147 results about "Nanostructured carbon" patented technology

This invention discloses a composite additive for repairing the foaming properties of recycled polystyrene, relating to the field of recycled polystyrene. It comprises: 30-50 parts of a matrix repair component, 20-35 parts of a nucleating-reinforcing composite component, 10-20 parts of an antibacterial and flame-retardant composite component, and 5-10 parts of a dispersant. Modified rosin ester and polybutadiene oligomers are used as the matrix repair component, combined with nano-calcium carbonate and talc as the nucleating-reinforcing composite component, and further combined with phytic acid and quaternized chitosan functional components and zinc stearate dispersant to form a stable composite system. This system imparts antibacterial and flame-retardant properties to the product, solving the problem of single-function traditional additives, significantly improving the quality of recycled material products, realizing high-value utilization of recycled materials, and simultaneously repairing damaged molecular chains in recycled materials, improving processing flowability and cell nucleation effect, thus compensating for the deficiency of reduced foaming performance in recycled polystyrene.

The application discloses a preparation method of a high-wear-resistance railway turnout coating and relates to the technical field of railway turnout coatings. A surface grafted modified nano tungsten carbide reinforcing phase is formed; a nano composite pre-alloy powder is obtained; a spherical high-entropy alloy composite spraying powder with high fluidity is obtained; a rough anchoring surface with a micron-level staggered grid structure is constructed on the surface of a base material; a base coating substrate with a thermal expansion gradient buffer feature is obtained; an initial cladding coating workpiece is obtained; and the high-wear-resistance railway turnout coating is prepared. The application excludes closed pores in the powder, and significantly improves the density and fluidity of the powder.

To provide a surface protection film and optical component that are less prone to an increase in surface resistivity and that are easy to inspect visually. [Solution] The surface protection film 10 comprises a base film 1 made of a transparent resin, an antistatic layer 2 formed on one side of the base film 1, and an adhesive layer 3 formed on the side of the base film 1 opposite to the antistatic layer 2. The antistatic layer 2 contains nanocarbon. The thickness of the antistatic layer 2 is 0.05 μm or more and 1.50 μm or less. The haze value of the surface protection film 10 is 4.0% or less. The total light transmittance of the surface protection film 10 is 80.0% or more.

The application relates to the technical field of nanometer carbon material preparation, in particular to a nitride / carbide-doped graphene composite material and a preparation method and application thereof. A physical peeling method is used to treat graphite raw materials to obtain intrinsic graphene powder; the intrinsic graphene powder is mixed with powder of at least one oxide ceramic precursor, the intrinsic graphene powder is coated on the surface of the oxide ceramic precursor powder to form a composite precursor; the composite precursor and at least one doping precursor are subjected to high-temperature reaction in a protective atmosphere, the oxide ceramic precursor is reduced and nitrided or carbonized into a corresponding nitride or carbide ceramic phase, meanwhile, the intrinsic graphene is doped to obtain the nitride / carbide-doped graphene composite material. The composite material has excellent heat conduction performance, predictable catalytic activity and mechanical performance, and can be widely applied to heat dissipation of advanced electronic components, high-strength structural ceramics or replacement of noble metals as chemical catalysts.

This invention relates to Joule-cured multi-component solid waste polymer concrete and its preparation method. It utilizes Joule heat generated by electricity to cure the polymer, significantly improving curing efficiency and the mechanical properties of the polymer concrete. If the water-cement ratio in the concrete raw materials is not higher than 0.3, nano-carbon fibers need to be added to the raw materials; if the water-cement ratio is higher than 0.3, nano-carbon fibers are not initially added. Carbon fibers, or a mixture of carbon fibers and nano-carbon fibers, are uniformly dispersed in water before being added to a uniformly mixed precursor powder. Finally, steel fibers are added and mixed uniformly to form a slurry with a multi-level conductive network. The raw materials include: precursor powder, alkali activator, steel fibers, carbon fibers, and water. The steel fibers account for 0.5~2.5 vol% of the precursor powder, the carbon fibers for 0.4~1.0 vol%, the nano-carbon fibers for 0~0.10 vol%, and the water for 0.2~0.43 wt% of the precursor powder.

The application relates to a high-cycle-stability lithium iron phosphate positive electrode material and a preparation method thereof. 1‑x‑y V x Al y PO4 of an olivine structure, wherein 0.02<=x<=0.05 and 0.01<=y<=0.04; the lithium iron phosphate positive electrode material core surface further contains a gradient coating layer, the coating layer close to the core is a mixed layer of nano boron carbide and amorphous carbon, and the outer layer is a pure amorphous carbon layer. Through double-layer coating and addition of the components Al and V in the core, the cycle performance and the electrochemical performance are effectively improved, the compaction density of the lithium iron phosphate positive electrode material is 2.61-2.81 g / cm 3 , the initial discharge specific capacity is 163.1-169.3 mAh / g at 0.1 C, and the capacity retention rate is 94.1-95.8% after 1000 cycles.

This invention discloses a low rolling resistance, high wear resistance, tear resistance, and energy-saving conveyor belt cover rubber and its preparation method, belonging to the technical field of conveyor belt cover rubber. The cover rubber is a vulcanized rubber composite with a self-layering structure, comprising, sequentially from the working surface of the cover rubber to the bonding surface with the belt core. This invention utilizes a vulcanized rubber composite with a self-layering structure to form a wear-resistant surface layer, a tear-resistant intermediate layer, and an adhesive bottom layer sequentially from the working surface to the bonding surface with the belt core. By utilizing the selective distribution of oxidized carbon nanospheres, modified basalt short fibers, and modified layered silicates during the latex co-precipitation process, the concentration of oxidized carbon nanospheres in the wear-resistant surface layer is not less than 85% of the total, the concentration of modified basalt short fibers in the tear-resistant intermediate layer is not less than 80% of the total, and the adhesive bottom layer is a pure rubber layer. This achieves a synergistic improvement in low rolling resistance, high wear resistance, and high tear resistance in a single cover rubber, resolving the contradiction that traditional cover rubbers struggle to achieve these properties simultaneously.

This invention provides nano-tungsten carbide and its preparation method. The preparation method includes: providing ammonium paratungstate; calcining the ammonium paratungstate to form purple tungsten; oxidizing the purple tungsten in pure oxygen to form yellow tungsten; ball milling the yellow tungsten with carbon, then isostatically pressing it into a block, followed by carbon reduction to obtain a tungsten-carbon mixed block; carbonizing the tungsten-carbon mixed block, and then crushing it to obtain nano-tungsten carbide powder. This invention can reduce the manufacturing cost of nano-tungsten carbide and is beneficial for preparing finer tungsten carbide powder.

This invention relates to a silicone rubber adhesive and its preparation method, belonging to the technical field of silicone rubber adhesives. The silicone rubber adhesive comprises the following components: 100 parts of hydroxyl-terminated polydimethylsiloxane and nano-calcium carbonate, of which 40 to 60 parts are nano-calcium carbonate; 2 to 3 parts of methyltrimethoxysilane; 1 to 2 parts of diisopropyl bis(ethyl acetoacetate) titanate; and 0.3 to 0.7 parts of a tackifier. The tackifier comprises compounds with the general structural formula shown in Formula I or Formula II. Compared with existing silicone rubber adhesives, the silicone rubber adhesive provided by this invention contains a tackifier with a specific structure, which can significantly improve the construction speed, meet the needs of rapid construction, and make up for the shortcomings of existing silicone rubber adhesives.

The invention discloses an organosilicon adhesive for a damp-heat aging resistant galvanized sheet and a preparation method thereof. The organic silicon adhesive comprises the following components in parts by weight: 25-40 parts of hydroxyl silicone oil, 35-50 parts of nano calcium carbonate, 11-21 parts of silica powder, 1-5 parts of a cross-linking agent, 0.4-0.8 part of a catalyst and 2-4 parts of a coupling agent. The organic silicon adhesive disclosed by the invention can keep the performance without obvious attenuation in cold and hot impact, salt mist and ultraviolet aging environments, and particularly can resist water vapor invasion and keep the performance in a damp and hot aging environment. The organic silicon adhesive disclosed by the invention has the capability of bonding low-surface-energy materials such as TPO (Thermoplastic Polyolefin), galvanized sheets and the like, also has good mechanical properties and high and low temperature resistance, and can work in a range of-60 DEG C to 200 DEG C. The organic silicon adhesive provided by the invention can be widely applied to material bonding in the fields of photovoltaics, industry, buildings and the like.

This invention relates to the field of semiconductor manufacturing technology, specifically disclosing a pre-cleaning method for silicon carbide polished wafers. The method first utilizes an organic cleaning solution coupled with polishing and ultrasonication to efficiently remove wax and organic contaminants, and loosen the nano-carbon cluster structure. Then, a hydrogen peroxide-hydrofluoric acid composite system is used to renew the oxide layer and fix metal contaminants in situ. Subsequently, a sulfuric acid-hydrogen peroxide high-temperature strong oxidation system is used to deeply decompose the nano-carbon clusters and complex organic matter. Finally, under the synergistic effect of ultraviolet photocatalysis and pulsed megasonic waves, a composite cleaning solution of oxalic acid and hydrogen peroxide is used to achieve efficient chelation and desorption of metal ions, forming a stable passivation film on the surface. This method can stably control the surface roughness (Ra) of the silicon carbide substrate below 0.2 nm, while completely breaking the vicious cycle of "cleaning-residue-recontamination," significantly improving cleaning efficiency and substrate surface quality.

The application provides a low-corrosion TOPCon silver paste, a preparation method and application thereof, and belongs to the field of solar cells. The TOPCon silver paste is composed of the following components: 40-70 parts of silver powder, 5-25 parts of silver-coated tungsten, 1-5 parts of glass material, 1-5 parts of modified nano calcium carbonate, 10-15 parts of organic carrier, and 0.5-2 parts of organic additive. The modified nano calcium carbonate is uniformly dispersed on the surface of the glass powder through physical adsorption and chemical bonding, can reduce the corrosion of the silver paste to the surface of the silicon wafer, and maintains the integrity of the surface of the silicon wafer. Meanwhile, the modified nano calcium carbonate forms a dense conductive network in the sintering process, reduces the contact resistance, and improves the conversion efficiency of the battery. In addition, the modified nano calcium carbonate improves the interfacial bonding force between the silver paste and the silicon wafer, enhances the adhesion and tensile strength of the silver paste. Therefore, the corrosion resistance, conductivity and mechanical properties of the silver paste for the TOPCon battery are improved.

The application relates to the technical field of rubber material production, in particular to an EPDM rubber material with self-adhesion after vulcanization and a preparation method thereof. The EPDM rubber material comprises the following components in mass fractions: 70-90 parts of EPDM raw rubber, 3-7 parts of modified resin, 2-9 parts of tackifying resin, 10-25 parts of porous nanometer carbon balls, 6-15 parts of polyester plasticizer, 3-6 parts of nanometer zinc oxide, 1-4 parts of stearic acid, 0.5-2 parts of anti-aging agent, 0.5-2 parts of accelerator and 0.5-3 parts of vulcanizing agent. The EPDM material has the characteristics of strong self-adhesion, no oil separation, high mechanical property and good heat-resistant stability. The modified resin is introduced into the EPDM raw rubber to crosslink with the EPDM raw rubber, the tackifying resin and the polyester plasticizer are used, the mechanical property, heat resistance and self-adhesion of the material are effectively improved, and the porous nanometer carbon balls are introduced to effectively improve the oil separation of the EPDM rubber material.

A powder metallurgy transmission plate material for a clutch, comprising in percentage by mass: 55%-65% of high-purity atomized iron powder, 8%-12% of electrolytic copper powder, 4%-8% of nickel hydroxide powder, 1.5%-4% of ferromolybdenum powder, 1%-3% of chromium powder, 0.3%-1.5% of lanthanum powder, 1.5%-3.5% of nano silicon carbide particles, 0.8%-2% of carbon fiber, 0.5%-1.5% of whisker-like alumina, 0.3%-1% of cellulose nanocrystals, 0.5%-2% of rare earth oxides, 2.3%-6% of a lubricating agent and 0.5%-1.8% of a binder. A transmission plate prepared by using the material component ensures the reliability and durability of the transmission plate in a complex mechanical environment, prolongs the service life of the transmission plate, and reduces safety risks. Also comprised is a preparation method for a powder metallurgy transmission plate material for a clutch.

The application relates to the technical field of nanomaterials, and discloses monodisperse nanometer carbonate and a preparation method and application thereof. The method for preparing the monodisperse nanometer carbonate comprises the following steps: (1) performing acid-base neutralization reaction on a calcium source and / or a magnesium source and a surfactant in the presence of an organic solvent; wherein the calcium source is an alkaline calcium source, the magnesium source is an alkaline magnesium source, and the surfactant is an organic acid; (2) mixing water with the product obtained through the acid-base neutralization reaction in step (1); (3) performing first carbonization reaction on the mixture obtained through step (2) and a carbon source a; (4) performing second carbonization reaction on the product obtained through the first carbonization reaction and a carbon source b; wherein the carbon source a is different from the carbon source b. The monodisperse nanometer carbonate particles disclosed by the application are small in particle size, 1-5 nm in size, small in particle size, uniform in particle size distribution, monodisperse, and good in dispersity.

This invention relates to the field of concrete technology and discloses a crack-resistant and anti-hollow concrete and its preparation method. The concrete, by weight, comprises 350-380 parts cement, 65-85 parts fly ash, 40-50 parts slag powder, 280-300 parts coarse aggregate, 220-260 parts fine aggregate, 2-4 parts basalt chopped fibers, 1-3 parts modified nano-calcium carbonate, 2-3 parts quaternary ammonium salt modified POSS, 1-2 parts polycarboxylate superplasticizer, and 95-110 parts water. This invention utilizes basalt fibers to construct a crack-resistant network, modified nano-calcium carbonate to refine the matrix pores, and quaternary ammonium salt modified POSS to enhance interfacial bonding and system compatibility. The synergistic effect of these three components significantly reduces concrete drying shrinkage, improves tensile strength and interfacial bonding performance, and effectively solves the problems of concrete cracking and hollowness.

This invention relates to the field of shielding materials, and more particularly to a natural rubber-based ionizing radiation shielding material and its preparation method. The material comprises the following components: natural rubber: 60-80 parts; nano-boron carbide: 5-15 parts; nano-high-density metal powder: 15-23 parts; modified gadolinium oxide: 3-10 parts; plasticizer: 3-8 parts; vulcanizing agent: 1-3 parts; accelerator: 0.5-2 parts; antioxidant: 1-2 parts. This invention can effectively shield ionizing radiation while retaining the high elasticity and flexibility of natural rubber, and possesses good processing performance and low cost, thus meeting the diverse needs of different fields for ionizing radiation shielding materials.

This application relates to the field of building materials technology, and discloses a dry-mixed quick-setting mortar for road repair and its preparation process. The mortar is made from a ternary cementitious system composed of sulfoaluminate cement, rapid-hardening silicate cement, and high-belite sulfoaluminate cement, combined with temperature-sensitive microporous mineral composite functional particles, graded fine sand, active admixtures, nano-calcium carbonate, quick-setting agent, and polypropylene fiber. The preparation process employs a two-step mixing process of low-speed premixing and secondary high-speed shear mixing. This invention utilizes the stepped hydration exothermic mechanism of the ternary cementitious system combined with the targeted slow-release mechanism of the temperature-sensitive particles to achieve adaptive control of setting time across the entire temperature range, overcoming the defect of uncontrolled hydration rate under extreme temperature differences. The resulting mortar possesses high early-stage strength and non-regressive later-stage strength, while exhibiting low drying shrinkage and high bonding strength between new and old interfaces, meeting the requirements for rapid all-weather road repair and long-term service.

The application relates to the technical field of high polymer composite materials, and discloses a polyvinyl chloride supercritical gas co-foaming plate and a preparation process thereof. The polyvinyl chloride supercritical gas co-foaming plate comprises the following raw materials in parts by weight: 100 parts of polyvinyl chloride resin, 40-60 parts of a flame-retardant plasticizer, 5-15 parts of nano calcium carbonate, 2-5 parts of epoxy soybean oil, 3-6 parts of a calcium-zinc stabilizer, 0.2-0.5 parts of polyethylene wax and 0.2-0.6 parts of oxidized polyethylene wax. The raw materials are mixed to obtain a pressing material, then carbon dioxide gas is introduced into the pressing material, and the polyvinyl chloride supercritical gas co-foaming plate is obtained under a supercritical process. The polyvinyl chloride supercritical gas co-foaming plate prepared by the application has excellent flame-retardant performance, antibacterial performance, migration resistance and mechanical properties.

The application relates to the technical field of materials, in particular to an anti-erosion low-carbon backing brick refractory material and a preparation method thereof, which comprises fused magnesia coarse aggregate, fused magnesia medium aggregate, fused magnesia fine powder, zircon carbide anchoring modified flaky graphite, boron-doped lignin-based titanium carbide composite powder, nano hafnium carbide and phenolic resin binder; the synergistic protection of the three functional components of the zircon carbide anchoring modified flaky graphite, the boron-doped lignin-based titanium carbide composite powder and the nano hafnium carbide effectively solves the problems that, under the VD vacuum degassing working condition, the MgO in the existing low-carbon magnesia-carbon backing brick reacts with residual carbon in the brick to cause gasification, and the antioxidation additive promotes the reaction and aggravates the damage to the brick structure.

Disclosed in the present invention is a composite powder having a CaCO3@ZnO core-shell structure, the composite powder comprising a nano calcium carbonate core and a zinc oxide shell, wherein the weight of the zinc oxide is 5-15% of the weight of the nano calcium carbonate. The composite powder having a CaCO3@ZnO core-shell structure of the present invention has good dispersibility, has whiteness greater than 95, a uniform zinc oxide coating and a very low content of zinc oxide, and has a good application effect in rubber, thereby achieving the aims of being low cost, having high efficiency and being environmentally friendly.

This invention discloses a gas diffusion layer with multi-level mass transfer channels, its preparation method, and its application. The gas diffusion layer with multi-level mass transfer channels includes a substrate layer and a microporous layer on the substrate layer; wherein the microporous layer comprises carbon black, hollow porous carbon nanofibers, and optionally a hydrophobic binder. This invention uses hollow porous carbon nanofibers as a novel MPL carbon material to synergistically construct a gas diffusion layer with better water vapor management capabilities in conjunction with carbon black particles. The resulting gas diffusion layer exhibits excellent comprehensive performance; its hollow porous structure provides additional water transport channels, improving water vapor transport capacity, thereby enabling the assembled membrane electrode to have better output performance.

The application discloses a ceramic roller rod and a preparation method thereof, and relates to the technical field of ceramic matrix composites.The ceramic roller rod comprises a core layer, a transition layer and a surface layer;the layered gradient structure of the core layer, the transition layer and the surface layer is designed, alumina-zirconia, alumina-mullite and silicon nitride-titanium boride composite ceramic matrices are selected for each layer, and special matrix-reinforcing phase combinations are formed by matching nano silicon carbide particles, boron nitride particles and graphene microsheets;meanwhile, a pretreatment process of separately ball-milling and screening raw materials of each layer is adopted, thus solving the problems of the existing roller rod, such as single matrix matching conventional reinforcing phase, no functional doping ratio and easy agglomeration of overall mixed raw materials, so that the matrix and the reinforcing phase of each layer form material synergy, and the different functional requirements of the core bearing, the intermediate layer connection and the outer surface wear resistance and high temperature resistance are met respectively, and precise adaptation of material performance and functions of each part of the roller rod is realized.

This invention relates to the field of lithium battery negative electrode adhesive preparation technology, specifically to a method for preparing aminosulfonated cellulose salt and its application as a lithium battery negative electrode adhesive. The preparation method includes the following steps: S1, adding sodium carboxymethyl cellulose to an ethanol-water solution and reacting with sulfuric acid to obtain a first product; S2, adding the first product to an ethanol-water solution containing modified nano-calcium carbonate and adding sodium aminosulfonate dropwise to obtain a reaction solution; S3, adding sulfuric acid dropwise to the reaction solution to obtain a second product; S4, adding the second product to an ethanol-water solution and reacting with an alkaline solution to obtain a third product; S5, drying and pulverizing the third product to obtain aminosulfonated cellulose salt. The aminosulfonated cellulose salt prepared by this invention, when applied to the adhesive of the lithium battery negative electrode, can effectively improve the overall flexibility of the material and extend the battery's lifespan.

The application belongs to the technical field of high polymer materials, and discloses a high-barrier flexible heating carbon crystal protective film and a preparation method thereof. The high-barrier flexible heating carbon crystal protective film comprises a base material, the one side of the base material is coated with an adhesion layer, the surface of the adhesion layer is coated with a composite EVA hot melt adhesive layer, the base material is formed into a film through co-extrusion and composite cooling of a modified PA layer and a PE layer, and the modified PA layer comprises the following raw materials in parts by weight: PA6 resin 70-90 parts, micro powder 10-20 parts, MAH-g-PE 3-5 parts, modified heat stabilizer 4-6 parts, wear-resistant additive 5-10 parts, antioxidant 1010 0.3-0.5 parts, silane coupling agent KH-550 1-2 parts, and nano calcium carbonate 2-4 parts. The high-barrier flexible heating carbon crystal protective film adopts the composite film base material of the modified PA layer and the PE layer, has excellent mechanical properties, is not easy to break the film under the condition of curling and bending, and has good heat stability, wear resistance and barrier property.

This application relates to a tensile PVC film and its preparation method, comprising the following raw materials in parts by weight: 100-140 parts by weight of PVC resin, 35-55 parts by weight of dioctyl terephthalate, 3-8 parts by weight of dioctyl adipate, 3-6 parts by weight of zinc-calcium composite stabilizer, 4-6 parts by weight of β-hydroxyethyl acrylate / methylhexahydrophthalic anhydride modified epoxidized soybean oil, 15-25 parts by weight of hydrogenated ricinoleic acid modified nano-calcium carbonate, 8-12 parts by weight of heavy calcium carbonate, 3-5 parts by weight of titanium dioxide, and 0.01-0.03 parts by weight of colorant. This PVC film exhibits good tensile strength and elongation at break, with a longitudinal tensile strength >28.5 MPa, a transverse tensile strength >24 MPa, a longitudinal elongation at break >285%, and a transverse elongation at break >315%.

This invention discloses a microbial self-healing bio-aggregate, belonging to the field of concrete material technology. It is composed of microorganisms, low-alkali cement, synergistic repair components, and nano-active fillers. The microorganisms are *Bacillus pasteurellii*, the low-alkali cement is sulfoaluminate cement, the synergistic repair components include urea as a metabolic substrate and organic calcium salts as an external calcium source, and the nano-active fillers are nano-silica or nano-calcium carbonate. The internal pore pH value of the low-alkali cement stone is 9.0 to 11.0. When the bio-aggregate is incorporated into concrete as a functional aggregate and cracks form along with the concrete, and water enters the cracks, the microorganisms inside the low-alkali cement stone react with the synergistic repair components under the influence of water, forming mineralized deposits at the crack locations to achieve crack repair.