229 results about "Silver coating" patented technology

The invention relates to the technical field of material detection, in particular to a silver coating adhesive force detection method based on multi-frequency impedance imaging, which comprises the following steps: applying a dual-mode multi-frequency excitation signal to the surface of a silver coating through an attached microelectrode array, synchronously acquiring voltage-current response data, and generating a dual-mode multi-frequency impedance original data set; performing time-varying impedance phase-locked separation on the dual-mode multi-frequency impedance original data set, extracting a dynamic impedance component of a coating-matrix interface region, and reconstructing a three-dimensional sub-interface impedance distribution diagram; and outputting an adhesive force quantized value through an oscillation frequency-adhesive force conversion model according to the spatial oscillation frequency characteristics of the impedance phase in the three-dimensional sub-interface impedance distribution diagram. According to the invention, a double-phase-locked loop system is adopted to realize the time-varying component demodulation of the impedance response of the silver coating-matrix interface, the low-frequency dynamic impedance signal modulated by silver ion migration is effectively extracted, and the weak change of the interface bonding state is sensitively reflected.

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 belongs to the technical field of metal powder materials, and particularly relates to a preparation and surface modification method of silver-coated copper powder. Comprising the following steps that copper powder activated through a mixed acid solution and a dispersing agent are dissolved in ethyl alcohol, and copper powder turbid liquid is obtained; dropwise adding the silver complexing solution into the copper powder turbid liquid under the condition of water bath heating for reaction to obtain silver-coated copper powder turbid liquid; then, a reducing agent solution is dropwise added into the silver-coated copper powder turbid liquid, silver ions in the solution are further reduced, solid-liquid separation, washing and drying are conducted, and primary silver-coated copper powder is obtained; and finally, the silver-coated copper powder is subjected to surface modification, and the dispersity of the silver-coated copper powder is improved. The preparation method of the silver-coated copper powder provided by the invention is simple in process, and in the chemical oxidation reduction process, the prepared silver-coated copper powder is compact in silver coating, complete in coating, low in resistivity and good in oxidation resistance by regulating and controlling the concentration of silver ions and the complexing agent, the reaction temperature, the type of the dispersing agent, the dripping rate and the type of the surface modifier.

The invention discloses a coating and a method for recovering precious metals in a physical vapor deposition process. The coating mainly comprises a silver coating positioned on the lower layer and an organic silicon modified layer positioned on the surface of the silver coating. Before precious metal is recycled, the coating is prepared on the surface of the position where precious metal needs to be recycled in the physical vapor deposition process, after physical vapor deposition is completed, an adhesive tape is adopted to be pasted to the surface of the coating, and then the precious metal is stripped from the surface of the coating in a mode of tearing the adhesive tape; or scraping the surface of the coating by adopting a tool, so that the noble metal is stripped from the surface of the coating, and stripped noble metal chips are collected; and finally, the adhesive tape with the precious metal or the collected precious metal scraps are heated, and the precious metal is recycled from a heating product. According to the method, efficient stripping and efficient recycling of the precious metal can be achieved, the coating has no influence on physical vapor deposition equipment and the technological process, and the method is simple in technology, high in operability, environmentally friendly, free of pollution and high in economical efficiency when the precious metal is recycled and can be applied to the recycling process of the precious metal on a large scale.

The invention discloses high-oxidation-resistance flaky silver-coated copper particles and a preparation method thereof, and relates to the technical field of silver-coated copper powder. The process comprises the steps of flaky copper powder preparation, copper powder pretreatment, silver coating plating and post-treatment. The surface of the copper powder is pretreated, and active sites on the surface of the copper powder are reduced; secondly, a zinc phosphate plated film is formed, full coverage of a silver layer is achieved by adding nano-silver to assist in a silver ammonia solution, meanwhile, micropores of the silver layer are filled, and the compactness of the silver-coated copper powder is improved; besides, the silver content of the silver-coated copper powder is controlled to be 8.7-14.6%, and the normal-temperature oxidation resistance of the silver-coated copper powder is improved, so that the optimal anti-oxidation effect is achieved, and performance deterioration caused by oxidation is reduced.

The invention belongs to the technical field of metal surface treatment, and discloses a high-uniformity metal surface silver plating process and a corrosion-resistant treatment method thereof.The high-uniformity metal surface silver plating process comprises the following steps that firstly, pretreatment is conducted; step 2, activating treatment; step 3, pre-plating a bottom layer; step 4, electrosilvering; step 5, post-processing; according to the method, pre-plating of the bottom layer and electroplating of silver are combined, a layer of thin nickel or copper is pre-plated firstly, and then electroplating of silver is performed, so that the binding force and uniformity of the silver plating layer are effectively improved, and in the electroplating process, the mode of stirring and circulating the electroplating liquid is adopted, so that silver ions in the electroplating liquid are uniformly distributed, and the uniformity of the plating layer is improved; and a thin aluminum oxide protective film is deposited on the surface of the silver plating layer by adopting a chemical vapor deposition technology, so that the corrosion resistance of the silver plating layer is further improved.

The invention provides fine grid slurry and a preparation method thereof, a solar cell and a photovoltaic module. The fine grid slurry is prepared from the following components in parts by weight: 50 to 65 parts of silver powder, 15 to 25 parts of silver modified nickel-coated copper powder, 2 to 5 parts of alloy powder, 2 to 5 parts of glass powder, 0.5 to 2 parts of aluminum oxide, 10.5 to 17.5 parts of organic carrier and 0.5 to 1.8 parts of additive, the silver-modified nickel-coated copper powder comprises a copper inner core, a nickel coating layer and a silver coating layer, wherein the outer surface of the copper inner core is sequentially coated with the nickel coating layer and the silver coating layer from inside to outside. The alloy powder comprises Ni element, B element and Si element; the aluminum oxide is spherical nano aluminum oxide; the organic carrier comprises organic silicon modified acrylic resin and epoxy resin. According to the fine grid slurry, the raw material cost is remarkably reduced, the process compatibility is good, silk-screen printing can be better supported, and the photoelectric conversion efficiency of a photovoltaic module can be better improved.

The invention discloses ultra-large-particle-size silver-coated copper powder particles and a preparation process thereof, and relates to the technical field of electronic metal materials. The process comprises the steps of atomization preparation of copper powder particles, acid washing, alkali washing, silver coating plating, cleaning and drying and the like. According to the method, the copper powder particles are prepared through the atomization technology, the atomization pressure and the medium flow speed are accurately controlled to crush molten copper into liquid drops with the proper granularity, then the liquid drops are rapidly condensed into the copper powder particles, the particle size of the prepared copper powder particles is stabilized between 7.5 micrometers and 8 micrometers, the particle size is uniform, the yield is high, and the production rate is extremely high; in addition, the silver layer on the particle surface of the silver-coated copper powder prepared by the method is densely and uniformly covered, the average thickness is controlled below 100nm, and the particle performance is ensured on the basis of reducing the cost.

The invention relates to the technical field of composite metal materials, in particular to a silver-coated graphene copper composite material and a preparation method thereof, and aims at solving the problems that traditional silver-coated copper powder is high in silver consumption, copper is oxidized due to the fact that a silver layer is prone to being damaged, and conductivity is insufficient. The method comprises the steps that a graphene coating layer is formed on a copper powder substrate in situ through chemical vapor deposition, and graphene copper powder is obtained; performing etching treatment on the graphene copper powder to controllably expose part of the copper substrate so as to form anchoring points for silver ion deposition; carrying out reduction treatment on the etched graphene copper powder so as to ensure that an anchoring site has chemical activity; in a reductive liquid phase environment, enabling a chemical silver plating solution to react with the graphene copper powder subjected to reduction treatment, and guiding silver ion deposition by utilizing an anchoring point, so as to form a silver coating layer on the surface of the graphene coating layer; and separating and drying the reacted system to obtain the silver-coated graphene copper composite material. The material is better in oxidation resistance and conductivity, and the process is free of waste liquid.

The invention discloses a preparation method of high-oxidation-resistance silver-coated copper composite powder, which comprises the following steps: (1) pretreatment of copper powder: sequentially putting the copper powder into alkali liquor and acid liquor for pretreatment to obtain the pretreated copper powder; (2) preparation of copper powder suspension: dispersing the pretreated copper powder in a mixed solvent of water and alcohol, then adding a dispersing agent, a reducing agent and a surface tension additive, and adjusting the pH value to 9-11 to obtain the copper powder suspension; and (3) a coating reaction is conducted, specifically, the silver complex solution is dropwise added into the copper powder suspension obtained in the step (2) for the coating reaction, the reaction continues to be sufficient after dropwise adding is completed, the high-oxidation-resistance silver-coated copper composite powder is obtained, and the thickness of a silver coating layer is 150-200 nm. The prepared silver-coated copper composite powder has the advantages of being good in dispersity, uniform and compact in silver coating layer and high in oxidation resistance.

This invention relates to the field of photovoltaic technology and discloses a conductive silver-coated copper micropowder for photovoltaic applications and its preparation method. This preparation method aims to solve the problem of balancing performance and cost in existing silver-coated copper micropowders for photovoltaic applications. In this invention, during the pretreatment stage, the base copper powder is acid-washed but not water-washed. It undergoes pH adjustment, organic pre-bonding treatment, and gradient ammoniation to retain the activity of the copper powder and construct a uniform copper-ammonia complex layer. In the chemical silver plating stage, the pretreatment solution is added to a composite base liquid containing a complexing agent, organic amine, dispersant, and combined reducing agent. A silver-ammonia solution is then added dropwise under ultrasonic dispersion and nitrogen protection. In the post-treatment stage, the product undergoes ethanol reflux desorption, antioxidant treatment, vacuum drying, and low-temperature plasma activation, followed by sieving to obtain the final product. This method can achieve uniform and complete silver coating even with low silver content, providing a feasible path for the large-scale replacement of pure silver powder for photovoltaic applications with silver-coated copper micropowder.

The present application belongs to a kind of anti-tarnish sealant, for the technical problem that existing anti-tarnish agent can only extend the tarnish time, reduce the degree of tarnish, and the high temperature stability is poor, the silver-plated parts after treatment poor acid and salt fog ability, provide a kind of silver coating water-based anti-tarnish sealant, anti-tarnish film and its preparation method, anti-tarnish sealant includes yttrium zirconium composite sol, silane coupling agent, alkyl mercaptan, emulsifier, wetting agent, penetrant and water, it is proved to have the dual role of anti-tarnish and sealing silver coating hole, can significantly improve the anti-tarnish ability and acid and salt fog resistance of silver coating, and has very high high-temperature stability, can withstand 900 ℃ high-temperature baking.

The invention discloses a triboelectric nano-generator prepared by spraying MXene on stretchable polyurethane fibers, a preparation method and an application of the triboelectric nano-generator. The triboelectric nano-generator is integrally of a layered coaxial linear structure and comprises a stretchable layer, a conductive layer, a triboelectric layer and a two-dimensional material layer from inside to outside. The stretchable layer is a polyurethane (PU) layer; the conductive layer is formed by tightly winding a silver wire or a silver-coated nylon wire on the stretchable layer; the triboelectric layer is a polyamide (PA) layer and is used for generating a triboelectric effect; the two-dimensional material layer is used for improving the electrical output performance. According to the method, the production of the triboelectric nano generator FM-TENG with the stretchable polyurethane fiber sprayed with the MXene is realized through a two-step weaving process; the prepared triboelectric nano generator FM-TENG has excellent mechanical performance, stable electrical performance and high customizability, and can be widely applied to the fields of human motion recognition, energy collection, self-powered sensing and the like.

The present invention relates to the technical field of decorative films, and in particular to an antibacterial and mildew-proof high-flash glitter powder film material and a preparation method thereof, comprising the following steps: S1, taking a biaxially oriented PET film substrate, cleaning and dusting the surface, corona treating it, preheating it, vacuum evaporating a silver layer, cooling it, and removing it from the chamber to obtain a silver-plated PET film; S2, adding a terpolymer to deionized water, ultrasonically dispersing it, adding a water-based polyurethane binder, stirring it, adding glitter powder, and continuing to stir it to obtain a functional coating slurry; S3, evenly coating the functional coating slurry on the surface of the silver-plated PET film, drying it with hot air, curing the coating with UV light, heat-setting it in a nitrogen atmosphere, and winding it up to obtain the antibacterial and mildew-proof high-flash glitter powder film material prepared by the present invention has good optical properties and good antibacterial properties.

The utility model discloses vacuum coated glass which comprises a glass body, the upper end of the glass body is provided with a silver coating, the outer surface of the glass body is provided with a limiting frame, the upper end of the glass body is provided with a transparent protection plate, the transparent protection plate is made of a polycarbonate plate or an acrylic plate, and the side face of the limiting frame is provided with an inlet hole. A hidden groove is formed in the inner wall of the limiting frame, the hidden groove corresponds to the position of the entering hole, a push rod is arranged in the hidden groove, matching grooves are symmetrically formed in the inner wall of the limiting frame, and the matching grooves communicate with the hidden groove; a second spring is installed on the inner wall of the matching groove and fixedly connected with the push rod. The transparent protection plate is installed at the upper end of the glass body, the glass body is protected through the transparent protection plate, so that the silver coating on the surface of the glass body is prevented from being damaged by external force, and meanwhile, the transparent protection plate is convenient to replace, convenient and fast.

The invention discloses a preparation device and a preparation method for producing and processing highland barley flavor tofu in a plateau low-oxygen environment, and belongs to the technical field of tofu processing, the preparation device comprises a centrifugal drier main body, and the centrifugal drier main body is provided with a pump suction structure; the pumping structure comprises an electric pump mechanism and a filtering mechanism, the filtering mechanism comprises a filter shell unit, and a filter element assembly is arranged on the filter shell unit; the filter element assembly comprises a transparent top plate, and a blocking piece is arranged on the transparent top plate. In the filtering process of the filtering structure, bacteria in drained water can be killed through the nano-silver coatings loaded on the surfaces of the inner filtering plate and the first elastic membrane, the number of the bacteria in the drained water is effectively reduced, and after the centrifugal drying machine body is closed, the bacteria surviving on the inner filtering plate are killed through the nano-silver coatings, so that the bacteria in the drained water are effectively reduced. Blockage of filter holes of the inner filter plate caused by breeding of bacteria on the inner filter plate is effectively avoided, meanwhile, the number of microorganisms such as bacteria in discharged wastewater can be effectively reduced, and ecological protection of plateau regions is facilitated.

The invention relates to the technical field of decorative films, in particular to an antibacterial mildew-proof high-flash glitter powder film material and a preparation method thereof.The preparation method comprises the following steps that S1, a two-way stretching PET film base material is taken, subjected to surface cleaning and dust removal, corona treatment and preheating, then subjected to vacuum evaporation to form a silver layer, cooled and taken out of a cabin, and a silver-plated PET film is obtained; s2, adding a terpolymer into deionized water, carrying out ultrasonic dispersion, adding a waterborne polyurethane binder, stirring, adding glitter powder, and continuously stirring to obtain functional coating slurry; and S3, uniformly coating the surface of the silver-plated PET film with the functional coating slurry, drying with hot air, irradiating and curing the coating by using a UV lamp, and carrying out heat setting treatment and rolling in a nitrogen atmosphere to obtain the silver-plated PET film. The antibacterial mildew-proof high-flash glitter powder membrane material prepared by the preparation method disclosed by the invention has good optical performance and also has good antibacterial performance.

The application relates to the field of four-silver coated glass, and particularly discloses a colorless four-silver LOW-E glass, which comprises a glass substrate and a composite film layer deposited on the surface of the glass substrate; the composite film layer is a four-layer silver coating structure formed by compounding SiNx, AZO, NiCr, Ag, ZnAlOx and ZnSnOx in a predetermined order; the thickness of each film layer is accurately controlled; the glass obtained has the following parameters: the glass surface color parameters are Rg=5.7, a*=-0.8 and b*=0.8; the film surface color parameters are Rf=3.9, a*=-1.4 and b*=-0.7; the visible light transmittance T is 67.5%; and the transmittance color parameters are a*=-4.5 and b*=-4.5. The glass surface and the film surface are both colorless, the glass has high light transmittance, and the colorless appearance and the optical transmittance performance are both considered.

This application provides a conductive polyimide film and its preparation method, belonging to the field of conductive materials. The method involves preparing a polyamic acid solution, mixing surface-coated rod-shaped silver powder with the polyamic acid solution, and then performing a casting process followed by gradient heating to obtain a polyamic acid film enriched with rod-shaped silver powder at the bottom. The rod-shaped silver powder-rich surface of the obtained polyamic acid film is then subjected to an ion exchange reaction with a silver nitrate solution. The ion-exchange film is then cleaned and subjected to thermal imidization treatment to obtain the conductive polyimide film. This application utilizes the ion exchange reaction and subsequent thermal curing process to reduce silver ions on the film surface, forming a silver-plated layer with excellent adhesion and conductivity. This material exhibits excellent reliability during use; even if the surface silver-plated film partially peels off due to wear, the conductive network built by the rod-shaped silver powder at the bottom can still serve as a backup conductive path, significantly improving its long-term stability in practical applications.

The invention discloses a preparation method of silver-coated copper slurry suitable for TOPCON, and relates to the technical field of battery preparation, and the preparation method comprises the following steps: preparing silver-coated copper particles; silver-coated copper particles are mixed with a glass system, an organic system and nanoscale silver particles according to the mass ratio to prepare silver-coated copper slurry; the silver-coated copper particles sequentially comprise a copper core, an aluminum oxide protection layer, a nickel layer and a nano-silver coating layer from inside to outside, and the silver-coated copper slurry is formed by mixing the silver-coated copper particles, a glass system, an organic system and nano-scale silver particles according to a mass ratio. The glass system is composed of bismuth oxide-boric oxide composite glass, zinc oxide-silicon oxide composite glass and tellurium oxide glass. According to the invention, the silver-coated copper particles with a multi-layer coating structure are used as a main conductive phase and are combined with the nano-silver particles, so that the conductive performance is ensured, the raw material cost of the paste is reduced, the cost pressure is dealt with, the problems of copper core oxidation and ion migration are solved, and the paste can be kept stable in a high-temperature and high-humidity environment.

A special tool for replacing a contact finger of a 110kV open-type disconnecting switch comprises a bottom plate, a first movable clamping block, a second movable clamping block and a driving rod, two fixing plates are oppositely arranged on the upper surface of the bottom plate, and a guide rod is arranged between the two fixing plates; the first movable clamping block and the second movable clamping block are oppositely arranged between the two fixing plates, and the first movable clamping block and the second movable clamping block are arranged on the guide rod in a sliding mode; the driving rod is rotationally arranged on the two fixing plates, and the driving rod can drive the first movable clamping block and the second movable clamping block to synchronously get close to the middle of the driving rod or be separated from the two ends of the driving rod. When the contact finger replacement device is used, the contact finger silver coating is prevented from being damaged in the replacement process, the refinement degree of maintenance work is improved, meanwhile, the situation that the contact finger and the spring bounce and hurt workers is avoided, and the safety of the maintenance work is improved. Therefore, the number of participants in contact finger replacement work is effectively reduced, the labor cost is saved, the working time of contact finger replacement is effectively shortened, and the working efficiency is improved.

The invention relates to the technical field of electric contact material preparation, in particular to a single-face decarburized silver graphite strip and a manufacturing method thereof.The manufacturing method includes the steps that silver powder and graphite powder are evenly mixed and pressed into a silver graphite spindle through isostatic pressing, and the silver graphite strip is formed through hot extrusion; and then the two silver graphite strips are compounded through hot rolling to form a silver graphite double-layer composite strip, the silver graphite double-layer composite strip is subjected to decarburization treatment, and then the silver graphite double-layer composite strip is separated into two single-face decarburized silver graphite strips after being subjected to cold rolling treatment. The silver graphite strip with the single face coated with the silver layer is produced through the manufacturing method, the process is simple and feasible, the material utilization rate is high, and the manufacturing method is suitable for batch production.

The present invention discloses a novel composite multi-layer breathable gauze material with both waterproof and anti-infection functions and a preparation method thereof. The specific preparation steps are: 1) the gauze is immersed in a graphene oxide solution, then rinsed and dried; a first layer of strengthening layer structure is formed on the surface of the gauze; 2) the gauze forming the first layer of strengthening layer structure is immersed in a stearic acid / organic silicon emulsion / vegetable oil mixed solution for hydrophobic modification to form a second layer of waterproof layer structure; 3) cold gas dynamic spraying is performed on the surface of the gauze to deposit nano silver particles to form a third layer of antibacterial layer structure; 4) it is light-proof packaged and irradiated and sterilized to obtain a novel composite multi-layer breathable gauze material with both waterproof and anti-infection functions, and the side with the silver coating is in direct contact with the wound during use. The gauze material of the present invention can achieve efficient prevention and treatment of wound infection, and the hydrophobic coating can effectively block external water and ensure breathability, which has important clinical significance for wound treatment.

The invention provides a non-pressure nano-silver sintering method for welding a SiC power device, and relates to the technical field of semiconductor chips. Comprising the steps that a molybdenum plate substrate and a power chip are cleaned, the thickness of the molybdenum plate substrate is 1 mm, and the power chip is of a junction barrier Schottky diode structure; preparing a silver coating on the cleaned molybdenum sheet substrate; the nano-silver soldering paste is stirred; the silver plating layer is coated with nano-silver soldering paste, and the thickness of the coated nano-silver soldering paste is 50 microns; mounting a power chip on the coated nano-silver soldering paste; the surface-mounted power chip is sintered and cooled in sequence, two times of heat preservation operation are adopted in the sintering process, formic acid mixed gas and nitrogen mixed gas are adopted as the sintering atmosphere, the temperature of the first time of heat preservation operation is 140 DEG C, the duration of the first time of heat preservation operation is 1 h, the temperature of the second time of heat preservation operation is 220 DEG C, and the duration of the second time of heat preservation operation is 2 h. Therefore, when the SiC power semiconductor chip needs to continuously work at the high temperature of 250 DEG C, the performance reliability can be ensured.

The invention relates to the technical field of automobile part production, and particularly discloses an intelligent active anti-fog automobile lamp system based on a nano-silver composite coating, which comprises a lamp shell, a mask, a lamp panel, an infrared LED lamp, an intelligent control unit, a temperature and humidity sensor, a nano-silver coating and a surface-mounted NTC thermistor sensor, the invention further discloses a manufacturing method of the intelligent active anti-fog vehicle lamp system based on the nano-silver composite coating, and the intelligent active anti-fog vehicle lamp system based on the nano-silver composite coating comprises three functional modules, namely a photo-thermal conversion nano-silver coating material, a light source excitation module, an infrared LED lamp and an intelligent control unit. According to the core principle, nanometer photonics, thermodynamics and an automatic control technology are deeply fused, three functional modules including a nanometer silver photothermal conversion coating material, a light source excitation module, an infrared LED lamp and an intelligent control unit are integrated inside, the manufacturing process is reasonable, the function is safe and reliable, intelligent active anti-fog of the automobile lamp is achieved, manual intervention is not needed, and durability is achieved.

This invention discloses a titanium-aluminum metal rotating target and its preparation method, belonging to the field of target material technology. The preparation method includes the following steps: preparing a pure silver coating on the surface of a stainless steel backing tube using conventional cold spraying; depositing a titanium-aluminum deposition layer on the pure silver coating surface using vacuum cold spraying, and simultaneously subjecting the deposition layer to laser shock peening using a laser shock intensification process; repeating the above steps until the total thickness of the titanium-aluminum deposition layer reaches a preset thickness. This method is simple to operate, has high material utilization, and is not limited by target size, enabling the preparation of large rotating targets. The prepared target has high density, small grains, uniform structure, low gas content, and high bonding strength with the backing tube. The pure silver coating further enhances the conductivity and sputtering uniformity of the target.

A silver-coated resin particle (10) includes a resin particle (11) made of a resin composition and a silver coating layer (12) formed on the surface of the resin particle (11), characterized in that the silver-coated resin particle (10) contains silicon oxide in a range of 0.04 mass% or more and 3.00 mass% or less, and the content of tin is 0.20 mass% or less. The 5% compression elastic modulus (5% K value) is preferably 2.5 GPa or less. The resin composition is preferably one or two or more selected from the group consisting of an acrylic resin, a styrene resin, a phenol resin, a polyurethane resin, and a polyimide resin.

Disclosed in the present invention are a radar-transparent high-luminance silver coating, and a preparation method therefor and the use thereof. The high-luminance silver coating comprises: at least one aluminum pigment, with the weight percentage thereof being less than or equal to 1.5%; at least one silver pearlescent pigment, with the weight percentage thereof being 0.5-4.0%; and a solvent-type base material having a high content of an orienting agent, wherein the weight percentage of the effective content of the orienting agent in the solvent type base material is greater than 5%. In the present invention, a low addition amount of the aluminum pigment is used in combination with the silver pearlescent pigment having high covering properties to prepare the radar-transparent high-luminance silver coating in a base material system having a high content of the orienting agent; an increment in radar transmission loss caused by the silver coating is less than 0.5 dB, the optimal L15° is greater than 140, and the silver coating can also have good angle-dependent color shifting performance, flickering properties and covering power, and obvious metallic appearance; and the silver coating is expected to be applied to usage scenarios having requirements for both silver appearance and radar signal transparency.

The invention belongs to the technical field of heat insulation films, and particularly relates to a heat insulation film and production equipment thereof.The heat insulation film sequentially comprises a protective layer, a silver plating layer, a PET layer, a functional layer, a bonding layer and a release film from outside to inside, the protective layer is made of polyurethane, and the silver plating layer is formed by sputtering a metal material on a PET base film through magnetron sputtering equipment; the functional layer adopts a coating machine to coat the surface of the PET base film of the silver plating layer with coating liquid containing functional auxiliaries, the functional auxiliaries comprise an anti-UV absorbent, an infrared reflecting agent and an infrared absorbent, the bonding layer is a polyurethane adhesive, and the release film is a PET release film; pET is used as a base film, so that the heat insulation film has good light transmission performance, the functional layer acts on ultraviolet rays and infrared rays in a targeted mode, absorption and reflection of visible light are small, and solar heat and ultraviolet rays are effectively reflected and absorbed in combination with the silver plating layer; therefore, the heat insulation film has high visible light transmittance, ultraviolet blocking effect and weather resistance, and also has good heat dissipation effect.

The invention discloses composite silver powder and a preparation method thereof. Relates to the field of silver powder preparation. The preparation method of the composite silver powder comprises the following steps: S1, carrying out surface hydroxylation treatment on copper powder to form a surface modification layer; s2, in the presence of a dispersing agent, a silver coating layer is deposited on the surface modification layer through multi-stage reduction reaction sequentially using a weak reducing agent and a strong reducing agent, and composite powder is obtained; and S3, carrying out surface anti-oxidation treatment on the composite powder by using a coordination agent to form a surface protection film. According to the composite silver powder prepared through the method, the interface bonding force is improved, and the problem that a traditional core-shell structure is prone to stripping is solved; through a multi-stage reduction process and a seed crystal induction-oriented growth mechanism, the requirement of precision electronic paste printing on particle size uniformity is met; the flexibility is improved, and the reduction of the conductivity caused by the cracking of the silver layer is avoided.