15 results about "Hypophosphite" patented technology

The invention discloses preparation and application of a nickel selenide / ferronickel phosphate crystal / amorphous heterogeneous catalyst, and relates to the technical field of electrochemistry. Selenizing the foamed nickel at low temperature in an inert atmosphere to generate a crystalline NiSex layer in situ; and by taking the obtained electrode as a working electrode, carrying out electrodeposition in a deposition solution containing nickel salt, ferric salt, hypophosphite and acetate by adopting a cyclic voltammetry method, so that amorphous NiFePOy is deposited on the surface of NiSex, and a NiSex / NiFePOy crystal / amorphous heterostructure nanosheet layer is constructed and is used for an alkaline medium urea oxidation reaction. The invention has the following beneficial effects: crystalline / amorphous interface coupling and a nanosheet self-supporting structure synergistically improve active sites and charge transfer capability, reduce energy consumption and improve current output; meanwhile, the electrode stability and durability are enhanced; the method has the advantages of low material cost, mild and simple process, suitableness for amplified preparation, and application potential of urea-assisted water electrolysis energy-saving hydrogen production.

This invention relates to the field of electroless plating technology, and more particularly to a low-phosphorus electroless nickel plating solution and a method for nickel plating on an aluminum alloy substrate. The low-phosphorus electroless nickel plating solution comprises the following components by mass concentration: a nickel ion source in the form of Ni... 2+ Calculated as 1.0~5.0 g / L; hypophosphite as H2PO2 ‑ The concentrations are calculated as follows: 20–45 g / L; glycine 5–40 g / L, gluconate 5–60 g / L; polyaspartic acid and / or its salts 0.2–5.0 g / L; pH buffer 2–25 g / L; alkyl glycosides 0.05–1.0 g / L; iodate stabilizer, in IO3... ‑ The concentration is calculated to be 0.2~5.0 mg / L. This invention maintains a high deposition rate and significantly improves the tolerance of by-products in the bath solution under low nickel ion concentration conditions. It is also free of heavy metals and sulfur-containing organic stabilizers, reducing the metal load and environmental risk of the waste liquid. It is suitable for various aluminum alloy matrices treated with double zinc replacement.

The present invention relates to the field of halogen-free organophosphorus flame-retardant nylon, and in particular to a nylon composite material, and a preparation method therefor and a use thereof. Specifically, the nylon composite material disclosed in the present invention comprises: 65-82 parts of polyamide resin, 12-18 parts of a hypophosphite flame retardant, 10-50 parts of a reinforcing agent, 0.5-2 parts of hydrotalcite, 3-8 parts of boehmite, and 1-3 parts of PET resin. The present invention solves the problem of corrosion of organophosphorus flame-retardant nylon materials to silicone under high-temperature conditions, and provides an organophosphorus flame-retardant nylon composite material resistant to silicone corrosion under high-temperature conditions, having a high CTI value and meeting the UL94 V0 flame retardant rating.

The invention discloses a preparation method and application of a Ni2P-loaded rare earth doped nickel-based micro-mesoporous material, and the method comprises the following steps: jointly dissolving hypophosphite, nickel salt and rare earth metal salt in a solvent for hydrothermal reaction, cleaning, drying and grinding the product to obtain rare earth metal doped nickel phosphite with a micro-mesoporous structure, and drying to obtain the Ni2P-loaded rare earth doped nickel-based micro-mesoporous material. And under the protection of inert atmosphere, co-calcining the Re-NiPO and phosphite in a non-mixing manner, and carrying out phosphating reaction to form nickel phosphide particles on the surface and in pores of the Re-NiPO, thereby obtaining the Ni2P-loaded rare earth doped nickel-based micro-mesoporous material. A series of Ni2P-coated Re-NiPO (Re = La, Ce, Sm) heterojunction materials are prepared through a hydrothermal-phosphating method, and the hard magnetic property and the catalytic activity can be improved at the same time.

The invention provides an iron nickel phosphide coated NiMoO4 nano array electrocatalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: S1, dissolving a first nickel salt and a molybdenum source in water, carrying out first heating reaction together with foamed nickel, and carrying out heat preservation, so that a NiMoO4 nano array grows on the surface of the foamed nickel to obtain a product; s2, ammonium fluoride, urea, ferric salt and second nickel salt are dissolved in water and then mixed with a product obtained in the step S1, a second heating reaction is conducted, heat preservation is conducted, a FeNi-LDH shell layer grows on the surface of the NiMoO4 nano array, and a product is obtained; s3, hypophosphite and a product obtained in the step S2 are subjected to high-temperature phosphating treatment, FeNi-LDH is converted into a Fe3P / Ni3P heterojunction structure, and the NiMoO4 nano array electrocatalyst coated with the iron-nickel phosphide is obtained. The electrocatalyst has a relatively high active surface area, and has relatively good catalytic performance and stability when being used for electrolyzing seawater.

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 invention relates to the technical field of hypophosphite synthesis, and provides a hypophosphite synthesis device and method.The hypophosphite synthesis device comprises a reaction tower body and further comprises a three-stage reaction mechanism, a liquid separation mechanism, a reaction prolonging mechanism, an anti-scaling mechanism and a bottom discharging mechanism; the liquid separation mechanism is mounted in the reaction tower body, the liquid separation mechanism is matched with the three-stage reaction mechanism and is used for uniformly distributing product liquid at a reaction position, the reaction extension mechanism is mounted in the reaction tower body and is used for delaying the time of a reaction product entering a next-stage reaction, and the anti-scaling mechanism is mounted in the reaction extension mechanism and is used for washing blocked yellow phosphorus particles. By means of the technical scheme, the problems that in the prior art, the maintenance process of a reaction tower is tedious, the tower needs to be disassembled for cleaning internal components, and the production efficiency is greatly influenced by frequent shutdown inspection and maintenance are solved.

The invention discloses a copper bar surface anti-oxidation treatment process, and belongs to the technical field of metal material surface protection and corrosion resistance evaluation, and the copper bar surface anti-oxidation treatment process comprises the following steps: carrying out film removal activation and micro roughening treatment on a copper bar; the copper bar is placed in an aqueous solution containing hypophosphite or phosphate and treated for 1-5 minutes at the temperature of 60-90 DEG C, so that a P-enriched interface layer is formed on the copper surface layer, and the P atomic fraction of the interface layer is 2%-8%; depositing an aluminum oxide or titanium oxide thin layer on the interface layer by adopting an atomic layer deposition process, wherein the substrate temperature is 80-120 DEG C and the total thickness is 5-30 nm; a phosphorus-rich interface layer is constructed in sequence, a compact inorganic thin layer is deposited, low-energy pulse laser sealing is implemented, and a silicon-oxygen sealing layer containing a two-dimensional sheet layer is formed, so that the oxygen blocking capability and the appearance stability can still be considered under the thin layer condition; the problem that electricity and color are difficult to stabilize at the same time when the thickness of a traditional single-layer or random laminated film is limited is solved.

The application belongs to the technical field of aluminum diethyl hypophosphite synthesis, and particularly relates to a preparation method and application of aluminum diethyl hypophosphite. The preparation method of the aluminum diethyl hypophosphite comprises the following steps: mixing soluble hypophosphite and a first solvent in a reactor to obtain a soluble hypophosphite solution; replacing air in the reactor with nitrogen and heating; introducing ethylene into the soluble hypophosphite solution to obtain a reaction solution; mixing an initiator, a catalyst and the reaction solution, reacting, obtaining a diethyl hypophosphite solution, adding a second solvent to obtain a diluted diethyl hypophosphite solution; adjusting the pH of the diluted diethyl hypophosphite solution to be acidic, adding an aluminum sulfate aqueous solution, and reacting to obtain the aluminum diethyl hypophosphite. The initiator comprises an oxidizing agent and a reducing agent. The application can reduce the reaction temperature to 22-50 DEG C, reduce energy consumption, improve the reaction efficiency, and obtain the aluminum diethyl hypophosphite with high purity and high yield.

The invention relates to a chemical nickel plating wastewater treatment agent and a treatment method. The treatment agent comprises the following components: 1-5 wt% of sodium tungstate, 50-60 wt% of ferrous sulfate, 15-20 wt% of aluminum sulfate, 10-15 wt% of magnesium sulfate and 10-15 wt% of calcium chloride. The treatment method comprises the following steps: S1, adjusting the pH value of the chemical nickel plating wastewater to be treated to 2-3; s2, carrying out iron-carbon micro-electrolysis on the chemical nickel-plating wastewater treated in the step S1; s3, adding the chemical nickel-plating wastewater treatment agent according to any one of claims 1-3 into the chemical nickel-plating wastewater treated in the step S2, uniformly stirring, and adding an oxidizing agent for oxidation; and S4, adjusting the pH value of the chemical nickel-plating wastewater treated in the step S3 to 4.5-6, then adding a flocculating agent for flocculation, and carrying out solid-liquid separation. According to the method, hypophosphite and heavy metal in the chemical nickel-plating wastewater can be efficiently removed at low cost.

The invention discloses a nickel-based catalyst as well as a preparation method and application thereof. The preparation method of the nickel-based catalyst comprises the following steps: S1, carrying out electro-deposition on a deposition solution in a three-electrode system taking foamed nickel as a working electrode; a precursor material is obtained; the deposition liquid comprises nickel salt, cobalt salt, thiourea and a phosphorus source; the phosphorus source comprises hypophosphite and / or phosphite; and S2, carrying out annealing treatment on the precursor material. The nickel-based catalyst prepared by the preparation method disclosed by the invention is applied to a urea oxidation reaction and has relatively good catalytic activity and stability.

The application discloses a water-based fire-retardant coating special fire-retardant agent and a preparation method thereof. The application firstly prepares a melamine cyanurate microencapsulated hypophosphite phosphorus-nitrogen synergistic fire-retardant system through chemical bonds and hydrogen bonds, then carries out hyperbranched silane modification, and finally forms a firm dendritic structure on the surface of the hyperbranched phosphorus-nitrogen synergistic fire-retardant system through post-chain extension crosslinking in a water-based coating polycondensation reaction and emulsification reaction, so as to obtain the water-based fire-retardant coating special fire-retardant agent. The fire-retardant agent has good fire-retardant effect when applied in the water-based coating, low system viscosity, good compatibility with a matrix, good dispersibility and good migration and precipitation resistance, and the hyperbranched silane modification has a certain crosslinking degree, so that the contact angle and the mechanical properties of the matrix are improved.

To provide a transformant exhibiting a containment effect independent of phosphorous acid.SOLUTION: The transformant is deficient in functions of a gene encoding a phosphate transporter protein and a gene encoding a phosphate ester transporter protein, and has a gene encoding a hypophosphite-specific transporter protein introduced thereinto.SELECTED DRAWING: Figure 1

The application is a kind of O3 type sodium ion battery positive electrode material of reducing method induced residual base conversion. The chemical formula of the positive electrode material is Na 1+x Ni 0.33 Fe 0.33 Mn 0.33 P x O 2+2x In the preparation, the selected reducing acid salt, including but not limited to hypophosphite or bisulfite, is used as a residual base eliminator and a reducing agent, and through grinding and calcination, the mechanism of acid-base neutralization reaction and redox reaction is used to realize the functions of residual base conversion coating and surface coordination environment adjustment. The first coulombic efficiency of the battery obtained by the application is as high as 94%, the voltage hysteresis is greatly reduced, the capacity retention rate after 300 cycles at 1C is increased from 38% to 84%, and a new generation of coating scheme with great potential for scaling is provided for layered positive electrode materials.

To provide a method of manufacturing a printed wiring board which is excellent in formation accuracy even with a small L / S, can form a circuit pattern having high adhesion, and is excellent in working environment.SOLUTION: A method for producing a printed wiring board, comprising the following steps 1 to 7 in this order: Step 1: A step of attaching a first catalyst to a surface of an insulating material. Step 2: a step of adhering a second catalyst containing at least nickel to the surface of the insulating material by bringing the insulating material into contact with an electroless nickel plating solution containing hypophosphite as a reducing agent. Step 3: a step of forming a seed layer by contact with an electroless copper plating solution containing hypophosphite as a reducing agent. Step 4: a step of forming a resist pattern on the surface of the seed layer. Step 5: a step of forming a copper layer by electrolytic copper plating in a region exposed from the resist pattern. Step 6: Step of removing the resist pattern. Step 7: a step of removing the exposed seed layer and the first catalyst and the second catalyst between the seed layer and the insulating material to obtain a circuit pattern.SELECTED DRAWING: Figure 1