1164 results about "Silver Nano" patented technology

The invention relates to the field of building materials, and discloses a multifunctional foamed ceramic sound insulation and heat preservation material for buildings. Comprising the following raw materials in parts by weight: 42 to 48 parts of pottery clay tailings, 14 to 16 parts of fly ash, 10.5 to 12 parts of crushed stone materials, 2.8 to 3.2 parts of a silicon carbide foaming agent, 0.7 to 0.8 part of a borax fluxing agent, 7 to 8 parts of paraffin / silicon dioxide phase change microcapsules, 0.5 to 1.0 part of graphene, 2.0 to 2.5 parts of nano iron powder, 0.05 to 0.5 part of nano silver, 1.0 to 1.5 parts of photocatalytic titanium dioxide and 0.3 to 0.4 part of a fluorosilane coupling agent. A stable matrix structure is constructed through the argil tailings, the fly ash and the crushed stone materials, the silicon carbide foaming agent and the borax fluxing agent reduce the heat conductivity coefficient, the sound insulation performance is improved, the material is endowed with the antibacterial ability through nano-silver and photocatalytic titanium dioxide, indoor sanitation is guaranteed, and a super-hydrophobic layer is constructed through the fluorosilane coupling agent.

The invention discloses a low-temperature silver-coated copper conductive silver paste suitable for heterojunction solar cell nickel screen printing, which comprises the following components in percentage by mass: 10-70% of spherical silver-coated copper powder, 15-80% of submicron silver powder, 0.5-5% of nano silver powder, 1-6% of resin, 0.2-4% of assistant and 0.5-3% of solvent, wherein the resin comprises epoxy resin with the epoxy equivalent of 200 to 260 and rubber toughened epoxy resin with the weight-average molecular weight of 10000 to 20000. Wherein the epoxy resin with the epoxy equivalent of 200-260 provides ink passing performance, and nickel net narrow line width printing is guaranteed; the high-molecular-weight resin with the weight-average molecular weight of 10000-20000 is used as the thixotropic agent, so that the printing line type and the height-width ratio are ensured. The line width of a heterojunction battery prepared by matching the slurry with nickel net narrow line width printing can be as low as 18 microns, and the conversion efficiency of a battery piece is improved on the basis of greatly reducing the silver consumption of a single piece.

The invention discloses a gynecological antibacterial gel containing a carbomer component, and belongs to the technical field of gynecological nursing materials. The gel is prepared from 0.5 to 5 percent of plant extract microcapsules, 0.5 to 3 percent of carbomer, 2 to 10 percent of glycerol, 0.1 to 1.5 percent of triethanol and the balance of purified water. The plant extract microcapsule is prepared by compounding methacrylated silk fibroin and a caffeic acid hyaluronic acid graft, has temperature responsiveness, can improve the adhesive force on the surface of vaginal mucosa, and realizes slow release of the plant extract; the caffeic acid catechol hydroxyl is chelated with silver ions, a nano-silver monodisperse layer is formed on the surface of the microcapsule, and the antibacterial activity is improved. The composite plant extract can inhibit bacteria, repair mucous membranes and maintain the acidic microenvironment of the vagina. When the gel is prepared, the problem that the swelling efficiency of carbomer is low is solved through glycerol pre-grinding, and triethanolamine is added in three times to form a gradient cross-linked network. The problems that traditional gel is unstable in viscosity, poor in mucous membrane adhesiveness and prone to damaging vagina micro-ecology are solved, the antibacterial effect is good, and preservation is stable.

The invention relates to the technical field of nano silver powder preparation, in particular to a preparation method of high-tap-density and high-purity silver powder. The problems that in the prior art, silver powder is insufficient in purity and low in tap density are solved. The method comprises the following steps: preparing silver nitrate into a solution, carrying out electrolytic pretreatment, and carrying out chemical reduction, coprecipitation and dissolution reduction to obtain a silver powder suspension; the silver powder suspension is subjected to physical vapor deposition, silver vapor is deposited on the surface of the silver powder under the action of argon, and silver powder particles are tightly arranged; preparing an electrolyte from silver nitrate and bismuth nitrate, and carrying out electrolytic refining; and finally, the high-tap-density high-purity silver powder is obtained through ultrasonic dispersion and supercritical fluid drying treatment. By strictly controlling the process sequence and parameters and utilizing the synergistic effect among the processes, impurities are effectively removed, the particle size distribution of nano silver powder particles is optimized, the purity and tap density of the nano silver powder are improved, and the application of the silver powder in conductive materials is optimized.

The invention relates to the field of chip mounters, and discloses a nano-silver pre-sintering chip mounter which comprises a rack, a base material conveying device, a chip mounting head device, a heating sintering chip mounting platform, a crystal ring feeding device and a TRAY disc feeding device, the chip mounting head device is erected on the rack, the base material conveying device is arranged on the lower side of the chip mounting head device, the heating sintering chip mounting platform is arranged on the lower side of the chip mounting head device, and the TRAY disc feeding device is arranged on the lower side of the chip mounting head device. The heating platform is arranged in front of the base material conveying device; the wafer ring feeding device is arranged on the right side of the front end of the machine frame, the TRAY disc feeding device is arranged on the left side of the front end of the machine frame, components can be accurately mounted on a circuit board or other carriers, the mounting requirements of most of products in the market are met, the structure is more compact, the mounting efficiency is higher, and the mounting precision is higher.

The invention discloses a preparation method and application of a zinc-bromine flow battery positive electrode material, and belongs to the field of zinc-bromine flow batteries. The preparation method comprises the following steps: dissolving aniline and a dithio compound in an acidic ice bath, dropwise adding a peroxy strong oxidant to generate a polyaniline-disulfide bond copolymer, dialyzing, and freeze-drying to obtain powder; then heating soluble silver salt, a reducing agent, a hydrophilic dispersing agent and an organic sulfydryl silane coupling agent to prepare functionalized nano-silver particles; the powder and nano-silver particles are dispersed in N-methyl pyrrolidone for ultrasonic treatment, and dynamic self-repairing coating slurry is prepared; and performing acid pretreatment on the carbon fiber paper, and performing electrochemical deposition on the slurry to prepare the zinc-bromine battery positive electrode material. According to the zinc-bromine battery positive electrode material, the coulombic efficiency and the voltage efficiency of a zinc-bromine flow battery are remarkably improved and the cycle life of the zinc-bromine flow battery is remarkably prolonged through methods of dynamic covalent bonds, nano-silver catalysis, a hierarchical pore structure, carbon fiber pretreatment and the like, and the zinc-bromine flow battery positive electrode material has chemical stability, efficient bromine adsorption capacity and excellent catalytic activity.

The invention belongs to the technical field of aqueous zinc ion batteries, and discloses a preparation method and application of an aqueous zinc ion battery negative electrode coating material. The composite material is a silver-loaded carbon nitride composite material, and the composite material is used as a water-based zinc ion battery negative electrode artificial interface layer. A silver-loaded carbon nitride composite nano material is used as a zinc negative electrode interface coating. Silver nano ions can effectively improve electrostatic shielding on the surface of the zinc negative electrode, zinc ions are easier to deposit, and growth of zinc dendrites is inhibited; the material has excellent mechanical strength and chemical stability, so that the corrosion of electrolyte to the negative electrode is effectively inhibited; the protective layer is simple in preparation process, the prepared coating is high in adhesive force, a stable interface layer is easy to form, the half-cell cycle efficiency stability is obviously improved, the half-cell can stably circulate for 1323 circles, and the service life of the water-based zinc ion battery is prolonged.

The invention discloses a stainless steel material for a food-grade straw and a preparation process of the stainless steel material, and relates to the technical field of stainless steel material plating. The silver coating and the antibacterial coating are arranged on the surface of the stainless steel material, and the stainless steel material has good wear resistance and antibacterial performance through the action of the double protective layers. Sulfonated polyphenylene sulfide is added into a silver plating solution, a plating layer is formed after electroplating, the surface of a stainless steel material is not prone to being scratched, the wear resistance of stainless steel is improved, quaternary ammonium salt modified tea polyphenol-nano-silver composite particles are added into the antibacterial coating, and through the synergistic antibacterial effect of quaternary ammonium salt, tea polyphenol and nano-silver, the wear resistance of the stainless steel material is improved. The broad-spectrum antibacterial property is realized, and the efficient antibacterial effect is achieved.

The invention discloses silencing and mildew-proof organic silica gel as well as a preparation method and application thereof, and belongs to the technical field of organic silicon binding material polymers. Comprising the following components in parts by weight: 35-45 parts of nano calcium carbonate, 32-40 parts of hydroxyl-terminated polysiloxane, 5-9 parts of silencing powder, 0.5-2.5 parts of glass fiber powder, 5-9 parts of a hyperbranched polymer, 2-5 parts of a hydrophobic surface modifier, 1.5-3 parts of color paste, 1-2 parts of a water-based coupling agent, 1-2 parts of a cross-linking agent, 0.5-2.5 parts of a mildew preventive, 0.4-2 parts of a composite titanide and 0.4-0.7 part of nano silver powder. According to the invention, the nano silver powder and the mildew preventive are compounded, and an inorganic sterilization system is combined, so that broad-spectrum environment-friendly bacteriostasis is realized, and high-humidity long-acting protection is met; the powder is subjected to hydrophobic treatment, moisture is blocked, and high adhesion is kept; silencing powder serves as a core, a sound absorption network is cooperatively formed, the noise reduction capacity is improved, and the device is suitable for multiple scenes.

The invention belongs to the field of flexible electronic devices, and discloses a preparation method of a high-performance strain sensor based on a nano-silver nano-cellulose seepage network. According to the hydrogel, polyvinyl alcohol is used as a matrix, a seepage network formed by polydopamine anchored nano-silver / nano-cellulose PCNF is used as a conductive phase, glycerin is used as an anti-freezing humectant, and through the synergistic effect of a three-dimensional seepage conductive network and a dynamic hydrogen bond network, the defects that traditional hydrogel is poor in sensing stability, poor in environmental stability and low in mechanical strength are overcome. The preparation process is simple, the conductive hydrogel is high in tensile strength, high in sensitivity and good in cycling stability and has an antibacterial function, and an assembled strain sensor can monitor a human motion signal in real time and is suitable for the fields of wearable equipment, electronic skin and medical monitoring in an extreme environment. Through material system and process innovation, integration of high performance and multiple functions is achieved, and wide application prospects are achieved.

The invention relates to the technical field of biological materials, in particular to silver nano-chlorogenic acid composite hydrogel as well as preparation and application thereof. According to the invention, the CGA and the silver nitrate are used for green synthesis of the nano-particles CGA-AgNPs, and the nano-particles have peroxide nano-enzyme activity and antibacterial activity; and the CGA-AgNPs and chitosan (CS) are cross-linked to form the silver nano-chlorogenic acid composite hydrogel CGA-AgNPs-CS, so that the uniform distribution of nano-particles in the hydrogel can be promoted. According to the invention, multi-functionalization is taken as a target, a novel hydrogel composition system is designed from the source, the provided preparation method is green, simple, rapid and environment-friendly, the obtained composite hydrogel has multiple functions, and a good foundation is laid for expansion and application of the composite hydrogel in the biomedical fields of wound repair, wearable equipment, nano antibacterial drugs and the like.

The invention relates to the technical field of biomedicine, and discloses a triclosan antibacterial coating surgical suture and a preparation method thereof.The suture comprises a base material and a surface antibacterial coating, the base material is selected from one of an absorbable single-strand material, an absorbable multi-strand material, a non-absorbable single-strand material and a non-absorbable multi-strand material, and the surface antibacterial coating is selected from one of an absorbable multi-strand material and a non-absorbable multi-strand material; the antibacterial coating comprises triclosan, a high-molecular carrier and an auxiliary agent, the surface energy of a hydrophobic material is improved, the porosity of a hydrophilic material is increased, the adhesive force between the coating and different base materials is ensured, the base materials can be covered, the uniformity deviation of the coating is avoided, and the coating is free of cracking or falling off through the combination of plasma cleaning and roughening treatment on the surface of the base materials. A synergistic system is formed by triclosan, nano-silver and titanium dioxide, a dual mechanism of targeted destruction of bacterial cell membranes and free radical oxidation is achieved, the antibacterial rate is increased, the MRSA inhibition rate is increased, the degradation rate is regulated and controlled through the polylactic acid-glycolic acid copolymer carrier molecular weight and the lactic acid / glycolic acid proportion, and a curing dynamic formula is combined.

The invention relates to a carbon dioxide electrocatalytic reduction catalyst, in particular to an L-cysteine modified nano-silver electrocatalyst and application thereof, and belongs to the technical field of carbon dioxide emission reduction and resource utilization and electrocatalytic material synthesis. A preparation method of the L-cysteine modified nano-silver electrocatalyst comprises the following steps: S1, dissolving silver nitrate in water to obtain a 0.05-100mM silver nitrate solution, adding the silver nitrate solution into ethylene glycol, and uniformly stirring; the volume ratio of the silver nitrate solution to the ethylene glycol is 1: (2-20); s2, L-cysteine is added into the mixed solution, microwave heating is performed after uniform stirring, obtained solids are centrifugally washed at least three times with ethyl alcohol and ultrapure water respectively, and the solids are dried in a vacuum drying box to obtain nano-silver particles; the molar ratio of the silver element to the L-cysteine is 1: (0.01-10). By improving the adsorption capacity of the electrocatalyst on active substances, high selectivity and high stability of the product CO in a CO2 in-situ conversion system are realized.

The invention discloses a SiC power module sintering packaging method, and relates to the technical field of power module packaging, and the method comprises the steps: sequentially carrying out the ultrasonic cleaning, plasma activation and drying of a SiC chip and a ceramic substrate, and obtaining an activated ceramic substrate and a SiC chip; the surfaces of the activated ceramic substrate and the SiC chip are spin-coated with nano-silver paste, and a nano-porous silver layer is formed through pre-curing and low-temperature sintering; aligning the graphene / nano-porous silver composite layer chip with the ceramic substrate, performing segmented pressure sintering in a vacuum sintering furnace, and outputting a SiC power module; the SiC power module is subjected to epoxy resin packaging glue coating, ultraviolet light curing and annealing treatment, internal stress is eliminated, and the corrosion resistance is enhanced; and screening a SiC power module, performing XRD and SEM detection, coating a high-temperature-resistant silica gel sealing layer, performing curing, and outputting a finished product. Through the epoxy resin packaging adhesive coating and thermal-acoustic combined annealing technology, the residual stress of the packaging interface is released, the service life of the SiC power module is prolonged, and the adaptability of the SiC power module is improved.

The invention discloses porous cyclodextrin microspheres loaded with nano-silver as well as a preparation method and application of the porous cyclodextrin microspheres. The porous cyclodextrin microspheres are obtained by loading nano-silver on oligomeric cyclodextrin with the molecular weight of 8000-14000, then blending the oligomeric cyclodextrin with poly (methyl vinyl ether-alt-maleic acid) to obtain microspheres and then cross-linking the microspheres. The porous cyclodextrin microspheres are selected as the carrier of AgNP, and cyclodextrin has a hydrophobic cavity, so that specific hydrophobic molecules and pollutants can be included in the cavity, and contact and catalysis processes of reactants and silver particles are promoted synergistically. Moreover, the cyclodextrin microspheres have micron-scale and even millimeter-scale porous structures, the abundant porous structures can ensure that reactants quickly enter the microspheres to be in full contact with silver, the catalytic reaction is efficiently carried out, and meanwhile, the larger size of the microspheres ensures that fluid can pass through the microspheres at a high speed in a fixed bed reactor, so that the catalytic efficiency is improved. And the contradiction between the catalyst efficiency and the large particle size in practical application is solved.

The invention discloses self-cleaning antibacterial domestic ceramic and glaze and a preparation process thereof. The preparation process comprises the following steps: step 1, early-stage research and innovative conception; 2, determining a core raw material and a formula; step 3, pretreating the raw materials; step 4, glaze preparation process; step 5, preparing a domestic ceramic green body; step 6, glazing and sintering process; the preparation method has the advantages that nano titanium dioxide added in the glaze can generate free radicals with strong oxidizing property under illumination, organic pollutants on the surface of ceramic can be decomposed, the self-cleaning function is achieved, meanwhile, nano silver and silver-loaded zirconium phosphate have good antibacterial performance, breeding of various bacteria can be effectively inhibited, the anti-bacterial performance is good, the service life of the glaze is prolonged, and the service life of the glaze is prolonged. The antibacterial rate on common bacteria such as escherichia coli and staphylococcus aureus can reach 95% or above, the raw materials are wide in source and meet the environment-friendly requirement, the conventional ball milling, forming, glazing and firing processes are adopted, industrial production is easy, the cost is low, and large-scale popularization of the product is facilitated.

The invention discloses a high-performance conductive adhesive doped with conductive nanoparticles, and belongs to the technical field of conductive adhesives. The high-performance conductive adhesive provided by the invention is prepared from the following raw materials in parts by weight: 50 to 100 parts of vinyl liquid silicone rubber, 100 to 400 parts of modified silver coated copper powder, 1 to 10 parts of nano silver powder I, 1 to 10 parts of epoxy silane modified prepolymer, 3 to 30 parts of hydrogen-containing silicone oil, 0.1 to 5 parts of platinum catalyst and 0.05 to 1 part of inhibitor. The silver-coated copper powder and the epoxy silane are modified, so that the conductivity and the binding power of the conductive adhesive are greatly improved, and the epoxy silane modified prepolymer can form strong covalent bond combination with the surface of an adhered object through a high-density epoxy group of the epoxy silane modified prepolymer; the nano-silver bulges on the surface of the modified silver coated copper powder increase the effective contact area and the number of contact points among the conductive filler particles, so that the conductive adhesive has the characteristics of high conductivity, low resistance, high adhesive strength and strong toughness.

The invention discloses an electric conduction and heat dissipation integrated cable and method. The cable comprises a plurality of wire sub-body structures which are connected in sequence; each wire sub-body structure comprises a high-power conductive section, an insulating heat dissipation section and a microgroove array, the high-power conductive section is a cylindrical pipe body made of heat-conducting and conductive materials, and one end of the high-power conductive section forms a bent section of a right-angle structure through a precise cold bending process; the insulating heat dissipation section is of a cylindrical pipe body structure made of a heat-conducting insulating ceramic material and is seamlessly integrated with the bending section; a microgroove array is etched on the inner wall of the tubular shell of each wire sub-body structure; a nano-silver plating layer is embedded in the microgroove array at the high-power conductive section, and a super-hydrophilic layer is configured in the microgroove array at the insulating heat dissipation section; the insulating phase-change material evaporates in the high-power conductive section and is guided to the insulating heat dissipation section through the bent section to be condensed, continuous capillary pumping force is formed through combination of capillary force and gravity, pump-free self-maintaining circulation is achieved, and the temperature control capacity of the high-power wire under the extreme current density is remarkably improved.

The invention discloses an antistatic modified polyamide fiber and a preparation method thereof, and relates to the field of fibers. When the antistatic modified polyamide fiber is prepared, nano-silver is loaded on halloysite powder nanotubes in situ to prepare pre-modified halloysite powder nanotubes; grafting 9H-carbazole-9-formaldehyde to chitosan, and uniformly mixing the chitosan with the pre-modified halloysite powder nanotube and silver nitrate to obtain a modified halloysite powder nanotube; the preparation method comprises the following steps: reacting diethyl (hydroxymethyl) phosphate with carbazole-N-formyl chloride to obtain a functional monomer; reacting hexamethylenediamine, adipic acid, pyromellitic dianhydride and a functional monomer to prepare a modified polyamide slice; uniformly mixing the modified polyamide slices, the modified halloysite powder nanotubes, carbazole and ferric trichloride, spinning, and grafting 4-aminomethyl-2, 2, 6, 6-tetramethylpiperidine to obtain the antistatic modified polyamide fiber. The antistatic modified polyamide fiber prepared by the invention has excellent antistatic property, antibacterial property, flame retardance and aging resistance.

The invention relates to the field of building materials, in particular to nano-silver solder paste with high welding strength and a preparation method of the nano-silver solder paste. The nano-silver tin paste with high welding strength comprises the following raw materials: nano-silver powder, nano-tin powder, composite resin, a dispersing agent, an activating agent, a film-forming agent, a thixotropic agent, silicon-titanium particles, a stabilizing agent and the like. According to the nano-silver solder paste with the high welding strength and the preparation method thereof, uniform dispersion of an internal system is achieved, the welding effect and the welding performance are further optimized, the oxidation resistance can be greatly improved, the probability that high surface energy of nano-silver is prone to being oxidized to generate silver oxide is greatly reduced, and the welding quality of the nano-silver solder paste is improved. The silver solder paste prepared by the method further balances the balance between the preparation process and the high strength of the silver solder paste, and has excellent stability and mechanical strength, thereby meeting the requirements of high-reliability packaging in the prior art, and having wide application potential.

The invention belongs to the field of preparation of nano composite materials, and mainly relates to a nano additive with a'core-shell 'structure as well as preparation and application of the nano additive. And the core-shell structure nano additive comprises three kinds of core part materials and a shell layer coating material. For example, the material of the core part comprises nano natural tourmaline powder, nano selenium and nano silver, and the material of the shell part is silicon dioxide. Wherein the three core part materials respectively have the effects of generating and releasing negative ions, releasing selenium elements and resisting bacteria. In the ceramic sintering process, the coating'shell 'layer protects the chemical composition and the phase structure of the'core' material from being damaged; and the material coated with the'shell 'layer can be diffused into the ceramic material in the ceramic sintering process, so that the selenium element and the antibacterial metal element of the'core' part are controllably released. The core-shell structure nano additive is added into the pottery clay, and the multifunctional health-care ceramic material is obtained by sintering under the condition of medium and high temperature, so that the aim of controlling the release of selenium, antibacterial agent silver and negative ions is fulfilled.

The invention relates to a preparation method of a damp-proof antibacterial medicine packaging composite material with multiple barrier functions, and belongs to the technical field of medicine packaging materials. Enabling the composite complexing nano-silver, polyethylene and zinc stearate to pass through a double-screw extruder to obtain nano-silver antibacterial master batches; adding the nano-silver antibacterial master batch, a mixture of linear polyethylene and an ethylene-vinyl alcohol copolymer, an antioxidant 1010 and silicon dioxide into a single-screw extruder to obtain a damp-proof antibacterial film layer; uniformly coating a polyurethane adhesive on the surface of the damp-proof and antibacterial film layer, compounding an aluminum foil and the film layer coated with the adhesive on a compounding machine, and curing to obtain an aluminum foil-damp-proof and antibacterial film layer; the surface of the aluminum foil-damp-proof antibacterial film layer is coated with a polyurethane adhesive, and then the aluminum foil-damp-proof antibacterial film layer is compounded with a biaxially oriented polypropylene film and cured. The packaging composite material prepared by the invention has excellent moisture resistance, antibacterial ability, barrier property and mechanical property.

The invention discloses an oral dispersion liquid composition capable of effectively inhibiting bacteria, and relates to the technical field of nano-emulsion / micro-capsule suspension liquid. Aiming at the problems of transient antibacterial effect, strong irritation and poor dispersibility of the traditional oral care product, the composition is prepared by adopting a nano-emulsion and micro-capsule technology. A bacteriostatic agent (such as nano-silver and thyme volatile oil) is wrapped in urea formaldehyde microcapsules through an interfacial polymerization method, and protection and controlled release of active ingredients are achieved. The nano-emulsion is prepared by compounding Span and Tween emulsifiers, so that high dispersity and permeability are ensured; tea polyphenol is added as an antioxidant, so that the stability is enhanced. The preparation method comprises the steps of nano-emulsion preparation, active ingredient microencapsulation, disperse system construction and sterilization filling, and the particle size D90 of a final product is smaller than or equal to 200 nm. The composition has a lasting antibacterial effect, good stability and safety, and is suitable for oral health maintenance.

The invention relates to the technical field of micro-nano particle preparation, and discloses particle size controllable micro-nano silver powder and a preparation method thereof.The preparation method comprises the steps that S1, micron-sized silver cores and nano-sized silver particles are prepared; s2, performing surface activation on the micron-sized silver core; s3, filling pore gaps of a porous template with the micron-sized silver cores; s4, spraying graphene dispersion liquid on the porous template, and forming graphene network coverage on the surface of each silver core; and S5, after the porous template is removed, nanoscale silver particles are deposited on the surface of the exposed silver core, and a silver shell structure wrapping the silver core and the graphene network is formed. Through gradient compounding of a micron silver core-graphene network-nano silver shell structure, the width difference between two sintering necks formed between the circuit board and connecting plate interfaces on the two sides during sintering is reduced by effectively utilizing the wettability of a nano silver shell and the stress dispersity of graphene, and meanwhile the excellent electrical conductivity and thermal conductivity of the material are utilized; and the sintering performance of the circuit board is optimized.

The invention discloses weldable low-temperature sintered silver paste which is prepared by mixing 65-90 parts of micro-nano silver powder, 10-20 parts of metal salt additive, 1-5 parts of polymer additive, 15-19 parts of organic solvent and 1-5 parts of organic additive, the micro-nano silver powder is obtained by mixing nano silver powder with the particle size of 10-50nm and micron silver powder with the particle size of 1-10mu m, and a preparation method comprises the following steps: step 1, preparing a first-stage polymer carrier; the preparation method comprises the following steps: 1, preparing a first-stage polymer carrier, 2, preparing a second-stage polymer carrier, 3, pretreating micro-nano silver powder, and 4, preparing conductive silver paste. Through micro-nano silver powder grading, nano-particles are filled in gaps of micro-particles, the stacking density is improved, the sheet resistance is reduced, an oxidation film is formed on the surface of the passivated micro-nano silver powder, the interface bonding strength can be effectively improved, the sintering activation energy of silver is reduced by the metal salt additive, and by combining the'etching-remelting 'effect of the oxidation film on the surface of the silver powder, the bonding strength of the surface of the silver powder is improved. The sintering temperature is effectively reduced.

The invention provides a high-dispersity polypropylene primary color master batch as well as a preparation method and application thereof, and relates to the technical field of polypropylene, the high-dispersity polypropylene primary color master batch comprises the following components in parts by weight: 1-20 parts of pigment, 55-74 parts of polypropylene, 1-3 parts of nano titanium dioxide, 1-3 parts of nano silver, 1-3 parts of tungsten trioxide and 2-5 parts of dispersing agent. 1-3 parts of a phosphate heat stabilizer and 0.5-2 parts of an antioxidant. Through the composite synergistic effect of nano titanium dioxide and nano silver and other nano materials, the uniform dispersion performance of the polypropylene color master batch in a base material is improved, pigment agglomeration is effectively prevented, and the color consistency of a final product is ensured; functional components such as tungsten trioxide and nano zirconium oxide are introduced, so that the heat resistance and the ultraviolet aging resistance of the polypropylene product are enhanced, and the polypropylene keeps stable color under long-term outdoor use conditions and is not easy to fade and degrade.

The invention discloses a preparation method of a high-barrier aluminum oxide composite film for food packaging, and relates to the technical field of food packaging materials. The high-barrier aluminum oxide composite film for food packaging comprises the following raw materials in parts by weight: a barrier layer: 60-90 parts of modified nano aluminum oxide and 20-30 parts of a silane coupling agent KH-560; the functional layer is prepared from the following components in parts by weight: 18 to 28 parts of nano silver, 16 to 22 parts of compound antioxidant and 4 to 10 parts of nano titanium dioxide; the heat sealing layer is prepared from 22 to 32 parts of modified polylactic acid, 2 to 6 parts of graphene quantum dots, 12 to 16 parts of methyl methacrylate-butadiene-styrene copolymer, 3 to 6 parts of dodecyl trimethyl ammonium chloride, 10 to 14 parts of resorcinol tetraphenyl diphosphate and 7 to 17 parts of stearic acid intercalation modified nano montmorillonite. The high-barrier aluminum oxide composite film for food packaging is prepared by modifying nano aluminum oxide and polylactic acid, the barrier ability to gas, water vapor and ultraviolet rays is greatly improved, and the high-barrier aluminum oxide composite film is oil-resistant and antistatic. The product is high in mechanical strength, high in processing adaptability, capable of adapting to complex scenes, environment-friendly and safe.

The invention belongs to the technical field of antibiosis, and discloses a photodynamic antibacterial modified polyester fiber and a preparation method thereof.The preparation method comprises the steps that 1, SIPM serves as a surfactant, water-soluble silver salt serves as a precursor, ascorbic acid serves as a reducing agent, and water-soluble nano-silver powder is prepared; (2) after PTA and EG are subjected to esterification reaction, EG, SIPM and water-soluble nano-silver powder are added for polymerization reaction, and the photoresponse active material is obtained; (3) preparing the nano-silver antibacterial master batch by taking ECDP as a base material of the nano-silver antibacterial master batch and a photoresponse active material as an additive; and (4) carrying out melt blending on the modified polyester, a water-soluble pore-foaming agent and the nano-silver antibacterial master batch to obtain a spinning melt, spinning the spinning melt, and washing with water to obtain the photodynamic antibacterial modified polyester fiber. The photodynamic antibacterial modified polyester fiber disclosed by the invention has excellent antibacterial and antiviral properties.

The application discloses a preparation method of a flexible super-hydrophobic anti-icing coating and relates to the technical field of super-hydrophobic materials.The preparation method comprises the following steps: preparing nano-silver loaded multi-layer graphene; mixing PVP solution and multi-layer graphene suspension uniformly, adding glucose, stirring uniformly, adding silver-ammonia solution to react when the suspension reaches a set temperature, centrifugally separating after the reaction is completed, obtaining the nano-silver loaded multi-layer graphene product, cleaning by using pure water or ethanol, and drying in an oven for standby; and preparing a flexible super-hydrophobic layer; smearing a mixture of PDMS and a PDMS curing agent on the surface of a glass sheet, uniformly spraying nano-loaded multi-layer graphene powder to the surface of the mixture of uncured PDMS and the PDMS curing agent by using an airbrush, and placing in an oven for curing to obtain the flexible super-hydrophobic anti-icing coating.The preparation method is simple and environment-friendly, can be used on a large scale, and can solve the problems of anti-icing and deicing on various surfaces.

The present application relates to the technical field of bacteriostatic impregnated paper preparation, and discloses a bacteriostatic impregnated paper and a preparation method thereof, wherein a melamine impregnated paper substrate is impregnated with an impregnating solution; a rate regulating coating is coated on the surface of the substrate, so that the release rate of the bacteriostatic component is regulated according to the change of environmental pH value; wherein the surface of the rate regulating coating is further coated with a nano-silver particle layer, and the components of the impregnating solution include the following raw materials in percentage by weight: tea tree oil 0.5-2%, cinnamaldehyde 1-3%, lemon essential oil 0.5-1%, ethanol 70-80% and water; the present application provides a multi-layer protection mechanism, which can not only effectively kill various bacteria and fungi, but also prolong the duration of the bacteriostatic effect; the presence of the nano-silver particle layer enhances the long-term bacteriostatic effect, and even after long-term use, the high-efficiency antibacterial performance can be maintained; the introduction of the pH-sensitive polymer coating enables the release rate of the bacteriostatic component to be automatically regulated according to the change of environmental pH value.