88 results about "Cerium hydroxide" patented technology

The invention relates to pearlescent pigments comprising a metal oxide-containing, lamellar substrate that is provided with a first and a second protective layer, the metal oxide having a refractive index of more than 1.8. A first protective layer comprising cerium oxide and/or cerium hydroxide as well as a second protective layer which is made of SiO2 and onto which an organic-chemical secondary coating containing at least one silane with at least one functional binding group and at least one silane without a functional binding group is applied, are provided, metal oxide layers that are different from cerium oxide and SiO2 being optionally placed between the first and the second protective layer. The invention also relates to a method for producing the disclosed pigments and the use thereof.

The invention discloses a method for preparing cerium hydroxide. The method is characterized by comprising the following steps: dissolving cerous carbonate of which the purity is greater than 99.99% as a raw material by using nitric acid to obtain cerium nitrate feed liquid; carrying out hydrolysis to remove impurities in the dissolving process, and filtering for at least two times; filtering the obtained filtrate by using a precision filter, and transferring into a storage container to stand for a plurality of days, wherein the content of general non-rare earth impurities of the obtained cerium nitrate feed liquid is smaller than 5ppm; transforming the purified feed liquid into cerium hydroxide by taking ammonium hydroxide as a transforming agent and hydrogen peroxide as an oxidant; soaking and washing by strong alkalinity liquid to remove nitrate; filtering prepared cerium hydroxide; washing a filter cake by overheated secondary water, and pumping; putting the filtered material into an oven, and baking at 90-95 DEG C for a plurality of times, so as to obtain a cerium hydroxide product with over-high purity and ultra-high gross. According to the cerium hydroxide product prepared by the method, the nitrate content is smaller than 500ppm; the rate-earth purity is greater than 99.99%; the content of general non-rare earth impurities is smaller than 10ppm; the Cl<-> content is smaller than 10ppm; the SO4<2-> content is smaller than 10ppm; the oxidation rate is 98-99.9%; the oxide gross is greater than 90%.

The invention discloses an impregnation liquid special for a lead-calcium alloyed grid, which comprises, by weight, 5-10% of phosphoric acid, 10% of antimonous oxide, 7-12% of zinc oxide, 5-15% of aluminum sesquioxide, 5-8% of ammonium bicarbonate, 3-5% of cerium hydroxide, 7-15% of tin oxide, and the balance of water. According to the technical scheme, technical operation is simple, formation of a high-resistance layer (CaSO4 crystal) on an active material interface during use of positive grids can be avoided greatly, deep cycle performance of a lead-calcium alloy battery can be improved, and the defect that early capacity loss of a VRLA (valve regulated lead acid) lead-calcium alloy battery is overcome. The battery made of the lead-calcium alloyed grid has no acid gas leakage, is fine in sealing performance, lower in gassing quantity and lower in self-discharge, and has advantages of both the lead-calsium battery and the lead-antimony-cadmium alloy battery, electrical property of an anode film of the grid is improved to the maximum extent, and deep-cycle durability of the lead-acid battery is improved.

The present invention relates to a method for preparing single crystalline cerium oxide nanopowder capable of easily controlling the shape and granularity of particles. The method includes preparing cerium hydroxide by precipitating a cerium salt in the presence of a solvent mixture of organic solvent and water and hydrothermally reacting the prepared cerium hydroxide. The prepared single crystalline cerium oxide has a particle size of not less than about 30 nm and an excellent degree of dispersion.

The invention discloses flame-retardant ceramic silicone rubber and a preparation method and application thereof. The flame-retardant ceramic silicone rubber is prepared from the raw materials in parts: 85-100 parts of raw rubber with 0.04% vinyl content, 0-15 parts of raw rubber with 3% vinyl content, 5-8 parts of hydroxy silicone oil, 40 parts of fumed silica, 15-25 parts of aluminum hydroxide/magnesium hydroxide, 0.5-0.8 part of a platinum flame retardant, 0-50 parts of mica powder, 0-10 parts of kaolin, 0-10 parts of wollastonite, 0-10 parts of low-melting-point glass powder, 0-2 parts ofzinc borate, 0-1 part of cerium hydroxide, 0-0.8 part of a silane coupling agent, and 2 parts of a vulcanizing agent. The flame-retardant ceramic silicone rubber has high thermal stability, and has the characteristics of excellent weather resistance, excellent electrical insulation properties, non-toxic and tasteless and environmental protection.

The invention discloses a preparation method of anhydrous ceric sulfate, taking high-purity cerium hydroxide as a raw material, and comprising the following steps: using industrial concentrated sulfuric acid to carry out acid dissolution on cerium hydroxide, controlling the (H<+>) mol/L of spent acid of the acid solution, the Ce<4+> dissolved concentration (g/L) of the acid solution and the dissolving temperature to fully dissolve the cerium hydroxide, then carrying out concentrated crystallization, cooling and filtering to obtain crystallized ceric sulfate which is put into a crucible and dehydrated and dried in a drying box, and then obtaining the product, namely anhydrous ceric sulfate. The anhydrous ceric sulfate prepared by the method has high product purity, good water solubility, short process flow and convenient operation, and is easy for scale production; in addition, the mother liquor can be reused, thereby playing a role of energy saving and emission elimination.

The method provides a method recovering rare earth from precise instrument waste glass materials. The method comprises the following steps of levigating waste glass materials, roasting in an alkali method to enable acid oxide to be dissolved in molten alkali, washing and filter to remove soluble salt after roasting, using acid to adjust potential of hydrogen (pH) of filter liquor to enable silicic acid to settle, obtaining boric acid through concentration crystallization to separate silicic acid from the boric acid, acid dissolving, oxidizing and settling filter residue, filtering to obtain tetravalent cerium hydroxide and filter liquor, settling lanthanum through a double-salt sedimentation method, and separating yttrium from gadolinium. The method can conveniently and effectively purify and prepare rare earth products from optical waste glass materials to comprehensively recover silicon dioxide, boric oxide and rare earth.

The invention relates to an ultrasonic assisted method for preparing a supported copper oxide catalyst by using cerium oxide as a carrier. An excess amount of an alkali is added to an aqueous solutionof a copper salt and a cerium salt, and the alkali dissolving process is an exothermic process; the copper salt forms a copper hydroxide precipitate, and is further converted into small copper oxideparticles by using the exothermic process; the cerium salt forms a cerium hydroxide precipitate, and forms cerium oxide having a hole structure in an exothermic environment; the obtained sample is sonicated for a certain period of time to generate local high-temperature and high-pressure "hot spots" in order to promote the copper oxide enter holes of the cerium oxide and form mixed oxides; and centrifugal washing, freeze drying and high temperature calcination are carried out to obtain the final catalyst. The close combination and interaction between copper oxide and the cerium oxide carrier and partial unsaturated coordination of the copper oxide part make defective copper oxide having good redox ability formed, so the complete oxidation of carbon monoxide under hydrogen-rich conditions at a low temperature in a wide window range by the catalyst is achieved.

A process of extraction of high-purity soluble cerium hydroxide from a fluorine-carbon-cerium mixed rare earth carbonate comprises the steps: taking the mixed rare earth carbonate, firstly dissolving by an acid, then removing SO4<2->, next carrying out hydrolytic precipitation of cerium to generate cerium hydroxide, then dissolving cerium hydroxide in the hydrochloric acid medium to form a Ce<4+> solution with the hydrochloric acid weak acidic medium, controlling conditions, precipitating again in the weak acidic medium to make a lot of metal impurities remain in the solution, and thereby obtaining cerium hydroxide which contains the quite low content of non rare earth impurities and can be easily dissolved in a nitric acid medium. Hydrolytic precipitation of the rare earth adopted by the invention is complete, so a large amount of alkali is saved; an oxidant is added to allow cerium to be greatly oxidized into tetravalent cerium, and thus achievement of hydrolytic precipitation is facilitated, so as to realize an effect of high percentage extraction of cerium. The process generates a small amount of waste water, is simple, has low preparation cost, is expected to large-scale industrial production, and has certain economic benefits and quite good social benefits.

The invention relates to a production method of ceria powder polishing size. The production method comprises the steps that cerium hydroxide and/or cerium carbonate are added to a baking furnace, and the baking furnace is gradually heated up from room temperature to a temperature of 1000 DEG C to bake the cerium hydroxide and/or the cerium carbonate and then thermally-preserved for 2 to 4h; ceriapowder is mixed with acid according to a mass ratio of 1:1 to 3, and the size with a pH (potential of hydrogen) of 3 to 5 is obtained; and after the size is roughly ground for 10 to 20h and fine ground for 0.3 to 3h, the polishing size is obtained. The production method has the advantages that the ceria powder size is produced by adopting a multilevel temperature baking manner, so that the hardness of ceria can be increased, and the hardness and the surface activity of the ceria can simultaneously reach better states; through regulating the pH of the size, ceria particles have low probabilityof agglomeration, the suspension ability and the stability of the size are good, and dispersion agents do not need to be added, so that the influence of the dispersion agents on the stability of the size can be eliminated; the process is simplified; and the cost is reduced.

The invention belongs to the technical field of storage batteries, and specifically relates to a lead plaster composition of a positive electrode of an internally formalized storage battery. The lead plaster composition of the positive electrode of the internally formalized storage battery is prepared from the following raw materials in parts by weight: 990-1010 parts of lead powder, 0.5-1.5 parts of fibers, 0.5-1.0 part of phosphoric acid, 1-2 parts of antimonous oxide, 0.7-1.2 parts of zinc oxide, 0.5-1.5 parts of aluminum oxide, 0.5-0.8 part of ammonium hydrogen carbonate, 0.3-0.5 part of cerium hydroxide, 0.7-1.5 parts of tin monoxide, 110-130 parts of water and 80-90 parts of dilute sulphuric acid. The lead plaster composition of the positive electrode is improved, so that capacity attenuation of the internally formalized battery in the early stage is inhibited, and the service life of deep circular discharge of the battery is prolonged.

The invention discloses an antibacterial aging-resistant modified fluororubber composite material. The antibacterial aging-resistant modified fluororubber composite material comprises fluororubber 2601, fluororubber 2605, epichloro-hydrin rubber, Bisphenol AF, benzyltriphenylphosphonium chloride, light magnesium oxide, accelerant NA-22, calcium hydroxide, cerium hydroxide, barium sulfate, nano-silver, nano-zinc oxide, nano-titanium dioxide, polytetrafluoroethylene, graphite, molybdenum disulfide, palm wax, anti-aging agent MC, anti-aging agent MB, N,N-diethyl aminopropyl methyldimethoxysilane, octamethylcyclotetrasiloxane, 3-chloro-2-hydroxypropyltrimethylammonium chloride, and polyphosphazene. The antibacterial aging-resistant modified fluororubber composite material possesses excellent antibacterial properties, heat resistance, and aging resistance, and long service life.

The invention relates to a surface treatment method of a rear-earth magnesium alloy casting product. The surface treatment method sequentially comprises the following steps of: immersing the rear-earth magnesium alloy casting product in 0.02mol/L-0.12mol/L of cerium sulfate aqueous solution in an ultrasonic precipitating-crystallizing device after carrying out oil-removing and impurity-removing pre-treatment onto the rear-earth magnesium alloy casting product; adding a magnesium hydroxide solution to regulate the pH value to 8-11; adding hydrogen peroxide to generate cerium hydroxide, wherein the mass percentage concentration of the hydrogen peroxide is 5%-20%, and the weight ratio of the using amount of the hydrogen peroxide to the cerium hydroxide aqueous solution is (1-5):100; generating a precipitated and crystallized compact tetravalent cerium protective film on the surface of the rear-earth magnesium alloy casting product by the cerium hydroxide under the ultrasonic action; and getting out the rear-earth magnesium alloy casting product from the precipitating-crystallizing device, and drying at 120 DEG C to 240 DEG C after water-washing to obtain the rear-earth magnesium alloy casting product coated with cerium dioxide on the surface. The surface treatment method of the rear-earth magnesium alloy casting product can be used for forming a compact tetravalent cerium protective film on the surface of the rear-earth magnesium alloy casting product; moreover, the process is simple and reliable.

The invention relates to a ceramic silicon rubber glass fiber composite insulating rubber for welding machine transformers and other transformer winding wires. D. ₄ , vinyl silicone oil, zinc oxide, sodium bisilicate, quartz powder, muscovite powder, phlogopite powder, melamine, cerium hydroxide, 4# fumed carbon black, superfine calcined clay, hydroxyl silicone oil, surface treatment The base rubber is kneaded at room temperature, and then vulcanized by adding a vulcanizing agent and vulcanized on an open mill. The beneficial effects of the present invention are: 1. Fire resistance, high and low temperature resistance, odorless, non-toxic, non-corrosive, and little negative impact on the environment; 2. High insulation, high resistance to compression deformation and excellent low-temperature elasticity; 3. The production process is simple and safe, the production speed is high and the efficiency is high, and the product is easy to realize.

Disclosed is a cathode for use in an electrolysis process accompanied by the generation of hydrogen, mainly for use in the brine electrolysis in an ion exchange membrane method, in which the increase in an electrolysis voltage can be prevented even when an electrolysis current density is high and the energy cost can be reduced. Specifically disclosed is an electrode for use in the generation of hydrogen, which comprises an electrically conductive metal and an electrode active material that coats the electrically conductive metal and comprises at least one component selected from metal cerium, a cerium oxide and a cerium hydroxide and metal platinum, wherein the electrode active material has such an enormously cerium-rich composition that the molar fractions of platinum and cerium are 15 to 30 mol% and 70 to 85 mol%, respectively, in terms of metal contents.

The invention discloses a nano silver modified fluororubber composite material. The nano silver modified fluororubber composite material comprises fluororubber 2601, fluororubber 2605, EPDM, butadiene-acrylonitrile rubber, ethylene-octene copolymer, calcium hydroxide, cerium hydroxide, light magnesium oxide, barium sulfate, nano-silver, nano-zinc oxide, nano-titanium dioxide, 4,4'-(Hexafluoroisopropylidene)diphenol, dibenzoyl peroxide, sulphur, palm wax, accelerant DM, accelerant CZ, anti-aging agent MC, anti-aging agent MB, N-beta-(aminoethyl)-gamma-aminopropyltrimethoxysilane, alpha, omega-dihydroxyl polydimethylsiloxane, and 3-chloro-2-hydroxypropyltrimethylammonium chloride. The nano silver modified fluororubber composite material possesses excellent antibacterial effect, processing performance, heat resistance and low temperature resistance, and long service life.

The invention relates to a flame-retardant polypropylene material. The material is prepared from 35 parts of a polypropylene random copolymer, 11 parts of maleic anhydride grafted polypropylene, 8 parts of powdery polyphenylene sulfide, 13 parts of hydroxyl-terminated hyperbranched polyester, 9 parts of a rare earth coupling agent, 18 parts of ammonium polyphosphate, 5 parts of cerium hydroxide, 15 parts of coupling agent modified nano talcum powder and 3 parts of an antioxidant. A preparation method of the material comprises the steps as follows: (1) weighing raw materials in a formula in theweight ratio, putting the raw materials in a high-speed mixer, and stirring the raw materials for 25 min to be uniformly mixed; (2) putting the mixed raw materials in step (1) in a feeding hopper ofa twin-screw extruder, and performing melt extrusion and granulation; the processing technology is as follows: the temperature range of a barrel of the twin-screw extruder is 190 DEG C and the temperature of a die head is controlled at 170 DEG C. The material has the benefits as follows: the material has high mechanical strength, good elasticity and flame-retardant effect and excellent wear resistance and tear resistance.

The invention aims to disclose a cerium hydroxide heat stabilizer and a preparation method thereof. The rare earth content of the heat stabilizer is 90-95 percent; the cerium oxide content (CeO2/TREO) of the heat stabilizer is more than or equal to 99.9 percent; the burning weightlessness amount of heat stabilizer is 5-10 percent; and the average grain diameter D50 of the heat stabilizer is 0.5-3 microns. Compared with the existing product, a silicon rubber product prepared by using the cerium hydroxide heat stabilizer has the advantages of high heat-resistant performance, good product color and the like, so that the aims of the invention are fulfilled.

A raw material composition for producing oxygen carriers includes a first component which is one or more of nickel oxide and nickel hydroxide and a second component which is one or more of boehmite, cerium oxide, cerium hydroxide, magnesium oxide, magnesium hydroxide, and titanium oxide, wherein, when the first component is nickel oxide, the second component includes cerium hydroxide. Such a raw material composition for producing oxygen carriers of the present invention is formed into oxygen carriers according to an oxygen carrier producing method, which will be described below, by adjusting the composition, formulation of raw materials, and degree of homogenization. Then, it is possible to produce oxygen carriers having physical properties such as a shape, a particle size, and a particle distribution suitable for a fluidized bed process or a high speed fluidized bed process and having improved wear-resistance, long-term durability, and oxygen transfer performance.

The invention discloses a metal organic friction repair agent and a preparation method thereof. The preparation method particularly comprises the following steps: adding isocaprylic acid and dimethyl benzene to a reaction kettle; uniformly stirring, then adding copper hydroxide, trihydroxy molybdenum and cerium hydroxide, continuously stirring, adding octyl butyl diphenylamine, heating to 70-150 DEG C for inert-gas protection reaction; and finally adding polyisobutylene succinimide, carrying out reduced pressure distillation, and recovering a solvent. The metal organic friction repair agent obtained through the preparation method disclosed by the invention has good oil solubility in various oil products, does not contain the elements, such as sulfur, phosphorus and halogen which are harmful to the environment, has good repair effect on abrasion marks, can be widely applied to repairing the abrasive surfaces in the fields of compressors, air cylinders, gears, precision machine tools, aerospace and the like and can prolong the service life of rotating equipment, reduce the equipment cost and achieve the purposes of electricity conservation and oil conservation.

The invention discloses environment-friendly plastic with high mechanical properties. The plastic comprises the following raw materials in parts by weight: 100 parts of polypropylene, 3-15 parts of maleic anhydride grafted polypropylene, 10-20 parts of an ethylene-propylene-diene monomer, 3-10 parts of polyvinyl butyral, 2-10 parts of a styrene-butadiene-styrene segmented copolymer, 5-15 parts of polybutyleneterephthalate, 3-15 parts of epoxy resin, 10-30 parts of boron nitride, 5-15 parts of a carbon nano-fiber, 2-12 parts of nanometer titanium dioxide, 3-10 parts of nano calcium carbonate, 3-10 parts of silicon carbide, 2-14 parts of hexagonal boron nitride, 2-5 parts of cerium hydroxide, 2-5 parts of magnesium stearate, 1-2 parts of vinyltrimethoxysilane, 1-3 parts of one or more lubricants and 1-2.5 parts of an anti-oxidant. The plastic provided by the invention is high in strength, impact resistance and corrosion resistance, excellent in environment-friendly property, and long in service life.

The invention discloses a preparation method for etching liquid for a thin film transistor. The etching liquid comprises the following compositions in percentage by weight: 0.5%-2.3% of cerium hydroxide, 0.2%-1.8% of o-chlorophenol, 1.2%-2.6% of isobutylglutaric acid, 1.2%-2.6% of hydrofluoric acid, 1.5%-2.3% of hydrogen fluoride, 2.5%-3.3% of a nonionic surfactant, 1.5%-2.6% of a de-foaming agentand the balance of distilled water. Cerium hydroxide, o-chlorophenol, isobutylglutaric acid, hydrofluoric acid and hydrogen fluoride are added on the basis of the original process, so that etching can be performed when penetration of an anti-corrosion coating does not occur, and etching speed of a chromium metal film is remarkably increased, and therefore, the preparation method has controllableetching speed, effectively inhibits degradation of an anti-corrosion protective layer, obtains a chromium metal film assembly line with a flat and smooth surface, and has an important application value.