499 results about "Pyrophosphate" patented technology

The invention relates to a preparation method of a nickel ion doped modified ferric sodium pyrophosphate positive electrode material, and belongs to the technical field of sodium ion battery positive electrode materials. The nickel ion doped modified ferric sodium pyrophosphate positive electrode material is prepared by adopting an integrated process system of liquid phase uniform mixing, spray granulation and precise segmented calcination. According to the process system, atomic-scale uniform doping of nickel ions and a specific microstructure of a precursor are realized through spray drying, and a plurality of inherent key technical problems of low electronic conductivity, low ion diffusion rate, impurity phase generation and the like of an NFPP material are solved together through a synergistic effect with a subsequent calcining process; furthermore, the discharge capacity of the ferric sodium phosphate pyrophosphate composite material at high rate is improved, so that the battery has relatively high cycling stability.

The invention discloses application of iron ruthenium nano-enzyme in preparation of nucleic acid detection products, and belongs to the technical field of biological detection and nano-materials. The RIN has stable peroxidase-like (POD) activity, and can catalyze a chromogenic reaction between 3, 3 ', 5, 5'-tetramethyl benzidine (TMB) and hydrogen peroxide (H2O2). The catalytic activity of the nano-enzyme can be selectively inhibited by pyrophosphate (PPi) generated in a nucleic acid amplification reaction, so that visual colorimetric analysis on whether target nucleic acid exists or not is realized. In combination with a polymerase chain reaction (PCR) system, the invention constructs a new nucleic acid detection strategy which does not need fluorescence labeling, is simple and convenient to operate and has high sensitivity. Through verification, the system can be widely applied to rapid on-site screening and visual interpretation of related nucleic acid of drug-resistant pathogens (such as ESKAPE flora) and the like, and has a good application prospect.

The invention belongs to the field of biosynthesis, and in particular relates to LBD (Levandanenediol Pyrophosphate) synthase and engineered yeast for producing sclareol. In order to solve the problem that in the prior art, the sclareol biosynthesis yield is generally low, LSLPPs mutant containing at least one mutation of D730L, D374L, N674L or G379M is obtained by performing mutation and optimization on LSLPPs pyrophosphate synthase, and the mutant is used for sclareol synthesis. Meanwhile, in order to solve the problem of genetic instability caused by free plasmid expression of part of saccharomyces cerevisiae strains, a sclareol synthesis pathway is constructed in a yeast genome, and meanwhile, an acetyl coenzyme A synthesis pathway, an MVA pathway and a sclareol synthesis pathway are enhanced; chassis bacteria for synthesizing sclareol are modified in a manner of knocking out part of transcription inhibition factors, and the yield of a 5L fermentation tank reaches 26.11 g / L and is greatly improved compared with the prior art.

The invention provides a uracil production strain and a construction method and application thereof.According to the strain, on an E.coli UR14 genome by means of a CRIPSR / Cas9 gene editing technology, firstly, psuG genes, preTA genes, rutA genes and upp genes are knocked out, so that decomposition of uracil is blocked; then, a uridine phosphorylase gene udp and a pyrimidine-5 '-nucleotide nucleotidase gene ppnN are subjected to overexpression, and synthesis and accumulation of uracil are synergistically enhanced; and finally, overexpression of the ribose phosphate mutase gene pgm further enhances the conversion of a by-product ribose phosphate 1-precursor 5-ribose phosphate 1-pyrophosphate and improves the carbon utilization rate, and the obtained strain has good genetic stability and high fermentation yield, can stably produce uracil, and has wide application prospects.

The embodiment of the invention provides a polyanionic positive electrode material and a preparation method thereof, a positive electrode plate, a secondary battery and an electric device, and belongs to the technical field of secondary batteries. The polyanionic positive electrode material is ferric sodium pyrophosphate, the polyanionic positive electrode material comprises primary particles and secondary spheres formed by the primary particles, and the primary particles comprise primary particles with the particle size Dv50 being d1 and primary particles with the particle size Dv50 being d2, d1gt; d2, the secondary sphere is of a core-shell structure, a core is of a porous structure, and a shell layer is of a compact structure. The polyanionic positive electrode material is relatively high in compaction density, and has the advantages of good cycle performance and good rate capability.

The invention discloses sulfate-erosion-resistant metakaolin-slag-based geopolymer concrete, belongs to the technical field of concrete, and aims to solve the problems that the corrosion resistance of traditional silicate concrete is ineffective and the adaptability of conventional alkali-activated concrete is insufficient in a special environment. The concrete comprises the following components in parts by weight: 60-90 parts of a cementing material, 120-170 parts of aggregate, 15-30 parts of a composite activator, 2-8 parts of a function regulator and the like, the cementing material is prepared from nano TiO2 / KH-550 composite modified metakaolin, slag and silica fume-coal gangue powder-HAP composite powder; the aggregate comprises modified limestone macadam (soaked and dried by a sodium dihydrogen phosphate solution) and river sand; the composite exciting agent comprises water glass, sodium hydroxide, sodium pyrophosphate, propylene glycol and the like; the function regulator comprises superfine fly ash, a naphthalene water reducer, HPMC (Hydroxy Propyl Methyl Cellulose) and boric acid. Through the synergistic effect of the components, the sulfate corrosion resistance, the mechanical property and the environmental adaptation performance of the concrete are improved, and the concrete is suitable for engineering construction under the service environment of high-concentration sulfate and the like.

The invention belongs to the technical field of flame-retardant materials, and particularly relates to modified piperazine pyrophosphate, a composite flame retardant and a preparation method and application of the modified piperazine pyrophosphate and the composite flame retardant. The modified piperazine pyrophosphate provided by the invention is obtained by modifying piperazine pyrophosphate with a modifier; the modifier comprises silicon resin. According to the preparation method, the piperazine pyrophosphate is modified by adopting a specific type of silicon resin as a modifier, and the piperazine pyrophosphate is coated by utilizing a three-dimensional network structure of the silicon resin, so that the hydrophobicity and the flowability of the piperazine pyrophosphate powder can be improved, and the piperazine pyrophosphate powder has good dispersity in a high polymer material; and the paint has good flame retardance, water resistance, acid resistance and alkali resistance.

The present application provides a positive electrode material, a preparation method thereof, a positive electrode sheet, a battery and an electrical apparatus, and relates to the field of batteries. The positive electrode material comprises sodium iron phosphate pyrophosphate and a carbon coating layer covering the surface of same; and the positive electrode material contains an impurity phase sodium ferric phosphate, the mass ratio of the impurity phase sodium ferric phosphate in sodium iron phosphate pyrophosphate being 14% or below. The positive electrode material has a low content of the impurity phase sodium ferric phosphate, such that the initial charging capacity can be effectively improved, and the electrochemical performance of the positive electrode material is effectively improved.

The invention provides a modified ferric sodium phosphate pyrophosphate positive electrode material and a preparation method and application thereof.According to the preparation method, mature sanding, spray drying and calcining processes are adopted, and the ferric sodium phosphate pyrophosphate / carbon positive electrode material with a porous spherical structure and high phase purity is prepared by optimizing the combination of raw materials; and the performance breakthrough of high specific capacity, super-large rate capability and excellent super-large rate cycle performance is realized. The provided preparation method is simple and convenient in technological process, high in controllability and suitable for industrialization, the selected raw materials are wide in source and low in cost, the energy consumption in the technological process is relatively low, and the comprehensive production cost has remarkable advantages; the synthesized ferric sodium pyrophosphate / carbon positive electrode material obtains excellent dynamic performance, electrochemical performance and structural stability at an ultra-large rate at 20 DEG C based on special morphology characteristics and relatively high phase purity.

The invention discloses an environment-friendly halogen-free efficient flame-retardant composition, a flame retardant, a preparation method and application, and relates to the field of flame retardants, and the environment-friendly halogen-free efficient flame-retardant composition specifically comprises piperazine pyrophosphate, melamine cyanurate, organic phosphonate and polytetrafluoroethylene. The flame-retardant efficiency is improved. By introducing the silane coupling agent, the compatibility of the flame-retardant composition and polyolefin is improved, the processability of the flame retardant and a polyolefin substrate is improved, the precipitation of the flame retardant is reduced, and the flame-retardant composition can continuously and stably exist in a double-85 environment for more than 1000 hours without precipitation. The halogen-free flame retardant prepared by the method can reduce the use cost, solves the problem that most of the halogen-free flame retardants of the scorched piperidine system in the market are easy to separate out, is high in universality, and has a better flame-retardant effect in flame retardance of various types of polyolefins such as polypropylene and polyethylene.

The invention provides an electrolyte additive for synergistically regulating and controlling activity and stability of an all-vanadium redox flow battery and application of the electrolyte additive, the electrolyte additive is a composite additive of an organic amino acid compound and inorganic phosphate, the organic amino acid compound is one of aspartic acid, glycine and cysteine, and the inorganic phosphate is one of amino acid, glycine and cysteine. The inorganic phosphate is one or two or more of phosphate, dihydric phosphate, dihydric phosphate, polyphosphate and pyrophosphate, and cations of the inorganic phosphate are one or two or more of potassium, sodium and ammonium salt. The composite additive is used as an electrolyte additive to be added into an all-vanadium redox flow battery electrolyte, so that the vanadium electrolyte can be effectively prevented from generating precipitates at high temperature, the capacity fading in the battery operation process is avoided, and the stable operation of the battery is realized. The preparation process is simple to operate, energy-saving, environment-friendly and low in cost, and stable operation of the electrolyte in the battery can be realized.

The invention relates to the technical field of flame-retardant high polymer materials, in particular to a high-temperature-resistant and high-humidity-resistant flame-retardant polypropylene composite material and a preparation method thereof. The invention provides a high-temperature-resistant and high-humidity-resistant flame-retardant polypropylene composite material. The high-temperature-resistant and high-humidity-resistant flame-retardant polypropylene composite material consists of polypropylene, a mixed silane modified intumescent flame retardant, a flame-retardant aid NOR 116 and a compatilizer According to the invention, bis [3-(trimethoxysilyl) propyl] amine / triacetoxyvinyl silane is mixed to modify an intumescent flame retardant, which is composed of piperazine pyrophosphate as a main flame retardant and melamine polyphosphate, aluminum hypophosphite or aluminum diethylphosphinate as a secondary flame retardant; a plurality of active silicon hydroxyl sites after silane hydrolysis are mixed, and single flame retardants are connected together to form a macromolecular intumescent flame retardant, so that the modified intumescent flame retardant is still difficult to migrate or separate out from a polypropylene matrix even under high-temperature and high-humidity conditions, and the weather resistance of flame-retardant polypropylene is greatly improved.

The invention discloses a rapidly synthesized ferric sodium pyrophosphate electrode material, a preparation method thereof and a positive electrode. Relates to the technical field of batteries. The preparation method comprises the following steps: S1, mixing a sodium source, an iron source, a phosphorus source and a carbon source, adding a preset volume of deionized water, and stirring until the raw materials are completely dissolved to obtain a light yellow transparent solution; s2, adding a preset amount of modified carbon nanotubes into the light yellow transparent solution, and dispersing in an ultrasonic environment to obtain a stable suspension; s3, starting a spray dryer, and collecting yellow green spherical precursor powder from a discharge port; s4, placing the yellow green spherical precursor powder obtained by spray drying in a magnetic boat, and carrying out heat preservation at 300 DEG C in a pure argon environment at a heating rate of 2 DEG C / min for 5 h to obtain black powder; and S5, transferring the black powder into Joule thermal equipment, and reacting for a preset time under a preset condition to obtain a final black powdery product. Through innovative process design and material modification, the core problems of long period, poor conductivity, low tap density and the like in the traditional preparation technology are solved.

The invention relates to the technical field of sodium ion batteries, in particular to a modified ferric sodium pyrophosphate positive electrode material as well as a preparation method and application thereof. The modified ferric sodium pyrophosphate positive electrode material is Na < 4-x > A < x > Fe < 3-y > M < y > (PO4) < 2-z > E < z > (P2O7) w, wherein A is selected from any one or more of alkali metal ions or alkaline earth metal ions of which the ion radius is greater than Na < + >; m is selected from any one or more of transition metal ions; e is selected from any one or more of SiO4 < 4->, SO4 < 2->, BO3 < 3-> or F <->; 0.1 < = x < = 0.3, 0.1 < = y < = 0.3, 0.04 < = z < = 0.1, and the value of w enables positive and negative charges to be balanced. The stability of a crystal structure is optimized through multi-site multi-element doping, the ion / electron conduction efficiency is improved, and the oxidation reduction behavior is regulated and controlled, so that the cycle life, the rate capability and the energy density of the sodium ferric pyrophosphate positive electrode material are comprehensively improved.

The invention discloses a sclareol synthase mutant, a recombinant genetic engineering strain and application of the sclareol synthase mutant, and belongs to the technical field of biology. The sclareol synthase is modified through semi-rational design, the obtained sclareol synthase mutant has good catalytic activity, and the yield of sclareol can be remarkably increased; furthermore, the method is simple. The method comprises the following steps: integrating an HMG1 gene for coding HMG-CoA reductase, an IDI1 gene for coding isopentenyl pyrophosphate isomerase, an SsGGPPS gene for coding geranyl-geranyl pyrophosphate synthase, an SsLPPS gene for coding lybaidan diglycol diphosphate synthase, and an SsGGPPS gene for coding lybaidan diglycol diphosphate synthase; a recombinant genetic engineering strain obtained by the nucleic acid molecule for coding the sclareol synthase mutant can produce sclareol at high yield by taking glucose as a substrate, and has a remarkable industrial application value.

The invention relates to the technical field of batteries, discloses a preparation method of a high-capacity ferric sodium phosphate pyrophosphate positive electrode material, and aims to solve the problems of impurity phase generation, high drying energy consumption, complex process flow and the like caused by element segregation in an existing ferric sodium phosphate pyrophosphate material preparation process. The invention provides a preparation method for improving the capacity of a sodium ferric phosphate pyrophosphate positive electrode material and the sodium ferric phosphate pyrophosphate positive electrode material, and the preparation method comprises the following steps: preferentially grinding an iron source into fine particles, then pouring soluble raw materials into the fine particles, stirring and waiting for solidification, and then directly sintering a solidified precursor. According to the method, the slurry is instantly solidified when being uniformly stirred, fluidity does not exist, the element segregation influence caused by conventional fluidity slurry in the drying process is avoided, the prepared precursor element distribution is more uniform, the phase crystal form is better, the purity is higher, the electrochemical performance is better, and the competitiveness of the material in the low-cost market is effectively improved.

The invention belongs to the technical field of silicon material cleaning, and particularly relates to a silicon material cleaning agent and a preparation method and application thereof. The silicon material cleaning agent provided by the invention comprises the following components in parts by mass: 50-60 parts of water; 15 to 30 parts of an acidic etching solution; 10 to 20 parts of a first chelating agent; 10 to 20 parts of a second chelating agent; 0.5 to 5 parts of a surfactant; 5 to 15 parts of a builder; wherein the first chelating agent is selected from at least one of 1-hydroxyethylidene-1, 1-diphosphonic acid or ethylenediaminetetraacetic acid; the second chelating agent is selected from at least one of citric acid, gluconic acid, tartaric acid, malic acid, sodium citrate, sodium gluconate, potassium pyrophosphate and sodium pyrophosphate. The silicon material cleaning agent is used for silicon material cleaning, various metal ions can be cleaned at a time, the silicon material cleaning efficiency is improved, and the industrial cost is effectively reduced.

A sodium iron phosphate pyrophosphate positive-electrode material and a preparation method thereof, a battery, and an energy storage device are provided. A molar ratio A of sodium element to iron element in the sodium iron phosphate pyrophosphate positive-electrode material of embodiments of the disclosure satisfies 1.36≤A≤1.45.

The invention provides a composite intumescent flame retardant modified polyamide composite material and a preparation method thereof. The flame-retardant nylon 66 and / or nylon 6 composite material is prepared from the following components in parts by weight: 75-85 parts of nylon 66 and / or nylon 6 matrix and 15-25 parts of composite intumescent flame retardant, wherein the composite intumescent flame retardant is prepared from the following components in parts by weight: 30-50 parts of a phytic acid derivative; 20 to 40 parts of melamine pyrophosphate (MPP); 5 to 15 parts of modified nanosheets; and 10-20 parts of a hydrogen bond cross-linking agent. According to the composite intumescent flame retardant modified polyamide composite material disclosed by the invention, the limit oxygen index and the fireproof grade can be remarkably improved under the condition that the addition amount of the composite intumescent flame retardant is low, and the mechanical property of the polyamide material is not influenced.

The invention relates to a sodium ferric phosphate pyrophosphate positive electrode material as well as a preparation method and application thereof, belongs to the technical field of sodium ion batteries, and solves the problems of complex preparation method, low compaction density and relatively low gram volume in the preparation process of sodium ferric phosphate pyrophosphate in the prior art. The ferric sodium pyrophosphate positive electrode material comprises a base material and a coating layer coating the surface of the base material, the molecular formula of the matrix material is Na (4-x) Fe (3-y) Mz (PO4) 2P2O7Na; wherein M comprises Ti, K and Al, N is F, the value range of x is larger than 0 and smaller than or equal to 0.02, the value range of y is larger than 0 and smaller than or equal to 0.1, the value range of z is larger than 0 and smaller than or equal to 0.025, the value range of a is larger than 0 and smaller than or equal to 0.01, and the coating layer is a carbon material. The sodium ferric pyrophosphate positive electrode material disclosed by the invention is high in compaction density.

The invention relates to the technical field of batteries, in particular to a positive electrode precursor and a preparation method thereof, a positive electrode material and a preparation method thereof, and a battery. A positive electrode precursor includes a precursor A of sodium ferric pyrophosphate having a first D50 particle size, a precursor B of sodium ferric pyrophosphate having a second D50 particle size, and a precursor C of sodium ferric pyrophosphate having a third D50 particle size; the first D50 particle size is 15-25 [mu] m, the second D50 particle size is 6-12 [mu] m, and the third D50 particle size is 1-4 [mu] m; the mass ratio of the precursor A to the precursor B to the precursor C is (1-8): (1-3): (1-3). The positive electrode precursor disclosed by the invention has good grain size distribution, can reduce the porosity and improve the stacking density, and can remarkably improve the compaction density and improve the volume energy density of the battery while keeping high specific energy and cycling stability of a positive electrode material.

The invention provides sodium ferric pyrophosphate and a preparation method thereof, and the preparation method comprises the following steps: mixing waste sodium ferric pyrophosphate with carbonate and an iron source to obtain a mixture, and calcining the mixture to obtain a calcined material; washing and filtering the calcined material to obtain a first filter residue and a first filtrate; performing impurity removal, concentration and crystallization on the first filtrate to obtain sodium carbonate; the first filter residues are subjected to acid pickling and filtering treatment, and second filtrate is obtained; adding phosphate and a pH regulator into the second filtrate, and heating for reaction to obtain mixed slurry; filtering the mixed slurry to obtain second filter residues, and sequentially drying, screening and deironing the second filter residues to obtain iron hydrogen phosphate; the preparation method comprises the following steps: mixing sodium carbonate with ferric hydrogen phosphate, then adding a doping agent, an auxiliary agent and a carbon source, and grinding and calcining to obtain the ferric sodium pyrophosphate. According to the method, high-purity sodium carbonate and iron hydrogen phosphate can be recycled, then pyrophosphate ferric sodium phosphate is prepared, and the pyrophosphate ferric sodium phosphate is good in particle dispersity, high in sphericity degree and high in capacity.

The invention provides a Se anion-doped ferric phosphate pyrophosphate / carbon positive electrode active material and a preparation method and application thereof, and relates to the technical field of electrochemical energy storage device positive electrode active materials, the positive electrode active material comprises a ferric phosphate pyrophosphate base material and a carbon coating layer, in the crystal structure of the base material, part of O is partially replaced by Se, and the general formula of the base material is Na4Fe3 (PO4) 2 (P2O7-xSex), x is less than or equal to 1.0; o < 2-> is partially replaced by Se < 2-> in a crystal structure of a matrix material to construct a Se-doped solid solution, so that an electron energy band structure of the material is regulated and controlled; due to introduction of Se, the band gap of the material can be remarkably reduced, the electron conductivity can be improved, local lattice distortion can be caused, a Na < + > diffusion channel can be widened, and the ion migration capability can be improved; the material keeps a complete main phase structure, electron and ion transmission is synergistically optimized, and the rate capability is remarkably improved.

The invention discloses an ABS (Acrylonitrile Butadiene Styrene) composite material and a preparation method thereof, and belongs to the technical field of high polymer materials, and the ABS composite material comprises the following raw materials in parts by weight: 41-70 parts of ABS resin, 14-24 parts of a flame retardant, 4-10 parts of modified basalt fiber, 10-20 parts of mint fiber antibacterial master batch and 2.2-6 parts of other auxiliaries. According to the flame retardant, the brominated flame retardant, the antimony trioxide and the piperazine pyrophosphate are compounded and have a good synergistic effect on improving the flame retardance, and the modified basalt fibers can improve the screw torque of the material, avoid the screw cracking problem and improve the flame retardance of the material at the same time. In addition, the mint fiber antibacterial master batch is adopted, so that bacterium breeding can be effectively inhibited, and the antibacterial property of the ABS material is improved.

The application provides a preparation method of a precursor pre-adsorption sodium-supplemented sodium iron phosphate pyrophosphate positive electrode material, uses hydrated iron phosphate as a precursor, and places the precursor in a sodium salt of an organic weak acid sodium supplement solution for impregnation adsorption, and after drying, is mixed with a sodium source, a phosphoric acid source, a pyrophosphoric acid source and a carbon source, and is sintered in an inert atmosphere to obtain a pre-sodium-supplemented Na4Fe3(PO4)2P2O7 / C material. The application also provides a sodium iron phosphate pyrophosphate positive electrode material prepared by using the above method, and a sodium ion battery comprising the material. By impregnating and adsorbing the sodium salt of the organic weak acid sodium supplement on the industrial precursor of the sodium iron phosphate pyrophosphate, the nanoscale dispersion of the sodium supplement is achieved, the toxicity and high gas production of the traditional sodium supplement are avoided from the root, the process is adapted to the existing industrial production line, the first coulomb efficiency and the cycle stability of the sodium iron phosphate pyrophosphate positive electrode material are effectively improved, and the industrial application is promoted.

The invention discloses a method for treating a metal surface through ethylene glycol butyl ether after a fire disaster. The treatment method comprises the following steps that modified ethylene glycol butyl ether is prepared; sequentially adding modified ethylene glycol butyl ether serving as a main chemical solution into the reaction kettle according to the quantitative percentage, and carrying out mixed reaction; standing the mixed chemical solution in the step S2 for 10-20 minutes, and adding water to dilute the mixed solution according to the remaining percentage of the volume of the reaction kettle; the ethylene glycol butyl ether is modified and serves as a main component of the cleaning solution, the sodium phosphate, the epichlorohydrin, the sodium pyrophosphate and the trichloroethylene are mixed according to a proper proportion, a proper amount of water is added for dilution, and the cleaning solution is obtained. Dirt formed by fire disasters on the metal surface can be effectively removed, and metal objects cannot be damaged.

The invention discloses a method for preparing a copper-nickel alloy for a solid-state battery through an alkaline system, and belongs to the technical field of solid-state batteries. A pyrophosphate aqueous solution system is used as an electrolyte, and the copper-nickel alloy is prepared through an electro-deposition method; the pyrophosphate aqueous solution system comprises the following components: raw materials of copper pyrophosphate and nickel chloride, a main complexing agent of potassium pyrophosphate, an auxiliary complexing agent of ethylenediaminetetraacetic acid or potassium sodium tartrate, a brightener and an additive. The components and thickness of the alloy are adjusted by changing the metal ion concentration, the input amount of the complexing agent and the like and changing the technological parameters (pH, current density, electrodeposition time and the like), the copper-nickel alloy with the tensile strength reaching 1012.70 MPa, the elongation reaching 5.27% and the nickel content being 8.93% can be prepared, the corrosion resistance is excellent, the coating thickness is uniform, electrodeposition can be conducted at the normal temperature, and the copper-nickel alloy can be used for preparing the copper-nickel alloy with the tensile strength reaching 1012.70 MPa, the elongation reaching 5.27% and the nickel content reaching 8.93%. Therefore, the method is suitable for large-scale industrial production.

The invention relates to the technical field of sodium-ion batteries, and discloses a Ni and Bi co-doped carbon-coated ferric sodium pyrophosphate material, a positive pole piece, a sodium-ion battery and electric equipment. The molecular formula of the ferric sodium pyrophosphate material is 0 < x < = 1, and 0 < y < = 1. According to the iron-site double-doped carbon-coated ferric pyrophosphate sodium material provided by the invention, the iron site part is respectively substituted by nickel and bismuth, the Ni and Bi co-doped carbon-coated ferric pyrophosphate sodium material is synthesized by adopting a high-temperature solid-phase method, the preparation process is simple and small, the equipment cost and energy consumption are greatly reduced, and the generation of inactive NaFePO4 can be reduced. The sodium-ion battery prepared by using the prepared ferric sodium pyrophosphate material as a positive electrode material is good in conductivity, large in specific capacity, high in rate characteristic and long in cycle life, and the inherent defects of the ferric sodium pyrophosphate are overcome.

The invention discloses a formula and a preparation method of a glutinous rice sausage. The preparation method comprises the following steps: stir-frying glutinous rice and salted meat; the stir-fried glutinous rice comprises glutinous rice, fried lard oil, minced garlic, trehalose, refined salt and monosodium glutamate; the salted meat comprises pork, chopped salted fat dices, water, white granulated sugar, refined salt, monosodium glutamate, sodium tripolyphosphate, sodium pyrophosphate and auxiliary materials; the preparation of the stir-fried glutinous rice comprises hot frying and cold frying. The flavor of the glutinous rice sausages is remarkably improved, the glutinous rice in the sausages absorbs grease of the stuffing, particles are full, the taste is fragrant, sweet, soft and glutinous, and the overall flavor is richer and more harmonious.

The invention discloses a preparation method of a water-resistant and melting-resistant sodium silicate-based fireproof coating, and belongs to the technical field of preparation of fireproof materials and inorganic-organic hybrid coatings. The method comprises the following steps: (1) reacting isophorone diisocyanate with polypropylene glycol to prepare an isocyanate-terminated polyurethane prepolymer; (2) mixing the polyurethane prepolymer with piperazine pyrophosphate to obtain a component A; (3) mixing a sodium silicate aqueous solution with melamine to obtain a component B; and (4) mixing and curing the component A and the component B in proportion to obtain the coating. According to the invention, an isocyanate group in a polyurethane prepolymer and a sodium silicate aqueous solution are subjected to an in-situ chemical reaction, an organic hydrophobic network is constructed on the surface of an inorganic phase, and the water resistance of the coating is remarkably improved. Meanwhile, piperazine pyrophosphate and melamine form an intumescent flame-retardant system, the intumescent flame-retardant system and sodium silicate are synergistically promoted to form a compact and stable intumescent layer at high temperature, and the problems that a traditional water glass coating easily absorbs moisture and melts and flows at high temperature are effectively solved. The method is simple and controllable in process, and the prepared coating has excellent water resistance, fire resistance and heat insulation performance.