1135 results about "Silver salts" patented technology

The present invention relates to an aqueous decontaminating composition comprising(A) an amount of H2O2 less than or equal to 60% by weight, based on the total weight of said composition;(B) an RCO3H/RCO2H mixture, where R is methyl or ethyl, as indicated above, said mixture being present in an amount such that the weight ratio of said mixture to the hydrogen peroxide is between 0.15/1 and 0.85/1;(C) a silver component as a source of Ag ions, selected from the group consisting of silver salts and complexes, said silver component being present in an amount such that the weight ratio of said silver component to the hydrogen peroxide is between 0.0005/1 and 0.015/1;(D) a stabilizer present in an amount such that the weight ratio of said stabilizer to the hydrogen peroxide is between 0.0005/1 and 0.025/1; andwater to make up to 100% by weight. It further relates to the method of preparation and to the use of said composition.

A silver and silver alloy plating bath, includes (A) a soluble salt, having a silver salt or a mixture of a silver salt and a salt of a metal such as tin, bismuth, indium, lead, and the like; and (B) a particular aliphatic sulfide compound, such as thiobis(diethyleneglycol), dithiobis(triglycerol), 3,3′-thiodipropanol, thiodiglycerin, 3,6-dithiooctane-1,8-diol, and the like, which contain at least one or more of an ether oxygen atom, a 1-hydroxypropyl group, a hydroxypropylene group, or two or more of a sulfide bond in the molecule, and not containing a basic nitrogen atom. Compared to baths containing aliphatic monosulfide compounds, such as thiodiglycol or beta-thiodiglycol, which do not contain an ether oxygen atom, 1-hydroxypropyl group, a hydroxypropylene group, or two or more of a sulfide bond in the molecule, by having these particular compounds, the plating bath of the present invention has excellent stability over extended time, excellent co-deposition of silver and various metals, and excellent appearance of the electrodeposition coating.

The invention relates to a method of preparing silver nanowire by utilization of a hydrothermal method. The steps including: directly mixing ethylene glycol PVP solution which contains metal chloride with the concentration of 0.01M-2MPVP and the concentration of 1*10M-1*10-2M with ethylene glycol silver nitrate solution with the concentration of 0.01M-1M at normal temperature, stirring the mixed solution to be uniformed mixed, obtaining mixed reaction mother solution; the volume ratio of ethylene glycol silver nitrate solution to ethylene glycol PVP solution is 1:1-10:1; the molar ratio of silver nitrate to the PVP in the mixed reaction mother solution is 1:10-10:1, and the molar ration of silver nitrate to metal chloride is 10:1-104:1; putting the mixed reaction mother solution into an reaction kettle, warming the mixed reaction mother solution to 160 DEG C - 180 DEG C to carry out reduction reaction, the silver salt in the mother solution is restored, and silver nanowire is obtained. The method of preparing silver nanowire by utilization of the hydrothermal method has the advantage of being simple and high-efficient, no need of being preheated when the preliminary reaction is carried out at the normal temperature, easy to control of reaction conditions, and especially applicable to mass production.

Provided is a preparation method of silver nanowires. The preparation method of the silver nanowires includes the following steps: adding water-solubility silver salt and dispersing agents into aqueous solution comprising polyhydroxy liquid organic matters, and obtaining mixed liquor after ultrasonic dispersion; adding water-solubility halide into the mixed liquor, and obtaining reaction mother liquor after dissolving; reacting the mother liquor under 100-190 DEG C for 10-60 minutes, and obtaining mixtures; and collecting sediment after centrifugation of the mixtures, drying the sediment after washing of the sediment and obtaining the silver nanowires. The preparation method of the silver nanowires is short in preparation time.

The present invention provides a method for preparing a nano silver-carrying titanium dioxide antiseptic. The aqueous ammonia solution and silver nitrate solution are dropped into the titanium sulfate solution simultaneously with continuous stirring. The final reaction pH is controlled by ammonia water. The titanium and silver are leaded to coprecipitate. The solution is filtered and washed after maturing. Afterwards the powder of nano silver-carrying titanium dioxide antiseptic is prepared by drying and calcining. The titanic acid or metatitanic can also be taken as precursor. The slurry containing 15-25% of recursor is added with silver nitrate solution with a concentration of 20-30gL<-1>, and the phosphoric acid, sulfuric acid or hydrochloric acid is added with a concentration of 10-15mgL<-1>. The solution is reacted, filtered and washed under the temperature of 50-60 DEG C. The solid object is dried, crushed, calcined and cooled, and the power of nano silver-carrying titanium dioxide antiseptic is obtained. The invention uses generating an indissoluble silver salt with a preparing technique of titanium dioxide to obtain the sustained-releasing of silver and color changing prevention. Furthermore the complex of the electron pair and the cavity is avoided. The photocatalysis antimicrobial effect of titanium dioxide is reinforced. The color, luster, granularity and dispersibility of the product can be well controlled.

The present invention is directed to an antimicrobial composition, comprising pyrithione or a pyrithione complex; and a zinc or copper or silver source selected from the group consisting of zinc or copper or silver salts, oxides, hydroxides, sulfates, chlorides, metals, and combinations thereof; wherein the weight ratio of the zinc or copper or silver source to the pyrithione or the pyrithione complex is in the range from about 1:300 to about 50:1, and wherein the antimicrobial composition has an enhanced biocidal effect against a variety of free-living microorganisms or biofilms. Also disclosed is a method of inhibiting the growth of free-living microorganisms or biofilm utilizing the above antimicrobial composition, as well as use of such antimicrobial compositions in various products including fuels, fluids, lubricants, coatings, adhesives, sealants, elastomers, soaps, cosmetics, plastic or woven or non-woven fibers, pharmaceuticals, and as preservatives for the above products.

The present invention relates to a high-concentration nanoscale silver colloidal solution and the preparing process thereof. The colloidal solution of the present invention comprises a high content of silver particles, i.e. approximately 1.5 wt %. The mean size of the nanoscale silver is less than 10 nm. In the preparing process, silver salt, ionic chelating agent, stabilizing agent, reducing agent, solvent and reaction accelerator are homogeneously mixed together. The increase of reaction temperature by external heat source accelerates completed reaction. By using the specified reaction accelerator and chelating agent and under the operating condition of the present invention, high-density silver colloidal solution is obtained while inhibiting particle aggregation. Therefore, the resulting nanoscale silver colloidal solution contains very small-sized particles and the stability thereof is satisfactory.

The invention provides a bacteria cellulose membrane containing silver chloride nanometer particles, corresponding preparation method and application, which is characterized in that a plurality of silver chloride nanometer particles are adhered to the microfiber surface of the three-dimensional porous reticular structure of the bacteria cellulose membrane, the content of the silver chloride nanometer particle is 0.5 to 21% of the total weight and which particle diameter is 10 to 300nm. The preparation method is base on the principle of using the particular three-dimensional reticular microfibrillar structure and the high oxygen density (ether linkage and hydroxy) to constitute the synthetical effective nanometer reactors by the silver chloride nanometer particles in situ and the product is obtained after repeatedly soaking in the solution of silver salt and chloride salt, rinsing and drying. The bacteria cellulose membrane containing silver chloride nanometer particles has the advantages of excellent antibacterial performance, most simple preparation process, can be used as favorable antiseptic dressing and extracting the silver chloride nanometer particles.

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.

The invention discloses a preparation method of a nano-silver alginate fiber. The preparation method comprises the following steps of: preparing an alginic acid silver complex which is a precursor of nano-silver by using algal polysaccharides and soluble silver salts, and then preparing a sodium alginate based nano-silver colloid system through a chemical reduction method; then adding fiber-grade sodium alginate into the sodium alginate based nano-silver colloid system to obtain a nano-silver algae spinning solution; and finally, obtaining a nano-silver algae primary fiber through wet spinning, and carrying out stretching, sizing, drying and oiling treatments to obtain the nano-silver alginate fiber. The prepared nano-silver alginate fiber integrates the excellent performances of the nano-silver and the alginate fiber, so that the novel fiber has excellent flame retardance, biocompatibility, moisture absorption permeability and the like, also has excellent antimicrobial performance, antistatic performance and irradiation resistance and can be widely used in medical treatment, the fire-fighting field, the military field, the aerospace field, the health textile field and the like.

The invention discloses a linear nano silver and a preparation method and application thereof. The linear nano silver is prepared by solubility silver salt, polyhydric alcohols, inorganic salt and a linear silver guide agent. A sulfur alcohol matter which can easily precipitate from ethylene glycol is added in a nano silver reaction system at a later stage, an alkyl chain can be grafted from a silver surface to enable silver powder to easily precipitate due to the fact that sulfydryl and the silver surface have strong chemical chelation force. The method avoids a centrifugation or ultrasonic method, only needs traditional stirring and precipitating to achieve washing and collecting of the silver powder, simplifies a purification process of the nano silver, improves production efficiency, and simultaneously improves dispersibility of the linear nano silver in a non-polarity organic solvent. The linear nano silver is simple in used equipment, convenient to operate, low in cost and easy to apply, the obtained linear nano silver is high in yield, and the linear nano silver can be applied to industrialization mass production.

An organic silver salt composition used for thermally developable photothermographic material is disclosed, comprising at least two organic acids differing in melting point and their silver salts, wherein a silver salt of a lower-melting organic acid account for 10 to 80 mol % of the silver salts and the lower melting organic acid accounting for 0 to 30 mol % of the acids. A method of manufacturing an organic silver salt compositions also disclosed.

The embodiment of the invention discloses a preparation method of nano-silver dispersion liquid. The preparation method comprises the following steps that thickening agents and dispersing agents are added into pure water or deionized water, then, soluble silver salt is dissolved in solution, and the silver salt solution is obtained; and under the stirring effect, silver complexing agents are firstly added into the silver salt solution, then, reducing agents are added, or silver complexing reduction agents are directly added, the reaction is carried out for at least 12 hours under the condition of room temperature to 90 DEG C, silver ions in the silver salt solution are reduced into metal silver, the nano-silver dispersion liquid is obtained, the silver complexing agents and the silver complexing reduction agents can form the chemical bonding with the nano-silver particle surface, and in addition, functional groups with the cross linking effect are reserved. The invention correspondingly provides the nano-silver dispersion liquid prepared by the method. The process of the preparation method is simple, the stability of the prepared nano-silver dispersion liquid is good, nano-silver particles are uniform, the application is convenient, and the bonding force of the nano-silver and substrates is high. In addition, the invention also provides a preparation method of a nano-silver antibacterial coating.

The invention relates to a method for manufacturing series silver nano-sheets in a batch. The method includes dividing polyhydric alcohol, dimethyl formamide, high-polymer surfactant, metal salt adjuvant containing halogen and metal silver salt into three batches to be treated by the aid of the metal salt adjuvant containing the halogen; then uniformly mixing the materials; and obtaining the series silver nano-sheets by means of heating reaction. The silver nano-sheets are uniform in shape, high in purity, fine in monodispersity and low in cost, a reaction device is simple, large-scale preparation of the silver nano-sheets can be realized, and the method has an industrial prospect.

The invention discloses a method for continuously fabricating silver nanowires. The method mixes a glycol solution of a silver salt and a glycol solution of a polyvinyl pyrrolidone, and the mixed solution reacts in a temperature range and a time range to form the silver nanowires. The polyvinyl pyrrolidone has high boiling point and reduction ability so as to reduce the silver salt to the silver nanoparticles, and simultaneously, the polyvinyl pyrrolidone can provide barriers for limiting the particle growth. Besides, the oxygen functional groups on the long chains of the polyvinyl pyrrolidone can keep the stably one-dimensional growth of the silver nanoparticles to form the silver nanowires during the aging process.

The invention relates to compound materials of silver nano particles and the polymer microballoons carrier and its preparation method, and belongs to the nano materials and compound materials technology area. The invention takes the propylene nitrile and the styrene as the first, second monomer, takes the polyamide hydrophilicity macromonomer of the styrene sealed end as the disperses stabilizer, synthesizes the polyamide hydrophilicity macromonomer graft acrylonitrile/ styrene microsphere whose surface has the special form through the dispersion copolymerization method; takes the obtained microballoons as the carrier, in mellow or mellow aqueous medium used mellowly is the reducing agent, the soluble silver salt as the silver source, the silver ion coordinates with the amide groups of the macro-molecule chain side group on the microballoons surface, and reduces to the silver atom, and grows to form the compound materials of stable silver nano particles and the polymer microballoons carrier, the silver nano particles particle size is unceasingly 2-50nm, the distribution is homogeneous, the preparation method is easy and feasible, the response condition is temperate. The compound materials have the good Laman spectrum reinforcement and antibacterial, and may be used as the photosensitive material, the antibacterial material and the catalyzed material and so on.

The invention discloses a nanometer silver colloid solution and a preparation method thereof. The nanometer silver colloid solution is characterized in that the 100 ml of nanometer silver colloid solution comprises the following raw materials of 0.1 to 10 g of complexing agents, 0.1 to 2 g of reducing agents, 0 to 5 g of dispersing agents, 0 to 8 g of protective agents, PH (Potential Of Hydrogen) conditioning agents for performing conditioning on the PH value within the range of 4 to 10, 0.002 to 0.4 g of silver salts and the allowance purified water. The complexing agents, the reducing agents, the dispersing agents, the protective agents, the PH conditioning agents and the silver salts are dissolved in water according to the sequential order, the aging reaction is performed under a certain condition, and the nanometer silver colloid solution is obtained eventually. According to the preparation method, the severe reduction reaction is not required, the mild polyol weak reducing agents are utilized, the reaction rate is controlled by the complexing agents, and the nanometer silver colloid solution is obtained at the low temperature. According to the nanometer silver colloid solution which is prepared from the preparation method, the controllable range of the PH value is 4 to 10 and the nanometer silver colloid solution is colorless, transparent, discoloration-resistant, strong in stability and the like. The preparation method has the advantages of being simple in operation, wide in parameter adjustable range, low in energy consumption, short in cycle, suitable for mass production and the like.