57results about How to "High silver content" patented technology

The present invention relates to powder containing silver nanoparticles having an average particle size of 2 to 50 nm in an amount of 95% or more by mass and to applications of the powder. Silver-containing powder containing the silver nanoparticles is obtained by reducing a silver compound in the presence of a compound obtained by bonding polyethylene glycol to polyethyleneimine having a certain molecular weight and then by performing a concentration step and a drying step. A plastic substrate is obtained by directly applying a conductive paste that uses the powder on a plastic substrate and by performing drying.

A wound dressing comprises a wound contacting material incorporating a therapeutically effective amount of a particulate, water insoluble, inorganic silver salt containing at least 50% by weight (based on the weight of the salt) of silver for delivering silver to a wound. The preferred water-soluble, inorganic silver salt is sodium carbonate. The wound contacting material may comprise an alginate.

This is a argent metallization producing method of organic fibre and fabric, which belongs to vacuum membrane plating and electroplating technologic field and mainly solves the problems of quality and producing batches of silver-gilt organic and fabric. Through physical vapour phase deposition technology, it firstly arranges smoothly and rolls up tidily the organic fibre bundle and fabric; lay them in the vacuum room, plate silver by magnetic controlling and sputtering, and monolayer or multilayer continuously plate membrane; then plate mulriple argent membrane according to different using demands. The binding force of the metallic argentic ion and organ fibre of the present invention is strong, it has no pollution, low costs and can be continuously produced. The products are applied in such industry as electronics, war industry communication, medical treatment, special type of spinning and so on. For instance, electric shielded products, military used shielded tent, special type of spinning antibacterial materials and civil health care spinning products.

The invention discloses a method for displacement chemical silver plating on copper powder. The method comprises the following steps of: cleaning and oil removal, water washing, acid etching, water washing, catalytic liquid treating, chemical silver plating and the like. In the method, a catalytic liquid capable of preplanting catalytic mass points is developed; the surface of the copper powder is preplanted with discretely distributed palladium mass points after the copper powder is treated by the catalytic liquid at a room temperature by controlling components, pH value and treatment time of the catalytic liquid; and the preplanted palladium mass points can catalyze and promote the silver ion reduction to improve precipitation speed and to retard copper-ammonia complex ions to be absorbed on the copper surface so as to obtain a sliver plating layer with good cladding performance in the chemical silver-plating process for the copper powder. Compared with the conventional method of displacement chemical silver plating, the method realizes surface activation of the copper powder by pretreating the catalytic liquid, a silver content of the silver plating copper powder is greatly improved, the problems of poor cladding performance of replacement type chemical silver plating and the like are solved, and the method is simple in process and convenient to operate and has good application prospect.

The invention discloses an inorganic silver-loaded zeolite antibacterial paper and a preparation method thereof. In the method, the zeolite is first mixed with a sodium nitrate solution with a mass concentration of 20-30% in a solid-liquid ratio of 1 g / ml, and the reaction is carried out at 70-95 DEG C for 1 ~2 hours, centrifugation and washing to prepare Na-type zeolite; load high content of silver ions by ion exchange method to prepare inorganic silver-carrying antibacterial zeolite for papermaking. The antimicrobial agent is then added to the wet-end sheet or mixed with a coating for surface coating. Calculated by mass percentage content, the silver content of the inorganic silver-carrying zeolite antibacterial paper is 0.05-0.40%. The antibacterial paper prepared by the invention has better antibacterial performance, safety, temperature resistance and durability, simple preparation process and convenient application, and can better meet the antibacterial requirements of household paper and food packaging paper.

A method for preparing coconut shell activated carbon with a silver controlled-release sterilizing function through hydrothermal reaction is characterized in that: using coconut shell activated carbon as a raw material and silver nitrate as an impregnating liquid, preparing silver-carried activated carbon through hydrothermal reaction, and forging at a high temperature under nitrogen protecting conditions to obtain the product. The operating technology has the main characteristics that the coconut shell activated carbon is used as the raw material, the absorption capacity is high, the speed is high, and the product is durable and regenerative; silver is more effectively loaded on the activated carbon through hydrothermal reaction preparation, and high specific surface area (1000m<2> / g) and high antibacterial activity (the sterilizing time of 107 / mL is 35 minutes) are obtained; high-temperature forging is favorable to the reactivation of the silver-carried activated carbon, silver granules are more uniformly distributed on the surface of the activated carbon, and a silver controlled-release function is realized.

Provided is a silver ink including, as a major component, a silver malonate precursor represented by Formula 1 or Formula 2.

The invention discloses a preparation method of a graphene nanosilver composite material in the field of composite materials. The preparation method comprises the following steps: 1) mixing: oxide graphene and silver nitrate are mixed by a mass ratio of 1: 1.8-2.3, and are put in de-ionized water for ultrasonically dispersing by above 1 h; 2) reaction: the mixed liquid is put in a container to stir by above 18 h at room temperature; and hydrazine hydrate with a concentration of 80% and with a volume ratio of 2: 1 to the mixed liquid is added for standing by above 20 h at 95 DEG C; 3) cleaning: a reaction product is washed by the de-ionized water, and then, is washed by anhydrous ethanol; and 4) drying: the cleaned product is dried in vacuum at 30 DEG C to prepare graphene nanosilver. The prepared graphene / nanosilver composite material is excellent in electric conductivity, simple in production process and lower in cost, and saves the manpower and material resources.

The invention relates to a 3D printed tapered electrode structure of a solar cell. The 3D printed tapered electrode structure comprises a substrate, a main gate line and an auxiliary gate line; the main gate line and the auxiliary gate line both are formed by virtue of 3D printing; the main gate line and the auxiliary gate line are arranged on the substrate perpendicularly and crosswise; the auxiliary gate line is of a segmental structure; the main gate line comprises a main gate line conductive layer and a main gate line seed layer; the main gate line seed layer is laid on the substrate; the main gate line conductive layer is laid on the main gate line seed layer; the auxiliary gate line comprises an auxiliary gate line conductive layer and an auxiliary gate line seed layer; the auxiliary gate line seed layer is laid on the substrate, while the auxiliary gate line conductive layer is laid on the auxiliary gate line seed layer; the auxiliary gate line conductive layer is a tapered lamellar body. Compared with the prior art, the gate lines of the electrode structure are elaborate and controllable in morphology, the closer to the main gate line the auxiliary gate line is, the higher the auxiliary gate line is; as a result, the current carrier collecting capability of the auxiliary gate line is enhanced, and the electrical conductivity of the gate lines are improved.

The invention discloses silver paste used for printing a crystalline silicon solar cell. The silver paste used for printing the crystalline silicon solar cell is characterized by comprising paste A and paste B, wherein the paste A comprises 80-90% of silver-coated copper powder, 3-5% of paste A glass powder and 5-17% of paste A organic carrier based on mass percentages; and the paste B comprises 85-95% of silver powder, 1-2% of paste B glass powder and 4-13% of paste B organic carrier based on mass percentages. The silver paste used for printing the crystalline silicon solar cell is relatively low in cost and capable of ensuring photoelectric conversion efficiency.

A process for making a finished or semi-finished article of silver alloy, said process comprising the steps of providing a silver alloy containing silver in an amount of at least 77 wt %, copper and an amount of germanium that is preferably at least 0.5 wt % and is effective to reduce tarnishing and / or firestain, making or processing the finished or semi-finished article of the alloy by heating at least to an annealing temperature, gradually cooling the article; and reheating the article to effect precipitation hardening thereof. The avoidance of quenching reduces the risk of damage to the article.

The invention discloses nano silver-containing trimolybdate and a preparation method and use thereof as an antibacterial agent. The molecular formula of the silver-containing trimolybdate is (NH4)2-xAgxMo3O10, wherein x is equal to 0.58, and the silver-containing trimolybdate is a nanowire. The silver-containing trimolybdate is prepared by reacting ammonium heptamolybdate tetrahydrate with a silver salt in water. The invention also discloses the use of the silver-containing trimolybdate nanowire as the antibacterial agent. The use of the silver-containing trimolybdate nanowire as the antibacterial agent, which is disclosed by the invention, does not require grinding. The silver content in silver-containing trimolybdate is high, so the required amount for achieving the same antibacterial effect is small; meanwhile, the molybdenum compound also has an antibacterial function, oxy-acid radicals containing a positive hexavalent molybdenum element in the solution also have certain oxidability, and thus, the molybdenum element can promote the antibacterial effect of the silver ions; therefore, the nano silver-containing trimolybdate has double antibacterial effects, and the antibacterial capacity of the nano silver-containing trimolybdate is 1,000 times that of a micrometer antibacterial agent. The preparation method disclosed by the invention is simple, has low equipment condition requirements, reduces reaction time and is suitable for large-scale production.

The invention relates to an aluminum powder surface hydration processing method. The aluminum powder surface hydration processing method comprises the following steps that 1, the surface of aluminum powder is washed, filtered in a suction mode and dried; 2, the washed aluminum powder is placed into a solution with the volume ratio of water to ethyl alcohol being 3: 1 for hydroxylation processing; 3, a silane coupling agent is added, sulfhydrylation decoration is conducted on the aluminum powder, and filtering, washing and drying are conducted, so that the aluminum powder obtained after sulfhydrylation decoration is obtained. The invention further provides an application of the aluminum powder obtained according to the aluminum powder surface hydration processing method in preparing Al@Ag nuclear shell composite particle conductive and electromagnetic shielding filler. The aluminum powder serves as a raw material for preparing the conductive and electromagnetic shielding filler. The sulfydryl content of the surface of the processed aluminum powder is high and the processing method is simple and efficient; prepared Al@Ag nuclear shell composite particles have the advantages of being even and dense in silver shell layer, low in silver content, low in cost and the like, and have important application prospect in the fields of conductive and electromagnetic shielding composite materials and the like.

Cooking mixer supplies silver, enabling a user to take silver and foods by supplying silver to the foods during food grinding. The cooking mixer includes a container for foodstuffs to be ground, a generating power part, a connection part for connecting the container to the power part, and a rotating body mounted in the connection part and connected to a rotary shaft of the power part, the rotating body having a plurality of blades for grinding the foodstuffs, each of the mixer blades has at least one insertion space for inserting a silver body thereto. The cooking mixer naturally supplies silver to foods to be ground, for example, when fruit juice is made or foodstuffs are chopped, thereby allowing a person to regularly take silver and detect poisonous matters contained in foods. The cooking mixer protects human health.

The invention relates to a solder paste for soft brazing of aluminum and aluminum alloy and a preparation method thereof. The solder paste consists of two parts, i.e., braze alloy powder and a flux, wherein the composition of the braze alloy powder comprises the following components in percentage by weight: 15-30 percent of tin, 1-3 percent of silver and the balance of lead; the composition of the flux comprises the following components in percentage by weight: 5-15 percent of heavy metal fluoride, 65-75 percent of hydrofluoride of aminopolyether polyol and 10-25 percent of ethylene glycol. According to the solder paste and the preparation method thereof, the tin-lead-silver alloy is used as a braze for brazing the aluminum; during brazing, the silver and the aluminum in the braze react, a layer of silver-aluminum solid solution is formed on a boundary surface of the braze and the aluminum, the electrode potential difference between the aluminum and the braze is relieved, and the corrosion resistance of a brazed joint is greatly improved.

The invention relates to a controllable antibacterial textile and a preparation method thereof and belongs to the technical field of textiles for daily use. The controllable antibacterial textile is formed by taking more than 3% of silver chelated chitosan fibers and blended yarns spun by conventional fibers as weft and warp yarns, or blended yarns with the content of the silver chelated chitosan fibers of 2%-10% and the conventional yarns through interval arrangement, and grey cloth is formed by adopting a certain tissue structure; the grey cloth is subjected to procedures of desizing, scouring and bleaching, dyeing, shaping and the like by adopting a specific pH value to prepare the textile; the silver content of the prepared textile is not lower than 50ppm after the textile is washed for 50 times; and after the textile meets water with ions (common tap water), the textile has extremely good silver releasing performance. On the basis of keeping the performance of a previous conventional fiber textile, the textile also provides lasting and controllable antibacterial performance and can be used for various types of textiles including bedding, shirts, underwear and the like which are close to skin.

The invention relates to a contact element for a solder-free electrical connection. The contact element has at least one contact section that is designed to produce an electrical contact, in particular by means of insulation displacement terminations and / or a spring contact and / or crimping and / or riveting and / or screwing and / or caulking and / or folding and / or bending of a stamped grid. The invention also relates to a stannous surface coating that covers the contact element at least in sections. In order to provide a contact element having a lead-free surface coating that prevents whisker growth or minimizes such growth to a large extent, the surface coating contains between 15 and 73 mass percent of silver.

The invention relates to a controllable antibacterial towel containing silver-chelated acrylic fibers and a making method of the towel, and belongs to the technical field of daily used textiles. Yarns of the controllable antibacterial towel are blended yarns composed of 0.4%-3% by weight of silver-chelated acrylic fibers and conventional fibers, the content of the silver-chelated acrylic fibers ranges from 0.4 wt% to 1.5 wt%, the blended yarns are terry yarns fixed on ground yarns, and the blended yarns simultaneously serve as the terry yarns and the ground yarns. The silver ion content of the controllable antibacterial towel before and after being washed for 50 times is not lower than 50 ppm, and the controllable antibacterial towel has a bacteriostasis rate of 90% or above on gram-positive bacteria, gram-negative bacteria and fungi. In the washing process, if the towel fabric is washed with other clothes, the same bactericidal effect on other clothes can be achieved.

The invention discloses an in-site composite method for Ag / SBA-15 catalyzer, which comprises the following steps: taking silver nitrate as silver source, introducing silver nitrate into microemulsioncomprising silicon source, template agent, nitric acid and distilled water to be reacted, being crystallized for 24h-48h in the temperature of 80-120 DEG C in a high pressure reactor, adjusting pH value with alkali, and then being put into the high pressure reactor to be crystallized for 24h-48h in the temperature of 80-120 DEG C, filtering, washing and drying, and finally burning for 10h in a muffle in the temperature of 540 DEG C, thus obtaining Ag / SBA-15 catalyzer. The preparation method provided by the invention can prepare Ag / SBA-15 catalyzer with regular pore paths and high specific surface area and increases the silver content loaded by the Ag / SBA-15 catalyzer by adjusting the solution pH value.

The invention provides a preparation method for a polyamide silver-plated fiber. The preparation method comprises the steps that a polyamide fiber is sensitized in a sensitizing solution to obtain a sensitized fiber; a silver ammonia solution and a diethyl triamine pentaacetic acid are dissolved into water, and the pH value of the solution is adjusted to be 9.8-10.2 to obtain a plating solution; and silver plating treatment for the sensitized fiber is carried out in the mixed solution comprising the plating solution and glucose to obtain the polyamide silver-plated fiber. According to the preparation method for the polyamide silver-plated fiber, the glucose is used for replacing formaldehyde as a reducing agent for silver plating reaction, and the diethyl triamine pentaacetic acid is added into the plating solution to form a silver plating solution system matched with the plating solution, the reduction rate of silver ions in the plating solution system and the deposition rate of silver elementary substances on the surface of the fiber are adjusted, and therefore the fiber has the good conductivity and shows the good silver plating efficiency. The silver-plated fiber has the characteristics of low resistance and high silver content, wherein the minimum resistance value is about 138 omega / 10cm, the highest silver content is 15%, and the silver plating rate can reach 97%.

The invention discloses a preparation method of multielement nanomaterials and solar cell electronic silver paste containing the multielement nanomaterials. The multielement nanomaterials are prepared through a bottom-up technology. Metal organics are sequentially fed in high temperature resistant organic solvents, so that the metal organics are resolved to form metallic oxide nano-particles until the required multielement nanomaterials are formed. The multielement nanomaterials are separated from the organic solvents from a rotating centrifugal machine to be washed and dried into a powder shape. Consequently, the finished products of the multielement nanomaterials are obtained. The multielement nanomaterials are small in grain size, and capable of filling the same size on the condition that the dosage (wt%) is low, can be dispersed more evenly in electronic silver paste, improves the silver content in the paste and the conductivity of the paste after sintering, so that better ohmic contact is obtained, and photoelectric conversion efficiency is finally improved. The prepared silver paste can reduce series resistance by 80%, and improve the photoelectric conversion efficiency by 0.5%-2%.

The invention discloses a method for displacement chemical silver plating on copper powder. The method comprises the following steps of: cleaning and oil removal, water washing, acid etching, water washing, catalytic liquid treating, chemical silver plating and the like. In the method, a catalytic liquid capable of preplanting catalytic mass points is developed; the surface of the copper powder is preplanted with discretely distributed palladium mass points after the copper powder is treated by the catalytic liquid at a room temperature by controlling components, pH value and treatment time of the catalytic liquid; and the preplanted palladium mass points can catalyze and promote the silver ion reduction to improve precipitation speed and to retard copper-ammonia complex ions to be absorbed on the copper surface so as to obtain a sliver plating layer with good cladding performance in the chemical silver-plating process for the copper powder. Compared with the conventional method of displacement chemical silver plating, the method realizes surface activation of the copper powder by pretreating the catalytic liquid, a silver content of the silver plating copper powder is greatly improved, the problems of poor cladding performance of replacement type chemical silver plating and the like are solved, and the method is simple in process and convenient to operate and has good application prospect.

The invention relates to the technical field of conductive polymer composite materials, in particular to a high-conductivity and environment-friendly aramid fiber and a preparation method thereof. The high-conductivity and environment-friendly aramid fiber comprises an aramid fiber body, an adhesion layer which is arranged on the surface of the aramid fiber body and used for enhancing the stability of the conductive aramid fiber in a water environment, an adsorption layer for adsorbing silver ions in cooperation with the adhesion layer, and a silver plating layer. According to the method, aramid fibers are not damaged, no harm is caused to the environment, the prepared finished product is high in conductivity, and the silver layer is relatively high in firmness.

The invention discloses a communication circuit layer structure, which comprises a flexible circuit board, and is characterized in that a plurality of signal circuits are printed on a thin film circuit board, each signal circuit comprises an adjustment section, and the adjustment sections are printed by electronic paste with different resistance values. Through the above arrangement, the electronic paste with different resistance values is printed on each signal circuit, so that each signal circuit has an independent resistance value range, and trigger signals with different ranges are generated; the signal circuit is made of a small-resistance material, the resistance is adjusted by utilizing the electronic paste of the adjustment section, the control is accurate, and the resistance control range is expanded, so that the communication circuit can have a wider range of communication signal selection; and due to the expansion of the signal range, the same circuit structure can be applicable to more occasions, so that the situation of mutual interference of multiple combination keys is avoided during combination control among the signal circuits, and the programming design is facilitated.

A method of processing an exposed black-and-white silver halide photographic film material, the method having the steps of developing in a developer solution, fixing in a fixer solution, replenishing of fixer and developer solution, rinsing in a washing solution and drying, characterized in that fixing is performed in one step and under such conditions that a "silver equilibrium ratio" of less than 2.0 is maintained, the said ratio being defined as the ratio between actual by the film material in the rinsing step through carry-over (cross-over) of silver from the fixing solution to the washing solution and amount of silver brought into the washing solution and the total amount of silver that theoretically could be brought into the washing solution by the film material by such carry-over; a "fixer to film silver ratio" of less than 0.2 is obtained, this ratio being defined as the ratio between silver content in "running equilibrium condition of the fixer" and amount of silver in the film material to be fixed in the fixing step, wherein said "running equilibrium condition of the fixer" is the condition attained after having replenished said fixing solution twice. By this method an ecologically favourable minimization of silver content in the washing solution has been obtained without impairing the processing speed, without enhancing processing costs and without excessive regeneration.