90results about How to "Narrow particle size range" patented technology

The invention discloses a kit and method for preparing exosomes in serum or plasma. The kit comprises an exosome extracting reagent, wherein the exosome extracting reagent is a hydrophilic polymer ora solution of the hydrophilic polymer; the hydrophilic polymer comprises one or a combination of PEG (Poly Ethylene Glycol), dextran sulfate and PVP (Poly Vinyl Pyrrolidone); the molecular weight of the PEG is 20000-1200000 Daltons; the molecular weight of the dextran sulfate is 5000 to 20000 Daltons; and the molecular weight of the PVP is 10000 or 40000-700000 Daltons. The particle size distribution of the exosomes obtained by utilizing the kit is more concentrated; and according to the method for preparing the exosomes, which is provided by the invention, the step of purifying the exosomes is also optimized, so that the exosomes have less impurities and higher purity.

Provided is a method for preparing metal powder for 3D printing through a rotating electrode with the assist of plasmas. In a sealed container protected by an inert atmosphere, a low-voltage strong current is used for generating a plasma arc in a narrow and small space between a plasma assist electrode and the rotating cylindrical consumable electrode made from high-temperature metal. By means of the high temperature generated by the plasma arc, the section, close to the plasma arc, of the high-temperature metal electrode is made to enter a molten state, and small liquid drops of the high-temperature metal are formed. Centrifugal force generated by rotating the rotationally fed electrode made from the high-temperature metal at a high speed is used for throwing out the small liquid drops of the high-temperature metal. The small liquid drops of the high-temperature metal are air-cooled and solidified into balls in the sealed environment protected by the inert atmosphere, and the high-temperature small metal balls for 3D printing are collected from the bottom of the container.

The invention relates to a method for preparing a titanium alloy TC4 spherical powder by a plasma auxiliary rotation-electrode centrifugal process, comprising the following steps of: generating a glow discharge plasma arc between consumption type electrodes manufactured by a plasma auxiliary electrode and a rotational cylindrical titanium alloy TC4 in a closed container protected by inert gas, wherein a section of the titanium alloy TC4 electrode, which is close to the plasma arc, forms droplets due to high temperature generated by the plasma arc; throwing the droplets by centrifugal force; air-cooling and curing the titanium alloy TC4 droplets into a spherical shape in the inert atmosphere environment of the closed container; and obtaining a titanium alloy TC4 prill. The method can obtain the titanium alloy TC4 prill which has average sphere diameters between 0.08 mm and 1.8 mm and better monodispersity by changing technological parameters; in addition, the prepared powder prill has good sphericity, lower malformed particle proportion and controllable sphere diameter and can be used in the field of laser three-dimensional forming and for preparing special components of aerospace planes.

The invention discloses a long-circulation and high-power lithium ion battery positive electrode material, of which the molecular formula is LiNi<x>Co<y>Mn<1-x-y-z>Z O<2>. The long-circulation and high-power lithium ion battery positive electrode material comprises a single crystal or quasi-single crystal shell layer and a hollow part, wherein the single crystal or quasi-single crystal shell layer is formed by mutual fusion of primary particles, and the volume of the hollow part of secondary particles accounts for 0.8-50% of the volume of the whole secondary particles. The invention further discloses a preparation method, which comprises the following steps of: preparing a hydroxide precursor with crystallinity and morphology difference in the radial direction; and mixing the precursor with a lithium compound, and carrying out two-stage sintering on the mixture to obtain the lithium ion battery positive electrode material, wherein the first sintering is rapid heating, the temperature of the second sintering is higher than that of the first stage, and the second sintering enables the primary particles to be fused and mutually fused to form a single single crystal shell layer. The lithium ion battery positive electrode material disclosed by the invention is good in normal-temperature and high-temperature cycle performance and safety performance, can improve mechanical and electrochemical performance and compaction density, has the characteristics of quick charge, high capacity, high voltage, high cycle and low cost, and can be suitable for high-power motor vehicles.

The invention discloses a method and a device for preparing nanometer indium oxide through electrolysis. The method comprises the step of preparing indium hydroxide from an ammonium nitrate and ammonium polyacrylate mixed solution as an electrolyte, wherein a plurality of positive electrodes made of high-purity metal indium are adopted, a plurality of negative electrodes made of graphite are adopted, the positive electrodes and the negative electrodes are arranged alternately at intervals, and the electrolysis process is carried out in the existence conditions of ultrasonic waves; and after the indium hydroxide obtained through electrolysis is calcined at high temperature, nanometer indium oxide is obtained. The obtained nanometer indium oxide is high in purity, small in granularity, uniform in grain diameter, narrow in particle size range, good in particle shape and optimal in specific surface area, and a high-density sputtering target material can be prepared from indium oxide powder.

The invention provides coated submicron feed-grade zinc oxide and a preparation method thereof, and belongs to the field of feed additives. The invention aims at solving the problems in the prior art that zinc oxide can influence the biological potency of active components in feed, and coating wall materials can not degrade timely in intestinal environment; through shielding treatment for three times, a product is prepared by the following components by weight: 90-120 parts of submicron feed-grade zinc oxide, 28-35 parts of composite shielding agents; the composite shielding agent comprises the following components by weight: 80-90 parts of potato starch, 4-6 parts of ethyl cellulose, 3-4 parts of anhydrous alcohol, 0.5-0.8 parts of magnesium stearate. A feed-grade zinc oxide product and a corresponding preparation method thereof are provided, wherein the product combines appropriate control of the degeneration degree of the shielding agent, can deshield and release in animal digestive tract, gastric and intestinal environment, and is effectively used by microbe in posterior digestive tracts.

The present invention relates to a preparation method of immune nano-magnetic dextran microspheres, which belongs to the technical field of biological separation. In the process steps, nano-size magnetic iron oxide particles are prepared by the method of coprecipitation; a solution is prepared with ferrous ion, iron ion and nickel ion according to the molar ratio of 1:(1.0 to 4.0):(0.2 to 0.8); glucan enwraps the magnetic iron oxide particles; the proteins of the nano-magnetic dextran microspheres are linked. The present invention has the advantages of realization of the narrow diameter of particles, good reproducibility, low price and natural activity of the immune nano-magnetic dextran microspheres.

The invention relates to blue black metallic luster glaze which is prepared from the following components in parts by weight: 35-45 parts of an intermediate temperature lead-free high sodium and calcium frit, 15-20 parts of quartz, 5 parts of calcium carbonate, 3 parts of barium carbonate, 10 parts of calcined zinc oxide, 7 parts of kaolin, 4 parts of titanium dioxide, 3 parts of iron sesquioxide,8-10 parts of manganese dioxide, 3 parts of copper oxide, 2-4 parts of cobalt oxide, 1-2 parts of nickel oxide and 1-2 parts of vanadium pentoxide. The invention also provides a preparation method ofthe surface glaze. The preparation method comprises the following steps: mixing and ball-milling the glaze; applying the glaze; and carrying out primary firing. According to the blue black metallic luster glaze prepared by the invention, as enough metallic oxides such as iron sesquioxide, manganese dioxide, copper oxide, cobalt oxide, nickel oxide and vanadium pentoxide are introduced into the glaze, when the oxide of manganese reaches a saturated state, metals are separated out from the glaze surface; by adding copper oxide, a metal film is formed on the glaze surface; and by adding a certain amount of cobalt oxide, the glaze surface finally shows blue black metallic luster.

The invention relates to an infrared high-radiation and energy-saving coating used for glass melting kilns. The infrared high-radiation and energy-saving coating comprises, by weight, 5-30 parts of a high-radiation base material, 21-40 parts of quartz powder, 20-35 parts of silica sol, 1-6 parts of kaolin, 1-6 parts of bentonite, 2-12 parts of an antioxidant, 0-2 parts of a dispersant, 0-5 parts of a film forming auxiliary agent, and 5-20 parts of deionized water. The infrared radiance of the coating at a high temperature of 1500-1700 DEG C keeps at 0.86-0.96, and the coating has the advantages of high energy saving efficiency, long energy saving life, and no pollution to molten glass, and is suitable for float glass melting furnaces, container glass melting furnaces, glass fiber melting furnaces and other various types of glass melting furnaces.

The invention discloses a method for preparing copper alloy powder by means of a plasma rotating electrode. The method comprises the steps that firstly, batching is conducted according to the chemicalproportion of copper alloy components, and alloy bars are machined and manufactured through a smelting and forging machine; the alloy bars are put into plasma rotating electrode powder preparation equipment, and a powder preparation chamber of the equipment is filled with inert protective gas after being evacuated; and the equipment is started, the ultrahigh-speed alloy bars are molten into liquid through heating of a plasma arc heat source, the liquid is cast out and crushed into high-temperature small liquid drops under the action of centrifugal force, and the small liquid drops are solidified into spheres under the surface tension action in the quick condensation process and fall into a powder collector. According to the method for preparing the copper alloy powder by means of the plasma rotating electrode, the copper alloy powder is prepared by adopting a high-speed plasma rotating electrode technology, and the prepared copper alloy powder is high in sphericity degree, narrow in particle size range, low in content of hollow powder and satellite powder, low in content of gas inclusions and high in powder quality, has the excellent physical, chemical and comprehensive mechanicalproperties, and is especially suitable for being used in an electron beam powder spreading type additive manufacturing technology.

The invention provides a carbon black reaction furnace, and relates to a reaction furnace in the carbon black industry. The cross section of a throat section of the reaction furnace is polygonal and is shaped like a plum flower with six petals, bricks of the reaction furnace are arranged into a plurality of layers, and the layers are arranged crosswise. By means of the novel polygonal carbon black reaction furnace, carbon black with a stable narrow particle size range and high color intensity can be produced, so that the quality of the carbon black is largely improved. The novel polygonal carbon black reaction furnace has the advantages that the area of the cross section is covered to the maximum extent, the length of the flame of pyrolytic raw oil reaches the minimum value, the generation of invalid high-temperature gas is largely reduced, partial raw oil is prevented from being subject to an excessive pyrolytic reaction, and therefore the carbon black with narrow particle size distribution is obtained.

The invention discloses a process of preparing calcium carbonate by an air bubble film method and application thereof and belongs to the technical field of preparation of inorganic nonmetal calcium carbonate powders. The process herein comprises carbonization and surface treatment; refined calcium hydroxide slurry is quickly carbonized in an air bubble film quick carbonizing reactor; a slurry fromthe reaction is subjected to suitable surface treatment as required; the treated slurry is filtered, drying is carried out before crushing, and screening is performed to obtain calcium carbonate powder uniform in particle size. The process herein has no need for adding a crystal form control agent; the crystal morphology is controllable; the finished product has uniform particle size and good dispersity; the process is simple and feasible and has low production cost; the prepared calcium carbonate powder is applicable to the industries of plastics, rubber, papermaking, foods, medicine, and cosmetics, and has good economic and social benefits.

The invention discloses a preparation method of hollow rod-like calcium carbonate. The preparation method comprises the following steps: S1, accurately weighing calcium oxide, dissolving the calcium oxide in water, carrying out heating, stirring and standing digesting, carrying out screening, removing residues, and concentrating the product to obtain raw material calcium hydroxide slurry, S2, transferring the prepared calcium hydroxide slurry into a reaction kettle, adding sodium D-gluconate into the prepared calcium hydroxide slurry according to the concentration molar ratio of the calcium hydroxide slurry, controlling the temperature and the rotating speed of the mixed solution, and introducing CO2 gas for reaction to obtain product slurry, and S3, carrying out suction filtration and washing on the product slurry, separating a solid product, carrying out vacuum drying on the separated solid product, taking out the product and grinding the product into powder to obtain hollow rod-likecalcium carbonate. The method has the advantages of easy control of reaction conditions, high yield, low production cost, novel morphology, narrow particle size range, stable quality, good product dispersibility, simple production equipment, environmental protection, strong operability and the like, is suitable for industrial production, and can be widely popularized and applied.

The invention discloses a production method of high-quality ultrafine light calcium carbonate, belonging to the technical field of calcium carbonate production. A production method of high-quality ultrafine light calcium carbonate is characterized in that it comprises the following steps: (1) using limestone as raw material, putting it into a reaction furnace for heating and calcining to obtain calcium oxide, and sealing it for later use after cooling; Calcium is added to impurity-free water, stirred for 2-4h, and calcium hydroxide slurry is obtained after cooling down; (3) Carbon dioxide gas is introduced into the calcium hydroxide slurry at room temperature for carbonization, and carbonized to the pH of the calcium hydroxide slurry It is 6.5-7.5, obtains calcium carbonate slurry, stops carbonization; (4) puts the calcium carbonate slurry that step (3) obtains into storage tank and leaves standstill 10-12h, makes its pH value stabilize. The object of the present invention is to provide a production method of high-quality ultrafine light calcium carbonate, which is simple in operation, stable in quality, and capable of efficiently preparing high-quality ultrafine light calcium carbonate.

The invention relates to a household rice noodle machine which comprises a base, a crushing, extruding and forming system, a heating device and a driving system, wherein the crushing, extruding and forming system comprises an extruding and grinding cavity, a screw rod and a forming die head; the heating device is used for heating the extruding and grinding cavity; a feed inlet is formed in one end of the extruding and grinding cavity while the forming die head is formed at the other end of the extruding and grinding cavity; the screw rod is located in the extruding and grinding cavity, and is sequentially provided with a material propelling section, a coarse crushing section, a fine crushing and grinding section and an extruding section along the direction from the feed inlet to the forming die head; the screw rod is integrally formed; grinding helical teeth are uniformly distributed in the circumferential direction of the fine crushing and grinding section; grinding straight teeth corresponding to the grinding helical teeth are formed in the extruding and grinding cavity; the grinding straight teeth are uniformly distributed on the inner surface of the extruding and grinding cavity; a grinding slot is formed between every two adjacent grinding straight teeth; and a grinding gap h1 is formed between each grinding straight tooth and the grinding helical tooth. The household rice noodle machine provided by the invention is provided with the screw rod and the extruding and grinding cavity which is matched with the screw rod, and rice noodles which are relatively good in taste and appearance are prepared.

The invention discloses a preparation method for nano ferroferric oxide. The preparation method includes the following steps that: (1) water-soluble Fe<2+> salt and water-soluble Fe<3+> salt are dissolved in distilled water according to a proportion, so that solution A is obtained, and the molar ratio of the water-soluble Fe<2+> salt to the water-soluble Fe<3+> salt is 1:(0.8 to 2); hydrazine compound is mixed with distilled water, so that solution B is obtained; and under the protection of inert gas, and with stirring at the temperature of 2 DEG C to 25 DEG C, the solution B is dripped into the solution A, and solid is separated out after reaction is finished, and is washed and dried, so that FeO(OH) is obtained; and (2) the obtained FeO(OH) is put into a reaction kettle and added with alkali liquid to react under the temperature of 100 DEG C to 200 DEG C for 10 to 24 hours, the temperature is cooled to the room temperature after reaction is finished, so that solid is separated out, and the solid is washed and dried, so that nano ferroferric oxide particles are obtained. The preparation method is mainly used for preparing the nano ferroferric oxide.

The invention discloses a microstrip ring dendritic starch derivative and a processing method thereof, and belongs to the technical field of food processing. With starch as a raw material, the microstrip ring dendritic starch derivative is prepared through carbohydrate chain degradation and grading and glucoamylase catalysis glycoside conversion technologies and can be used as a stable carrier material of a food active factor. The method has the advantages of green environmental protection, high processing yield, low cost and the like; and the prepared product has the advantages of high branching degree, special large ring structure and good water solubility, can be applied to steady-state delivery and active protection of natural functional substances, and relates to the fields of nutritional food, medicine, daily chemicals and the like.

The invention provides a processing method of mica iron oxide. The processing method of the mica iron oxide includes the following steps that, (a) raw materials are broken; (b) the materials in the step (a) are subjected to ball-milling through a ball mill, and overflow generated after classification of a spiral classifier is fed into a first hydrocyclone for the first time of separation; (c) a second hydrocyclone is used for performing the second time of separation; (d) the third time of separation is performed in a third hydrocyclone, and fine grinding is further performed; (e) the overflow separated through a fourth hydrocyclone is iron oxide red, settled sand of the fourth hydrocyclone is iron oxide grey crude products, and the iron oxide grey crude products are concentrated through table concentrators at two times; and (f) concentration, dewatering and drying are performed on iron oxide grey and the iron oxide red, and iron oxide grey finished products and iron oxide red finished products are obtained. By means of the processing method of the mica iron oxide, prepared mica iron oxide products are large in content of sheet structures and smaller in average particle size, the particle size range is small, the purpose of producing the iron oxide red and the iron oxide grey at the same time can be achieved, and industrial production can be easily achieved.