1104 results about "Nano carbon" patented technology

The invention discloses a microencapsulation repairing agent and an intelligent self-repairing ultrahigh-strength ultrahigh-toughness cement-based structural material, the microencapsulation repairing agent is mainly composed of a humidity-responsive outer layer, a pH-responsive middle layer and a temperature-responsive inner layer, and the outer layer is modified with a silane coupling agent. The intelligent self-repairing ultrahigh-strength ultrahigh-toughness cement-based structural material is mainly prepared from the microencapsulated repairing agent, nano carbon black, nano montmorillonite, nano cellulose and other raw materials. According to the invention, by introducing the self-repairing microcapsule with a specific structure and materials such as nano carbon black, nano montmorillonite and nano cellulose, the strength, toughness and durability of the concrete are remarkably improved, and the concrete has an intelligent self-repairing function.

The invention relates to the technical field of plastic cups, in particular to a transparent polypropylene medical plastic cup and a preparation method thereof. The plastic cup comprises the following components in parts by weight: 60-80 parts of polypropylene, 3-8 parts of polyformaldehyde, 5-15 parts of modified nano calcium carbonate, 3-5 parts of kaolin, 2-4 parts of talcum powder, 0.2-0.4 part of a nucleating agent, 0.5-1.5 parts of a lubricant, 1-3 parts of an antioxidant and 0.5-1.0 part of a stabilizer. The preparation method comprises the following steps: uniformly stirring polypropylene, polyformaldehyde, modified nano calcium carbonate, kaolin, talcum powder, a nucleating agent, a lubricant, an antioxidant and a stabilizer to obtain a mixture; the mixture is subjected to melt extrusion, granulation and injection molding to obtain the plastic cup, and the plastic cup not only has excellent mechanical properties, but also has excellent antibacterial properties, and can effectively prevent growth of bacteria.

The invention discloses a preparation process of an aluminum oxide ceramic material, which comprises the following steps: S1, pretreatment of aluminum oxide powder: taking alpha-Al2O3 powder as a raw material, adding a dispersion medium, carrying out ball milling, transferring into an ultrasonic dispersion machine, dispersing, and further carrying out vacuum drying to obtain pretreated aluminum oxide powder; s2, chemical activation treatment: weighing pretreated aluminum oxide, magnesium oxide, nano silicon dioxide, calcium oxide, zirconium dioxide, titanium dioxide and modified nano silicon carbide in parts by weight, mixing, sequentially adding a dispersing agent absolute ethyl alcohol and a KH550 silane coupling agent, stirring at a high speed, adding a polyvinyl alcohol binder, and continuously stirring to obtain ceramic slurry; s3, sieving the ceramic slurry, filling the ceramic slurry into a mold, and performing isostatic pressing to obtain a ceramic green body; and S4, putting the ceramic green body into a box-type sintering furnace, sintering step by step, and cooling to room temperature along with the furnace to obtain the aluminum oxide ceramic material. The prepared aluminum oxide ceramic material has high compactness, excellent dielectric strength and mechanical property, low energy consumption and great application potential.

The invention discloses a waterproof heat-resistant adhesive and a preparation method thereof, and relates to the technical field of adhesives. Tetramethyltri-3-trifluoropropyl cyclotetrasiloxane is used as a raw material to prepare hydroxyl-terminated organic fluorosilicone oil and modified epoxy resin, fluorine atoms are closely arranged around a main chain of the hydroxyl-terminated organic fluorosilicone oil and modified epoxy resin in an umbrella shape, and the hydroxyl-terminated organic fluorosilicone oil and modified epoxy resin cooperate with organic silicon to improve the waterproof and heat-resistant effects; hydroxyl groups on the oxidized carbon nanofibers are reacted and combined with thiocyanate in vulcanized rubber powder, and hybrid filler is formed; residual active groups on the surface of the oxidized carbon fiber are combined and crosslinked with epoxy resin, so that the heat resistance of the epoxy resin is greatly improved; secondly, phenyl maleic anhydride is used as a cross-linking agent to form a three-dimensional cross-linked structure, and meanwhile, phenyl is introduced into the structure, so that the heat-resistant effect and the waterproof effect of the epoxy resin are further improved, and the adhesive prepared by taking the epoxy resin as the raw material has excellent waterproof and heat-resistant performance. The adhesive prepared by the invention has waterproof and heat-resistant effects.

The invention provides a super-hydrophobic / super-oleophylic degradable photo-thermal aerogel adsorption material and demulsification performance thereof, and belongs to the technical field of oil-water separation materials, and the super-hydrophobic / super-oleophylic degradable photo-thermal aerogel adsorption material is prepared by the following steps: (1) extracting cellulose from waste cartons and performing ultrasonic dispersion to prepare a cellulose suspension; (2) preparing a chitosan solution; (3) mixing the cellulose suspension and the chitosan solution to obtain a cellulose / chitosan composite solution, adding nano carbon black particles, glutaraldehyde and a methyltrimethoxysilane aqueous solution into the cellulose / chitosan composite solution, and stirring; (4) injecting the mixed solution into a mold, and performing directional freezing on a semiconductor refrigeration platform; and (5) performing freeze drying on the frozen sample, and then putting the frozen sample into a drying oven for cross-linking to obtain the aerogel. The aerogel is obtained by taking cellulose extracted from waste cartons and chitosan as organic frameworks, carrying out chemical crosslinking through glutaraldehyde, introducing nano carbon black particles as photo-thermal components and carrying out hydrophobic modification through methyltrimethoxysilane, and has an excellent pore structure, super-hydrophobicity-super-lipophilicity and excellent mechanical properties; the adsorbent has efficient adsorption capacity on high-viscosity crude oil; and the device can be repeatedly used and is biodegradable, so that the burden on the environment is reduced.

The invention relates to the technical field of high-corrosion-resistance stainless steel pipe processing, and discloses a high-corrosion-resistance high-molybdenum stainless steel pipe processing technology based on gradient carbide design, which comprises the following steps: applying an axial gradient magnetic field in a stainless steel pipe rolling process, and combining with dynamic strain rate matching rolling to promote molybdenum atom grain boundary migration and inhibit carbide coarsening, so as to obtain a high-molybdenum-resistance stainless steel pipe. Nano carbide smaller than or equal to 50 nm is formed on the surface layer, and submicron carbide of 200-500 nm is formed on the core part; after rolling, micro-arc oxidation and phosphonic acid group silane dipping are immediately carried out to form a self-repairing passivation film; and finally, an alternating magnetic field and pulse current are adopted for cooperative annealing, and a grain boundary molybdenum-poor region and residual stress are eliminated. Through magnetic field-chemical-thermal multi-field coupling, the material has erosion corrosion resistance of a gradient carbide structure, dynamic passive film self-repairing and low-temperature high toughness, and is suitable for long-acting protection of deep sea oil and gas pipelines.

The invention belongs to the technical field of catalysts, and particularly relates to a supported Co-based catalyst with a nano molybdenum carbide auxiliary as well as a preparation method and application of the supported Co-based catalyst. The preparation method comprises the following steps: depositing molybdenum oxide on the surface of a carrier material by adopting an atomic layer deposition method, then carrying out carburizing treatment to obtain a molybdenum carbide catalyst, depositing cobalt oxide on the surface of the molybdenum carbide catalyst by adopting the atomic layer deposition method, and then carrying out reduction treatment to obtain the supported cobalt-based catalyst with the nano molybdenum carbide assistant. According to the preparation method provided by the invention, the size of molybdenum carbide and the dispersity and valence state of cobalt are controlled by regulating and controlling the deposition times of molybdenum oxide, and the prepared catalyst has excellent catalytic activity and stability in the hydroformylation reaction of long-chain olefin with the carbon atom number being greater than or equal to 5.

The invention provides a platinum-carbon catalyst taking hollow carbon nanospheres as a carrier and a preparation method of the platinum-carbon catalyst. The method comprises the following steps: adding a polymer monomer into a nano template dispersion liquid with a uniform size; then adding a proper amount of platinum salt into the solution to obtain a mixed solution, and stirring to react for 0.5-30 hours to obtain a reaction product; and annealing the reaction product, and then removing the nano template to obtain the platinum-carbon catalyst. The obtained platinum-carbon catalyst takes the hollow carbon nanospheres as a carrier and has a larger specific surface area, the platinum catalyst is loaded on the surfaces of the carbon nanospheres and can be in better contact with an electrolyte, and the obtained catalyst has good electrochemical activity and shows excellent electro-catalytic hydrogen evolution performance and oxygen reduction performance; and the related preparation method is simple and reliable, is suitable for preparation of an electrocatalytic hydrogen evolution electrode and an oxygen reduction electrode, and has a good application prospect in the fields of proton exchange membrane electrolytic cells, hydrogen fuel cells and the like.

The invention relates to the technical field of environment-friendly additives, and discloses an environment-friendly additive for soil pollution remediation and an application method thereof.The environment-friendly additive is prepared from 5-20 parts of nano zero-valent iron, 2-15 parts of a nano carbon material and 3-18 parts of a nano mineral composite material; 5-25 parts of biochar, 2-10 parts of microbial flora and 1-10 parts of a plant source extract; 1-8 parts of a pH responsive material; 2-10 parts of a microcapsule material; the particle size range of the nanoscale zero-valent iron is 10-100 nm, and SiO2 or C is coated on the surface of the nanoscale zero-valent iron; the nano carbon material is selected from activated carbon nanoparticles, graphene and carbon nanotubes. The carbon-coated nano zero-valent iron is adopted, so that the technical effects of improving the oxidation resistance of the material and prolonging the active life are achieved. Compared with a traditional technical scheme without coating nZVI, the problems that the composite material is prone to oxidation inactivation and insufficient in long-term repair capacity are solved, and the composite material has more stable heavy metal removal performance in a complex environment.

The invention relates to a high-temperature-resistant light stealth coating material and a preparation method thereof, and belongs to the technical field of functional materials, the high-temperature-resistant light stealth coating material comprises the following raw materials: boride, silicide, a titanate fluxing agent, metal coated carbide, a zinc oxide coated nano carbon material and a sintering aid; according to the prepared high-temperature-resistant light stealth coating material, the infrared emissivity at the wavelength of 3-5 [mu] m is 0.231-0.245, the infrared emissivity at the wavelength of 8-14 [mu] m is 0.424-0.441, the tensile bonding strength is 40.8-46.4 MPa, and the thermal shock resistance frequency is 153-167.

The invention discloses a compound yeast agent for anaerobic degradation of biodegradable plastics. The compound yeast agent comprises the following components in percentage by mass: 0.5-3% of fenpropathrin, 1-6% of nitrite, 1-4% of ammonium molybdate, 5-10% of PLA, 5-10% of nano starch, 3-6% of nano calcium carbonate, 1-5% of carbamide and the balance of a biodegradable resin carrier. The production method comprises the following steps: 1, dispersion treatment; 2, centralization processing; 3, carrying out structured treatment; 4, carrying out carrier implantation treatment; and 5, plasticizing and granulating. The compound yeast agent is added into the plastic, and the addition amount is 1-5%, so that the anaerobic degradation plastic is formed. According to the invention, anaerobic degradation can be regulated and controlled, and more importantly, anaerobic degradation also realizes that the degradable plastic disclosed by the invention is in a normal use condition, the plastic cannot be degraded quickly in light and oxygen environments, the aging property of the plastic is equivalent to that of a resin matrix of the plastic, and the physical and mechanical properties are ensured.

The invention provides weather-resistant anti-freezing road concrete and a preparation method thereof, and belongs to the technical field of concrete. The concrete comprises the following components: sulphoaluminate cement, Portland cement, silica fume, fly ash, modified granite gravel coarse aggregate, medium sand fine aggregate, silica fume blended fiber, silica fume blended polyacrylonitrile fiber, a composite air entraining agent, a functional modifier, a composite antifreeze agent, pre-absorbent zeolite powder and the like. The preparation method comprises the following steps: modifying granite macadam with Al (H2PO4) 3, SiO2 and methoxypolyethylene glycol triethoxysilane, and modifying with a lithium silicate aqueous solution to obtain the modified granite macadam coarse aggregate. The composite air entraining agent comprises a JRY-Q air entraining agent and sodium alpha-olefin sulfonate. The functional modifier is prepared from gas phase method spherical nano silicon dioxide and nano alpha-Al2O3. The composite antifreeze agent comprises ethylene glycol butyl ether acetate and modified calcium carbonate. The modified calcium carbonate is obtained by sequentially modifying nano calcium carbonate with calcium chloride, a KH-550 silane coupling agent and stearic acid.

The invention relates to the technical field of building decoration materials, in particular to a high-performance antibacterial mildew-proof sealant and a preparation method thereof. The sealant is prepared from the following raw materials in parts by weight: 20 to 30 parts of silane modified polyurethane, 40 to 50 parts of nano calcium carbonate, 20 to 30 parts of a plasticizer, 3 to 7 parts of a hydroxyl silane coupling agent, 0.4 to 0.8 part of a mildew preventive, 0.3 to 0.7 part of an ultraviolet light absorber, 0.3 to 0.7 part of a de-foaming agent and 0.8 to 1.2 parts of a first catalyst. The high-performance antibacterial and mildew-proof sealant has long-acting antibacterial and mildew-proof performance, and excellent mechanical performance and weather resistance of the sealant can be maintained, so that the requirements of industries such as building, medical treatment and food processing on high-performance, healthy and environment-friendly sealing materials are met; and the preparation method is simple and controllable, the production cost is relatively low, and large-scale production can be realized.

The invention provides a silicon carbon material with a multilayer coating structure and a preparation method and application thereof, and relates to the technical field of battery materials. The silicon-carbon material with the multi-layer coating structure comprises a porous carbon core body, and a first carbon layer and a second carbon layer which sequentially coat the porous carbon core body from inside to outside, and the porous carbon core body comprises porous carbon and nano silicon particles deposited on the surface and in pore channels of the porous carbon; and a conductive nano carbon filler is dispersed in the second carbon layer. The silicon carbon material with the multilayer coating structure provided by the invention is used as a lithium ion battery negative electrode material, and has excellent specific capacity, coulombic efficiency and cycle performance. The result of the embodiment shows that when the silicon carbon material with the multi-layer coating structure is applied to the lithium ion battery, the first reversible capacity is 1882-2071 mAh / g, the first coulombic efficiency is 92.6-94.1%, and the capacity retention ratio of 100 cycles is 95.3-97.7%.

The invention discloses a hot and moisture dual-cured organic silicon sealant and a preparation method thereof. The organic silicon sealant is prepared from the following raw materials: hydroxyl-terminated methyl vinyl polysiloxane, alkoxy-terminated polydimethylsiloxane, active nano calcium carbonate, fumed silica, a cross-linking agent, a catalyst and a tackifier. The organic silicon sealant organically combines the advantages of a condensation type curing system and an addition type curing system, can be quickly positioned and cured, is high in strength, good in adhesion, excellent in temperature resistance and long in storage life after being cured, and can be used for various occasions needing quick positioning and assembling.

The invention discloses a nickel-based alloy composite plate and a preparation method thereof, and belongs to the technical field of nickel-based alloys, the nickel-based alloy composite plate comprises a stainless steel bottom plate and a nickel-based alloy plate, and the nickel-based alloy plate comprises, by weight, 52-58 parts of nickel powder, 17-21 parts of molybdenum powder, 8-12 parts of copper powder, 7-9 parts of boron powder, 2-3 parts of modified hafnium carbide powder, 4-7 parts of an alloy reinforcing agent and 2-3 parts of a fluxing agent. The modified hafnium carbide prepared from hafnium oxide and nano carbon powder successfully replaces metal hafnium with high cost in the traditional process; and meanwhile, the actual adding proportion of the modified hafnium carbide in the nickel-based alloy plate is greatly reduced, the cost of industrial mass production is doubly reduced from the two aspects of raw material selection and dosage control, and the economic requirement of large-scale production is better met.

The invention discloses a pesticide slow-release granule suitable for simultaneous sowing of pesticide and plant seeds. The pesticide sustained-release granule has double coating layers, the first coating layer takes a pesticide effective component A as a core and a nano calcium carbonate carrier material as a shell, and nano calcium carbonate is used for carrying out first-layer coating on a bactericide effective component through a physical adsorption method; the second coating layer is formed by mixing the first coating layer and the pesticide active ingredient B as a core and taking materials such as attapulgite as a shell. The sustained-release granule has good sustained-release performance, can stably release effective components in a long time, prolongs the pesticide effect period, reduces frequent pesticide application operation, and further improves the pesticide utilization rate.

The invention discloses a core-shell structure nano calcium carbonate antibacterial composite powder and a preparation method thereof.The preparation method comprises the steps that firstly, the surface of nano calcium carbonate is coated with a layer of amorphous TiO2 to form a CaCO3 at-TiO2 core-shell structure, then CaCO3 at-TiO2 reacts with 3-isocyanate propyl trimethoxy silane to generate a Ti-O-Si chemical bond on the surface of the CaCO3 at-TiO2 core-shell structure, and the core-shell structure nano calcium carbonate antibacterial composite powder is obtained; finally, Ag < + > is adsorbed to the surface of CaCO3 (at) TiO2 under the electrostatic action of Si-OH and is reduced into nano silver under the action of sodium citrate, and the CaCO3 (at) TiO2 (at) Ag core-shell structure antibacterial composite powder which is uniform in coating and good in dispersity is formed. The core-shell structure antibacterial composite powder disclosed by the invention shows excellent antibacterial performance in an antibacterial test on escherichia coli and staphylococcus aureus. The method provided by the invention provides a new research thought for preparation of a nano calcium carbonate core-shell structure and a nano silver antibacterial agent.

The invention discloses silencing and mildew-proof organic silica gel as well as a preparation method and application thereof, and belongs to the technical field of organic silicon binding material polymers. Comprising the following components in parts by weight: 35-45 parts of nano calcium carbonate, 32-40 parts of hydroxyl-terminated polysiloxane, 5-9 parts of silencing powder, 0.5-2.5 parts of glass fiber powder, 5-9 parts of a hyperbranched polymer, 2-5 parts of a hydrophobic surface modifier, 1.5-3 parts of color paste, 1-2 parts of a water-based coupling agent, 1-2 parts of a cross-linking agent, 0.5-2.5 parts of a mildew preventive, 0.4-2 parts of a composite titanide and 0.4-0.7 part of nano silver powder. According to the invention, the nano silver powder and the mildew preventive are compounded, and an inorganic sterilization system is combined, so that broad-spectrum environment-friendly bacteriostasis is realized, and high-humidity long-acting protection is met; the powder is subjected to hydrophobic treatment, moisture is blocked, and high adhesion is kept; silencing powder serves as a core, a sound absorption network is cooperatively formed, the noise reduction capacity is improved, and the device is suitable for multiple scenes.

The invention relates to the technical field of secondary batteries, in particular to a dry-method electrode binder, a preparation method of the dry-method electrode binder and an electrode slice, and the dry-method electrode binder comprises the following active ingredients in parts by weight: 0.1-20 parts of a functional nano carbon material; 1 to 40.0 parts of ethylenically unsaturated carboxylic acid; 1 to 50.0 parts of an unsaturated water-soluble monomer; 1 to 80.0 parts of an unsaturated oil soluble monomer; 0.1 to 20.0 parts of an emulsifier; 0.1 to 10.0 parts of an initiator; and 1 to 40.0 parts of a pH regulator. According to the dry-method electrode binder provided by the invention, the acrylic acid copolymer is grafted on the functionalized nano carbon material, so that the binder adopts an acrylic acid structure of a saturated carbon chain and is electrochemically stable in low potential of a negative electrode, and the problems that the potential of PTFE (Polytetrafluoroethylene) in the negative electrode is unstable, lithium in a battery is consumed, and the adhesion effect and the battery capacity are influenced are solved.

The invention discloses a preparation method of a porous nano calcium carbonate filler. The preparation method comprises the following steps: (1) preparing an additive solution I; (2) preparing an additive solution II; (3) preparing an adding solution III; and (4) uniformly mixing a calcium salt solution, the additive solution I, the additive solution II and the additive solution III, then adding a carbonate solution in a stirring state, rapidly stirring until no precipitate is generated after material adding is completed, then carrying out solid-liquid separation, washing a solid phase with deionized water, washing with ethanol, and drying to obtain the porous nano calcium carbonate filler. The nano calcium carbonate filler prepared through the method is of a porous structure, good in dispersity and high in specific surface area, and the performance of a composite material can be remarkably improved when the nano calcium carbonate filler serves as the filler.

The invention discloses a preparation method of a high-conductivity and low-thermal-conductivity carbon-carbon composite material electrode, and relates to the technical field of electrode preparation, the preparation method comprises the following steps: mixing nano carbon spheres, an organic binder and a solvent to obtain a mixed slurry, respectively coating the mixed slurry on a PAN-based carbon fiber web and pitch-based carbon fiber non-woven cloth, and drying to obtain the high-conductivity and low-thermal-conductivity carbon-carbon composite material electrode. Then preparing a preform by alternately laying and needling the PAN-based carbon fiber web coated with the mixed slurry and pitch-based carbon fiber non-woven cloth, pretreating the preform by adopting a chemical vapor deposition technology to obtain an intermediate I, and treating the intermediate I in a pressure impregnation tank and a carbonization and graphitization furnace to obtain an intermediate II; and carrying out pressure impregnation-carbonization treatment on the intermediate II to obtain the carbon / carbon composite material. According to the preparation method of the high-conductivity and low-heat-conductivity carbon-carbon composite material electrode, the material has high conductivity and low heat conductivity, a carrier is provided for precise heat management under specific conditions in a high-temperature furnace, and the energy consumption of equipment is reduced.

The invention discloses an environment-friendly high-toughness flame-retardant ABS (Acrylonitrile Butadiene Styrene) composition as well as a preparation method and application thereof. The environment-friendly high-toughness flame-retardant ABS composition is mainly prepared from the following raw materials in parts by weight: 2 to 3 parts of antimony trioxide, 3 to 6 parts of bromotriazine, 1 to 3 parts of hexabromocyclododecane, 1 to 2 parts of HP-AHB type flame retardant, 80 to 85 parts of ABS resin composition, 0.1 to 0.5 part of anti-dripping agent, 1 to 3 parts of zinc borate and 5 to 10 parts of nano calcium carbonate. The environment-friendly high-toughness flame-retardant ABS composition has the characteristics of high toughness, good flame-retardant effect and the like, and the composite material has the advantages, can be applied to the field of new energy automobiles, and has the advantages of low cost, high economic benefit and comprehensive popularization value.

The invention relates to the technical field of nano calcium carbonate, in particular to a preparation method of nano calcium carbonate for degradable plastics, which comprises the following preparation steps: mixing quicklime and water for digestion to obtain Ca (OH) 2 slurry; adding a chelating agent into the Ca (OH) 2 slurry; transferring to a carbonization reaction kettle, adding a crystal form regulating agent, and introducing a C02 / N2 mixed gas for carbonization reaction to obtain nano calcium carbonate slurry; heating the carbonized nano calcium carbonate slurry to 70-75 DEG C, adding the grafted copolymer A and the grafted copolymer B, and performing ultrasonic dispersion to obtain modified nano calcium carbonate slurry; and adding polyethylene glycol, fully and uniformly mixing, and carrying out filter pressing and spray drying to finally obtain the powdery nano calcium carbonate. Due to the dual interface action of the graft copolymer A / B, the interface defects of the nano calcium carbonate particles and the plastic matrix are reduced, and the tensile strength is improved.

The invention belongs to the technical field of polyester master batches, and particularly relates to a damp-heat-resistant ultraviolet barrier polyester master batch and a preparation method thereof. The invention discloses an anti-ultraviolet polyethylene glycol terephthalate composite material, which is prepared from the following raw materials in parts by weight: 85 to 90 parts of polyethylene glycol terephthalate, 10 to 15 parts of anti-ultraviolet agent, 3 to 5 parts of epoxy-terminated polyether and 1 to 3 parts of lubricant, wherein the anti-ultraviolet agent is a modified intermediate obtained by modifying a nano light screening agent by a carboxylic ester coupling agent according to a mass ratio of (3 to 5): 100; the modified intermediate and a hydroxybenzophenone derivative are subjected to a grafting reaction according to the mass ratio of 100: (5-8); the nano light screening agent is selected from one or a combination of two or more of nano zinc oxide, nano titanium dioxide, nano cerium oxide, nano tin antimony oxide and nano carbon black. The dispersion effect of the anti-ultraviolet agent in the master batch is improved, and the ultraviolet barrier and the light transmittance are improved; meanwhile, the anti-ultraviolet agent is subjected to ester exchange with PET in the screw extrusion process, so that the interaction with PET is enhanced, migration in a humid and hot environment is avoided, and the ultraviolet shielding performance is lasting and stable.

The invention provides a self-repairing microcapsule as well as a preparation method and application thereof, and belongs to the technical field of self-repairing of well cementation cement-based materials in oil and gas well engineering. The preparation method of the self-repairing microcapsule comprises the following steps: uniformly mixing gamma dicalcium silicate powder with nano calcium carbonate powder to obtain a capsule core material; the preparation method comprises the following steps: by taking a mixed solution of ethanol and water as a solvent, sequentially adding a silicon source, a capsule core material and a dispersing agent, uniformly dispersing to form sol, adjusting the pH value to 9-11, and carrying out hydrolytic polycondensation to obtain the silica-coated gamma-type dicalcium silicate and nano calcium carbonate microcapsule; adding the silica-coated gamma dicalcium silicate and nano calcium carbonate microcapsule into an EVA (Ethylene Vinyl Acetate) hot melt adhesive solution, and carrying out spray drying to obtain the self-repairing microcapsule. By the adoption of the technical scheme, the microcracks of the cement stone of the CO2 geological storage well can be effectively and efficiently repaired, and the long-term integrity of the cement stone of the deep well and safe and permanent storage of CO2 can be guaranteed.

The invention relates to the technical field of soil remediation and saline-alkali soil treatment, and discloses a nano-carbon-based slow-release saline-alkali soil conditioner and a gradient controlled release method thereof.The formula comprises a layered nano-carbon matrix, a humic acid intercalation compound, a pH response type cross-linking agent, a calcium ion modifier and a phosphate radical modifier; the method comprises the following steps: constructing a self-regulation repair system for synchronously optimizing salt reduction, nutrient supply and ion balance through a three-dimensional synergistic mechanism of pH response type sodium ion targeted adsorption, microbial activity driven nutrient controlled release and calcium-sodium dynamic replacement. A nano carbon-humic acid layered composite structure is used for synergic desalination and slow-release fertilizer supply, a Ca < 2 + >-PO4 < 3-> gradient ion replacement system is combined for synchronous salt reduction and structure fixation, a pH response coating technology is used for realizing accurate release of nutrients triggered by microbial activity, and a three-dimensional interpenetrating network and graded pores are used for guaranteeing the long-acting stability of the material. And finally, multiple repairing functions are integrated into a single material.

The invention discloses a fine-grain tungsten-nickel-iron composite material and a low-temperature sintering preparation method thereof. The composite material takes W as a hard phase, Ni and Fe as binding phases, Y2O3 as a particle reinforcement phase and a grain growth inhibitor, and Sn as an alloy element and a sintering fluxing agent. The preparation method comprises the following steps: 1, carrying out carbon heat and hydrogen reduction on WO3, NiO, Fe2O3 and nano carbon black to obtain composite powder; 2, carrying out wet grinding with Sn and Y2O3 powder, and drying; 3, compression molding; 4, degreasing and pre-sintering treatment; and 5, low-temperature liquid-phase sintering. According to the composite material, low-temperature liquid-phase sintering is achieved by introducing the Sn element and the Y2O3, the wettability and the interface bonding force between W crystal grains and a bonding phase are improved, and the composite material with uniform components and refined crystal grains is obtained; the preparation method improves the tensile strength, microhardness and room temperature plasticity of the composite material, and is suitable for the fields of aerospace, national defense and military industry, nuclear industry, electronic information, metallurgy and the like.

The invention relates to a surface treatment method of anti-aging nano calcium carbonate for a photovoltaic sealant. Surface treatment is carried out on nano calcium carbonate by using glyceryl monostearate, 2, 4, 6-tri (4-carboxyphenyl)-1, 3, 5-triazine and sodium phosphite, and the nano carbonate treated by the method has relatively high activity and good dispersity, has good resistance to damp-heat aging and ultraviolet aging when being applied to photovoltaic glue, and has good application prospects. Therefore, the problems of aging and yellowing of the existing photovoltaic adhesive are solved.

The invention discloses a silane self-crosslinking polyethylene overhead insulation material for a cable and a preparation method. The insulating material comprises a polyethylene base material, a silane coupling agent, a catalyst, an antioxidant, a nanoscale reinforcing filler, a core-shell structure filler and nano montmorillonite. The polyethylene base material is a blend of polyethylene with different densities and can give consideration to rigidity and toughness; the nanoscale reinforcing filler is nano calcium carbonate modified by silane; the core-shell structure filler takes nano calcium carbonate as a core and an ethylene-octylene copolymer as a shell, so that the processing fluidity can be improved, and the filler agglomeration can be avoided; the nano montmorillonite can improve the aging resistance and the electrical insulation strength. The preparation method comprises the steps of nano filler pretreatment, nano montmorillonite modification, polyethylene base material blending, component mixing, crosslinking and post-treatment, through the pretreatment, modification, optimized mixing and crosslinking processes, it is ensured that all components are evenly dispersed, compatibility is improved, and the processing performance, the mechanical performance and the electrical performance of a finished product are balanced.