21 results about "Bismuth hydroxide" patented technology

The invention relates to the field of inorganic material preparation, and provides a bismuth hydroxide material and a preparation method thereof. The bismuth hydroxide is sphere-like nano-particles with the particle size of 85-175 nm, the dispersity is good, and the purity exceeds 99.8%. The preparation method comprises the following steps: preparing a micelle solution from a polyethylene glycol-polylactic acid (PEG-PLA) block copolymer, adding bismuth salt into the micelle solution, carrying out a reaction, and carrying out centrifugation, washing and vacuum drying to obtain the product. Due to the unique amphipathy of the PEG-PLA micelle, bismuth ions are uniformly distributed, and the uniformity of particles is improved; the hydrophilic chain segment forms steric hindrance to inhibit particle aggregation; meanwhile, the reaction rate is slowed down, and high-concentration ammonia water is combined to ensure high purity of the product. The method overcomes the problems of uneven particle size and agglomeration in traditional preparation.

Methods for preparing catalysts for oxidative dehydrogenation (ODH) of alkanes such as ethane are provided. An exemplary method includes forming a slurry including metal oxides; one or more of a bismuth compound, an antimony compound, and a tellurium compound; a reducing agent; and water; and heating the slurry to form the catalyst. The metal oxides include an oxide of molybdenum and an oxide of vanadium. The bismuth compound includes bismuth oxide, bismuth hydroxide, or a bismuth carbonate. The antimony compound includes an oxide of antimony, an antimony acetate, or an antimony ethoxide. The tellurium compound includes tellurium dioxide. The reducing agent includes molybdenum dioxide and may further include vanadium dioxide. The methods use all inorganic reagents, with no build up COx pressure observed during the hydrothermal synthesis.

The invention belongs to the technical field of high polymer materials, and particularly relates to a radiation-resistant halogen-free flame-retardant cable material for a nuclear power station cable and a preparation method thereof. The cable material is prepared from the following components in parts by mass: 50 parts of ethylene-vinyl acetate copolymer, 20 parts of ethylene propylene diene monomer, 20 parts of ethylene-octylene copolymer, 10 parts of maleic anhydride grafted ethylene-octylene copolymer, 3 to 6 parts of silicone master batch, 180 to 220 parts of active magnesium hydroxide, 40 to 60 parts of bismuth hydroxide, 10 to 20 parts of flame-retardant synergist, 3 to 6 parts of main antioxidant and 1 to 3 parts of auxiliary antioxidant. 2 to 4 parts of TAIC (triallyl isocyanurate) and 3 to 6 parts of octaphenylcyclotetrasiloxane; the cable material has excellent radiation-resistant stability, halogen-free environment-friendly flame retardance, balanced mechanical properties and long-term thermal stability, the preparation process is simple, and the cost is controllable.

The present invention provides a rhodium-bismuth anode catalyst, a preparation method thereof, and an application thereof. The present invention utilizes different reduction orders to regulate the synthesis of different Bi components, and constructs a rhodium-bismuth alloy and a rhodium-bismuth hydroxide heterojunction by this method. The unique third-body effect of bismuth on the precious metal rhodium is utilized to reduce the poisoning of rhodium while greatly improving the ethanol oxidation activity of rhodium. The present invention directionally constructs the rhodium-bismuth alloy structure and the rhodium-bismuth hydroxide interface structure by regulating the order of addition of alkali and reducing agent, and improves the ethanol electro-oxidation activity of rhodium by regulating the electron cloud density of the rhodium d band by bismuth, and the bifunctional mechanism and synergistic effect generated at the rhodium-bismuth hydroxide interface. The method of the present invention is simple, easy to operate, and suitable for industrial preparation. The present invention introduces a small amount of Bi component on the surface of the Rh-based catalyst in order to effectively regulate the work of the Rh surface components and improve the problem of low activity of the Rh-based catalyst for EOR reaction.

The application discloses a bismuth hydroxide preparation process, which comprises the following steps: dissolving anhydrous bismuth nitrate to form a bismuth nitrate aqueous solution; stirring the bismuth nitrate aqueous solution and adding alkali liquor dropwise into the bismuth nitrate aqueous solution, wherein the stirring speed is 800-1000 r / min, the reaction temperature is 45-55 DEG C, and the pH value is 9.2-9.8, so as to generate bismuth hydroxide through reaction; performing solid-liquid separation treatment on the reaction liquid containing bismuth hydroxide to obtain solid bismuth hydroxide; preparing the solid bismuth hydroxide into slurry, adding a stabilizer dropwise into the slurry and stirring; and sequentially performing filtration, drying and screening on the slurry to obtain bismuth hydroxide powder. The application further provides a bismuth hydroxide preparation system. The bismuth hydroxide preparation process and system can effectively improve the uniformity of the reaction in the precipitation reaction stage, improve the purity of the bismuth hydroxide product, reduce the particle size deviation of the bismuth hydroxide powder, improve the uniformity of the crystal form, and improve the added value of the product.

The adhesive film for circuit connection contains conductive particles and includes a region A containing a cationic polymerizable compound, a thermal cationic polymerization initiator, and an ion scavenger in the thickness direction of the film. The cationic polymerizable compound contains an epoxy compound, the thermal cationic polymerization initiator contains an anilinium salt, and the ion scavenger contains at least one metal compound selected from the group consisting of aluminum hydroxide, aluminum oxide, magnesium hydroxide, magnesium oxide, zirconium hydroxide, zirconium oxide, bismuth hydroxide, bismuth oxide, calcium hydroxide, calcium oxide, tin hydroxide, tin oxide, manganese hydroxide, manganese oxide, antimony hydroxide, antimony oxide, silicon hydroxide, silicon oxide, titanium hydroxide, and titanium oxide.

Methods for preparing catalysts for oxidative dehydrogenation (ODH) of alkanes such as ethane are provided An exemplary method includes providing a first mixture including metal oxides; a reducing agent; and one or more of a bismuth compound, an antimony compound, and a tellurium compound; and heating the first mixture to form the catalyst. The first mixture is essentially free of water. The metal oxides include an oxide of molybdenum and an oxide of vanadium. The bismuth compound includes bismuth oxide, bismuth hydroxide, or a bismuth carbonate. The antimony compound includes an oxide of antimony, antimony acetate, or antimony ethoxide. The tellurium compound includes tellurium dioxide.

The invention relates to the technical field of chemical equipment, and discloses synthesis equipment for bismuth hydroxide preparation, the synthesis equipment comprises a tank body, a rotary table and a pipe group, a mounting disc is arranged in the tank body, the mounting disc can rotate around the central axis of the tank body, and the rotary table eccentrically penetrates through and is rotatably connected with the mounting disc; the pipe set comprises a liquid inlet pipe, a liquid outlet pipe and a coil pipe, one end of the liquid inlet pipe penetrates through the rotary table and extends to the first containing cavity, the other end of the liquid inlet pipe is connected with one end of the coil pipe, one end of the liquid outlet pipe penetrates through the rotary table and extends to the second containing cavity, and the other end of the liquid outlet pipe is connected with the other end of the coil pipe; the liquid inlet pipe is slidably connected with the rotary table and the barrel, the liquid outlet pipe is fixedly connected with the barrel, and the coil pipe can stretch out and draw back; the coil pipe is used for heating and stirring materials, the heating capacity and the stirring capacity are effectively and efficiently utilized before and after vacuum dehydration of bismuth hydroxide by adjusting the height of the coil pipe, the duration of vacuum dehydration of bismuth hydroxide is shortened, the dehydration efficiency of vacuum dehydration of bismuth hydroxide is improved, and therefore the energy-saving effect is achieved.

The invention belongs to the technical field of high polymer materials, and particularly relates to a thermoplastic oil-resistant sheath material for a nuclear power station cable and a preparation method of the thermoplastic oil-resistant sheath material. The sheath material is prepared from the following components in parts by mass: 60 parts of block co-polypropylene, 30 parts of hydrogenated butadiene-acrylonitrile rubber, 0.3 to 0.5 part of sulfur, 1 to 5 parts of zinc oxide, 1 to 1.5 parts of accelerant TT, 7 parts of maleic anhydride grafted polypropylene, 3 parts of maleic anhydride grafted ethylene-octylene copolymer, 3 to 6 parts of silicone master batch, 2 to 4 parts of carbon black master batch, 180 to 220 parts of active magnesium hydroxide, 40 to 60 parts of bismuth hydroxide and 8 to 16 parts of sericite. The antioxidant composition comprises the following components in parts by weight: 4-8 parts of ferric oxide, 1-3 parts of a main antioxidant, 0.5-1.5 parts of an auxiliary antioxidant and 3-6 parts of octaphenylcyclotetrasiloxane. High temperature resistance under irradiation-free crosslinking is achieved through block co-polypropylene, meanwhile, a dynamic crosslinking mode is adopted, hydrogenated butadiene-acrylonitrile rubber is crosslinked under the action of sulfur, PP is not crosslinked, the nature of thermoplasticity is not affected, excellent oil resistance is achieved, and the cable is suitable for the nuclear power station cable scene.

The present invention relates to the field of inorganic material preparation, and provides a bismuth hydroxide material and a preparation method thereof. The bismuth hydroxide is a spherical nanoparticle with a particle size of 85 to 175 nm, good dispersibility, and a purity exceeding 99.8%. During preparation, a micellar solution is first prepared using polyethylene glycol-polylactic acid (PEG-PLA) block copolymer, etc., and then a bismuth salt is added to the micellar solution to react, and finally the product is obtained by centrifugation, water washing, and vacuum drying. The unique amphiphilicity of PEG-PLA micelles makes the bismuth ions evenly distributed and improves the uniformity of the particles; its hydrophilic chain segments form steric hindrance to inhibit particle agglomeration; at the same time, the reaction rate is slowed down, and high concentration of ammonia is combined to ensure the high purity of the product. This method overcomes the problems of uneven particle size and agglomeration in traditional preparation.

The application discloses a preparation method of high-purity spherical bismuth hydroxide. The method comprises the following steps: dissolving bismuth oxide in excessive concentrated nitric acid and evaporating to remove excessive nitric acid to obtain a bismuth nitrate solution; cooling and crystallizing the bismuth nitrate solution, and performing solid-liquid separation to obtain solid bismuth nitrate; slowly adding the solid bismuth nitrate into ammonia water containing citric acid under stirring to perform reaction; and after the reaction reaches an end point, performing filtration, washing and drying in sequence. The method can obtain bismuth hydroxide with a purity of 5N or above, uniform particle size and approximate spherical morphology, and has a higher application prospect compared with conventional bismuth hydroxide.

The invention discloses a micro-channel continuous flow preparation method of an electrical contact material containing bismuth silver tin oxide, and belongs to the technical field of silver-based electrical contact materials. The method specifically comprises the following steps: firstly, calculating the required dosages of tin nitrate, silver nitrate, bismuth nitrate and sodium hydroxide, and respectively preparing into solutions by using water; then the prepared solutions are synchronously conveyed into a micro-channel reactor at the flow speed of 70-90 ml / min for reaction, filtering is conducted, and composite powder of silver oxide, tin hydroxide and bismuth hydroxide is obtained; the obtained composite powder is washed with water, dried and roasted, and bismuth-containing silver tin oxide composite powder is obtained; and then carrying out conventional forming, sintering and extruding procedures to obtain the composite material. According to the preparation method, the microchannel reactor is applied to preparation of the silver tin oxide electrical contact for the first time, on the basis that mass transfer is enhanced through the microchannel reactor to enable tin oxide to be evenly dispersed in a matrix, particle size distribution of oxide is controlled by limiting the flow speed of the solution, and the obtained electrical contact is uniform in microstructure and excellent in mechanical property.

The invention relates to positive electrode slurry, a preparation method, a positive electrode plate and a battery. The positive electrode slurry comprises an active substance, a conductive agent, a metal compound additive and a binder, and the metal compound additive comprises bismuth hydroxide and calcium nitrite. According to the positive electrode slurry, the performance of the zinc-nickel battery is remarkably optimized through the synergistic effect of bismuth hydroxide and calcium nitrite. Gas produced in the battery is greatly reduced, the problems of gas expansion and liquid spraying of the battery are solved, the conductivity is obviously improved, the anode current is uniformly distributed, active substances are efficiently utilized, and the cycle stability is improved.

This invention provides a flame-retardant rubber containing a bismuth-based flame retardant and its preparation method, belonging to the field of flame-retardant rubber technology. This invention uses natural rubber, nitrile rubber, styrene-butadiene rubber, and chloroprene rubber as the main base materials, while introducing at least one of bismuth oxide, bismuth oxychloride, bismuth hydroxide, and bismuth subcarbonate as an environmentally friendly flame retardant, ensuring the product's flame-retardant effect; it also reduces the use of complex solvents and potential by-product emissions, which is an important way to achieve an ideal green lifestyle. Carbon black, stearic acid, zinc oxide, decabromodiphenyl ethane, aluminum diethylphosphinate, diethyl phthalate, paraffin oil, coupling agents, insoluble sulfur, accelerators, antioxidants, and other substances are also added. Through multiple mixing and intensive kneading processes, the product's tensile properties are guaranteed while effectively improving its fire resistance, delaying ignition, reducing flame propagation speed, and enhancing the safety of product use.

The invention discloses a long-acting electrophoretic paint anti-corrosion pigment and a preparation method thereof, and belongs to the technical field of anti-corrosion pigments. The preparation method comprises the following steps: respectively preparing slurry from 10-30 parts of phytic acid phosphomolybdic acid double salt, 60-80 parts of mica or silica powder and 10-20 parts of bismuth hydroxide, sequentially mixing the slurry, and adding a silane coupling agent for surface treatment; and washing the product with deionized water after filter pressing, and then drying to obtain the long-acting electrophoretic paint anti-corrosion pigment. A coated object and a coated object product prepared from all the raw materials of the anti-corrosion pigment are environment-friendly and non-toxic, do not contain toxic heavy metal components such as lead, chromium, cadmium, tin, arsenic, mercury and the like and non-soluble conductive ions, and do not cause harm to human health and the environment when being produced and used.

The application discloses an epoxy resin emulsion for high-swimming power cathode electrophoretic paint and a preparation method thereof. The preparation method comprises a preparation step of modified epoxy resin and a preparation step of epoxy resin emulsion. The application improves the flexibility and molecular weight of the resin by simultaneously modifying the epoxy resin with polyester and polyether. The application reduces the solvent content in the emulsion system by increasing the molecular weight of the resin. The application introduces a drier, bismuth neodecanoate, into the resin system, which is low in cost and reduces the potential hydrolysis risk of bismuth hydroxide in the matching color paste. The resin emulsion formed by the application has small particle size, good stability, good curing performance, no abnormality after 40 times of MEK wiping, obviously increased flexibility, cupping and impact resistance of the paint film, and the swimming power of the four-box is more than 50%, the swimming power is obviously improved, and the performance is excellent, so that the application can be suitable for the coating of the body and parts system of a passenger car.

The invention belongs to the technical field of high polymer materials, and particularly relates to a high-temperature-resistant halogen-free flame-retardant cable material for a nuclear power station cable and a preparation method thereof. The cable material is prepared from the following components in parts by mass: 50 parts of ethylene-vinyl acetate copolymer, 20 parts of ethylene propylene diene monomer, 20 parts of ethylene-octylene copolymer, 10 parts of maleic anhydride grafted ethylene-octylene copolymer, 3 to 6 parts of silicone master batch, 2 to 4 parts of carbon black master batch, 180 to 220 parts of active magnesium hydroxide, 40 to 60 parts of bismuth hydroxide, 8 to 16 parts of sericite and 4 to 8 parts of ferric oxide. The composition comprises the following components in parts by weight: 1-3 parts of a main antioxidant, 0.5-1.5 parts of an auxiliary antioxidant, 2-4 parts of TAIC and 3-6 parts of octaphenylcyclotetrasiloxane. The cable material prepared by the invention shows excellent high temperature resistance, long service life and flame retardance, the preparation process is simple and easy to operate, the production cost is low, the productivity is stable, and the production requirements of nuclear power station cables are met.

The invention provides a sea urchin-shaped bismuth sulfide light absorption material as well as a preparation method and application thereof, and belongs to the technical field of inorganic materials. Compared with the existing commercially available bismuth hydroxide dispersion liquid, the preparation method has the advantages that the bismuth source dispersion liquid containing the bismuth hydroxide precipitate is firstly prepared, so that the microstructure and the surface property of the bismuth hydroxide precipitate can be regulated and controlled, and subsequent generation of urchin-shaped bismuth sulfide is facilitated. The dispersing agent is added into the bismuth source dispersion liquid, uniform dispersion of bismuth hydroxide can be promoted, and the particle uniformity of the final product sea urchin-shaped bismuth sulfide is guaranteed. The sulfide solution is added into the bismuth source dispersion liquid for precipitation reaction, the obtained precipitate is amorphous or spherical bismuth sulfide particles, the bismuth sulfide particles are subsequently mixed with dilute nitric acid, the pH value of the precipitation reaction liquid is adjusted to be 1.8-2.0, acidification treatment is carried out under the condition of mechanical stirring, the dynamic catalysis effect can be achieved, and the preparation method is simple and easy to implement. The transformation of amorphous or spherical bismuth sulfide particles to urchin-shaped bismuth sulfide is promoted.

The present invention discloses a method for catalytically degrading pollutants, comprising adding a trivalent bismuth salt aqueous solution to a buffered salt solution and a water mixture containing phenolic pollutants, generating bismuth hydroxide in situ in the mixture, and then utilizing the bismuth hydroxide to catalyze ferrate to degrade the water pollutants. The present invention solves the problem of how to efficiently catalyze Fe(VI) and organic pollutants in water after generating bismuth hydroxide in situ. Due to the characteristic that Bi(III) itself is extremely easy to hydrolyze to generate hydroxide precipitates, the bismuth hydroxide precipitates generated in situ in water are easy to recycle and process, will not cause secondary pollution, and can be recycled multiple times. In combination with ferrate, it can effectively achieve efficient removal of multiple phenols in water. Its application in Fe(VI) catalytic reaction efficiency enhancement has excellent application prospects.

This method for producing a positive electrode active material for secondary batteries is characterized by including: an oxidation step of adding at least one hydroxide selected from the group consisting of aluminum hydroxide, strontium hydroxide, titanium hydroxide, bismuth hydroxide, zirconium hydroxide, and barium hydroxide to an Ni-containing compound, and performing oxidation treatment by heating the mixture; a firing step of mixing an oxide obtained in the oxidation step with an Li-containing compound, and firing the mixture; a water-washing step of mixing a fired product obtained in the firing step with water or an aqueous solution, and washing the mixture with water; and a drying step of drying the wet powder obtained in the water-washing step to obtain a lithium transition metal composite oxide, wherein the heating temperature in the oxidation step is 250°C-650°C inclusive.

The invention relates to the technical field of chemical equipment and discloses a synthetic device for preparing bismuth hydroxide, comprising a tank body, a turntable and a pipe group, wherein a mounting plate is provided in the tank body, the mounting plate can rotate around the central axis of the tank body, and the turntable eccentrically penetrates and is rotatably connected to the mounting plate; the pipe group comprises a liquid inlet pipe, a liquid outlet pipe and a coil, one end of the liquid inlet pipe penetrates the turntable and extends to a first cavity, the other end of the liquid inlet pipe is connected to one end of the coil, one end of the liquid outlet pipe penetrates the turntable and extends to a second cavity, and the other end of the liquid outlet pipe is connected to the other end of the coil; the liquid inlet pipe is slidably connected to the turntable and the cylinder body, the liquid outlet pipe is fixedly connected to the cylinder body, and the coil can be extended and retracted; the coil is used for heating and stirring materials, and by adjusting the height of the coil, effective and efficient utilization of heating capacity and stirring capacity is achieved before and after vacuum dehydration of bismuth hydroxide, shortening the time of vacuum dehydration of bismuth hydroxide, improving the dehydration efficiency of vacuum dehydration of bismuth hydroxide, and thus achieving energy saving effect.