881 results about "Tetraethyl orthosilicate" patented technology

The invention discloses a coating as well as a preparation method and application thereof. The coating comprises the following raw materials: potassium silicate; ethyl orthosilicate; a nanometer titanium dioxide sol; rare earth is doped with nano titanium dioxide; compounding zinc oxide nanoparticles; nano silicon dioxide sol; a fluorosilane coupling agent; a fluorocarbon surfactant; a conductive carbon nanotube; nano aluminum oxide sol; an organic silicon modified acrylate emulsion; a boron nitride nanosheet; hollow glass beads; a shape memory polymer; the invention discloses a self-repairing nanofiber. After a coating is formed by using the coating, the coating has the characteristics of high light transmittance, good self-cleaning effect, high hardness, good adhesive force and excellent weather resistance, and can be applied to a photovoltaic module to replace an existing photovoltaic module coating product.

The invention belongs to the technical field of environmental protection, and provides a preparation method of an imine-modified functionalized mesoporous magnetic silicon dioxide nano material. The method comprises the following steps: synthesizing Fe3O4 magnetic nanoparticles in a Fe < 2 + > / Fe < 3 + > alkaline hydrolysis system through a coprecipitation method; then coating the magnetic nanoparticles with an amorphous silicon dioxide layer by taking TEOS (tetraethoxysilane) as a silicon source by adopting a sol-gel method, so as to prepare magnetic silicon coated nanoparticles; the prepared nano-particles are subjected to secondary silicon coating guided by a cetyl trimethyl ammonium bromide (CTAB) mesoporous template agent, and mesoporous magnetic silicon nano-particles are formed after calcination; and finally, carrying out surface amination modification on the mesoporous magnetic silicon nano-particles by utilizing an amino silane coupling agent, and then carrying out condensation reaction on the mesoporous magnetic silicon nano-particles and various aldehyde derivatives to construct imine bonds, so as to obtain the imine-modified functionalized mesoporous magnetic silicon dioxide nano-material. The imine-modified functionalized mesoporous magnetic silicon dioxide nano-material formed by the invention has the characteristics of efficient adsorption, rapid magnetic recovery and excellent environmental stability, and can effectively remove polystyrene micro-plastics and organic pollutants in a water body.

The invention discloses a dry-process high-temperature-resistant lithium battery diaphragm and a preparation method thereof, and relates to the technical field of lithium battery diaphragms. The specific preparation method comprises the following steps: activating and cross-linking polypropylene, polyimide, a PP-b-PI block copolymer and a cross-linking agent BIBP under the protection of nitrogen to prepare a polypropylene-polyimide matrix; after melting, adding a pre-sintered ZrO2-coated Al2O3 core-shell filler, hydroxylated boron nitride and zinc borate, and carrying out double-stage screw extrusion, ultrasonic orientation, nitrogen annealing and cold roller quenching to obtain a mixed melt; carrying out warm stretching and hot air circulation heat treatment to prepare a hard elastic crystal base film; carrying out stretching, thermal relaxation and thermal shaping to obtain a microporous base membrane; after slitting, plasma activation is carried out, epoxy silane and tetraethyl orthosilicate / polybenzimidazole aerogel precursors are sprayed, and a nano closed-pore coating is formed through pre-curing and heat shrinkage curing; and finally eliminating static electricity and rolling to obtain a finished product. The lithium battery diaphragm prepared by the invention is excellent in high temperature resistance and low in thermal shrinkage rate.

The invention relates to the technical field of polymers, particularly provides a preparation method of acrylic resin and the acrylic resin, and aims to solve the problem of poor water resistance of the existing acrylic resin. Therefore, the preparation method of the acrylic resin comprises the following steps: S2, mixing and heating a refined styrene compound and a mixed solvent, and adding a catalyst for reaction; s3, stopping heating the reaction system after the reaction in the step S2, recovering to room temperature, and adding an acrylate compound for reaction; s4, adding a modifier into a reaction system after the reaction in the step S3, and reacting; and S5, adding tetraethoxysilane, ammonia water and n-butyl alcohol into the reaction system after the reaction in the step S4 for reaction, then adding an alcohol solvent to precipitate a polymer, and drying to obtain the acrylic resin. The acrylic resin prepared by the preparation method provided by the invention has excellent water resistance and impact hardness.

The invention discloses flame-retardant recyclable compressible biodegradable cellulose aerogel and a preparation method and application thereof.The preparation method comprises the following steps that 1, phosphorus / nitrogen-containing bridged organosiloxane and tetraethyl orthosilicate are added into bacterial cellulose dispersion liquid and stirred to be uniform, and a milk white dispersion solution is prepared; (2) heating, curing, pre-freezing and freeze-drying the milky white dispersion solution to obtain the flame-retardant recyclable compressible biodegradable cellulose aerogel, and the phosphorus / nitrogen-containing bridged organosiloxane is prepared by carrying out a reaction on phosphonitrilic chloride trimer and 3-aminopropyltriethoxysilane. The prepared cellulose aerogel is excellent in flame retardance, heat insulation and cyclic compression performance, and has a feasible application prospect in the aspect of radiation refrigeration.

The invention discloses a slow-release coating for pesticide-fertilizer particles and a preparation method of the slow-release coating, and belongs to the technical field of biological agriculture. The coating is composed of 30-60 parts of potassium fulvate, 20-40 parts of a high polymer material, 5-15 parts of a lubricant, 5-10 parts of a binder and 1-10 parts of a performance additive, the performance additive is prepared into nanoparticles through tetraethoxysilane and 11-chlorodecanoic acid, and the nanoparticles are modified through a silane coupling agent and then crosslinked with chitosan to form a composite structure. According to the preparation method, a double-screw gradient mixing process (800-1200 rpm, 40 + / -5 DEG C) is adopted, and fluidized bed atomization spraying and three-stage drying are combined. According to the technical breakthrough, the utilization rate of zinc ions is increased to 68.2% from 41.5%, the coating crushing strength reaches 48.3 N, the 28d zinc release amount is 12.3 mg / L, and the 30d degradation rate is 14.2%. Through the synergistic effect of pH buffering of potassium fulvate and modified nanoparticles, the problems of zinc immobilization and phosphorus-zinc antagonism of high-pH soil are effectively solved, the fertilizer is suitable for corn, rice and other crops, and field tests show that the yield is increased by 18.7%.

The invention discloses a nitrogen-containing carbon hollow sphere supported cobalt-based catalyst as well as a preparation method and application thereof, and belongs to the technical field of catalyst preparation. According to the preparation method, ammonia water, tetraethyl orthosilicate, polyoxyethylene polyoxypropylene ether triblock copolymer, resorcinol and a formaldehyde solution are fully reacted in a mixed solvent of deionized water and ethanol by virtue of a template method, and the nitrogen-containing carbon hollow spheres are obtained after calcination and etching; then carrying out surface modification on the nitrogen-containing carbon hollow spheres, and uniformly loading cobalt metal by virtue of the structure guiding effect of hexamethyleneimine and sodium citrate dehydrate; the prepared nitrogen-containing carbon hollow sphere supported cobalt-based catalyst has abundant highly-exposed Co-N-C active sites, has wide substrate universality, has good catalytic activity and selectivity for amination reactions with various long-chain fatty aldehydes, fatty ketones, cyclic fatty ketones, aromatic aldehydes and ketones as raw materials, and can realize efficient catalytic amination reactions of carbonyl compounds.

The invention relates to the technical field of UV coatings, in particular to a waterproof wear-resistant UV coating for a floor and a preparation method of the waterproof wear-resistant UV coating. The waterproof and wear-resistant UV coating for the floor is prepared from the following raw materials in parts by mass: 30 to 60 parts of polyurethane acrylate, 20 to 40 parts of fluorinated epoxy acrylate oligomer, 20 to 40 parts of pentaerythritol tetraacrylate, 1 to 5 parts of tetraethoxysilane, 15 to 25 parts of hollow glass beads, 1 to 3 parts of ammonia water, 1 to 2 parts of trifluoropropane trimethoxysilane and 1 to 2 parts of amino-terminated polyamidoamine. The coating is prepared from 1-3 parts of graphene oxide, 1-2 parts of a photoinitiator, 1-2 parts of polytetrafluoroethylene wax, 0.5-1.5 parts of a dispersing agent, 1-2 parts of a flatting agent and 1-2 parts of a defoaming agent. The waterproof coating is excellent in waterproof effect, high in adhesive strength and excellent in dimensional stability; when the coating is subjected to mechanical actions such as friction and impact, the surface of a coated object is comprehensively protected, the wear rate is remarkably reduced, and the wear resistance is improved.

The invention relates to a continuous production method of high-purity tetraethoxysilane, and belongs to the technical field of tetraethoxysilane preparation. The method comprises a raw material pretreatment stage and a purification and rectification stage: in the pretreatment stage, silicon tetrachloride and ethanol are subjected to an esterification reaction in a molar ratio of 1: (3-4) under the protection of nitrogen, the pH is adjusted to be neutral through triethylamine, and triethylamine hydrochloride is removed through reduced pressure distillation; then, a cerium oxide-molecular sieve composite adsorbent with the specific surface area larger than or equal to 800 m / g and the pore diameter of 2-5 nm is adopted for dehydration under the pressure of 0.8-1.2 MPa till the water content is smaller than or equal to 5 ppm, and volatile impurities are removed through high-purity nitrogen purging; in the purification stage, metal ions and Cl are synergistically removed through a titanate modified resin layer and a nano TiOtube layer, and then step-by-step separation is performed through a four-stage differential pressure rectifying tower. Through collaborative optimization of structural design of the composite adsorbent, construction of an organic-inorganic hybrid interface of the resin layer and pressure gradient rectification, 72-hour continuous production is achieved, the single-pass yield of the product is 92%, and the total amount of metal impurities is smaller than or equal to 5 ppb.

The invention relates to the field of fiber materials, and provides a low-dielectric constant glass fiber and a preparation method thereof, and the low-dielectric constant glass fiber comprises basalt glass fiber and a silicon oxyfluoride layer coating the surface of the basalt glass fiber. The basalt glass fiber is prepared by adopting a melting wire drawing method, the average diameter is 5.0-15.0 microns, and the volume ratio of a crystalline state to an amorphous state is controlled to be (5.0-15.0): (85.0-95.0). The thickness of the silicon oxyfluoride layer is 140-400 nm, and the silicon oxyfluoride layer is obtained through a sol-gel method and is formed by conducting dipping, ultrasonic treatment and purging on tetraethoxysilane and ammonium fluoride sol and then conducting heat treatment in an inert atmosphere. The preparation method comprises the steps of basalt raw material crushing, acid pickling, melting, wire drawing and gradient cooling, and the uniformity and stability of the fibers are ensured. The preparation conditions, impregnation parameters, purging pressure and heat treatment temperature of the modified sol are all optimized, so that uniform coating and stability enhancement are realized. The glass fiber provided by the invention has low dielectric constant and excellent heat resistance and hydrophobicity, and is suitable for the fields of high-frequency electronic substrates, aerospace and 5G communication.

The invention discloses preparation of isotropic flame-retardant bacterial cellulose aerogel and fire early warning application of the isotropic flame-retardant bacterial cellulose aerogel, and belongs to the technical field of aerogel materials. The preparation method of the aerogel comprises the following steps: (1) adding phosphorus / nitrogen-containing bridged organosiloxane and tetraethyl orthosilicate into bacterial cellulose dispersion liquid in proportion, and then stirring to obtain milk white uniform and stable turbid liquid; and (2) heating and curing the milky white turbid liquid, then precooling, and finally freeze-drying to obtain the isotropic flame-retardant bacterial cellulose aerogel. The aerogel disclosed by the invention is a cellulose-based aerogel material with flame-retardant and heat-insulating properties, has a remarkable isotropic flame-retardant characteristic, can effectively resist flame spread in all directions, is high in carbonization efficiency, can realize early detection and early warning of a fire disaster, and has a great application prospect in the field of fire disaster early warning.

The invention discloses a self-lubricating aluminum coating and a preparation method thereof.The preparation method comprises the steps that molybdenum disulfide is pretreated through a silane coupling agent, tetraethoxysilane mixed liquor is added, the pH is adjusted to be 9-10, a water bath reaction is conducted, and molybdenum disulfide-silicon dioxide microcapsules are obtained after high-temperature strengthening treatment; respectively adding a zinc nitrate solution and a hexamethylenetetramine solution, adjusting the pH value to 10-11, carrying out a high-temperature and high-pressure hydrothermal reaction to obtain zinc oxide nanorods, and carrying out ball milling treatment on the zinc oxide nanorods, microcapsules, stearic acid and zirconium oxide balls under the protection of argon to obtain doped microcapsules; after raw materials are pretreated, the raw materials and a dispersing agent solution are added into a mixer respectively, spraying powder, a pretreated base body and the spraying powder are obtained after mixing treatment, spraying treatment is conducted on the surface of the base body through a plasma spraying method, and the self-lubricating aluminum coating is obtained after vacuum annealing treatment. Therefore, the obtained self-lubricating aluminum coating is low in friction coefficient, high in performance and excellent in self-lubricating property.

The invention relates to the technical field of building, chemical engineering and energy heat preservation, and discloses a silicon-based aerogel composite material and a preparation method and application thereof. The invention relates to a light-emitting diode (LED) photo-curing agent, which is prepared from tetraethyl orthosilicate, methyltrimethoxysilane, allyltriethoxysilane, pentaerythritol tetra (3-mercaptopropionate), N-(3-(triethoxysilyl) propyl) furfuryl amine, N-(3-(triethoxysilyl) propyl) maleimide, a photoacid generator and a photoinitiator. The composite material has a three-dimensional porous silicon dioxide network skeleton and a polymer interpenetrating network, the three-dimensional porous silicon dioxide network skeleton is formed by copolymerization of tetraethyl orthosilicate and methyltrimethoxysilane, and the polymer interpenetrating network is formed by reaction of pentaerythritol tetra (3-mercaptopropionate) and allyltriethoxysilane. The preparation method comprises the steps of sol preparation, light curing, solvent replacement, surface hydrophobic modification and normal-pressure drying. The material shows excellent thermal insulation and mechanical properties in the fields of building heat insulation, pipeline heat preservation and cryogenic heat insulation.

The invention provides a multi-scale super-amphiphobic anti-wax coating and a preparation method thereof.The preparation method comprises the following steps that S1, cellulose nanofibers are added into an ethyl alcohol-water mixed solution, after ultrasonic treatment and uniform stirring are conducted, sodium methyl silicate is added for stirring reaction, then fluorosilane and tetraethoxysilane are added for hydrolytic condensation reaction, and a mixed solution is obtained; centrifuging and drying to obtain multi-scale fluorinated micro-nano particles; and S2, mixing the multi-scale fluorinated micro-nano particles, an adhesive and a diluent in proportion, performing ultrasonic stirring, spraying the mixture on a base material, and curing to obtain the multi-scale amphiphobic paraffin-proof coating. Hydrophobic modification is carried out on cellulose nanofibers by using fluorosilane, sodium methyl silicate and tetraethoxysilane to form a multi-scale micro-nano multilevel structure, and the structure can effectively capture air and is combined with ground surface energy, so that the coating has excellent super-amphiphobic performance.

The application belongs to the technical field of functional coating materials, and particularly relates to a kind of super-hydrophobic solution based on fumed silica and its preparation method and application, comprising: step one, 20-200nm fumed silica nanoparticles are dispersed in ethanol / water mixed system, and sodium dodecyl benzene sulfonate is added to prevent agglomeration;Step two, under the catalysis of ammonia, tetraethyl orthosilicate and 1H, 1H, 2H, 2H-perfluorodecyltriethoxysilane are added dropwise in sequence for fluorination modification;Step three, fluorinated silica nanoparticle suspension is prepared by ultrasonic-assisted reaction;Step four, the solution is sprayed onto the surface of ceramic substrate with micro-nano structure to form a coating;Step five, strong adhesion without adhesive is realized by mechanical anchoring effect.The application realizes super-hydrophobic performance of 153±0.5° high water contact angle and physical adhesion stability under 100-200g load by the synergistic effect of nanoparticle size effect and substrate surface topological structure, low surface energy of fluorinated alkyl chain and Cassie-Baxter air cushion layer effect, and is especially suitable for self-cleaning surface, anti-icing coating and marine corrosion prevention field.

The invention discloses a composite fiber membrane for hydrogen production and oxygen production through light-driven full water decomposition and a preparation method of the composite fiber membrane, and belongs to the technical field of photocatalysis technology and nano material preparation, and the composite fiber membrane shows excellent photothermal conversion performance in the reaction of hydrogen production and oxygen production through light-catalyzed water decomposition and also has efficient water transmission capacity. The stability and the reusability are relatively high. According to the preparation method, a Ti source compound, a Sr source compound, tetraethyl orthosilicate and a spinning solution are used as raw materials for electrostatic spinning, and after pre-oxidation and carbonization treatment at a certain temperature, the SrTiO3 / SiO2 composite carbon fiber membrane is obtained, and Cr2O3 / Rh and CoOOH cocatalysts are supported. The fiber membrane prepared by the invention has the function of photocatalytic water decomposition to produce hydrogen under the irradiation of sunlight, can stably produce hydrogen and oxygen in various water resources, is simple in process and low in cost, and can be widely applied to the fields of energy sources, environmental protection and the like.

The invention provides an aluminum oxide aerogel composite material as well as a preparation method and application thereof, and belongs to the technical field of aluminum oxide aerogel preparation. The preparation method provided by the invention comprises the following steps: (1) preparing aluminum sol by taking coal gangue as an aluminum source; (2) mixing the aluminum sol obtained in the step (1) with aluminum silicate fibers, and performing gelation to obtain composite hydrogel; and (3) mixing the composite hydrogel obtained in the step (2) with ethanol, aging, mixing with a modifier, modifying, and carrying out graded normal-pressure drying to obtain the aluminum oxide aerogel composite material, the modifier in the step (3) is one or more of absolute ethyl alcohol, tetraethoxysilane and normal hexane. The alumina aerogel composite material prepared by the preparation method provided by the invention has the characteristics of low density, low heat conductivity coefficient and high strength, and is suitable for the high-temperature processing field of special materials and the aerospace field.

The invention discloses a modified waterproof coating. Comprising the following components in parts by weight: 60-110 parts of cement; 60 to 160 parts of an acrylate polymer emulsion; 20 to 50 parts of modified diatomite; 20 to 50 parts of silicon nitride; 20 to 30 parts of talcum powder; 5 to 15 parts of a defoaming agent; and 2-10 parts of a silane coupling agent. The waterproof coating can better adapt to deformation of a cement substrate through the modified diatomite, the adaptability of the waterproof coating to different base layers is improved, and the permeation resistance of alkaline substances generated by wall curing is increased. The modified waterproof coating permeates into gaps of a wall surface, when the modified waterproof coating meets alkaline substances on the wall surface, tetraethyl orthosilicate of the modified waterproof coating is rapidly hydrolyzed under the catalysis of alkali to generate nano-scale silicon dioxide particles,-OH groups on the surfaces of the nano-scale silicon dioxide particles react with active Si-H bonds in hydrogen silicone oil, and the modified waterproof coating is formed. Therefore, hydrophobic groups are connected with the surfaces of nano silicon dioxide particles, the protection wall is florified, and the structure of a paint substrate is broken.

The invention relates to the technical field of rubber paint, in particular to rubber paint with good wear resistance and a preparation method thereof. The rubber paint is prepared from the following raw materials in parts by weight: 60-80 parts of chlorinated rubber, 30-50 parts of solvent, 20-40 parts of alkyd resin, 10-20 parts of polytetrafluoroethylene resin, 6-10 parts of epoxy resin, 6-10 parts of filler, 4-6 parts of additive, 2-4 parts of flatting agent, 1-3 parts of ultraviolet light absorber, 1-3 parts of dispersing agent and 1-3 parts of defoaming agent. According to the rubber paint, fluorosilane has the characteristic of low surface energy, a molecular layer with low surface energy can be formed on the surface of the rubber paint, the friction force borne by the surface of the rubber paint is small due to the low surface energy, the wear resistance of the rubber paint is improved, tetraethyl orthosilicate and ammonia water are matched to generate a hydrolytic condensation reaction, and silicon dioxide nanoparticles are generated; inorganic rigid components in the rubber paint are further increased, so that the overall hardness and wear resistance of the rubber paint are enhanced.

The invention relates to the technical field of metal materials, in particular to a ceramic reinforced aluminum alloy composite material and a preparation method thereof. The aluminum alloy composite material comprises the following raw materials in parts by weight: 75-85 parts of an aluminum alloy matrix and 10-20 parts of a ceramic reinforced phase, a preparation method of the ceramic reinforced phase comprises the following steps: step 1, adding silicon carbide and a silane coupling agent into absolute ethyl alcohol, and drying after ultrasonic dispersion; 2, dissolving tetraethoxysilane in an ethanol-water mixed solvent, adjusting the pH value to 3-4, adding the silicon carbide treated in the step 1, stirring to form sol, drying, converting into gel, and calcining to form a coating layer; step 3, dispersing the silicon carbide treated in the step 2 into water, adding nickel nitrate, uniformly stirring, adding a reducing agent, stirring for reaction, and collecting precipitate particles; and 4, adding an interface modifier, and uniformly mixing. The ceramic reinforced aluminum alloy composite material has high strength, high wear resistance and good mechanical property and thermal stability.

The application discloses a kind of nano magnetic flocculants and its preparation method and application, belong to drinking water processing technical field, including the following steps: step S1, modified ferroferric oxide nanosphere is ultrasonically dispersed in ammonia alcohol solution, while stirring, slowly drop adding tetraethyl orthosilicate, continue stirring after drop, after centrifugal separation, wash, obtain silica coated ferroferric oxide nanoparticles;Step S2, phenylalanine modified chitosan is added into glacial acetic acid solution, after completely swelling and dissolving, add silica coated ferroferric oxide nanoparticles and ultrasonic treatment, under low pressure ultraviolet lamp, then with anhydrous ethanol wash purification, vacuum drying to constant weight, obtain nano magnetic flocculants;The method of the application is simple and easy to operate, the nano magnetic flocculants prepared can be quickly adsorbed to the surface of sulfonamide antibiotics, produce flocculation and can be magnetically separated, very suitable for trace sulfonamide antibiotics in drinking water source efficient removal.

The invention relates to a preparation method of silicon dioxide-boron nitride nanobelt aerogel, which comprises the following steps: dissolving melamine and boric acid in a co-solvent of tert-butyl alcohol and hot deionized water, stirring and mixing, carrying out ultrasonic treatment, freeze-drying and the like to obtain a melamine-boric acid aerogel precursor, placing the precursor in a tubular furnace, and carrying out vacuum drying to obtain the silicon dioxide-boron nitride nanobelt aerogel. Pyrolyzing in an ammonia gas atmosphere to obtain boron nitride nanobelt aerogel; and placing the boron nitride nanobelt aerogel in a xylene solution containing tetraethoxysilane and silicon tetrachloride, taking out the boron nitride nanobelt aerogel, and drying the boron nitride nanobelt aerogel. And hydrolyzing and pyrolyzing in an inert atmosphere to form a silicon dioxide layer on the surface, thereby obtaining the silicon dioxide-boron nitride nanobelt aerogel. The silicon dioxide and boron nitride nanobelt aerogel is low in density and excellent in mechanical property and oxidation resistance.

The invention belongs to the technical field of electronic packaging materials. The invention relates to the field of electronic packaging, in particular to a flexible high-barrier film for electronic packaging and a preparation method thereof. The preparation method comprises the following specific preparation steps: substrate activation: activating the upper surface and the lower surface of a polymer substrate to regulate the surface energy of the two surfaces to be greater than or equal to 50mN / m respectively, so as to obtain an activated substrate; coating an organic buffer layer: coating a water-based organic coating on the two surfaces of the activated substrate, and curing and forming to obtain the organic buffer layer with the water content of 15-20%, the thickness of 10-15 microns and the roughness Ra of 0.08-0.12 microns; depositing an inorganic layer: pulse gaseous trimethylaluminum and tetraethoxysilane mixed gas on the surface of the organic buffer layer, then pulse with water vapor, and circulating the pulse so as to deposit the inorganic layer with the thickness of 15-20nm on the surface of the organic buffer layer; and stacking and packaging: stacking the organic buffer layer and the inorganic layer for 8-10 cycles, then covering the organic buffer layer and the inorganic layer with a UV curing adhesive, and annealing to obtain the flexible high-barrier film for electronic packaging.

The invention discloses preparation of flame-retardant recyclable compressible recoverable degradable chitosan aerogel and infrared camouflage application of the flame-retardant recyclable compressible recoverable degradable chitosan aerogel, and belongs to the technical field of aerogel materials. The preparation method of the aerogel comprises the following steps: (1) mixing and stirring chitosan and water to obtain a chitosan solution, then adding phosphorus / nitrogen-containing bridged organosiloxane and tetraethyl orthosilicate into the chitosan solution, and then stirring to obtain white uniform turbid liquid; and (2) heating and curing the white suspension, then precooling, and finally freeze-drying to obtain the flame-retardant recyclable compressible recoverable degradable chitosan aerogel. The aerogel provided by the invention is a chitosan-based aerogel material integrating flame retardance, heat insulation, cyclic compression, recycling, degradation and other properties, has good heat insulation performance, can effectively shield infrared radiation, and has great application prospects in infrared camouflage.

The invention provides a preparation method and application of a composite gel electrolyte, and relates to the technical field of electrochemical energy storage, and the preparation method comprises two steps of preparation of MXene-SiO2 and preparation of the composite gel electrolyte. Etched MXene, CTAB (cetyltrimethyl ammonium bromide) and NaOH are mixed and stirred, then TEOS (tetraethyl orthosilicate) is added to react under a water bath condition, washing and freeze drying are performed to obtain a required target product MXene-SiO2, and the composite gel electrolyte comprises a polymer monomer, a cross-linking agent, an initiator, zinc salt and a proper amount of MXene-based additive. The problem of poor compatibility between the solid electrolyte and an electrode interface can be improved, so that the cycle performance of the zinc ion battery is improved. The composite gel electrolyte obtained by the invention has the characteristics of high thermal stability and the like, and has high ionic conductivity, wide electrochemical window and good mechanical durability.

The invention belongs to the technical field of functional nano materials, and particularly relates to a preparation method of a detachable engine type braking nano motor, a nano drug carrier is jointly composed of HMSN and CAT modified PNA, tetraethyl orthosilicate serves as a silicon source, and solid silicon dioxide balls are synthesized; on the basis, tetraethyl orthosilicate is used as a silicon source, CTAB is used as a pore-forming agent to synthesize mesoporous silica coated solid silica spheres; etching the core silicon dioxide ball through sodium carbonate to obtain a hollow mesoporous silicon dioxide ball; then, amino modification is carried out on the CAT modified PNA2 through 3-aminopropyltrimethoxysilane, PNA1 is connected with HMSN through an amido bond, and a double-chain structure is formed by the CAT modified PNA2 and PNA1 through complementary base pairing. According to the nano motor provided by the invention, the engine CAT of the nano motor can be detached by adding the unwinding chain PNA3, so that in-vivo deceleration and braking are realized.

The invention discloses a high-self-cleaning weather-resistant GRTV insulating coating for electrical equipment, which comprises the following components: a film-forming agent consisting of solvent-type fluororesin, hydroxyl-terminated polysiloxane, acrylic resin and polyether polyol, a reinforcing agent consisting of at least two of MQ silicon resin, silicon dioxide, silicon nitride and fluororesin micro powder, a filling agent consisting of aluminum oxide, a curing agent consisting of a curing agent and a solvent, the curing agent is composed of two or three components of tetraethoxysilane, methyltriacetamide silane, dimethyl diacetamide silane or dibutyltin oxide, and trichloroethylene or butyl acetate is used as an organic solvent; the anti-pollution flashover coating is good in adhesive force, excellent in electrical insulation performance, good in hydrophobicity, high in anti-pollution flashover capacity, excellent in mildew resistance, algae resistance and anti-burst scattering characteristic, good in self-cleaning performance and capable of better exerting the anti-pollution flashover efficiency under the conditions of high salinity, high humidity and heavy pollution, and the insulation strength is not affected by environment temperature and moisture.

The application belongs to the technical field of nano energy, and particularly relates to a modified cellulose aerogel preparation method and application. Hybrid nanosheets are synthesized through a hydrothermal reaction, then grafted to the surface of cellulose through tetraethyl orthosilicate, and finally formed into cellulose aerogel through dissolution and regeneration. The balance between low pressure drop and high filtration efficiency is achieved through mechanical interception and electrostatic induction, and strong and stable filtration performance is exhibited even under high humidity conditions. A sterilization rate of 99.9% can be achieved in 20 min, the device can accurately detect and quickly respond to 1 ppm NH3, and the response rate to 100 ppm NH3 reaches 77% in 12 seconds. Even after 7 cycles of testing-washing, the filtration performance, sterilization and ammonia gas responsiveness of the material still maintain excellent stability. The application provides a new method for developing multifunctional self-powered biomass-based wearable medical devices in extreme environments.

The invention belongs to the technical field of chemical preparation of nano-porous materials, and relates to core-shell type porous silicon dioxide microspheres, a preparation method thereof and application of the core-shell type porous silicon dioxide microspheres in structural color. The preparation method comprises the following steps: (1) mixing absolute ethyl alcohol, ammonia water and deionized water to obtain alkaline hydrolysate; (2) mixing tetraethyl orthosilicate with organosilane to obtain a silane mixed solution; (3) simultaneously and respectively dropwise adding the alkaline hydrolysate and the silane mixed liquid into the silicon dioxide microsphere dispersion liquid under stirring, and reacting to obtain an intermediate; and (4) calcining the obtained intermediate at 550-650 DEG C to obtain the core-shell type porous silicon dioxide microspheres. The preparation method of the core-shell type porous silicon dioxide microspheres is simple, easy to operate and mild in condition. The raw materials are simple, easy to obtain, non-toxic and harmless, a surfactant and a template agent are not needed, and the cost is greatly reduced.

The invention belongs to the field of metal corrosion and protection, and particularly relates to a heat-resistant self-repairing zinc silicate anticorrosive coating and a preparation method thereof. The coating comprises a component A and a component B in a mass ratio of 100: 43, the component A comprises ethanol, xylene, a rheological additive, zinc powder and a filler; the component B comprises tetraethoxysilane, a hydrochloric acid solution, absolute ethyl alcohol and a solvent; the filler is a composition of two or more of low-melting-point glass powder, zinc oxide powder, conductive mica powder and lamellar graphene powder. The coating has an environment response type protection structure through new filler components and size adjustment, so that the high temperature resistance of the zinc silicate coating, the adhesive force after heat influence and the anti-corrosion self-repairing performance are improved.