31results about How to "Increase silver loading" patented technology

The invention relates to the technical field of medical apparatus and instruments, which discloses a sustained release type antibacterial medical catheter and a preparation method thereof. A silver inorganic antimicrobial is characterized by high content of silver, safety and the like, and the silver inorganic antimicrobial which adopts zirconium phosphate as a carrier is selected and mixed into catheter material to prepare the sustained release type antibacterial medical catheter that is most widely applied to clinic, such as an antibacterial catheter, an antibacterial central venous catheter, an antibacterial trachea cannula and the like. The catheter has high use safety, wide antibacterial spectrum, good antibacterial effects, antimicrobial constituent sustained release and long duration of antibacterial effects, and can reduce the frequency of replacing medical catheters so as to have safe and convenient clinical use, effectively reduce nosocomial infections related to catheters due to the use of the medical catheters, greatly reduce medical expenses related to anti-infection, and the like, and save medical resources.

The invention relates to a method for purifying and recycling mercury in flue gas, wherein the method is applicable to mercury desorption from coal-fired flue gas, and mercury purification and recycling from mercury-contained flue gas in nonferrous industries and belongs to the fields of atmospheric pollution control technologies and heavy metal pollution control. The method comprises the following steps: immerging activated carbon fiber in a 15-45wt% phosphoric acid solution or zinc chloride solution or ammonium salt solution for 12-24 hours, and then taking out the immerged activated carbonfiber, and airing the immerged activated carbon fiber for standby; adding the dried activated carbon fiber into a prepared 0.001-1 mg/L sliver-contained ion solution, agitating for 4-24 hours in a thermostatic water bath, filtering out the solution, flushing the activated carbon fiber repeatedly by using de-ionized water, filtering out the solution, flushing the activated carbon fiber repeatedly by using distilled water, and then drying the flushed activated carbon fiber at 50-105 DEG C in vacuum; regenerating the activated carbon fiber by using low-temperature plasma after the prepared silver-loaded activated carbon fiber is saturated with adsorbed mercury; and further recycling the volatilized mercurial vapor which enters a condenser, and flows back to a storage tank after being condensed. The method for purifying and recycling the mercury in the flue gas has the effects of rapidness, high efficiency, and low loss of carbon for the mercury desorption; and in addition, the mercurial vapor is reused by means of condensation and recycling.

The invention relates to a regeneration and activation technique of solid adsorbent polluted by iodine, which comprises the following steps in sequence: the solid adsorbent polluted by iodine is placed in 0.01 to 1 percent of acetic acid for cleaning; (2) the cleaned adsorbent is soaked in sodium thiosulfate solution with the concentration of 0.01 to 2 percent in static state or placed in a column and the sodium thiosulfate solution with the concentration of 0.01 to 2 percent is injected for regeneration so as to lead the pollutants in effective pore channels of the adsorbent polluted by iodine to be precipitated completely; (3) then the obtained adsorbent is placed in the column and ion exchange is carried out by injecting active metal Ag<+> solution till the concentration of the active metal Ag<+> on the solid adsorbent reaches the concentration before the solid adsorbent is polluted. The invention has low energy consumption and convenient operation, in particular to the regenerative technique condition that any heating facility is not used, the concentration of the used regenerative liquid is low and can effectively desorb iodine pollutants; the appearance of the activated adsorbent is same as new carriers, is off white, is characterized by high silver-loaded quantity and high adsorption and effectively prolongs the service life of the adsorbent, thus reducing the cost of iodine desorption.

The invention relates to the field of organic coatings and discloses a quick-forming organic antiseptic protective film for the metal surface. The organic antiseptic protective film is formed by curing an organic antiseptic protective coating, the organic antiseptic protective coating is prepared from components in parts by mass as follows: 40-50 parts of an acrylic emulsion, 5-15 parts of inositol hexaphosphate, 5-15 parts of hydrated magnesium-aluminum silicate filler, 3-7 parts of iron oxide red, 3-7 parts of antibacterial particles, 2-4 parts of a compound tackifier, 3-7 parts of pigment, 0.5-1.5 parts of a dispersing agent, 0.5-1.5 parts of a defoaming agent, 3-7 parts of ethanol and 10-20 parts of water. The quick-forming organic antiseptic protective film has high binding force with the metal surface, no bubbles are generated after the film is formed, and the organic antiseptic protective film is corrosion resistance and ageing resistance and has an antibacterial property.

The present invention relates to preparation process of sea water desalting agent, and belongs to the field of sea water desalting technology. The sea water desalting agent is prepared through soaking process including the following steps: 1. preparing acid zeolite through soaking zeolite in acid solution or ammonium salt solution for ion exchange at 25-80 deg.c, washing, filtering and stoving; 2. preparing silver-carrying acid zeolite through soaking the acid zeolite in silver ion solution for ion exchange at 60-120 deg.c in heliophobic condition, washing, filtering and stoving; and 3. mixing the silver-carrying acid zeolite, silver oxide and barium hydroxide in heliophobic condition to obtain the sea water desalting agent. The process is simple and suitable for industrial production, and has facile material. Adopting unique vacuumizing method can result in silver carrying amount up to 22 %.

The invention relates to a silver-loaded antibacterial master batch and application thereof, and belongs to the technical field of antibacterial materials. The silver-loaded antibacterial master batch is prepared from the following raw materials in parts by weight: 15 to 25 parts of silver-loaded hyperbranched polyester, 0.1 to 1 part of compatibilizer and 30 to 40 parts of carrier resin. The silver-loaded hyperbranched polyester contains a large number of cavities, each cavity contains a pyridine ring, nitrogen atoms on the pyridine ring and silver ions form coordinate bonds, then silver loading is completed, and the high silver loading amount can be achieved; a siloxane chain contained in a molecular chain of the hyperbranched polyester has excellent wettability, so that the hyperbranched polyester and the carrier polyester have good compatibility, and a branched structure of the hyperbranched polyester promotes the hyperbranched polyester to be dispersed more uniformly in the carrier resin; the hyperbranched polyester contains a large number of terminal hydroxyl groups, so that the bonding property between the hyperbranched polyester and carrier resin is relatively strong. Therefore, the antibacterial master batch has good antibacterial property and durability of the antibacterial property.

The invention provides silver-loaded zirconium phosphate as well as a preparation method and application thereof. The preparation method comprises the step of reacting a mixed solution containing a water-soluble silver salt, a reducing agent and zirconium phosphate to obtain the silver-loaded zirconium phosphate. According to the method, an in-situ reduction method is adopted, silver ions are directly subjected to a reduction reaction on the surface of zirconium phosphate and in mesopores through a reducing agent, and the silver-loaded zirconium phosphate is obtained. The silver-loaded zirconium phosphate provided by the invention has relatively high silver loading capacity and is suitable for being used as an antibacterial agent, and the preparation method provided by the invention is simple and easy to operate and mild in process conditions.

The invention discloses an antibacterial and fouling-resistant PVDF (Polyvinylidene Fluoride) ultrafiltration membrane for water filtration. The ultrafiltration membrane mainly comprises the followingcomponents in parts by weight: 100 parts of polyvinylidene fluoride, 15-35 parts of polyethylene glycol and 3-15 parts of silver-loaded chitosan. The preparation method comprises the following steps:dissolving polyvinylidene fluoride and polyethylene glycol into an N-methyl pyrrolidone solvent, and uniformly mixing by a solution blending method; preparing a silver-loaded chitosan solution by chitosan, dipping a polyvinylidene fluoride membrane into the silver-loaded chitosan solution, and drying, thereby obtaining a hydrophilic antibacterial and fouling-resistant PVDF micro-porous membrane.The PVDF micro-porous membrane prepared by the method disclosed by the invention has excellent hydrophilic property and can achieve the effects of killing microbial flora on the surface and reducing the adhesion amount of proteins in sewage. Meanwhile, the proteins can be inactivated, and the service life of the PVDF membrane is effectively prolonged.

The invention relates to a method for plating silver on the surface of a carbon material. The method comprises the steps that firstly, the carbon material is subjected to surface modification througha surface sizing agent, then a silver salt solution is added, after the solution is evenly mixed, drying is conducted, and high-temperature heat reduction is conducted in the inert atmosphere to obtain the surface silver-plated carbon material. According to silver particles in the obtained silver-plated carbon material, the size range is 10-600 nm, and the silver content is 15-60wt.%. A preparation process is simplified, impurity residue is lowered, the binding strength of a coating is improved, the conductivity of the carbon material is enhanced, and the method has important application valuein the fields such as conductive composite materials and electromagnetic shielding materials.

The invention discloses a preparation method of antibacterial silver-loaded activated carbon, wherein the method comprises the following steps: 1) weighing a certain amount of activated carbon, and soaking in an AgNO3 solution; 2) selecting a deflocculating agent, and dissolving the deflocculating agent in the AgNO3 solution under an ultrasonic condition; 3) slowly dropwise adding a glucose solution into the AgNO3 solution in a stirring state, heating in a water bath, and magnetically stirring; (4) filtering the product obtained in the step (3), washing with water multiple times, removing theredundant glucose until Ag<+> is completely removed, and carrying out vacuum drying; and (5) drying the product obtained in the step (4) in a blast drying oven, and firing in a tubular furnace at a high temperature of 500 DEG C in a nitrogen atmosphere so as to obtain the product.

The invention relates to a preparation method of a silver-silicon antibacterial composite material. A device involved in the method is composed of a vacuum feeding machine, a vacuum feeding machine discharging port, a powder conveying pipeline, a transition bin feeding port, a transition bin, a transition bin discharging port, a helical ribbon mixer, a longitudinal solution conveying pipeline, a solution nozzle, a transverse solution conveying pipeline, a solution conveying bent pipe, a liquid storage tank, a light source, a mixer discharging port, a stock bin, a mixer support and moving wheels. Crystalline elemental silicon and silver nitrate are used as raw materials by adopting a dry method or a semi-dry method, the silver nitrate is sprayed on a silicon carrier to obtain semi-dry powder, the semi-dry powder is irradiated by ultraviolet light or sunlight, semiconductor silicon generates electrons and holes under an illumination condition, and the silver nitrate is reduced into the elemental silver after obtaining the electrons, so that the silver-silicon antibacterial composite material is formed. The method has the advantages of simple preparation process, low process energy consumption, no need of adding an additional reducing agent, and no silver ion precipitation. The removal rate of the composite material on escherichia coli, staphylococcus aureus, the total number of bacterial colonies and the like is up to 99%, and the composite material is suitable for large-scale industrial production.

The invention discloses a preparation process of an inorganic-organic composite complex antibacterial agent, relates to the technical field of inorganic-organic composite antibacterial agents, and solves the problems of poor discoloration resistance, poor antibacterial durability and poor salt tolerance of a conventional silver ion antibacterial agent through preparation of a complex. The application of the prepared antibacterial agent in light-color products, alkaline environments and products or environments containing chloride ions is successfully realized, the application range of the antibacterial agent is expanded, and the application effect of the antibacterial agent is ensured.

The invention discloses a preparation method of medical stone silver-loaded antibacterial regenerated polyester fibers, which comprises the following steps of: independently metering 5-7 percent by weight of dried medical stone silver-loaded antibacterial master batch and 93-95 percent by weight of dried regenerated polyester chips by using an on-line injection machine, uniformly mixing the medical stone silver-loaded antibacterial master batch and the regenerated polyester chips, and uniformly mixing the medical stone silver-loaded antibacterial master batch and the regenerated polyester chips, so as to obtain the medical stone silver-loaded antibacterial regenerated polyester fibers. Stirring and blending, melting and extruding by a screw extruder, spinning by a spinneret plate, cooling by circular blowing, winding and falling into a barrel to obtain a precursor; and carrying out post-spinning drafting, tension heat setting, curling, cutting and packaging on the protofilament to obtain the medical stone silver-loaded antibacterial regenerated polyester fiber. The medical stone silver-loaded antibacterial regenerated polyester fiber has lasting antibacterial ability.