40results about How to "Fine pore size" patented technology

The present invention relates to a protection device for use in a lumen of a patient's body. The protection device has a fiber matrix electrospun about an expandable and collapsible wire frame. In the collapsed configuration the protection device may be advanced within a lumen. In the expanded configuration, the protection device is able to engage the walls of the lumen wherein, the fiber matrix forms a plurality of pores for preventing the passage of particulate material and allow fluid to flow through.

The nonwoven fabric sheet of the present invention is characterized by a porosity in the range of 0.3 to 0.7 and an average pore size in the range of 0.5 μm to 5.0 μm. The nonwoven fabric sheet of the present invention preferably has a maximum pore size (μm)/average pore size (μm) ratio of 1.30 or lower. The nonwoven fabric sheet of the present invention is obtained by press-molding a nonwoven fabric at a temperature lower than the melting point of the thermoplastic resin which constitutes the nonwoven fabric sheet. According to the present invention, there is provided a nonwoven fabric sheet that has a high porosity, small uniform pore sizes and excellent productivity, which can suitably be used in various applications such as filters, light diffusing material, liquid absorber and heat insulating materials; and a method for producing the nonwoven fabric sheet.

The invention relates to compositions that can be used to adsorb low concentration, preferably, for example less than 15 ppm, of unwanted or target substances. Typically the absorbance can be from an enclosed vapor phase. Such absorbency is accomplished in a contained substantially enclosed gaseous volume or atmosphere using a composition comprising a cyclodextrin compound and a polyethylenimine that can have an absorbency capability for low concentrations of unwanted or target substances. Such absorbency can be obtained with thermoplastic materials used in the form of bulk polymer or a film, fiber, web, woven fabric, nonwoven fabric, sheet, packaging and other such structures including or surrounding the enclosed volume. The adsorbent of the invention is typically used in the context of an enclosed volume, also known as an enclosed ambient vapor phase that contains the adsorbent of the invention and the unwanted or target substances at a concentration that is not desirable. The concentration should be reduced to non-offensive sensed limits or a limit that does not produce a biological response.

The invention relates to a preparation method of an optical relievo illusion glazed brick, which comprises the following steps: A. preparation of special basic glaze powder; B. preparation of special fancy glaze material; C. preparation of special fancy glaze printing glaze; D. special fancy glaze printing; and E. product firing system. By optimizing the compositions of the special basic glaze powder, special fancy glaze material, printing oil and special fancy glaze printing glaze as well as the firing technique and the like, optimized special rubber rollers or printing silk screen plate with optimized meshes can be used for printing the special fancy glaze on the base glaze, surface glaze and common fancy glaze green body, and the green body is fired at high temperature, so that the special fancy glaze pattern sinks into the common surface glaze and fancy glaze. The obtained product does not have the special fancy glaze pattern when viewed from the front side, but has the clear delicate pattern with relievo illusion effect when viewed from the lateral side, thereby achieving the dreamy illusion effect. The special fancy glaze has favorable transparency, does not destroy the original decorative pattern, and overcomes the defect of single decorative style in the existing glazed brick.

A method for treating ischaemic tissue comprising cutting the tissue to form a wound, and locating a sponge-like element (1) structured to receive blood and to comply with the movement of the tissue, in contact with a source of blood whereby the element (1) receives blood from the source of blood to thereby promote tissue growth and angiogenesis throughout and beyond the element (1).

Silicone-in-water emulsions and methods for reducing the appearance of lines, wrinkles and the size of pores in the skin are provided. The emulsions comprise at least one silicone, comprising at least one silicone elastomer, a silica, a film forming cosmetic patch component, and water.

This invention presents a metal-doped zeolite membrane-based apparatus containing molecular sieving zeolite thin film on the seeded porous substrate. The metal-doped zeolite membrane exhibits high selectivity to olefin over paraffins. The membrane is synthesized by seed coating and secondary growth method, followed by metal doping and post treatment processes.

The present invention discloses an electrochemical process for water splitting for production of oxygen using porous Co₃O₄ nanorods with a considerably low overpotential and high exchange current density. The present invention further discloses a simple, industrially feasible process of for preparation of said nanostructured porous cobalt oxide catalyst thereof.

A water transport plate is provided with optimized physical characteristics to greatly improve fuel cell operation. In a preferred method of manufacturing, graphite powder, reinforcing fibers, cellulosic fibers, and a thermosetting resin are mixed with a liquid to form a slurry and showered onto a screen to form a planar sheet which is dried to form paper. The paper is cut into the desired size and is laid-up. The lay-up is laminated with pressure and heat, carbonized, and graphitized to form a water transport plate for later machining as desired. The finished water transport plate exhibits optimal physical characteristics for bubble pressure, water permeability, median pore size, porosity, thru-plane resistivity and compressive yield strength.

The invention belongs to the technical field of a process for a cat litter, and specifically relates to a fragrant sterilizing-type pea-hull composite cat litter and a preparation method thereof. According to the invention, pea hulls are capable of emitting slightly sweet and fragrant smells in the process of processing, so the prepared cat litter by the invention has pea-hull fragrance, low density and good water absorptivity, bulkiness, antibacterial properties and adsorption properties, is biodegradable, green and environmentally friendly, and effectively improves the living environment of a cat; meanwhile, regularly-cleaned cat litter is poured into soil and can play the role of improving soil, and the regularly-cleaned cat litter contains animal manure, thereby being able to be used as an organic fertilizer, so resources are saved. The preparation method provided by the invention has the following advantages: through mutual compounding effects of the pea hulls with filled-type wood, an antibacterial agent, sodium bicarbonate and a binder, and by adopting a vertical-type ring die granulating machine, the prepared cat litter has uniform particle size, small pore size and good bulkiness; strong adsorption of the cat litter to manure odor is guaranteed; meanwhile, the yield is large; and production efficiency is improved.

The invention discloses bio-based aromatic hydrocarbon polyester polyol for controlled-release fertilizer. The bio-based aromatic hydrocarbon polyester polyol is characterized by being synthesized according to a method comprising the following steps: sucking fatty acid (1mol), diethylene glycol (2mol), glycerol (2mol) and the like into a reaction kettle in vacuum according to a sequence; adding terephthalic acid (3mol), phthalic anhydride (2mol) and trimethylol propane (2mol) from a solid feeding hole in the reaction kettle; after stirring in the reaction kettle for 1h, displacing air in the reaction kettle once with nitrogen gas; slowly raising the temperature of the reaction kettle to 180 DEG C to 240 DEG C, carrying out esterification reaction to distill water and maintaining the temperature for 4h; when the temperature of the top of an esterification tower is lower than about 95 DEG C and no water is discharged, sampling and testing an acid value; when the acid value is less than 15mgKOH/g, supplementing a catalyst Tio2/SO4-2 solid super acid which accounts for 0.03 percent of the total amount; continually keeping heat and reacting for 1h; then carrying out vacuum extraction for about 2h and controlling the vacuum degree to be -0.085mPa to -0.095mPa; when the acid value is less than 2mgKOH/g, the reaction is completed; then cooling and filtering and packaging to obtain a bio-based aromatic hydrocarbon polyester polyol finished product.

The invention relates to a tubular film based on a nuclear track film and application. The tubular film based on the nuclear track film comprises a composite material, the composite material is woundto form a tubular structure and comprises a supporting layer and a nuclear track film layer, the nuclear track film layer is compounded on the outer side or the inner side and the outer side of the supporting layer in a hot pressing mode, pore channels playing a screening role are distributed in the nuclear track film layer, the inner diameter of the channels is larger than 2 mm, and the thicknessof the channel wall is larger than or equal to 10 micrometers. Through hot-pressing compounding, the nuclear track film is successfully applied to the tubular film, the length of the tubular film isnot limited, the minimum pore diameter of the tubular film can reach 0.01 mm, the filtering precision of the tubular film is improved, the bearing pressure value is larger, and the engineering application range is wide. According to the invention, the types of tubular film materials are broadened, the tubular film adopts a new material, the physical and chemical properties of the tubular film areimproved, and a solution is provided for the engineering application of the nuclear track film.

The invention discloses a porous filtration film. The porous filtration film comprises the following raw materials in parts by weight: 20-40 parts of polyvinyl chloride, 15-30 parts of vinyl acetate, 5-10 parts of porous fibers, 10-30 parts of an organic solvent, 1-5 parts of a heat stabilizer and 1-3 parts of a surfactant. A preparation method of the porous filtration film comprises the following steps: adding the polyvinyl chloride, the vinyl acetate and the porous fibers into the organic solvent according to the parts by weight, simultaneously and uniformly mixing, stirring, adding the heat stabilizer and the surfactant, continuously stirring so as to obtain a spraying film slurry solution, and coagulating the spraying film to obtain a finished product. The preparation method of the porous filtration film is simple in process and convenient to operate; and the prepared porous filtration film is small in aperture, large in number and high in filtration efficiency.

The invention relates to a tubular membrane based on a nuclear pore membrane as well as a preparation method and application of the tubular membrane. The tubular membrane based on the nuclear pore membrane comprises a composite material, the composite material is rolled into a cylindrical pipe membrane according to an acute angle, and overlapping parts are welded and sealed through ultrasonic waves. The composite material comprises a supporting layer and a nuclear pore membrane layer, wherein the nuclear pore membrane layer is compounded on the inner side and/or the outer side of the supporting layer in a hot pressing mode, pore channels playing a role in screening are distributed in the nuclear pore membrane layer, the inner diameter of the pipe is larger than 2 mm, and the thickness of the pipe wall is larger than or equal to 10 micrometers. Through hot-pressing compounding, the nuclear pore membrane is successfully applied to the tubular membrane, the length of the tubular membraneis not limited, the minimum pore diameter of the tubular membrane can reach 0.01 mm, the filtering precision of the tubular membrane is improved, the bearing pressure value is larger, and the engineering application range is wide. According to the invention, the tubular membrane material variety and the preparation process are broadened, the tubular membrane adopts a new material, the physical andchemical properties of the tubular membrane are improved, and a solution is provided for the engineering application of the nuclear pore membrane.

The invention belongs to the technical field of cat litter technology and in particular relates to a fragrant degerming pea wood composite cat litter and a preparation method for the same. Pea wood can give out weak fragrant smell during the processing, so the cat litter made of the pea wood is fragrant and has low density, great water absorbing capacity, filling power, bacteria resistance and absorbing ability; and the cat litter can be biodegraded, thereby being green and environment-protective, so lift environment of cats can be effectively improved; cat litters can be regularly cast into soil, so soil can be improved; containing animal waste, the cat litter can work as organic fertilizer, so resource can be saved. In the preparation method, pea wood is matched with filling wood material, antibacterial agent, sodium bicarbonate and binders; a vertical circular mold granulator is applied, so particle size of cat litter particles is even and fine; great fluffiness can be achieved, so the cat litter has great absorbing capacity for excrement odor; and great yield can be provided, and production efficiency can be improved.

A lightweight gypsum compositions gypsum composition with good water resistance having a low water-to-stucco ratio, high flowability, and mechanical strength. The gypsum composition includes a cationic agent, an anionic agent, an aqueous stucco slurry containing a stucco, a water reducing dispersant, and water. The cationic agent may operate as a foaming agent, and the anionic agent may operate as a foam stabilizer.

The invention discloses a preparation method of a graphene composite PP filter membrane. The preparation method comprises the following steps: firstly, grafting and compounding graphene and polypropylene to prepare graphene composite PP master batch, then adding the master batch and an additive into a polypropylene melt extruder to prepare a graphene composite PP single-layer membrane, and superposing and hot-pressing the membranes to prepare the graphene composite PP filter membrane. Compared with a common membrane, the graphene composite PP membrane has the advantages that the pore diameteris small, the adsorption performance is just good, impurities in water can be effectively blocked, and a good filtering effect is achieved.