33results about How to "Nano size effect" patented technology

The invention provides a flexible stretchable electromagnetic shielding fabric and a preparation method thereof. The method for preparing the flexible stretchable electromagnetic shielding fabric comprises the following steps: selecting a spandex stretch fabric as an elastic adhesion matrix, applying a certain tension to two ends of the fabric, stretching the fabric to a certain elongation and fixing, and coating a layer of liquid elastic adhesives on the surface of the elastic adhesion matrix; performing pressure dipping on a flexible nano electromagnetic shielding composite film on the liquid elastic adhesives, coating a layer of liquid elastic adhesives on the upper side of the flexible nano electromagnetic shielding composite film, allowing the composite film to be adhered to another spandex stretch fabric, and curing the adhesives under a certain conditions; releasing the tension applied to the elastic adhesion matrix so as to drive the flexible nano electromagnetic shielding composite film to retract, thereby obtaining the flexible stretchable electromagnetic shielding fabric. The flexible stretchable electromagnetic shielding fabric disclosed by the invention has the characteristics of high elasticity, high elongation, excellent electromagnetic shield property and the like.

The invention discloses a preparation method for a thermally-induced infrared-emission-rate-variable vanadium dioxide thin sheet. The method includes the steps of: (A) with metavanadate, citric acid and deionized water as initial raw materials, stirring and mixing the raw materials uniformly according to certain ratio, and moving the mixture into a hydrothermal kettle to perform a hydrothermal reaction; and (B) when the reaction is finished, performing centrifugation, washing and vacuum drying to obtain nano vanadium dioxide powder, pressing the powder into thin sheets, and annealing the thin sheets to prepare the thermally-induced infrared-emission-rate-variable vanadium dioxide thin sheet. The preparation method is simple. The raw materials are toxic-free and low-cost. The product has good crystallinity. The vanadium dioxide thin sheet achieves intensive change in infrared emission rate at about room temperature with abrupt change value reaching 0.34. The thin sheet has high mechanical strength, is not liable to break, is convenient to mechanically process, can be processed into different sizes and pasted to required positions in practical utilization, is convenient to use and has wide application prospect in the fields of infrared stealth and military camouflage.

The invention provides a flexible stretchable electromagnetic shielding film and a preparation method thereof. The preparation method of the flexible stretchable electromagnetic shielding film comprises the following steps: selecting an elastic membrane as an elastic adhesion matrix, stretching the elastic membrane to a certain elongation, then fixing the elastic membrane, and coating a liquid elastic adhesive layer on the surface of the elastic membrane; crushing a flexible nano electromagnetic shielding complex film on the liquid elastic adhesive layer, coating resin with protective effect at the upper side of the flexible nano electromagnetic shielding complex film to form a resin layer, and curing the liquid elastic adhesive and the resin under certain conditions; and releasing a tensile force applied onto the elastic adhesion matrix, so as to drive the flexible nano electromagnetic shielding complex film to retract, namely the flexible stretchable electromagnetic shielding film is obtained. The prepared flexible stretchable electromagnetic shielding film has good elasticity, high elongation (20-50%) and excellent electromagnetic shielding property (electromagnetic wave absorptivity is more than or equal to 99% at the frequency of 1-5GHz) and can bear certain bending and compression deformation.

The invention discloses a method for synchronously preparing multiple biomass materials. The method specifically comprises the following steps: adding waste biomass into an acid solution, carrying outhydrothermal treatment, and carrying out solid-liquid separation to obtain a treatment solution; and carrying out centrifugal separation on the treatment solution to obtain lower-layer precipitate and a supernatant, adding an anti-solvent into the supernatant, carrying out centrifugal separation to obtain precipitate, ie., lignin nanoparticles, and dialyzing the obtained supernatant to obtain a carbon quantum dot solution, wherein the lower-layer precipitate is a cellulose crystal. According to the method of the invention, multiple biomass materials including cellulose crystals (-400 nm), lignin nanoparticles (-100 nm) and carbon quantum dots (2-5 nm) can be rapidly and synchronously prepared from waste biomass so as to substantially improve the universality of the traditional nanometer material preparation method; and the preparation method is rapid, simple, easy for industrial production and low in cost.

The invention provides a preparation method of food-borne fluorescent nanoparticles. The preparation method comprises the following steps: S1: baking salmon or Spanish mackerel at 150 to 350 DEG C for10 to 150 min; S2, immersing a baked sample into a polar organic solvent and extracting; carrying out rotary evaporation on an extracted mixed solution until the polar organic solvent is completely removed, wherein the mass and volume ratio of the sample to the polar organic solvent ranges from (1 to 1) to (1 to 3) and the extracting time is 2 to 48h; S3: re-dissolving by adopting water and a non-polar organic solvent and carrying out liquid separation to remove a non-polar organic solvent layer; adding the non-polar organic solvent and repeatedly extracting and degreasing until a water-phasesolution is clarified and transparent, wherein the mass and volume ratio of the sample to the non-polar organic solvent added each time ranges from (1 to 1) to (1 to 3); enabling water-soluble extract to be subjected to liquid column chromatography for collecting a fluorescent part; carrying out freeze-drying to obtain the product. The method provided by the invention breaks through a traditionalfluorescent nanoparticle preparation manner and has the advantages that a preparation process is simple and a prepared case has high biological safety and the like.

The invention discloses a paste water-based isolation agent, a preparation method and an application method thereof thereof. The paste water-based isolation agent comprises the following components by mass: 3-5 parts of an inorganic powder additive, 0.1-1.0 part of an anionic surfactant, 0.5-5.5 parts of a nonionic surfactant, 5-10 parts of a thixotropic agent, 0.2-2.0 parts of a thickener, 0.1-0.5 part of a defoaming agent, and 60-100 parts of deionized water. The preparation method consists of: mixing water with the surfactants, conducting stirring dissolving, adding the inorganic powder additive, and adding the defoaming agent dropwise, adding the thixotropic agent and thickener in batches, stirring the materials fully, and performing grinding to a homogeneous phase, thus obtaining the isolation agent. And the application method includes: during use, preparing the isolation agent into a water solution according to a mass ratio of 1:3-15, adding the water solution into a water cooling groove of a rubber slice to realize isolation agent coating at the same time of water cooling, and then carrying out rod hanging drying and stacking. The paste water-based isolation agent provided by the invention has the advantages of easy water dissolution, no toxicity, no smell, simple process and low cost, and almost has no effect on the subsequent processing performance of rubber.

The invention discloses composite nano zirconium oxide with uniform particle size distribution, and a continuous preparation method and equipment thereof. The continuous preparation method comprises following steps: a zirconium oxide precursor and a stabilizing agent precursor are uniformly mixed, are delivered into a reactor by a carrier gas, are reacted with water vapor at a high temperature, and are subjected to rapid decomposition at the high temperature so as to obtain a composite nano zirconium oxide powder. The particle size of the obtained composite nano zirconium oxide ranges from 5 to 15nm, the stacking density is 0.2g / cm<3> or lower. The equipment comprises a feed system, a reaction system, and a product collecting system. The composite nano zirconium oxide prepared via the continuous preparation method is low in particle size and density, and exists in the form of aerosol. Multistage post-processing product collection and tail gas treatment are adopted in the equipment, so that a technical problem the effective collecting of composite nano zirconium oxide particles is difficult to realize is solved, product yield is increased, and air pollution caused by effusion of solid dust is prevented.

The invention discloses a preparation method of a functional PU-AOPAN (polyurethane-amidoximepolyacrylonitrile) composite nanofiber membrane, comprising the steps of first, dissolving PU and PAN in an electrostatic spinning polar organic solvent, preparing electrostatic spinning solution with PU and PAN accounting for 8-12% by weight of total weight, and preparing a PU-PAN composite nanofiber membrane by electrostatic spinning process; second, subjecting the PU-PAN composite nanofiber membrane to amidoximation modification to obtain the PU-AOPAN composite nanofiber membrane. The defects are improved that PAN and PU are poor in hydrophilic performance and have few surface functional groups; the PU ingredient is introduced to functional nanofiber, the mechanical properties of amidoximepolyacrylonitrile are greatly improved, and the practical applicability of amidoximepolyacrylonitrile can be greatly enhanced.

The invention relates to an electromagnetic shielding composite fabric as well as preparation and application thereof. The electromagnetic shielding composite fabric comprises: a carbon nanotube / graphene composite film (1), a polyaniline thin film (2), a binding agent (3) and a base fabric (4), wherein graphene in the carbon nanotube / graphene composite film is compounded on the upper surface of a carbon nanotube film; the polyaniline thin film is adhered to the lower surface of the carbon nanotube film through the binding agent. The preparation comprises: depositing a graphene suspension solution on one layer of a carbon nanotube thin film and naturally airing at room temprature to obtain a graphene / carbon nanotube composite film; adhering the polyaniline thin film on the lower surface of the carbon nanotube thin film through the binding agent to obtain a carbon nanotube / graphene / polyaniline composite film; the base fabric is adhered to the surface of the carbon nanotube / graphene / polyaniline composite film through the binding agent and then is cured to obtain the product. The electromagnetic shielding composite fabric prepared by the invention has a good electromagnetic shielding performance and can also keep the characteristics of air permeability, flexibility, foldability, binding property and the like of a fabric material.

The invention belongs to the technical field of anticorrosive coatings, and specifically relates to a metal base waterborne graphene modified long-acting anticorrosive paint and a preparation method thereof. The metal base waterborne long-lasting anticorrosive paint comprises the following raw materials in parts by weight: 40-50 parts of composite modified styrene-acrylic emulsion, 10-20 parts ofmodified graphene, 15-25 parts of pigment, 0.5-1 part of an antifoaming agent, 0.3-0.8 part of a leveling agent, 0.5-1 part of a waterborne drier, 0.5-1 part of a wetting agent, 0.8-1.2 parts of an anti-settling agent, 0.1-0.5 part of a dispersant, and 20-35 parts of deionized water. The preparation method comprises: (1) preparation of modified graphene; (2) pigment surface modification; and (3) preparation of the waterborne paint. The metal base waterborne graphene modified long-acting anticorrosive paint has the advantages of long-lasting excellent anticorrosive performance, strong base adhesion, high mechanical strength, excellent friction resistance, excellent solvent resistance and weather resistance, strong construction adaptability and the like; the preparation method is simple, easy to operate, low in raw material and energy consumption costs, environmentally-friendly and pollution-free; the coating is quickly dried, and the construction period is short.

The invention provides a forming processing method for preparing a cross-linked high-molecular polymer material, and belongs to the technical field of material processing. The method comprises the steps that thermosetting cross-linked high-molecular polymer nano-microspheres are obtained; according to the obtained thermosetting cross-linked high-molecular polymer nano-microspheres, a decompositiontemperature of the thermosetting cross-linked high-molecular polymer nano-microspheres is obtained; the thermosetting cross-linked high-molecular polymer nano-microspheres are prepressed and compacted, at the same time, kept in high vacuum to exclude gas in the thermosetting cross-linked high-molecular polymer nano-microspheres; according to the decomposition temperature, the prepressed and compacted thermosetting cross-linked high-molecular polymer nano-microspheres are heated, so that the thermosetting cross-linked high-molecular polymer nano-microspheres are softened; the heated thermosetting cross-linked high-molecular polymer nano-microspheres are cooled, so that the high-molecular polymer material is prepared. According to the method, the technical effect is achieved that in the process of preparing the high-molecular polymer material, and under the conditions of below the decomposition temperature and high pressure, the polymer material is once again processed and formed.

The invention discloses a paste-like water-based rubber release agent and its preparation method and application method. Its components include 3-15 parts of inorganic powder additives, 0.1-1.0 parts of anionic surfactant, and 0.5-1.0 parts of anionic surfactant in parts by mass. 5.5 parts of nonionic surfactant, 5-10 parts of thixotropic agent, 0.2-2.0 parts of thickener, 0.1-0.5 parts of defoamer, 60-100 parts of deionized water. Mix water and surfactant, stir to dissolve, add inorganic powder additives, add defoamer dropwise, add thixotropic agent and thickener in batches, stir well and grind until homogeneous to obtain the release agent. When in use, make an aqueous solution at a mass ratio of 1:3 to 15, add it to the water cooling tank of the film, the film is cooled by water while the release agent is applied, and it can be stacked after air drying on the hanging rod. The invention is easily soluble in water, non-toxic, tasteless, simple in process and low in cost, and basically has no influence on the subsequent processing performance of rubber.

The invention relates to the technical field of coatings and in particular relates to an environment-friendly polyurethane waterproof coating and a preparation method thereof. The environment-friendly polyurethane waterproof coating comprises components A and B. The component A comprises the following substances in parts by weight: 20-30 parts of polyether glycol, 30-50 parts of polyether triol, 3-6 parts of montmorillonite, 3-6 parts of nano silicon dioxide and 4-7 parts of methylbenzene-2,4-diisocyanate; the component B comprises the following substances in parts by weight: 6-8 parts of water, 0.5-1 part of a dispersant, 8-12 parts of petroleum fraction oil, 3-6 parts of calcium hydroxide, 3-6 parts of talc powder, 3-6 parts of light calcium carbonate and 0.3-0.6 part of a plasticizer. By taking water or other diamines and polyhydric alcohol as a curing agent, the coating does not contain volatile organic compounds, so that the coating is harmless to the environment and has excellent mechanical properties and anti-ageing property.

The invention discloses a polyethylene terephthalate composite mesoporous membrane, a preparation method and application thereof, and belongs to the field of membrane materials. That is, the mesoporous material silica is assembled in the polyethylene terephthalate film to form a composite mesoporous film. The preparation method is to assemble the inorganic mesoporous material in the holes in the polyethylene terephthalate membrane by suction filtration to obtain a composite mesoporous membrane, and then remove the intermediary of the composite membrane by extraction and elution. The surfactant in the porous material is used to obtain a polyethylene terephthalate composite mesoporous membrane. The preparation method of the present invention has the characteristics of simplicity and rapidity. In addition, the polyethylene terephthalate composite mesoporous membrane can be applied not only to size-selective molecular transfer and separation in aqueous solution but also to Size-selective ion transfer at liquid / liquid interfaces, etc.

The invention relates to a textile anhydrous coloring method. The method comprises the following steps: taking textile fabric as a substrate and an inorganic pigment as a target material, and the inorganic pigment is deposed to the surface of the textile fabric by using a physical vapor deposition plating technology. Through the physical vapor deposition plating technology, a coloring purpose can be achieved by depositing the uniform and compact inorganic pigment on the surface of the textile, process is simple and convenient, no waste water is generated and no exhaust gas is discharged during a whole production process, pigment utilization rate is high, operationality is strong, batch production is easy, and the method has nanoscale effect as well as firm combination of the inorganic pigment and the textile substrate.

The invention discloses a preparation method of a lignin nanoparticle and belongs to the chemical field of nanometer materials. The preparation method comprises the following steps of: dissolving a lignin raw material through an organic solvent; removing impurities; dropwise adding a proper amount of inorganic acid into filtrate to form lignin colloid; adding a cross-linking agent to perform cross-linking reaction with the lignin colloid; and adding water and stirring to dialyze to form lots of lignin nanoparticles of which the particle size is between 20nm to 200nm. The prepared lignin nanoparticle is excellent in dispersing performance and absorbing performance, and is expected to be applied to dispersing agents for wastewater treatment, dye, pesticide, water-coal-slurry systems and the like. The preparation method, disclosed by the invention, is simple and feasible; all the adopted solutions can be recovered, no adverse impacts are brought to the environment, and good application prospect is provided.

The invention relates to an electromagnetic shielding composite membrane material and preparation and application thereof. The electromagnetic shielding composite membrane material comprises a graphene / carbon nanotube composite membrane (1), a polyaniline membrane (2) and protective layer resin (4). The polyaniline membrane (2) adheres to the surface of a carbon nanotube thin film in the graphene / carbon nanotube composite membrane through an adhesive (3). The preparation includes the steps that graphene suspension liquid is deposited on the carbon nanotube thin film, and the mixture is naturally aired at room temperature to obtain the graphene / carbon nanotube composite membrane; the polyaniline membrane adheres to the surface of the carbon nanotube thin film in the graphene / carbon nanotube composite membrane through the adhesive to form a graphene / carbon nanotube / polyaniline composite membrane; then the upper surface and the lower surface of the composite membrane are coated with the resin, curing is carried out, and the electromagnetic shielding composite membrane material is obtained. The electromagnetic shielding performance of the electromagnetic shielding composite membrane material is excellent, and meanwhile the electromagnetic shielding composite membrane material can bear certain bending and compression deformation; the flexible electromagnetic shielding membrane can be widely applied to the fields such as intelligent wearable garments and multifunctional electromagnetic protection fabric.

The invention provides a printing and dyeing wastewater treatment agent and a treatment method. The printing and dyeing wastewater treatment agent comprises a modified nano-starch adsorbent and a modified nano-starch flocculant. According to the treatment agent, nano-starch is adopted to serve as an adsorbent matrix, and citric acid is added for esterification crosslinking with nano-starch particles; and then acrylamide is grafted to the nano-starch particles through a potassium persulfate initiator to obtain the modified nano-starch adsorbent. Besides, the nano-starch is further adopted to serve as a flocculant matrix, 3-chloro-2-hydroxypropyl trimethylammonium chloride is used as a cationic etherifying agent, sodium hydroxide is used as a catalyst, and the modified nano-starch flocculantis prepared. The invention further provides the treatment method of the printing and dyeing wastewater. According to the treatment method, firstly, the pH value of the to-be-treated printing and dyeing wastewater is regulated; and the modified nano-starch adsorbent and the modified nano-starch flocculant are sequentially added in two steps and are stirred for a full reaction. Through the treatment method, the dye and heavy metal pollutant adsorption and flocculation properties are excellent without secondary pollution.

The invention relates to the field of polyethylene composite materials, in particular to a preparation technology for a carbon nanotube / nickel / aluminum in-situ enhanced polyethylene based composite material, and aims to provide a method for keeping controllable contents and uniform dispersion and distribution of the carbon nanotubes and metal composite powder in a polymer based composite materialand keeping good interface infiltration of carbon tubes and a base and high binding strength. The method comprises the following steps of: synthesizing CNTs (Carbon Nanotubes)-Ni-Al composite powder with uniformly dispersed CNTs, excellently kept structure and controllable content by using a chemical vapor deposition method; and doping the in-situ composite powder into a polyethylene base by using a melt blending method so as to prepare the CNTs / Ni / Al / polyethylene based composite material with high strength and modulus and excellent conductivity and heat-conducting property. By adopting the composite powder, the proportion of the carbon nanotubes, nickel and aluminum can be controlled excellently; meanwhile, the problem of dispersion of the metal and the carbon nanotubes in the composite material can be solved well; the carbon nanotubes do not agglomerate in the composite powder and are widely dispersed to achieve a nano-size effect; and the carbon nanotubes have high binding strengthwith the base, so that the polyethylene based composite material can be effectively enhanced by the carbon nanotubes and the aluminum, and the comprehensive performances such as strength, conductivity, heat conduction and the like of the composite material are greatly improved.

The invention discloses a method for quickly synchronously preparing lignin nano-particles and carbon quantum dots. The method includes particular steps of adding abandoned biomass into acid solution,carrying out microwave treatment, and then separating solid from liquid to obtain treating fluid; centrifugally separating the treating fluid to obtain lower-layer precipitates and supernatant liquor. The lower-layer precipitates are the lignin nano-particles, the supernatant liquor is nitrogen-doped carbon quantum dot solution, and solvents in the acid solution are mixed solvents with ethyl alcohol. The method has the advantages that biomass nano-materials with different sizes can be quickly synchronously prepared from the abandoned biomass by the aid of the method and include the lignin nano-particles (with the sizes of 100 nm) and the fluorescent nitrogen-doped carbon quantum dots (with the sizes of 2-3 nm), and accordingly the universality of the traditional method for preparing the nano-materials can be greatly improved; the method is quick, green and simple and is low in cost, and industrial production can be facilitated.

The invention belongs to the technical field of anticorrosive coatings, and specifically relates to a metal base waterborne graphene modified long-acting anticorrosive paint and a preparation method thereof. The metal base waterborne long-lasting anticorrosive paint comprises the following raw materials in parts by weight: 40-50 parts of composite modified styrene-acrylic emulsion, 10-20 parts ofmodified graphene, 15-25 parts of pigment, 0.5-1 part of an antifoaming agent, 0.3-0.8 part of a leveling agent, 0.5-1 part of a waterborne drier, 0.5-1 part of a wetting agent, 0.8-1.2 parts of an anti-settling agent, 0.1-0.5 part of a dispersant, and 20-35 parts of deionized water. The preparation method comprises: (1) preparation of modified graphene; (2) pigment surface modification; and (3) preparation of the waterborne paint. The metal base waterborne graphene modified long-acting anticorrosive paint has the advantages of long-lasting excellent anticorrosive performance, strong base adhesion, high mechanical strength, excellent friction resistance, excellent solvent resistance and weather resistance, strong construction adaptability and the like; the preparation method is simple, easy to operate, low in raw material and energy consumption costs, environmentally-friendly and pollution-free; the coating is quickly dried, and the construction period is short.

The invention discloses composite nano zirconium oxide with uniform particle size distribution, and a continuous preparation method and equipment thereof. The continuous preparation method comprises following steps: a zirconium oxide precursor and a stabilizing agent precursor are uniformly mixed, are delivered into a reactor by a carrier gas, are reacted with water vapor at a high temperature, and are subjected to rapid decomposition at the high temperature so as to obtain a composite nano zirconium oxide powder. The particle size of the obtained composite nano zirconium oxide ranges from 5 to 15nm, the stacking density is 0.2g / cm<3> or lower. The equipment comprises a feed system, a reaction system, and a product collecting system. The composite nano zirconium oxide prepared via the continuous preparation method is low in particle size and density, and exists in the form of aerosol. Multistage post-processing product collection and tail gas treatment are adopted in the equipment, so that a technical problem the effective collecting of composite nano zirconium oxide particles is difficult to realize is solved, product yield is increased, and air pollution caused by effusion of solid dust is prevented.

The invention discloses a dynamic solvent-responsive nanofiber-based flexible transparent composite membrane and a preparation method thereof, belonging to the technical field of composite membranes. The composite film is a three-dimensional network structure formed by the cross-linking reaction of nanofibers and monomers with a refractive index between 1.48 and 1.6 in the nanofiber gap. The transparency of the composite film is regulated by controlling the ratio of nanofibers to monomers. And for the transparent composite film, it can undergo a reversible change from transparent to opaque under the stimulation of a solvent or water vapor with a refractive index distribution between 1.3 and 1.4. The composite film can be widely used in the fields of architecture, interior decoration design, culture and education, meeting rooms and the like.

The invention discloses a tungsten carbide / porous carbon composite material, its preparation method and its application in electrochemical hydrogen production. The tungsten carbide / porous carbon composite material has nano size effect and high porosity. Tungsten carbide and The porous carbon materials doped with heterogeneous heteroatoms are tightly combined and can catalyze collaboratively, improving stability. Therefore, the composite material exhibits good catalytic properties in the electrochemical hydrogen production process, as well as good stability that noble metals do not possess. Efficient use of energy is achieved. The method of the present invention has a simple preparation process, uses tungsten abundant in nature as raw material, and realizes the effective utilization of tungsten resources.

The invention provides a flexible stretchable electromagnetic shielding fabric and a preparation method thereof. The method for preparing the flexible stretchable electromagnetic shielding fabric comprises the following steps: selecting a spandex stretch fabric as an elastic adhesion matrix, applying a certain tension to two ends of the fabric, stretching the fabric to a certain elongation and fixing, and coating a layer of liquid elastic adhesives on the surface of the elastic adhesion matrix; performing pressure dipping on a flexible nano electromagnetic shielding composite film on the liquid elastic adhesives, coating a layer of liquid elastic adhesives on the upper side of the flexible nano electromagnetic shielding composite film, allowing the composite film to be adhered to another spandex stretch fabric, and curing the adhesives under a certain conditions; releasing the tension applied to the elastic adhesion matrix so as to drive the flexible nano electromagnetic shielding composite film to retract, thereby obtaining the flexible stretchable electromagnetic shielding fabric. The flexible stretchable electromagnetic shielding fabric disclosed by the invention has the characteristics of high elasticity, high elongation, excellent electromagnetic shield property and the like.

The invention discloses a water-resistant enhanced synergistic anti-oxidation composite film and a preparation method thereof. The steps are as follows: take a filmed eggshell and soak it in acetic acid until the shell and film are separated to obtain eggshell film powder and calcium acetate buffer solution; Eggshell membrane powder is dispersed in deionized water, and placed in a high-pressure reactor for reaction; after the reaction, the supernatant is centrifuged, filtered, and dialyzed to obtain carbon quantum dot powder; eggshell membrane powder is dispersed in deionized water, enzymatically hydrolyzed, Obtain the enzymatic solution, centrifuge, take the supernatant to freeze-dry, and then use cation exchange chromatography to obtain the antioxidant polypeptide; dissolve chitosan in calcium acetate buffer, add glycerin and stir; add carbon quantum dot powder and polypeptide respectively , ultrasonic; and then either use a 3D printer to print a composite film with good air permeability, or pour it on a disposable petri dish to dry to obtain a composite film. The purpose of the invention is to realize the high value-added utilization of eggshells, and at the same time solve the technical problems of poor mechanical properties and water resistance of the chitosan film.

Belonging to the technical field of anticorrosive paint, the invention in particular relates to a metal substrate graphene modified long-acting anticorrosive paint and a preparation method thereof. The metal substrate graphene modified long-acting anticorrosive paint consists of a component A and a component B. The component A is composed of the following raw materials by weight: 40-50 parts of epoxy resin, 10-20 parts of modified graphene, 15-20 parts of pigment, 15-20 parts of a cosolvent, 0.3-0.8 part of a defoamer, 0.3-0.8 part of a leveling agent, 0.5-1 part of an anti-settling agent and0.5-1 part of a dispersant; the component B is composed of the following components by weight: 50-60 parts of etherified amino resin, 25-35 parts of phenolic aldehyde amine, and 20-30 parts of a cosolvent. The metal substrate graphene modified long-acting anticorrosive paint provided by the invention has the advantages of long-lasting and excellent anticorrosive performance, strong substrate adhesion, high mechanical strength, excellent friction resistance, excellent salt fog resistance, good water resistance, chemical resistance, oil resistance and impact resistance, strong construction adaptability, etc. The operation method is simple and is easy to operate, is low in raw material and energy consumption cost, and is environment-friendly and pollution-free, the coating film dries quickly,and the construction period is short.

The invention relates to a bifunctional electrode material for a zinc-air battery and a preparation method and application of the bifunctional electrode material. The electrode material is a nano carbon fiber porous material loaded with Co@CoxSy (x is greater than or equal to 0, y is greater than or equal to 0) nano particles; and the porosity of the surface and the synergistic effect between active sites and a carbon carrier greatly improve the utilization and conversion efficiency of energy in the rechargeable zinc-air battery, so that the material has a discharging function and a charging function at the same time. According to the Co@CoxSy / NC nanofiber prepared by the method, the raw materials are easy to obtain, the price is low, the preparation process is simple and convenient, and the chemical stability is good. The Co@CoxSy nano particles in the Co@CoxSy / NC nano fibers are relatively uniform in particle size, and can be uniformly distributed on the surface of the carbon nanofibers; the prepared Co@CoxSy / NC nanofibers have excellent electrochemical performance, the oxygen reduction catalytic reaction in an alkaline environment is basically a 4-electron reaction, and the ORRreaction in the zinc-air battery is promoted.