308 results about "Photocatalytic coating" patented technology

A tungsten oxide/titanium dioxide photocatalyst coating oxidizes contaminants in the air that adsorb onto the coating into water, carbon dioxide, and other substances. The tungsten oxide forms a monolayer on the titanium dioxide. When photons of the ultraviolet light are absorbed by the tungsten oxide/titanium dioxide photocatalyst coating, an electron is promoted from the valence band to the conduction band, producing a hole in the valence band. The holes in the valence band react with water applied on the tungsten oxide/titanium dioxide photocatalyst coating, forming reactive hydroxyl radicals. When a contaminant in the air is adsorbed onto the tungsten oxide/titanium dioxide photocatalyst, the hydroxyl radical attacks the contaminant, abstracting a hydrogen atom from the contaminant. The hydroxyl radical oxidizes the contaminant, producing water, carbon dioxide, and other substances. The tungsten oxide/titanium dioxide photocatalytic coating has low sensitivity to humidity variations.

This invention is intended to provide a photocatalytic coating material which includes: at least (a) photocatalytic oxide particles; (b) a hydrophobic-resin emulsion; and (c) water, wherein the average particle size of the photocatalytic oxide particles is smaller than that of the particles dispersed in the hydrophobic-resin emulsion. This invention is also intended to provide a self-cleaning water-base coating composition which includes: (a) water-based silicone emulsion or the like; (b) photocatalytic particles or a photocatalytic sol; and (c) water, wherein the solid matter of the ingredient (b) constitutes less than 5% by weight of the total solid matter of the coating composition. This invention is also intended to provide a self-cleaning water-base coating composition which includes: (a) water-based silicone emulsion or the like; (b) whisker or the like; (c) photocatalytic particles; (d) an inorganic coloring pigment; and (e) water.

Certain example embodiments of this invention relate to a photocatalytic coated article and a method of making the same. In certain example embodiments, a coated article includes a zirconium nitride and/or oxide inclusive layer before heat treatment (HT). The coated article is heat treated so that following heat treatment (e.g., thermal tempering) a zirconium oxide based layer is provided. A photocatalytic layer (e.g., of an oxide of titanium) may be formed over zirconium oxide based layer following heat treatment.

Titanium oxide-based photocatalysts which contain a metal halide in titanium oxide and which are prepared from titanium oxide and/or its precursor, which may optionally be heat treated, by contact with a reactive gas containing a metal halide of the formula MX_n or MOX_n (wherein M=a metal, X=a halogen, and n=an integer) with heating stably develop a high photocatalytic activity with visible light irradiation. The photocatalysts may subsequently be stabilized by contact with water or by heat treatment, and/or promoted by contact with a heteropoly acid and/or an isopoly acid so as to include a metal complex in the titanium oxide. Photocatalysts prepared in this manner exhibit novel ESR features. The present invention also provides methods for preparing these photocatalysts, a photocatalyst dispersion and a photocatalytic coating fluid containing such a photocatalyst, and photocatalytic functional products and methods for their manufacture using the photocatalyst.

In one aspect, the present invention is directed to a coating composition. The coating composition comprises a dispersion of photocatalysts having a mean cluster size of less than about 300 nm and an alkali metal silicate binder. In another aspect, the present invention is directed to a coated article. The coated article has a photocatalytic coating with improved transparency on its external surface that is formed from the aforesaid coating composition.

Disclosed herein is a photocatalytic coating composition that enables control of refractive index, film density and hydrophilicity and gives a film with improved strength and adhesion. The photocatalytic coating composition comprises: (1) an alkali silicate aqueous solution having: (A) a molar ratio of silicon to an alkali (SiO2/(A2O+B) (A: alkali metal, B: NH3)) in the range of 4 to 30; and (B) a silicon concentration in terms of oxide (SiO2 concentration) in the range of 6.8 to 30% by weight; and (2) a photocatalytic compound.

A lamp including a reflective portion is utilized in a fluid purification system to maximize the light delivery to a photocatalytic coating that oxidizes gaseous contaminants that adsorb onto the surface to form carbon dioxide, water, and other substances. An ultraviolet light source positioned proximate to the honeycomb activates the titanium dioxide coating. In one example, the reflective portion is a reflective coating. Light directed out of the non-reflective portion of the lamp travels towards the honeycomb and absorbs onto the photocatalytic coating. Light directed towards the reflective portion on the lamp is reflected off the surface of the reflective portion and passes through the non-reflective portion of the lamp to also absorb onto the photocatalytic coating. The reflective portion reflects light towards the honeycomb that would otherwise be misdirected away from the honeycomb, increasing efficiency of the fluid purification system.

Bioreactor having at least one transparent window (5, 12, 13), the inner side (6) of which can be touched by a medium that can be arranged in a reactor interior (3), wherein the window (5, 12, 13) has a photocatalytic coating (7) on its inner side (6) facing the reactor interior (3), which coating can be activated by at least one light source from the outer side remote from the inner side (6).

A photocatalytic coating composition comprising a photocatalyst, a silicon alkoxide, a zirconium compound, colloidal silica, and a liquid medium, wherein a content of the zirconium compound in terms of zirconium atoms is 0.3 to 3 times by mole a content of the silicon alkoxide in terms of silicon atoms, which can form a coating film of a photocatalyst with a high adhesion strength to a substrate.

The invention discloses a composite nonwoven material and a preparation method thereof. The composite nonwoven material disclosed by the invention comprises at least two PP spun-bonded nonwoven material layers and a PA6 or PA66 electrostatic spinning nanofiber material layer sandwiched between the two PP spun-bonded nonwoven material layers, wherein an ultraviolet light absorber and an antibacterial agent are uniformly absorbed to the surface of the composite nonwoven material; and in the two PP spun-bonded nonwoven material layers between which the PA6 or PA66 electrostatic spinning nanofiber material layer is sandwiched, the surface of at least one PP spun-bonded nonwoven material layer is coated with a nanometer titania photocatalytic coating. The composite nonwoven material disclosed by the invention is high in strength and low in fiber fineness and has the advantages of high porosity, high specific surface area, excellent barrier property, excellent gas permeability, aging resistance and antibacterial property. Compared with a blended nonwoven material, the composite nonwoven material disclosed by the invention has the advantages that the production and quality defects caused by the reason that the additives are non-uniformly mixed or separated out are overcome; and moreover, the preparation method is simple, and only general nonwoven material production equipment needs to be adopted.

The invention relates to a method for preparing air auto-purification functional fabrics with a photocatalyzed coating, which comprises the following steps: firstly, a base cloth is subjected to surface treatment by an organic solution at a temperature of between 60 and 70 DEG C; secondly, deionized water, methanol and ether are taken as dispersing reagent of a fiber protecting agent, the pH value of the dispersing protecting agent is adjusted to between 9.5 and 11.5 by ammonia, and the base cloth is immersed in the dispersing protecting agent for more than 6 to 8 hours at a temperature of between 30 and 40 DEG C; thirdly, the base cloth is treated for 10 to 15 minutes by an ethylenediaminetetraacetic acid and a phytate aqueous solution; and fourthly, photocatalyst is added in a coating agent, and the coating agent is then directly coated on the base cloth by a scraper with the coating amount between 6 and 15 grams per square meter, and dried for 2 to 4 minutes at a temperature of between 110 and 120 DEG C to obtain the air auto-purification functional fabrics. The air auto-purification functional fabrics have good air purification effect; the preparation technology is simple; and the method is easy to operate and is used for industrial mass production.

A photocatalyst-coated body and a photocatalytic coating liquid which exert an excellent weather resistance, harmful gas decomposability, and other desired characteristics (such as transparency and film strength), while preventing erosion of the substrate are provided. The photocatalyst-coated body comprises a substrate and a photocatalytic layer provided on the substrate. The photocatalytic layer comprises photocatalytic particles and inorganic oxide particles, and has interstices between the particles in the layer.

Disclosed is a photocatalytic coating sol composition and the method for preparing the same. The photocatalityc coating sol composition comprising 0.1% to 20% by weight of a photo-catalyst, 0.1% to 10% by weight of an inorganic adsorbent, 1% to 20% by weight of an inorganic binder, 55% to 95% by weight of an organic solvent and if necessary 0.1% by weight to 10% by weight of a metal compound. Specifically, the present invention can remove harmful substances by coating photocatalytic coating sol composition prepared from photocatalyst, inorganic adsorbent, inorganic binder, metal compound and organic solvent on metal filter such as aluminum etc., and plastic filter such as polyethylene and polypropylene etc. used in environmental contaminants treatment system or air conditioning plant such as air-conditioner and air-cleaner, according to any one of and ordinary coating techniques such as spray method or dipping method etc. at room temperature.

A layered heterostructured coating has functional characteristics that enable the controlled release of volatile agents. The coating has photocatalytic properties, since it uses titanium dioxide, its derivatives or materials with similar photocatalytic properties (2), which upon solar irradiation open and/or degrade nano or microcapsules (3) and subsequently releases in a controlled form the volatile agents contained in them.

The invention discloses a preparation method of nano-photocatalytic admixture for cement-based material, comprising the following steps: nanometer titanium dioxide mixed crystal is mixed with active carbon according to the weight ratio of 1:1-2 for 1-2 hours to obtain nano-photocatalytic material loaded with active carbon; then, the nano-photocatalytic material loaded with active carbon, dispersible emulsion powder, water reducer and polypropylene fiber are mixed according to the weight ratio of 1:0.2-0.3:0.04-0.06:0.004-0.006 for 1-2 hours. The invention has simple preparation technology, and prepared nano-photocatalytic admixture for cement-based material has long-term and stable photocatalytic function, and can improve flow property, adhesive property and anti-cracking property of concrete. The nano-photocatalytic admixture not only can be mixed with cement to obtain photocatalytic cement paste which is cement-based photocatalytic paint convenient to paint, but also can be mixed with cement and sand to prepare cement mortar to form cement-based photocatalytic coating with certain thickness on the concrete surface.

Photocatalytic coating compositions contain a photocatalytic material such as obtained by doping nitrogen atoms to an interstitial site of metal oxide crystals, a titanium compound having a specific structure, an organosilane hydrolysate having a specific structure, and an organosiloxane oligomer having a specific structure. The photocatalytic coating compositions can give coating films that exhibit adequate photocatalytic action even in an environment with less spectral components having wavelengths of 400 nm or below and more visible light, for example in an indoor environment and in vehicle interiors having UV protection glass, and that have high transparency. Further, the photocatalytic coating compositions have good storage stability of dispersions.

The invention relates to a method and compositions for producing a hydrophilic coating on a surface of a solid material. The method comprises a cleaning step and a coating step. The cleaning step may be preceded by an initial cleaning step and it may optionally be succeeded by a preconditioning step prior to the coating step. The cleaning step comprises cleaning and preconditioning a surface of a material by use of a first cleaning fluid composition comprising ceria (CeO₂) particles. The coating step comprises treatment by use of a coating fluid composition comprising photocatalytically active nanoparticles of titania (TiO₂). An advantage of the method of the invention is that the method may be carried out at temperatures in the range 5 to 50° C. No further heating is required. Thereby, the method may easily be used for treating materials such as windows, furniture, tiles, walls, etc.

The preparation method of ceramic coating layer uses ceramic powder as raw material, specially, uses titanium oxide block body power or titanium oxide agglomeration powder as raw material, and adoptsthe cold spray-coating process to deposit titanium dioxide coating layer on the base body. The TiO2 coating layer prepared according to said ivnentino can be formed into coating layer under the condition of less than 600 deg.c, and the structure and performance of original powder can be better transferred into the coating layer, specially, in the preparation of nano structure coating and high-performance light-catalytic coating it has obvious superiority.

The invention relates to luminescent photocatalytic coating and a preparation method thereof. The luminescent photocatalytic coating is novel coating capable of removing the lampblack and the odor. The luminescent photocatalytic coating comprises inorganic coating base basically with dispersed nanoscale photocatalytic titanium dioxide nanotube and rare-earth long-acting noctilucence powder. The luminescent photocatalytic coating comprises the following components: 25 to 65 percent of photocatalytic titanium dioxide nanotube, 5 to 10 percent of long-acting rare-earth noctilucence powder, 15 to 25 percent of pigments, 3 to 5 percent of self-dissolving agent, 2 to 15 percent of dispersing agent, 2 to 5 percent of anti-foaming agent, 1 to 3 percent of sterilizing agent and 3 to 5 percent of calcium carbonate. The photocatalytic titanium dioxide nanotube is prepared in a novel hydrothermal synthesis method, the diameter of the photocatalytic titanium dioxide nanotube is about 5nm to 15nm, the length of the photocatalytic titanium dioxide nanotube is about 100nm, and by adopting the coating, pollutants such as lampblack and harmful gas of NOX compound in the air of a kitchen and a toilet can be resisted. The luminescent photocatalytic coating not only can work at daytime, but also can react at night, and the efficiency of the nano material for purifying the air can be improved.