46 results about "Hypophosphite" patented technology

The invention relates to the technical field of electroplating, and particularly discloses a nickel-tungsten-phosphorus plating layer electroplating process which comprises the following steps: S1, preparing a nano composite electroplating solution which comprises nickel salt, tungstate, hypophosphite, nano silicon carbide powder, ZIF-67 (at) MXene core-shell nanosheets, a composite complexing agent and water; s2, plasma mixed gas is adopted for conducting etching treatment on the surface of the workpiece to be plated; s3, electroplating the to-be-electroplated workpiece subjected to surface treatment under the action of pulse current and an alternating magnetic field, and performing ultrasonic stirring on the composite electroplating liquid in the electroplating process; and S4, under nitrogen protection, the workpiece is subjected to annealing treatment. According to the electroplating process, through the synergistic effect of the nano SiC and the ZIF-67 (at) MXene, the component uniformity and the structural compactness of the nickel-tungsten-phosphorus coating can be effectively improved, and then the corrosion resistance of the nickel-tungsten-phosphorus coating in the complex oil gas environment is effectively improved.

The invention relates to the technical field of waste liquid treatment, in particular to a method for efficiently separating nickel, hypophosphorous acid and ammonia from chemical nickel plating waste liquid, which comprises the following steps: S1, nanofiltration: carrying out nanofiltration separation on chemical nickel plating waste water by using a roll type nanofiltration membrane to obtain nickel-containing waste water and waste water containing hypophosphorous acid and ammonia; s2, bipolar membrane electrodialysis: setting an arrangement mode of a bipolar membrane electrodialysis system as follows: sequentially arranging an anode, a first bipolar membrane, an anionic membrane, a cationic membrane, a second bipolar membrane and a cathode, introducing wastewater containing hypophosphorous acid and ammonia into a desalination chamber, and adding deionized water into an acid chamber and an alkali chamber to obtain a hypophosphorous acid solution and ammonia gas; separation of hypophosphorous acid and ammonia is realized; according to the method, hypophosphite and ammonium in the chemical nickel-plating waste liquid are efficiently separated, and the method has important significance on improving the resource utilization efficiency of phosphorus and ammonia in the chemical nickel-plating waste liquid and reducing the treatment difficulty and treatment cost of the chemical nickel-plating waste liquid.

The present invention provides a flame retardant mixture, aluminum diethylphosphinate and a preparation method therefor. The preparation method includes: heating a sodium hypophosphite solution to a first temperature, dropwise adding an initiator, introducing ethylene, maintaining a pressure at 0.30-0.75 MPa, and carrying out an initiation reaction until the reaction is completed; and adjusting the solution to a second temperature, dropwise adding an aluminum sulfate solution for a reaction under heat preservation at normal pressure, performing filtration, and collecting a precipitate to obtain aluminum diethylphosphinate containing a telomer. According to the present invention, an initiator with strong oxidability is not used, such that oxidation of a hypophosphite in a reaction system and subsequent products brought thereby are reduced, for example, aluminum phosphate, aluminum phosphite, aluminum ethylphosphonate and the like are not generated as a result of the reaction. The present invention can be implemented at a relatively low temperature and a relatively low pressure, realizing high-efficiency conversion. The present invention is easy to operate and uses water as a solvent, hazardous materials requiring disposal are not generated or contained after completion of a chemical reaction, raw materials are readily available, and industrial production can be achieved without the need for special devices.

The utility model discloses an integrated device for removing hypophosphite in wastewater. The integrated device comprises an oxidation column, a water inlet and a water outlet are formed in the two sides of the oxidation column respectively, the water outlet is connected to a sedimentation tank, an electrode plate is arranged in the sedimentation tank and connected to an external power supply, and a water outlet pipe is arranged on the sedimentation tank; comprising an ozone generator which is connected to an oxidation column through an air inlet pipe, and a concentration detector is arranged on the air inlet pipe. The ozone catalytic oxidation technology is adopted, the aluminum-based catalyst is adopted for catalyzing ozone to generate hydroxyl free radicals, hypophosphite in waste water is oxidized into orthophosphate, meanwhile, organic pollutants can be degraded, finally, ozone is decomposed to generate oxygen, new pollutants are not generated in the reaction, and the technology is a green technology. The pole plate material of the electric flocculation unit adopts an iron plate, iron ions are generated by electrifying and are combined with generated orthophosphate to form precipitate removal, no extra medicament is needed in the technological process, the mud yield is low, and the operation is simple and convenient.

The invention discloses an efficient and stable electroplating hydrogen evolution electrode and a preparation method and application thereof. The preparation method comprises the following steps that S1, a conductive substrate material is prepared and pretreated; s2, an electroplating solution is prepared, wherein the electroplating solution comprises a solvent, nickel salt, hypophosphite, a buffering agent and a complexing agent; and S3, three-electrode deposition is carried out with the electroplating liquid as an electrolyte and the pretreated conductive substrate material as a working electrode, and the efficient and stable electroplating hydrogen evolution electrode is obtained. The prepared electrode is a phosphate material with an amorphous structure, has a larger catalytic interface and more reaction active sites, and is beneficial to rapid diffusion of ions or small molecules due to the fact that open active pore channels of the electrode form permeable channels; through the synergistic effect of electrochemical parameters, the composite material has the capability of being stable for a long time under high current density. The preparation method disclosed by the invention is simple to operate, low in cost, low in equipment and process condition requirements and easy for industrial large-scale production.

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.

The invention discloses a polyphenyl ether composition as well as a preparation method and application thereof. The polyphenyl ether composition comprises the following components in parts by weight: 9-26 parts of PPE resin, 19-41 parts of PA resin, 5-10 parts of a phosphorus-containing flame retardant A, 2-6 parts of a phosphorus-containing flame retardant B, 5-15 parts of a compatilizer and 10-40 parts of glass fibers. The zero cutting viscosity of the polyphenyl ether composition is 10000 to 100000 Pa * s; the average retention length of the glass fibers is 0.2 to 0.35 mm; the phosphorus-containing flame retardant A is selected from one or more of hypophosphite flame retardants, red phosphorus and polyphosphate flame retardants; the phosphorus-containing flame retardant B is selected from one or more of phosphate flame retardants and phosphazene flame retardants. The polyphenyl ether composition disclosed by the invention has relatively good ablation resistance.

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 relates to a flame retardant and a preparation method and application thereof, and relates to the technical field of flame retardants, the preparation method of the flame retardant comprises the following steps: adding hypophosphite, polyethylene glycol and a silane coupling agent into water, and stirring to obtain a first mixture; performing pulsed electric field treatment on the first mixture to obtain a second mixture; and filtering the second mixture, and washing and drying the obtained solid product to obtain the flame retardant. According to the invention, a material system composed of hypophosphite, polyethylene glycol and a silane coupling agent is modified by adopting a pulsed electric field technology, so that the physical properties such as particle size distribution and particle regularity of hypophosphite are remarkably improved, and the compatibility and flame-retardant effect of hypophosphite and a high polymer material are also improved; the defects of the existing hypophosphite flame retardant are overcome.

The application discloses nitrogen-doped iron phosphide and a preparation method thereof, a negative electrode material, a secondary battery and an electric equipment, and the preparation method comprises the following steps: S1, dissolving iron salt and urea in an organic solvent to obtain a mixed solution; then, performing a solvothermal reaction on the mixed solution to obtain an iron phosphide precursor; and S2, performing phosphorization treatment on the iron phosphide precursor by using a hypophosphite under a protective atmosphere to obtain the nitrogen-doped iron phosphide. The nitrogen-doped iron phosphide prepared by the method overcomes the problems of large irreversible capacity and low electronic conductivity of the iron phosphide negative electrode material.

The invention belongs to the technical field of synthesis of diethyl aluminum hypophosphite, and particularly relates to a preparation method and application of diethyl aluminum hypophosphite. The preparation method of the diethyl aluminum 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 raising the temperature; ethylene is introduced into the soluble hypophosphite solution to obtain a reaction solution, then an initiator, a catalyst and the reaction solution are mixed and react to obtain a diethyl hypophosphite solution, and then a second solvent is added to obtain a diluted diethyl hypophosphite solution; the pH of the diluted diethyl hypophosphite solution is adjusted to be acidic, an aluminum sulfate aqueous solution is added, a reaction is conducted, and diethyl aluminum hypophosphite is prepared; the initiator comprises an oxidizing agent and a reducing agent. According to the method, the reaction temperature can be reduced to 22-50 DEG C, the energy consumption is reduced, the reaction efficiency can be improved, and the prepared diethyl aluminum hypophosphite is high in purity and high in yield.

The application discloses a fire-resistant and burn-resistant nylon composition and a preparation method and application thereof. The nylon composition comprises the following components in parts by weight: 28-60 parts of aliphatic nylon resin, 4-15 parts of semi-aromatic nylon resin, 18-32 parts of glass fiber, 12-21 parts of hypophosphite, 3-9 parts of flame-retardant synergist, and 1-4 parts of carbonation promoter, wherein a mass ratio of the hypophosphite to the flame-retardant synergist is (2-4) to 1; a relative viscosity of the aliphatic nylon resin is 2.6-2.9; and the carbonation promoter is rare earth oxide or zinc stannate. The organic phosphorus flame-retardant nylon composition has excellent flame-retardant performance and fire-resistant performance, and can also have high mechanical performance.

Hypophosphite is used to inhibit syntrophic methanogenesis or growth of hydrogenotrophic methanogens, plants are genetically engineered to comprise and express a heterologous hypophosphite / 2-oxoglutarate dioxygenase htxa gene to enable the use of the reduced phosphorus, such as hypophosphite as a phosphorus source, and hypophosphite and phosphite fertilizer amendments are utilized as phosphorus sources by soil microorganisms, to increase carbon storage in deep sediments.

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 discloses a polypropylene composition and a preparation method and application thereof. The polypropylene composition comprises the following components by weight: 90-95 parts of polypropylene; 1-2 parts of hypophosphite; 0.5-2 parts of bromine flame retardant; 0.2-0.5 parts of flame retardant synergist; 0.1-0.4 parts of primary antioxidant; 0.1-0.4 parts of auxiliary antioxidant; 0.2-0.4 parts of hindered amine light stabilizer other than N-substituted alkoxy hindered amine; the flame retardant synergist is one or more of N-substituted alkoxy hindered amines. The polypropylene composition provided by the invention has the advantages of high temperature failure resistance, long powdering time and not easy to change color during processing.

The organic phosphonate flame retardant prepared by the invention is obtained by reacting dialkyl hypophosphorous acid or dialkyl hypophosphite with halogenated alkyl phosphine oxide in a solvent and then separating and purifying, the synthesis method is simple, the use of high-pollution and high-toxicity substances is avoided, the synthesis structure is clear, and the temperature resistance is not influenced by residues of reactive hydrogen on phosphorus. Meanwhile, the synthesized ester group-containing organic phosphonate flame retardant provides better flame retardant property under the condition of lower additive amount, and the resin has higher retention rate of mechanical property and electrical property due to the low additive amount.

The present application relates to waste liquid treatment technical field, specifically to a kind of from chemical nickel plating waste liquid high-efficiency separation nickel, hypophosphorous acid and ammonia method, comprising the following steps: S1, nanofiltration: using roll nanofiltration membrane to chemical nickel plating waste water is nanofiltration separation, obtain containing nickel waste water, containing hypophosphorous acid and ammonia waste water;S2, bipolar membrane electrodialysis: the arrangement mode of bipolar membrane electrodialysis system is set to: the anode, first bipolar membrane, anion membrane, cation membrane, second bipolar membrane, cathode are sequentially arranged, containing hypophosphorous acid and ammonia waste water is passed into desalination room, deionized water is added in the acid room and base room, obtain hypophosphorous acid solution and ammonia gas;Then realize the separation of hypophosphorous acid and ammonia;The hypophosphite in the present application, ammonium in chemical nickel plating waste liquid is efficiently separated, and it is important to improve the phosphorus, ammonia resource utilization efficiency in chemical nickel plating waste liquid, reduce chemical nickel plating waste liquid processing difficulty and processing cost.

The invention relates to the technical field of hydrocarbon cleaning agents, and discloses a hydrocarbon cleaning agent capable of preventing metal surface oxidation and a preparation method of the hydrocarbon cleaning agent capable of preventing metal surface oxidation. Comprising the following components in parts by weight: 75-85 parts of hydrocarbon, 5-15 parts of an alcohol ether compound, 2-5 parts of an organic phosphorus compound, 0.5-10 parts of a phenol free radical reaction terminator, 0.1-2 parts of an oxygen scavenger, 2-4 parts of a crown ether compound, 1-2 parts of hypophosphite, 0.1-0.2 part of glacial acetic acid, 0.5-3 parts of an amide compound, 1-4 parts of a sulfoxide compound and 2-6 parts of a higher fatty alcohol sulfate compound. The hydrocarbon cleaning agent for preventing the metal surface from being oxidized is high in dirt-removing power, capable of washing off oil stains on the surfaces of iron parts and steel parts, capable of repairing rust spots on the surfaces of the iron parts and capable of forming protective films on the surfaces of the iron parts and the steel parts so as to achieve the effect of delaying oxidation corrosion, has a certain flame-retardant effect and is higher in safety.

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 phosphorus-containing polymer and a preparation method and application thereof, the phosphorus-containing polymer comprises a repeating unit derived from an alpha, omega-non-conjugated diene monomer and a repeating unit derived from a phosphorus source monomer, the alpha, omega-non-conjugated diene monomer is selected from diallyl oligomeric ethylene glycol, diallyl piperazine, diallyl ether, octadiene and the like, and the phosphorus source monomer is selected from diallyl oligomeric ethylene glycol, diallyl piperazine, diallyl ether, octadiene and the like. The phosphorus source monomer is selected from hypophosphorous acid and hypophosphite. The lithium salt compound polyelectrolyte based on the phosphorus-containing polymer has quite high conductivity and can be used for a lithium ion battery; the polyphosphonate surfactant disclosed by the invention has the characteristics of chemical stability, biocompatibility, hydrophilicity and the like, and the alkyl phosphonate surfactant shows diversified functions and purposes; the flame retardant based on the phosphorus-containing polymer has excellent flame retardant property.

The invention belongs to the field of flame retardant preparation and application, and discloses flame-retardant modified hypophosphite and a preparation method thereof.The flame-retardant modified hypophosphite is of a double-layer coating structure, the inner core is hypophosphite, the inner layer is phosphite, and the outer layer is cyanurate; the preparation method of the flame-retardant modified hypophosphite comprises the following steps: firstly, jointly adding the hypophosphite and the soluble metal salt into water, heating to 80-100 DEG C, stirring for 15-30 minutes, then adding the alkaline substance I into the water, keeping the temperature to react for 0.5-4 hours, adding the phosphorous acid, continuing to react for 0.5-4 hours, then adding the alkaline substance II into the water, stirring for 15-30 minutes, adding the cyanuric acid, keeping the temperature to react for 0.5-4 hours, and performing post-treatment to obtain the flame-retardant modified hypophosphite. The flame-retardant modified hypophosphite prepared by the method does not belong to inflammable solids, and is high in thermal decomposition temperature, better in safety, reasonable in preparation process, high in product yield, wide in raw material source and easy for industrial production.

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 hypophosphite is used for inhibiting a syntrophic methanogenesis effect or the growth of hydrogen nutritional methanogens, and a plant gene is modified to contain and express a heterologous hypophosphite / 2-oxoglutarate dioxygenase htxa gene, so that reduced phosphorus, such as hypophosphite, can be used as a phosphorus source; and hypophosphite and phosphite fertilizer modifiers are used as phosphorus sources for soil microorganisms to increase carbon storage in deep deposits.

The invention discloses an oxygen-vacancy-rich Nb2O5 material and a preparation method thereof, a negative pole piece and a zinc ion battery, and belongs to the technical field of batteries. The preparation method comprises the following steps: S1, mixing a niobium source, quaternary ammonium base and a solvent to obtain initial gel; s2, heating the initial gel, and carrying out a reaction so as to obtain an Nb2O5 precursor; and S3, calcining the Nb2O5 precursor and hypophosphite in an inactive atmosphere to obtain the oxygen vacancy-enriched Nb2O5 material. The Nb2O5 negative electrode material for the zinc ion battery is developed for the first time, and the oxygen-vacancy-rich Nb2O5 material prepared by adopting a solvothermal and reduction dual-regulation mode has high oxygen vacancy density and good structural stability; the prepared rocking chair type battery structure avoids the problems of dendritic crystals, rusting, hydrogen precipitation and the like caused by a traditional metal zinc negative electrode, and is high in safety and long in cycle life.

The foamed polypropylene resin particles contain an inorganic hypophosphite and a melamine flame retardant. The amount of the inorganic hypophosphite blended in the foamed particles is 0.5% by mass or more, the amount of the melamine-based flame retardant blended in the foamed particles is 0.05% by mass or more, and the total of the amount of the inorganic hypophosphite blended in the foamed particles and the amount of the melamine-based flame retardant blended in the foamed particles is 5% by mass or less. The foamed particles further comprise a first antioxidant comprising a phenolic antioxidant and a second antioxidant comprising a phosphorus-based antioxidant and / or a sulfur-based antioxidant. The total of the blending amount of the first antioxidant and the blending amount of the second antioxidant in the foamed particles is 0.05% by mass or more and 0.6% by mass or less, and the ratio of the blending amount of the second antioxidant to the blending amount of the first antioxidant is 0.5-10.

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.

To provide a method for producing a dialkylphosphinic acid and / or a salt thereof, which can produce a dialkylphosphinic acid and / or a salt thereof in an industrially advantageous manner.SOLUTION: There is provided a method for producing a dialkylphosphinic acid and / or a salt thereof, including: a first step of preparing a phosphorus compound raw material-containing carboxylic acid solution in which hypophosphorous acid and / or hypophosphite is dissolved or suspended in a carboxylic acid; and a second step of adding an olefin and a radical initiator to the phosphorus compound raw material-containing carboxylic acid solution and allowing the reaction to proceed at a reaction temperature of more than 100°C and 200°C or less, and at a reaction pressure of 0.20 MPa or less to obtain a dialkylphosphinic acid and / or a salt thereof.SELECTED DRAWING: None