11 results about "Bismuth hydroxide" patented technology

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 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.

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 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 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 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 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.

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.