192 results about "Silver carbonate" patented technology

A conductive composition capable of producing a conductive paint with excellent flexibility and a high conductivity comparable to that of metallic silver, without using high temperatures as film forming conditions. The conductive composition includes a particulate silver compound and a binder, and optionally a reducing agent and a binder. Silver oxide, silver carbonate and silver acetate and the like are used as the particulate silver compound. Ethylene glycol, diethylene glycol, and ethylene glycol diacetate and the like are used as the reducing agent, and a fine powder of a thermosetting resin such as a polyvalent phenol compound, phenol resin, alkyd resin or polyester resin, or a thermoplastic resin such as a styrene resin or polyethylene terephthalate, with an average particle diameter from 20 nm to 5 μm is used as the binder. Furthermore, the average particle diameter of the particulate silver compound is preferably from 0.01 to 10 μm.

The invention discloses a preparation method of a silver-loaded mesoporous inorganic antibacterial agent. The preparation method comprises the following steps: dissolving a template agent, a titanium source and silver nitrate in water to obtain a silver sol solution; dropwise adding a carbonate aqueous solution to the silver sol solution and stirring and mixing the solutions to form titanium dioxide / silver carbonate gel; drying the gel and then carrying out thermal treatment, thus obtaining the mesoporous titanium dioxide inorganic antibacterial agent containing elemental silver. The prepared silver-loaded mesoporous inorganic antibacterial agent has specific surface area of 200-800cm<2> / g, aperture of 5-30nm and pore volume of 1.0-5.0cm<3> / g. The mass percent of the elemental silver is 26-30%. The antibacterial agent takes mesoporous titanium dioxide with good mould resistance as a carrier and the elemental silver is loaded in a titanium dioxide matrix, so that the broad-spectrum antibacterial effect of the antibacterial agent can be improved. The preparation method is simple, has the advantages of broad-spectrum antibacterial property, lasting antibacterial effect and stable antibacterial properties and can be widely used in the fields such as ceramics, plastics, textiles, coatings and water treatment.

The inorganic antiseptic consists of zinc oxide with semiconductor characteristic and Ag ion, where the Ag ion is in the mass fraction of 0.1-10 %, and the zinc oxide is one or several kinds of four-needle zinc oxide whisker, nanometer zinc oxide and common zinc oxide powder. The Ag ion is provided by one or several kinds of silver nitrate, silver carbonate, silver sulfate, silver chloride and sliver oxide, and is carried in the lattice of zinc oxide by means of high temperature solid solution technology. The inorganic antiseptic of the present invention has wide antiseptic spectrum, high efficiency, lasting antiseptic effect and high safety, and is suitable for food packing, building material, medical equipment, fabric, sanitary article and other fields.

A process for preparing rebaudioside M is disclosed. The process includes: a step of subjecting rebaudioside C (RC) that is adopted as a substrate and a chemical compound R1 to a substitution reaction under the action of silver carbonate to obtain an intermediate Ac-RM; and a step of performing hydrolysis to obtain the product rebaudioside M (RM). By the manner, the process has characteristics of low raw material cost, mild reaction conditions, convenient purification, simple operation, good product quality, high yield, no generation of toxic harmful compounds in the whole process, and good environment protection effects, and is suitable for industrial production.

The present invention discloses a method for preparing the nanometer-level silver powder, and comprises the steps such as the reduction reaction, the surface chemical treatment and the drying, wherein, the reduction reaction: (1) organic acid dispersing agent is added into the organic alcohol solution to be mixed, and then is added with silver-contained material and neovaricaine reducer to be uniformly mixed, and to obtain the suspension solution; (2) the suspension solution that is obtained in the mixing step (1) is heated to 80 to 100 DEG C; (3) within 2 to 4 hours, neovaricaine reducer is dropped into the suspension solution that is obtained in step (2), and is continued to be mixed for 0.5 to 1 hour, and is cooled to 50 DEG C plus or minus 5 DEG C, and is kept still to precipitate the silver powder; the silver-contained material is one or two mixtures of silver carbonate and silver oxide. The method of the present invention is simple and easy to be done; the produced nanometer silver powder has high purity, good dispersing property, and small grain large specific surface and wide drying temperature range; the powder can be effectively prevented from being self sintered or clustered, and is easy to be dispersed to be organic carrier.

The invention discloses a method for extracting precious metals such as gold, silver and the like from silver separating residues and relates to a method for recovering the precious metals such as gold, silver and the like from solid residues obtained after metals such as Se, Cu, Te, Au, Ag and the like are separated and extracted from copper anode slime. The method is characterized by comprising the following steps of: firstly adding sodium chloride into industrial inorganic acid to leach anode slime, directly adding copper powder into the filtrate to reduce the precious metals such as gold, silver and the like, adding a sodium carbonate solution into the filter residue to convert the slightly soluble silver in the filter residue into silver carbonate, adding a sodium sulfite solution to leach, and adding the copper powder into the obtained filtrate to reduce the precious metals such as silver and the like. The method disclosed by the invention is capable of comprehensively recovering and concentrating the precious metals such as gold, silver, platinum, palladium and the like from the anode slime and is high in gold and silver recovery rate and simple in equipment at the same time, so that the method is suitable for large-scale industrial production.

The invention provides a method for making a durable compound antibiosis nonwoven cloth material. By performing an efficient combination of insoluble silver particle pincer system which has a non dissoluble type high efficient antibiosis function with dissoluble type chlorine system quaternary ammonium salt, an antimicrobial solution with a certain concentration is made, by performing immersing and rolling finishing on the chemical fiber non woven cloth with the antimicrobial, a non woven cloth which combines active antibiosis and passive antibiosis functions is made, the non dissoluble silver pincer complex is a nanometer particle pincer complex of silver carbonate or silver bromide; the quaternary ammonium salt is a CTMAC or a double stearyl DHTDMAC, which has a good surface treating and antibiosis performance; as for the mixture ratio of the two, the former is 10 to 60 percent, the latter is 90 to 40 percent, and as for the optimal mixture ratio, the former is 25 percent and the latter is 75 percent. The after finishing is adding the assembled antimicrobial onto the molded non woven cloth coiled material by immersing and sprinkling, and baking and sizing the material, without any other surface pre-treating process.

A graphitic carbon nitride / silver carbonate / silver bromide ternary composite nano-material, a preparing method thereof and uses of the nano-material are disclosed. Rodlike Ag<2>CO3 and g-C3N4 having a lamellar structure grow together, and AgBr particles are attached to the surface of the Ag<2>CO3. The nano-material comprises 5-30 wt% of the g-C3N4 and 1-8 wt% of the AgBr, with the balance being the Ag<2>CO3. The preparing method includes (1) subjecting urea and melamine to high-temperature solid-phase sintering to obtain a g-C3N4 lamellar structure, (2) synthesizing the g-C3N4 nanosheet, a soluble silver salt and a carbonate or bicarbonate into g-C3N4 / Ag<2>CO3 particles through a solution precipitation reaction, and (3) introducing Br<-> to the g-C3N4 / Ag<2>CO3 particles. The prepared ternary composite nano-material is high in yield and can be adopted as a photocatalyst.

The invention discloses a preparation method of a flake silver graphite electrical contact material. Particularly, the method comprises the following steps: calculating required graphite powder and silver carbonate powder according to the material proportions for a to-be-prepared silver graphite electrical contact, and weighing the graphite powder and the silver carbonate powder for later use; mixing the silver carbonate powder with the graphite powder, and obtaining a silver graphite billet coated with a silver layer at the outer side of the billet from the obtained silver carbonate and graphite mixed powder through the procedures of molding, roasting, sintering and decarbonizing; and further processing the silver graphite billet into strips through hot extrusion, and carrying out rolling and stamping to obtain the flake silver graphite electrical contact. According to the method disclosed by the invention, direct contact of brittle phase graphite and silver particles can be effectively reduced; mechanical and physical properties and the processability of the prepared product are relatively excellent; and a metallographic structure is relatively uniform.

The invention relates to a preparation method for a visible-light-driven photocatalyst compositing bismuth oxychloride / silver carbonate. The preparation method comprises the following steps: preparing bismuth oxychloride; adding bismuth oxychloride into distilled water, performing ultrasonic stirring, adding silver nitrate, performing stirring, adding a sodium bicarbonate solution dropwise, performing stirring, performing centrifugation, washing the product by ethanol and water in turn, and drying the product. The preparation method is simple, and the preparation condition is easy to control. Moreover, the prepared visible-light-driven photocatalyst compositing bismuth oxychloride / silver carbonate is a green catalyst with high performance, is pollution-free, has high catalytic efficiency, and has a certain application value.

The invention relates to a photocatalyst, and in particular relates to a carbon nitride / silver carbonate composite visible light photocatalyst and a preparation method thereof, belonging to the technical field of composite materials and photocatalysis in environmental management. The composite photocatalyst is formed by compounding g-C3N4 and Ag2CO3 in the mass ratio of 1:99-10:90. The preparation method comprises the following steps: putting carbon nitride into deionized water for ultrasonically dispersing; adding silver nitrate and ultrasonically dispersing; adding ammonia water and sodium bicarbonate; regulating the pH by using a dilute nitric acid solution; stirring for reacting for a certain period of time; centrifugally separating, washing and drying a product to obtain the g-C3N4 / Ag2CO3 composite photocatalyst. Being proved by photocatalytic performance experiment research, the composite photocatalytic material has high photocatalytic activity. The composite photocatalyst is wide in visible light response range and high in photocatalytic activity, and has good application prospects and economic benefits on the aspects of sewage treatment, solar transformation and the like.

The invention discloses a silver carbonate / silver / tungsten trioxide ternary composite Z type photocatalyst and a preparation method and application thereof. Silver carbonate is used as a carrier of the Z type photocatalyst, tungsten trioxide is modified on the silver carbonate, and elemental silver is loaded on the tungsten trioxide. The preparation method comprises the following steps: mixing silver nitrate with tungsten trioxide dispersion liquid to prepare Ag<+>-WO3 dispersion liquid; and dropwise adding a sodium bicarbonate solution and carrying out light treatment. The Z type photocatalyst has the advantages of high photo-induced electron-cavity separating efficiency, high photocatalytic activity, high redox ability, good stability, corrosion resistance and the like. The preparation method has the advantages of simplicity and convenience, low costs of raw materials, low energy consumption, short consumed time, easily controlled conditions and the like, is suitable for continuous large-scale production, and facilitates industrialized utilization. The Z type photocatalyst can be used for degrading dye wastewater and antibiotic wastewater, has the advantages of stable photocatalytic performance, high corrosion resistance and high pollutant degradation efficiency, and is good in application prospect.

The invention discloses a synthesis method of beta, beta-diaryl alkene, which comprises the following steps that: in an organic acid solvent, in the presence of a palladium catalyst and a silver salt, a halogenated aromatic hydrocarbon and an end alkenyl compound are subjected to a coupling reaction to obtain the beta, beta-diaryl alkene, wherein the organic acid solvent is acetic acid, the palladium catalyst is palladium acetate, the silver salt is silver acetate, silver carbonate or silver oxide, the halogenated aromatic hydrocarbon is iodo aromatic hydrocarbon, and the coupling reaction is operated at a reaction temperature of 80 to 130 DEG C for 0.25 to 24 hours. With the method, the environmentally friendly organic acid is used as the solvent, and the silver salt is used as an additive; and the method has the advantages of small amount of catalyst, mild reaction conditions, simple post-treatment, and high yield of a product, without adding other ligands and the like.

The invention relates to an Ag2CO3-graphene oxide composite nano-material, a preparation method and an application thereof. In the Ag2CO3-graphene oxide composite nano-material, Ag2CO3 is a rod-like particle, graphene oxide is in the shape of a thin sheet and the mass percentage of the graphene oxide is 0.45% to 3.5%. The preparation method comprises the following steps of: ultrasonically dispersing the graphene oxide, adsorbing AgNO3 by the graphene oxide, adding in an aqueous solution of ammonia for reaction, adding in a NaHCO3 solution for reaction, separating the product by centrifugation, and washing and drying the separated product. The composite nano-material takes the graphene oxide as a supporting material, the rod-like Ag2CO3 is loaded on the surface of the graphene oxide, and therefore, on the one hand, the dispersion degree of the catalyst can be increased, and on the other hand, the migration rate of a photogenerated charge can be quickened to improve the photocatalysis activity of the composite material. The preparation method has environmentally friendly effect and is sample in process.

The invention discloses a method for preparing aluminum powder with high tap density, which comprises the following steps: dissolving 100 weight parts of silver nitrate and one weight part of hydrogen nitrite in deionized water to form 30 to 60 percent silver nitrate solution; dissolving 60 weight parts of sodium carbonate in deionized water to form 5 to 25 percent sodium carbonate solution; adding the silver nitrate solution into the sodium carbonate solution under the condition of continuous stirring to prepare a precursor silver carbonate system, wherein the mixture is alkalescent; keeping the temperature of the precursor silver carbonate system at 15-25 DEG C, quickly adding a formidable reductant to complete the reduction reaction under the condition of continuous stirring; washing the obtained product for 15-20 times by using deionized water after reaction, and then filtering the deionized water, and drying to consequently obtain the required silver powder. Compared with the conventional vacuum atomization method, the invention has the advantages of low cost and simple operation.

The invention relates to a photocatalyst, which relates to a visible light responded AgX / Ag2CO3(X=C1, I)composite photocatalyst and its preparation method. The preparation method comprises the following steps: placing silver carbonate in an aqueous solution and ultrasonically dispersing to obtain a dispersion liquid of silver carbonate; fully dissolving halogenated ionic liquid in deionized water, heating in water bath and uniformly stirring, dropping the halogenated ionic liquid in the dispersion liquid of silver carbonate, continuously stirring for a while after dropping; after the reaction is completed, cooling to the room temperature, washing the products obtained in the reaction, and drying to obtain the photocatalyst. The preparation method has the advantages of simple process, and can effectively degrade a colored dye (methylthionine chloride) under visible light irradiation. The method uses good control synthesis function of the ionic liquid, better disperses AgX on an Ag2CO3 matrix, so that a purpose of enhancing the degradation performance of the photocatalysis.

A method of producing a hydrophilic polyurethane foam structure containing a silver salt, chosen from the group of silver sulphate, silver citrate, silver acetate, silver carbonate, silver lactate and silver phosphate, or a mixture of these salts includes the steps of (a) providing a water phase containing a surfactant, and at least one silver salt, wherein the at least one silver salt is dispersed in the water phase; (b) providing a isocyanate-terminated polyether having functionality of more than (2); (c) mixing the water phase and the isocyanate-terminated polyether, immediately transferring the resulting mixture to a mould whereby a foam structure is obtained; and (d) drying the foam structure until it has a moisture content of at most 10% (wt). The hydrophilic polyurethane foam structure produced by the method and a wound dressing containing the foam structure are also described.

The invention discloses a near-spherical porous silver powder industrialized preparation method, which comprises the following steps: (1) the material of silver carbonate is dissolved in the ammonia solution, mixed evenly and prepared into 5 to 25wt% silver ammonium solution, (2) the prepared silver ammonium solution is introduced into a spray drying device for spray drying, and the precursor powder of the near-spherical porous silver powder is acquired, and (3) the calcination of the precursor powder is conducted, and the near-spherical porous silver powder is acquired as the temperature is reduced to ambient temperature. The near-spherical porous silver powder industrialized preparation method has the advantages of simple process, easy control, low investment cost, thus being suitable for industrialized scale production and the preparation of catalyst material, electronic ceramics material, static-free material, low temperature superconducting material, electronic sizing agent, biosensor material, and inorganic antibacterial agent or deodorization and partial ultraviolet absorption functional materials; the prepared near-spherical porous silver powder has the advantages of a great amount of pore channels with dimension above micrometer connected with each other, high specific surface area and activity, high degree of crystallinity, and high yield.

The invention relates to a mesoporous silver carbonate nanorod visible light photocatalyst and its preparation method and belongs to the field of a photocatalytic material preparation technology. The preparation method comprises the following steps: firstly adding silver nitrate into deionized water, and uniformly stirring to obtain a silver nitrate solution; adding polyvinylpyrrolidone into the prepared silver nitrate solution and fully stirring to obtain a mixed solution; and dropwise adding a sodium bicarbonate solution into the mixed solution to obtain a gray suspension, carrying out centrifugal washing on the gray suspension, and drying at 50-70 DEG C to obtain the mesoporous silver carbonate nanorod visible light photocatalyst, wherein the total volume of the sodium bicarbonate solution equals to the volume of the mixed solution. The prepared mesoporous silver carbonate nanorods have advantages of uniform size, uniform dispersion, large specific surface area, multiple reaction active sites and high photocatalytic degradation activity to methylene blue in visible light.

The invention provides a preparation method of a polylactic acid-based suture line. The preparation method comprises the following steps of feeding polylactic acid, poly butylene carbonate, polycaprolactone, cyclodextrin, phenylalanine, silver carbonate, copper sulphide, magnesium chloride, povidone iodine, polyvinyl alcohol, dopamine hydrochloride, diethylene glycol adipate, thiolated chitosan, fucoidin, chlorhexidine digluconate, urea, acyclovir, sodium alginate and Vitamin K3 into a blender mixer, and mixing materials; feeding the mixture into a twin-screw extruder, and performing squeezing granulation; heating for melting, defoaming, and sequentially performing stretching twice by use of a spinneret plate; and finally performing sterilization and package, thereby obtaining polylactic acid-based suture line. The suture line prepared by the invention is high in anti-bacterial ratio and good in mechanical property, ensures that the healing time is shortened to 7-10, and is capable of accelerating wound healing; after a patient is healed, the suture line is completely absorbed, and no scar is generated on the healed surface, the comprehensive property is excellent, and the polylactic acid-based suture line can meet the application requirements of clinical medicine.

The invention relates to the field of material preparation, and specifically discloses a preparation method of a hexagonal boron nitride ceramic material stable silver carbonate semiconductor. The method comprises the following steps: (1) graphite-phase hexagonal boron nitride nano-sheets are prepared; (2) a boron nitride / silver carbonate composition is prepared with a precipitation method, wherein the prepared hexagonal boron nitride nano-sheets are subjected to ultrasonic dispersion in deionized water; silver nitrate is added; a sodium bicarbonate solution is added drop by drop under a magnetic stirring condition; deionized water and anhydrous ethanol are used in centrifugation and washing; and drying is carried out, such that a target product is obtained. According to the invention, the graphite-phase hexagonal boron nitride is prepared with a high-temperature calcination method, and is used as a carrier for preparing the boron nitride / silver carbonate composite material with a simple precipitation method, such that the obtained composite material has substantially improved activity and stability. The material has an important significance in synergetic catalysis and stable semiconductor.

The invention discloses a preparation method and use of the main ingredient of a fragrance releasing agent for tobacco with a jasmine fragrance. The method comprises: preparing benzyl-2,3,4,6-tetra-o-acetyl-beta-d-glucopyranoside by a Cohen-Kohler reaction, acetylizing glucose in the presence of a perchloric acid catalyst, reacting the product of the acetylization with bromine hydride, removing solvent, recrystallizing in diethyl ether to obtain white crystals of alpha-acetobromoglucose; and reacting the alpha-acetobromoglucose with phemethylol and silver carbonate in a ratio of 1:2:1 in a dark place, removing the solvent, purifying by silica gel chromatography column and obtaining pure benzyl-2,3,4,6-tetra-o-acetyl-beta-d-glucopyranoside. In the invention, the benzyl-2,3,4,6-tetra-o-acetyl-beta-d-glucopyranoside is used as a main precursor with the jasmine fragrance. The fragrance releasing agent for tobacco with the jasmine fragrance, which is prepared by the invention, can release target fragrance effectively. The raw materials are simple and readily available. The cost is low, and the reaction equipment is simple.

The invention discloses auto cooling fluid, comprising the following raw materials in parts: 10-18 parts of diethylene glycol, 11-14 parts of oxalic acid, 13-15 parts of 1,2-propylene glycol, 12-15 parts of ethylene glycol ethyl ether acetate, 8-12 parts of triethyl phosphonoacetate, 8-12 parts of glufosinate-ammonium, 5-8 parts of N-(phosphonomethyl)iminodiacetic acid, 6-8 parts of styrene-acrylic-triazole, 6-7 parts of 1-hydroxybenzotriazole, 6-9 parts of benzotriazole, 2-3 parts of dimeticone, 1-3 parts of hydroxyl silicone oil, 3-4 parts of a dimethyl silicone polymer, 3-5 parts of butanol, 1-3 parts of sodium hydroxide, 2-3 parts of sodium peroxide, 2-4 parts of potassium chlorate, 1-3 parts of silver carbonate, 2-5 parts of silver phosphate and 150-160 parts of purified water. The auto cooling fluid has good stability, the microbial flora can be inhibited and killed, floccules, flotage, sediments and the like are prevented, effective circulation of the cooling liquid is ensured, the fault of a cooling liquid circulating system is relieved and prevented, the anti-corrosion effect is good, corrosion to the cooling liquid circulation system can be reduced and delayed, the fault of the cooling liquid circulating system is reduced, and the service life of the auto cooling liquid is prolonged.

Silver carbonate decomposes to form silver metal by a temperature of 280 degrees Celsius. Its use in inkjet ink allows the low-cost production of conductive metallic inks. The silver metal layer could be further processed to enhance silver decorative properties and in particular light reflective properties

The invention discloses a preparation method of high-energy explosive 3,4-di(nitrofurazano)furoxan. Raw material 3-amino-4-acyl chloride oximidofurazan reacts with weak base solid silver carbonate in solvents such as tetrahydrofuran to generate an intermediate 3,4-di(amino furazano)furoxan with the yield of 80%. The preparation method disclosed by the invention overcomes the defects in the prior art, and no BAFF (B Cell Activating Factor) isomer 3,6-bi(3-amino furazan-4-base)-1,4-dioxa-2,5-diazacyclohexane-2,5-diene is generated; then, the BAFF is oxidized by using a mixture of hydrogen peroxide and concentrated sulfuric acid as an oxidant to generate the high-energy explosive BNFF, and the yield can reach 80%. The preparation method of the high-energy explosive BNFF is high in production efficiency, low in material cost, mature, stable, safe and reliable, and has engineering application prospect.

A method of producing a hydrophilic polyurethane foam structure containing a silver salt, chosen from the group of silver sulphate, silver citrate, silver acetate, silver carbonate, silver lactate and silver phosphate, or a mixture of these salts includes the steps of (a) providing a water phase containing a surfactant, and at least one silver salt, wherein the at least one silver salt is dispersed in the water phase; (b) providing a isocyanate-terminated polyether having functionality of more than (2); (c) mixing the water phase and the isocyanate-terminated polyether, immediately transferring the resulting mixture to a mould whereby a foam structure is obtained; and (d) drying the foam structure until it has a moisture content of at most 10% (wt). The hydrophilic polyurethane foam structure produced by the method and a wound dressing containing the foam structure are also described.

The invention relates to a preparation method for high-crystallinity silver powder. The preparation method is characterized by comprising the following steps of: firstly, synthesizing a silver carbonate precursor; uniformly coating the silver carbonate precursor by using a coating agent; and performing low-temperature crystal water removing, high-temperature thermal decomposition, densification sintering and washing on the coated silver carbonate precursor to obtain high-crystallinity silver powder. Due to the adoption of the method disclosed by the invention, high-crystallinity silver powder of which the particle diameter is 0.1-5 mu m and the tap density is 3.0-7.0 g / cm<3> can be finally obtained; the silver powder can be used for preparing silver slurry or silver paste for fine threads and high-accuracy printed galvanic circles; the silver powder has the advantages of high dispersity, high crystallinity, superior degree of sphericity, uniform particle size distribution, easiness for dispersing in silver slurry or silver paste and high filling characteristic, so that high-accuracy fine thread printing can be realized; and meanwhile, an obtained silver thick film has low sintering concentration rate and low bulk resistivity.

The invention provides a preparation method of silver tin oxide electric contact materials. Firstly, a method for preparing a solution is adopted, an aqueous solution containing silver nitrate and tin nitrate reacts with a sodium carbonate aqueous solution containing a sodium hexametaphosphate dispersing agent, a mixture containing silver carbonate and tine carbonate is obtained under the action of high-speed stirring and the sodium hexametaphosphate dispersing agent, silver tin oxide compound powder with fine particles is obtained through the processing of filtering, forging and mechanical grinding, the preparation of the silver tin oxide electric contact materials uniform in component in the subsequence powder metallurgy process is facilitated, and the preparing process is environmentally friendly. The preparation method of the silver tin oxide electric contact materials is simple and easy to control, short in production cycle, low in pollution, low in cost and favorable for industrial production.