33 results about "Sodium Hypophosphite Monohydrate" patented technology

The application discloses a P and O co-doped FeNiRuOx nano catalyst and a preparation method and application thereof, relates to the technical field of electrocatalytic materials, and the catalyst takes Fe, Ni and Ru as metal active centers, reconstructs a surface electronic structure through P and O double anion co-doping, and forms a polygonal nano structure, wherein the mass fraction ranges of Fe, Ni, Ru and P are 5.0-6.0%, 75-78%, 11-12% and 6.5-7.0% respectively. The preparation method comprises the following steps: taking iron acetylacetone, nickel acetylacetone and ruthenium chloride trihydrate as metal sources, synthesizing a precursor through a solvothermal reaction, and realizing P and O co-doping through a sodium hypophosphite assisted solid-phase phosphorization process, and the preparation process is mild. The synthesized catalyst has unique structural advantages, the formed polygonal nano structure has a large specific surface area and rich grain boundary defects, more active sites are exposed, and convenient channels are provided for the mass transfer of reactants and products. The synergistic effect among the polymetals further enhances the catalytic performance.

The application discloses a kind of synthesis methods of high-purity electronic grade sodium hypophosphite, dilute phosphine gas is passed into to the mixed solution of sodium hypochlorite and sodium hydroxide that has been pre-cooled with sufficient stirring, and sodium hydroxide is added to carry out reaction;After reaction is completed, filtration, concentration, crystallization, separation are carried out, and the obtained product is purified by resin to obtain high-purity electronic grade sodium hypophosphite product.Compared with the traditional "yellow phosphorus-lime-soda" oxidation-reduction method for preparing industrial grade product and then preparing high-purity electronic grade sodium hypophosphite, the product purification difficulty of the application is low, by using 7N grade ultra-high purity phosphine without any metal impurities, the problem that arsenic, silicon, germanium, nickel, chromium and other metal impurities cannot be completely removed by traditional process can be effectively solved.In addition, the application also has the advantages of effectively solving the problem of three wastes, high recycling rate of by-products, high economy and the like.

The application discloses a preparation method of multifunctional composite nanometer hollow spheres, which comprises the following steps: dissolving iron cyanide in water to form solution A; dissolving cobalt salt, silver salt and sodium citrate in water to form solution B; adding solution B into solution A and stirring for 10-30 min, and then aging for 24-48 h to obtain a precursor; and heat-treating the prepared precursor in a tubular furnace under N2 atmosphere at 600-900 DEG C for 2-5 h, and the heating rate is 1-3 DEG C / min, and then continuing phosphorization treatment for 1-5 h at 300-400 DEG C by taking sodium hypophosphite as a phosphorus source to obtain multifunctional composite nanometer hollow sphere catalysts. The preparation method is simple and easy to operate, the prepared composite catalyst is composed of multiple components, has multifunctionality, and shows excellent catalytic activity on electrocatalytic hydrogen evolution, oxygen evolution and oxygen reduction reaction in an alkaline medium, and shows a good application prospect in electrocatalytic water decomposition and zinc-air batteries.

This invention discloses a temperature-controlled sustained-release amino acid chitosan drug carrier, its preparation method, and its application, belonging to the field of biomedical materials technology. The preparation method includes the following steps: dissolving chitosan in a first organic acid solution to obtain a chitosan solution; adding butanetetracarboxylic acid and sodium hypophosphite to the chitosan solution, adjusting the solution to a set pH value, and reacting to obtain a reaction solution; precipitating the reaction solution with ethanol, then filtering, washing with deionized water until neutral, and vacuum drying to obtain modified chitosan; dispersing the modified chitosan in deionized water, adding amino acids, adjusting the pH to acidic, adding a crosslinking agent, and stirring the reaction at room temperature to obtain a crosslinking reaction solution; sequentially dialyzing and freeze-drying the crosslinking reaction solution to obtain a complex; mixing the complex with water to prepare an aqueous solution, pouring it into a polytetrafluoroethylene mold for room temperature drying to form a nascent film; immersing the nascent film in a second organic acid solution, then sequentially rinsing with deionized water overnight, and air-drying at room temperature to obtain the temperature-controlled sustained-release amino acid chitosan drug carrier. This is used to solve technical problems such as poor mechanical properties of chitosan and uncontrollable load release mechanism.

This invention discloses a molybdenum phosphide quantum dot-embedded polyaniline-derived hollow sphere hard carbon composite material and its preparation method. The preparation method includes the following steps: (1) preparing polyaniline hollow spheres using aniline, hydrogen peroxide, anhydrous ferric chloride, and phosphoric acid aqueous solution as raw materials via a hydrothermal method; (2) immersing the polyaniline hollow spheres in concentrated hydrochloric acid, drying them, and then performing a secondary hydrothermal treatment with ammonium molybdate tetrahydrate and ammonium dihydrogen phosphate to obtain a precursor; (3) further carbonizing and phosphating the precursor with sodium hypophosphite monohydrate to obtain the molybdenum phosphide quantum dot-embedded polyaniline-derived hollow sphere hard carbon composite material. In this composite material, molybdenum phosphide is embedded in the hard carbon wall of polyaniline hollow spheres with a diameter of 200-300 nm in the form of 2-3 nm quantum dots, accounting for approximately 20-25 wt% by mass. The composite material provided by this invention can be used as an electrode material, and the potassium-ion batteries prepared from it have high specific capacity, good cycle stability, and excellent rate performance. Furthermore, the method provided by this invention has the advantages of simple process, low cost, and large-scale production capability.

This invention provides a method for recovering silver from waste silver plating solution, belonging to the field of heavy metal industrial wastewater treatment technology. The invention involves adding sodium hypophosphite to waste silver plating solution containing complexed silver. After the sodium hypophosphite dissolves, the pH of the system is adjusted to alkaline. A reduction reaction is then carried out under heating conditions to generate elemental silver particles. This invention utilizes the in-situ generation of hydrogen free radicals from sodium hypophosphite under alkaline heating conditions to achieve direct reduction and complex breaking of stable silver nicotinic acid complexes and elemental silver conversion. This process is completed in one step, simplifying the traditional complex multi-step process of "oxidation-complex breaking-ion release-chemical precipitation" into a single reduction step, significantly shortening the treatment process and improving the reaction rate and treatment efficiency.

This invention proposes a boron-phosphorus co-doped multi-element alloy catalyst supported on a metal oxide substrate, its preparation method, and its application. It belongs to the technical field of sodium borohydride hydrolysis hydrogen production materials. The method involves loading cobalt salts (such as cobalt chloride or cobalt nitrate), iron salts (such as ferric chloride or ferric nitrate), and hypophosphite (such as sodium hypophosphite) onto a support (such as γ-alumina or titanium dioxide) using an initial wet impregnation method. Sodium borohydride solution is added for chemical reduction, and boron is added for doping. After washing the reduction product, the catalyst is dried to obtain the supported boron-phosphorus co-doped multi-element alloy catalyst. When used as a sodium borohydride hydrolysis hydrogen production catalyst, it provides a maximum hydrogen production rate of 12729.78 mL·g under optimal conditions. cat ‑1 ·min ‑1 It produces 100% of the theoretical hydrogen yield and features good catalytic performance, simple preparation method, abundant raw materials, and low cost.

The application discloses a kind of integrated circuit chip package lead frame's electroless gold plating solution and its gold plating method, it is related to integrated circuit chip packaging field.Therein, electroless gold plating solution is following concentration component aqueous solution: water-soluble gold compound, with Au, concentration is 1-1.5g / L;Sodium hypophosphite 10~20g / L;Malic acid 15~20g / L;Citric acid 15~20g / L;N,N'-bis (2-hydroxyethyl) ethylenediamine 10~15g / L;Triammonium citrate 15~20g / L;EDTA-2Na 5~10g / L;5,5'-dimethyl hydantoin 5~10g / L;Metal ion catalyst, with metal ion, concentration is 2~3ppm;Mercaptoimidazole 0.01~0.015g / L;Hexamethylenetetramine 5~10g / L.The electroless gold plating solution in the application can consider stability, high deposition rate and plating layer deposition uniformity.

The application discloses a device for preparing electronic-grade sodium hypophosphite dearsenicated salt sodium salt, and belongs to the technical field of electronic chemical preparation. The device realizes the efficient dispersion of phosphine gas into micron-sized bubbles through a membrane dispersion reaction system, realizes the full and stable reaction of the phosphine gas with sodium hypochlorite solution, guarantees the high efficiency and uniformity of the main synthesis reaction from the source, and provides a composition-stable crude product liquid for subsequent continuous purification. Through a bypass arsenic removal unit integrated in a buffer adjustment system, the on-line circulation oxidation-precipitation-separation of arsenic impurities is realized without interrupting the main synthesis process, and the problem of the interruption of the synthesis route caused by the intermittent arsenic removal in the traditional process is solved. By arranging yellow phosphorus storage tanks in parallel and alternately working, the continuous and stable supply of the raw material yellow phosphorus to the phosphine reaction kettle is realized. The device ensures the long-term continuous and stable operation of the synthesis route and the high consistency of product batches, and is particularly suitable for the large-scale continuous production of electronic-grade sodium hypophosphite.

The application provides a preparation method of a bifunctional electrolysis water nitrogen-phosphorus doped high-entropy catalyst, and belongs to the technical field of hydrogen production by electrolysis of water. The method first pretreats a metal substrate, then adsorbs a five-metal precursor solution containing nickel, molybdenum, cobalt, zirconium and iron by immersion, and rapidly constructs a high-entropy oxide structure by using instantaneous Joule heat technology. The core innovation is to use the reducing atmosphere generated by the in-situ decomposition of ammonium hypophosphite and sodium hypophosphite in the Joule heat process to realize the synchronous nitrogen-phosphorus modification of the material surface, which shortens the time-consuming of the traditional process from several hours to seconds and significantly reduces the energy consumption. The finally prepared catalyst has excellent hydrogen evolution (HER) and oxygen evolution (OER) bifunctional activity and chemical stability: the OER overpotential is less than 230 mV, and the HER overpotential is less than 50 mV at a current density of 10 mA·cm ‑2 The electrolysis voltage remains stable in fluctuation electrolysis test, start-stop test and constant current electrolysis, and has excellent stability.

This invention discloses a "vacancy-twin" composite structure catalyst for hydrazine oxidation and its preparation method. The method comprises the following steps: S1: Dissolving nickel salt, zinc salt, and copper salt in deionized water, adding urea and ammonium fluoride, and stirring until homogeneous to obtain a mixed solution. The mixed solution and nickel foam are then transferred to a reactor for hydrothermal reaction to obtain Ni(OH)₂-Zn(OH)₂-Cu(OH)₂ / NF foam; S2: Reducing the Ni(OH)₂-Zn(OH)₂-Cu(OH)₂ / NF foam using a sodium hypophosphite-sodium borohydride reducing solution; S3: Further reduction and annealing are performed in a mixed atmosphere of argon and hydrogen, followed by cooling to obtain the "vacancy-twin" composite structure NiZnCu catalyst. This catalyst, containing a twin structure with vacancy defects, exhibits a synergistic catalytic effect, enhancing the catalytic performance of the NiZnCu alloy.

The application relates to the field of mine filling, in particular to preparation and application of carbon-mineralized phosphogypsum mine filling material, which is prepared from the following raw materials in parts by mass: 70-100 parts of red mud, 20-40 parts of yellow phosphorus slag, 1-10 parts of fly ash, 1-10 parts of slag, 5-20 parts of compound activator, 4-8 parts of modified cellulose, 10-30 parts of activated phosphogypsum, 8-16 parts of fine aggregate, 3-8 parts of modified biochar, 1-5 parts of water reducing agent and 50-100 parts of water; the modified cellulose is prepared from AlCl3, sodium hypophosphite, 1,4-butanediol diglycidyl ether and butane tetracarboxylic acid. In the high-alkaline environment, P and F are simultaneously and efficiently solidified, the fine aggregate cementing material is mixed into filling slurry, CO2 is introduced, free calcium oxide in the steel slag and calcium carbide slag is reacted with the calcium sulfate hemihydrate in the phosphogypsum to form calcium carbonate, the strength of the filling body is rapidly improved, and the solidification of CO2 is completed.

The application belongs to the technical field of composite materials, and discloses a preparation method of nickel-coated graphene and application of the nickel-coated graphene in aluminum-based composite materials. The preparation method comprises the following steps: obtaining graphene nanosheets by pretreating natural graphite; forming a nickel catalytic seed layer through stannous chloride sensitization and sodium borohydride activation; and performing chemical plating in a plating solution containing nickel sulfate hexahydrate, sodium citrate, ammonium chloride and sodium hypophosphite monohydrate to obtain nickel-coated graphene with a 3-10 nm continuous nickel shell layer on the surface. The nickel-coated graphene is mixed with aluminum-silicon-magnesium alloy powder and ball milled, and then subjected to low-temperature reaction at 350-450 DEG C to generate Al3Ni phase, high-temperature hot pressing densification at 600-650 DEG C to obtain aluminum-based composite materials. The method can effectively control Al-C interface reaction, inhibit the generation of Al4C3, improve the mechanical properties and electrical conductivity of the composite materials, and is suitable for large-scale application.

The application discloses a bifunctional electrocatalyst of N and P co-doped porous carbon nanosheet loaded FeCo hollow nanospheres and a preparation method and application thereof. The preparation method is as follows: nitrogen-doped carbon materials are prepared through grinding and mixing and high-temperature pyrolysis. Pluronic F-127, the nitrogen-doped carbon materials, iron nitrate, cobalt nitrate, melamine and o-phenylenediamine are added into an ethanol solution to be mixed, ultrasonically treated and stirred, and after reaction, the solution is evaporated, high-temperature pyrolysis and sodium hypophosphite phosphorization are carried out, and finally the bifunctional electrocatalyst of N and P co-doped porous carbon nanosheet loaded FeCo hollow nanospheres is obtained. The catalyst can exhibit excellent catalytic activity in electrocatalytic oxygen reduction reaction and oxygen evolution reaction, and can be applied in a liquid zinc-air battery.

The application relates to the technical field of water filtering agents, and provides a papermaking pulp water filtering agent and a preparation method and application thereof, raw materials of the papermaking pulp water filtering agent are prepared in weight parts, and the raw materials include 30-45 parts of acrylamide, 8-14 parts of active hydroxyl crosslinking monomers, 6-10 parts of methacryloyloxyethyl trimethyl ammonium chloride, 4-8 parts of N-vinyl pyrrolidone, 0.2-0.5 parts of ammonium persulfate, 0.1-0.4 parts of sodium bisulfite, 4-6 parts of glyoxal aqueous solution, 0.5-1.5 parts of a buffer stabilizer, 0.5-1.1 parts of sodium hypophosphite, 1.5-4.5 parts of core-shell structure polydopamine coated silica microspheres, 2-5 parts of benzene boronic acid functionalized oxidized glucomannan and 50-70 parts of deionized water. The components in the application have a synergistic effect, so that the prepared papermaking pulp water filtering agent can improve the pulp water filtering efficiency and guarantee the stability of the physical strength of paper.

The application discloses a preparation method of a nickel-iron bimetallic multi-component composite porous fiber material, which comprises the following steps: dissolving phenylenediamine Schiff base, polyacrylonitrile, iron salt and nickel salt in N,N-dimethylformamide to form a transparent solution, and then electrospinning the solution under a voltage of 16kV to obtain a precursor fiber; and the prepared precursor fiber is first treated in a tubular furnace under N2 atmosphere, heated to 700-900 DEG C and treated for 2-6h to obtain a carbonized fiber; and the carbonized fiber is treated in the tubular furnace with sodium hypophosphite as a phosphorus source, heated to 350 DEG C and treated for 4-8h to obtain the nickel-iron bimetallic multi-component composite porous fiber material. The phenylenediamine Schiff base is used as a ligand and main carbon source and nitrogen source, the polyacrylonitrile is used as an auxiliary carbon source and nitrogen source, and the sodium hypophosphite is used as a phosphorus source, so that the operation is simple and the cost is low. The composite material has excellent catalytic activity and good stability for electrocatalytic hydrogen evolution, oxygen evolution and hydrogen production by water electrolysis under alkaline conditions, and has a good application prospect in the hydrogen production by water electrolysis technology.

The application provides a scale inhibitor and a preparation method and application thereof. The preparation method of the scale inhibitor comprises the following steps: mixing inulin, alkali and water to obtain an alkali solution of inulin; mixing N-hydroxyethyl acrylamide, isopropyl alcohol and water to obtain an isopropyl alcohol aqueous solution of N-hydroxyethyl acrylamide; mixing itaconic acid, sodium hypophosphite, alkali and water to obtain a mixed alkali solution of itaconic acid and sodium hypophosphite; adding a redox initiator into the alkali solution of inulin, and then performing a first reaction under a deoxygenated atmosphere to obtain an activated alkali solution of inulin; mixing the activated alkali solution of inulin with the isopropyl alcohol aqueous solution of N-hydroxyethyl acrylamide and the mixed alkali solution of itaconic acid and sodium hypophosphite, and then performing a second reaction under a deoxygenated atmosphere to obtain a copolymer solution; and performing purification treatment on the copolymer in the copolymer solution, so that the obtained copolymer is the scale inhibitor.

The application belongs to the technical field of flame retardant preparation, and particularly relates to a preparation method of aluminum diethylphosphinate. The application is prepared by taking sodium hypophosphite and ethylene as reaction raw materials, water as a solvent, adding an initiator and a Lewis acid catalyst, and synergistically catalyzing the addition reaction of sodium hypophosphite and ethylene to synthesize sodium diethylphosphinate, and then reacting the sodium diethylphosphinate with an aluminum salt to generate aluminum diethylphosphinate. The method has the advantages of simple operation, short reaction time, high yield of aluminum diethylphosphinate, high product purity, and small corrosion to equipment, and is a very promising preparation method for industrial application.

The application discloses a kind of chemical plating black nickel concentrated solution, including concentrated solution A, concentrated solution B and concentrated solution C, concentrated solution A includes nickel sulfate, stannous sulfate, zinc sulfate, sodium hypophosphite, sodium citrate, sodium acetate, sodium lactate, sulfur-containing amino acid, stabilizer, ammonia and deionized water, concentrated solution B includes sodium hypophosphite, zinc sulfate, sodium acetate, sodium lactate, stabilizer and deionized water, concentrated solution C includes nickel sulfate, stannous sulfate, sodium citrate, sulfur-containing amino acid, ammonia and deionized water.The application also discloses its preparation method, plating method and application.The black nickel layer prepared from the chemical plating black nickel concentrated solution of the application not only has excellent blackening effect and luster, but also has excellent wear resistance, corrosion resistance and bonding force when directly contacting with metal substrate.The chemical plating bath has long service life and self-regulating control of pH value by continuous supplementing, and the plating speed is stable during the whole plating process.

This invention belongs to the field of dyeing and printing auxiliaries technology, specifically relating to a quaternary ammonium salt-based polyamide polyether hydrophilic finishing agent, its preparation method, and its application. The preparation method of the quaternary ammonium salt-based polyamide polyether hydrophilic finishing agent of this invention includes the following steps: 1) preparing bi-carboxyl-terminated polyethylene glycol using succinic anhydride and polyethylene glycol; 2) adding adipic acid, hexamethylenediamine, and sodium hypophosphite as a catalyst to the bi-carboxyl-terminated polyethylene glycol, and carrying out a polycondensation reaction at elevated temperature; 3) preparing the quaternary ammonium salt-based polyamide polyether hydrophilic finishing agent using the reaction product obtained in step 2). This invention also provides the application of the quaternary ammonium salt-based polyamide polyether hydrophilic finishing agent in the fabric finishing process. The finishing agent of this invention can improve the hydrophilicity of nylon fiber fabrics.

This application belongs to the field of chemical synthesis technology and discloses polyetheretherketone and its preparation method. The preparation method includes: under a protective atmosphere, reacting hydroquinone and a salt-forming agent in a composite antioxidant system to obtain a first mixture containing hydroquinone salt; reacting the first mixture with 4,4'-difluorobenzophenone to obtain a second mixture; adding a capping agent to the second mixture to carry out a capping reaction to obtain polyetheretherketone; wherein the composite antioxidant system includes diphenyl sulfone, sodium lignosulfonate, sodium metabisulfite, and sodium hypophosphite. This preparation method has few side reactions, high yield, and the prepared polyetheretherketone exhibits excellent properties.

The application relates to a preparation method of organic amine / phosphorus co-doped manganese dioxide, and belongs to the technical field of material preparation and electrochemical energy storage. The method comprises the following steps: firstly, preparing a manganese dioxide precursor by reacting potassium permanganate and sodium thiosulfate; secondly, introducing organic amine for intercalation doping; and finally, carrying out phosphating treatment on the material by decomposing sodium hypophosphite under an inert atmosphere to obtain organic amine / phosphorus co-doped manganese dioxide. Through the synergistic effect of organic amine intercalation and phosphorus doping, the present application effectively expands the interlayer spacing of manganese dioxide, enhances the structural stability, optimizes the electronic structure and ion transmission kinetics. When the obtained material is used as a positive electrode of a water-based zinc ion battery, the material exhibits high specific capacity, excellent rate performance and long cycle life. The method is simple in process, mild in condition, environment-friendly, suitable for large-scale production, and has wide application prospects in the field of energy storage devices.

The application discloses a kind of soil improvement additive based on slag aggregate and preparation process thereof, belong to soil improvement technical field.First, slag aggregate is mixed with phosphoric acid solution, filtrate and solid are collected, to obtain acid-activated slag, then the collected filtrate is mixed with magnesium chloride hexahydrate, aluminium chloride hexahydrate and urea, and the pH is adjusted to obtain a hydrothermal reaction solution;The hydrothermal reaction solution and acid-activated slag are reacted, filtered to obtain slag@LDHs, solvent and cetyltrimethylammonium bromide are added, ammonia water and tetraethyl orthosilicate are added in sequence, and the mixture is stirred to obtain slag@LDHs@SiO2;Deionized water, ferrous sulfate heptahydrate and sodium citrate are mixed, and the pH is adjusted to obtain a plating solution.Finally, slag@LDHs@SiO2, plating solution and sodium hypophosphite are mixed and reacted to obtain a soil improvement additive.The soil improvement additive provided by the application can dynamically neutralize acidic soil, reduce nutrient loss and reduce heavy metal content in crops.

This invention discloses a wrinkle-resistant embroidered fiber fabric. This wrinkle-resistant embroidered fiber fabric is obtained by padding a base fiber fabric with an anti-wrinkle finishing agent. By weight, the raw materials for preparing the anti-wrinkle finishing agent include: 30-40 parts butanetetracarboxylic acid, 6-10 parts diethylene glycol, 30-35 parts sodium hypophosphite, 4-6 parts coumaric acid-veratrol compound fermentation extract, 1.5-2.5 parts fatty acid polyoxyethylene ester, and 60-80 parts deionized water. This invention, by padding a base fiber fabric with an anti-wrinkle finishing agent containing coumaric acid-veratrol compound fermentation extract, obtains a fabric with good wrinkle resistance, antistatic properties, and antioxidant properties.

The application relates to the technical field of textiles, and discloses a fabric with moisture absorption, quick drying and antibacterial functions and a preparation method thereof. The fabric is obtained by impregnating a pure cotton fabric with a finishing working solution. The finishing working solution is obtained by mixing a finishing agent, a citric acid crosslinking agent, sodium hypophosphite, a fatty alcohol polyoxyethylene ether and deionized water. The finishing agent is prepared from hyperbranched polyamide, deionized water, 2,3-epoxypropyl trimethyl ammonium chloride, a cellulose nanowhisker aqueous solution, sorbitan monooleate polyoxyethylene ether and a sodium hydroxide aqueous solution. The hyperbranched polyamide is prepared from anhydrous methanol, ethylenediamine and methyl acrylate. The application has good antibacterial property and quick drying property.

The application relates to the technical field of textile dyeing and finishing, and particularly discloses a CoP / Mn-doped MoS2 heterojunction-based composite carbon nanofiber as well as a preparation method and application thereof. The composite carbon nanofiber is prepared by the following steps: first, preparing flower-like Mn-doped MoS2 by a hydrothermal method; then, forming a shell layer spinning solution by combining the flower-like Mn-doped MoS2 with cobalt salt, sodium hypophosphite, polyacrylonitrile and terephthalic acid, taking carbon fiber as a core layer; and then, forming a core-sheath structure through conjugated electrospinning; and finally, sequentially performing pre-oxidation, phosphorization and high-temperature carbonization treatment to obtain the composite carbon nanofiber. The composite carbon nanofiber has high conductivity, rich catalytic active sites, good mechanical flexibility and structural stability, the core-sheath interface is firmly combined, and the composite carbon nanofiber can realize efficient and stable electrocatalytic reduction of indigo at normal temperature and pressure, and can replace the traditional sodium dithionite reduction process. The flexible fabric electrode prepared based on the fiber can be directly applied to electrocatalytic reduction dyeing of indigo, and has the advantages of simple process, low energy consumption, uniform dyeing and high color fastness.

This invention relates to a high-shield galvanized conduit and its preparation process, belonging to the technical field of galvanized conduit. The galvanized conduit comprises, from the inside out, a base layer, an alloy zinc plating layer, and a shielding layer. The plating solution composition of the alloy zinc plating layer is: 30-50 g / L zinc sulfate heptahydrate, 10-30 g / L sodium citrate, 120-180 g / L potassium pyrophosphate trihydrate, and 20-40 g / L sodium hypophosphite. The shielding layer, by weight, consists of: 80-90 parts water-based epoxy resin emulsion, 20-35 parts modified MXene, 10-15 parts graphene, 1-3 parts silane coupling agent, 15-25 parts curing agent, 0.2-0.8 parts defoamer, 0.5-2 parts leveling agent, and 5-15 parts deionized water. The prepared galvanized conduit exhibits excellent electromagnetic shielding effect and corrosion resistance.

This invention relates to the field of water treatment technology and discloses a water treatment agent for oilfield reinjection water and its preparation method. The invention obtains the water treatment agent for oilfield reinjection water by copolymerizing quinoline modified with sulfonic acid imidazoline quaternary ammonium salt, chitosan modified with Mannich base, acrylic acid, and sodium hypophosphite. Quaternization modification of imidazoline improves its water solubility and corrosion inhibition properties. The quaternary ammonium salt imidazoline can be adsorbed on metal surfaces, reducing the corrosion rate and acting as a surfactant to wet and disperse, accelerating the scale removal rate. The sulfonic acid group improves temperature resistance, prevents gel formation, and its strong hydrophilicity allows the molecular chain to fully extend in water, improving scale inhibition performance. Introducing Mannich base into chitosan improves its acid solubility and temperature resistance. The conjugation effect of the aromatic ring strengthens the coordination chelation effect of chitosan, improving the corrosion inhibition effect. Multiple functional groups exert a synergistic effect, further enhancing the corrosion and scale inhibition effects.