153 results about "Sodium Hypophosphite Monohydrate" patented technology

The invention discloses a wear-resistant vehicle body film and a preparation method thereof, and relates to the technical field of films. The wear-resistant automobile body film prepared by the invention is prepared from polytetrahydrofuran ether glycol, isophorone diisocyanate, a catalyst, dihydric alcohol quaternary ammonium salt, a functional aid, modified silicon dioxide and a chain extender. The dihydric alcohol quaternary ammonium salt is obtained by reacting N, N '-dihexyl-N, N'-dimethyl propane-1, 3-diamine with monochloroacetone and then condensing with glycerol; the functional additive is obtained by reacting 2-boric acid thiophene-4-methyl acetate with 2, 7-dibromofluorene and then carrying out bromination hydrolysis; the modified silicon dioxide is obtained by reacting pretreated silicon dioxide with melamine and then reacting with sodium hypophosphite. The wear-resistant vehicle body film prepared by the invention has good anti-aging, wear-resistant, antibacterial and flame-retardant properties.

The invention provides a treatment process of a byproduct sodium hypophosphite in a phosphorane preparation process, and aims to efficiently remove impurities and prepare a high-purity hypophosphorous acid product. The process comprises the following steps: carrying out small-volume sampling on reaction mother liquor, introducing carbon dioxide gas, and drawing an acidification curve of pH and conductivity; according to the plateau phase of an acidification curve, the CO2 flow rate and the pH value are controlled, step-by-step selective precipitation of impurities such as PO4 < 3->, HPO4 < 2->, Fe < 3 + >, AsO4 < 3-> and S < 2-> is achieved, and loss of a target component H2PO4 < 2-> is avoided; calcium hydroxide turbid liquid is introduced at a proper time to supplement Ca < 2 + > and promote efficient removal of phosphorus, arsenic and sulfur impurities; and subsequently removing excessive Na < + > and Ca < 2 + > through cation exchange, and concentrating to obtain a hypophosphorous acid product with the purity of more than or equal to 99.5%. The method is accurate in process control, thorough in impurity removal and good in repeatability and industrial adaptability, and the resource utilization efficiency of by-products and the added value of products are remarkably improved.

The invention provides a post-added nanocellulose enhancing auxiliary agent for latex paint coating and a preparation method and a use method thereof, and the preparation method comprises the following steps: mixing, stirring and heating butanetetracarboxylic acid, sodium hypophosphite and a nanocellulose solution to obtain an esterified nanocellulose solution; adding a silane coupling agent solution into the esterified nanocellulose solution to obtain a modified nanocellulose solution; dispersing nano silicon dioxide into absolute ethyl alcohol to obtain silicon dioxide dispersion liquid; adding a silane coupling agent solution into the silicon dioxide dispersion liquid, mixing, stirring and heating for reaction to obtain modified silicon dioxide powder; dispersing the modified silicon dioxide powder into absolute ethyl alcohol to obtain modified silicon dioxide dispersion liquid; adding the compound emulsifier solution into the modified silicon dioxide dispersion liquid, and shearing and emulsifying to obtain modified silicon dioxide emulsion; and adding a compatilizer into the modified nano cellulose solution, dropwise adding the modified silicon dioxide emulsion, and finally adjusting the viscosity.

The invention relates to an enzyme-mimic CeO2-based multi-active-site catalyst, a preparation method and application thereof, an electrolytic tank and a battery. CeO2 nanorods are synthesized through hydrothermal and high-temperature pyrolysis methods, and then metal ions are anchored to the surfaces of the CeO2 nanorods through strong interaction of carriers; metal nanoclusters and nanoparticles with specific sizes are synthesized, and then chemical vapor deposition reaction is performed through sodium hypophosphite, so that the bionic nano-enzyme electrocatalyst with multiple active sites is obtained. The multi-active-site catalytic material provided by the invention has high selectivity of ammonia production from nitrate radicals, ammonia production efficiency and Faraday efficiency when being used as a cathode. When the RuO2 is used as an anode, in an alkaline water electrolysis reaction, when the current density is 50 mA / cm < 2 >, the overpotential is 288 mV, which is far better than that of commercial RuO2. Based on excellent oxidation and reduction performance, the zinc nitrate battery has high power density, high ammonia yield and good charge-discharge cycle stability, and nitrate removal, ammonia production and power supply can be achieved at the same time.

The invention discloses a preparation method of plant-based polyester fibers, and relates to the technical field of high polymer materials. When the plant-based polyester fiber is prepared, firstly, phosphorus-modified dopamine is synthesized by taking dopamine hydrochloride and sodium hypophosphite as raw materials; carrying out copolymerization on the phosphorus-modified dopamine, terephthalic acid, ricinoleic acid and 1, 3-propylene glycol to prepare modified plant-based polyester; the preparation method comprises the following steps: synthesizing 2-bornyl-4, 6-dichloro-1, 3, 5-triazine from aminated carbon nanotubes, further synthesizing 2-bornyl-4, 6-dichloro-1, 3, 5-triazine from L-borneol and 2, 4, 6-trichloro-1, 3, 5-triazine, reacting the 2-bornyl-4, 6-dichloro-1, 3, 5-triazine with the aminated carbon nanotubes, and modifying with allylamine to obtain modified carbon nanotubes; finally, the modified plant-based polyester, the modified carbon nanotubes and auxiliaries are subjected to blending extrusion, melt spinning and treatment through copper nitrate and ascorbic acid, and the plant-based polyester fiber is prepared. The plant-based polyester fiber prepared by the invention has excellent antibacterial property, flame retardant property and mechanical property.

The application belongs to the technical field of nylon industrial yarn, and particularly relates to a nylon industrial yarn for airbag and a preparation method thereof. The preparation method of the nylon industrial yarn is as follows: taking nylon 66 salt and benzotriazole-phosphate derivative as raw materials, under the action of sodium hypophosphite, polycondensation is carried out to obtain modified nylon 66 chip, and then the nylon industrial yarn is prepared through melt spinning; the nylon industrial yarn is prepared by one-step direct polymerization, which can effectively avoid the problem of the decline of the comprehensive performance of the finished product nylon 66 caused by the flame-retardant modification, and the preparation process is simple and convenient for production; the prepared nylon industrial yarn has good strength, aging resistance and flame retardance, and has great market application value in the field of automobile airbag.

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 prepares an NP co-doped graphite nanosheet electrocatalyst, and has the advantages of simple and efficient preparation method, easy operation, low cost and practical application significance. The application takes cheap graphite powder as raw material, takes melamine and sodium hypophosphite as nitrogen source and phosphorus source respectively, and prepares the NP co-doped graphite nanosheet in a tube furnace through a high-temperature gas phase method. The NP co-doped graphite nanosheet is activated by electrochemistry to generate adjacent quinone structures with basic OER activity and further oxidize P-containing functional groups to obtain more phosphoric acid functional groups with HER activity, and the NP co-doped graphite nanosheet exhibits excellent electrocatalytic performance. The overpotential of the basic OER is only 314 mV, and the overpotential of the acidic HER is only-69.4 mV.

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 invention discloses a phosphorus-doped composite photo-anode catalyst for regulating and controlling a Co3O4 / Fe2O3 electronic structure as well as a preparation method and application of the phosphorus-doped composite photo-anode catalyst, and belongs to the technical field of hydrogen production by photoelectrochemical decomposition of water. The preparation method comprises the following steps that a Fe2O3 photo-anode is immersed in a ZIF-67 precursor solution, ZIF-67 is deposited in situ, and then a Co3O4 / Fe2O3 p-n heterojunction is obtained through calcination; and finally, carrying out annealing treatment by taking sodium hypophosphite as a phosphorus source in an inert atmosphere to realize phosphorus doping of Co3O4. According to the invention, the Co3O4 / Fe2O3 p-n heterojunction photoanode derived from ZIF-67 is prepared, and the electronic structure of Co3O4 is further modulated through P doping. Wherein an embedded electric field generated by the Co3O4 / Fe2O3 p-n heterojunction effectively promotes the rapid transfer of interface charges; p doping further adjusts the electronic structure of Co3O4, so that the energy barrier of the oxygen evolution reaction (OER) rate determination step is reduced, and the OER kinetics is accelerated; the synergistic effect of p-n heterojunction and electronic structure modulation significantly improves the water oxidation activity of Fe2O3.

The invention provides a fully degradable nanocellulose composite liquid mulching film and a preparation method thereof, and the preparation method comprises the following steps: adding hexadecyl trimethoxysilane into a nanocellulose solution, mixing and heating to obtain a hydrophobically modified cellulose solution; adding citric acid and sodium hypophosphite into the starch solution, mixing and heating for esterification reaction to obtain an esterification product, and adding deionized water after the esterification product is cooled to room temperature to obtain a product solution; mixing and stirring a gelatin solution and a dopamine solution to obtain a modified gelatin solution modified by polydopamine; mixing the modified gelatin solution with the product solution to obtain composite gel; mixing, shearing and emulsifying the modified cellulose solution, the composite gel, an emulsifier, a plasticizer and a water-retaining agent to obtain a composite emulsion; alkali liquor is dropped into the composite emulsion to adjust the pH value, then a cross-linking agent is added, and the composite liquid mulching film is obtained after mixing and heating.

The invention discloses high molecular weight polyacrylamide with a multi-branched chain structure, which is prepared from the following components in parts by weight: 90 to 120 parts of acrylamide, 20 to 25 parts of 2-acrylamide-2-methylpropanesulfonic acid, 5 to 8 parts of urea, 0.01 part of EDTA-2Na (Ethylene Diamine Tetraacetic Acid), 0.02 part of pentaerythritol triacrylate, 0.03 to 0.035 part of sodium hypophosphite, 0.015 to 0.018 part of initiator V-50 and 0.055 part of redox initiator. And 375 to 380 parts of deionized water. The invention also provides a preparation method of the high molecular weight polyacrylamide. Polyacrylamide has a controllable branched structure, pentaerythritol triacrylate and sodium hypophosphite are combined, the branching process is regulated and controlled through a chain transfer reaction, a branching point is efficiently introduced, meanwhile, gel generated by excessive crosslinking is accurately avoided, all components in the formula have a synergistic effect, urea promotes dissolution, EDTA-2Na eliminates metal ion interference, and the performance of the adhesive is improved. The polymerization condition is mild, and the product performance batch stability is high.

The invention discloses a nickel-vanadium-iron-based self-supporting electrode and a preparation method and application thereof. According to the preparation method, sodium metavanadate and nickel chloride are respectively used as a vanadium source and a nickel source, a sphere-like precursor composed of a sheet structure is synthesized on a foamed nickel substrate through a hydrothermal reaction, anhydrous sodium hypophosphite and ferric nitrate are used as a phosphorus source and an iron source, and the NiO-VO-FeP-coated NF self-supporting electrode is finally formed through phosphating treatment and soaking treatment. According to the electrode obtained by the invention, an adhesive does not need to be added, the preparation process is simplified, the production cost is reduced, the catalytic material is tightly combined with the substrate, the catalyst is prevented from falling off, and the seamless contact provides conditions for rapid transfer of charges, so that the activity of the catalyst is obviously improved. The electrode obtained by the invention has excellent oxygen evolution reaction activity and stability, the oxygen evolution reaction activity of the electrode exceeds that of a commercial RuO2 electrode under high current density, and the electrode shows a good industrial application prospect.

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.

The application discloses a synthesis method of a foamed nickel loaded iron-nickel-phosphorus C3N4 electrocatalytic material, and specifically comprises the following steps: S1, potassium ferricyanide, citric acid and C3N4 are weighed respectively and added into deionized water, and magnetic stirring is performed through a magnetic stirrer until complete dissolution; S2, 2cm*2cm foamed nickel is cut, surface impurities are washed away, and the treated foamed nickel is dried in a vacuum oven at 70 DEG C for 6h, and the dried foamed nickel is placed in the solution prepared in S1, and the reactor is sealed; S3, the foamed nickel in S2 is dried in a vacuum oven at 70 DEG C for 12h, is placed in the upstream of a porcelain boat, 450mg-550mg sodium hypophosphite is weighed and placed in the downstream of the porcelain boat, the porcelain boat is placed in the middle position of a tube furnace, and the foamed nickel is subjected to phosphating reaction in an argon atmosphere, the reaction temperature is controlled to be 345-355 DEG C, the reaction time is controlled to be 115-125min, and the foamed nickel loaded iron-nickel-phosphorus / C3N4 electrocatalytic material is obtained after the reaction is completed. The foamed nickel surface participates in the formation of a metal organic compound, so that the performance of the material is improved, and the service life of the material is prolonged.

The invention relates to a nano nickel electroplating process used after secondary zinc deposition of an aluminum alloy. The nano nickel electroplating process comprises two steps of preparing a plating solution and electroplating. A nano nickel agent A and a nano nickel agent B are added into the plating solution, and the nano nickel agent A comprises, by mass, 5%-9% of nickel sulfate, 6%-10% of sodium propargyl sulfonate, 5%-9% of sodium hypophosphite monohydrate and 72%-84% of deionized water; and the nano nickel B agent comprises the following components in percentage by mass: 5-9% of butynol alcohol ether sodium propane sulfonate, 6-10% of sodium propargyl sulfonate, 5-9% of sodium hypophosphite monohydrate and 72-84% of deionized water. Sodium propargyl sulfonate is coordinated with Ni < 2 + > in a high-activity area of a workpiece through electrostatic adsorption and coordination so as to inhibit deposition of Ni < 2 + >; the surface energy of a low-activity area of the workpiece is low, Ni < 2 + > deposition is basically not affected, negatively-charged propargyl sulfonate radicals can be attracted by weak positive charges in the area, and continuous generation of new crystal nucleuses is promoted. The sodium hypophosphite monohydrate can prevent Ni < 2 + > from being oxidized through reaction with oxygen. Butynol alcohol ether sodium propane sulfonate inhibits overgrowth of crystal grains and refines the crystal grain structure through adsorption and steric hindrance effect.

The application provides a viscosity-reducing polycarboxylic acid water-reducing agent, a preparation method and application thereof. The raw material of the viscosity-reducing polycarboxylic acid water-reducing agent comprises the following components in parts by weight: polycarboxylic acid 1000 parts, acrylic acid 150-750 parts, methacrylic acid 0-150 parts, ethylene glycol benzoate 100-500 parts, 98wt% concentrated sulfuric acid 3-10 parts, p-toluene sulfonic acid 0-5 parts, phenol 5-10 parts, 27.5wt% hydrogen peroxide 10-20 parts, reducing agent 1.2-2.4 parts, ferrous sulfate 0.003-0.03 parts, sodium hypophosphite 12-20 parts, 32wt% strong alkali solution 20-50 parts and water 1300-3000 parts. The polycarboxylic acid water-reducing agent contains a carboxyl group, a benzene group and a long side chain, has good dispersion and viscosity-reducing performance while ensuring the water-reducing effect, and can effectively improve the construction viscosity of concrete when added into high-strength and super-high-strength concrete.

The invention provides a preparation method of a nickel phosphide catalyst applicable to preparation of adipic acid by electro-oxidation of cyclohexanone and an electrolysis device, and belongs to the technical field of new energy chemical engineering, and the preparation method specifically comprises the following steps: putting foamed nickel into a high-pressure reaction kettle containing a mixed solution of nickel nitrate, ammonium fluoride and urea, reacting at 100-120 DEG C for 8-12 hours, filtering, washing, and drying to obtain the nickel phosphide catalyst applicable to preparation of adipic acid by electro-oxidation of cyclohexanone. The obtained nickel hydroxide is placed at the downstream of a tubular furnace, the obtained sodium hypophosphite is placed at the upstream of the tubular furnace, heating is conducted for 2-4 hours at the temperature of 300-400 DEG C under the inert atmosphere, the nickel phosphide catalyst with high adipic acid selectivity in the cyclohexanone electrooxidation reaction is obtained, the nickel phosphide catalyst is especially suitable for large-current and long-time catalytic reaction, and the productivity and efficiency in unit time are greatly improved. Meanwhile, the problem that a high-performance catalyst is complex to prepare is solved, the synthesis condition is mild, the process is simple, the reproducibility is good, expensive raw materials or complex equipment is not needed, the production cost is remarkably reduced, and a solid foundation is laid for large-scale industrial application.

This invention discloses a method for preparing a high-capacity, high-cycle-performance layered manganese dioxide cathode material. The method involves first immersing carbon cloth in a sodium permanganate solution, followed by a hydrothermal reaction to obtain a sample grown on the carbon cloth. Then, sodium hypophosphite is used as a phosphorus source for phosphating. Finally, electrochemical treatment yields a layered manganese dioxide material containing phosphorus in the bulk phase. This invention employs a simple method to prepare layered manganese dioxide doped with phosphorus in both the surface and bulk phases. The prepared layered manganese dioxide cathode material exhibits high capacity and long-cycle stability at a current density of 1 mA cm⁻¹. ‑2 At that time, the specific capacity was as high as 528 F g. ‑1 At a current density of 10 A g ‑1 It can still maintain 99% after 30,000 cycles.

The invention provides nickel-based powder, an alkaline water electrolysis hydrogen production electrode and a preparation method, and relates to the technical field of surface treatment. The preparation method of the nickel-based powder comprises the following steps: sequentially carrying out sensitization and activation treatment on aluminum powder through a SnCl2-HCl solution and a PdCl2 solution; adding the activated aluminum powder into a target solution, and carrying out a water bath heating reaction; wherein the target solution comprises nickel sulfate, sodium citrate, citric acid, sodium hypophosphite and thiourea; carrying out vacuum filtration, washing and drying treatment on the product subjected to water bath heating to obtain intermediate nickel-based powder; the intermediate nickel-based powder, a nickel powder raw material, a wet grinding medium and a forming agent are put into a ball mill to be subjected to wet grinding and mixing, and mixed slurry is obtained; and the mixed slurry is converted into spherical agglomerated powder in a spray granulation mode, the spherical agglomerated powder is sintered, cooled and sieved, and the nickel-based powder is obtained. According to the invention, the problem of performance degradation of the alkaline electrolytic water hydrogen production electrode caused by oxidation of the nickel-based coating can be effectively inhibited.

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.

The invention provides a process method for improving the brightness of an amorphous Ni-Sn-P coating. The process method comprises the following steps: (1) preparing a plating solution: sequentially mixing nickel sulfate hexahydrate, trisodium citrate dehydrate, sodium potassium tartrate tetrahydrate, succinic acid, lauryl sodium sulfate, ammonium acetate, sodium hypophosphite and tin tetrachloride pentahydrate, adding water, and uniformly stirring to obtain the plating solution; and (2) activation before chemical plating is started, specifically, before chemical plating, a to-be-plated metal substrate is subjected to electric activation treatment in advance, the substrate serves as a cathode, a Ni sheet serves as an anode, the cathode and the anode are placed in a chemical plating solution in parallel, energization activation is conducted, chemical plating is conducted after electric activation, and the bright amorphous Ni-Sn-P plating layer is obtained. The bright amorphous Ni-Sn-P plating layer is composed of the following components in atomic percent: 55%-90% of Ni, 5%-20% of Sn and 5%-25% of P, the thickness is 1-50 microns, and the highest brightness can reach 490 Gu.

The invention provides a phosphorus-doped covalent triazine framework material as well as a preparation method and application thereof, the phosphorus-doped covalent triazine framework material is synthesized from a covalent triazine framework material and sodium hypophosphite, and the mass ratio of the sodium hypophosphite to the covalent triazine framework material is (0.005-0.05): 1. According to the phosphorus-doped covalent triazine framework material as well as the preparation method and the application thereof provided by the invention, bisphenol A in water can be efficiently photocatalytically degraded.

This invention discloses a core-shell structured nickel-cobalt hydroxide / nickel-cobalt phosphide composite electrode and its preparation method, relating to the fields of materials engineering and manufacturing technology. The preparation method includes the following steps: adding nickel nitrate hexahydrate, cobalt nitrate hexahydrate, sodium citrate, potassium hydroxide, and ammonia to deionized water, and stirring to react to obtain nickel-cobalt hydroxide; placing sodium hypophosphite and nickel-cobalt hydroxide in a tube furnace and treating at high temperature under argon to obtain a nickel-cobalt phosphide composite material; mixing the nickel-cobalt phosphide composite material, PVDF, and carbon black to obtain a slurry, coating it on carbon cloth, and electrochemically activating it to obtain the composite electrode. The composite electrode of this invention has a large specific surface area and high resistance to OH-. ‑ It has strong adsorption capacity and abundant reactive sites; nickel cobalt hydroxide and nickel cobalt phosphide synergistically participate in the electrode reaction, giving the electrode an extremely high specific capacity; due to the heterostructure and the high conductivity of nickel cobalt phosphide, the electrode has excellent conductivity and excellent rate performance.

The invention relates to the technical field of medical dressings, and discloses a preparation method of a degradable medical abdominal pad, the abdominal pad is a homogeneous precursor sol formed by mixing polyvinyl alcohol, sodium carboxymethyl cellulose, D-sorbitol, anhydrous citric acid, itaconic acid, sodium hypophosphite monohydrate and ammonia water, and sequentially carrying out freeze-drying forming, thermally induced cross-linking and radiation cross-linking. In the preparation process, ammonia water is utilized to neutralize polycarboxylic acid to maintain homogeneous dispersion, and a porous physical skeleton is constructed through freeze-drying; then heating to decompose the ammonium salt to release ammonia gas, performing in-situ pore-forming and catalytic dehydration esterification reaction, and removing internal residues in combination with circulating pulse degassing treatment; and finally, triggering a carbon-carbon double bond to carry out addition polymerization by adopting high-energy rays. According to the invention, staged triggering of chemical crosslinking and physical forming is realized, a double crosslinking network of ester bonds and carbon chains is constructed, the wet mechanical strength of the polysaccharide-based dressing after absorbing body fluid is improved, and excessive swelling and disintegration are inhibited.

The invention provides a preparation method of a Fe-doped NiCoP nanosheet array rich in phosphorus defects, which comprises the following steps: firstly, adding foamed nickel into a reaction solution containing cobalt salt, 2-methylimidazole ligand and deionized water, and growing a Co-ZIF-L nanosheet array on a substrate after reaction; then the Co-ZIF-L is added into a potassium ferrocyanide solution, and Fe-Co PBA is obtained after a reaction; then, sodium hypophosphite is used as a phosphorus source, and the Fe-Co PBA is subjected to phosphating in a tubular furnace to generate Fe-NiCoP; and finally, the Fe-NiCoP is reduced in the H2 / Ar atmosphere, and the Fe-doped NiCoP nanosheet array rich in phosphorus defects is obtained. The number of active sites, conductivity and stability of the material are increased by utilizing construction of a hollow structure and introduction of phosphorus defects, so that the electric hydrolysis performance is improved.

The invention belongs to the technical field of concrete admixtures, and particularly provides a hexa-carbon workability mother solution and a preparation process thereof. The hexa-carbon workability mother liquor is prepared from the following raw materials: ethylene glycol monovinyl polyethylene glycol ether, sodium hypophosphite, hydrogen peroxide, ammonium persulfate, acrylic acid, a workability functional monomer, ferrous sulfate and a response type reducing agent. The workability functional monomer is prepared by carrying out a reaction on pentaerythritol triacrylate, glycidyl methacrylate and 2-hydroxyethyl methacrylate; the response type reducing agent is prepared by wrapping a reducing agent with gelatin-chitosan. The hexa-carbon workability mother liquor prepared by the invention has good and lasting plasticity-retaining property, water-retaining property and stability.

The invention discloses a heteroatom-doped nickel phosphide-based catalyst and a preparation method thereof, and the preparation method comprises the following steps: taking P123, carboxymethyl cellulose sodium, urea and ammonium fluoride; adding into ethylene glycol and water, and carrying out ultrasonic treatment to obtain a solution 1; dissolving nickel salt, sodium hypophosphite or sodium phosphite and second metal salt in water to obtain a solution 2; mixing the solution 2 and the solution 1 to obtain a solution 3; soaking a pretreated clean nickel-based substrate material in the solution 3, and carrying out hydrothermal treatment to obtain a nickel phosphide-based composite electrode material; terephthalic acid is added into N, N-dimethylformamide, and a solution 4 is obtained; dissolving ferric trichloride in water to obtain a solution 5; mixing the solution 4 and the solution 5, adding to obtain a solution 6, soaking the nickel phosphide-based composite electrode material in the solution 6, sealing and heating; cooling to room temperature, and washing; and drying to obtain the heteroatom-doped nickel phosphide-based catalyst. The catalyst has high activity and high stability, and can continuously produce hydrogen with large current in an electrolyte for a long time.

The preparation method comprises the following steps: dissolving a plurality of metal ion inorganic salt hydrates, thiourea, a complexing agent and a pH regulator in ethylene glycol, and uniformly stirring to obtain a hydrothermal reaction solution; immersing a conductive substrate into the hydrothermal reaction liquid, heating to a first target temperature in a range of 120-200 DEG C, and maintaining for 6-12 hours to complete a hydrothermal reaction, so as to obtain a spinel precursor array which grows on the surface of the conductive substrate in situ and comprises sulfur vacancies and oxygen vacancies; respectively placing the conductive substrate on which the spinel precursor array grows and sodium hypophosphite in tubular heating equipment, and introducing inert gas; the sodium hypophosphite is arranged at the upstream of the airflow; heating to a second target temperature in the range of 280-400 DEG C, and keeping for 1-3 hours to complete a phosphating reaction to obtain a catalytic electrode which is a conductive substrate covered with a spinel array on the surface; the spinel array comprises a plurality of metal-phosphorus bonds generated by a plurality of phosphorus oxysulfur vacancies. The uranium extraction rate and the electrochemical stability of the electrode are improved.