913 results about "Nano carbon" patented technology

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 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 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 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 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 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 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 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.

The invention discloses a PP (polypropylene) material with scratch resistance. The PP material is prepared from the following raw materials in parts by weight: 75-85 parts of a PP matrix; 3 to 8 parts of modified nano silicon dioxide; 5 to 10 parts of an ethylene-octylene copolymer (POE); 2-5 parts of an organosilicon elastomer; 1 to 4 parts of hyperbranched polymer (HBP); 1 to 3 parts of self-repairing microcapsules; 2-5 parts of nano calcium carbonate; 0.3 to 0.8 part of an antioxidant; and 0.5-2 parts of a dispersant. Through the synergistic effect of the modified nano silicon dioxide, the nano calcium carbonate and the hyperbranched polymer (HBP), the surface hardness and the scratch resistance of the PP material are improved, the compatibility of the nano silicon dioxide and the nano calcium carbonate with a PP matrix is enhanced through modification treatment of the nano silicon dioxide and the nano calcium carbonate, and the mechanical property and the wear resistance of the material are improved.

The invention discloses a preparation method of a chemical composite plating solution based on nano niobium carbide. The preparation method comprises the following steps: step 1, pretreating niobium carbide (NbC) powder; step 2, preparing a chemical plating solution, wherein every 1L of the chemical plating solution contains 30g of nickel chloride, 20g of sodium hypophosphite, 10g of sodium citrate, 5g of glycine, 10g of sodium acetate, 0.3 g of sodium dodecyl benzene sulfonate and 80mg of zinc molybdate; fixing the volume to 1L by using distilled water; 3, measuring the niobium carbide suspension liquid, mixing the niobium carbide suspension liquid with the chemical plating solution, and fixing the volume, so that the content of niobium carbide in the chemical composite plating solution is 0.01-0.3 g / L; adjusting the pH value of the solution to 5.8; according to the method, niobium carbide nanoparticles are added into the chemical composite plating solution, so that the surface of a plated part and metal gold are combined with the particles, and the hardness and wear resistance of a base material are effectively improved; the effect on a 60-80-micron nickel-phosphorus coating in the industry is achieved through the ultrathin chemical composite coating (8-10 microns), so that the corrosion resistance and the wear resistance of the product are enhanced.

The invention discloses a high-whiteness EVA chemical foaming sole material and a preparation method thereof, and belongs to the technical field of footwear products. The EVA chemical foaming sole material is formed by chemical foaming of an EVA composite raw material. The EVA composite raw materials mainly comprise 50 to 70 parts of EVA, 20 to 40 parts of an olefin thermoplastic elastomer, 0.4 to 0.7 part of a peroxide cross-linking agent, 2 to 4 parts of an AC foaming agent, 1 to 2 parts of zinc oxide, 0.3 to 0.8 part of 6-hydroxy-1, 2, 3, 4-tetrahydroquinoline, 0.5 to 1 part of nano zinc carbonate and 0.5 to 1 part of pentaerythritol tetrastearate. The whitening effect of the sole material can be realized on the premise of protecting the EVA foaming-crosslinking structure; therefore, the attractiveness of the product is improved, the durability is better, the mechanical properties and other properties of the EVA foamed sole are not influenced, and the high-quality requirements of elasticity, pressure resistance, comfort and the like of sports shoes can be met.

The invention relates to a sealing rubber ring, and belongs to the technical field of sealing materials. The problems that a traditional sealing rubber ring is narrow in temperature resistance range, poor in medium corrosion resistance, unbalanced in mechanics and elasticity, short in anti-aging service life and prone to precipitation and pollution are solved. The material is composed of a base material, a composite anti-precipitation filler and auxiliary components, the base material contains four components including modified fluororubber and the like, the composite anti-precipitation filler contains modified nano calcium carbonate and the like, and the auxiliary components contain vulcanizing systems, reinforcing systems and the like. The modified fluororubber is prepared by a specific process. The preparation method comprises the following steps: banburying, standing, vulcanizing, cooling and removing flash. The rubber ring has the advantages of wide temperature-resistant range, medium corrosion resistance, aging resistance, balanced mechanical properties and no precipitation pollution, and is suitable for industrial scenes with extreme temperature difference, strong corrosion and the like.

The present application provides a solid-state hydrogen storage material and a preparation method and application thereof. Specifically, the preparation method comprises the following steps: (1) ball-milling a magnesium-based alloy powder, a light metal hydride, a nano-carbon material, a composite catalyst powder and an interface modifier to obtain a mixed powder; and (2) sintering the mixed powder under vacuum at 200-350 DEG C for 2-5 hours to obtain a sintered body, wherein: the magnesium-based alloy powder is a Mg-Mn-Al alloy powder; the light metal hydride is a mixture of LiAlH4 and NaBH4; the nano-carbon material is selected from one or more of graphene and carbon nanotubes; the composite catalyst powder is a mixture of TiO2, Fe3O4, CeO2 and La2O3; and the interface modifier is selected from one or more of a silane coupling agent and a titanate coupling agent. The solid-state hydrogen storage material has high hydrogen storage capacity, fast hydrogen absorption and desorption rate and good cycle stability.

This invention provides a method for preparing monodisperse nano-calcium carbonate from calcium-containing industrial solid waste. The method comprises the following steps: S1: mixing calcium-containing solid waste and an ammonium salt solution, reacting the mixture, and filtering to obtain a calcium-containing filtrate; S2: mixing the calcium-containing filtrate, CO2 gas, and a crystal form control agent, reacting the mixture, and filtering to obtain nano-calcium carbonate; S3: mixing the nano-calcium carbonate with an aqueous solution containing a surfactant, reacting the mixture, centrifuging, washing, and drying to obtain monodisperse nano-calcium carbonate. This method improves the calcium leaching rate from calcium-containing solid waste, achieves explosive nucleation and rapid growth of calcium carbonate, enhances the reactivity and reaction time between the surfactant and the nano-calcium carbonate particles, and improves the dispersion and surface modification degree of the calcium carbonate nanoparticles.

The invention provides a method for synthesizing high-valued amorphous calcium carbonate through carbon sequestration of carbide slag, and belongs to the technical field of carbon sequestration and high-valued utilization of industrial solid waste resources. The method comprises the following steps: carrying out active calcium extraction reaction on a dried and ball-milled carbide slag aqueous solution through ammonium chloride, stirring and filtering to obtain a calcium-containing solution; the method comprises the following steps: adding a certain amount of absolute ethyl alcohol and magnesium chloride into a calcium-containing solution, fully stirring, adjusting the pH value to a certain value, and introducing CO2 gas for mineralization reaction to obtain a turbid liquid containing calcium carbonate precipitate; and carrying out centrifugal separation, alcohol washing and drying on the turbid liquid to obtain powder calcium carbonate. According to the method disclosed by the invention, the calcium carbide slag active calcium liquid is extracted by adopting ammonium chloride, and absolute ethyl alcohol-magnesium chloride is added to precisely regulate and control the reaction steps of CO2 and the extracted calcium liquid, so that the CO2 is efficiently fixed, and meanwhile, mineralization is performed to obtain a mixed crystal type amorphous nano calcium carbonate product. According to the technology, double targets of synthesizing high-valued calcium carbonate through carbide slag carbon sequestration are achieved, and an innovative technical path is invented for current solid waste resource utilization.

The invention discloses a preparation method and application of a curable bacterial carrier bed, and relates to the technical field of sewage treatment. Comprising the following steps: mixing shell powder, kaolin and a pore-forming agent, adding water, granulating, rolling into spheres, air-drying, and performing primary sintering to obtain a porous light inner core; uniformly mixing nano calcium carbonate, silicon oxide sol, a binder and water to prepare slurry, spraying the slurry to the surface of the porous light core, imprinting a surface micro-well array through a mold, and then carrying out secondary sintering to obtain a ceramic-coated core; uniformly mixing titanium oxide sol and sodium alginate to obtain a bacteria-philic solution, dip-coating the bacteria-philic solution on the surface of the inner core coated with the ceramic, and forming a gel layer through ultraviolet curing; femtosecond laser etching capillary air channels penetrate to the core layer, the depth of each capillary air channel is 950-1050 microns, and the diameter of each capillary air channel is 180-220 microns; through the innovative combination of a ceramic multi-stage structure and an air touch regeneration mechanism, the problem of flora activity maintenance in fish tank sewage treatment is solved.

The present invention relates to a wear-resistant, spray-free PP material, belonging to the technical field of spray-free plastics. The present invention combines a modified surfactant with a masterbatch, thereby imparting antioxidant properties to the masterbatch while simultaneously improving dispersion and bonding within the polymer. The addition of plant nanofibers renders the material more wear-resistant, and the plant nanocarbon fibers are treated with ionic liquids to enhance their dispersibility and compatibility within the polymer. The PP material of the present invention has excellent wear resistance and good surface aesthetics, requiring no additional spraying treatment. Through refined material proportioning and process optimization, it achieves excellent mechanical properties and environmental friendliness, while also exhibiting good processing performance and stable color distribution.

The invention discloses a manganese-cobalt bimetallic mesoporous molecular sieve integral photo-thermal evaporator and a preparation method and application thereof. Melamine sponge is used as a supporting framework, a molecular sieve catalyst is cross-linked, cured and loaded on the surface of the sponge and in pore channels through sodium alginate and CaCl2, the three-dimensional porous evaporator is formed, and the molecular sieve catalyst is a manganese-cobalt bimetal loaded mesoporous silica microsphere material. Mesoporous silica microspheres MS rich in manganese ions are prepared through a metal coordination micelle self-assembly strategy, then the adhesion characteristic of dopamine hydrochloride is utilized, a cobalt substance is uniformly loaded on the surface of the MS, and calcination is performed in a nitrogen atmosphere to form a metal coupled nanocarbon embedded molecular sieve catalyst; the molecular sieve catalyst and the photo-thermal evaporator can synchronously realize photocatalytic degradation of various pollutants and solar-driven water regeneration, have efficient catalytic performance and photo-thermal conversion performance, can be recycled for multiple times, and have great application prospects.

The invention relates to the technical field of concrete, and particularly discloses quick-setting special mortar for tunnel repair and a preparation method of the quick-setting special mortar. The quick-setting special mortar for tunnel repair is prepared from the following raw materials in parts by weight: 40 to 60 parts of cementing material, 15 to 25 parts of 0.16 to 1.25 mm continuous grading quartz sand, 5 to 10 parts of silica fume, 1 to 5 parts of nano calcium carbonate, 1 to 3 parts of water reducing agent, 1 to 3 parts of reinforced fiber, 2 to 6 parts of styrene-butadiene emulsion and 1 to 3 parts of expanding agent. The preparation method comprises the following steps: mixing and stirring the cementing material, the quartz sand, the silica fume, the nano calcium carbonate, the reinforced fibers, the water reducing agent and the expanding agent to obtain a dry material; adding styrene-butadiene emulsion into the dry material, and stirring to form slurry; and adding water into the slurry according to a water-binder ratio of 0.25-0.30, and stirring to obtain the quick-setting special mortar. The quick-setting special mortar for tunnel repair has the advantages of high strength, high durability and high impermeability.

The invention discloses an anti-aging and low-temperature-resistant PVC (polyvinyl chloride) foaming material with flexibility and strength and a preparation method of the anti-aging and low-temperature-resistant PVC foaming material. Comprising the following components: 60-80 parts of polyvinyl chloride resin, 10-20 parts of chlorinated polyethylene (CPE), 5-15 parts of ethylene-vinyl acetate copolymer (EVA), 20-35 parts of a composite plasticizer, 5-12 parts of nano calcium carbonate, 3-8 parts of modified montmorillonite, 6-12 parts of a composite stabilizer, 3-7 parts of a foaming agent, 1-3 parts of a cross-linking agent, 1-3 parts of an antioxidant, 0.5-2 parts of an ultraviolet light absorber, 5-10 parts of a cold-resistant plasticizer and 1-3 parts of a lubricant. According to the invention, the raw material components and the ratio are reasonably selected, so that the prepared PVC foaming material has good flexibility and strength. The addition of chlorinated polyethylene and ethylene-vinyl acetate copolymer can improve the flexibility of the material, the addition of nano calcium carbonate and modified montmorillonite enhances the strength of the material, and the use of the composite plasticizer also plays a positive role in the balance of flexibility and strength.

The application discloses an environment-friendly degradable plastic food packaging bag and a preparation method thereof. The food packaging bag comprises the following raw materials in parts by weight: PBAT 90-100 parts, PLA 10-20 parts, antibacterial modified nano calcium carbonate 15-20 parts, polyethylene wax 1-2 parts, and titanium dioxide 1-2 parts. PBAT and PLA are used as the base material in a large proportion and a small proportion respectively. When the component ratio is greatly different, the intermolecular force between PBAT and PLA is stronger, and the miscibility is better. The two base materials are first mixed to prepare base particles. When the base particles are mixed with other components, better compatibility is achieved. The prepared degradable plastic food packaging bag has more excellent mechanical properties. When the antibacterial modified nano calcium carbonate is melted with other components of the plastic food packaging bag, better compatibility is achieved, and the fluidity of the material during melting is better. Meanwhile, the prepared plastic bag is not easy to precipitate, and the antibacterial performance of the plastic food packaging bag can be maintained for a long time.

The application discloses a kind of high-performance coiled material powder coating and preparation method thereof, belong to powder coating technical field, the application is by the compounding of organosilicon modified epoxy resin and carboxyl-terminated polyester resin, after organosilicon modification, the segment of introduction-Si-O-Si in system has high flexibility, and synergistic effect with nano calcium carbonate, it is helpful to balance the adhesion and flexibility of coating, grafting modification graphene oxide, active chromium oxide is added again, can obviously improve the mechanical strength of coating;After then, phosphite group is grafted onto graphene oxide, and is applied in the present powder coating system, can form three-dimensional network structure in system, chemical bond effect, not only can improve its crosslinking stability in system, and the sheet structure of graphene oxide, also can play certain barrier property, can also give coating longer weather resistance, and active chromium oxide synergistic effect is further improved, and the weather resistance and corrosion resistance of coating.

The invention relates to a starch pore-enlarging type high-chlorine-capacity long-acting high-temperature dechlorinating agent and a preparation method thereof, and belongs to the technical field of dechlorinating, the starch pore-enlarging type high-chlorine-capacity long-acting high-temperature dechlorinating agent comprises the following raw materials: complexing coating calcium hydroxide, modified hydroxyapatite, a composite inorganic adhesive, reinforcing and toughening whiskers, a composite pore-forming agent, a composite synergist, nano calcium carbonate and water; according to the starch reaming type high-chlorine-capacity long-acting high-temperature dechlorinating agent obtained by the invention, the breakthrough chlorine capacity is 40.9 to 44.9 percent, the crushing strength is 139 to 151N. Cm <-1 >, and the abrasion rate is 0.8 to 1.5 percent.