33results about How to "Excellent formability" patented technology

The invention provides a flexible nano thermal insulation material and a preparation method and application thereof, and the preparation method of the flexible nano thermal insulation material comprises the following steps: mixing low-heat-conductivity-coefficient powder, a fibrosis adhesive and an optional additive, carrying out ball milling to obtain floccule, and rolling the floccule into a film-shaped flexible nano thermal insulation material. According to the invention, the low-thermal-conductivity powder is cross-linked, fixed and rolled to form the flexible film by using the fibril formed by the fibrillating adhesive, so that the pore structure of the low-thermal-conductivity powder is maintained without introducing the adhesive with high thermal conductivity for forming; therefore, the low heat conductivity coefficient of the powder is kept, and meanwhile, the powder has good processing formability. The prepared flexible nano heat insulation material has excellent flexibility, heat insulation performance and certain tensile and compression performance, and can be widely applied to the fields of aerospace, constructional engineering, shipbuilding, automobile manufacturing and the like.

The invention belongs to the field of sulfone polymer materials, and particularly relates to a sulfone polymer with narrow molecular weight distribution and low gel content and a preparation method thereof. The preparation method comprises the following steps: 1) adding an organic bisphenol compound, 4, 4 '-dichlorodiphenyl sulfone, a salt-forming agent and a purified aprotic polar solvent into a reactor, uniformly stirring and mixing the system, then carrying out deoxygenization operation, and controlling the oxygen content in the system to be less than or equal to 100ppm; and 2) after the replacement is completed, introducing inert gas (such as nitrogen) into the system for a long time, and carrying out two-stage heating reaction under the condition to obtain a viscous sulfone polymer solution. The molecular weight distribution of the sulfone polymer is less than 3, and the gel structure content is greater than 0 and less than 3 mol%. The oxygen content in a reaction system is reduced, and generation of polymer free radicals is reduced, so that the gel structure content is controlled, and the linear sulfone polymer material with narrow molecular weight distribution is obtained.

The invention discloses a method for preparing high-melt-strength polypropylene by using a bifunctional acrylate monomer, and relates to a method for preparing the high-melt-strength polypropylene by using bifunctional acrylate as a monomer long-chain branched modified polypropylene. The invention aims to solve the problem that the application capability of polypropylene is influenced due to low strength of polypropylene melt. The method comprises the following steps: 1, adding polypropylene particles, a bifunctional acrylate monomer, an interface agent, a co-monomer, an initiator and deionized water into a reactor, and heating for swelling; 2, heating the reaction system, and carrying out a grafting reaction; and 3, washing, extracting and drying the grafted product to obtain the bifunctional acrylate modified high-melt-strength polypropylene. The grafting effect of the high-melt-strength polypropylene is regulated and controlled by regulating and controlling the preparation process, so that the melt strength of the polypropylene is improved, and the application performance of the polypropylene is further improved. The method is applied to the technical field of polymer materials.

The invention discloses a puncture-resistant biodegradable film bag and a preparation method thereof. The puncture-resistant biodegradable film bag is prepared from the following raw materials in parts by weight: 50-80 parts of biodegradable polyester, 1-20 parts of a modifier and 10-35 parts of an inorganic filler, wherein the total part number of the three raw materials is 100; the composition further comprises 0.1-5 parts of a cross-linking agent, 0.1-5 parts of an antioxidant and 0.1-1 part of a dispersing agent; the weight-average molecular weight of the puncture-resistant biodegradable material is 100,000-300,000; and the cross-linking agent is at least one of triallyl isocyanurate, trimethylallyl isocyanate, trimethylolpropane triacrylate, trimethylolpropane trimethacrylate and triglycidyl tripolyisocyanate. The modifier, the cross-linking agent and the biodegradable polyester have a synergistic effect, and through an electron beam irradiation process, not only can the puncture strength of the film bag be greatly improved, but also the MD tensile strength and the TD tensile strength are also greatly improved.

The present invention provides a modified polyphenylene ether resin foam sheet which has good moldability, a very low relative dielectric constant and a very low dielectric loss factor at high frequencies, self-extinguishing properties or flame retardancy imparted thereto, and excellent surface properties. This modified polyphenylene ether resin foam sheet is obtained by foaming a modified polyphenylene ether resin containing a flame retardant, and has a relative dielectric constant of 1.10-2.00 and a dielectric loss factor (tan [delta]) in the range of 0.5 * 10 <-3 > to 2.5 * 10 <-3 >. The modified polyphenylene ether resin foamed sheet according to the present invention is a modified polyphenylene ether resin foamed sheet in which a modified polyphenylene ether resin foamed resin containing both a halogen-based flame retardant and a phosphorus-based flame retardant having a specific weight-average molecular weight is foamed. And the average bubble diameter and the bubble number density of the modified polyphenylene ether resin foam sheet are within predetermined ranges.

The invention belongs to but not limited to the technical field of hydrogel, and particularly relates to a processing method of tough, transparent and adhesive supramolecular hydrogel, which comprises the following steps: step 1, preparing a supramolecular hydrogel precursor with a specific shape; step 2, dissolving the prepared precursor in water; step 3, freezing under a low-temperature condition; step 4, standing the frozen supramolecular hydrogel in air or dry inert gas; step 5, cutting and folding the obtained hydrogel, and processing the hydrogel into another shape; and 6, swelling the processed hydrogel in an acid-containing nutrient solution to obtain the final hydrogel. By adopting a supramolecular strategy and utilizing a high-density supramolecular network formed by tannic acid (TA) and polyvinyl alcohol (PVA), the mechanical property, transparency and adhesiveness of the hydrogel are remarkably improved.

The utility model discloses a visual system. The visual system comprises a lens cone, an optical element group and a spacer group, wherein the optical element group and the spacer group are arranged in the lens cone; the optical element group comprises a first element group with negative focal power, a second element group with positive focal power, a third element group and a fourth element group with positive focal power which are sequentially arranged from the first side to the second side along the optical axis; the first element group comprises a reflective polarizing element, a quarter-wave plate and a first lens; the second element group comprises a second lens; the third element group comprises a third lens; the fourth element group comprises a fourth lens; the spacer group includes a first spacer disposed on the second side of the first lens and in contact with the second side of the first lens; wherein the effective focal length FG1 of the first element group and the total effective focal length f of the visual system meet the following formula:-41lt; fG1 / flt; 18); and a center thickness CT1 of the first lens on the optical axis, a spacing distance T12 of the first lens and the second lens on the optical axis, and a maximum thickness CP1 of the first spacer satisfy: 1.5 lt; cT1 / (CP1 + T12) lt; and 4.5.

The invention relates to the technical field of environment-friendly plastics, and particularly discloses an environment-friendly self-repairing flame-retardant plastic and a preparation method thereof. The environment-friendly self-repairing flame-retardant plastic is prepared from the following raw materials in parts by mass: 50 to 100 parts of polypropylene, 10 to 30 parts of polylactic acid, 5 to 15 parts of poly (butylene terephthalate)-adipate, 1 to 3 parts of hydroxy cellulose, 5 to 15 parts of diatomite, 1 to 5 parts of graphene oxide, 1 to 2 parts of sodium alginate, 1 to 2 parts of calcium lactate, 0.05 to 0.45 part of glutaraldehyde, 5 to 10 parts of halogen-free flame retardant, 1 to 3 parts of antioxidant and 0.5 to 1.5 parts of heat stabilizer. The flame-retardant plastic disclosed by the invention has the advantages of easily available raw materials, good environmental protection property, capability of being degraded through compost, excellent mechanical strength and self-repairing performance, good heat-resistant stability and flame retardance, simple preparation process and good biodegradability, is suitable for large-scale popularization and application, and has good economic and environmental benefits.

The invention relates to a low-cost and high-corrosion-resistance steel plate for a photovoltaic steel frame and a manufacturing method of the low-cost and high-corrosion-resistance steel plate. A base plate of the steel plate comprises the following chemical components in percentage by mass: 0.200-0.230% of C, 0.90-1.10% of Mn, less than or equal to 0.005% of S, less than or equal to 0.022% of P, 0.10-0.20% of Si, 0.025-0.050% of Als, 0.025-0.035% of Ti, less than or equal to 0.0060% of N and the balance of Fe and inevitable impurities. The manufacturing method comprises the working procedures of acid continuous rolling, continuous hot-dip galvanizing, aluminum and magnesium plating, finishing, color coating and rolling. The steel plate for the photovoltaic steel frame, provided by the invention, has the characteristics of low cost, high surface, high corrosion resistance, high strength, high ductility and high deformation resistance.

A heat-accumulating composition comprising a substance A and a polymer 2, the heat-accumulating composition having a melting peak temperature between 10 and 60°C and a melting enthalpy between 10 and 60°C of 30 J / g or more, the heat-accumulating composition not having an island-in-sea structure, or the heat-accumulating composition having an island-in-sea structure, the volume average equivalent circle particle diameter of the islands (dispersed phase) being 1.5 μm or less or the area ratio of the islands (dispersed phase) being 15% or less.

The invention relates to an ultra-high molecular weight polyethylene powder and a molded body. Provided is an ultra-high molecular weight polyethylene powder or the like which is capable of greatly shortening the kneading time, producing a uniform gel in a short time, and producing a gel having a high polymer concentration, and which has excellent moldability. An ultra-high molecular weight polyethylene powder in which the intrinsic viscosity (IV) of the ultra-high molecular weight polyethylene powder is 1.0 dL / g to 38.0 dL / g inclusive, the average particle diameter (D50) is 50 [mu] m to 400 [mu] m inclusive, and the dissolution time of the powder having the particle diameter (D50) is 5 seconds to 80 seconds inclusive.

The present application discloses an optical imaging lens, which includes, in order from the object side to the image side along the optical axis: a first lens with positive optical power; a second lens; a third lens with positive optical power; a fourth lens; a fifth lens with positive optical power; and a sixth lens with negative optical power; wherein the total effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy: f / EPD<1.35; the effective focal length f3 of the third lens, the effective focal length f5 of the fifth lens, and the effective focal length f1 of the first lens satisfy: 0.9<(f3+f5) / f1<1.7.

The invention relates to a PPO alloy material, a preparation method thereof and a PPO alloy product. The PPO alloy material comprises the following components in parts by weight: 30-50 parts of PPO, 30-40 parts of PPS, 3-10 parts of a compatilizer, 1-3 parts of a processing aid and 1-10 parts of a wear-resistant aid, the processing aid is prepared from at least two of tetrakis [beta-(3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid] pentaerythritol ester, bis (2, 4-dicumyl phenyl) pentaerythritol diphosphite and pentaerythritol dodecylthiopropyl ester, and the processing aid is prepared from at least two of tetrakis [beta-(3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid] pentaerythritol ester, bis (2, 4-dicumyl phenyl) pentaerythritol diphosphite and pentaerythritol dodecylthiopropyl ester. The PPO, the PPS, the compatilizer, the processing aid and the wear-resistant aid are mixed, the specific types of the processing aid are controlled, and the components act according to a specific proportion, so that the impact strength and the wear resistance are effectively improved on the basis of ensuring the tensile strength, and the molding processability is relatively good.

The present invention addresses the problem of providing a heat-bondable composite fiber from which a non-woven fabric that has an excellent texture and excellent shaping properties can be obtained. Provided is a heat-bondable composite fiber which comprises a first component that contains a polyester-based resin and a second component that contains a polyolefin-based resin having a melting point lower than that of the polyester-based resin by 15 °C or more and which has a concentric core-shell structure in which, in a cross section of a fiber perpendicular to the lengthwise direction of the fiber, the second component occupies the outer circumference of the fiber, wherein elongation at break is 350% or more, and the ratio of elongation at break to fineness is 80% / dtex or more.

The invention belongs to the technical field of electric power engineering, and particularly relates to a composite layer material for a cable intermediate joint and a preparation method of the composite layer material. The composite layer material for the cable intermediate joint is composed of an inner semi-conductive layer, an insulating layer and an outer semi-conductive layer, the silicone rubber is prepared from the following raw materials: methyl vinyl silicone rubber, methyl phenyl vinyl silicone rubber, trifluoropropyl methyl vinyl silicone rubber, a vulcanizing agent, an assistant crosslinker, an accelerant, diphenyl silanediol, an anti-aging agent, trifluoropropyl cage type silsesquioxane, and a mixture of modified nano hydroxyapatite and nano hectorite. According to the composite layer material for the cable intermediate joint, the three layers adopt the consistent siloxane main chain structure and vulcanization system, interlayer chemical compatibility is ensured, synchronous co-crosslinking is achieved, and by adjusting the silicone rubber composition and proportion of all the layers, the composite layer material can be applied to the cable intermediate joint. And it is ensured that the prepared composite layer material for the cable intermediate joint has excellent mechanical and hydrophobic water-blocking performance.

The application discloses a kind of plant polyphenol and maleic anhydride copolymer modified polyester and its preparation method, the modified polyester includes polyester, plant polyphenol and maleic anhydride copolymer.The preparation method includes that the plant polyphenol and maleic anhydride copolymer are dissolved in organic solvent, catalyst is added and mixed uniformly, and reaction liquid is obtained;The reaction liquid is heated to 25-80 DEG C, and is reacted under the condition of stirring for 4-16h, is cooled to room temperature, then is added in petroleum ether or ethyl acetate, and solid precipitate is separated out;Solid precipitate is filtered out and is washed with ethanol, and is dried, and antibacterial and antioxidant functional modified material is obtained;Antibacterial and antioxidant functional modified material is mixed with the polyester and is placed in high mixer, and is extruded again, and the modified polyester is obtained.The modified polyester material has the characteristics of good antibacterial and antioxidant performance, good processing performance, good tensile strength and toughness.

The invention discloses a preparation method of an aluminum foil blank for a high-strength 8021 battery soft package, and belongs to the technical field of aluminum alloy processing. According to the method, an 8021 alloy cast ingot serves as a raw material, hot rolling, segmented cold rolling, medium and low temperature intermediate annealing, finish rolling and other procedures are carried out, and the high-strength aluminum foil blank is prepared by optimizing rolling reduction distribution and roll surface roughness. The tensile strength of the obtained blank is larger than or equal to 170 MPa, the plasticity and the surface quality are excellent, the process energy consumption is lower, equipment does not need to be newly added, and the method is suitable for industrial production of the aluminum foil blank for the high-end soft package lithium battery aluminum-plastic film.

This invention relates to a method for preparing a high dielectric constant and low dielectric loss CCTO@NH2-rGO / PEI composite film material. The method first prepares a solution of aminated reduced graphene oxide supported on calcium copper titanate, then disperses PEI resin particles into the solution. After vacuum degassing and heating to remove DMAc solvent, a calcium copper titanate-supported aminated reduced graphene oxide / polyetherimide composite material (CCTO@NH2-rGO / PEI) is obtained. This invention modifies the aminated reduced graphene oxide with calcium copper titanate, allowing CCTO nanoparticles to be uniformly embedded in the layers of the aminated reduced graphene oxide. Then, the CCTO nanoparticles are composited with PEI, significantly improving the dielectric constant of PEI. This method effectively enhances the dielectric constant of the composite material while ensuring good processing performance of the PPO composite material and maintaining low dielectric loss.

The application belongs to the technical field of electric power engineering, and particularly relates to a composite layer material for cable intermediate joint and a preparation method thereof. The composite layer material for cable intermediate joint is composed of an inner semi-conductive layer, an insulating layer and an outer semi-conductive layer. The insulating layer is composed of the following raw materials: methyl vinyl silicone rubber, methyl phenyl vinyl silicone rubber, trifluoro propyl methyl vinyl silicone rubber, vulcanizing agent, auxiliary cross-linking agent, accelerator, diphenyl silicone diol, anti-aging agent, trifluoro propyl cage type silsesquioxane, and a mixture of modified nano-hydroxyapatite and nano-laponite. The composite layer material for cable intermediate joint has a consistent siloxane main chain structure and vulcanization system in three layers, which ensures the chemical compatibility between layers and realizes synchronous co-crosslinking. By adjusting the composition and ratio of silicone rubber in each layer, the prepared composite layer material for cable intermediate joint has excellent mechanical and hydrophobic water-blocking properties.

A polyethylene powder, wherein the relaxation time T of each component and the abundance ratio R of the components satisfy <Requirement (1)> and <Requirement (2)> when a three-component approximation is performed on a free induction decay curve obtained by the Carr Purcell Meiboom Gill method in pulse NMR. <Requirement (1)> At 180°C, the entanglement index calculated by (Formula I) is 12 milliseconds to 25 milliseconds. (Entanglement Index) = T α ×R α / (R α +R β )+T β ×R β / (R α +R β )……(Formula I). α : relaxation time of the low-mobility component α (milliseconds); R α : The presence ratio of the component α with low mobility (%); T β : relaxation time of the component β with intermediate mobility (milliseconds); R β : The proportion of component β with moderate mobility (%). <Requirement (2)> At 180°C, the proportion of the component with moderate mobility determined from (Formula II) is 0.25 to 0.5. (Ratio of component with moderate mobility) = R β / (R α +R β )……(Formula II).

The present application discloses a camera lens, which comprises, in order from the object side to the image side along the optical axis: a first lens with positive focal power; a second lens with negative focal power; a third lens with positive focal power; a fourth lens with positive focal power; and a fifth lens with negative focal power; wherein a distance EPP from the aperture of the camera lens to the object side surface of the first lens on the optical axis satisfies: 0mm<EPP<0.35mm; an effective focal length fa45 of an air lens formed by the image side surface of the fourth lens and the object side surface of the fifth lens and a spacing distance T45 between the fourth lens and the fifth lens on the optical axis satisfy: 3.5≤fa45 / T45≤6.0.

The present invention provides an ethylene-vinyl alcohol copolymer having both moldability and gas barrier properties at high humidity. An ethylene-vinyl alcohol copolymer having a content of an ethylene structural unit of 20-60 mol%, the ethylene-vinyl alcohol copolymer having a structural unit (1) described below. [In structural unit (1), R1 is an alkyl group having 1-3 carbon atoms, and X is an alkylene group having 1-5 carbon atoms. ]

The invention relates to SnSb alloy preformed soft solder and a preparation method thereof, and belongs to the field of welding materials. The preparation method of the SnSb alloy pre-forming soft solder comprises the following steps: (1) preparing materials: preparing metal tin and metal antimony into an alloy raw material; (2) alloy smelting: smelting the alloy raw materials into a melt and preserving heat; wherein the smelting temperature is 800 to 950 DEG C; (3) ultrasonic treatment: carrying out ultrasonic treatment on the melt; wherein the ultrasonic power is not lower than 1KW, the ultrasonic frequency is not lower than 20KHz, and the ultrasonic treatment time is not shorter than 1min; (4) high-temperature casting is conducted, specifically, the melt obtained after ultrasonic treatment is cast, and the casting temperature is 800-950 DEG C; (5) water-cooling forming; and the SnSb alloy pre-forming soft solder is obtained. The SnSb alloy preformed soft solder is prepared by introducing ultrasonic treatment and combining a high-temperature casting and water-cooling forming method, intermetallic compounds can be effectively refined, and the intermetallic compounds of the prepared SnSb alloy preformed soft solder are small in size and uniform in distribution.

The present invention provides a bipolar plate batch processing and forming device, which belongs to the technical field of bipolar plate processing, and includes a bottom plate, a containing assembly, a heating and pressing roller, a winding roller, a first driving assembly and a second driving assembly. The upper edge of the bottom plate is fixed with a top plate by a plurality of columns. The containing assembly is arranged on the upper part of the bottom plate, and is used to provide support for a plurality of polyethylene plates. The heating and pressing roller and the winding roller are arranged above the containing assembly, and the winding roller is used to wind graphite felt. The first driving assembly is installed at the bottom of the top plate, and is used to drive the heating and pressing roller and the winding roller to move along the top of the containing assembly. Compared with the prior art, the embodiment of the present invention can realize continuous automatic hot pressing of a plurality of polyethylene plates and graphite felt when processing and forming bipolar plates, and has the advantages of good bipolar plate processing and forming effect and high processing and forming efficiency.

The present invention belongs to the technical field of processing and manufacturing of polytetrafluoroethylene tubes, and specifically relates to a transparent polytetrafluoroethylene tube, a preparation method and an application thereof. The present invention adopts high compression ratio polytetrafluoroethylene and PFA to blend and extrude to form a transparent polytetrafluoroethylene tube, thereby improving the transparency of the transparent polytetrafluoroethylene tube; at the same time, a secondary sintering method is adopted to promote the fusion of high compression ratio polytetrafluoroethylene and PFA, which can not only improve the transparency of the transparent polytetrafluoroethylene tube, but also improve the strength and elongation of the transparent polytetrafluoroethylene tube. The transparent polytetrafluoroethylene tube provided by the present invention has an outer diameter of less than 5.0 mm and has a high transparency, and is suitable for use in medical devices.

This disclosure relates to a linear copolyamide, its preparation method, and its application, comprising a copolymer formed from a lactam compound, caprolactam having a nitrogen-containing side group, a diacid, and a diamine; the linear copolyamide includes a first repeating unit as shown in formula (1) and a second repeating unit as shown in formula (2), wherein R1 is C 1~20 The substituted or unsubstituted alkylene group of R1; the substituents of R1 include C 1~5 alkyl, C 6~10 aryl and C 3~10 One or more of the heteroaryl groups; the nitrogen-containing side group R3 is an amino group with a substituent. The linear copolyamide disclosed herein has a tunable melting point, a low melting point, adjustable side group groups, and excellent processing performance.

The application belongs to the technical field of resin materials for copper-clad plates, and particularly relates to a carbon-hydrogen resin composition for prepreg and a preparation method thereof. The carbon-hydrogen resin composition is prepared from the following raw materials in parts by mass: hyperbranched modified prepolymer resin 90-100 parts, inorganic filler 15-25 parts, silane coupling agent 0.2-0.4 parts, crosslinking agent 10-20 parts, initiator 0.8-1.5 parts, dibutyltin dilaurate 0.1-0.3 parts, antioxidant 0.5-1 part, and toluene 50-80 parts. The carbon-hydrogen resin composition prepared by the application has low dielectricity, high thermal conductivity, high heat resistance, high toughness, and excellent processing forming property.

An object of the present invention is to provide a resin composition including a thermoplastic resin and an inorganic filler, which can easily undergo molding processing and has flexibility and a sense of massiveness, and a molded article thereof. A resin composition, including 15 to 50 parts by mass of a specific 4-methyl-1-pentene / α-olefin copolymer (A), 10 to 50 parts by mass of an inorganic filler (B), and 5 to 49 parts by mass of a thermoplastic elastomer (C) (a total amount of 4-methyl-1-pentene / α-olefin copolymer (A), inorganic filler (B), and thermoplastic elastomer (C) is 100 parts by mass), wherein the thermoplastic elastomer (C) is at least one selected from the group consisting of an olefinic thermoplastic elastomer (C1) and a styrenic thermoplastic elastomer (C2); and a molded article including the resin composition.

The invention belongs to the technical field of friction materials and phenolic resin modification, and discloses a modified phenolic resin-based material for a high-temperature-resistant brake pad and a preparation method of the modified phenolic resin-based material. The modified phenolic resin-based material is prepared from the following components in parts by weight: 80 to 120 parts of novolac type phenolic resin, 8 to 30 parts of low-free hydroxymethyl resol type phenolic prepolymer containing a rigid bisphenol structural unit and 6 to 9 parts of hexamethylenetetramine, wherein the rigid bisphenol structural unit exists in the low-free hydroxymethyl resol type phenolic prepolymer in the form of a copolycondensation structural unit, and the obtained material still retains part of functional structural units which are not completely reacted after primary molding. The preparation method comprises the following steps: preparing a low-free hydroxymethyl resol type phenolic prepolymer through prepolymerization, mixing the low-free hydroxymethyl resol type phenolic prepolymer with novolac type phenolic resin, adding hexamethylenetetramine, and carrying out hot press molding and staged curing. The material has better high-temperature structural stability and heat fading resistance, and is suitable for a resin-based binding phase in a brake pad friction material.

The invention discloses Mn-Cr-V-N series high-strength plastic air-cooled hardened steel and a preparation method thereof, and the Mn-Cr-V-N series high-strength plastic air-cooled hardened steel comprises the following components in percentage by mass: 0.46 to 0.55 percent of C, 0.5 to 1.0 percent of Si, 1.51 to 2.51 percent of Mn, 2.51 to 3.51 percent of Cr, 0.21 to 0.36 percent of V, 0.02 to 0.10 percent of N, less than 0.01 percent of P and S, and the balance of Fe. The preparation process comprises the steps of smelting, forging, hot rolling, cold rolling, annealing and air cooling quenching. The invention relates to the technical field of ultra-high-strength steel and processing thereof, the air-cooled hardened steel with the tensile strength higher than 2100 MPa and the ductility higher than 10.0% is prepared, and compared with the prior art, the material prepared through the method has the advantages of ultra-high strength, high toughness and oxidation resistance, industrial large-scale production is easy, and wide development and application prospects are achieved.