327results about How to "Excellent mechanical properties" patented technology

The present invention provides a transparent inorganic oxide dispersion which makes it possible to improve the refractive index and mechanical characteristics and to maintain transparency by modifying the surface of inorganic oxide particles with a surface modifier having one or more reactive functional groups; and an inorganic oxide particle-containing resin composition in which the transparent inorganic oxide dispersion and a resin are compositely integrated by the polymerization reaction, a composition for sealing a light emitting element, a light emitting element, and a method for producing an inorganic oxide particle-containing resin composition; and a hard coat film which has high transparency and makes it possible to improve a refractive index and tenacity, an optical functional film, an optical lens and an optical component. The transparent inorganic oxide dispersion of the present invention comprises inorganic oxide particles which have a surface modified with a surface modifier having one or more reactive functional groups and have a disperse particle diameter of 1 nm or more and 20 nm or less, and a disperse medium, wherein the surface modifier is one or more kinds selected from the group consisting of a silane coupling agent, a modified silicone, and a surfactant.

The invention relates to a preparation method of a high-performance carbon nanotube fiber, which comprises the following specific steps of: drawing a carbon nanotube film from a spinning carbon nanotube array; then, immersing the carbon nanotube film in a thermosetting polyamic acid/N-methyl pyrrolidone solution, and twisting to form a carbon nanotube/polyamic acid composite fiber; subsequently, curing the carbon nanotube/polyamic acid composite fiber so that polyamic acid in the composite fiber forms polyimide with a net type crosslinking structure; and finally preparing the carbon nanotube/polyimide composite fiber. The invention has the advantages of simple and easy process, low cost and easy realization of large-scale production; moreover, the prepared carbon nanotube composite fiber has excellent mechanical performance, the strength can reach 2.06 GPa, the tenacity is superior to that of carbon fiber, and the conducting property is maintained unchanged as compared with that of pure carbon nanotube fiber; meanwhile, the carbon nanotube composite fiber also has the operability of common yarn, so that the requirements on subsequent treatment processes of stretching, stranding, weaving and the like can be satisfied.

The invention belongs to the technical field of photo-electronics, and more specifically relates to a low-roughness and low-square-resistance flexible transparent conductive composite thin film, wherein the thin film adopts a three-layer composite structure; the lowest bottom layer is provided with a transparent polymer thin film; the middle layer is provided with a conductive network formed by metal nanowires; the topmost layer is a provided with a transparent conductive layer which uniformly covers the transparent polymer thin film and the conductive network; the flexible transparent conductive composite thin film is less than 20-nanometer in average roughness, less than 30-ohm/square meter in square resistance, and greater than 80% of light transmittance within a visible light range; and the transparent conductive thin film can bear bending with radius of curvature of 2mm. The invention also discloses a preparation method for the flexible transparent conductive composite thin film. The flexible transparent conductive composite thin film provided by the invention has low roughness, high conductivity, high light transmittance, simple preparation method and low cost, and is particularly suitable for flexible display and illumination, a flexible solar battery and flexible touch equipment.

A lightweight fiber-reinforced composite material that exhibits excellent flame resistance and mechanical properties and does not emit any halogen gas at combustion; an epoxy resin composition and prepreg suitable for obtaining the above fiber-reinforced composite material; and an integrated molding suitable to electrical/electronic equipment cabinet, in which use is made of the above fiber-reinforced composite material. There is provided an epoxy resin composition for carbon-fiber-reinforced composite material, comprising: [A] epoxy resin, [B] amine curing agent, and [C] phosphorus compound, the component [C] contained in an amount, in terms of concentration of phosphorus atoms, of 0.2 to 15 wt.%.

A wood-plastics shuttering board for building engineering is composed of at least two basic wood-plastic ply layers made of the filler (vegetative fibers, glass fibers and plastics) and assistant (calcium carbonate, modifier, coupling agent and lubricant), and at least one lattice material layer between two basic wood-plastic ply layers and with two adhesive layers coated on its both surfaces. Its manufacture technology is also disclosed.

The invention discloses acrylate grafted aqueous polyurethane emulsion and a preparation method thereof. The emulsion is characterized is prepared from polyether polyol, dimethylol propionic acid, isophorone diisocyanate, ethylenediamine, hydroxyethyl acrylate and the like. The preparation method comprises the following steps: carrying out prepolymerization on polyether polyol, dimethylol propionic acid and isophorone diisocyanate so as to introduce a hydrophilic monomer; adding ethylenediamine and hydroxyethyl acrylate to carry out chain extension so as to introduce a functional monomer; adding an acrylate mixed monomer so as to reduce system viscosity; adding triethylamine for neutralization; adding deionized water for emulsification and dispersion under the condition of high-speed shearing to obtain emulsion; then dropwise adding the acrylate mixed monomer and an initiator, raising the temperature and carrying out reaction; and cooling to obtain the PUA (polyurethane-acrylate) emulsion. The emulsion prepared by the method has small grain size and excellent performances such as mechanical performance, is narrowly distributed and can be widely applied to industry fields such as leather finish, coatings, adhesives and fabric coatings.

The invention provides a low-temperature SCR (Selective Catalytic Reduction) catalyst based on an active coke loaded active component and a preparation method of the low-temperature SCR catalyst. The catalyst is suitable for SCR reaction of nitrogen oxides under the condition of low temperature. A Mn and Ce composite oxide is loaded on an active coke particle with a relatively high special surface area and mechanical strength, so that the SCR reaction temperature is reduced, the adsorption capability and mechanical wear resistance of the catalyst are improved, and the whole sulfate resistance and regeneration capability of the catalyst are improved. The preparation method provided by the invention is simple in step, artful in process design and convenient for industrial production. The catalyst provided by the invention takes the active coke particle as a carrier on which the Mn and Ce composite oxide is loaded. Oxides of modified elements can also be loaded on the carrier of the catalyst, wherein the modified elements are selected from one or more of the following elements: Fe, Zr, Si, Ti, V, Mo, W, Cr, Au, Ag, Pt, Pd, Rh and Co.

Disclosed are a curable silicone resin composition, a cured product thereof, and the opaque silicone adhesive sheet formed from the conposition. The curable silicone resin composition is solid at roomtemperature, the composition including: (A) an organopolysiloxane having a resin structure consisting of specific siloxane units, (B) an organohydrogenpolysiloxane having a resin structure consistingof specific siloxane units, (C) a platinum group metal-based catalyst, (D) either one or both of an opaque pigment and an opaque dye, and (E) a reaction retarder, in which a layer of thickness 100 [mu]m formed from a cured product of the composition exhibits a light transmittance of not more than 5% across the entire visible light range. The composition is solid at room temperature and thereforeeasy to handle. Further, the composition is useful for producing an opaque silicone adhesive sheet. A cured product obtained by curing the composition can be used to protect a liquid crystal electrodeand shield the electrode from light, thereby preventing malfunction of the driver IC, and also exhibits excellent mechanical properties and flexibility, and displays minimal surface tack.

The invention relates to a self-floating composite material bridge pressurized-water anti-collision device. The anti-collision device is characterized by comprising a shell part (12) and a water-spraying energy-consumption part (13), wherein the water-spraying energy-consumption part (13) is arranged by clinging to the bridge; the shell part (12) is arranged outside the water-spraying energy-consumption part (13); the shell part (12) consists of a composite material surface layer (1), a sandwich material layer (2) and a filling material body (3); the sandwich material layer (2) is clamped in the composite material surface layer (1) and forms a shell wall (14); the filling material body (3) is filled in space formed by the shell wall (14); the water-spraying energy-consumption part (13) consists of a canvas water bag (6) filled with water (10), a circle of transverse frameworks (8) which is arranged at a regular interval along the transverse direction of the canvas water bag (6) and longitudinal framework (9) which is arranged along the longitudinal direction of the water bag; the canvas water bag (6) is provided with draining holes (7) regularly; and the shell part (12) is also provided with a rail (11). The anti-collision device has the advantages of simple structure, convenient manufacture, installation and maintenance, low cost and environmental protection.

An electrical plug for a cable with an inner conductor, an outer conductor and insulation between the inner conductor and the outer conductor, for transmitting electrical drive power for a motor vehicle between the cable and a plug receptacle, comprises a housing, which surrounds a plug-in area, in the which the plug may be connected with the plug receptacle, and a cable area, in which the cable may be connected to the plug. An insulator sleeve of an electrically insulating material surrounds in the manner of a jacket a channel extending from the plug-in area to the cable area, into which channel an inner conductor element connected with the cable may be introduced from the cable area. A support sleeve surrounds the insulator sleeve in the manner of a jacket, is connected mechanically with the insulator sleeve in the plug-in area and is connected mechanically with the housing in the cable area. An outer conductor element connected with the cable may be introduced into a first cavity between the insulator sleeve and the support sleeve. A shield element of a plug receptacle may be introduced into a second cavity, which surrounds the support sleeve in the plug-in area.

A cleaning blade member for use in a cleaning section for removing toner on a toner-deposited body, the cleaning blade member comprising: an edge layer contacting the toner-deposited body; and a back layer provided on a back side of the edge layer, and wherein the edge layer has a Young's modulus of 8 to 20 MPa and an impact resilience at 25° C. of 20 to 40%, and when the Young's modulus of the edge layer is designated as E_a, a Young's modulus of the back layer is designated as E_b, a thickness of the edge layer is designated as T_a, and a thickness of the back layer is designated as T_b, a ratio (R_b/R_a) between a contribution rate R_a of the Young's modulus of the edge layer represented by the following equation (1), and a contribution rate R_b of the Young's modulus of the back layer represented by the following equation (2) is 0.01 to 6.0, and a total Young's modulus (R_a+R_b) of the edge layer and the back layer is 7 to 14 MPa:

R_a=[T_aE_a/(T_a+T_b)]  (1)

R_b=[T_bE_b/(T_a+T_b)]  (2)

The invention discloses an FRP (fiber reinforced plastic) optical fiber intelligent composite rib embedded with a steel strand, which belongs to the technical field of safety monitoring and structural materials and is characterized in that the steel strand and the optical fiber or a fiber bragg grating are parallelly embedded in the FRP rib along the length direction of fiber resin and are organically integrated through a pultrusion process, wherein the steel strand is embedded in the middle of the FRP rib, the optical fiber or the fiber bragg grating is embedded at the outer side of an FRP covering; or the optical fiber or the fiber bragg grating is embedded in the middle of the FRP rib, and the steel strand is embedded at the outer side of the FRP covering. The FRP optical fiber intelligent composite rib has the effects and advantages that the optical fiber intelligent composite rib has high modulus, good durability and self-sensing property, and can be widely applied to projects of bridge stay cables and booms and the like as a novel material in civil engineering and a sensing element for long-time monitoring.

The invention provides a metal resin integrated forming method which comprises the following steps: A. metal surface treatment: forming nanopores on a metal surface; and B. melting a thermoplastic resin on the metal surface on which the nanopores are formed, and directly carrying out integrated injection forming, wherein the thermoplastic resin is a blend containing a main body resin and a polyolefin resin, the main body resin is a mixture of polyphenylether and polyphenyl thioether, and the melting point of the polyolefin resin is 65-105 DEG C. The invention also provides a metal resin composite prepared by the method. By adopting the noncrystalline main body resin with better surface gloss and toughness in cooperation with the polyolefin resin with the melting point of 65-105 DEG C, the metal resin integrated forming method provided by the invention ensures that the obtained metal resin composite has better mechanical strength and surface treatment characteristic, thereby solving the problem in surface decoration of plastic parts and satisfying the diversified demands of the customers.

The invention relates to an ultrasonic oval vibrating mechanism for assisting a diamond cutter in ultra-precision cutting. The ultrasonic oval vibrating mechanism is characterized by comprising a cutter handle, a vibrating unit and a cutter, wherein one end of the cutter handle has a step-shaped structure; the vertical surfaces and the horizontal surfaces of an upper layer step and a lower layer step are provided with grooves; the vibrating unit comprises a vibrating body consisting of a transverse vibrating rod and a longitudinal vibrating rod which are vertical to each other; the top surface of the joint of the transverse vibrating rod and the longitudinal vibrating rod is provided with a groove; the end part of the transverse vibrating rod is provided with a transverse end face; the other side of the transverse end face is provided with a transverse excitation source and a transverse cover plate in sequence; the end part of the longitudinal vibrating rod is provided with a longitudinal end face; the other side of the longitudinal end face is provided with a longitudinal excitation source and a longitudinal cover plate in sequence; the transverse end face is formed on the vertical surface of the upper layer step of the cutter handle; the transverse cover plate and the transverse excitation source are positioned in the groove of the upper layer step; the longitudinal end faceis formed on the horizontal surface of the lower layer step of the cutter handle; the longitudinal cover plate and the longitudinal excitation source are positioned in the groove of the lower layer step; and the cutter is arranged in the groove at the joint of the transverse vibrating rod and the longitudinal vibrating rod.

The invention relates to a bridge anti-collision device of a composite material, which is characterized in that the bridge anti-collision device of the composite material is in a bar-shaped structure or an annular structure which is matched with the shape of a bridge, wherein the bar-shaped or annular structure is at least provided with an anti-collision unit (10) or at least comprises one anti-collision unit (10) and one connecting rod (12). The two adjacent anti-collision units (10) which are mutually connected are connected by a flange (4) and a bolt (5), and the connecting rods (12) are installed at both ends of one anti-collision unit (10) or are installed between the two anti-collision units (10) which are adjacent but not connected with each other so as to form the annular structure; each anti-collision unit (10) comprises a casing (11), a filling material (3) filled in the casing (11) and a canvas bag (7) which is installed at one side of the casing and is filled with a buffering material (6), the canvas bags (7) are connected with the casings (11) by pull ropes (8), anti-collision handrails (9) are also connected on the casings (11), and the casings (11) are also solid casings of the composite material or are in a structure comprising two layers of internal and external composite material surface layers (1) and a sandwich material (2). The invention has low cost, good anti-collision performance, greenness and environmental protection.

The invention provides a metal resin integrated forming method which comprises the following steps: A. metal surface treatment: forming nanopores on a metal surface; and B. melting a thermoplastic resin on the metal surface on which the nanopores are formed, and directly carrying out integrated injection forming, wherein the thermoplastic resin is a blend containing a main body resin and a polyolefin resin, the main body resin is a mixture of polyphenylether and polyamide, and the melting point of the polyolefin resin is 65-105 DEG C. The invention also provides a metal resin composite prepared by the method. By adopting the noncrystalline main body resin with better surface gloss and toughness in cooperation with the polyolefin resin with the melting point of 65-105 DEG C, the metal resin integrated forming method provided by the invention ensures that the obtained metal resin composite has better mechanical strength and surface treatment characteristic, thereby solving the problem in surface decoration of plastic parts and satisfying the diversified demands of the customers.

The invention relates to self-repairing polyurethane and a preparation method thereof. Raw materials of the self-repairing polyurethane mainly comprise dioxime. The polyurethane provided by the invention has good mechanical properties and excellent self-repairing properties; and the preparation method is simple, and has low costs and good market application prospects.

The invention provides a self-cleaned cement based composite material with high toughness. The preparation method comprises the following steps: adding cement, fine aggregates, coal ash, silicon ash, pelletized blast furnace slags, metakaolin and nano titanium dioxide into a stirrer, and stirring to prepare dry powder; then, adding water and a water reducing agent to prepare slurry; finally, adding a certain amount of short fibers to finally obtain the self-cleaned cement based composite material with high toughness. The self-cleaned cement based composite material not only has good anti-tension and anti-crack characteristics, but also has the self-cleaning function. The self-cleaned cement based composite material can be widely applied to the fields of house building, road and bridge projects, national defense construction and the like and is remarkable in social and economical benefits.

An oxidation resistant carbon fiber reinforced carbon composite material comprises a matrix and 20 volume % or more of carbon fibers, and is characterized in that: the matrix contains ceramic powder that includes boron carbide powder having an average particle diameter of 5 μm or less; and an amount of the ceramic powder is 32 volume % or more based on volume of the carbon fibers.

Aiming to solve the problems that harm to human health is caused due to drinking of underground water with high nitrate content and that an existing carbon source material in use has the defects of poor controlled release effect, easiness in causing secondary pollution, easiness in collapse and the like during application, the invention discloses a preparation method of controlled-release carbon source composite particles for use in biological nitrogen removal by denitrification. Solid-phase controlled-release carbon source composite particles can be taken as a filling medium in in-situ or ex-situ remediation of underground water nitrate pollution. When the solid-phase controlled-release carbon source composite particles are taken as a denitrification bacteria carrier, long-acting controllable organic carbon source release is provided. A degradable polymer and a natural plant are taken as carbon source releasing components, and a non-degradable polymer is taken as a framework material, so that a preparation process is relatively simple, and high mechanical performance and high efficiency of nitrogen removal by denitrification are achieved.

The invention discloses a single-piston-rod damper and belongs to the technical field of structural vibration control devices. The single-piston-rod damper comprises a cylinder which is divided into a working chamber and a compensation chamber, the working chamber and the compensation chamber are separated from each other through a floating piston which is sealed together with the cylinder, and the working chamber is filled with shear thickening fluid (STF); one end, with the tip being connected with a working piston, of the piston rod is arranged in the working chamber in the cylinder, and the other end of the piston rod is arranged outside the cylinder and connected with an upper connecting part; and an elastic part is arranged in the compensation chamber, one end of the elastic part is connected with the floating piston, and the other end of the elastic part is connected to a rubber piston arranged at the end of the cylinder. When the shearing rate is high and the instantaneous vibration velocity in the working chamber is high, shear thickening of the STF occurs to generate damping force, so that the anti-impact vibration-reduction effect of engineering structures is achieved; and when the shearing rate is low and the instantaneous vibration velocity in the working chamber is low, the elastic part in the compensation chamber elastically compensates for the initial rigidity of the damper, so that vibration reduction and energy dissipation of the engineering structures are achieved. The single-piston-rod damper is provided with the elastic compensation chamber to provide appropriate compensation rigidity, and the anti-impact vibration-reduction effect of the damper is achieved.

A vehicle includes at least one polyoxymethylene structural support member. The polyoxymethylene structural support member includes a polyoxymethylene component that is a propellant that provides thrust to the vehicle upon pyrolysis or combustion of the polyoxymethylene component of the product of pyrolysis of the polyoxymethylene component. The vehicle can be a satellite or other type of spacecraft.

The invention discloses a new truss-type satellite main structure public platform, which consists of a star-shaped central load-bearing frame (1), a bottom plate (2), a pair of ±Y-directed side plates (3) parallel to each other, and a pair of ±X-directed The side plate (4) is composed of; the star-shaped central bearing frame (1) includes the star-arrow docking ring (11), one X-direction W-shaped plane truss (12) and two symmetrically distributed Y-direction W-shaped plane trusses (13 ); 3 W-shaped plane trusses are star-shaped, i.e. distributed in a * shape, connected as a whole and connected to the side plates respectively; 3 W-shaped plane trusses are connected to the star arrow docking ring (11) through the bottom outer joint (129); The bottom plate (2) is connected with the star arrow docking ring (11) at the position of the opening in the middle. The platform of the present invention meets the satellite layout requirements while ensuring a reasonable force transmission path, can carry various types of payload compartments (or modules), and is suitable for use when the weight of the entire satellite exceeds 6 tons and the diameter of the storage tank is greater than 1 meter.

A method for producing a metal forged product having a plurality of branches includes a preliminary forging step of forming a preform by closed forging from a cylindrical material (301) having a surface layer (302) on a circumferential surface thereof such that the surface layer is contained in a surface region of the preform; an intermediate forging step of subjecting the preform to forging to thereby extrude the surface layer in the form of flash outside a periphery of a forged product corresponding to a target product; a final forging step of forging the forged product into a product assuming a target product shape; and a flash removal step of removing the flash containing the surface layer from the product assuming a target product shape to thereby produce a target forged product. The forged product is enhanced in mechanical characteristics and has no flash removal mark. Since the cylindrical material having a surface layer on a circumferential surface thereof is used, the power required for the steps can be reduced to enhance the yield of the products on the basis of the forging material.

The invention provides a metal resin integrated forming method which comprises the following steps: A. metal surface treatment: forming nanopores on a metal surface; and B. melting a thermoplastic resin on the metal surface on which the nanopores are formed, and directly carrying out integrated injection forming, wherein the thermoplastic resin is a blend containing a main body resin and a polyolefin resin, the main body resin is polycarbonate, and the melting point of the polyolefin resin is 65-105 DEG C. The invention also provides a metal resin composite prepared by the method. By adopting the noncrystalline main body resin with better surface gloss and toughness in cooperation with the polyolefin resin with the melting point of 65-105 DEG C, the metal resin integrated forming method provided by the invention ensures that the obtained metal resin composite has better mechanical strength and surface treatment characteristic, thereby solving the problem in surface decoration of plastic parts and satisfying the diversified demands of the customers.

A closed forging method for producing a forged product includes preparing as a forging material a cylindrical cast ingot that has a volume the same as the volume of a forged product and assumes a shape having an upper surface, a lower surface and a side surface and containing no angular portion; and applying pressure to the side surface of the forging material. The shape has a ratio of the lateral length of a projection profile of the forging material as viewed in the direction perpendicular to the direction of pressure application to a length of the forging material as measured in the direction of pressure application is 1 or less. The forged product obtained is a preform of an upper arm or a lower arm with a plurality of branches that is a suspension part for a vehicle or a yoke with a plurality of branches that is a joint part employed in a vehicle suspension. The preform or yoke has metal flow lines along each branch and exhibits enhanced mechanical strength.

The invention relates to a high-end bearing steel material for a machine tool and a production process of the high-end bearing steel material, and belongs to the technical field of special steel smelting. The high-end bearing steel material for the machine tool and the production process of the high-end bearing steel material aim to solve the problem that the properties such as wear resistance and contact fatigue strength of an existing bearing steel material cannot meet the requirements of a high-end numerical control machine tool, and the production process comprises electric furnace treatment, LF refining and VD process, die casting, hot delivery/cover cooling, primary heating rolling cogging, slow cooling, secondary heating rolling and spheroidizing annealing. Ni, Mo and rare earth elements are added on the basis of existing bearing steel, the content of Al and Cu is strictly controlled, and a good mechanical property index is provided for steel materials, and the produced bearing steel material has high elasticity limit, tensile strength, contact fatigue strength and wear resistance, can effectively reduce the phenomena of material fatigue flaking, clamping and the like and is applicable to manufacturing a bearing ring and a rolling body and needle with the wide size range for the machine tool.

The invention relates to a surface bioactive calcium-phosphate layer of a carbon fiber reinforced polyetheretherketone composite material and preparation thereof. The three-dimensional braided carbon fiber reinforced polyetheretherketone composite material which is molded through hot-press is ground, polished and subjected to alkaline liquor treatment, complex activating treatment, plasma treatment or ion implantation pretreatment to ensure that the surface of the composite material has activity; and the sample subjected to the pretreatment is immerged in a simulated body fluid for biomimetic mineralization. The depth of the calcium-phosphate layer is 4 to 10 microns and the atomic ratio of the calcium to the phosphate of the calcium-phosphate layer is 1:1-1.5. The surface bioactive calcium-phosphate layer of a carbon fiber reinforced polyetheretherketone composite material and the preparation thereof have the following advantages that: the process is simple; and through the treatment by the method, the composite material has excellent mechanical properties (high shocking and bending strength and modulus near bones), and also has good surface bioactivity so that the composite material as a new bone implant has better therapeutic effect.

Disclosed is a heat-resistant Ti alloy material excellent in high-temperature corrosion resistance and oxidation resistance, which comprises a base made of a heat-resistant Ti alloy and a surface layer formed on the surface of the base. The surface layer has a multilayer structure including an inner layer and an outer layer. The inner layer has three coexistent phases consisting of a β phase, a γ phase and a Laves phase in the phase diagram of a Ti—Al—Cr based alloy, and the outer layer is made of an Al—Ti—Cr based alloy having an Al concentration of 50 atomic % or more. The heat-resistant Ti alloy material is produced by subjecting a substrate made of a heat-resistant Ti alloy to a Cr diffusion treatment at a temperature within a β single-phase region in the phase diagram of a Ti—Al—Cr based alloy, precipitating a γ phase and a Laves phase from the β phase during a cooling process to form the inner layer with three coexistent phases consisting of the β, γ and Laves phases, and then subjecting the obtained product to an Al diffusion treatment to form the outer layer. The heat-resistant Ti alloy material can prevent the diffusion of Al from the outer layer to the base and the diffusion of elements of the base to the outer layer while forming a protective Al₂O₃ film in a self-repairing manner, to provide excellent high-temperature corrosion resistance and oxidation resistance to the heat-resistant Ti alloy base.

The invention discloses a flexible gas sensing device based on a three-dimensional net sensitive film and a preparation method of the flexible gas sensing device, and belongs to the fields of sensing electronics and flexible electronics. The sensing device comprises a flexible substrate layer, an interdigital electrode layer and a three-dimensional net structured sensitive film layer which are sequentially stacked according to the preparation order. The preparation method mainly comprises steps as follows: preparing a flexible interdigital electrode device, preparing a film material required by the sensing device, and preparing a three-dimensional net structured sensitive film device with a gas injection film forming technology. The flexible gas sensing device based on the three-dimensional net sensitive film and the preparation method of the flexible gas sensing device have the advantages as follows: by means of the extensibility of the flexible substrate on the three-dimensional net structured sensitive film, the response performance of the sensitive film on gas is further improved, meanwhile, the process is simple, the cost is low, and the prepared sensing device can be used in the field of gas detection.