufacturing processes, and provides high-cutting-resistance and impact-resistance side wall rubber of a tensile tire and a preparation method of the high-cutting-resistance and impact-resistance side wall rubber. The sidewall rubber is prepared from components in parts by weight as follows: 60-80 parts of natural rubber, 10-20 parts of emulsion polymerized styrene-butadiene rubber, 10-20 parts of butadiene rubber, 30-40 parts of carbon black, 10-25 parts of white carbon black, 1-5 parts of carbon nanotubes, 1-3 parts of a silane coupling agent, 1-3 parts of tear-resistant resin, 1.5-2 parts of stearic acid, 2-3 parts of zinc oxide, 2-5 parts of an anti-aging agent, 1-2 parts of protective wax, 1-2 parts of an accelerant and 1-2 parts of sulfur. According to the invention, a ternary polymer matrix of natural rubber / emulsion polymerized styrene-butadiene rubber / butadiene rubber is adopted to balance strength, rigidity and toughness, a ternary composite reinforcing system taking carbon black as a main body, a small amount of white carbon black as an auxiliary and carbon nanotubes as a key reinforcing phase is constructed, and the problem of dispersion of the carbon nanotubes is effectively solved by utilizing a multi-section mixing process.

The invention relates to a multi-conductive-agent composite conductive paste for a lithium battery and a preparation method of the multi-conductive-agent composite conductive paste, and belongs to the technical field of lithium battery conductive pastes.The multi-conductive-agent composite conductive paste is characterized in that an iron-molybdenum catalyst is loaded on expanded graphite, then vertical orientation carbon nanotubes and transverse graphene blades are grown in situ, the specific surface area is increased, and the expanded graphite serves as a layered carrier; a metal alloy catalyst can be uniformly loaded in natural pores of the carbon nanotube, a layered framework is kept from collapsing at a high temperature, support is provided for directional growth of a carbon material, electrons can be rapidly transmitted along the carbon nanotube when the composite conductive paste is prepared, gaps of the carbon nanotube are filled by graphene blades, a breakpoint-free conductive network is formed, and the composite conductive paste is prepared. And meanwhile, abundant pores provide channels for lithium ion diffusion, so that the conductive efficiency is improved from the source of the structure, and abundant specific surface area and subsequent nitrogen and sulfur loading provide sufficient sites.

The invention discloses a rapidly synthesized ferric sodium pyrophosphate electrode material, a preparation method thereof and a positive electrode. Relates to the technical field of batteries. The preparation method comprises the following steps: S1, mixing a sodium source, an iron source, a phosphorus source and a carbon source, adding a preset volume of deionized water, and stirring until the raw materials are completely dissolved to obtain a light yellow transparent solution; s2, adding a preset amount of modified carbon nanotubes into the light yellow transparent solution, and dispersing in an ultrasonic environment to obtain a stable suspension; s3, starting a spray dryer, and collecting yellow green spherical precursor powder from a discharge port; s4, placing the yellow green spherical precursor powder obtained by spray drying in a magnetic boat, and carrying out heat preservation at 300 DEG C in a pure argon environment at a heating rate of 2 DEG C / min for 5 h to obtain black powder; and S5, transferring the black powder into Joule thermal equipment, and reacting for a preset time under a preset condition to obtain a final black powdery product. Through innovative process design and material modification, the core problems of long period, poor conductivity, low tap density and the like in the traditional preparation technology are solved.

A tire comprising a rubber composition comprising, based on 100 parts per weight elastomer, a silane-coupled carbon nanotube (CNT) in a polybutadiene masterbatch. The rubber composition further comprises a first elastomer mixed with the masterbatch. The first elastomer can be the same as or different from the polybutadiene in the masterbatch. The rubber composition optionally comprises a second elastomer mixed with the masterbatch. A total elastomer in the rubber composition comprises from about 25 phr to about 75 phr of polybutadiene and from about 25 to about 75 phr of at least the first or second elastomer.