93results about How to "Efficient and stable preparation" patented technology

A method for producing a microfibrillated cellulose, which comprises subjecting a slurry containing a pulp having a solids concentration of 1 to 6 wt % to the treatment with a disc refiner repeatedly ten times or more, to thereby prepare a microfibrillated cellulose having a number average fiber length or 0.2 mm or less and an amount of water hold of 10 mL/g or more, the amount representing the volume of water capable of being held by a unit weight of the cellulose fiber. The method allows the production of a microfibrillated cellulose having high quality with stability and with good efficiency.

Disclosed is equipment for measuring a silicon concentration in a phosphoric acid solution under use as an etching solution during operation of a semiconductor substrate processing system. The equipment is provided with at least a reaction tank and a concentration-measuring tank. The reaction tank includes a reaction unit for adding hydrofluoric acid to a predetermined constant amount of the phosphoric acid solution drawn out of the semiconductor substrate processing system to form a silicon fluoride compound and then causing the silicon fluoride compound to evaporate. The concentration-measuring tank comprises a hydrolysis unit for bubbling the silicon fluoride compound, which has evaporated from the reaction tank, through deionized water to hydrolyze the silicon fluoride compound and a measurement unit for determining a change rate of silicon concentration in the deionized water subsequent to the bubbling. Also disclosed is a method for measuring a silicon concentration in a phosphoric acid solution under recirculation and use as an etching solution in a semiconductor substrate processing system in operation.

The invention relates to a small-caliber aspherical composite precise processing method. The method comprises the following steps of: 1. clamping a workpiece (5) on a precise machine tool, wherein axes of a grinding wheel spindle (2) and a grinding head spindle (9) are parallel, separated from a sliding table (4) and intersected with the axis of a workpiece spindle (6); and grinding and processing an inclined shaft of the workpiece (5) by a micropowder grinding wheel (3); 2. carrying out in-place measurement on the workpiece (5) by using a detecting device (7) to generate a compensation processing track, and then processing along the track by the mocropowder grinding wheel (3); and 3. using a grinding head (8) to grind and polish the workpiece (5) to finally obtain a finished product. In the small-caliber aspherical composite precise processing method, precise inclined axis mirror grinding and inclined axis magnetorheological polishing and grinding are integrated into a single machine tool, so that the installation and the tool setting errors are reduced, the working hours are also reduced, the accuracy and the efficiency are improved, the interference phenomenon is prevented, the controllability is good, and continuous processing can be achieved.

A spark plug for an internal combustion engine includes: a cylindrical insulator as defined herein; a center electrode as defined herein; a cylindrical metal shell as defined herein; and a ground electrode as defined herein, an annular gasket receiving portion projecting radially outward being provided on a rear end side of the externally threaded portion of the metal shell, and a metallic gasket capable of abutting against the gasket receiving portion being provided on the outer periphery of the metal shell, wherein the gasket has a solid annular shape, an inside diameter of the gasket is smaller than an outside diameter of the externally threaded portion, and a groove portion whose depth coincides with the direction of the axis is provided over an entire circumference of the gasket.

A method for efficiently and stably manufacturing a nozzle plate wherein nozzle openings are accurately formed. According to an ink jet head nozzle plate manufacturing method for emitting a laser beam through lenses onto the face of a nozzle plate to form a plurality of nozzle openings, these lenses are a plurality of micro lenses arranged on the same plane, and the pitch for arranging the micro lenses that are adjacent in the direction in which the nozzle openings are formed in the nozzle plate is defined as an integer multiple of the pitch for arranging adjacent nozzle openings.

The invention relates to a manufacturing method of water absorption resin with high liquid absorption rate. The manufacturing method comprises the following steps: acquiring a monomer containing unsaturated acrylic acid and a cross-linking agent aqueous solution; polymerizing the monomer containing the unsaturated acrylic acid and the cross-linking agent aqueous solution monomer to obtain a hydrogel-like cross-linked polymer; granulating and crushing the hydrogel-like cross-linked polymer in the polymerization process or after the polymerization by virtue of a high shearing and/or extrusion acting force to form gel particles, drying, crushing, and screening. The manufacturing method has the beneficial effects that a method using no additives such as a foaming agent, and a surfactant and capable of efficiently producing the water absorption resin with high liquid absorption rate is provided, and the water absorption resin with high liquid absorption rate is obtained.

The invention relates to a high magnetostriction coefficient Fe-Ga based thin strip and a preparation method thereof. According to the high magnetostriction coefficient Fe-Ga based thin strip and thepreparation method thereof, slabs of die casting, slab continuous casting, thin slab continuous casting and thin strip continuous casting are adopted, and simple and efficient scale production can berealized by using traditional rolling and annealing processes; an inhibitor system of low temperature intrinsic inhibitors and nitriding is established, and heat treatment and the rolling process arecontrolled to precipitate fine Cu2S, Nb(C,N) and V(C,N) or composite precipitates thereof as main intrinsic inhibitors; when the intrinsic inhibition is insufficient, nitriding is used for supplementing and forming nitrides such as AIN or BN before the secondary recrystallization annealing to achieve flexible control of the inhibition; cold rolling parameters are fine controlled to ensure primaryrecrystallization to obtain fine and uniform organizations and favorable textures, the coordinated matching of the organizations, the textures and the inhibitors before secondary recrystallization isachieved, and perfect and sharp secondary recrystallization of texture Goss ({110}(001)) is obtained. The magnetostriction coefficient (3/2) lambda s of a Fe-Ga based thin strip finished product is ashigh as 220-370ppm.

A microporous film which is excellent in permeability and mechanical strength and has breakage resistance at high temperatures; a separator for a nonaqueous-electrolyte battery which comprises the microporous film; and a nonaqueous-electrolyte battery employing the separator. The microporous film has a gel content of from 20 to 90% as determined through 3-hour immersion in boiling xylene.

The invention relates to a method for producing polyacrylic water-absorbing resin, which comprises obtaining an aqueous solution containing unsaturated acrylic monomers and a crosslinking agent; mixing the azo compound solution with the initiator solution, and then preparing a polyacrylic acid-based water-absorbing resin that is simultaneously used as an initiator and a foaming agent Initiator-foaming agent particle dispersion liquid, described azo compound solution is the compound solution that contains primary ammonia, secondary ammonia, tertiary ammonia or quaternary ammonium salt group, and described initiator solution is the solution that contains persulfate compound, The mass ratio of the azo compound component to the persulfate component is 100:1 to 1:100, and in the initiator-foaming agent particle dispersion, the number average particle size of the initiator-foaming agent particle The diameter is 0.1 to 900 microns; the initiator-foaming agent particle dispersion is mixed with the unsaturated acrylic monomer and the crosslinking agent aqueous solution to polymerize to prepare a hydrogel polymer, and the polymer is granulated and dried , crushing, sieving and surface crosslinking. A water-absorbent resin having a high liquid absorption rate and a composition thereof are obtained.

The invention relates to a preparation method of an MoS2/MoO2 heterojunction, and belongs to the technical field of nano-optoelectronic material preparation. The problems that existing heterojunctionpreparation methods are prone to introducing impurities and poor in repeatability can be solved. A solid S and MoO3 are used as a precursor, and the MoS2/MoO2 heterojunction is synthesized on a targetsubstrate after a chemical gas-phase reaction, wherein the concentration of S vapor in a tubular furnace temperature area can be adjusted through the magnitude of carrier gas flow. Compared with a positioning mechanical transfer method, according to the preparation method of the MoS2/MoO2 heterojunction, the large-area MoS2/MoO2 heterojunction can be prepared stably and efficiently, and the preparation method can extend to preparation of a Van der Waals heterojunction based on two-dimensional transition metal chalcogenide. The obtained MoS2/MoO2 heterojunction can be used for scientific research and making nano-optoelectronic devices.

The invention discloses a manufacturing method of polyacrylic acid-series water-absorbent resin. The manufacturing method comprises the following steps: obtaining an aqueous solution which contains unsaturated acrylic monomers and a cross-linking agent; mixing foaming agent particles and/or a foaming agent solution, unsaturated acrylic monomers and a cross-linking agent aqueous solution; polymerizing a monomer water solution to form a porous gel-like cross-linked polymer; crushing the porous gel-like cross-linked polymer into gel particles through shearing and/or extruding acting force in a polymerizing process or after polymerizing, wherein the number average particle size of the gel particles is 0.5 to 20 mm, the weight percentage of the gel particles with the particle size of greater than 2 mm is 10 to 100 percent, and the porous structure destruction rate of the gel particles is 0 to 70 percent after the porous gel-like cross-linked polymer is subjected to the shearing and/or extruding acting force; further drying, fining and screening the manufactured gel particles. The liquid absorption characteristic of the water-absorbent resin is not influenced; the water-absorbent resin with high-speed liquid absorption rate and low monomer residue amount can be produced and obtained highly effectively.

The invention discloses a groove composite multi-bulge structure and a preparation process thereof. The groove composite multi-bulge structure provided by the invention comprises a substrate, the semiconductor device further comprises a plurality of grooves arranged on the substrate, wherein the substrate is provided with a groove, the protrusions are compounded on the surface of the groove, the transverse size of the top of the groove is smaller than or equal to 1 micrometer, at least 1*105 grooves are formed in the substrate per square millimeter, the number of the protrusions compounded onthe surface of each groove is larger than or equal to 40, and the transverse size of the end, close to the surface of the groove, of each protrusion is larger than or equal to 60 nanometers. The SERSsubstrate is very novel in structure, and has high light absorption capacity and high SERS activity.