236 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 provides a polymer additive as well as a preparation method and application thereof, and the preparation method comprises the following steps: carrying out free radical reaction on a hypophosphorous acid aqueous solution and an antioxidant with ethylene under the action of an initiator to obtain a diethyl hypophosphorous acid aqueous solution; the diethyl phosphinic acid aqueous solution, sulfuric acid and metal hydroxide are subjected to a reaction, then alkali liquor is added, and diethyl phosphinate slurry with the pH value being 3.8-4.2 is obtained; mixing and stirring the diethyl hypophosphite slurry and a flocculating agent to obtain diethyl hypophosphite flocculate, and then filtering, washing and drying to obtain the polymer additive. Through the design of the preparation method, the polymer additive with a low acid value can be obtained, and when the polymer additive is used as a flame retardant to prepare a polymer material, the precipitation of an auxiliary agent in a high-temperature processing process can be inhibited, and mold scale can be reduced, so that the prepared polymer composition has relatively low content of water boiling precipitates, and the service life of the polymer composition under damp and hot conditions is prolonged.

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 discloses a catalytic carbonized flame-retardant polyolefin nano composite material as well as a preparation process and application thereof, and relates to the technical field of macromolecular flame-retardant materials. The composite material comprises the following components: a polyolefin matrix, a metal organic framework, aluminum hypophosphite, transition metal nickel, and mercaptan and alkene monomers used for a dynamic mercaptan-alkene click reaction. According to the present invention, the three-time combination flame retardation effect of physical barrier-chemical quenching-pyrolysis gas dilution is achieved, when the fire occurs, the staged catalysis mechanism can accurately respond to different temperature stages, and the nickel ions trigger the polyolefin pre-crosslinking at the temperature of 200-250 DEG C to form the three-dimensional network so as to construct the physical barrier so as to achieve the fire retardation effect; aluminum hypophosphite at the temperature of 300 DEG C or above is pyrolyzed to release acid gas to etch the shell of the MOFs and release the free radical trapping agent, chemical quenching and pyrolysis gas dilution are carried out, and the good mechanical property of the polyolefin material is kept.

The invention relates to the technical field of tire rubber manufacturing, and discloses a tread rubber composition containing modified lignin and a mixing method thereof, and the rubber composition is added with the modified lignin. The modified lignin is water-soluble lignin obtained by modifying lignin by grafting citric acid groups. Citric acid is adopted to modify lignin, a citric acid group is grafted on a lignin group under the catalytic action of sodium hypophosphite to enhance the hydrophilicity of the lignin group, wet mixing is combined, the dispersity of the lignin in rubber is effectively improved, the rolling resistance of the rubber composition is reduced, meanwhile, the added lignin can enhance the strength of a rubber network, and the rolling resistance of the rubber composition is reduced. The tensile property of the rubber is improved.

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 discloses a phosphorus-silicon type Schiff base derivative flame retardant and a preparation method and application thereof.The preparation method comprises the steps that salicylaldehyde and 1, 3-bis (3-aminopropyl)-1, 1, 3, 3-tetramethyldisiloxane react to obtain silicon-containing Schiff base, then P-H on hypophosphorous acid substances and-C = N-on the silicon-containing Schiff base are subjected to an addition reaction, and the phosphorus-silicon type Schiff base derivative flame retardant is obtained. The phosphorus-silicon type Schiff base derivative flame retardant is prepared. The flame retardant contains a plurality of groups such as-OH,-NH-and the like, can achieve molecular-level dispersion in a high polymer material, and plays an efficient flame-retardant role. The flame retardant has a gas-phase and condensed-phase dual-phase flame retardant effect: in the gas phase, the effects of dilution and free radical capture are exerted; and in a condensed phase, char formation can be promoted and a barrier effect can be exerted. In addition, due to the existence of organic silicon, a compact carbon layer with a specific-Si-O-bond or-Si-C-bond of siloxane can be generated during combustion, the protection effect of oxygen isolation and heat insulation is achieved, and the condensed phase flame retardant effect is enhanced. The phosphorus-silicon type Schiff base derivative flame retardant has a wide application prospect and can be applied to flame-retardant modification of polyurethane and epoxy resin.

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 provides a polymer additive, a preparation method thereof and a polymer composition containing the polymer additive, and the preparation method comprises the following steps: carrying out free radical reaction on a hypophosphite aqueous solution and an antioxidant with ethylene in the presence of an initiator to obtain a diethyl phosphinate aqueous solution; mixing the diethyl phosphinate aqueous solution, the metal salt aqueous solution and the alkali liquor, and reacting under the condition that the pH value is 3.5-3.8 to obtain diethyl phosphinate metal salt slurry; mixing and stirring the diethyl hypophosphorous acid metal salt slurry and a flocculating agent to obtain a diethyl hypophosphorous acid metal salt flocculate, filtering, washing and drying to obtain the polymer additive. Through the design of the preparation method, the polymer additive with low acid value and high thermal stability can be obtained, the polymer additive is used as a flame retardant to prepare a polymer composition, injection mold scale can be reduced, the polymer composition has fewer water boiling precipitates, and the stability of the polymer composition under damp and hot conditions is improved.

The invention relates to the technical field of ABS resin, and discloses modified ABS resin and a preparation method thereof.The modified ABS resin adopts a phosphorus-nitrogen flame retardant compounded by aluminum hypophosphite and melamine polyphosphate, dispersity is improved through surface modification of a silane coupling agent, efficient flame retardance is achieved, molten drops are inhibited, the influence on mechanical performance is reduced, and the flame retardance is improved. The low-temperature impact resistance is improved through the organic silicon modified acrylate core-shell toughening agent, meanwhile, rigidity loss is avoided, the tensile strength (larger than or equal to 45 MPa) and toughness are balanced, and the synergistic flame retardance and mechanical performance are optimized; nano titanium dioxide is subjected to double coating of stearic acid and silane and ultraviolet pretreatment, so that dispersity and ultraviolet shielding performance (UVA transmittance lt; the strength retention rate of the material is larger than or equal to 90% after the material is subjected to QUV aging for 1000 hours in combination with the hindered amine light stabilizer (HALS), the crystal structure is optimized through the rare earth beta nucleating agent, the thermal stability and surface smoothness of the material are further improved, and multifunctional compounding and weather resistance are improved.

The invention relates to the technical field of tire rubber manufacturing, and discloses a rubber composition containing modified lignin and a mixing method thereof, and the rubber composition is added with the modified lignin. The modified lignin is water-soluble lignin obtained by modifying lignin by grafting citric acid groups. Citric acid is adopted to modify lignin, a citric acid group is grafted on a lignin group under the catalytic action of sodium hypophosphite to enhance the hydrophilicity of the lignin group, and wet mixing is combined to effectively improve the dispersity of the lignin in rubber and reduce the rolling resistance of the rubber composition, and meanwhile, the added lignin can enhance the strength of a rubber network, so that the rolling resistance of the rubber composition is improved. The tensile property of the rubber is improved.

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 an ionic liquid modified nano calcium carbonate / dipropyl aluminum hypophosphite flame-retardant nylon material, and relates to the technical field of flame-retardant materials, the ionic liquid modified nano calcium carbonate / dipropyl aluminum hypophosphite flame-retardant nylon material comprises, by weight, 68-85 parts of nylon 6 slices, 0.1-0.5 part of an antioxidant, 0.2-1 part of a lubricant, 10-25 parts of dipropyl aluminum hypophosphite, and 5-10 parts of ionic liquid modified nano calcium carbonate; wherein the ionic liquid modified nano calcium carbonate is obtained by mixing, dispersing and drying nano calcium carbonate and ionic liquid; the ionic liquid is prepared from 1-methyl-1H-imidazole, decane chloride and NaBF4 (NaBF4). The environment-friendly flame-retardant cable material has the effects of environment friendliness, efficient flame retardance and low cost.

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.

The invention relates to the technical field of flame-retardant materials, and provides a flame-retardant high polymer material and a preparation method thereof. The flame-retardant high polymer material comprises the following components in parts by weight: 50-80 parts of a high polymer material and 3-45 parts of a flame retardant, the flame retardant is prepared from the following components in parts by weight: 1 to 25 parts of diisobutyl aluminum hypophosphite, 1 to 15 parts of bromotriazine and 1 to 5 parts of antimony flame retardant. According to the technical scheme, the problems of insufficient flame retardance and lower strength of a high polymer material in the related technology are solved.

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.