21 results about "Cerium hydroxide" patented technology

The present invention addresses the main problem of providing a coating agent composition for forming a coating layer that has high transparency, is extremely hydrophilic, and has an antifouling function and an antifogging function even in a low-temperature atmosphere. The present invention also addresses the problem of providing a method for producing the coating agent composition. Further, the present invention addresses the main problem of providing a product having a coating layer in which the coating agent is used.　Provided as means for solving said problems are: a production method for a coating agent composition, the method comprising (A) a step for causing a polymer obtained through polymerization of a silicon alkoxide to coexist with cerium hydroxide and / or cerium oxide to obtain an intermediate composition, and (B) a step for causing the intermediate composition obtained in said step (A) to coexist with an acidic colloidal silica to obtain a coating agent composition; and a coating agent composition comprising a polymer obtained through polymerization of a silicon alkoxide, cerium hydroxide and / or cerium oxide, and an acidic colloidal silica.

According to the preparation method, cerium hydroxide with positive charges and without charge treatment on the surface is subjected to ultrasonic oscillation, so that a polymer or monomer containing negative charges and cerium hydroxide particles form coordinate bonds, first layer coating on the surface is realized, and surface charges are reversed into negative charges. Coating for the second time, adding a polymer with weak positive charges, polymerizing ion pairs through charge attraction, realizing secondary charge reversal and changing into positive charges. The invention discloses a method for repeatedly coating the surface of a cerium hydroxide particle, the electrical property of the coated cerium hydroxide particle is not changed, and the defect, namely particle adhesion, generated by mechanical force in the polishing process can be greatly reduced, so that the yield of a product is improved.

The present application belongs to the technical field of metal fuel, and particularly relates to a surface modification method of metal, a modified metal obtained by the method and application of the modified metal. The modification method provided by the present application comprises hydrophilic modification and oleophilic modification. The hydrophilic modification is performed by modifying the metal with cerium hydroxide, so as to improve the dispersibility of the metal in water. The oleophilic modification is performed by modifying the surface of the metal with cerium acetate, so as to improve the dispersibility of the metal in an organic solvent. The improvement of the dispersibility promotes the combustion effect of the metal.

The invention belongs to the technical field of lubricating oil, and particularly relates to a lubricating oil composition and a preparation method thereof. The lubricating oil composition is prepared from the following raw materials in percentage by weight: 4 to 9 weight percent of extreme pressure anti-wear agent, 2 to 5 weight percent of antioxidant, 0.8 to 1.5 weight percent of anticoagulant, 0.2 to 0.5 weight percent of metal deactivator and the balance of base oil, the anti-wear reagent at extreme pressure is prepared by the following preparation processes: adding black scale alkene and nano cerium hydroxide into acetone, carrying out electrostatic self-assembly under an ultrasonic condition, centrifuging and drying to obtain the anti-wear reagent at extreme pressure. The lubricating oil composition disclosed by the invention has good wear resistance and excellent oxidation resistance.

An object of the present invention is to provide a coating agent composition which forms a coating layer having high transparency, superhydrophilicity, and an antifouling function or an antifogging function even in a low temperature atmosphere. Another object of the present invention is to provide a method for producing the coating agent composition. Still another object of the present invention is to provide a product having a coating layer using the coating agent.SOLUTION: A method for producing a coating agent composition, comprising the steps of: (A) allowing a polymer obtained by polymerizing a silicic acid alkoxide to coexist with cerium hydroxide and / or cerium oxide to obtain an intermediate composition; and (B) allowing the intermediate composition obtained in the step (A) to coexist with acidic colloidal silica to obtain a coating agent composition.SELECTED DRAWING: None

In the present invention, positively charged cerium hydroxide particles without undergoing surface charge treatment are subjected to ultrasonic agitation, so that a negatively charged polymer or monomer and the cerium hydroxide particles form a coordination bond, thereby forming a first surface coating layer and reversing the surface charge into a negative charge; and in a second coating step, a weakly positively charged polymer is added, so that by means of charge attraction, a polymeric ion pair is formed, thereby achieving a second charge reversal to a positive charge. Disclosed in the present invention is a method for multiple surface coatings of cerium hydroxide particles. The coated cerium hydroxide particles do not change the intrinsic electrical properties thereof, and can greatly reduce defects caused by mechanical forces during polishing, such as particle adhesion, thereby improving the product yield.

This invention discloses an online monitoring and intelligent control system for the precipitation reaction process of high-purity cerium hydroxide, belonging to the field of reaction process monitoring and control technology. It includes: a dual-parameter tracing module for the precipitation process, a local oxidation feature capture module, a multi-signal decoupling identification module, and a zoned dynamic compensation execution module. The signals of each module are connected to a PLC control unit. In terms of precise oxidation control, this invention uses the local oxidation feature capture module to monitor dissolved oxygen and ORP values ​​in real time in four high-oxidation-risk areas, including the feeding mixing zone and the eddy shear zone. Combined with the time-series matching algorithm of the multi-signal decoupling identification module, it can accurately distinguish between precipitation disturbances, feeding disturbances, and oxidation disturbances, achieving high accuracy and low false triggering rate. The accompanying zoned dynamic compensation execution module's graded directional pulse deoxygenation strategy reduces inert gas consumption compared to continuous full-reactor aeration, while also avoiding air entrainment problems caused by continuous bubbling.

The invention belongs to the technical field of silicone rubber, and provides a nano-composite for improving heat resistance of silicone rubber and a preparation method and application of the nano-composite. The invention provides a nano-composite for improving heat resistance of silicone rubber. The nano-composite comprises a modified cerium hydroxide alcohol solution, 110 methyl vinyl silicone rubber and a structural aid, wherein the modified cerium hydroxide alcohol solution comprises ceric sulfate, white carbon black, an alcohol compound I, a precipitator, an alcohol compound II and hydroxyl silicone oil. The nano-composite transparent heat-resistant auxiliary agent is prepared through a white carbon black confinement precipitation and alcohol compound synergistic modification process, and can be mixed with a methyl vinyl silicone rubber compound to prepare a silicone rubber product. According to the method, agglomeration of nano-modified cerium hydroxide can be avoided, and the heat resistance, light transmittance and oxidation resistance of the product and the additional value of rare earth resources (cerium) are improved.

The invention belongs to the technical field of metal fuel, and particularly relates to a metal surface modification method, obtained modified metal and application of the modified metal. The modification method provided by the invention comprises hydrophilic modification and oleophylic modification, and the hydrophilic modification is used for modifying metal through cerium hydroxide, so that the dispersity of the metal in water can be improved; and the oleophylic modification is performed through cerium acetate surface modification, so that the dispersity of metal in an organic solvent can be improved. And the improvement of the dispersibility promotes the improvement of the combustion effect of the metal.

The application discloses a preparation method of a metal / cerium dioxide monatomic catalyst, which comprises the following steps: mixing an inorganic alkali solution and a cerium nitrate solution to perform hydrolysis, and then performing centrifugation, washing and drying to obtain Ce(OH)3; uniformly dispersing the Ce(OH)3 in a metal salt solution, and then performing stirring, centrifugation, washing and freeze-drying to obtain a metal precursor / cerium hydroxide; and performing a decomposition reaction on the cerium hydroxide under an inert gas to obtain a metal monatomic / cerium dioxide. 3+ The Ce on the surface of the cerium dioxide in the process is subjected to electron transfer with the adsorbed metal ions, and the metal ions are reduced; and then the metal / cerium dioxide monatomic catalyst is obtained by placing in air. The cerium dioxide is used as a carrier precursor, the metal monatomic is in-situ loaded on the cerium dioxide nanostructure through the electron transfer effect between the cerium dioxide and the metal ions, and a reducing agent is not additionally added, so that the preparation process is simple and mild, and the method has good controllability and industrial application prospect.

The invention relates to the technical field of polyester preparation, and discloses antimony-free regenerated flame-retardant antibacterial polyester and a preparation method thereof.The preparation method comprises the following steps that 1, after waste PET is recycled, regenerated BHET is obtained; (2) the regenerated BHET, a reaction type flame retardant and an organic tin catalyst are stirred and mixed, the reaction type flame retardant is a phosphorus-containing flame retardant, step heating is conducted in the inert gas atmosphere, and flame-retardant functionalized BHET is obtained after reaction; (3) the flame-retardant functionalized BHET, ethylene glycol, a titanium catalyst and a cerium compound are mixed, and the cerium compound is cerium dioxide or cerium hydroxide; then vacuumizing and carrying out condensation polymerization reaction; and after the reaction is finished, standing, cooling and pelletizing. According to the invention, regenerated BHET is used as a raw material, is subjected to flame-retardant functional modification, and then is added together with a cerium compound for condensation polymerization, so that the antimony-free regenerated flame-retardant antibacterial polyester with good hue and spinnability is prepared.

The application discloses a preparation method of a cerium hydroxide / nickel phosphide heterostructure catalyst for seawater electrolysis, and belongs to the technical fields of catalysts and batteries. Foam nickel is soaked in an aqueous solution containing nickel nitrate, urea and ammonium fluoride to perform a hydrothermal reaction, the foam nickel after the hydrothermal reaction is washed, dried, and Ni(OH)2 is obtained; a phosphorus source and the Ni(OH)2 are subjected to a phosphorization reaction under an inert atmosphere to obtain Ni2P nanometer arrays; the phosphorus source is sodium hypophosphite; cerium nitrate is added to distilled water, stirred and dissolved at normal temperature to obtain an A solution; the Ni2P nanometer arrays are used as a working electrode, soaked in the A solution to perform an electrodeposition reaction, the reaction product is washed with deionized water, dried, and a cerium hydroxide / nickel phosphide nanometer array heterostructure oxygen evolution electrode material for seawater electrolysis is obtained. The application promotes the rearrangement of an electronic structure at a heterojunction, optimizes adsorption energy of an intermediate, and thus improves the water electrolysis catalytic efficiency, has a short preparation cycle, good controllability, and good stability in seawater.

The invention relates to a core-shell layered manganese-cerium-based bifunctional catalyst and a preparation method and application thereof, and belongs to the technical field of environmental catalytic materials.The preparation method comprises the steps that manganese nitrate and cerium nitrate are dissolved in deionized water according to the molar ratio, a template agent is added, and stirring is conducted to form a homogeneous solution; dropwise adding ammonia water to adjust the pH value to be alkaline to generate manganese-cerium hydroxide coprecipitation; after standing and aging, centrifugally washing and drying to obtain precursor powder; calcining the precursor powder in an air atmosphere to obtain a manganese-cerium solid solution; dispersing the manganese-cerium solid solution in ethanol, adding cerium nitrate and diammonium hydrogen phosphate, adjusting the pH value, and stirring in a water bath to form CePO4 precursor sol; drying the sol to obtain a shell precursor; dispersing the shell layer precursor in deionized water for hydrothermal reaction; centrifugally washing a reaction product to be neutral and performing vacuum drying; and calcining in an H2 / N2 reducing atmosphere to obtain the core-shell structure catalyst taking the manganese-cerium solid solution as the core and CePO4 as the shell.

The invention discloses electronic-grade ceric ammonium nitrate and an industrial production method thereof. The production method comprises the following steps: receiving cerium chloride feed liquid from a rare earth extraction production process; adding ammonia water into the cerium chloride feed liquid to obtain a purified solution; diluting the purified solution with pure water to obtain a diluted solution; adding hydrogen peroxide into the diluted solution and applying an electric field; ammonia water is sprayed in a variable manner and added into the diluted solution, and a reaction solution containing cerium hydroxide is obtained under the reaction condition; solid cerium hydroxide is separated from the reaction solution; adding the obtained solid cerium hydroxide into concentrated nitric acid, and reacting to obtain a cerium nitrate solution; the method comprises the following steps: adding ammonium nitrate into a cerium nitrate solution, evaporating and crystallizing until crystallization begins, and slowly standing and crystallizing at normal temperature until no crystal is generated in a crystallized solution; and separating crystals from the crystallization solution to obtain ceric ammonium nitrate. According to the method, a compact process route is adopted, and the electronic-grade ceric ammonium nitrate is prepared while the yield is increased and the production cost is minimized.

This invention relates to a Prussian blue composite material, its preparation method, and its applications. First, carbon cloth is heated and ultrasonically cleaned to remove the hydrophobic coating, oily substances, and impurities from its surface. Then, the pretreated carbon is placed in a cerium salt-urea mixed solution for a hydrothermal reaction to obtain cerium hydroxide-coated carbon cloth. The cerium hydroxide-coated carbon is then placed in a tube furnace and heat-treated at 300-600°C in air for approximately 1 hour for later use. A cobalt salt-citrate mixed solution and a potassium ferricyanide solution of a certain concentration are prepared separately. The carbon obtained in the previous step is placed in the potassium ferricyanide solution, and then the cobalt salt-citrate mixed solution is slowly added dropwise through a separatory funnel. After the addition is complete, the immersion reaction is carried out for 24 hours to obtain the Prussian blue composite material. This Prussian blue composite material exhibits excellent performance in the hydrogen and oxygen evolution reactions of water electrolysis, not only reducing the energy consumption of water electrolysis but also significantly improving the hydrogen production efficiency, showing promising application prospects.

The invention relates to the technical field of waste liquid treatment, in particular to a continuous process method for deeply removing lead from a rare earth chloride solution. The method solves the problems of hydrogen sulfide escape, sulfur ion residue, discontinuous process and the like in the traditional sulfide precipitation method. The method comprises the following steps: adjusting the pH value of a solution to remove thorium, and enabling the solution to sequentially pass through a first fixed bed reaction column filled with a surface activated porous reduced iron filler and a second trapping and polishing column filled with magnetic iron oxide trapping particles and titanium dioxide coating polishing particles under an anoxic condition to realize reduction precipitation and deep removal of lead; then, barium salt precipitation is used for removing radium, and cerium hydroxide wet glue is used for adsorbing co-precipitated residual radioactive elements; the process does not need to introduce sulfides, can realize whole-process continuous operation, and has the advantages of radioactive purification, high rare earth recovery rate and good process stability.

The present disclosure relates to a method for preparing an electrolytic hydrogen production diaphragm, wherein the method comprises: mixing inorganic oxidized particles, metal hydroxide, binder and pore-forming agent to obtain a mixed slurry; coating the mixed slurry on one side or both sides of a porous base film to obtain a nascent film; soaking the nascent film in an extraction liquid and then performing a drying treatment; wherein the porous base film comprises a metal mesh; the metal hydroxide comprises one or more of nickel hydroxide, nickel oxyhydroxide, zirconium hydroxide, cerium hydroxide and yttrium hydroxide. The method provided by the present disclosure effectively improves the temperature resistance and high-temperature dimensional stability of the electrolytic hydrogen production diaphragm prepared by the method, while effectively improving the affinity of the diaphragm to the electrolyte, reducing the diaphragm resistance. Using the electrolytic hydrogen production diaphragm provided by the present disclosure in an alkaline electrolytic hydrogen production device can realize the operation of the electrolytic hydrogen production device at a temperature above 110 DEG C, and effectively improve the electrolysis efficiency.

This invention provides an allergen reducing agent that exhibits excellent allergen reduction effects. [Solution] The allergen reducing agent of the present invention is characterized by containing at least one cerium compound, which is either cerium oxide or cerium hydroxide. Therefore, it exhibits an excellent allergen reducing effect through the action of at least one cerium compound, which is either cerium oxide or cerium hydroxide, and in particular, it exhibits excellent water resistance in its allergen reducing effect. Furthermore, the allergen reducing agent of the present invention exhibits an excellent allergen reducing effect without requiring light irradiation and exhibits an excellent allergen reducing effect even in the dark.

The application discloses an online monitoring and intelligent regulation and control system for a high-purity cerium hydroxide precipitation reaction process and relates to the technical field of reaction process monitoring and regulation and control. The system comprises a precipitation process double-parameter tracing module, a local oxidation characteristic capturing module, a multi-signal decoupling identification module and a partitioned dynamic compensation execution module, and signals of the modules are connected to a PLC control unit. In the precise control of oxidation, the local oxidation characteristic capturing module is used to monitor the dissolved oxygen and ORP values of four types of high-oxidation-risk areas, such as a feeding mixing area and a vortex shear area, in real time, and in combination with a time sequence matching algorithm of the multi-signal decoupling identification module, the precipitation disturbance, the feeding disturbance and the oxidation disturbance can be accurately distinguished, the accuracy of judgment is high, the false triggering rate is low, and the hierarchical directional pulse deoxygenation strategy of the partitioned dynamic compensation execution module is matched, compared with continuous aeration of the whole tank, the consumption of inert gas is reduced, and the problem of air entrainment caused by continuous bubbling is avoided.

A process for the extraction of cerium from an aqueous solution comprising REE, the process comprising cycles of adjusting the pH of the aqueous solution to 5-5.5 by the addition of NaOH, and then adding H2O2 until a pH of 3-5.5 in order to precipitate Ce(OH)4; wherein the amount of H2O2 in the second and subsequent cycles allows the pH to be maintained in the range of 3-5.5; wherein the cycles are repeated until the total amount of NaOH added to the aqueous solution reaches from 90% to 115% of the stoichiometric amount to convert all the rare earths into their hydroxides; separating by filtration the precipitate comprising Ce(OH)4 to obtain an aqueous solution mainly comprising non-Ce REE; and recovering the non-Ce REE from the aqueous solution. And use of the non-Ce rare earth elements recovered by the process above for the preparation of an article of manufacture.

The invention discloses zirconia biological ceramic with high toughness and high low-temperature aging resistance and a preparation method of the zirconia biological ceramic, and belongs to the technical field of preparation of ceramic-based composite materials. The preparation method of the biological ceramic comprises the following steps: dipping a green body in a mixed solution of aluminum nitrate, cerous nitrate and magnesium nitrate under negative pressure, then taking out and soaking in ammonia water, reacting aluminum nitrate, cerous nitrate and magnesium nitrate with ammonia water to obtain aluminum hydroxide, cerium hydroxide and magnesium hydroxide, then calcining to obtain aluminum oxide, cerium oxide and magnesium oxide, and repeatedly dipping to obtain the biological ceramic. Green bodies with different thicknesses can be obtained; and sintering the green body to obtain the zirconium oxide biological ceramic. By adopting a precursor dipping method, pressure stress is formed on the zirconium oxide surface layer, so that the strength, the fracture toughness and the low-temperature aging resistance of the zirconium oxide ceramic are improved.