194 results about "Hypophosphorous acid" patented technology

The invention relates to a base membrane for a composite current collector based on SiO2 nano composite modification and a preparation method of the base membrane. Synergistic modified nano SiO2 is compounded with aluminum hypophosphite, montmorillonite and the like to form modified auxiliary particles, the modified auxiliary particles and PET master batches are subjected to blending extrusion, and meanwhile, the surface of the base membrane is coated with a modified coating containing nano SiO2, so that the composite current collector is obtained. The mechanical property, the thermal stability and the flame retardance of the base film are obviously improved.

The invention discloses a high-elasticity regenerated polyester material for chemical fibers and a preparation method thereof, and relates to the technical field of high polymer material regeneration. The invention discloses a high-elasticity regenerated polyester material for chemical fibers. The composite material is prepared from the following raw materials in parts by weight: 8 to 12 parts of glass fiber, 0.2 to 0.4 part of silane coupling agent KH-550, 4 to 6 parts of absolute ethyl alcohol, 4 to 6 parts of aluminum hypophosphite, 2 to 4 parts of melamine cyanurate, 0.05 to 0.15 part of aryl sodium phosphate, 65 to 75 parts of modified regenerated polyester, 20 to 30 parts of modified bio-based elastomer, 5 to 10 parts of maleic anhydride grafted polyolefin elastomer, 0.3 to 0.8 part of antioxidant and 1 to 2 parts of carbon black master batch. 0.1 to 0.3 part of a silicone lubricant; and 5 to 10 parts of didodecyl dimethyl ammonium chloride. Through supercritical chain extension, nano grafting and gradient crystallization technologies, the mechanical property and elasticity of the regenerated polyester are improved. The modified bio-based elastomer, the flame retardant and the antistatic agent have a synergistic effect, so that the material has high elasticity, flame retardance and antistatic functions. The method is suitable for high-end application in the field of chemical fibers, realizes high-value recycling of waste polyester, and has remarkable environmental protection benefits.

The invention discloses a low-temperature-resistant working electrolyte for a liquid capacitor and a preparation method of the low-temperature-resistant working electrolyte, and relates to the technical field of electrolytes for capacitors. The low-temperature-resistant working electrolyte is prepared from the following raw materials: ethylene glycol, an auxiliary solvent, a solute, ammonium hypophosphite, a synergist, a stabilizer, 1-ethyl-3-methylimidazolium bis (trifluoromethylsulfonyl) imine, boron nitride nanosheets and 2, 2, 2-trifluoroethyl acrylate. According to the invention, while the auxiliary solvent with a specific proportion is added, the synergist capable of improving the conductivity, the cycle life, the low-temperature ion mobility and the low-temperature power density and the 2, 2, 2-trifluoroethyl acrylate capable of further improving the electrochemical performance stability at the low temperature are also introduced, so that the low-temperature electrochemical performance of the lithium ion battery is improved. And a specific preparation method capable of preventing agglomeration and improving the smoothness of an ion conduction path is combined. Therefore, the electrolyte is more excellent in chemical performance at low temperature and wider in application prospect.

The invention belongs to the technical field of flame-retardant materials, and particularly relates to a prismatic aluminum hypophosphite compound as well as a preparation method and application thereof. The prismatic aluminum hypophosphite compound is prepared from aluminum hypophosphite, layered montmorillonite and nano silicon dioxide, and the weight percentage of the layered montmorillonite is 0.043 to 0.087 weight percent and the weight percentage of the nano silicon dioxide is 0.0036 to 0.0181 weight percent based on 100 weight percent of the aluminum hypophosphite; the particle size D10 of the prismatic aluminum hypophosphite compound is 1-3 microns, the particle size D50 of the prismatic aluminum hypophosphite compound is 5-8 microns, the particle size D90 of the prismatic aluminum hypophosphite compound is 10-15 microns, the particle size D97 of the prismatic aluminum hypophosphite compound is smaller than 20 microns, and the prismatic aluminum hypophosphite compound is of a single prismatic crystal structure or a regular structure in which a plurality of prismatic crystals are mutually embedded. The prismatic aluminum hypophosphite compound provided by the invention has a specific morphology and is especially suitable for a polyurethane flame-retardant system.

The invention discloses a halogen-free compound flame retardant and application thereof in an antistatic nylon 66 composite material, and belongs to the technical field of polymer composite materials. The halogen-free compound flame retardant is prepared by compounding 68 parts of an organic aluminum hypophosphite flame retardant, 20 parts of a nitrogen-phosphorus intumescent flame retardant, 10 parts of a two-dimensional layered inorganic substance and 2 parts of a coupling agent through a high-speed mixing and drying process. The halogen-free compound flame retardant is blended with nylon 66, reinforced fibers, an antioxidant and the like, and the composite material is prepared through melt extrusion. According to the compound system, the total dosage of the flame retardant is remarkably reduced, the V-0 flame retardant grade is still achieved under the condition that the thickness is 0.8 mm, and the limit oxygen index exceeds 32%. The composite material has excellent flame retardancy and antistatic property while maintaining good mechanical properties, is suitable for a high glass fiber content system, effectively solves the problems of high flame retardant addition amount, difficult processing, high cost and the like in the prior art, and has the advantages of simple process and excellent comprehensive performance.

The invention belongs to the technical field of chemical modification of natural polymer materials, and particularly relates to a modified cellulose adhesive and a preparation method thereof. The modified cellulose adhesive is prepared from the following components in parts by weight: 50 to 70 parts of modified cellulose-based emulsion, 10 to 20 parts of VAE (Vinyl Acetate Ethylene) composite emulsion, 5 to 8 parts of rosin water emulsion, 3 to 8 parts of cross-linking agent and 2 to 5 parts of plasticizer, the modified cellulose is obtained by grafting an epoxy hypophosphite compound and a fluorine-containing pentaphenyl alkynyl dicarboxylic acid compound with a nano cellulose solution; according to the prepared modified cellulose adhesive, targeted improvement of waterproofness, durability and bonding strength is achieved through molecular design.

This case involves a base film for a composite current collector based on SiO2 nanocomposite modification and its preparation method. The present invention forms modified auxiliary particles by synergistically modifying nano-SiO2 with aluminum hypophosphite, montmorillonite, etc., and extrudes them together with PET masterbatch. At the same time, a modified coating containing nano-SiO2 is coated on the surface of the base film, which significantly improves the mechanical properties, thermal stability and flame retardancy of the base film.

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 belongs to the technical field of synthetic ester, and particularly relates to a preparation method of fatty acid pentaerythritol ester base oil, which comprises the following steps: carrying out esterification reaction on pentaerythritol and fatty acid in the presence of a catalyst and a color retention agent, and carrying out post-treatment to obtain the fatty acid pentaerythritol ester base oil, the catalyst comprises at least one of stannous octoate, stannous oxalate, stannous oxide, tetrabutyl titanate, isopropyl titanate and sodium hydrogen sulfate; the color retention agent comprises at least one of sodium hypophosphite, hypophosphorous acid, activated carbon and sodium sulfite. The color retention agent sodium hypophosphite is matched with the specific catalyst such as stannous oxalate, so that the petroleum color number of the produced fatty acid pentaerythritol ester base oil is smaller, and meanwhile, the esterification reaction time is shorter.

The invention relates to the technical field of silicone rubber, in particular to high-temperature-resistant flame-retardant silicone rubber, a preparation method thereof and a cable, the high-temperature-resistant flame-retardant silicone rubber comprises a gradient layer material composed of a surface layer material, a transition layer material and a core layer material, and the surface layer material comprises methyl vinyl silicone rubber, superfine furnace black, calcium stannate, polyacrylonitrile aerogel and a flame-retardant premix; the transition layer material comprises methyl vinyl silicone rubber, superfine furnace carbon black, spandex fibers, polyarylester, calcium stannate and a flame-retardant premix; the core layer material is prepared from methyl vinyl silicone rubber, superfine furnace black, aramid fiber, polyarylester, phthalonitrile resin and 2-mercaptobenzothiazole zinc salt; wherein the flame-retardant premix is prepared from hydroquinone bis (diphenyl) phosphate, phenyl ethyl aluminum phosphinate and zinc hypophosphite according to the weight ratio of (6 to 10): (2 to 4): (1 to 3); the problems that an existing material is prone to aging in an extreme environment, the flame retardant effect is poor, and the mechanical property is degraded are effectively solved.

The invention relates to the technical field of coatings, and discloses a modified epoxy heat-resistant flame-retardant coating and a preparation method thereof.The preparation method comprises the steps that flame-retardant modified halloysite nanotubes, deionized water, epoxy resin, boron phenolic resin, a defoaming agent and a flatting agent are mixed to be uniform and discharged, and the modified epoxy heat-resistant flame-retardant coating is obtained. Diethyl hypophosphorous acid ethylene oxide methyl ester and boric acid modified halloysite nanotubes react to obtain flame-retardant modified halloysite nanotubes, and the halloysite nanotubes and the organic flame retardant diethyl hypophosphorous acid ethylene oxide methyl ester have a synergistic effect, so that agglomeration of the halloysite nanotubes is avoided, migration of a small-molecule organic flame retardant is avoided, and the flame retardance of the halloysite nanotubes is improved. The boron phenolic resin, the flame-retardant modified halloysite nanotubes and the epoxy resin form a three-dimensional cross-linked thermosetting network structure, so that the hardness, wear resistance and impact resistance of the coating can be improved, and the obtained coating has excellent flame retardance and heat resistance.

The invention is suitable for the technical field of MCA, and provides an MCA / PA6 flame-retardant composite material and a preparation method thereof. Comprising the following components in parts by weight: 50-60 parts of MCA, 15-20 parts of PA6, 15-25 parts of long glass fiber, 3-8 parts of metal hydroxide, 0.5-1.5 parts of titanium dioxide, 0.3-0.6 part of an antioxidant, 1-2 parts of nano silicon dioxide, 1-3 parts of zinc molybdate, 2-5 parts of aluminum hypophosphite, 1-2 parts of silicone resin, 0.5-1 part of carbodiimide and 5-8 parts of a toughening agent. The MCA / PA6 flame-retardant composite material disclosed by the invention combines the flame-retardant property of MCA and the excellent physical property of PA6, so that the flame-retardant property of the material is remarkably improved, and meanwhile, the original characteristics of light weight, good toughness, chemical resistance, good durability and the like of PA6 are maintained. By adding the long glass fiber, the metal hydroxide, the titanium dioxide, the antioxidant, the nano silicon dioxide, the zinc molybdate, the aluminum hypophosphite, the silicone resin, the carbodiimide, the flexibilizer and other components, the strength, the heat resistance and the flame retardant effect of the composite material are further enhanced.

The invention provides an organic hypophosphite flame retardant as shown in a formula (I). Compared with the prior art, the flame retardant provided by the invention contains aryl, is high in stability, relatively high in phosphorus content and relatively high in flame retardance, can be used for flame retardance of various high polymer materials such as polyurethane, epoxy resin and unsaturated polyester, and can endow the polyurethane material with good flame-retardant stability and good mechanical properties especially when being applied to polyurethane.

The invention belongs to the technical field of aluminum hypophosphite preparation, and particularly relates to a method for targeted optimization of the particle size of an aluminum hypophosphite flame retardant by using a crystal modifier, and the method comprises the following steps: S1, adding sodium hypophosphite into deionized water, and dissolving to prepare a 1.5 mol / L sodium hypophosphite solution; s2, aluminum sulfate octadecahydrate is added into deionized water to be dissolved, and a 0.3 mol / L aluminum sulfate solution is prepared; and S3, mixing the sodium hypophosphite solution and the aluminum sulfate solution, then adding an aqueous solution of an acid regulator, controlling the pH value of the solution through the acid regulator, then adding a crystal modifier, oscillating and uniformly mixing, then putting into a drying oven for reaction, and after the reaction is finished, centrifuging and washing to obtain an aluminum hypophosphite product.

A flame-retardant nylon material and a preparation method therefor. The components of a flame retardant in the flame-retardant nylon material comprise a mixture of aluminum diisobutyl hypophosphite and brominated polystyrene. The technical solution overcomes the problems of insufficient flame retardant properties and poor mechanical properties of existing flame retardants when added to plastics in the prior art.

The invention relates to the technical field of polyester synthesis, and discloses flame-retardant anti-dripping polyester and a preparation method thereof. Synthetic monomers of the flame-retardant anti-dripping polyester comprise terephthalic acid, ethylene glycol, a flame retardant a and a flame retardant b, the flame retardant a is 2-carboxyethyl phenyl hypophosphorous acid, and the flame retardant b is [(6-oxo-6H-dibenzo [C, E] [1, 2] oxophosphahexane-6-yl) methyl] succinic acid and / or 2-(diphenyl phosphoryl methyl) succinic acid. According to the invention, the specific flame retardant a and flame retardant b are matched for use and can play roles in an initial combustion stage and a sustained combustion stage respectively, so that the polyester can have better flame retardance and molten drop resistance.

The invention discloses a polyolefin cable material for an energy storage cable and a preparation method thereof, and relates to the technical field of cable materials, the polyolefin cable material comprises the following preparation raw materials by mass: 30-55 parts of matrix resin, 40-70 parts of a flame retardant, 2-10 parts of a compatible flexibilizer, 1-8 parts of a smoke suppressant and 1.0-5.0 parts of a processing aid; the flame retardant comprises coated aluminum hypophosphite and ceramic powder; the ceramic powder is mullite powder treated by amino silicon oil, and the coated aluminum hypophosphite is aluminum hypophosphite coated by ammonium polyphosphate and melamine-formaldehyde resin. The preparation method comprises the following steps: S1, preparing the raw materials according to the required ratio, premixing the matrix resin, and thermally mixing the other preparation raw materials to obtain a premix; and S2, carrying out melt blending, extrusion, cooling and grain-sized dicing on the premix to obtain the polyolefin cable material for the energy storage cable. The polyolefin cable material for the energy storage cable has the advantages of being high in toughness and free of molten drops on the basis of being high in flame retardance and low in fuming property.

The invention relates to a double-coordination passivated red-light perovskite quantum dot and a preparation method and application thereof. The preparation method comprises the following steps: preparing a monovalent cation precursor from cesium carbonate, 1-octadecene and oleic acid; preparing a lead source precursor from lead halide, zinc halide, 1-octadecene, diisooctyl hypophosphorous acid and oleylamine; thermally injecting the monovalent cation precursor into the lead source precursor, and cooling to prepare a perovskite quantum dot solution; performing anti-solvent purification on the perovskite quantum dot solution to obtain red light perovskite quantum dots; a process of preparing a double-coordination passivated red light perovskite quantum dot from the red light perovskite quantum dot and taurosulfonamide hydrochloride; the invention also discloses an application of the double-coordination passivated red light perovskite quantum dot prepared by the preparation method in preparation of an electroluminescent diode. The post-treatment passivation operation method is simple and convenient, and the quantum dot treated by the double-coordination ligand achieves the purpose of preparing the halide perovskite quantum dot with excellent optical performance and excellent performance of the prepared electroluminescent diode.

The invention discloses a nitrogen-phosphorus intumescent flame retardant based on a hypophosphorous acid derivative and oligomerization Schiff base as well as a preparation method and application thereof, and relates to the technical field of macromolecular flame-retardant materials. The invention discloses a nitrogen-phosphorus intumescent flame retardant based on a hypophosphorous acid derivative and oligomeric Schiff base. The nitrogen-phosphorus intumescent flame retardant has a structure as shown in a general formula (I), wherein the Schiff base chain segment is an oligomerization Schiff base chain segment formed by condensation of aromatic polyamine and aromatic polyaldehyde and has a linear or hyperbranched structure, m, n and x are positive integers larger than 0, m + n is larger than or equal to 2 and smaller than or equal to 8, and x is larger than or equal to 2 and smaller than or equal to 30. According to the flame retardant provided by the invention, an oligomer structure and an introduced benzene ring structure have good compatibility with a polymer matrix and are not easy to migrate and separate out, so that long-acting flame retardance and mechanical properties of a material can be maintained, expensive DOPO is successfully replaced by hypophosphorous acid which is low in cost and easy to obtain, and a solid foundation is laid for large-scale industrial popularization and application.

The invention discloses a nitrogen / phosphorus co-doped fullerene material and a preparation method and application thereof.The nitrogen / phosphorus co-doped fullerene material is composed of fullerene, melamine and ammonium hypophosphite, the fullerene serves as a carbon skeleton precursor to form a rich pentagonal topological defect structure in the high-temperature pyrolysis process, and the nitrogen / phosphorus co-doped fullerene material is obtained; melamine and ammonium hypophosphite are respectively used as a nitrogen source and a phosphorus source, are decomposed at a high temperature and are uniformly doped with nitrogen and phosphorus atoms in a carbon skeleton. The method comprises the following steps: dissolving fullerene in carbon disulfide, adding melamine, uniformly mixing, heating until the carbon disulfide is completely volatilized, adding an ammonium hypophosphite solution, and pyrolyzing in an inert atmosphere to obtain the nitrogen / phosphorus co-doped fullerene material. The electrocatalyst provided by the invention has a relatively large specific surface area, can provide more active sites, and also can provide higher mass transfer efficiency and HO selectivity due to rich pores and a topological defect structure, so that the oxygen reduction reaction rate can be improved.

This invention discloses a method for synthesizing dialkylphosphinates, belonging to the field of organic synthesis technology. The method uses hypophosphite and haloalkanes as starting materials. First, a hypophosphite is generated through a heated and pressurized reaction under the action of a phase transfer catalyst. The obtained hypophosphite does not require complex purification; it is directly reacted with an olefin under heated and pressurized conditions in the presence of a free radical initiator to obtain the target product, dialkylphosphinate. The method of this invention uses inexpensive and readily available raw materials, has a simple process route, includes only two core reactions, operates under mild conditions, is safe and convenient, produces few and easily treatable byproducts, has a high product yield, and is simple to purify. It is very suitable for large-scale industrial production, providing an economical and efficient synthetic route for the preparation of high-performance halogen-free flame retardants.

The present invention provides a feed composition comprising: a) at least one organic acid and / or at least one salt thereof; and b) a hypophosphorous acid and / or at least one salt thereof, as well as the use of the feed composition for improving animal growth performance and / or improving animal immunity and / or reducing animal mortality.

The invention provides a high-strength, high-temperature-resistant and flame-retardant cable sheath material. The high-strength, high-temperature-resistant and flame-retardant cable sheath material is prepared from the following raw material components in parts by weight: 40-70 parts of matrix resin, 10-30 parts of reinforced fibers, 15-30 parts of a flame retardant, 5-15 parts of an anti-ant agent, 2-8 parts of a compatibilizer, 0.5-5 parts of a processing aid and 2-4 parts of color master batch. The matrix resin comprises at least one of polyamide-imide resin, polyether-ether-ketone or polyurethane resin. The reinforced fibers comprise amino modified carbon fibers and aramid fibers, and the mass ratio of the amino modified carbon fibers to the aramid fibers is 1: (1-3). The flame retardant comprises nano magnesium hydroxide and aluminum hypophosphite, and the mass ratio of the nano magnesium hydroxide to the aluminum hypophosphite is (2: 1)-(3: 1). The invention discloses a cable protection sleeve, and aims to solve the common problems that an existing cable protection sleeve is prone to embrittlement or deformation in extreme weather such as freezing rain and high temperature, novel materials are high in manufacturing cost and difficult to be put into large-scale commercial use, and meanwhile, termites and rodents damage cables.

The application belongs to the technical field of new energy materials and electrochemical catalysis, and provides an oxygen vacancy-rich nitrogen-doped nickel phosphide / cerium oxide composite catalyst, a preparation method and application thereof. A foam nickel is used as a working electrode, a platinum sheet is used as a counter electrode, and a Hg / HgO electrode is used as a reference electrode. In an electrolyte solution containing a nickel salt and a cerium salt, electrodeposition is performed to obtain a precursor. The precursor includes the foam nickel and cerium and nickel deposited on the foam nickel. The precursor is soaked in a tannic acid solution to obtain an impregnated precursor. Ammonium hypophosphite is placed upstream, and the impregnated precursor placed downstream is subjected to phosphorus nitride doping treatment to obtain the oxygen vacancy-rich nitrogen-doped nickel phosphide / cerium oxide composite catalyst. The obtained oxygen vacancy-rich nitrogen-doped nickel phosphide / cerium oxide composite catalyst exhibits excellent electrocatalytic performance for methanol oxidation reaction (MOR) and can be used as a high-efficiency anode catalyst for a direct methanol fuel cell (DMFC).

The invention relates to a flame-retardant TPU (thermoplastic polyurethane) film, which relates to the technical field of high polymer materials and comprises the following components in parts by mass: 50-70 parts of polyurethane master batch, 15-25 parts of compound halogen-free flame retardant, 10-20 parts of flame-retardant filler, 5-8 parts of heat stabilizer, 2-4 parts of lubricant, 1-3 parts of plasticizer and 1-2 parts of antioxidant, the compound halogen-free flame retardant comprises magnesium hydroxide, ammonium polyphosphate and aluminum hypophosphite; the flame-retardant filler comprises carbon black. According to the TPU film, the flame retardant property of the TPU film can be improved, and the TPU film has good tensile property at the same time.

The invention provides a flame-retardant pouring type polyurethane elastomer material for an elevator door change gear and a preparation method of the flame-retardant pouring type polyurethane elastomer material, and belongs to the technical field of flame-retardant pouring type polyurethane elastomers, the flame-retardant pouring type polyurethane elastomer material comprises the following raw materials: 100 parts of polyether polyol, 35-40 parts of isocyanate, 12-15 parts of a chain extender, 20-25 parts of a composite flame retardant, 0.05-0.1 part of a catalyst, and 0.5-1 part of a release agent; the preparation method of the composite flame retardant comprises the following steps: S1, dispersing MMT in deionized water, adding cetyltrimethylammonium bromide (CTAB), grinding and sieving to obtain MMT powder; s2, mixing HPA with the polyurethane prepolymer, then adding polyvinyl alcohol, performing cross-linking and curing to form core-shell microspheres, and performing vacuum drying to obtain HPA microcapsule powder; through nano-montmorillonite organic intercalation modification and hypophosphorous acid microencapsulation, gas phase-condensation phase coordinated flame retardance is achieved, the flame retardance of the material is improved, balance of mechanical properties and flame retardance is achieved by controlling the particle size and proportion of the composite flame retardant, and the requirements of elevator door change gears for high bearing capacity and impact resistance are met.

The invention provides a method for removing copper oxide in situ, which comprises the following steps: spraying a hypophosphorous acid aqueous solution to the surface of the copper oxide, and reacting hypophosphorous acid with the copper oxide to generate cuprous hydride; and heating and decomposing the cuprous hydride to form a copper simple substance in situ. Reductive hypophosphorous acid reacts with copper oxide to generate solid cuprous hydride, the generated cuprous hydride can form a protective layer to prevent copper oxidation inside, and the cuprous hydride is heated to generate elemental copper and hydrogen, so that loss of the copper element is avoided, the depth of the copper column in the groove is kept, the hole phenomenon is reduced, and the service life of the copper column is prolonged. And the yield is improved. In addition, hydrogen generated by thermal decomposition of cuprous hydride is beneficial to reduction of copper oxide in the subsequent annealing treatment process, and the conductivity of the formed metal copper interconnection structure is improved.

The application discloses a preparation method of a supported high-dispersion molybdenum phosphide catalyst, and comprises the following steps: S1, dissolving molybdenum acetylacetonate and ammonium hypophosphite in an aqueous solution of N,N-dimethylformamide to obtain an impregnation solution; S2, immersing a carrier in the impregnation solution, then drying and reducing to obtain a supported molybdenum phosphide catalyst. The hydrogenation activity and the hydrodesulfurization activity of the prepared molybdenum phosphide catalyst are higher than those of MoP catalysts prepared by a temperature programmed reduction method and a molybdenum trioxide reduction method with ammonium hypophosphite, and the molybdenum phosphide catalyst has very high hydrodesulfurization activity on p-benzothiophene.

The application relates to the technical field of flame-retardant materials, and discloses a flame-retardant material and a preparation method thereof. The flame-retardant material comprises the following components by weight: nylon 40-85 parts, diisobutyl aluminum hypophosphite 5-20 parts, brominated polystyrene 5-20 parts, antimony trioxide 1-3 parts, fibers 0-35 parts, and antioxidant 0.2-0.5 parts; and the antimony trioxide is composed of cubic antimony trioxide and rhombic antimony trioxide. The technical scheme solves the problem of poor flame-retardant performance of the flame-retardant material in the related art.