139 results about "Nanodiamond" patented technology

The invention relates to the technical field of grinding fluid, in particular to efficient grinding fluid for an MPO connector, a preparation method and application of the efficient grinding fluid for the MPO connector. 27%-44% of alpha-aluminum oxide; 8%-15% of a styrene-maleic anhydride copolymer; 2%-5% of a modified polyurea solution; 0.05% to 0.3% of perfluoropolyether; 0.5%-2% of citric acid; 0.5%-1.5% of a polyether modified polysiloxane defoaming agent; by adopting a composite abrasive material system of the nano-diamond and the alpha-aluminum oxide, the grinding efficiency and the surface quality are improved in a breakthrough manner.

The invention relates to the technical field of superhard materials, and particularly discloses a polycrystalline diamond compact and a preparation method and application thereof.The preparation method of the polycrystalline diamond compact comprises the following steps that WC-Co alloy powder is sintered to obtain a hard alloy matrix; uniformly mixing nano diamond powder, micron diamond powder and cubic boron nitride, adding a reinforcing agent and a binding agent, and uniformly mixing to obtain a polycrystalline diamond layer mixture; the reinforcing agent is a nitrogen-boron doped graphene bonded amino carbon nanotube; a gradient transition layer raw material and a polycrystalline diamond mixture are uniformly spread on the surface of the hard alloy matrix in sequence, and then a composite blank is obtained through mold pressing; and sintering the composite blank to obtain the polycrystalline diamond compact. Graphene and carbon nanotubes are compounded to form a reinforcing agent with a three-dimensional network structure, so that the strength and wear resistance of the material are improved, and the service life of the material under harsh working conditions is prolonged.

The invention discloses an enhanced multi-network hydrogel electrolyte as well as a preparation method and application thereof, and belongs to the field of aqueous zinc ion batteries. Firstly, oxygen terminal nano-diamond is uniformly dispersed in deionized water to form a mixed solution, then sodium alginate is added to be fully dissolved, and the mixed solution is uniformly dispersed; the oxygen terminal nano-diamond-sodium alginate homogeneous solution is obtained. The solution is mixed with a polyvinyl alcohol solution which is completely molten through water bath heating and a proper amount of glycerol, and all the components are ensured to be uniformly distributed through sufficient stirring. And then, through repeated freezing and thawing and zinc ion cross-linking and curing effects, the oxygen terminal nano-diamond enhanced hydrogel electrolyte with a multi-network structure is finally formed. The oxygen terminal nano-diamond is highly uniformly dispersed in the hydrogel electrolyte, dendritic crystal growth and side reaction are effectively inhibited through a triple synergistic mechanism of enhancing the mechanical strength, reducing the free water content and increasing the zinc ion transference number by surface functional groups, and the super-long cycle stability is achieved.

The invention discloses a preparation method of a modified graphite / copper composite heat sink material, and belongs to the technical field of metal-based composite materials. The method comprises the following steps: carrying out acid activation on crystalline flake graphite, modifying the crystalline flake graphite with a silane coupling agent, and selectively stripping to obtain graphite nanosheets; preparing copper-based alloy powder containing at least two carbides of Zr, Cr and Ti; performing graded ultrasonic-ball milling composite dispersion on the surface modified graphite powder, the copper-based alloy powder, the nano-diamond powder, the carboxyl functionalized multi-walled carbon nanotubes and the graphene oxide; gradient filling cold pressing forming and pre-sintering are carried out; performing hot pressing / spark plasma sintering, applying a magnetic field or a vibration field to realize graphite orientation, generating a carbide interface transition layer in situ, and reducing graphene oxide; and after machining, pulse electrodeposition is carried out on the copper-graphene composite coating, and surface micropores / micro textures and phase change material filling can be selectively formed. The method is suitable for efficient heat management of high-power electronic devices.

This invention provides a highly efficient method for separating or concentrating lattice defect-containing nanoparticles (NDs). [Solution] A method for separating or concentrating lattice defect-containing ND particles, comprising irradiating a dispersion containing at least two types of ND particles selected from nanodiamond (ND) particles having at least one type of lattice defect and ND particles without the lattice defect with at least one type of excitation laser light having an energy greater than or equal to the resonance absorption energy of the lattice defect and at least one type of stimulated emission laser light, thereby selectively moving the ND particles having the lattice defect by the absorption optical pressure generated by the absorption of at least one type of excitation laser light and the stimulated recoil force generated by the action of at least one type of stimulated emission laser light, wherein the excitation laser light transitions electrons in the ground state of the ND particles to an excited state, and the stimulated emission laser light transitions electrons in the excited state to the ground state faster than spontaneous emission to generate stimulated recoil force.

The application discloses a surface strengthening method suitable for low-temperature steel friction pairs of polar ship with complex configuration, and aims at solving the problems of insufficient surface wear resistance of the friction pairs and difficulty in surface strengthening in the existing polar ship with complex configuration.The surface strengthening method of the low-temperature steel friction pairs comprises the following steps: firstly, polishing and ultrasonic cleaning are conducted on the low-temperature steel friction pair materials; secondly, nano-diamond particle powder and spherical hard ceramic particles are mixed by ball milling; thirdly, a nickel-based plating solution is prepared; fourthly, supersonic particle bombardment treatment is conducted on the surface of the clean friction pair materials; fifthly, a nickel-based plating layer is prepared by adopting a chemical plating or brush plating process; sixthly, the step four and the step five are repeated for multiple times; seventhly, a composite plating solution is prepared; and eighthly, a self-lubricating coating is prepared.The application prepares a multilayer composite structure coating comprising a hardening layer, an alloy layer and a self-lubricating layer, the coating has good combination performance, high hardness and wear resistance, and is suitable for the low-temperature steel friction pairs of the polar ship with complex configuration.

This invention relates to the field of heat dissipation technology, and more particularly to an optimization method and apparatus for a nanodiamond-copper gradient composite heat dissipation structure. The invention comprises the following steps: Step 100: Determining a three-dimensional geometric model of the nanodiamond-copper gradient composite heat dissipation structure based on its initial geometric parameters; Step 102: Assigning preset material properties to the three-dimensional geometric model to obtain a simulation model of the nanodiamond-copper gradient composite heat dissipation structure; Step 104: Determining the thermal conductivity of the nanodiamond-copper gradient composite heat dissipation structure under the initial geometric parameters based on the simulation model; Step 106: Updating the initial geometric parameters and repeating steps 100-106 until the optimization objective of the objective function is greater than a first preset value, thus obtaining the optimal geometric parameters. In this way, the invention can improve the heat dissipation performance of the nanodiamond-copper gradient composite heat dissipation structure.

This invention discloses a wire drawing die polishing paste and its preparation process. The polishing paste comprises the following components: 25-40% composite abrasive, 3-8% modified dispersant, 5-12% elastic binder, 2-6% lubricant, 1-4% polishing aid, and the balance being deionized water. The composite abrasive is composed of nano-diamond powder and boron carbide powder in a mass ratio of (1-3):1. This invention utilizes a composite abrasive of nano-diamond and boron carbide, which improves polishing efficiency and precision. The use of the modified dispersant significantly enhances the dispersion stability of the composite abrasive, reduces abrasive agglomeration, and ensures polishing uniformity. The use of the elastic binder reduces surface damage to the wire drawing die, extending its service life. The preparation process of this invention ensures full fusion of the components, thereby allowing precise control of the particle size distribution of the polishing paste, removing air bubbles and impurities, and significantly improving the stability and service life of the polishing paste.

This invention belongs to the field of superhard material synthesis technology, specifically disclosing a high-temperature, high-pressure preparation method for nano-polycrystalline diamond with synergistic mechanical and thermal properties. The method includes the following steps: precursor preparation: pre-pressing the precursor in a cemented carbide mold; octahedral assembly; wrapping the pre-pressed sample with platinum foil and placing it at the center of the octahedron; high-temperature, high-pressure sintering; stopping heating after heat preservation, allowing it to cool naturally to 23-25°C, then depressurizing, removing the octahedral assembly and the platinum foil wrapping, thus obtaining the synergistically enhanced nano-polycrystalline diamond. This invention employs the above-mentioned high-temperature, high-pressure preparation method for nano-polycrystalline diamond with synergistic mechanical and thermal properties. By combining nanodiamond powder with graphene, the sample assembly is optimized, and nano-polycrystalline diamond samples with excellent mechanical properties and significantly improved thermal conductivity are synthesized under relatively mild temperature and pressure conditions.

The invention relates to the technical field of polymer composite materials, in particular to a PTFE microwave composite dielectric substrate based on core-shell structure filler and a preparation method of the PTFE microwave composite dielectric substrate. The preparation method comprises the following steps: uniformly coating nano-diamond on the surfaces of hollow silicon dioxide microspheres by adopting an electrostatic self-assembly method to form a core-shell filler, then mixing the core-shell filler with polytetrafluoroethylene emulsion, and preparing the microwave composite dielectric material through calendaring molding and vacuum hot pressing methods. The nano-diamond shell layer can construct a continuous heat conduction network, and meanwhile the low dielectric constant characteristic brought by an internal hollow silicon dioxide structure is kept. In addition, the nano-diamond endows the hollow silicon dioxide microspheres with rough surfaces, and interface bonding between the hollow silicon dioxide microspheres and a polytetrafluoroethylene matrix is enhanced, so that thermal expansion is remarkably inhibited. The invention provides an effective way for solving the contradiction between the dielectric property and the thermal property of the polytetrafluoroethylene-based microwave composite dielectric material.

This invention relates to the field of cutting fluids, particularly to a biomimetic self-healing nanocomposite cutting fluid and its preparation method. The cutting fluid is composed of the following components by mass percentage: 5-10% lubricant, 2-5% extreme pressure anti-wear agent, 0.1-2% nanofunctional agent, 1-3% surfactant, 1-2% corrosion inhibitor, 0.5-1.5% pH stabilizer, 0.1-0.5% defoamer, 0.1-0.5% corrosion inhibitor, and the remainder being deionized water. This invention creatively introduces nanofunctional agents such as MXene and nanodiamond. These nanomaterials can form a high-strength, low-friction penetrating layer and repair film on the tool surface. During cutting, they actively fill the microscopic defects caused by tool wear, thereby achieving a "self-healing" effect. This characteristic can significantly reduce the coefficient of friction and cutting force between the tool and the workpiece, and tests have shown that it can extend tool life by more than 50%.

The invention relates to the technical field of synthesis of organic chemical raw materials, in particular to an atomic-scale dispersion Ru catalyst which comprises a carrier and an active metal component, and the active metal component is ruthenium, is loaded on the surface of the carrier in an atomic-scale dispersion ruthenium cluster form and is combined with defects or vacancies on the surface of the carrier; wherein the carrier is a nano-diamond / graphene composite material with a core-shell structure, the composite material takes nano-diamond as a core and takes graphene rich in defects as a shell to form a carbon core and carbon shell hybrid core-shell structure, the nano-diamond / graphene composite material with a unique core-shell structure is preferably adopted as the carrier, and the nano-diamond / graphene composite material with the unique core-shell structure is used as the carrier; the hybrid diamond core provides excellent mechanical and thermal stability, while the hybrid graphene shell layer is rich in edge defects and vacancies that provide ideal, high density anchoring sites for the Ru species.

Provided is a nanodiamond dispersion composition having excellent dispersibility of nanodiamond particles in an organic dispersion medium. A nanodiamond dispersion composition including an organic dispersion medium, nanodiamond particles dispersed in the organic dispersion medium, and a fatty acid ester dispersing agent, the nanodiamond particles being surface-modified by a surface-modifying group or compound containing an organic group. The fatty acid ester dispersing agent preferably has a mass loss rate of 30% or less when held in an air atmosphere at a temperature of 200° C. for 180 minutes.

The invention discloses a preparation method of a fine structure surface RB-SiC friction pair based on throttling expansion self-suction type multiphase jet flow, and aims to solve the technical problems of poor uniformity and easy generation of microcracks in fine machining of an RB-SiC material. According to the method, negative pressure is formed through the throttling expansion effect generated when micron diamond gas jet flows through a Laval nozzle, nano diamond slurry with the shear thinning characteristic is automatically sucked in, and cell type diamond cluster abrasive multiphase jet is formed through online mixing; when the surface of a workpiece is impacted, grinding material clusters are depolymerized, uniform fragile region erosion of the material is achieved through the micron diamond, flexible finishing is conducted by means of ploughing and micro-cutting effects of the nano diamond, and therefore generation of micro cracks is synergistically inhibited. And in combination with a mask plate technology, the preparation of the high-quality fine structure surface is finally realized. Through the synergistic effect of multi-phase jet flow online mixing and cell type grinding materials, the quality of the machined surface is remarkably improved, and the method is suitable for preparing the high-performance RB-SiC friction pair.

The application relates to the technical field of ball valve production and processing, and discloses a production and processing technology of a sealed wear-resistant ball valve, which comprises the following steps: base material pretreatment, wear-resistant bottom layer preparation, functional coating slurry preparation, functional coating coating, sealing surface strengthening treatment, intelligent pressure detection module integration, closed-loop control system assembly, hot isostatic pressing densification treatment, precision calibration and performance testing, surface passivation and packaging. In the application, the nano diamond particles and the chromium-based tungsten carbide composite powder in the functional coating slurry jointly construct a high-hardness wear-resistant framework, resist the abrasive wear and erosion of the sealing surface, the molybdenum disulfide serves as a solid lubricant and forms a transfer film on the friction interface during the working process, reduces the friction coefficient, realizes the self-lubricating effect, the epoxy-modified organic silicon resin serves as a bonding phase, firmly combines the functional components, and endows the coating with good toughness and bonding strength, so that the wear-resistant life and reliability of the ball valve sealing pair are synergistically improved under harsh working conditions.

The application provides a nano-diamond compact and a preparation method and application thereof, and belongs to the technical field of diamond compacts. The nano-diamond compact provided by the application comprises a hard alloy substrate and superhard material hot-pressed on the surface of the hard alloy substrate, and the superhard material is prepared from raw materials with the following mass percentage: diamond micro powder 85-95.5%; cubic boron nitride 1.5-6%; tungsten carbide 1-3%; cobalt powder 1-5%; tantalum powder 0.5-3%; vanadium powder 0.2-3%; and graphene 0.1-1%. The cubic boron nitride, the tungsten carbide and the graphene can toughen and strengthen the nano-diamond compact; the cobalt powder, the tantalum powder and the vanadium powder can catalyze and bond. The nano-diamond compact has good toughness, and can effectively avoid the cracking of the nano-structure diamond compact.

Embodiments include a modular high frequency emission source for the growth of low roughness nanocrystalline diamond films. In one embodiment, a method of manufacturing a nanocrystal diamond (NCD) film includes loading a nanodiamond seed silicon wafer or a bare silicon wafer that has been surface treated and incubated into a microwave plasma enhanced chemical vapor deposition (MWPECVD) chamber, and treating the nanodiamond seed silicon wafer or the bare silicon wafer that has been surface treated and incubated with a plasma of CxHy (y > = x), CO2, and H2 at a power greater than 50 W to form a nanocrystalline diamond layer thereon.

The invention discloses medical liquid silica gel and a preparation method thereof, and relates to the technical field of silica gel materials. The method comprises the following steps: drying vinyl-terminated polydimethylsiloxane with a side chain containing vinyl, and carrying out addition reaction on part of polydimethylsiloxane and dehydrated 1H, 1H, 2H, 2H-perfluorodecyl dimethyl silane to obtain a fluorine-containing modified liquid silica gel matrix; the preparation method comprises the following steps: coating dopamine-coated nano-diamond with a silicon dioxide layer, and then grafting vinyl trimethoxy silane and octyl triethoxy silane, so as to prepare a modified wear-resistant filler; the preparation method comprises the following steps: mixing a fluorine-containing modified liquid silica gel matrix, a modified wear-resistant filler, vinyl MQ silicon resin and a catalyst to prepare a component A; mixing the residual dry base rubber with hydrogen-containing silicone oil and 3-methyl-1-butyne-3-alcohol to prepare a component B; and finally, mixing and curing the component A and the component B. The prepared liquid silica gel has excellent wear resistance and mechanical properties, and is suitable for the field of medical apparatuses and instruments.

The present invention provides an explosive composition containing at least one explosive and at least one heteroatom compound, the heteroatom compound including at least one type of heteroatom selected from the group consisting of B, P, Si, S, Cr, Sn, Al, Ge, Li, Na, K, Cs, Mg, Ca, Sr, Ba, Ti, Zr, V, Nb, Ta, Mo, W, Mn, Ni, Cu, Ag, Cd, Hg, Ga, In, Tl, As, Sb, Bi, Se, Te, Co, Xe, F, Y, and lanthanoids.

A method for producing dihydrogen by photodissociation of water, may include bringing an aqueous solution in contact with oxidized nanodiamonds under solar, natural, or artificial illumination (or light). The oxidized nanodiamonds may have an oxygen / carbon ratio of at least 5% atomic, determined by XPS without previous treatment of the oxidized nanodiamonds. The method may further include preparing the oxidized nanodiamonds by subjecting nanodiamonds to an oxidizing treatment. The oxidizing treatment may include annealing at a temperature of 500° C.±50° C. for a duration in a range of from 1 to 5 hours under an oxygenated atmosphere.

The invention provides a simulation research method for wear resistance of a nano-diamond ceramic coating. The invention aims to solve the problem that the existing wear simulation depends on a user subprogram, needs to empirically zoom coefficients and causes unreliable results due to grid-physical mismatch. According to the method, on the basis of Abaqus software, a high-fidelity contact-wear coupling model is constructed, the size of a local grid is determined in combination with the Hertz contact theory, and multi-cycle automatic control is achieved through a native * STEP CYCLING instruction; meanwhile, differentiated wear parameters are defined for the two contact faces respectively, and a termination criterion based on the accumulated wear depth is introduced. By means of the technical scheme, high-precision, efficient and stable abrasion evolution simulation of the nano-diamond ceramic coating can be achieved without external programming.

The invention discloses aminated nano-diamond modified tough anti-freezing polyvinyl alcohol hydrogel as well as a preparation method and application thereof. Double-network hydrogel is formed through hydrogen-bond interaction between polyvinyl alcohol and xanthan gum, and free free water and intermediate water in the hydrogel are adsorbed through rich amino functional groups on the surface of the aminated nano-diamond, so that the water state of the hydrogel is regulated and controlled. The composite hydrogel disclosed by the invention has high content of bound water, and the toughness and freezing resistance of the hydrogel can be remarkably improved. The invention provides a universal platform for designing the hydrogel with customized low-temperature performance, and opens up a new path for biomedicine and engineering application in cold regions.

The application discloses a metal binder diamond tool and a preparation method thereof, which is composed of the following components in parts by weight: 70-90 parts of a metal binder, 9-20 parts of diamond abrasive and 1-10 parts of nano-enhanced material, wherein the metal binder is prepared from Fe powder and Al powder, and the nano-enhanced material is one of nano-diamond, carbon nano-onion, nano-graphene and nano-carbon tube or a mixture of two or more thereof. The application uses low-cost Fe and Al elements as raw materials, mechanically alloyed in a certain proportion, and adds one kind of nano-enhanced material, so that the nano-enhanced material is uniformly dispersed in the binder as a reinforcing phase through a special rapid sintering process, thereby strengthening the strength and hardness of the binder, reducing the friction coefficient of the binder, and reducing the wear and grinding heat of the binder in the grinding process.

Compositions and articles comprising diamond particles, such as nanodiamond based pharmaceutical compositions, are generally provided. In some embodiments, the articles and methods comprising (nano)diamond particles may be useful for monitoring and / or treating a disease (e.g., in a subject).

The application discloses a kind of Ni3N-ND@G supported bimetallic active site X1Y1 bimetallic atomic site catalyst and its preparation method and application, belong to the field of heterogeneous catalysis technology.The catalyst uses nanodiamond / graphene composite material as carbon carrier, constructs Ni3N active structure on its surface, and introduces X1Y1 bimetallic active site by two different noble metal (Pt, Pd, Rh, Ir, Ru) atom by step pH control strategy.The preparation key is: first, make X1 atom replace part of nickel site on the surface of Ni3N at lower pH, activate its adjacent nickel site;Subsequently, Y1 atom is preferentially replaced at the adjacent nickel site of X1 atom at higher pH, thereby forming adjacent distribution bimetallic active site X1Y1.The catalyst is particularly suitable for 2,6-diamino-3,5-dinitropyridine (DADNP) selective hydrogenation reaction to prepare 2,3,5,6-tetraaminopyridine (TAP), which can achieve high conversion and high selectivity under mild conditions.

This invention discloses a wear-resistant reinforcing layer on the surface of austenitic stainless steel and its preparation method. Using nanodiamond as a carbon source, it is generated in situ on the surface of an austenitic stainless steel substrate through slurry coating and vacuum heat treatment, forming a grain-refining region and creating a continuous gradient reinforcing layer between the nanodiamond and the substrate. This invention utilizes nanodiamond as a highly active carbon source, combined with the synergistic diffusion effect of a specific diffusion aid, to form a continuous grain-refining reinforcing layer on the surface of austenitic stainless steel, achieving a good gradient reinforcing layer with the substrate and significantly improving the overall mechanical properties of the austenitic stainless steel surface.

The invention provides a bonding structure and method for large-size single crystal GaN wafers and single crystal diamonds, and belongs to the technical field of semiconductors, and the method comprises the following steps: cleaning a plurality of single crystal diamonds and single crystal GaN wafers to remove surface pollutants; a plurality of micropore grooves arranged in an array mode are etched in the surface of the single crystal GaN wafer, and each micropore groove is matched with one single crystal diamond in shape and size; hydrogen plasma is used for removing etching residues on the surface of the single crystal GaN wafer, and the surface is activated; preparing a TiN-coated nano-diamond suspension liquid, dropwise adding the suspension liquid to the surface of the single crystal GaN wafer, and then carrying out annealing treatment; an AlN layer is deposited in the micropore groove; and aligning a plurality of single crystal diamonds with the plurality of micropore grooves, and applying pressure to embed and bond one single crystal diamond in each micropore groove. According to the method, efficient heterogeneous integration of the single crystal diamond and the large-size GaN wafer is achieved, the problem of size mismatch of the large-size single crystal GaN wafer and the single crystal diamond is solved, and the method is more suitable for high-power devices.

The invention discloses sedimentation-free and agglomeration-free nano-diamond slurry and a preparation method and application thereof.The sedimentation-free and agglomeration-free nano-diamond slurry is composed of a component A and a component B. The weight percentage of the component A to the component B is 80-95 wt%: 5-20 wt%, the component A is prepared from, by weight, 20-50 wt% of a first organic solvent, 20-50 wt% of a silane coupling agent, 5-20 wt% of a dispersing agent, 5-20 wt% of a permeation promoter and 5-20 wt% of nano-diamond powder, and the component B is prepared from, by weight, 20-50 wt% of a second organic solvent, 5-20 wt% of the content of the silane coupling agent is 2-5 wt%, the content of the dispersing agent is 5-20 wt%, the content of the permeation promoter is 3-10 wt%, the content of the nano diamond powder is 15-70 wt%, and the permeation promoter is selected from at least one of pure Fe powder, pure Co powder, 2% of pure Cr powder and pure CeO2 powder; the component B is prepared from the following raw materials in percentage by weight: 60 to 80 percent of second organic solvent, 10 to 20 percent of resin and 10 to 20 percent of corresponding curing agent. The dispersity and stability of the nano-diamond powder are remarkably improved; the slurry viscosity is optimized, and a simple dip-coating process is realized; a thick hardened infiltrated layer is formed, and the steel hardness is remarkably improved; the process is simple, economical and environment-friendly; and universality and expandability are realized.

The invention relates to the technical field of dehydrogenation monatomic alloy catalysts, in particular to a dehydrogenation monatomic alloy catalyst which comprises a nano-diamond derivative carrier and iridium and copper loaded on the carrier. Wherein the nano-diamond derivative carrier is of a core-shell structure, nano-diamond is used as a core, and graphene is used as a shell layer; wherein the copper is dispersed on the surface of the graphene shell layer in the form of a monatomic layer cluster, the iridium is dispersed on the surface of the copper cluster in the form of atoms, the core-shell structure derivative obtained by roasting the nano-diamond at a high temperature is adopted as the carrier, and the nano-diamond in the core provides excellent mechanical strength and thermal stability; the shell graphene layer has a high specific surface area, abundant defect sites and good conductivity.

The invention relates to the field of pipes, and particularly discloses a flexible composite pipe for land and shallow sea and a preparation method of the flexible composite pipe. The flexible composite pipe comprises a lining layer, a reinforcing layer and a protective layer from inside to outside, and a bonding layer is arranged between the lining layer and the reinforcing layer. The bonding layer is prepared from the following raw materials in parts by weight: 100 parts of ethylene-butyl acrylate copolymer; 10 to 15 parts of PDA coating basalt fiber; 1 to 2 parts of nano diamond; 4-8 parts of a core-shell toughening agent; 6-10 parts of an interface compatilizer; and 2-5 parts of a crosslinking density reinforcing agent. The preparation method comprises the following steps: preparing the lining layer; a bonding layer is coated on the lining layer; a reinforcing layer is wound on the bonding layer in a crossed mode; and the reinforcing layer is coated with a protective layer. According to the flexible composite pipe, the bonding strength between the multiple layers of structures is high, and the leakage risk is low.