31 results about "Alumina hydrate" patented technology

The invention relates to a corundum spinel castable with low thermal conductivity and high corrosion resistance and a preparation method thereof. According to the technical scheme, the preparation method comprises the following steps: firstly, taking 35.0 to 47.0 weight percent of recycled aluminum oxide ceramic, 25.0 to 34.0 weight percent of light-burned spinel aggregate, 13.0 to 19.0 weight percent of recycled zirconia corundum bricks, 6.0 to 9.0 weight percent of alpha aluminum oxide, 2.0 to 5.0 weight percent of fused magnesia and 1.5 to 4.5 weight percent of hydratable aluminum oxide as raw materials, adding 3.5 to 4.5 weight percent of binding agent and 0.05 to 0.08 weight percent of fiber, and uniformly mixing, so as to obtain the corundum spinel castable with low thermal conductivity and high corrosion resistance. The method has the characteristics of energy conservation, high efficiency, environment friendliness and low cost; the prepared corundum spinel castable with low thermal conductivity and high corrosion resistance is excellent in thermal shock resistance, high in mechanical strength and relatively high in use temperature.

The invention relates to an aluminum circulation method for metal aluminum energy storage and hydrogen production, and belongs to the technical field of aluminum material production. The method comprises the steps that aluminum oxide is fed into an electrolytic aluminum factory for electrolysis, and metal aluminum liquid is obtained; the metal aluminum liquid is processed, and the aluminum-based hydrogen production material with the large specific surface area is obtained; the method comprises the following steps: carrying out chemical reaction on an aluminum-based hydrogen production material and water under the action of a nitrogen-containing strong alkaline organic matter catalyst to obtain hydrogen and alumina hydrate slurry; performing solid-liquid separation on the alumina hydrate slurry to obtain alumina hydrate and an aqueous solution containing the catalyst; roasting the alumina hydrate to obtain high-activity metallurgical-grade alumina; the high-activity metallurgical-grade aluminum oxide is cyclically used for preparing metal aluminum liquid through electrolysis, and the aqueous solution containing the catalyst is cyclically used for hydrogen production through reaction of the aluminum-based hydrogen production material and water, so that a closed-loop cycle is formed. The defects of high energy consumption, high carbon emission intensity, high cost and the like in the metal aluminum preparation and aluminum recycling process are overcome.

Soil conditioning dispersible particles are disclosed that include at least one metal oxide domain and at least one nutrient domain. The at least one metal oxide domain and the at least one nutrient domain are present in the soil conditioning dispersible particle as different domains aggregated together. The soil conditioning dispersible particles are free of phosphorus. The invention further discloses soil conditioning dispersible particles. Wherein the at least one metal oxide domain comprises at least one metal oxide selected from the group consisting of alumina, alpha-alumina, beta-alumina, gamma-alumina, delta-alumina, bauxite, alumina trihydrate, alumina monohydrate, boehmite, pseudo-boehmite, gibbsite, diaspore, and combinations thereof, and at least one nutrient domain includes a nutrient selected from the group consisting of bioavailable substances: molybdenum, selenium, zinc, copper, cobalt, iron, nickel, manganese, vanadium, calcium, potassium, sulfur, chlorine, silicon, magnesium, sodium, nitrogen, boron, and combinations thereof.

The present application relates to the technical field of paint, and discloses a preparation method of a spherical alumina-cordierite composite refractory paint composition, wherein 100 parts by weight of epoxy resin, 1-5 parts by weight of an amino-terminated polymer ultraviolet absorber, 15-28 parts by weight of a filler spherical alumina trihydrate and cordierite, 29-32 parts by weight of a curing agent and the like are stirred and uniformly mixed to obtain the spherical alumina-cordierite composite refractory paint composition.The polymer ultraviolet absorber contains an ortho-hydroxybenzotriazole group, which can improve the ultraviolet absorption characteristics and ultraviolet aging resistance of the paint.The polymer, as an absorber, contains a biphenyl structure with thermal stability, which is beneficial to improving the thermal decomposition temperature, heat resistance and water resistance after being co-cured with the epoxy resin.The addition of the spherical alumina trihydrate and cordierite improves the limiting oxygen index of the paint coating and improves the flame-retardant fire resistance.

The present disclosure provides a sintered aluminum foil and a preparation method thereof, the preparation method comprising: performing a post-first aging on an initial sintered aluminum foil; performing a first heat treatment on the initial sintered aluminum foil; performing a microwave heating treatment on the initial sintered aluminum foil; and performing a post-second aging on the initial sintered aluminum foil. By performing the microwave heating treatment, the present disclosure can realize directional heating on the part of the sintered aluminum foil oxide film with high dielectric loss (i.e. the oxide film with high water content), thereby improving the heating efficiency, improving the depolarization effect, making the hydrated aluminum oxide film fully heat and dehydrate and performing crystal type conversion, obtaining an aluminum oxide film with higher dielectric constant, and avoiding the problem of defects in the traditional sintered aluminum foil due to the complex structure and the difficulty of the oxide film to fully crystallize and convert.

This technology is directed to a well-dispersed micronized pigment (carbon black and / or metal oxides such as iron oxide and zinc sulfide) which is added to Aristech's acrylic solid surface formulation at 0.5-5 wt % resulting in a solid surface with an enriched color and improved surface scratch appearance. The use of the micronized pigments helps surface scratches appear less white because of the improved coverage of white aluminum trihydrate (ATH).

A structure is manufactured by forming a mask that has an opening pattern on a surface of a substrate, etching the surface of the substrate with the mask to form a recessed portion corresponding to the opening pattern of the mask, forming a thin film including aluminum on a bottom surface of the recessed portion in a state where the mask remains, treating the thin film including aluminum with hot water to change the thin film into a fine recessed and projected layer including alumina hydrate smaller than the recessed portion, etching the bottom surface of the recessed portion, on which the fine recessed and projected layer is formed, in a state where the mask remains to form a fine recessed and projected structure on the bottom surface of the recessed portion, and thereafter removing the mask and the fine recessed and projected structure, which remains after the etching step.

Disclosed is a polycarbonate resin composition which does not generate a toxic gas at the time of combustion, complies with various kinds of regulations, and has high flame retardancy in consideration of the environment. The polycarbonate resin composition is characterized by comprising, relative to 100 parts by mass of a polycarbonate resin (A), 0.25-7 parts by mass of an alumina hydrate (B), 0.01-5 parts by mass of a non-phosphorus or non-halogen flame retardant (C), and 1-90 parts by mass of a filler (D). The polycarbonate resin composition is also characterized in that the mass ratio (B / D) of the content of the alumina hydrate (B) to the filler (D) is 0.005 to 0.11.

The invention discloses a fireproof flame-retardant cable, and relates to the field of power transmission and distribution line equipment. The preparation method comprises the following steps: performing ultrasonic radiation on organic bentonite to strip an interlayer structure, and then inserting rubber and acrylic acid into the interlayer structure of the bentonite in sequence to form a loose three-dimensional network structure. After mixing and adding phenyl phosphorus dichloride, cooking to generate an organic phosphorus flame-retardant compound and polymerizing. And then heating and drying bentonite to reduce the interplanar spacing, so that silicon oxide is generated, the structure is compact, the air contact surface is reduced, and the flame-retardant and fireproof effects are achieved. In addition, the composite bentonite and the alumina trihydrate are mixed as a filler to prepare the flame-retardant fireproof aerogel layer, the alumina trihydrate absorbs heat and is dehydrated when encountering high temperature, the temperature rise rate is slowed down, water is released to swell, the composite bentonite wraps, extends and is carbonized to prevent the combustible part from being in contact with combustion-supporting gas, and the flame-retardant effect is achieved. The cable prepared by the invention has fireproof and flame-retardant effects.

A method of producing a light transmissive member including a first film, a second film, and a third film includes: providing a light transmissive base member having a first surface, and a second surface opposite the first surface; forming a light transmissive aluminum oxide film covering at least part of the first surface and second surfaces, the light transmissive aluminum oxide film containing aluminum oxide having a crystallinity lower than a crystallinity of α-alumina; obtaining an intermediate structure by forming a light transmissive third film covering the aluminum oxide film on the second surface; and hydrating the intermediate structure such that the aluminum oxide film becomes the first film covering at least part of the first surface and containing hydrous alumina, and becomes the second film covering at least part of the second surface and containing the aluminum oxide having a crystallinity lower than the crystallinity of α-alumina.

The invention discloses a preparation method of polyhedral single crystal aluminum oxide, and relates to the technical field of preparation of inorganic functional powder materials. The method comprises the following steps: S1, providing polyhedral single crystal alpha-Al2O3 with D50 of 0.1-20 [mu] m; S2, uniformly mixing an alumina hydrate precursor with a composite mineralization system, wherein the composite mineralization system comprises one or more of halide, sulfate, borate, phosphate and low-eutectic molten salt thereof. According to the preparation method of the polyhedral single crystal aluminum oxide, a polyhedral alpha-Al2O3 seed with D50 of 5-100 microns, facet fidelity and high single crystal rate is obtained through epitaxial amplification of small-size polyhedral single crystal alpha-Al2O3 at 1250-1600 DEG C, and the seed has clear crystallographic orientation and regular geometric shape; the preparation method comprises the following steps: constructing a seed-precursor-mineralization composite material which is a morphology memory seed together with an alumina hydrate and a composite mineralization system, and carrying out temperature programming on the composite material to obtain powder;

The invention belongs to the field of preparation of aluminum oxide materials, and particularly relates to a preparation process of an aluminum oxide material, which comprises the following steps: S1, raw material preparation: crushing ore raw materials through crushing equipment until the particle size is less than 20MM, then grinding and dissolving out through a ball mill, adding a concentrated caustic soda solution (with the concentration of 200-300g / L), and reacting under the conditions of high temperature (140-250 DEG C) and high pressure (3-5MPa), so as to obtain an aluminum oxide material; the alumina hydrate in the bauxite reacts with NaOH to generate soluble sodium aluminate, the soluble sodium aluminate enters the solution and the red mud and is separated, and the dissolved slurry is settled and filtered. Raw materials with unqualified particle sizes can be ground, so that the quality of finished products is improved, subsequent use is facilitated, and meanwhile, by means of a back-flushing mode, the quality of the finished products is improved. And dust on the second filter screen can fall off, continuous use of the second filter screen is facilitated, the first filter screen can be prevented from being blocked through collision between the collision frame and the first filter screen, and the discharging efficiency is improved.

The application provides a high-purity, large-pore-volume and high-strength spherical alumina and a preparation method thereof. The method combines a micro-channel reactor and ultrasonic super dispersion, effectively controls the hydrolysis and polycondensation process of aluminum alkoxide through step-by-step hydrolysis, improves the related physical and chemical properties of the alumina hydrate intermediate product, and finally prepares the spherical alumina product with high purity, large pore volume, narrow pore size distribution and high strength through a hot oil column forming method, which can fully meet the requirements of the fluidized bed process on the alumina pellet carrier.

The invention discloses an electric heating layer insulation structure and a preparation method thereof, and relates to the technical field of electric heaters, the electric heating layer insulation structure comprises an aluminum plating layer arranged on the surface of an electric heating sheet, the surface of the aluminum plating layer is oxidized to form an aluminum oxide film, and the surface of the aluminum oxide film is provided with a closed coating layer. Or a hydrated alumina layer is formed on the surface of the aluminum oxide film through a hydration reaction. The preparation method comprises the following steps: performing sand blasting pretreatment on the surface of the electric heating sheet; an aluminum plating layer is formed on the surface of the electric heating sheet by adopting an electric arc spraying method or a metal aluminum plating process; carrying out oxidation treatment on the aluminum plating layer to form an aluminum oxide film on the surface; and sealing the aluminum oxide film by using a sealing coating to form a sealing coating layer, or carrying out hydration reaction on the surface of the aluminum oxide film to form a hydrated aluminum oxide layer on the surface of the aluminum oxide film. The heat transfer effect is improved, the corrosion resistance of the electric heating sheet is improved, a press machine is not used in the preparation process, and mechanical damage in the preparation process is avoided.

The present invention provides an improved fire resistant composite pole and a method for producing the same. In accordance with preferred embodiments, the composite utility pole of the present invention includes a composite structure having integrally bonded layers of resin impregnated fiberglass extending along the length of the pole. According to a preferred embodiment, the composite structure of the pole includes an intumescent layer which includes: high temperature mineral fibers, exfoliating graphite, organic binders. and alumina trihydrate (ATH).

The application relates to an alumina powder and a preparation method thereof, and the method comprises the following steps: stirring pseudo-boehmite, an acid solution and an ammonium salt to obtain an alumina sol; wherein the pseudo-boehmite has set crystallization parameters; aging the alumina sol, and then drying and crushing the alumina sol to obtain the alumina powder. The application selects the pseudo-boehmite with the set crystallization parameters as a main raw material to realize the characteristics of good peptization, fast peptization rate, high peptization rate and low peptization viscosity of the pseudo-boehmite, hydrogen ions in the acid solution are used to break the oxygen bridge bonds in the pseudo-boehmite to generate a sol body with alumina hydrate (Al2O3.xH2O) as a gel nucleus, and the ammonium salt is used to reduce the sol viscosity, increase the alumina content in the slurry, and then obtain the alumina powder through aging, drying and crushing. The powder can be dissolved in water to obtain a transparent or translucent sol, so that the technical problem of poor water solubility of the existing alumina product is solved.

Processes for reclaiming and recycling solid surface into a desired manufacturer's solid surface manufacturing process and methods used therein; specifically methods for identifying a manufacturing source of a test sample of solid surface comprising an acrylic polymeric matrix and alumina trihydrate (ATH), including generating a reference set of characteristics related to either (1) the percent area covered by the ATH particles, the ATH particle count, and the minor axis length of a best-fit ellipse to ATH particles, or (2) the aluminum, calcium, and zinc concentration in reference samples of solid surface from multiple known manufacturing sources, or some combination of (1) and (2); obtaining the test sample and non-destructively determining certain characteristics of the test sample; comparing those characteristics with the appropriate reference set; and identifying the manufacturing source of the test sample.

To provide a nickel-plated aluminum member (plated member) that is improved in uniformity and adhesion of plating, and can be manufactured in a dry method for preprocessing for plating.SOLUTION: There is provided a plated member that has a nickel plating film formed on aluminum base material made of aluminum or an aluminum alloy, and the plated member has: an aluminum member which has a hydrophilic primer layer including at least one kind of film consisting of a group of a hydrous oxide film including aluminum hydrous oxide and an oxide film including aluminum oxide, and a catalyst layer including a plating catalyst made of metal or metal oxide in this order on a surface of the aluminum base material; and a nickel plating film formed on the catalyst layer of the aluminum member, wherein the aluminum base material which has the hydrophilic primer layer formed on the surface has a surface roughness Rz of 2 to 15 μm.SELECTED DRAWING: Figure 1

The application relates to a preparation method of high-strength wear-resistant antibacterial stainless steel and belongs to the technical field of metal matrix composites, which comprises the following steps: preparing stainless steel powder with a particle size of 15-53 mu m, mixing the stainless steel powder with micron-grade SiC which has been subjected to surface modification treatment, wet-milling in a ball mill tank to obtain primary wet powder, and then drying to obtain completely dry primary powder; weighing equal mass of aluminum oxide monohydrate and aluminum hydroxide, mixing the two into an aqueous solution, then adding the primary powder, wet-milling in a ball mill tank to obtain secondary wet powder, and then drying to obtain completely dry secondary powder; roasting the secondary powder in a vacuum tube furnace to in-situ generate nano-aluminum oxide; and then pressure forming and vacuum sintering to obtain the target product. The micron-grade SiC particles and nano-grade Al2O3 particles are uniformly and dispersedly distributed in the stainless steel matrix, and the hardness and wear resistance of the antibacterial stainless steel are significantly improved.

The invention relates to the field of butyl rubber, and discloses a composition for preparing a halogen-free flame-retardant thermoplastic elastomer, the halogen-free flame-retardant thermoplastic elastomer as well as a preparation method and application of the halogen-free flame-retardant thermoplastic elastomer. The composition contains nitrile rubber, polypropylene, a vulcanizing agent, a flame retardant, a compatibilizer and an inorganic filler, wherein based on 100 parts by weight of the nitrile rubber, the content of the polypropylene is 20-80 parts by weight, the content of the vulcanizing agent is 0.05-2 parts by weight, the content of the flame retardant is 10-50 parts by weight, the content of the compatibilizer is 5-30 parts by weight, the content of the inorganic filler is 5-20 parts by weight, and the content of the flame retardant is 0.5-2 parts by weight. The flame retardant contains diammonium hydrogen phosphate, zinc borate, dicyandiamide and alumina trihydrate. The halogen-free flame-retardant thermoplastic elastomer prepared by using the composition of the halogen-free flame-retardant thermoplastic elastomer has high flame retardant property, mechanical property and oil resistance.

The invention relates to the technical field of electrical insulating materials, and discloses a super-hydrophobic nano-structure coating for an electrical insulator and a preparation method of the super-hydrophobic nano-structure coating. The static contact angle of the coating ranges from 117 degrees to 155 degrees, and the leakage current peak value is smaller than 60 mA. A material A for forming the coating contains modified nano silicon dioxide, polysiloxane and aluminum oxide trihydrate. The super-hydrophobic nano-structure coating provided by the invention has excellent super-hydrophobicity and electric leakage resistance, and can effectively reduce the risks of partial discharge, flashover and the like of an electric insulator in a polluted environment.

The application relates to an aluminum circulation method for aluminum energy storage and hydrogen production, and belongs to the technical field of aluminum material production. The method comprises the following steps: sending aluminum oxide to an aluminum electrolysis plant for electrolysis to obtain aluminum liquid; processing the aluminum liquid to obtain aluminum-based hydrogen production materials with a large specific surface area; under the action of a nitrogen-containing strong alkaline organic catalyst, chemically reacting the aluminum-based hydrogen production materials with water to obtain hydrogen and alumina hydrate slurry; performing solid-liquid separation on the alumina hydrate slurry to obtain alumina hydrate and a water solution containing the catalyst; calcining the alumina hydrate to obtain high-activity metallurgical-grade alumina; recycling the high-activity metallurgical-grade alumina for electrolysis to prepare aluminum liquid, and recycling the water solution containing the catalyst for hydrogen production by reacting the aluminum-based hydrogen production materials with water, so that a closed-loop circulation is formed. The application solves the defects of high energy consumption, high carbon emission intensity and high cost in the process of aluminum production and aluminum recycling.

The invention relates to a preparation method of alumina spinning gel, and belongs to the technical field of colloidal materials. According to the technical scheme, an inorganic aluminum source is adopted to replace a traditional organic aluminum source, and the reaction ratio of aluminum sulfate to sodium bicarbonate is controlled under a low-temperature condition, so that the alumina hydrate with high activity is synthesized; furthermore, the temperature, time and material proportion of carboxylation, polymerization and aging processes are accurately controlled, so that the aluminum carboxylate is self-polymerized to form high-viscosity high-polymerization-state aluminum carboxylate, and a thickening agent and a spinning auxiliary agent do not need to be additionally added, so that the process complexity is simplified while the alumina spinning gel performance is guaranteed, and the production cost is reduced. And finally, low-cost and high-performance preparation of the alumina spinning gel is realized.

Processes for reclaiming and recycling solid surface into a desired manufacturer's solid surface manufacturing process and methods used therein; specifically methods for identifying a manufacturing source of a test sample of solid surface comprising an acrylic polymeric matrix and alumina trihydrate (ATH), including generating a reference set of characteristics related to either (1) the percent area covered by the ATH particles, the ATH particle count, and the minor axis length of a best-fit ellipse to ATH particles, or (2) the aluminum, calcium, and zinc concentration in reference samples of solid surface from multiple known manufacturing sources, or some combination of (1) and (2); obtaining the test sample and non-destructively determining certain characteristics of the test sample; comparing those characteristics with the appropriate reference set; and identifying the manufacturing source of the test sample.

The invention provides a sintered aluminum foil and a preparation method thereof. The preparation method comprises the following steps: performing post-formation on an initial sintered aluminum foil; performing first heat treatment on the initial sintered aluminum foil; carrying out microwave heating treatment on the initial sintered aluminum foil; and carrying out secondary formation on the initial sintered aluminum foil. Through microwave heating treatment, directional heating can be carried out on the part with high dielectric loss (namely the oxidation film with high water content) in the sintered aluminum foil oxidation film, so that the heating efficiency is improved, the depolarization effect is improved, the hydrated alumina film fully absorbs heat, is dehydrated and is subjected to crystal form conversion, and the alumina film with a higher dielectric constant is obtained; the problem that defects exist due to the fact that a traditional sintered aluminum foil is complex in structure and an oxidation film is difficult to fully crystallize and convert is solved.

The present disclosure related to a silicone-based foam may include a component A and a component B, where the component A may include a silicone-based matrix component, a first filler component that may include alumina trihydrate, a second filler component that may include perlite, and a third filler component that may include calcium carbonate, and where the component B may include a silicone-based matrix component, a first filler component that may include alumina trihydrate, a second filler component that may include perlite, a third filler component that may include calcium carbonate, and a fourth filler component that may include zinc borate. The silicone-based foam may have a V-0 flammability rating as measured according to ASTM D3801.

Disclosed is a polycarbonate resin composition which does not generate a toxic gas at the time of combustion, complies with various kinds of regulations, and has high flame retardancy in consideration of the environment. The polycarbonate resin composition is characterized by comprising, relative to 100 parts by mass of a polycarbonate resin (A), 0.25-7 parts by mass of an alumina hydrate (B), 0.01-5 parts by mass of a non-phosphorus or non-halogen flame retardant (C), and 1-90 parts by mass of a filler (D). The polycarbonate resin composition is also characterized in that the mass ratio (B / D) of the content of the alumina hydrate (B) to the filler (D) is 0.005 to 0.11.

The application relates to a preparation method of an alumina spinning gel and belongs to the technical field of colloidal materials. According to the technical scheme, an inorganic aluminum source is used to replace a traditional organic aluminum source, and the reaction ratio of aluminum sulfate and sodium bicarbonate is controlled under low-temperature conditions to synthesize an alumina hydrate with high activity; further, the temperature, time and material ratio of a carboxylation, polymerization and aging process are accurately controlled to make aluminum carboxylate self-polymerize to form high-viscosity high-polymer aluminum carboxylate without additional addition of a thickening agent and a spinning aid, so that the performance of the alumina spinning gel is ensured, the process complexity is simplified, and finally the preparation of the alumina spinning gel with low cost and high performance is realized.

Processes for reclaiming and recycling solid surface into a desired manufacturer's solid surface manufacturing process and methods used therein; specifically methods for identifying a manufacturing source of a test sample of solid surface comprising an acrylic polymeric matrix and alumina trihydrate (ATH), including generating a reference set of characteristics related to either (1) the percent area covered by the ATH particles, the ATH particle count, and the minor axis length of a best-fit ellipse to ATH particles, or (2) the aluminum, calcium, and zinc concentration in reference samples of solid surface from multiple known manufacturing sources, or some combination of (1) and (2); obtaining the test sample and non-destructively determining certain characteristics of the test sample; comparing those characteristics with the appropriate reference set; and identifying the manufacturing source of the test sample.

The present invention relates to a composition comprising alumina trihydrate, an ester functionalized trialkoxysilane, and a polysiloxane. The composition of the present invention can be used as a thermally conductive composite material having desired viscosity and thermal conductivity.