72 results about "Compound structure" patented technology

The invention discloses a compound structure identification database construction method, system and device and a medium, and the method comprises the steps: inputting a model training data set into a plurality of retention time prediction models for training, and obtaining a plurality of trained retention time prediction models; verifying the plurality of trained retention time prediction models by adopting a model verification data set, and selecting an optimal retention time prediction model; inputting the migration training data set and the migration verification data set into the optimal retention time prediction model for migration learning to obtain a target retention time prediction model; inputting to-be-predicted compound structure data into the target retention time prediction model for prediction to obtain predicted retention time; and constructing a compound structure identification database according to the predicted retention time. The data in the compound structure identification database can be perfected, and the accuracy of the compound structure identification database is improved, so that the database performance is improved.

The invention discloses a multifunctional foam pad made of a regenerated composite material and a production process of the multifunctional foam pad, and belongs to the technical field of production of regenerated composite materials. The surface of the recycled PET non-woven fabric printing layer is provided with 50 + / -5 [mu] m micropores, the cat palm bionic gradient foaming layer (the density is 0.15-0.35 g / cm < 3 > gradient distribution) is formed by blending and foaming PVC recycled materials, PET bottle chips and waste rubber powder, and the glass fiber net reinforced rubber matrix layer and the triangular pyramid micro-sucker bottom layer are arranged from top to bottom. The preparation process comprises the steps of waste material near-infrared sorting and pretreatment, multi-stage dynamic blending granulation, supercritical CO2 gradient foaming, bionic calendaring forming and laser positioning hot-pressing compounding, high-valued utilization of multi-element waste materials is achieved through combination of bionic structure design and a green process, the product has sound insulation, buffering and anti-skid performance, the tear resistance is improved by 150%, and the service life of the product is prolonged. The problems that a traditional foaming cushion depends on raw plastic, is single in function and causes manufacturing pollution are solved, and resource circulation and function strengthening unification are achieved.

The invention relates to the technical field of single-molecule devices, in particular to a single-molecule device for detecting small-molecule gas based on supramolecules and a preparation method of the single-molecule device. The monomolecular device comprises a functional molecule and a graphene electrode pair, wherein the functional molecule is connected between the graphene electrode pair through an amido bond. A cucurbituril hydrophobic cavity structure in the functional molecular structural formula can contain and capture target small molecular gas, gas molecules of different volumes are selectively included through multiple weak interaction, a dynamically-adjustable subject-object compound structure is formed, and then switching type sensing detection on the small molecular gas is achieved. The amino terminal of the end part of the main bridging unit in the functional molecule can be connected with the carboxyl terminal of the graphene point electrode in a covalent bond manner, and amide condensation molecular chain connection is formed at the two ends of the graphene point electrode, so that the stability of a monomolecular device is improved. The preparation method provided by the invention is simple in process, mild and controllable in reaction condition and beneficial to large-scale production.

Vertical ribs are divided into middle vertical ribs and side vertical ribs on the two sides, the two ends of each middle vertical rib are connected with an upper frame rib and a lower frame rib respectively, the number of the middle vertical ribs is at least two, and the number of the side vertical ribs is at least two. Transverse ribs are arranged between the adjacent middle vertical ribs, so that the middle vertical ribs can support the structural strength of the whole grid in the vertical direction; on the other hand, the upper ends of the side vertical ribs are connected with the upper frame ribs, the lower ends of the side vertical ribs are not connected with the lower frame ribs, and inclined ribs are arranged between the side vertical ribs and the adjacent vertical frame ribs and between the side vertical ribs and the middle vertical ribs, so that the lower part of the side vertical rib structure can properly creep; and the phenomenon that the vertical ribs are stressed and broken due to the expansion of the active substance in the use process of the ribs in the grid is avoided, so that the improvement of the battery performance and the prolonging of the cycle life are facilitated.

The invention discloses a compound and an organic electroluminescent device. The compound has a structure as shown in a formula 1. On the basis of an existing carbazole-arylamine material, the structure of the compound is improved, deuteration is introduced to a special position matched with a core area, the optimized compound has good stability, meanwhile, the carrier mobility is further improved, the service life of a device is guaranteed, and compared with the closest prior art, the material has the advantages that the efficiency is high, and the cost is low. And the luminous efficiency of the device is improved. Meanwhile, compared with the existing perdeuterated carbazole-arylamine material, on the basis that the use effect of the material basically reaches the level of the prior art, the design scheme of introducing the deuterated carbazole-arylamine material has better economic benefit and use value. Formula 1.

The invention discloses fine dried noodles with a low glycemic index and a preparation method of the fine dried noodles. The fine dried noodles are prepared from the following production raw materials: high-amylose corn starch subjected to alkaline hydrothermal modification and a composite structure base material, the composite structure base material is formed by compounding highland barley flour, vital gluten and wheat flour. The preparation method comprises the following steps: premixing the vital gluten and the wheat flour, and adding water for the first time to prepare a mixture 1; premixing modified starch and coarse cereal powder, and then adding water for the second time to prepare a mixture 2; and mixing the two mixtures, stirring, fermenting, rolling, cutting into strips, and drying. The invention has the following advantages: 1) through the synergistic effect of the high-amylose corn starch hydrothermally modified by the alkaline method and the composite structure base material with a specific ratio, the prepared fine dried noodles have significantly reduced glycemic index; the method has the advantages of low glycemic index, low glycemic index, low glycemic index, low glycemic index, low glycemic index, low glycemic index, low glycemic index, low glycemic index, low glycemic index, low glycemic index, low glycemic index, low glycemic index, low glycemic index, low glycemic index, low glycemic index, low glycemic index, low glycemic index, low glycemic index and good glycemic index.

The invention relates to a face mask comprising a compound structure with an inner layer and two sandwich layers, whereinthe inner layer is made from a filter material for filtering particles and germs,the sandwich layers are made from a textile material,the inner layer is sandwiched by the sandwich layers, andthe sandwich layers are bonded to the inner layer at least in sections along the perimeter of the face mask and in sections in the inner area of the face mask.In this way, a reusable face mask with enhanced filtration efficiency is provided.

The invention relates to the technical field of Pick rackets, in particular to a Pick racket with an asymmetric composite structure, which comprises a base plate, a first racket surface and a second racket surface, the first racket surface is provided with a first clamping column; the second racket surface is provided with a second clamping column; the base plate is rotationally provided with a fixing column. The bat faces are fixed through spiral matching of the first clamping column, the second clamping column and the fixing column, so that the first bat face and the second bat face respectively keep uniformity of materials of the whole faces, the problem that a frame is not matched with the materials of the bat faces is solved, stress unbalance caused by sudden change of the materials is avoided even if a ball makes contact with the edge of the bat faces during ball hitting, and the service life of the bat is prolonged. Athletes are guaranteed to play competitive roles; in addition, the first racket face and the second racket face are both of a detachable structure, disassembly and assembly can be completed by rotating the fixing column, operation is convenient and fast, extra tools are not needed, the double racket faces are matched with materials with different performance parameters in a supporting mode, a user can flexibly switch the racket faces according to sports scenes and individual hitting habits, and differential hitting hand feelings and effects are achieved.

This invention discloses an anticoagulant microsphere, its preparation method, and its application, belonging to the field of biomedical materials technology. The preparation method includes: preparing a droplet solution using polyethersulfone, polyvinylpyrrolidone, and dimethylacetamide; preparing polyethersulfone framework microspheres; preparing a functional monomer solution using acrylic acid monomer, 2-acrylamide-2-methylpropanesulfonic acid monomer, initiator, crosslinking agent, and deionized water; immersing the polyethersulfone framework microspheres in the functional monomer solution; polymerization; and post-treatment. This invention utilizes oil-phase isolated in-situ polymerization, allowing the functional monomers to polymerize within the aqueous phase inside the porous framework microspheres and form a stable bond with the pore walls, preventing adhesion and extravasation. The resulting PES-gel interpenetrating network composite structure exhibits excellent anticoagulant properties. The preparation process is simple, easy to scale up for production, the oil phase and ethanol are recyclable, the steps are modular, and the production window is wide, making it suitable for large-scale and continuous production.

The present application relates to the polishing disc cleaning device in full caliber polishing, is carried on full caliber polishing polishing machine, it includes: brush mechanism, brush mechanism is connected to polishing machine crossbeam, its output end below is connected with the brush disc of compound structure, the brush disc has brush hair towards the polishing disc surface side, the brush hair center to the outer edge gradually from sparse to dense arrangement forms multiple rings, the washing range of brush disc covers the entire polishing disc surface, the liquid supply faucet provides the cleaning agent for the brush hair in real time;Liquid supply mechanism, liquid supply mechanism provides the cleaning agent suitable for temperature, and according to the required flow is supplied to the polishing disc surface through liquid supply faucet;Control cabinet, at least part of the components of liquid supply mechanism and brush mechanism is electrically connected with control cabinet.The present application realizes the efficient, uniform, stable cleaning of polishing disc by integrating liquid supply mechanism, brush mechanism and control cabinet and other components, improves the cleaning quality and efficiency.At the same time, through the accurate control and monitoring system, the reliability and safety of the cleaning process are ensured.

The application discloses a flexible composite structure mold and belongs to the technical field of mechanical molds. The mold base assembly comprises a mold base and a supporting mechanism guide sleeve fixing plate. A plurality of mold surface supporting mechanisms are evenly and vertically arranged in the mold base. The execution ends of the mold surface supporting mechanisms pass through the supporting mechanism guide sleeve fixing plate and are positioned at the bottom of the working mold surface. The mold surface supporting mechanism and the multi-point forming curved surface part are combined, the workload of mold processing is reduced, and the mold processing efficiency is improved. The mold quality and effective volume ratio are reduced by using the working mold surface with small thickness, the hollow base and the arrayed supporting rods, and the lightweight of the mold is realized. The working mold surface is connected to the base through the mold surface supporting mechanism, the working mold surface is detachable, the mold base is reused, and the mold manufacturing cost is reduced.

A system and packaged integrated circuit device include first and second integrated circuit dies with first and second communication coils, respectively. The second die is positioned with respect to the first die such that the first communication coil is aligned with the second communication coil to allow inductive coupling between the first communication coil and the second communication coil. The system and device also include a molding compound structure positioned around a perimeter of the second die, and an insulating layer positioned between the first die and the second die, and positioned between the first die and the molding compound structure. A method of forming a device includes forming the molding compound structure on at least four sides of the second die, exposing a backside of the second die, and forming the insulating layer on the backside of the second die and the molding compound structure.

A package assembly includes a silicon photonics chip having an optical waveguide exposed at a first side of the chip and an optical fiber coupling region formed along the first side of the chip. The package assembly includes a mold compound structure formed to extend around second, third, and fourth sides of the chip. The mold compound structure has a vertical thickness substantially equal to a vertical thickness of the chip. The package assembly includes a redistribution layer formed over the chip and over a portion of the mold compound structure. The redistribution layer includes electrically conductive interconnect structures to provide fanout of electrical contacts on the chip to corresponding electrical contacts on the redistribution layer. The redistribution layer is formed to leave the optical fiber coupling region exposed. An optical fiber is connected to the optical fiber coupling region in optical alignment with the optical waveguide within the chip.

The application relates to the field of robot control, and particularly discloses a PID control and gait planning method of a wheel-foot composite structure and electronic equipment, which comprises the following steps: a PID control model with a coupling compensation term is established; each joint angle error is calculated; adjacent joint motion interference is compensated according to the PID control model with the coupling compensation term; in the wheel mode, an outer ring controls speed with the second threshold value as the target, and an inner ring corrects the posture according to IMU feedback; when the inclination exceeds the third threshold value, the posture control weight is enhanced; in the foot mode, PID parameters are adjusted in advance according to laser radar prediction, and the adaptability to complex terrains is improved; terrain, gait, control precision and energy consumption data are collected in real time, PID parameters are automatically adjusted based on a PPO algorithm, and the control precision of the robot in unknown terrains is improved; and through a dynamic coupling compensation mechanism, the motion interference between joints is accurately resolved, each joint can keep high coordination in motion, and accurate motion postures can be stably maintained regardless of complex terrains.

A composition for resist underlayer film formation, which contains a resin (G) having a complex structural unit and a solvent, the complex structural unit having a structural unit (A) having an aromatic ring, and a structural unit (B) having one or more carbon atoms, the resin (G) being a resin obtained by a reaction of generating a covalent bond between a carbon atom constituting the aromatic ring of the structural unit (A) and a carbon atom in the structural unit (B), the structural unit (A) containing a structural unit (A-I) containing at least a nitrogen atom and a carbon-carbon triple bond, the structural unit (B) containing a structural unit (B-I) having a non-aromatic hydrocarbon ring, the number of carbon atoms constituting the non-aromatic hydrocarbon ring of the structural unit (B-I) being 5 to 30.

The utility model discloses a safety seat of a composite structure and a child restraint system.The safety seat of the composite structure comprises a frame and an insert embedded in the frame, the frame is made of foaming materials and forms a semi-surrounding structure, and the interior of the semi-surrounding structure is a sitting space; at least one part of the insert extends into the frame, the other part of the insert is exposed out of the frame, and the structural strength of the insert is greater than that of the frame; the inserts comprise one or more of the following inserts: a first insert in contact with the supporting surface; the second insert and the third insert are used for positioning the first restraining piece; the fourth insert is used for mounting a handle; the fifth insert is used for mounting a buffer part; the sixth insert is used for mounting a sunshade; and the seventh insert and the eighth insert are used for positioning the second restraining piece. The frame is made of the foaming materials, the self weight of the seat is effectively reduced, the use experience is improved, and meanwhile the advantages of being good in integrity and high in production efficiency are achieved.

This invention provides a semiconductor packaging structure and its fabrication method. The fabrication method includes the following steps: providing a packaging substrate, the packaging substrate including a first surface and a second surface disposed opposite to each other; providing at least one chip, each chip having metal bumps on its active surface; bonding the active surface of the chip to the first surface of the packaging substrate; providing at least one heat dissipation silicon sheet; and attaching each heat dissipation silicon sheet to the side of each chip away from the packaging substrate to form a molding compound structure. The molding compound structure includes a first molding compound layer and a second molding compound layer with different coefficients of thermal expansion. The first molding compound layer fills the gap between the chip and the packaging substrate, and the second molding compound layer is located on the packaging substrate, encapsulating the first molding compound layer, the chip, and the heat dissipation silicon sheet, exposing the side of the heat dissipation silicon sheet away from the chip. The semiconductor packaging structure fabrication method of this invention can achieve both high heat dissipation performance and high reliability of the packaging structure.

Resistive working memory device (100) comprising: a variable-resistance dielectric layer (110, 604) having a top surface and a bottom surface; a cathode (114, 112, 113, 608, 606, 607) arranged above the variable-resistance dielectric layer (110, 604) adjacent to the top surface; a metal cover layer (108, 602) arranged below the variable-resistance dielectric layer (110, 604) adjacent to the bottom surface; and an anode (106, 502) arranged below the metal cover layer (108, 602), wherein the resistive working memory device (100) further comprises: a semiconductor support area (103, 403) comprising a metal compound structure (101, 401) arranged in a low-k dielectric layer (102, 402) is arranged;and a dielectric protective layer (104, 404) having an opening over a section of the metal compound structure (101, 401), wherein side walls of the dielectric protective layer (104, 404) adjoining the opening terminate over the metal compound structure (101, 401) and wherein the anode (106, 502) lies over the dielectric protective layer (104, 404) and adjoins the metal compound structure (101, 401) through the opening in the dielectric protective layer (104, 404).

Methods for forming a connection structure, including: Forming a recess (108) within a dielectric layer (106); shape-adapted deposition of a barrier layer (110) within the recess; Forming a ruthenium lining with cobalt infusion over the barrier layer, the cobalt-containing ruthenium lining comprising: a first lining (120) directly above the barrier layer, wherein the first lining comprises ruthenium; a second lining (130) directly above the first lining, the second lining comprising cobalt; and a third lining (240) directly above the second lining, wherein the third lining contains ruthenium, wherein the ruthenium lining with cobalt infusion is formed by migration of cobalt atoms from the second lining into the first and the third lining; Deposition of a conductive material (242) over the ruthenium lining with cobalt infusion to fill the recess; and Forming a cover layer (256) over an upper surface of the conductive material, wherein the cover layer comprises cobalt.

According to the electric screwdriver of the composite structure, a first motor and a second motor of the electric screwdriver are fixedly arranged on one side of a mounting plate, a transmission mechanism is fixedly arranged on the other side of the mounting plate, the output end of the first motor is connected with the input end of the transmission mechanism, and a nut screwdriver head is connected with the output end of the transmission mechanism; one end of the screw bit is connected with the output end of the second motor through an elastic floating assembly, and the other end of the screw bit penetrates through the output end of the transmission mechanism and extends to the inner side of the nut bit. The screw bit is integrally arranged in the nut bit, the nut bit is also in butt joint with the nut while the screw bit is in butt joint with the screw, the nut bit is kept still when the second motor drives and controls the screw bit to rotate, and after the screw is adjusted, the first motor drives and controls the nut bit to rotate, and at the moment, the screw bit is kept still; and the screw at the set screwing depth can be fixed until the nut is tightened, so that the screw can accurately adjust functional parameters of a product.

A package assembly includes a silicon photonics chip having an optical waveguide exposed at a first side of the chip and an optical fiber coupling region formed along the first side of the chip. The package assembly includes a mold compound structure formed to extend around second, third, and fourth sides of the chip. The mold compound structure has a vertical thickness substantially equal to a vertical thickness of the chip. The package assembly includes a redistribution layer formed over the chip and over a portion of the mold compound structure. The redistribution layer includes electrically conductive interconnect structures to provide fanout of electrical contacts on the chip to corresponding electrical contacts on the redistribution layer. The redistribution layer is formed to leave the optical fiber coupling region exposed. An optical fiber is connected to the optical fiber coupling region in optical alignment with the optical waveguide within the chip.

The invention belongs to the technical field of organic electroluminescent devices, and discloses an electron transport layer material and an organic electroluminescent device.In the electron transport layer material, the compound structure is mainly composed of 9-alkyl-9-benzofluorene and two triazine groups, wherein the 9-alkyl-9-phenylfluorene is used as a bridging group, and the two triazine groups are respectively connected to phenyl in fluorene below the 9-alkyl-9-phenylfluorene group and phenyl on the 9-site. Through collaborative design of a fluorene bridging group and two triazine acceptor units, high electron mobility, adjustable energy level and excellent thin film form are realized, the material has a good electron transport function, and as an electron transport layer material, an organic electroluminescent device prepared from the material has the advantages of low driving voltage, high luminous efficiency and long service life, and can be widely applied to the field of organic electroluminescent devices. And meanwhile, the efficiency roll-off is small.

The utility model belongs to the technical field of injection molding products, and particularly relates to a cavity sound insulation block structure which comprises a PA framework and EVA polystyrene foam compounded on the surface of the PA framework, the PA framework is connected at a bending position through a PA bending buckle, the bending position of the PA bending buckle is preformed to form an included angle of 135 degrees, the wall thickness of the bending position is thinned, and the thickness of the PA bending buckle is reduced. And the connecting structure can adaptively block a bending section cavity between 90 degrees and 180 degrees of a vehicle body. According to the utility model, through the composite structure of the PA framework and the EVA polystyrene foam layer which are integrally extruded and molded, and in combination with the pre-molded 135-degree bending angle and the wall thickness reduction design, the sound insulation block can be self-adaptive to 90-180-degree bending requirements, and the application range of cavity section plugging is obviously widened.

The invention belongs to the technical field of organic electroluminescent materials, and particularly relates to a compound with a nine-ring side chain and an organic electroluminescent device.The series of compounds contain a large conjugate fragment and a benzo five-membered heterocyclic ring or five-membered heterocyclic ring structure, sulfur and other heavy atoms contained in the large conjugate fragment can improve the spin-orbit coupling capacity, and therefore the stability of the compound is improved. According to the invention, charge transfer in molecules is enhanced, so that a higher anti-intersystem crossing coefficient is achieved, efficient conversion of triplet excitons can be realized, and loss of the excitons is reduced; meanwhile, the compound structure has an extremely remarkable intramolecular distortion structure, molecular stacking is effectively reduced, annihilation of carriers and excitons is inhibited, triplet-state excitons can be converted more efficiently, combination of the excitons in a light-emitting layer is guaranteed through cooperation of the structures of all the parts, and the light-emitting efficiency is improved. Therefore, the comprehensive performance of the organic light-emitting device is improved.

The application relates to the technical field of furniture, and particularly discloses compound structure furniture based on Ming-style furniture, blue-and-white porcelain and blue calico techniques, which comprises a Ming-style furniture wood main body, blue-and-white porcelain pieces and blue calico; the blue-and-white porcelain pieces are inlaid on the Ming-style furniture wood main body through the hundred treasures inlay technique and modern techniques, the blue calico is laid on the Ming-style furniture wood main body, and the Ming-style furniture is traditional classical Ming-style furniture and modern Ming-style furniture. The Ming-style furniture wood main body is made of high-quality hardwood and is spliced into a seat or a wooden sofa through a mortise and tenon structure, the blue-and-white porcelain pieces are fired through traditional and modern processes, and the blue calico is processed into decorative pieces such as seat cushions and back cushions by using non-inheritance traditional and modern blue calico or technology cloth printed with traditional blue calico and modern blue calico patterns. The application forms a new manufacturing system by combining multiple non-inheritance techniques, solves the problems of related processes and technologies of traditional furniture decoration, has great aesthetic and practical values, and provides a practical path for the living inheritance of non-inheritance.

Provided is a weaving method for a double-warp and quadruple-weft jacquard fabric with double-weft color gradient expression. A combination of warps composed of a first warp J1 and a second warp J2 and a combination of wefts composed of a first weft W1, a second weft W2, a third weft W3, and a fourth weft W4 are used as implementation objects. Any two groups of wefts gradually develop colors on a fabric surface, and the other two groups of wefts do not develop color in the back of a fabric. Based on principle of double-layer weave configuration, warp and weft threads are used to establish structure models with double-weft color gradient expression, design a face coloring weave, design a back weave, design a relationship between a face layer and a back layer of fabric, design a compound weave process, design a digital pattern, and design a compound structure diagram.

The application discloses a polycyclic compound and an organic electroluminescent device containing the same. The compound structure is shown as formula I, which is a boron-nitrogen material with a planar structure. By introducing a bridged cycloalkyl group, the rigidity of the polycyclic compound is increased, and the introduction of a π electron-containing structure is reduced, so that the π-π mutual attraction in the molecule is minimized. The compound has similar molecular vibration modes and energy levels as existing boron-nitrogen materials, avoids the occurrence of red shift of the emission wavelength, and has a narrow emission spectrum and a half peak width. The compound is suitable for a blue host / dopant system in a blue series of AM-OLED and an organic electroluminescent device. The organic electroluminescent device containing the compound has a high external quantum efficiency, and the lifetime performance is particularly excellent.

The invention provides a nitrogen-containing compound-based anti-ultraviolet, anti-blue-light and flame-retardant copolyester and a preparation method and application thereof, the copolyester comprises structural units I and II and optional structural units III and IV, the structural unit III is selected from a specific nitrogen-containing compound structure, and the structural unit IV is selected from a phosphorus-containing compound structure; the copolyester is prepared by copolymerizing a nitrogen-containing compound monomer and / or a phosphorus-containing compound monomer and a polyester monomer through a direct esterification method or an ester exchange method, the copolyester has excellent ultraviolet resistance, blue light resistance and flame retardance, functional groups are embedded into a polymer main chain in a covalent bond mode, migration and precipitation of small molecule additives are effectively avoided, all components of the material are halogen-free, the material is environmentally friendly, and the copolyester is suitable for flame retardance and optical function modification of various high polymer materials.

The utility model provides a composite cat house, and relates to the technical field of composite cat houses, the composite cat house comprises two integral support frames, a composite structure is arranged on the integral support frames, the composite structure mainly comprises four L-shaped support materials, the four L-shaped support materials are fixedly connected on the two integral support frames, and the L-shaped support materials are fixedly connected on the two integral support frames. Three honeycomb paperboards are fixedly connected in the two L-shaped supporting materials jointly, a transparent plate is fixedly connected in the two L-shaped supporting materials jointly, a fish tank is arranged on the overall supporting frame located on the upper portion, a hollowed-out tunnel is formed in the fish tank, an inlet is formed in the transparent plate, a plurality of air holes are formed in the transparent plate, and the air holes are communicated with the hollow-out tunnel. Two elastic ropes are fixedly connected to the overall supporting frame, one end of each elastic rope is fixedly connected with an interesting ball, and the problem that most of existing cat nests have the function of being used by cats to sleep and rest, and recreational functional configuration relative to the cats is lacked is solved.

The application belongs to the technical field of metal materials, and particularly relates to a magnesium alloy for building and a preparation method thereof. The magnesium alloy for building comprises the following components in percentage by mass: Al: 2.6% to 3.4%, RE: ≤0.8%, Mn: 0.2% to 0.8%, Zn: 0.7% to 1.2%, and the balance of Mg and inevitable impurity elements; the inevitable impurity elements comprise Fe, Si, Cu and Ni, and the controlled contents are Fe: ≤0.003%, Si: ≤0.07%, Cu: ≤0.008% and Ni: ≤0.001%. The preparation method comprises the following steps in sequence: batching, melting, refining, casting, heat treatment, turning and hot extrusion. By optimizing the melting parameters, adopting solid solution heat treatment and a reasonable hot extrusion process, the magnesium alloy forms a fine crystal alpha-Mg matrix and a uniformly distributed intermetallic compound structure. The magnesium alloy has a tensile strength at room temperature of ≥240 MPa, an elongation after fracture of ≥20%, a neutral salt spray corrosion rate of ≤0.025 mg / (cm 2 2 / h), and significantly improved mechanical properties and corrosion resistance, and can be widely applied to the field of metal structure buildings.