645 results about "Hexamethylenetetramine" patented technology

The invention provides a preparation method and application of a dopamine hydrochloride modified cerium oxide core-shell abrasive, and the preparation method comprises the following steps: adding water into cerium salt until the cerium salt is completely dissolved, taking out silicon dioxide micro-powder in which the mass ratio of the cerium salt to the silicon dioxide micro-powder is (0.5: 1)-(7: 1), and ultrasonically dispersing the silicon dioxide micro-powder in absolute ethyl alcohol to obtain dispersion liquid; mixing the dispersion liquid with a hexamethylenetetramine aqueous solution and a cerium salt aqueous solution, heating in an oil bath, stirring and reacting to obtain a mixed solution, centrifuging the mixed solution, washing with deionized water and absolute ethyl alcohol, drying to obtain a mixed solid, and calcining the mixed solid to obtain a cerium precursor; and dispersing the cerium precursor in a mixed solution obtained by deionized water and ethanol, slowly adding dopamine hydrochloride and a buffer solution, stirring, centrifuging, washing and drying to obtain the photocatalyst. According to the polishing solution prepared from the abrasive, the removal rate reaches 0.1458 mg / min.

The invention relates to the field of materials, in particular to a silicon dioxide aerogel composite thermal insulation material and a preparation method thereof. The silicon dioxide aerogel composite thermal insulation material is prepared by taking silicon dioxide aerogel, phenolic resin, a nano zirconium oxide graft and a locust bean gum graft as main raw materials and taking n-pentane, UV-327, hexamethylenetetramine and an antioxidant 1010 as auxiliary materials. The nano zirconium oxide graft and the locust bean gum graft are added into the silicon dioxide aerogel material, so that the prepared silicon dioxide aerogel composite material has excellent heat-insulating property, flame-retardant property and toughening effect, and the comprehensive requirements of the use scene of the silicon dioxide aerogel composite material on toughness and flame retardance are met; and the application market is expanded.

The invention relates to the technical field of polyester, in particular to a flame-retardant and antibacterial dual-function fiber and a preparation method thereof. The flame-retardant antibacterial fiber overcomes the defects that existing fibers are poor in flame retardance and antibacterial property. According to the invention, PET resin, a composite modified auxiliary agent master batch and a composite flexibilizer are used as raw materials, and the bifunctional fiber is prepared through melting and spinning; wherein the composite modified additive master batch is prepared from the following raw materials: PET (Polyethylene Terephthalate) resin, aluminum diethylphosphinate, modified halloysite nanotubes, modified zinc oxide nanowires and zinc borate; the modified halloysite nanotube is prepared from the following raw materials: a halloysite nanotube, KH560 and phosphoric acid; the modified zinc oxide nanowire is prepared from the following raw materials: zinc nitrate hexahydrate, hexamethylenetetramine and sodium hypophosphite. By controlling the dosage of each component and processing technological parameters, the finally prepared difunctional fiber has good flame retardance and good antibacterial property, and is suitable for manufacturing curtains.

The invention discloses a nitrogen-doped zinc ion battery manganese-based positive electrode material and a preparation method and application thereof, and the preparation method comprises the following steps: mixing a strong oxidant and a manganese salt, putting the mixture into a beaker, adding deionized water, and uniformly stirring to form a mixed solution; transferring the mixed solution into a high-pressure reaction kettle with a polytetrafluoroethylene lining, and heating the high-pressure reaction kettle in a drying oven; cooling, precipitating, filtering and washing for multiple times, and then putting into a drying oven for vacuum drying to obtain an original manganese-based positive electrode material; the preparation method comprises the following steps: respectively weighing an original manganese-based positive electrode material and hexamethylenetetramine, flatly laying the original manganese-based positive electrode material at the bottom of a lining of a reaction kettle, and putting the hexamethylenetetramine into a beaker; and putting the beaker into a reaction kettle, moving the beaker and the reaction kettle into a drying oven, and heating to obtain the surface nitrogen-doped manganese-based positive electrode material.

The invention relates to the technical field of refractory materials, in particular to a magnesium-calcium-zirconium-carbon brick production method which comprises the following components in parts by weight: 60-80 parts of sintered magnesium-calcium-zirconium sand particles, 10-30 parts of fused magnesia particles, 2-4 parts of zirconium oxide, 0.5-3 parts of silicon carbide fine powder, 2-6 parts of nano yttrium oxide high-dispersion particles, 1-2 parts of C9 petroleum resin powder, 2-7 parts of graphite, 4-6 parts of binding agent and 0.3-0.5 part of urotropin. The rare earth material nano yttrium oxide high-dispersion particles are introduced, the magnesium-calcium-zirconium-carbon brick has the advantages of high temperature resistance, good hydration resistance, good thermal shock resistance, good oxidation resistance and good erosion resistance, the magnesium-calcium-zirconium-carbon brick is dried by an electric drying kiln as an unburned brick, a tunnel kiln firing process is omitted, the labor cost and energy consumption are reduced, and the production cost is reduced. And the emission of greenhouse gas and toxic and harmful gas generated by fuel combustion is avoided, and the biomass fuel is an environment-friendly product.

The invention discloses a three-dimensional multi-interface heterostructure lithium-sulfur battery interlayer, a preparation method thereof and a lithium-sulfur battery, and the preparation method comprises the following steps: placing acidified carbon cloth in a mixed solution of cobalt nitrate, nickel nitrate and hexamethylenetetramine for primary hydrothermal reaction to prepare NiCo2O4 (at) CC; the NiCo2O4 (at) CC is placed in a mixed solution of nickel chloride and sodium molybdate, a secondary hydrothermal reaction is carried out, and NiMoO4 (at) NiCo2O4 (at) CC is obtained; according to the preparation method, NiMoO4-coated NiCo2O4-coated CC is subjected to thermal reduction annealing in a mixed atmosphere of hydrogen and argon, the three-dimensional multi-interface heterostructure lithium-sulfur battery interlayer is prepared, active sites of the three-dimensional heterostructure are increased, the oxidation-reduction reaction efficiency under high sulfur loading capacity is improved, the nano-particle anchored amorphous nanosheets form the multi-interface heterostructure, and the performance of the lithium-sulfur battery is improved. Good chemical adsorptivity and catalytic conversion on polysulfide in the battery are realized, and the cycle life of the battery is prolonged.

The invention relates to a preparation method of a carbon fiber reinforced carbon aerogel heat insulation composite material, which comprises the following steps: firstly, pre-oxidizing a commercial polyacrylonitrile (PAN) needled felt reinforcement at 195-255 DEG C to obtain pre-oxidized felt reinforcements with different pre-oxidation degrees; uniformly mixing phenolic resin serving as an organic sol raw material, hexamethylenetetramine serving as a cross-linking curing agent and normal propyl alcohol serving as a solvent according to a proper proportion to form organic sol; secondly, the pre-oxidized felt blank body is placed in a stainless steel mold, organic sol is poured into the stainless steel mold, the pre-oxidized felt is completely immersed in the sol, and the pre-oxidized felt reinforcement is fully soaked in the organic sol under the vacuum negative pressure condition; sealing the stainless steel mold dipped with the pre-oxidized felt, and curing and aging for 40-80 hours at 80 DEG C to obtain pre-oxidized felt reinforced organic wet gel; placing the wet gel at room temperature for 24 hours, and drying the wet gel in an air dry oven at 60 DEG C for 72 hours to obtain pre-oxidized felt reinforced organic aerogel; and finally, carbonizing the pre-oxidized felt reinforced organic aerogel at 850-1100 DEG C for 3 hours by using a vacuum carbonization furnace at a heating rate of 3-5 DEG C / min to obtain the carbon fiber reinforced carbon aerogel composite material.

The invention relates to the technical field of capacitor electrode materials, in particular to a biomass derived porous carbon and layered double hydroxide (LDH) composite material and a preparation method and application thereof. The invention provides a preparation method of a biomass-derived porous carbon and LDH composite material, which is characterized by comprising the following steps: mixing biomass-derived porous carbon, nickel salt, cobalt salt, ethylene glycol, hexamethylenetetramine and water, and carrying out hydrothermal reaction to obtain the biomass-derived porous carbon and LDH composite material, the pore structure of the biomass derived porous carbon comprises micropores, mesopores and macropores. The biomass derived porous carbon and LDH composite material has good specific capacitance, energy density and cycling stability, and can be used as a high-performance supercapacitor electrode material.

The invention relates to the technical field of wastewater treatment, and provides a treatment method of glycine production wastewater. The treatment method of glycine production wastewater comprises the following steps: (1) rectifying glycine wastewater to recover methanol, adding dilute sulphuric acid to adjust the pH value to 2.5-3.0, stirring, and standing; (2) transferring the supernate into another container, adding a ZIF-8 modified material, stirring, standing, filtering, collecting filter residues and filtrate, washing the filter residues with diethyl ether, and recovering urotropine; and (3) evaporating and concentrating the filtrate under the vacuum condition of-0.08 MPa and the temperature of 50-60 DEG C, and separating out high-purity ammonium chloride crystals. According to the treatment method for the glycine production wastewater, the problem that an existing treatment method is poor in removal effect on urotropin in the glycine production wastewater is solved; and the treated glycine production wastewater reaches the discharge standard.

The embodiment of the invention relates to a composite material as well as a preparation method and application thereof, and the preparation method comprises the following steps: dissolving phenolic resin in absolute ethyl alcohol, adding hexamethylenetetramine, and uniformly mixing to obtain a first solution; dissolving a metal salt used for synthesizing a metal organic framework compound MOFs in absolute ethyl alcohol, and then adding a ligand to obtain a second solution; adding the first solution into the second solution, and carrying out heat treatment, so that the phenolic resin and hexamethylenetetramine are subjected to a sol-gel reaction and the metal salt and the ligand are subjected to a complexation reaction, and MOFs / phenolic resin wet gel is obtained; the MOFs / phenolic resin wet gel is subjected to drying treatment, and MOFs / phenolic resin aerogel is obtained; under the inert atmosphere, the MOFs / phenolic resin aerogel is placed in a rotary furnace to be subjected to carbonization treatment, and a carbonized compound is obtained; and activating the carbonized compound in the atmosphere of carbon dioxide and water vapor, and cooling in an inert atmosphere to obtain the composite material.

The invention discloses a method for preparing battery-grade iron phosphate by utilizing phosphated residues. The method comprises the following steps: pre-treating the phosphated residues; alkaline leaching is conducted on the phosphated residues, wherein the phosphated residues are placed in a sodium hydroxide solution with the mass fraction being 30%; decoloring is performed; acid treatment: adding hydrochloric acid into the filtrate to adjust the pH value, adding a solution composed of urotropin, thiourea, tetraethylammonium oxalate, hydrogen peroxide and polydodecyl acrylamide acrylic acid, and stirring; extracting: adding an extracting agent and an organic solution, and extracting under a stirring condition; precipitating: heating the raffinate, adding hexadecyl trimethyl ammonium chloride, and stirring; then adding a ferric nitrate solution to carry out precipitation reaction; the method for preparing the battery material ferric phosphate product by taking phosphated residue solid wastes generated in the steel metal product process as raw materials through the steps of pretreatment, alkaline leaching, decoloration, acid treatment, extraction, precipitation reaction and the like has the advantages of simple process, high product quality, low production cost, high recovery efficiency of phosphorus resources in the waste residues and the like.

The invention discloses a modified phenolic resin and a preparation method thereof, and belongs to the technical field of phenolic resins, the modified phenolic resin comprises the following raw materials by mass: 100 parts of phenol, 140-145 parts of a formaldehyde aqueous solution, 25-30 parts of gradient topology phosphonate, 15-17 parts of hyperbranched siloxane, 12-14 parts of a dynamic borate cross-linking agent, and 3-4 parts of hexamethylenetetramine. Through the synergistic effect of the gradient topology phosphonate, the hyperbranched siloxane and the dynamic boric acid ester cross-linking agent, the flame retardance, the thermal stability, the mechanical property and the dynamic function of the phenolic resin are comprehensively improved, and the environmental protection property of the phenolic resin is remarkably superior to that of a traditional technology. The experimental data fully verifies the inseparability and synergistic interaction among innovation points, and the technical combination and effect are non-obvious and accord with the creativity requirement of the patent. In addition, the application potential of the resin in the fields of aerospace, electronic packaging and the like further highlights the industrial value of the resin.

The invention provides a silicon-carbon negative electrode material, a preparation method thereof, negative electrode slurry, a negative electrode plate and application. The invention provides a preparation method of a silicon-carbon negative electrode material, which comprises the following steps: S1, mixing linear phenolic resin with an organic solvent, sequentially adding urotropine, carbon nanotubes, a defoaming agent and polycarbosilane, and mixing to form a mixture; s2, drying, cross-linking, carbonizing, activating and cooling the mixture to obtain a porous carbon material; s3, silane mixed gas is introduced into the porous carbon material, silane deposited porous carbon is obtained through deposition, then acetylene mixed gas is introduced, nitrogen is introduced after acetylene deposition, and the silicon-carbon negative electrode material is obtained through cooling; wherein the polycarbosilane is a compound as shown in a formula I, and n ranges from 1000 to 2000. According to the negative electrode material prepared by the method, the mesoporous strength is improved, the expansion coefficient is reduced, the cycle retention rate of the battery is improved, and the service life of the battery is prolonged. # imgabs0 #

The invention discloses a self-lubricating aluminum coating and a preparation method thereof.The preparation method comprises the steps that molybdenum disulfide is pretreated through a silane coupling agent, tetraethoxysilane mixed liquor is added, the pH is adjusted to be 9-10, a water bath reaction is conducted, and molybdenum disulfide-silicon dioxide microcapsules are obtained after high-temperature strengthening treatment; respectively adding a zinc nitrate solution and a hexamethylenetetramine solution, adjusting the pH value to 10-11, carrying out a high-temperature and high-pressure hydrothermal reaction to obtain zinc oxide nanorods, and carrying out ball milling treatment on the zinc oxide nanorods, microcapsules, stearic acid and zirconium oxide balls under the protection of argon to obtain doped microcapsules; after raw materials are pretreated, the raw materials and a dispersing agent solution are added into a mixer respectively, spraying powder, a pretreated base body and the spraying powder are obtained after mixing treatment, spraying treatment is conducted on the surface of the base body through a plasma spraying method, and the self-lubricating aluminum coating is obtained after vacuum annealing treatment. Therefore, the obtained self-lubricating aluminum coating is low in friction coefficient, high in performance and excellent in self-lubricating property.

The invention provides a lithium metal negative electrode current collector, a preparation method thereof and a lithium metal battery, and the method comprises the following steps: carrying out single-side treatment on carbon cloth in oxygen plasma for 8-12 seconds to obtain gradient activated carbon cloth; the preparation method comprises the following steps: dissolving Zn (NO3) 2 and urotropine in water, and slowly adding ammonia water to obtain a colorless and transparent precursor solution; and transferring the precursor solution into a polytetrafluoroethylene liner, carrying out hydrothermal reaction on the precursor solution and gradient activated carbon cloth, cooling to room temperature, and washing and drying to obtain the lithium metal negative electrode current collector. The three-dimensional carbon cloth current collector with longitudinal zinc oxide gradient distribution is obtained through single-sided oxygen plasma treatment and a one-step hydrothermal method, and meanwhile, lithium is induced to deposit from bottom to top and uniformly grow in a three-dimensional carbon cloth framework with ZnO lithium-loving sites gradient distribution by effectively controlling the concentration distribution of ZnO, so that the formation of lithium dendrites is inhibited; the cycle stability of the electrode is improved, and long cycle stability and high energy density of the lithium battery are realized.

The invention discloses a preparation method of a carbon fiber cloth coated SixFe1-xO2 nanorod material, which comprises the following steps: dissolving a silicon source and an iron source in a mixed solution of ethanol and ethylene glycol, adding hexamethylenetetramine and urea step by step, stirring and dissolving to obtain a mixed solution, then putting the mixed solution and carbon fiber cloth into a high-pressure reaction kettle together, and stirring for 30-60 minutes to obtain the carbon fiber cloth coated SixFe1-xO2 nanorod material. The preparation method comprises the following steps: adding a carbon fiber cloth coated SixFe1-x (OH) 4 nanorod material into a reaction kettle, reacting at a certain temperature in a constant-temperature drying box, then naturally cooling to room temperature, washing and drying to obtain the carbon fiber cloth coated SixFe1-x (OH) 4 nanorod material, putting the carbon fiber cloth coated SixFe1-x (OH) 4 nanorod material into a muffle furnace, and annealing in an air environment to obtain the carbon fiber cloth coated SixFe1 The synthesis process is simple, the cost is low, the requirement for equipment is low, the controllable degree is high, and the obtained product is uniform and novel in morphology, has high charging and discharging capacity and long cycle life as a flexible negative electrode material, and has wide application in the fields of flexible batteries, photoelectric devices and the like.

The invention provides a NiS < x > / MoS2 composite material, a preparation method and application, and relates to the technical field of electromagnetic microwave materials, a Ni-Mo precursor nanosheet prepared from a molybdenum source and a nickel source is self-assembled to form 3D nano flower balls, the 3D nano flower balls and a sulfur source are subjected to a vulcanization reaction to prepare the NiS < x > / MoS2 composite material, and the NiS < x > / MoS2 composite material is a NiS / MoS2 composite material or a NiS / NiS < 2 > / MoS2 composite material; the preparation method comprises the following steps: S1, dissolving a molybdenum source, a nickel source and hexamethylenetetramine in water, and fully stirring to obtain a uniform solution; s2, the solution is subjected to a hydrothermal reaction, precipitates are taken out and subjected to washing and drying treatment, and a Ni-Mo precursor is prepared; and S3, the Ni-Mo precursor and a sulfur source are subjected to annealing treatment, and the NiS < x > / MoS2 composite material is prepared. In the vulcanization process, along with heterogeneous forming, violent movement of surface charges, a strong polarization effect caused by multiple heterogeneous interfaces, sulfur vacancies and other defects, the polarization loss capacity of the NiSx / MoS2 composite material is remarkably improved, the NiSx / MoS2 composite material is applied to the field of electromagnetic wave absorption, multiple reflection and scattering of electromagnetic waves are facilitated, and the electromagnetic wave absorption efficiency is improved.

The invention discloses a resourceful treatment method for mother liquor in a glycine production process. The method comprises the following steps: introducing hydrogen chloride gas into mother liquor in a glycine production process to obtain hydrolysate; centrifugally separating the hydrolysate to obtain an ammonium chloride product, and treating the primary centrifugal filtrate in the next process; adding urea into the centrifugal filtrate for reaction, and after the reaction is completed, carrying out centrifugal separation to obtain a solid product urea-formaldehyde resin and a secondary centrifugal filtrate; the secondary centrifugal filtrate is heated, methyl alcohol in the filtrate is removed, methyl chloride is recycled, then heating continues, water in the filtrate is removed, evaporation condensate water is obtained, methyl chloride can be collected to serve as a by-product to be sold, the evaporation condensate water is reused for glycine production, and evaporation residual liquid serves as organic matter fertilizer to be treated. Under the condition of low energy consumption, impurities such as urotropin, ammonium chloride and methanol ammonia in the glycine mother liquor are separated, and resources such as urotropin, ammonium chloride and methanol in the mother liquor are recycled.

The invention discloses a catalyst carrier and a preparation method and application thereof, and belongs to the technical field of catalyst carriers, the preparation method comprises the following steps: mixing alumina sol with a composite template agent, tin chloride and silica sol to obtain slurry; preparing carrier wet balls from the slurry, drying and roasting to obtain the catalyst carrier; the composite template agent comprises a surfactant and organic amine, the surfactant is a zwitterionic surfactant and a nonionic surfactant, and the organic amine is hexamethylenetetramine; the mass ratio of the surfactant to the organic amine is 1: (10-20); the mass ratio of the zwitterionic surfactant to the nonionic surfactant is 1: (1-2). According to the invention, the crushing strength reaches 71N / particle to 80N / particle, the specific surface area reaches 138 m < 2 > / g to 165 m < 2 > / g, the performance of the alumina catalytic carrier is greatly improved, and technical support is provided for long-term efficient and stable operation of a catalyst.

The method comprises the following steps: adding a carbon source and a formaldehyde solution into a container, then adding a proper amount of urotropine and sodium hydroxide, heating and continuously stirring to fully dissolve the urotropine and sodium hydroxide, raising the temperature after dissolving, carrying out heat preservation and prepolymerization for a period of time, adding a proper amount of solvent and polyacrylic acid after prepolymerization, and uniformly stirring, thereby obtaining the carbon aerogel microspheres. A precursor solution is obtained; performing spray drying on the precursor solution to complete granulation to obtain organic microspheres; carrying out heat preservation and aging on the organic microspheres for a period of time to further carry out cross-linking reaction; and carrying out high-temperature carbonization on the aged organic microspheres in an inert gas atmosphere and high-temperature activation in a carbon dioxide gas atmosphere by using a fluidized bed to obtain the monodispersed carbon aerogel microspheres. The method is low in production cost and short in preparation period, the particle size of the carbon aerogel microspheres can be effectively regulated and controlled, and the performance of the carbon aerogel microspheres applied to the fields of catalysis, electrochemistry and the like can be effectively improved.

The invention discloses a CO2 oil displacement channeling sealing and in-situ curing integrated system and a preparation method thereof, and belongs to the technical field of oilfield chemistry. The system is prepared from the following raw material components in percentage by weight: 0.05%-0.10% of a foaming agent, 0.1%-0.5% of a foaming synergist, 0.1%-0.8% of a stabilizer, 0.15%-0.30% of a first-order curing agent A, 0.25%-0.35% of a first-order curing agent B, 1.0%-2.0% of a second-order curing agent and the balance of water. The first-order curing agent A is resorcinol or hydroquinone; the first-order curing agent B is urotropine; the second-order curing agent is a choline chloride deep eutectic solvent. According to the CO2 oil displacement channeling sealing and in-situ curing integrated system, a unique second-order curing mechanism is adopted, CO2 channeling is inhibited, meanwhile, foam gel is formed through crosslinking of a stabilizer and a first-order curing agent, first-order curing is achieved, then under the ion exchange action of the second-order curing agent, calcium carbonate microcrystal formation is promoted, the mineralization channeling sealing rate is increased, and the CO2 oil displacement channeling sealing and in-situ curing integrated system is obtained. And forming a final cured product.

The invention discloses a disc brake pad friction material and a preparation process thereof, and relates to the technical field of brake pads. The friction material is prepared from the following raw materials in parts by weight: 10 to 14 parts of phenolic resin, 10 to 12 parts of modified nitrile rubber, 1.5 to 2.5 parts of hexamethylenetetramine, 1 to 2 parts of calcium stearate, 0.5 to 1 part of magnesium oxide, 0.3 to 0.5 part of aluminum oxide, 2 to 4 parts of self-healing microcapsules, 5 to 7 parts of diatomite, 20 to 24g of barium sulfate, 21 to 25 parts of kaolin, 10 to 12 parts of calcium carbonate and 5 to 7 parts of graphite. The synthesized modified nitrile rubber is obtained by introducing a POSS structure, hydroxyl and hindered phenol into nitrile rubber, and the synthesized self-healing microcapsule is obtained by introducing dehydroabietic acid and a polysiloxane chain into the wall material of the microcapsule, namely the surface of urea-formaldehyde resin. The friction material is high in oxidation resistance, high temperature resistance, water resistance and self-healing capacity and has stable tribological performance.

The invention discloses a reagent combination, an analyzer and a detection method for detecting beryllium element content in a water sample. The reagent combination is composed of a color developing agent, a masking agent, a buffer solution and a catalytic solution. The color developing agent comprises chrome cyanine R; the masking agent comprises EDTA (Ethylene Diamine Tetraacetic Acid), ascorbic acid, tartaric acid and ethylene glycol amine; the buffer solution comprises ammonium acetate and hydrochloric acid; the catalytic liquid comprises hexadecylpyridinium chloride. Compared with a standard method, the adopted reagents have the advantages that the reaction steps are simplified, the stability of the reagents is better, the shelf life is longer, the reagents such as ammonia water and hexamethylenetetramine used in the standard method not only have pungent smell and larger environmental pollution, but also are easy to volatilize and deteriorate, and are not beneficial to long-term storage, so that the long-term measurement result is deviated, and the accuracy of the detection result is improved. Reagents used in the method do not have the defects, and can be stored for a long time at normal temperature, so that the method can be suitable for unattended automatic instruments and automatic water quality monitoring stations.

The invention discloses a preparation method of a low-expansion silicon-carbon negative electrode material, which comprises the following steps: (S1) uniformly mixing an aldehyde monomer, a phenol monomer, hexamethylenetetramine and aluminum oxide, heating and polymerizing to obtain thermosetting phenolic resin, and calcining at high temperature to obtain high-strength carbon; (S2) performing physical activation on the high-strength carbon to obtain high-strength porous carbon; and (S3) by taking the high-strength porous carbon as a substrate, sequentially carrying out silicon deposition and carbon coating to prepare the low-expansion silicon-carbon negative electrode material. The porous carbon prepared by a specific method has high strength, high conductivity and an excellent pore structure, and the silicon-carbon negative electrode material prepared by taking the porous carbon as the substrate has high cycle stability and low expansion rate.

The invention discloses a water injection well depressurization and augmented injection agent and a preparation method thereof, and relates to the technical field of augmented injection agent materials. The pressure-reducing and injection-increasing agent for the water injection well comprises the following raw materials in parts by weight: 50-60 parts of a betaine type ampholytic surfactant, 10-15 parts of a nonionic surfactant, 20-30 parts of a quaternary ammonium salt surfactant, 3-5 parts of a scale inhibitor, 2-3 parts of a stabilizer and 150 parts of deionized water. The preparation method comprises the following steps: preparing a first-generation polymer from urotropine and tromethamine, then reacting the first-generation polymer with epoxy chloropropane to prepare a graft polymer, and finally reacting the graft polymer with hexadecyl dimethyl tertiary amine to prepare the quaternary ammonium salt surfactant. The water injection well depressurization and augmented injection agent prepared by the invention has the characteristics of large unblocking radius, good depressurization and augmented injection effects and the like.

The invention provides a phosphorus-doped nitrogen-rich porous carbon nanosheet for regulating nitrogen activity as well as a preparation method and application of the phosphorus-doped nitrogen-rich porous carbon nanosheet, and belongs to the technical field of preparation of negative electrode materials. The preparation method of the phosphorus-doped nitrogen-rich porous carbon nanosheet for regulating and controlling the nitrogen activity comprises the following steps: adding a metal source solution into an amine compound solution, stirring to obtain a precipitate, washing and drying to obtain a nanosheet precursor, then heating in an inert gas atmosphere, preserving heat to obtain a two-dimensional N / C nanosheet, and finally phosphating the two-dimensional N / C nanosheet, the amine compound comprises hexamethylenetetramine. The phosphorus-doped nitrogen-rich porous carbon nanosheet for regulating and controlling the nitrogen activity has relatively large interlayer spacing and rich pore defects and edge sites, can adsorb more Na < + >, can effectively reduce the diffusion distance of Na < + >, and has excellent conductivity as a negative electrode material.

The invention discloses easy-to-scatter and easy-to-regenerate precoated sand and a preparation method thereof, and belongs to the technical field of precoated sand preparation, and the easy-to-scatter and easy-to-regenerate precoated sand comprises the following components in parts by weight: 1000 parts of steel shots, 7-10 parts of phenolic resin, 2.9-4.5 parts of urotropine aqueous solution and 4.9-7.5 parts of calcium stearate. The cast aluminum precoated sand and the preparation method thereof have the beneficial effects that the cast aluminum precoated sand is prepared by adopting the steel shot with the angular coefficient closer to 1, good flowability, good thermal conductivity and low cost as the crude sand, and the problems that in the prior art, the cast aluminum precoated sand is high in production cost, and a resin coating is uneven in distribution are solved.

The invention provides a bifunctional self-supporting electrode composite material and a preparation method and application thereof.The preparation method comprises the steps that NiMoOx nanowires growing on foamed nickel are added into a mixed solution containing a nickel source, a cobalt source, an iron source and hexamethylenetetramine, hydrothermal reaction is conducted, and a precursor is obtained; and then pyrolyzing in a hydrogen and argon mixed atmosphere to obtain the difunctional self-supporting electrode composite material. Compared with the prior art, hexamethylenetetramine is used for in-situ synthesis of NiCoFe-MoNi4 / MoO2 / NF on the surface of the NiMoOx nanowire at a low temperature, and the NiCoFe-MoNi4 / MoO2 / NF is used as an effective difunctional electrocatalyst for complete water splitting. According to the invention, a strong synergistic effect is generated between the ternary NiCoFe compound and MoNi4 / MoO2, so that the intrinsic activity of the catalyst is improved. The catalyst simultaneously serves as a cathode and an anode to participate in catalytic reaction, and the performance of the catalyst exceeds the catalytic performance of commercially available noble metal electrodes.

The utility model relates to the technical field of urotropine production, in particular to a circulating ammonia gas recovery device for urotropine production, which comprises a spray tower, a first spray component and a first flow guide cover, a first recovery pool is fixed at the lower part in the spray tower, and a gas inlet component is arranged on one side of the first recovery pool; a first spraying assembly is mounted on the upper edge of the outer part of the first recycling pool; the device has the beneficial effects that the first spraying assembly and the second spraying assembly facilitate secondary spraying of ammonia-containing gas in the urotropine production process, the sprayed ammonia-containing water flow can be circularly sprayed and utilized, the sprayed gas can make contact with the inner wall of the first flow guide cover of the inverted-funnel-shaped structure in the rising process, and the ammonia-containing water flow can be recycled. And in the same way, the second flow guide cover can be used for recollecting the ammonia-containing water vapor in the gas subjected to secondary spraying, so that the condition that ammonia gas in the ammonia-containing water vapor is inconvenient to recycle is avoided.

The invention discloses a high-strength ecological environment-friendly water permeable brick and a preparation method thereof, and relates to the technical field of water permeable bricks. The ecological environment-friendly water permeable brick is prepared from the following raw materials in parts by weight: 80 to 100 parts of quartz sand, 10 to 15 parts of cement, 30 to 50 parts of deionized water, 10 to 12 parts of filler, 2 to 5 parts of defoaming agent and 5 to 10 parts of adhesive. The preparation method comprises the following steps: carrying out a reaction on urotropine and tromethamine to prepare a first-generation polymer, then carrying out a reaction on the first-generation polymer and isocyanate-2-chloro-6-methyl phenyl ester to prepare an intermediate 1, and then carrying out a reaction on the intermediate 1 and bisphenol A epoxy resin to prepare an intermediate 2; finally, gamma-aminopropyl triethoxy silane is grafted to the intermediate 2, and the adhesive is prepared. The prepared ecological environment-friendly water permeable brick has good mechanical strength, water permeability and wear resistance.