44 results about "Aluminum oxide hydroxide" patented technology

Surface-modified nanoparticles of boehmite, and methods for preparing the same. Aluminum oxyhydroxide nanoparticles are surface modified by reaction with selected amounts of organic acids. In particular, the nanoparticle surface is modified by reactions with two or more different carboxylic acids, at least one of which is an organic carboxylic acid. The product is a surface modified boehmite nanoparticle that has an inorganic aluminum oxyhydroxide core, or part aluminum oxyhydroxide core and a surface-bonded organic shell. Organic carboxylic acids of this invention contain at least one carboxylic acid group and one carbon-hydrogen bond. One embodiment of this invention provides boehmite nanoparticles that have been surface modified with two or more acids one of which additional carries at least one reactive functional group. Another embodiment of this invention provides boehmite nanoparticles that have been surface modified with multiple acids one of which has molecular weight or average molecular weight greater than or equal to 500 Daltons. Yet, another embodiment of this invention provides boehmite nanoparticles that are surface modified with two or more acids one of which is hydrophobic in nature and has solubility in water of less than 15 by weight. The products of the methods of this invention have specific useful properties when used in mixture with liquids, as filler in solids, or as stand-alone entities.

A textile substrate is provided which is coated with a film comprising iron (III) oxide hydroxide and aluminum oxide hydroxide. This film or coating is formed by contacting the textile substrate with an aqueous solution comprising ferrous or ferric salts and aluminum salts. The iron (II), iron (III), and aluminum ions are hydrolyzed and the iron (II) ions are also oxidized under controlled conditions. These hydrolyzed species then, it is believed, coprecipitate or copolymerized to on the textile surface to form a smooth, coherent, substantially amorphous iron (III) oxide/aluminum oxide hydroxide film or coating on the surface of the substrate without forming an insoluble iron (III) or aluminum hydroxide precipitate in the solution. This is accomplished by controlling the reaction conditions such that the rates of adsorption onto the substrate surface of both iron (III) and aluminum oxide hydroxides are greater than the rates of formation of said same oxide hydroxide particles. The resultant coating is substantially amorphous with extremely limited crystalline formation. The obtained substrate has very good color fastness, bacteriostatic, and virus removing properties and can be utilized as an inexpensive and effective water filtration article.

A hydrolytic stabilizer mixture is disclosed. The mixture comprise i) at least one carbodiimide and ii) co-stabilizer selected from the group consisting of aluminum oxide and aluminum oxyhydroxide. The mixture is useful in imparting to polymeric systems improved resistance to hydrolysis.

The present invention is a process for the conversion of aluminum oxide hydroxide (AlOOH) to aluminum oxide. About 30 to 70 wt-% of AlOOH, about 30 to 70 wt-% ammonium hydrogencarbonate NH₄HCO₃ and 0 to 20 wt-% water are combined to produce a mixture. This mixture is then cured at a temperature from about 30° to about 90° C. to convert at least 5% of the AlOOH to a ammonium hydroxycarbonate (dawsonite-type) intermediate and then the dawsonite-type intermediate is decomposed at a temperature from about 130° to 320° C. to produce aluminum oxide. The aluminum oxide can be further calcined at 500° to 800° C. to produce a gamma-theta phase alumina.

A rheology modified aqueous fluid composition comprising clay, water, magnesium oxide, aluminum oxide hydroxide, sodium carbonate or potassium carbonate, and calcium oxide or calcium hydroxide. The magnesium oxide and aluminum oxide hydroxide are prepared by a specific thermal treatment protocol involving heating of appropriate precursors within a specified temperature range. The pH of the composition is at least about 10. The composition is prepared by admixing the components and, optionally, sodium oxide or sodium hydroxide for pH adjustment as necessary. A substantially dry rheology modification agent comprising the enumerated components, not including the water, is also included. The resulting composition preferably exhibits shear-thinning capability including very rapid thinning upon application of shear forces and also rapid viscosification upon removal of such forces.

A method is disclosed for treating an anodized metal surface. According to the method, polynuclear clusters comprising aluminum oxide hydroxide are applied to the anodized metal surface.

The invention discloses a preparation method of a resin matrix composite material toughened by a nano-scale aluminum oxide hydroxide sheet material, and belongs to the technical field of high performance of composite materials. The method comprises the steps that aluminum nitrate powder, carbamide powder and deionized water are mixed, stirred and transferred into an oil bath, and a mixing solution is obtained; sealing is performed under the temperature of 160 DEG C for 24 h, and a paste is obtained; the paste is washed and filtered in a decompression mode till a filtrate is neutral, and a filter cake is obtained; ethyl alcohol is used for washing, and finally the obtained filter cake is dispersed into ethyl alcohol again for use; dried nano-scale aluminum oxide hydroxide sheet powder m-phenylenediamine crystals are placed into an acetone solvent, and a mixed solvent is obtained; the mixed solvent is added into epoxy resin, and uniform stirring is performed to obtain a glue solution containing the nano-scale aluminum oxide hydroxide sheet material. The nano-scale aluminum oxide hydroxide sheet material is prepared through the simple and low-cost method, the nanometer material is added into the carbon fiber/epoxy composite material, the composite material is toughened, and the interlaminar fracture toughness of the composite material is greatly improved.

The invention discloses morphology-controllable hollow aluminum oxide microspheres as well as a preparation method and application thereof, and belongs to the technical field of inorganic synthetic materials. The preparation comprises the following steps: adding soluble aluminum salt, urea and a dispersing agent into a medium, wherein the used soluble aluminum salt is Al2(SO4)3, Al(NO3)3, AlCl3 and the like; and carrying out hydrothermal treatment to obtain a hydroxyl alumina precursor, and washing, freeze-drying and calcining the precursor to obtain the hollow Al2O3 microspheres. By adoptingthe scheme, the morphology-controllable hollow aluminum oxide microspheres can be obtained, and the obtained product can be applied to the fields of soil remediation, sewage treatment, cosmetics, coatings and the like.

The invention discloses a preparation method of a rice-grain-shaped hydroxyl alumina nano-material with good suspension stability, the method uses a mixed solution of inorganic aluminum salt and urea as a reactant, a nano-sized hydroxyl alumina adjuvant is prepared through a hydrothermal method, and the prepared hydroxyl alumina adjuvant nano-material has the advantages of uniform morphology, uniform dispersion, and good homogeneity and immunogenicity. Compared with the existing commercial hydroxyl aluminum oxide adjuvant, the rice-grain-shaped hydroxyl aluminum oxide adjuvant has outstanding and excellent suspension stability, and has a good prospect in vaccine preparation, production and application.

The invention relates to a diatomite-based hierarchical porous composite humidity-controlling material and a preparation method thereof, diatomite is used as a silicon source and a carrier, a partial alkali dissolution-hydrothermal forming method is adopted, the diatomite and sodium hydroxide are subjected to alkali dissolution for 10-40 min at the temperature of 50-80 DEG C according to the mass ratio of 1.5-3.5, and mixed ore pulp of sodium silicate and diatomite is prepared; and an oxalic acid solution with the mass fraction of 30%-60% and low corrosivity is added into the mixed ore pulp, acidification is carried out to generate white carbon black, crystalline aluminum chloride and sodium hydroxide are added according to the molar ratio of 1: 3-1: 1, aging is carried out for 30-150 minutes, uniformly stirring is carried out, a mixture is transferred into a reaction kettle, hydrothermal reaction is carried out for 6-12 hours at the temperature of 100-150 DEG C, and then filtering, washing and drying are carried out. The main components of the material are amorphous silicon dioxide and hydroxyl aluminum oxide; the nitrogen adsorption specific surface area is 110 m < 2 >/g, the pore volume is 0.15 cm < 3 >/g, and the average pore size is 10-40 nm; under the environment temperature of 10-30 DEG C and the relative humidity of 95% and 85%, the maximum moisture absorption capacities respectively reach 25% and 20% or above; and under the environment temperature of 10-30 DEG C and the relative humidity of 45% and 35%, the maximum moisture liberation amount reachesmore than 15% and 10%, which are improved by more than 3 times compared with the diatomite, so that the material has a good application prospect.