42 results about "Silanization" patented technology

The application belongs to the field of super-amphiphobic materials, and discloses a super-amphiphobic coated metal composite material based on a three-layer structure, which comprises, from bottom to top, a silanized metal substrate, an intermediate layer and a super-amphiphobic coating layer; the intermediate layer is formed by immersing and drying an emulsion of microcapsules dissolved in an organic polymer matrix solution, and the microcapsules are formed by wrapping photosensitizers and first SiO2 super-amphiphobic particles with a polymer matrix; the super-amphiphobic coating layer contains second SiO2 super-amphiphobic particles; the first SiO2 super-amphiphobic particles and the second SiO2 super-amphiphobic particles are nano-SiO2 modified by silane coupling agents and then modified by perfluoroalkyl silane. By introducing nano-SiO2 with low surface energy functional groups into the intermediate layer and the super-amphiphobic coating layer, and by designing the intermediate layer to be formed by drying microcapsules containing SiO2 super-amphiphobic particles dissolved in an organic polymer matrix solution, the surface of the composite material and the composite material after surface damage can still maintain the effects of being hydrophobic and oleophobic.

The present application belongs to the technical field of self-repairing coating, and relates to a preparation method of a green photo-thermal super-hydrophobic self-repairing coating. The preparation method specifically comprises the following steps: step 1, polydopamine coating carbon black; step 2, carbon black silane modification; step 3, hybrid wall microcapsule preparation; step 4, silanized carbon black branch connection microcapsule; and step 5, mixed spraying. The present application synthesizes non-fluorinated low-surface-energy particles, adopts non-fluorinated super-hydrophobic carbon black branch connection modification microcapsule to prepare a photo-thermal super-hydrophobic self-repairing coating, the use of the non-fluorinated coating reduces cost and protects the environment; and the nano-composite coating is composed of nano-particle fillers and an organic polymer resin coating. In the coating, the branch connection carbon black endows the coating with excellent photo-thermal conversion capability to realize the deicing function, at the same time, the rupture of the microcapsule realizes the release of the dehydrated castor oil core material, and realizes the self-repairing of the damaged area of the coating, and the hydrophobic modification layer of the carbon black and the hybrid structure of the microcapsule together guarantee the super-hydrophobicity and durability of the coating.

The siloxane-based corrosion resistant adhesive is prepared from a reaction mixture such that after curing in the form of a layer, the formed siloxane-based adhesive has a stable modulus and a shear storage modulus at a frequency of 1 Hz of no more than 0.2 MPa as measured by DMA (Dynamic Mechanical Analysis). In addition, the cured siloxane-based adhesive layer is optically transparent, and after lamination to a silver nanowire film, the silver nanowire film has a change in resistance of less than 10% after aging for 500 hours at a relative humidity of 65 DEG C / 90%. The reaction mixture forming the siloxane-based adhesive includes at least one vinyl-functionalized siloxane, at least one hydrogen-functionalized siloxane, at least one hydrosilylation catalyst, at least one siloxane tackifying resin, and at least one anticorrosive agent.

This invention discloses a high-conductivity emulsion-type intelligent fracturing fluid for oil and gas field enhancement and its preparation method. This fracturing fluid aims to solve the technical problem of the contradiction between the proppant-carrying capacity and the post-colloidal conductivity of traditional fracturing fluids in deep wells under high temperature and high salinity environments. Its core lies in the introduction of a temperature- and salt-responsive zirconium-silicon hybrid nano-crosslinking agent and biomimetic surface-modified layered silicate nanosheets. In preparation, a water-in-oil base emulsion is first formed, followed by the sequential addition of the two modified compounds. The nano-crosslinking agent is prepared through silanization and polymer grafting processes, enabling intelligent activation and viscosity enhancement under formation conditions. The nanosheets are prepared through montmorillonite exfoliation and biomimetic dopamine coating modification, combining drag reduction and proppant surface modification functions. This fracturing fluid system achieves intelligent response with low friction during pumping, high proppant-carrying capacity in the formation, and the formation of high-conductivity channels after colloidal breakdown, making it particularly suitable for fracturing and stimulation of deep and unconventional reservoirs.

This invention discloses a high-performance, yellowing-resistant TPU interlayer for laminated glass and its preparation method, belonging to the field of adhesives and polymer materials technology. This invention achieves permanent covalent anchoring with the glass substrate through silane chemical grafting, reversibly controls the interface molding quality through dynamic borate ester bonds, and achieves bulk free radical capture and antioxidant effects through the "inorganic-organic" synergistic effect of CeO2@GA. These methods synergistically solve the core problems of interfacial adhesion failure and bulk aging yellowing of TPU interlayers under humid and hot environments. The resulting TPU interlayer has a tensile strength of up to 24.1 MPa, an elongation at break of 480-550%, a phenolic yellowing resistance rating of 4.5-5.0, and a yellowing resistance Δb ≤ 0.45, exhibiting excellent comprehensive performance and broad application prospects in the field of laminated glass.

The present application belongs to the technical field of rectification separation, and provides a rectification separation and purification method for preparing high-purity o-dichlorobenzene. The present application adopts the design of loading surface-modified structured packing in the rectification section of the rectification tower. The structured packing is composed of an alumina ceramic matrix and a cross-linked copolymer layer. The cross-linked copolymer layer contains structural units formed by N-vinyl-2-pyrrolidone, 2-hydroxyethyl methacrylate and ethylene glycol dimethacrylate, and is prepared through a silanization and graft cross-linking polymerization process. The rectification tower is operated under the conditions of a tower top absolute pressure of 0.5-20 kPa and a reflux ratio of 2-6. The present application realizes the efficient separation of o-dichlorobenzene products with a purity of not less than 99.9 wt% from dichlorobenzene isomer mixtures, solves the problem that the structured packing in a low-pressure rectification system cannot simultaneously achieve low pressure drop, large flux and high separation efficiency, and the stability of the surface modification layer in a high-temperature organic vapor environment is insufficient, and has wide industrial application value.

The application relates to the technical field of oil field chemical additives, and discloses a quaternary ammonium salt type clay stabilizing anti-swelling agent and a preparation method thereof, wherein the preparation method is as follows: a urea bond branched quaternary ammonium salt is added into deionized water, stirred for 8-12 minutes, then silanization modified graphene oxide is added, and stirring is continued for 15-20 minutes until the silanization modified graphene oxide is uniformly dispersed, and then filtration is carried out to obtain the quaternary ammonium salt type clay stabilizing anti-swelling agent. The urea bond branched quaternary ammonium salt containing a branched topological structure, an urea bond hydrogen bond anchoring site and a sulfonic acid group salt-resistant group is prepared, and is compounded with the silanization modified graphene oxide to obtain the quaternary ammonium salt type clay stabilizing anti-swelling agent. The quaternary ammonium salt type clay stabilizing anti-swelling agent prepared by the application has good high-temperature resistance, high-salt resistance and water washing resistance.

This invention discloses an adsorption rotor of fiber composite molecular sieve and its preparation method, relating to the field of adsorption materials. The adsorption rotor of this invention is prepared by impregnating a cylindrical channel-containing preform rolled from corrugated glass fiber paper modified by coupling agent with a composite slurry composed of dispersant, modified molecular sieve, and silica sol, followed by calcination. The modified molecular sieve is prepared by silanizing and grafting ZSM-5 molecular sieve modified with citric acid using a silanizing modifier. The silanizing modifier is prepared by nucleophilic substitution reaction of 1-heptylamine with (2,2,3,3,4,4,5,5,5-nonafluoropentyl)ethylene oxide to obtain a fluorinated intermediate, followed by amino protection of the fluorinated intermediate, and then nucleophilic substitution reaction of the intermediate with 3-glycidyl etheroxypropyltriethoxysilane to obtain a silanizing modifier precursor. Finally, the silanizing modifier precursor is deprotected by amino treatment.

The present application belongs to the technical field of high polymer protective material, and particularly relates to a preparation method and application of a photo-thermal super-hydrophobic coating with self-repairing and anti-icing and de-icing performances. The present application first loads 1,10-phenanthroline into the lumen of halloysite nanotubes through vacuum-assisted adsorption, then forms a polydopamine coating layer on the surface of the halloysite nanotubes by in-situ self-polymerization of dopamine under alkaline conditions, and then modifies the composite particles by silanization and fluorination to endow the particles with low surface energy. Finally, the obtained composite filler is uniformly dispersed in epoxy resin, coated and cured to form a coating. The coating prepared by the method of the present application exhibits excellent super-hydrophobicity and self-repairing performance, and can accurately release corrosion inhibitor to restore its protective performance when damaged. In addition, the coating exhibits excellent icing delay and active de-icing performance. The photo-thermal self-repairing super-hydrophobic coating provides a promising solution to the corrosion and icing challenges in low-temperature marine environments.

Methods for selective deposition of silicon oxide films on metal or metallic surfaces relative to dielectric surfaces are provided. A dielectric surface of a substrate may be selectively passivated relative to a metal or metallic surface, such as by exposing the substrate to a silylating agent. Silicon oxide is then selectively deposited on the metal or metallic surface relative to the passivated oxide surface by contacting the metal surface with a metal catalyst and a silicon precursor comprising a silanol.

This invention discloses a calcium fluoride nanoparticle composite material and its application, comprising a resin matrix, calcium fluoride nanoparticles, and barium silane glass particles. The calcium fluoride nanoparticles constitute 15-40% of the composite material by mass, and the barium silane glass particles constitute 15-30% by mass. The calcium fluoride nanoparticles are prepared through the following steps: Step 1, calcium chloride and ammonium fluoride are dissolved in a methanol aqueous solution at a predetermined ratio and stirred until the solution becomes an opaque white suspension. The suspension is then centrifuged and washed to remove residual chloride and ammonium ions, yielding calcium fluoride nanoparticles. Step 2, the calcium fluoride nanoparticles are added to distilled water to form a suspension. The suspension is pumped into a spray drying system for atomization, and the spray-dried calcium fluoride nanoparticles are collected. The calcium fluoride nanoparticles obtained by spray drying in this invention exhibit better dispersibility and smaller particle size, improving the compressive strength and microhardness of the composite material.

This invention discloses a polyimide-epoxy resin composite material for high-frequency insulation, its preparation method, and its application, belonging to the technical field of high-frequency power equipment insulation materials. The preparation method provided by this invention is as follows: a polyimide film is subjected to surface carboxylation treatment to obtain a surface carboxylated film; the surface carboxylated film is immersed in a silane coupling agent hydrolysate for surface modification to obtain a surface silanized film; the silane coupling agent hydrolysate includes an amino-containing silane coupling agent, a solvent, acetic acid, and a divalent tin salt; an epoxy resin composition is cast onto the surface of the surface silanized film and cured to obtain the final product. This invention utilizes a synergistic catalytic system composed of acetic acid and divalent tin salt to construct a chemically bridged interface on the polyimide surface through silane coupling agent treatment, significantly improving the insulation performance, interfacial bonding strength, and electrothermal aging resistance of the composite material at high frequencies.

The application relates to the technical field of adhesives, and specifically discloses a non-UV wafer BG thinning adhesive tape and a preparation method thereof. The non-UV wafer BG thinning adhesive tape comprises a substrate layer, a buffer adhesive layer and a release film layer; the buffer adhesive layer is prepared from the following raw materials in parts by mass: 60-70 parts of soft monomers, 15-25 parts of high-Tg hard monomers, 1.5-3 parts of bifunctional acrylate monomers, 4-7.5 parts of functional monomers, 3-4 parts of silanized nano calcium carbonate, 2.5-4.0 parts of isocyanate cross-linking agents, 0.6-0.8 parts of initiators, 0.2-0.4 parts of antioxidants and 80-120 parts of solvents; the functional monomers comprise epoxy acrylate and acrylic monomers; and the high-Tg hard monomers comprise isobornyl methacrylate and hard monomer A. The non-UV wafer BG thinning adhesive tape prepared by the application has the advantages of high thinning precision, clean peeling without residual adhesive and stable substrate supporting performance.

This invention discloses an anti-aging PP composite material and its preparation method, belonging to the field of polymer composite material technology. The anti-aging PP composite material is prepared by adding a composite anti-aging agent BP-4@LDH-DAO to PP. The composite anti-aging agent is based on hydrotalcite (LDH), modified by intercalation with the ultraviolet absorber BP-4, and then surface-grafted with the silanized antioxidant KH-560-DAO. This invention, by adding a small amount of composite anti-aging agent to polypropylene, can effectively enhance the PP material's resistance to ultraviolet radiation, heat and oxygen aging, and oxygen barrier properties, preparing a high-performance PP composite material. Its comprehensive anti-aging performance is superior to antioxidant 1010, and its synergistic effect with antioxidant 168 is even better, showing potential application value.

The application belongs to the field of environmental catalytic materials and wastewater treatment technology, and particularly relates to a zinc-doped graphite carbon nitride material for loading laccase, immobilized laccase and a preparation method and application thereof. The zinc-doped graphite carbon nitride material for loading laccase is prepared by mixing zinc salt, urea and deionized water in a ratio of (0.04g-0.08g):8g:20mL, drying, and calcining under an inert atmosphere to obtain a solid material, and then silanizing the solid material to obtain the zinc-doped graphite carbon nitride material. The immobilized laccase is used to degrade pollutants with a concentration of 10mg / L-30mg / L and a pH of 2-11.

The application discloses a kind of mussel biomimetic enhanced nanocellulose composite antifouling coating and preparation method thereof, belong to marine antifouling material technical field.Preparation method includes: S1, preparation of zwitterionic cellulose nanofiber;S2, preparation of silanization modified polydopamine loaded nanosilver;S3, preparation of composite coating precursor solution;S4, coating and gradient solidification.The coating is zwitterionic cellulose nanofiber as matrix, compound hydroxyl-terminated polydimethylsiloxane and silanization modified polydopamine loaded nanosilver, through mussel biomimetic adhesion strengthens interfacial adhesion, relies on hydrophobic-hydrophilic interpenetrating network to improve anti-swelling performance, integrates hydration layer physical barrier, low surface energy fouling detachment and nanosilver broad-spectrum bactericidal function, realize synergistic efficient antifouling.The coating of the application has strong adhesion, excellent anti-swelling, durable and green antifouling effect, and can be widely applied to antifouling treatment of ships, offshore platforms, fishing nets and the like, and has important application value and market prospect.

This invention relates to the field of inorganic separation membrane technology and discloses a method for preparing a high-strength multilayer ceramic composite separation membrane. The steps include: first, preparing a porous ceramic support with interconnected channels by mixing, extruding, drying, and first-stage sintering alumina powder, pore-forming agent, and binder in a specific ratio; second, forming a transition layer on the support using a fine-particle-size ceramic slurry via a dip-coating method; third, preparing a separation layer precursor sol using a sol-gel method and depositing it onto the transition layer using a spin-coating method; and finally, subjecting the composite membrane preform to a programmed temperature-controlled co-sintering densification treatment and selectively performing surface modifications such as chemical vapor deposition, silanization, or ion exchange. This invention enhances the overall mechanical strength and interlayer bonding of the multilayer ceramic composite separation membrane, improves the chemical stability, antifouling ability, and adaptability to specific separation systems of the composite membrane surface.

This invention discloses a high-temperature resistant, highly flexible, thick acrylic pressure-sensitive adhesive based on epoxy-functionalized silica microspheres anchored therein, and its preparation method. The pressure-sensitive adhesive comprises a carboxyl-containing acrylate copolymer, epoxy-functionalized silica microspheres, and an external crosslinking agent. The preparation method is as follows: first, epoxy groups are grafted onto the surface of silica microspheres via a silanization reaction; then, an acrylate copolymer mainly composed of soft monomers and containing carboxyl groups is synthesized; next, the epoxy groups on the surface of the silica microspheres undergo a ring-opening addition reaction with the carboxyl groups on the polymer chain to achieve covalent anchoring of the silica microspheres; finally, an external crosslinking agent is added, and the mixture is coated and cured to form an adhesive layer. The core of this invention lies in constructing a "soft phase continuous, hard point anchored" micro-composite structure through covalent bonds, which significantly suppresses cold flow and cohesive instability of the thick adhesive layer at high temperatures while maintaining high flexibility and good initial tack. The resulting pressure-sensitive tape retains excellent high-temperature resistance and high flexibility even after treatment at 130°C for 30 minutes.

A device (1) for ionizing an air stream comprises a container (2) made of electrically insulating material, an inner electrode (3) arranged inside the container (2), an outer electrode (10) arranged on the outside of the container (2), and control electronics (12) connected to the inner electrode (3) and the outer electrode (10) for supplying a voltage. The inner and / or outer surface of the container (2) is acid-treated. An electrically conductive material (7) is placed inside the container (2) with the inner electrode (3) inserted into the electrically conductive material (7), and the inner electrode (3) is surrounded by the electrically conductive material (7). The inner and / or outer surface of the container (2) is made hydrophobic by silanization.

The application discloses a kind of optical fiber coating materials with electromagnetic shielding performance and preparation method thereof, it is related to optical fiber coating protection and electromagnetic compatibility technical field.The application includes providing polyvinylidene fluoride, silver-coated copper flaky powder, multi-walled carbon nanotube, nanometer silicon dioxide, gamma-aminopropyl triethoxysilane, hindered phenol antioxidant, polyethylene wax and thermoplastic polyurethane, the nanometer silicon dioxide is silanized surface treatment and solidification dry, and modified nanometer silicon dioxide is obtained.The application is silanized and modified by nanometer silicon dioxide, and silver-coated copper flaky powder and multi-walled carbon nanotube are premixed and sheared to form conductive premix, melt blend extrusion in polyvinylidene fluoride / thermoplastic polyurethane continuous matrix phase and further coaxial extrusion coating on the outside of optical fiber, so as to obtain coating layer with electromagnetic shielding capacity under the premise of not changing the structure of optical fiber, realize the anti-interference and shielding protection effect of optical fiber in complex electromagnetic environment.

The application discloses a kind of purification process of potassium nitrate in the technical field of inorganic functional materials, the process includes: after dissolving potassium nitrate crude product, preliminary impurity removal is carried out by activated carbon, then using multistage pore manganese-doped silicon-aluminum composite oxide zero-valent iron-carbon composite adsorbent is carried out deep purification, the adsorbent can selectively adsorb calcium and magnesium ions and degrade organic impurities, after purification, filtrate is obtained by cooling crystallization high-purity potassium nitrate product, and the adsorbent can be regenerated and recycled.The preparation of the adsorbent includes: forming hydrotalcite layer on the surface of iron-carbon microspheres by coprecipitation method, constructing multistage pore composite oxide shell by manganese loading, silicon source coating and high-temperature calcination, then hydrophobic modification is carried out by gas-phase silanization, and finally the final product is obtained by acid activation and reduction treatment.The process has high purification efficiency, the adsorbent is functionally integrated and recyclable, and is suitable for industrial production of high-purity potassium nitrate.

This invention relates to the field of epoxy resin coating technology, specifically to a high-shield epoxy glass flake anti-corrosion coating and its preparation process. This invention overcomes the problem in existing epoxy glass flake anti-corrosion coatings that cannot simultaneously achieve both anti-corrosion performance and adhesion performance. The anti-corrosion coating of this invention is obtained by mixing an epoxy active component and a modified curing agent. The epoxy active component is a mixed epoxy resin of bisphenol A and bisphenol F, with the introduction of a polyurethane-modified epoxy prepolymer and a reactive UV absorber for toughening and chain extension, combined with polydopamine-modified glass flakes and silanized graphene oxide. The modified curing agent is a cashew phenolic amine modified with a silane coupling agent. Through a segmented cooling and stirring process, the glass flakes are arranged in an orderly layered manner within the coating, resulting in a coating with excellent shielding and anti-corrosion properties, suitable for long-term protection of steel structures in extreme corrosive environments.

The application discloses a flexible triboelectric sensor based on modified conductive fabric and a preparation method thereof, and comprises the following steps: a flexible packaging layer is arranged at the bottom of the sensor; a modified conductive fabric electrode layer is arranged on the upper surface of the flexible packaging layer, and the modified conductive fabric electrode layer comprises a fabric substrate with amino functional groups and a conductive network anchored on the fabric substrate through an amide bond, wherein the conductive network is composed of carboxylated multi-walled carbon nanotubes and carbon black; and a high-dielectric composite sensitive layer is arranged on the upper surface of the modified conductive fabric electrode layer and is composed of an elastomer matrix doped with high-dielectric constant ceramic particles and graphene which are subjected to surface silanization treatment. The flexible triboelectric sensor and the preparation method thereof can construct a stable conductive network through chemical bonding, improve dielectric properties through surface modification of fillers and micro-nano structure design, and the obtained sensor has high stability, high output power and wide material adaptability.

The application discloses a preparation method of a double-layer calcium carbonate drug-loaded multifunctional coating on a medical metal material surface, and belongs to the technical field of metal material surface modification. The method comprises the following steps: firstly, a bottom-layer calcium carbonate coating is prepared on the metal material surface by using a hydrothermal treatment; secondly, hollow nano calcium carbonate particles are prepared in a vacuum drying box by using a gas diffusion method, and an antibacterial drug is loaded in the prepared hollow nano calcium carbonate particles; then, the drug-loaded nano calcium carbonate is loaded on the bottom-layer calcium carbonate coating by forming a covalent bond through dehydration condensation of surface silicon hydroxyl groups (-Si-OH-) and hydroxyl groups on the surface of the bottom-layer calcium carbonate coating by silanization, so that the drug-loaded nano particles are loaded on the bottom-layer calcium carbonate coating, and finally, the double-layer calcium carbonate drug-loaded multifunctional coating is obtained. The prepared coating can provide excellent corrosion protection capability for a medical metal material substrate, and can improve the osteogenic activity and antibacterial performance of the medical metal material substrate; the coating preparation method is green and environment-friendly, has good efficacy, and can be widely applied to the surface modification of biomedical metal materials.

Disclosed are an extraction rod and a preparation method thereof, and a method for detecting 25-hydroxyvitamin D, belonging to the technical field of analysis and detection. The preparation method includes: subjecting a glass rod to etching, silanization, a heat treatment, and activation in sequence to obtain an activated glass rod; placing the activated glass rod in a 25-hydroxyvitamin D antibody solution, and conducting coupling to obtain an antibody-coupled glass rod; and subjecting the antibody-coupled glass rod to deactivation and covalent bond fixation in sequence to obtain the extraction rod.

The application discloses a method for preparing chromium acetate from chromium hydroxide, which comprises the following steps: mixing chromium hydroxide wet filter cake with sulfonic acid group-chromium oxide composite mesoporous silica balls according to a proportion, adding glacial acetic acid, and then carrying out reaction, heating, separation, concentration crystallization and drying to obtain high-purity chromium acetate. The sulfonic acid group-chromium oxide composite mesoporous silica ball modified material is prepared by the following steps: first, synthesizing a mesoporous silica ball base by using a template agent, then loading chromium oxide and grafting a mercapto group by silanization, and finally oxidizing to obtain a sulfonic acid group functionalized material. The material can selectively adsorb impurity ions in situ in the reaction, so that the traditional complicated purification steps are simplified. The application has the advantages of simple operation, high product purity, and good industrial application prospect.

The application provides a surface modification method of a polyolefin base material, a modified polyolefin material and application of the modified polyolefin material in the field of valves, which comprises the following steps: firstly, surface plasma treatment and silanization treatment are performed on the polyolefin base material to introduce active groups on the surface of the polyolefin base material, and then the polyolefin base material is modified by using diisocyanate according to the structural characteristics of polyurethane; and then, the chemical reaction between the modified polyurethane and the modified polyolefin base material is utilized to realize the modification of the polyurethane on the surface of the polyolefin base material. In the technical scheme, the formation of the chemical bond between the polyolefin and the polyurethane effectively enhances the bonding strength between the polyolefin and the polyurethane, ensures the overall consistency of the prepared modified polyolefin material, effectively improves the service life of the modified polyolefin material in clinical application, and solves the defects that the polyurethane valve material prepared in the prior art is prone to delamination and cracking during use.

This application relates to the field of in vitro detection technology, specifically to a high-density BSA-loaded glass slide and its preparation method, as well as a method for detecting pepsin content. The high-density BSA-loaded glass slide is obtained by coupling bovine serum albumin with a glass slide whose surface active sites have been amplified at high density. The glass slide with amplified surface active sites is formed by coupling a hydroxylated transparent glass slide with a dendritic polymer after epoxy-silanization modification. By linking the dendritic polymer to the epoxy-silanized transparent glass slide, an exponential amplification of the limited active sites on the slide surface is achieved. Then, the high-density and stable coupling of the bis(succinimide) octanoate to the ends of the dendritic polymer significantly increases the substrate loading and immobilization stability on the slide surface, enhancing its reaction signal with pepsin, thereby effectively improving the sensitivity of the detection system and lowering the detection limit.

This invention relates to the field of alloy materials and surface engineering technology, specifically to an aluminum alloy sheet with high weather resistance and self-cleaning function and its preparation method. The invention discloses an aluminum alloy sheet with high weather resistance and self-cleaning function and its preparation method. The sheet comprises, from the inside out: an aluminum alloy matrix containing nanoscale Al2CuMg and Mg2Si phases; a micro-nano composite rough structure formed in situ on the matrix surface by selective etching to precipitate phases; an inorganic ceramic protective layer deposited conformally by atomic layer deposition; and an organic hydrophobic layer formed by vapor-phase silanization grafting. The preparation method mainly includes: solution treatment and pre-aging of an aluminum alloy with specific composition; selective etching using an acid solution containing corrosion inhibitors to construct the surface micro-nano structure; and sequential application of a gradient functional coating through atomic layer deposition and vapor-phase silanization to obtain the final aluminum alloy sheet product.