340 results about "Mischmetal" patented technology

The invention relates to the technical field of rare earth metal electrolysis cathode protection coatings, in particular to a high-temperature-corrosion-resistant yttrium-stabilized zirconia gradient coating on the surface of a tungsten cathode. A metallurgically bonded strong bonding bottom layer is constructed on a tungsten substrate through surface pretreatment and reactive sintering, then an atmosphere plasma technology is adopted to spray a creep-resistant gradient layer with continuous components to buffer thermal stress, and finally a sol-gel technology is utilized to construct an extremely compact corrosion-resistant surface layer in a superposition mode. The high-temperature-corrosion-resistant yttrium-stabilized zirconia gradient coating is constructed through a multi-scale and multi-mechanism synergistic effect, the problems that a tungsten cathode coating is insufficient in binding force and poor in thermal shock resistance are fundamentally solved, molten salt permeation can be blocked, and the service life of a tungsten cathode in a severe environment is remarkably prolonged.

The invention relates to the technical field of rare earth metal hydrometallurgy, in particular to a rare earth molten salt electrolysis truss type multifunctional metal output system and a control method.The system comprises a main body supporting and moving frame, an integrated function execution module set, a bottom cleaning function module, an electrolytic bath station unit and an intelligent control system; wherein the integrated function execution module group, the bottom cleaning function module, the electrolytic tank station unit and the intelligent control system are respectively arranged in the main body support and motion frame, and the main body support and motion frame is arranged in a gantry truss structure; the four functions of pot lifting, casting, cooling and bottom cleaning in rare earth electrolysis are integrated on the integrated bearing platform of the same gantry truss type rack, and through multi-sensing information fusion and intelligent control, the system can automatically complete the whole process operation of crucible extraction, molten metal casting, cooling forming and electrolytic bath bottom cleaning; and the exposure of workers in high-temperature and high-risk environments is obviously reduced, and the production safety and efficiency are improved.

The invention discloses a preparation method and application of a rare earth element doped ruthenium oxide catalyst, and the preparation method comprises the following steps: (1) dissolving a rare earth metal salt, a ruthenium metal salt, dopamine hydrochloride and a Tris-HCl buffer agent in water to obtain a mixed solution, and carrying out in-situ polymerization reaction, solid-liquid separation and drying to obtain a powder precursor; and (2) carrying out high-temperature calcination on the powder precursor obtained in the step (1) to obtain the rare earth doped ruthenium oxide catalyst. Rare earth metal salt and ruthenium salt precursors are dispersed on an in-situ constructed porous carbon substrate, and the rare earth element doped ruthenium oxide nanosheet is generated by oxidation under a high-temperature condition through a self-sacrifice template method. The method has the characteristics of high efficiency and no pollution. The rare earth element doped ruthenium oxide disclosed by the invention is used as a catalyst for the anodic reaction of the acidic electrolyzed water, and shows excellent catalytic activity and wide application prospect.

The invention relates to the technical field of catalysts, in particular to a composite catalyst for nitrous oxide decomposition and a preparation method thereof.The composite catalyst is of a three-dimensional flower-shaped structure and comprises a composite carrier and active metal loaded on the composite carrier; the composite carrier is composed of a modification additive and a carrier oxide; the performance additive is composed of alkali metal oxide and rare earth metal oxide; the carrier oxide is selected from one of aluminum oxide, titanium dioxide and silicon dioxide; the active metal comprises cobalt oxide and vanadium oxide. The multi-metal catalyst has the advantages that the multi-metal catalyst with a three-dimensional flower-shaped structure is formed by loading cobalt and vanadium active metals on aluminum oxide and under the synergistic effect of alkali metal and rare earth metal, so that the stability and durability of the catalyst in a high-temperature environment are remarkably improved.

The invention discloses a preparation method of a high-strength aluminum oxide ceramic substrate, which comprises the following steps: firstly, modifying aluminum oxide powder by a liquid phase method, and coating a layer of nano magnesium oxide on the surface of the aluminum oxide powder; then carrying out ball milling treatment on the modified powder, rare earth metal oxide, metal oxide, an organic solvent, a binder, a plasticizer and a dispersing agent together, then carrying out defoaming, tape casting, drying and laminated hot pressing to obtain a ceramic green body, and finally carrying out sintering molding in an air atmosphere to obtain the ceramic. The nano magnesium oxide active coating layer constructed in situ and the added exogenous sintering aid act together, so that uniform growth of isometric crystals is promoted, development of a small amount of dominant oriented grains is directionally induced, a composite enhanced microstructure is formed, atomic scale super-uniform distribution and optimal interface combination of the nano magnesium oxide and the exogenous sintering aid are realized, and the nano magnesium oxide / exogenous sintering aid composite material is prepared. The bending strength of the obtained alumina ceramic can reach up to 881 MPa.

The invention provides a treatment method for synergistically enhancing the comprehensive performance of a neodymium-iron-boron magnet, and belongs to the technical field of magnetic materials. According to the method, a heavy rare earth layer and a corrosion-resistant metal layer such as copper, nickel and cobalt for promoting grain boundary diffusion of heavy rare earth are respectively deposited on the surface of the neodymium-iron-boron magnet by adopting a multi-layer electroplating method, the coercivity of the neodymium-iron-boron magnet is enhanced through grain boundary diffusion, and the corrosion resistance of the magnet is enhanced through a nickel-cobalt coating. The treatment method comprises the following steps: carrying out electrochemical deposition on the neodymium-iron-boron magnet in a heavy rare earth metal plating solution, and then respectively electroplating a copper plating layer and a nickel-cobalt plating layer to obtain a heavy rare earth-containing plating layer with strong corrosion resistance and good plating film binding force; the neodymium-iron-boron magnet containing the heavy rare earth coating is subjected to heat treatment, and the coercive force of the magnet is improved through heavy rare earth grain boundary diffusion. The neodymium iron boron grain boundary diffusion process and the surface corrosion prevention process are subjected to integrated treatment, the technological process of high-performance neodymium iron boron industrial preparation is shortened, and the coercive force and the corrosion resistance of the magnet are comprehensively enhanced.

The present disclosure describes an eco-friendly bio-based process for effectively recovering a rare earth metal from a rare earth metal source, particularly a low-grade phosphate mineral such as monazite, through solvo-chemical extraction.

The invention belongs to the field of electrochemical energy storage, and discloses an electrode suitable for an organic flow battery and a preparation method of the electrode. The electrode comprises a porous electrode substrate and an amino functional group loaded on the surface of a pore channel, and the electrode substrate is prepared by taking mixed powder of noble metal, rare earth metal and titanium alloy as a raw material. A selective laser melting process is adopted to prepare a porous electrode substrate, and then an electrostatic self-assembly process is adopted to load amino functional groups on the surfaces of pore channels. The electrode has a porous structure with a high specific surface area, and can provide sufficient reaction sites for electrochemical reaction. Meanwhile, the loaded amino functional group can enhance the activity and stability of positive and negative electrode electrochemical substances. The electrode base material comprises a noble metal with catalytic activity and a rare earth metal, and an active rare earth oxide layer doped with a noble metal oxide can be formed on the surface of the electrode after printing. According to the electrode, the energy efficiency of the organic flow battery can be improved, and the stable cycle index and the service life are prolonged on the basis of maintaining the energy efficiency.

The invention discloses a heat-resistant aluminum alloy material and a preparation method thereof, and relates to the technical field of metal material metallurgy, and the heat-resistant aluminum alloy material comprises the following components in parts by weight: 78-85 parts of pure aluminum ingot; 4-6 parts of electrolytic copper blocks; 1.5 to 2.5 parts of magnesium ingot; 0.8 to 1.5 parts of zinc particles; 2 to 3.5 parts of metal nickel powder; 0.1 to 0.3 part of titanium-aluminum alloy; 0.05 to 0.15 part of a zirconium-aluminum alloy; 0.08 to 0.2 part of scandium aluminum alloy; 0.05 to 0.12 part of a cerium rare earth metal block; according to the aluminum alloy material disclosed by the invention, the high-temperature performance of the aluminum alloy material is remarkably improved by optimizing the composition proportion of the alloy. Elements such as copper and nickel are added to form a stable strengthening phase, so that the high-temperature strength and the creep resistance are enhanced; due to introduction of rare earth elements cerium and scandium, crystal grains are refined, and the thermal stability of the material is improved; and through compound addition of zirconium and titanium, grain boundary migration at high temperature is further inhibited, the softening phenomenon is effectively delayed, and the material still keeps excellent mechanical properties and oxidation resistance in a long-term high-temperature environment.

The present invention relates to an adsorbent in which a metal-organic framework is filled within the pore space of a carrier and a method of manufacturing the same, as well as a method of recovering rare earth metals from waste permanent magnets using an adsorbent in which a metal-organic framework is filled within the pore space of a carrier.

The present invention relates to a method for manufacturing a grain boundary diffusion material using a rare earth oxide and a method for manufacturing an R-Fe-B-based permanent magnet using the same, whereby an inexpensive grain boundary diffusion material can be manufactured using a rare earth oxide that is less expensive than an expensive rare earth metal. In addition, an R-Fe-B based permanent magnet in which grain boundary diffusion is performed using a grain boundary diffusion material made of a rare earth oxide can exhibit excellent coercive force.

This invention discloses a catalyst for the alkylation of tert-butanol with styrene to prepare tert-butylethylbenzene and ethylbenzene, its preparation method, and its application. The catalyst consists of a support and active components loaded on the support. The active components are oxides of rare earth metals and high-valence oxides of transition metals. The support is H-β zeolite. The mass contents of the oxides of rare earth metals and high-valence oxides of transition metals on the support are 3-5% and 2-4%, respectively. This invention makes a breakthrough in the reaction mechanism by loading rare earth metals and transition metals onto a β-molecular sieve and using tert-butanol and styrene as raw materials for alkylation. This avoids the polymerization of styrene (raw material) and the dimerization of isobutylene (intermediate product), reduces the generation of by-products, and makes the catalytic process controllable.

This application provides a zinc-containing multi-element alloy, its preparation method, a zinc plating method, and metal coated parts, relating to the field of hot-dip galvanizing technology. The chemical composition of the zinc-containing multi-element alloy provided in this application, by weight percentage, includes: 0.005%~0.4% Al, 0.4%~2.0% Ni, 0.1%~0.5% Mn, 0.001%~0.05% Ti, 0.01%~0.1% rare earth metals, and 0.001%~0.05% Si, with the balance being Zn and unavoidable impurities. This application obtains a zinc-containing multi-element alloy by synergistically designing the types and contents of various trace elements such as Al, Ni, Mn, Ti, rare earth elements, and Si. This zinc-containing multi-element alloy achieves a comprehensive effect of improved Ni utilization efficiency, controlled zinc-iron alloy layer growth, and uniform coating structure, thereby significantly improving the corrosion resistance of the coating while reducing its thickness.

The application belongs to the technical field of rare earth metallurgy, and discloses a method for preparing rare earth metal by electrolyzing molten salt. The method comprises the following steps: taking rare earth oxide as electrolytic raw material, and performing electrolysis in molten salt electrolyte under a protective atmosphere; and collecting the deposit after electrolysis, so that the rare earth metal is obtained. Through the synergistic effect of multi-dimensional process, the application successfully constructs an efficient, green and stable rare earth metal electrolysis preparation system. The system completely eliminates carbon pollution, significantly improves the stability of the electrolysis process and the quality of the product, realizes efficient and stable preparation of high-purity rare earth metal, and can meet the stringent requirements of high-end electronics, aerospace, high-performance permanent magnet materials and other fields for ultra-high-purity rare earth products.

The application provides a calcium-based bifunctional material and a preparation method and application thereof, and the preparation method comprises the following steps: mixing a calcium salt solution and an organic template agent, stirring under heating conditions, forming a gel, and then drying and calcining to obtain a calcium carbonate adsorption component; preparing a rare earth metal oxide by using a hydrothermal method, and then loading a transition metal on the rare earth metal oxide by using an impregnation method to obtain a transition metal supported catalytic component; and placing the adsorption component and the catalytic component in a hydrogen-rich atmosphere after physical mixing and calcining to obtain the calcium-based bifunctional material. According to the method, the preparation process of the adsorption component is controlled, the calcium carbonate is first generated by using a sol-gel method and low-temperature calcining, and the calcium carbonate is mixed with the catalytic component and then hydrogen-rich calcining is performed to generate porous calcium oxide, so that the sintering of the calcium oxide in the high-temperature preparation process is avoided; the method has the advantages of simple process, excellent performance, low energy consumption and good industrial application value.

The present application relates to the field of dephosphorization adsorbent, disclose a kind of modified hydrotalcite adsorbent and its preparation method and application, the adsorbent includes hydrotalcite and / or hydrotalcite-like compound with lamellar structure, and modification component;The modification component includes the first metal component modified on the layer of the hydrotalcite and / or hydrotalcite-like compound, and the second metal component modified in the interlayer of the hydrotalcite and / or hydrotalcite-like compound;Wherein, the first metal component is selected from transition metal and / or rare earth metal;The second metal component is selected from at least one of alkali metal.By metal modification in the layer and interlayer of hydrotalcite and / or hydrotalcite-like compound, the selectivity of adsorbent for phosphate in water can be effectively improved, and the phosphorus capacity is high, and has excellent effect in the application of dephosphorization in complex water.

The invention discloses a sintered neodymium-iron-boron permanent magnet with excellent comprehensive performance and a preparation method thereof, and the preparation method comprises the following steps: (1) taking a metal oxide as a sputtering target material, and sputtering a layer of non-rare earth metal oxide on a neodymium-iron-boron sheet to form a first diffusion layer; (2) taking the mixed alloy as a second diffusion source, uniformly mixing absolute ethyl alcohol and PVB (Polyvinyl Butyral) glue, and coating on the first diffusion layer to form a second diffusion layer; the mixed alloy comprises light rare earth, heavy rare earth and high-potential metal; and (3) placing the treated sample in a high-vacuum oxygen-free heat treatment furnace, and performing diffusion heat treatment to obtain the sintered neodymium-iron-boron permanent magnet with excellent comprehensive performance. The double-layer diffusion source is used for grain boundary diffusion, and meanwhile the comprehensive performance such as coercive force, corrosion resistance and resistivity of the magnet is improved.

This invention discloses a rare-earth metal gradient-doped polyanionic cathode material, its preparation method, and its application. The molecular formula of the rare-earth metal gradient-doped polyanionic cathode material is Na. 2+2x‑y RE y Fe 2‑x (SO4)3, in the rare earth metal gradient-doped polyanionic cathode material, rare earth metal elements enter the crystal lattice of the polyanionic cathode material in the form of rare earth metal ions, and the doping content of the rare earth metal ions decreases in a gradient along the direction from the crystal lattice surface to the bulk phase. The polyanionic cathode material is an Alluaudite-type sodium iron sulfate cathode material. This invention effectively solves the kinetic mismatch problem of "fast ions but slow electrons" in rate performance by simultaneously optimizing the electronic structure and sodium ion channels through rare earth doping, significantly improving the structural stability of the material under long-cycle and fast-charge-discharge conditions. Simultaneously, the assembled sodium-ion battery exhibits excellent wide-temperature performance.

The utility model belongs to the field of rare earth metal electrolytic machining, and particularly relates to an electrolytic furnace for preparing rare earth metal, which comprises a furnace body, a driving motor is arranged at the top of the furnace body, the output end of the driving motor penetrates through the furnace body and is connected with a reciprocating screw rod, and the reciprocating screw rod is arranged in a cylindrical cavity in the inner wall of the furnace body and is rotationally connected with the bottom of the cavity; a longitudinal sliding groove is formed in the surface of the barrel-shaped cavity, the surface of the reciprocating lead screw is in threaded connection with a barrel-shaped block matched with the barrel-shaped cavity, and a sliding block sliding in the sliding groove is arranged on the side face of the barrel-shaped block; through the structural design that an elastic scraping strip sleeving the outer wall of a fixing ring is in interference contact with the inner wall of the furnace body, the function of scraping residual materials on the inner wall in the electrolysis process in real time is achieved, and the problems that materials attached to the inner wall of a traditional electrolysis furnace cannot participate in the reaction and are difficult to clean are solved; the high-temperature-resistant silica gel material of the elastic scraping strip and the wave-shaped scraping teeth enhance the scraping effect, so that the materials are ensured to participate in the reaction again, and solidification residues are reduced.

The utility model discloses a kind of hydrated molten salt feeding devices and the system of electrolytic preparation rare earth metal.The hydrated molten salt feeding device includes: melting unit, the melting unit includes melting chamber, and the melting chamber is used to accommodate hydrated salt;Heating unit, the heating unit includes waste heat collection mechanism, heat conduction heating mechanism, circulating pipeline, heat-conducting fluid medium and circulating pump, the waste heat collection mechanism, the heat conduction heating mechanism is communicated through the circulating pipeline, and forms a closed loop, and the heat-conducting fluid medium is filled in the closed loop;Material conveying unit, the material conveying unit is connected with the melting chamber, and is used to transport hydrated molten salt in the melting chamber to electrolytic device.The hydrated molten salt feeding device provided by the utility model heats hydrated molten salt by heating unit using the waste heat of electrolytic cell in high-temperature molten salt electrolysis process, realizes the efficient use of electrolytic cell waste heat.

A method and cascade reactor system for producing elemental rare earth metals and rare earth-aluminum alloys via aluminothermic reduction are disclosed. The method involves combining rare earth oxides or halide salts with aluminum powder, initiating a thermite-type reaction under inert or controlled atmospheric conditions, and recovering the molten metal product. Fluxing agents may be used to enhance slag fluidity and phase separation. The cascade reactor comprises multiple thermite zones with staged ignition, thermal transfer mechanisms, and slag separation interfaces, enabling sequential reduction of mixed feedstocks. The system supports both batch and continuous formats and achieves high recovery yields, reduced aluminum contamination, and compatibility with alloying and post-purification processes. The invention is adaptable to individual rare earth species and mixed oxide concentrates, offering a scalable, energy-efficient, and environmentally favorable route to rare earth metal and alloy production.

The application provides a multi-level hole molybdenum-bismuth composite metal oxide catalyst and a preparation method thereof. 12 Bi 1.5 Fe 1.5 Co5Ce x Gd y K 0.5 O / TiO2, wherein 0 < x <= 1.2 and 0 < y <= 0.3. The catalyst comprises a carrier and a composite metal oxide, the composite metal oxide is dispersed in the carrier, the carrier is a multi-level hole TiO2, and the composite metal oxide is a composite oxide of molybdenum-bismuth-iron-cobalt-potassium and at least two kinds of rare earth metals. The catalyst is prepared by a deposition precipitation method. The multi-level hole molybdenum-bismuth composite metal oxide catalyst prepared by the application has a large specific surface area and contains at least two kinds of rare earth metals, which promotes high dispersion of active components, a synergistic effect between the rare earth metals, an increase in the number of active oxygen species and an increase in the selectivity of the catalyst for selective oxidation products.

The invention belongs to the technical field of tungsten and tungsten products, and particularly relates to a preparation method and application of a rare earth oxide doped tungsten composite material. A tungsten salt solution and a rare earth metal salt solution are dispersed and distributed in a high-temperature environment in a tiny suspension form in an atomization manner and are mixed with each other. Then, at a high temperature, liquid drops formed by mixing are rapidly dried and are subjected to pyrolytic reaction to form tungsten oxide and nano rare earth oxide. In the subsequent reduction reaction, tungsten oxide is reduced into tungsten powder, and the rare earth oxide retains the original components and structure and is uniformly distributed. The invention provides the method capable of efficiently and industrially preparing the uniform rare earth doped tungsten powder in a short process, ammonium paratungstate does not need to be produced, the influence of the genetic effect of ammonium paratungstate is reduced, the process steps are reduced, and the energy utilization rate is increased; the rare earth and the tungsten element are uniformly mixed in a liquid-liquid mixing mode, the tungsten powder uniformly doped with the rare earth is obtained through high-temperature rapid oxidation, and no waste liquid is generated in the production process.

This invention discloses a rare earth molten salt electrolysis system and method. The rare earth molten salt electrolysis system includes a rare earth molten salt electrolysis device, a base, liquid guiding pipes, and a rare earth metal ingot casting device. Multiple bases are arranged in parallel. Each base has multiple receiving tanks. Multiple rare earth molten salt electrolysis devices are used. Each device includes an electrolysis cell body and a tubular cathode. A portion of the tubular cathode extends into the electrolysis cell body, and another portion is located outside the electrolysis cell body. The tubular cathode has a hollow structure. At least a portion of the electrolysis cell body is disposed within the receiving tanks. Multiple liquid guiding pipes are connected to the tubular cathode and the rare earth metal ingot casting device, respectively, for guiding the electrolyzed liquid rare earth metal into the rare earth metal ingot casting device. The rare earth metal ingot casting device is configured to form multiple ingot casting chambers. The rare earth molten salt electrolysis system of this invention can improve electrolysis efficiency.

This utility model belongs to the field of rare earth metal marking technology, specifically relating to a convenient rare earth metal marking fixture, including a base plate and side plates. Both sides of the base plate have inlay holes with threaded components inside. The side plates have threaded posts that mate with the threaded components. The upper surface of the side plates has an L-shaped clamping plate. The base plate has a driving mechanism, and the driving mechanism has a support plate. The L-shaped clamping plate and the support plate form a fixed area for clamping rare earth metal samples. This utility model simplifies the operation process and effectively avoids deviation during marking, thus improving its stability. Furthermore, by using the threaded connections of the side plates to both sides of the base plate, the distance between the two opposing L-shaped clamping plates can be adjusted to accommodate rare earth metal samples of different sizes, improving the versatility of the fixture.

The present invention relates to a method for making an electrode provided with a catalytic coating for electrocatalytic processes, preferably gas evolution electrode, comprising: a- providing a precursor comprising salts of metals, wherein said metals are selected from a group consisting of combinations of one or more noble metal with one or more rare earth metal, b- heating said precursor to a temperature comprised between 300 and 700oC under oxygen or air, thus obtaining a dried powder comprising oxides of said metals, c- preferably, subjecting the dried powder to a process of particle size reduction, d- optionally storing or transferring said dried powder, e- dispersing said dried powder in a liquid thus obtaining a catalytic dispersion, f- applying said catalytic dispersion by a coating technique on a thermally unstable substrate thus forming a coated substrate, g- drying said coated substrate thus forming said electrode provided with a catalytic coating

The invention relates to a rare earth metal tungstate nanosheet material as well as a preparation method and application thereof. The rare earth metal tungstate nanosheet material comprises a PO4 < 3->-LnWO4 nanosheet, and Ln is at least one of lanthanide series rare earth metals. The preparation method comprises the following steps: dissolving phosphotungstic acid and a precursor in a solvent, and stirring to form a solution; adding an organic amine ligand, and stirring to form a transparent solution; performing solvothermal reaction on the solution; and centrifuging, washing with ethanol and drying to obtain the rare earth metal tungstate nanosheet material. A solvothermal reaction method is adopted to successfully construct a two-dimensional sheet structure material formed by interweaving nanowires, the material has high specific surface area, abundant pores and excellent structural stability, and the problems that a traditional photocatalytic material is single in structure and insufficient in active site are effectively solved. The photocatalyst shows excellent degradation capability on various typical antibiotic pollutants, breaks through the limitation that most photocatalytic materials are only effective on single pollutants, and realizes relatively high pollutant degradation universality.

The application relates to an aluminum alloy cable and a preparation method thereof, the aluminum alloy cable comprises, from inside to outside, an aluminum alloy conductor pipe, an insulation layer, a shielding layer and an outer protective layer which are sequentially arranged; the material of the aluminum alloy conductor pipe comprises aluminum, a rare earth metal, iron, copper and magnesium; the aluminum alloy conductor pipe comprises the rare earth metal 0.1-0.5%, the iron 0.5-1.8%, the copper 0.15-0.3% and the magnesium 0.01-0.05% according to 100% of the mass fraction of the aluminum alloy conductor pipe. The application limits the material of the aluminum alloy conductor pipe in the aluminum alloy cable, and specifically limits the mass fraction of each material in the aluminum alloy conductor pipe, so that the mechanical strength of the aluminum alloy cable is improved, and the fatigue resistance and the service life under the vibration working condition of the aluminum alloy cable are improved.

A method for extracting a rare earth metal from a mixture of one or more rare earth metals comprises contacting an acidic solution of the rare earth metal with a composition which comprises an ionic l

The invention provides a high-needle-flame-resistance halogen-free PFAS-free flame-retardant polycarbonate composite material as well as a preparation method and application thereof, and belongs to the technical field of high polymer materials. Through step-by-step addition of rare earth metal salt, calcination in a nitrogen-hydrogen mixed atmosphere and surface phosphorylation modification, rare earth elements are enriched on the surfaces of particles to form concentration gradient distribution, redox pairs and oxygen vacancy structures are generated, and P-O-rare earth bonds are formed. A 'P-Zn-Si' ternary synergistic flame-retardant system is constructed by the modified nano zinc borate, a phosphazene flame retardant and a silicon component, and a gradient ceramic-carbon layer barrier is quickly formed during combustion, so that a multi-stage protection mechanism is realized. According to the present invention, the product has characteristics of no PFAS addition and GB4943.1-2022 needle flame test (S.2 test) standard, during the needle flame test, the product is extinguished after the product is away from the fire, does not drop the burning cotton, has characteristics of high safety performance, no fluorine, safety, environmental protection, excellent chemical resistance, excellent weather resistance and excellent impact resistance.