253results about How to "Small particle size distribution" patented technology

The invention discloses a metal or ceramic consumable item for FDM 3D printing, a preparation method for the metal or ceramic consumable item and a finished product printing method. The metal or ceramic consumable item comprises, by weight, 15-50 parts of a high polymer material, 0-2 parts of a compatilizer, 50-80 parts of metal powder or ceramic powder, 0.1-1 part of an antioxygen and 0.1-2 parts of a lubricating agent. The cost for equipment, the materials and machining is low; a printing structure is free of limitation, collapsing conditions do not exist in the printing process, supports can be removed before fusion sintering of the product, and treatment is easier compared with a manner that the supports are removed after SLS or EBAM fusion sintering; the requirements for the sphericity degree, the size distribution, the mobility and the like are relatively low; the types of metal and ceramic capable of being printed are wider; and the density of the finished products is higher, the strength is high, the degree of finish is higher, the miniaturization capacity is high, the thin-wall capacity is high, the complexity is high, the design tolerance level is high, and the material adaption scope is wide.

A toner which is negatively charged to develop an electrostatic latent image is provided that contains a colorant; and a binder resin, wherein the toner has an acid value of from 5 to 20 mg KOH / g and an amine value of from 0.5 to 10 mg KOH / g.

A process for preparing zirconium oxide nano-particles used for coated thermal barrier layer includes such steps as preparing the mixed solution of zirconium oxychloride and yttrium oxide (or chloride), adding ammonia water, washing for dispersing, hydrothermal reaction to generate Y-stabilized ZrO2 nano-particles, separating, coating by aluminium oxide, drying, granulating and heat treating.

The invention relates to a method of preparing intercalation modified kaoline, firstly dispersing the kaoline in an intercalation agent solution to form uniform suspension serum, then making ultrasonic treatment, and finally separating, washing, drying and grinding to obtain the products, where the ultrasonic treatment: placing the suspension serum in a ultrasonic reactor, using 30-60 deg. water as medium, regulating ultrasonic frequency to 15-40 KHz, and making mixing ultrasonic treatment for 3-4 hours. It is a method of saving energy sources and benefiting environmental protection, and has high intercalation efficiency, the need time is short, on conditions of relaxative operation and environment, it can make the intercalation ratio up to above 90%.

The invention provides a method for preparing flake silver powder with low bulk density. The method comprises the following steps of reducing silver powder, i.e. adding pure water into a reaction container, and adding silver nitrate under a stirring condition to make the silver nitrate completely dissolved; adding a PH(Potential Of Hydrogen) value regulator, stirring, adding formaldehyde serving as a reducer to perform chemical reaction, washing the silver powder and drying; and ball-milling, i.e. weighing the silver powder, adding zirconia, filling in a ball-milling pot, adding a ball-milling solvent, a ball-milling aid and an emulsifier, ball-milling, sieving, washing by using a cleaning solvent, and drying to obtain the flake silver powder. The silver powder prepared in the reducing process by the method is not added with any dispersing agent, has low impurity content and high purity; and moreover, the technical process is simple, the ball-milling time is short, and the method is easily industrialized.

The invention discloses a nano-silver antibacterial composite modified by modified chitosan and a preparing method of the nano-silver antibacterial composite. According to the nano-silver antibacterial composite and the preparing method of the nano-silver antibacterial composite, the chitosan with the small molecule quantiy and good water solubility is selected and used as a raw material, chemical modification is conducted on the chitosan by using small molecules which are capable of having chelation with nano-silver particles, the modified chitosan is arranged on the surfaces of the nano-silver particles in a covalent modification mode, and the novel nano-silver antibacterial composite is prepared. The prepared nano-silver antibacterial composite modified by the modified chitosan has good water solubility and dispersibility and can be stably dispersed in a water solution in a long term without aggregation under the conditions of high salinity and wide pH. The prepared nano-silver antibacterial composite modified by the modified chitosan enables the antibacterial property of the chitosan and the antibacterial property of nano-silver to be in effective synergy, the antibacterial performance is good, and the nano-silver antibacterial composite can serve as a water coating agent to perform the surface antibacterial function on the surfaces of materials and can also permeate into fiber type materials to perform the deep internal antibacterial function.

The invention provides a graphene-based composite ternary material. The ternary material comprises graphene and a nickel-cobalt-manganese ternary material, wherein the graphene is prepared by sintering oxidized graphene, is composed of single-layered graphene slices or multi-layered graphene slices whose layer number is less than 10, and accounts for 0.1% to 10.0% of the total weight of the composite ternary material; and the nickel-cobalt-manganese ternary material has a primary particle structure or a secondary particle structure, has a molecular formula of Li(Ni<x>Co<y>Mn<z>)O2, wherein the sum of x, y, and z is equal to 1, and x, y, and z are all in a range of 0 to 1, and accounts for 90.0% to 99.9% of the total weight of the composite ternary material. The graphene slices are freely stacked in the graphene, thus conductive nets and cavities are formed, and the nickel-cobalt-manganese ternary material particles are embedded into the cavities between the nano graphene layers through a chemical precipitation method. The invention also provides a preparation method of the graphene-based composite ternary material.

The invention relates to an online detection method of dust in a high pressure natural gas pipeline and a device thereof, and the method comprises the steps that: a static pressure balanced sampling nozzle (2) is inserted into a pipeline (1) from a pipeline joint pipe (5), flow is regulated to achieve sampling in an equal motion way; the gas in an inner chamber and an outer chamber is divided into two parts by the sampling nozzle (2), which are respectively transferred to a differential pressure sensor (11) for detection, when the display result of the differential pressure sensor (11) is zero or within the precision range, the natural gas collected in the equal motion way is condensed and dried, the instantaneous flow and the accumulated flow of the gas are recorded, and the pressure and the temperature at the time are tested; then, the natural gas is reduced to be one atmospheric pressure by decompression, the gas needed by a particle analyzer (24) is taken out in the equal motion way, the pressure and the temperature at the time are tested, and the redundant gas is discharged; the natural gas after the detection by the particle analyzer (24) is discharged; dust concentration C0 in the natural gas pipeline is calculated by the parameters of the pressure, the temperature and the flow before and after the decompression according to the dust concentration C1 detected by the particle analyzer (24).

The invention discloses a preparation method of a small-particle size ternary positive material precursor. The preparation method comprises the following steps of (1) selecting a nickel, cobalt and manganese solution as the raw material, preparing into a metal mixing salt solution, adding a special reaction base solution into a reaction kettle in advance, mixing the metal salt solution, a complexing agent and a precipitant according to a stoichiometric number ratio, and adding into the reaction kettle in a cocurrent flow way; (2) filling particles with D50 particle size into the reaction kettle for the first time, and controlling the D50 particle size to 1 to 2mu m; after the reaction kettle is full, directly overflowing the material into a prepared aging kettle via an overflow pipe, and immediately stopping material feeding when the particle size of the particle in the reaction kettle grows to 3.5 to 4mu m after 10 to 20h; (3) washing, screening, and packaging, so as to obtain the small-particle size ternary precursor with particle size of 3 to 4mu m. The preparation method of the small-particle size ternary positive material precursor has the characteristics that the integrity ofthe crystal structure is good, the degree of sphericity is better, the cyclicity is better, the technology operation is simple, the continuous production is realized, and the green and energy-savingeffects are realized.

The invention relates to a nano-sensitive material for monitoring sulfur dioxide, which is characterized in that chromatic salt and aluminum salt are used as initial materials, and Cr2O3 and Al2O3 nano-powders doped with Pd atoms are prepared after the processes of dissolving, aging, evaporating, drying, grinding, roasting, doping, baking and the like, wherein the content ranges of all the components are as follows: 1-2% of Pd, 40-45% of Cr2O3 and 53-59% of Al2O3, and the particle sizes of all the components are less than 30nm. A sulfur dioxide sensor prepared from the sensitive material disclosed by the invention has the advantages of wider linear range, better selectivity, higher sensitivity and long service life of over 150 h; and micro sulfur dioxide in air can be detected on line without the influence from coexist substances.

The invention provides preparation methods of modified carbon black and black chemical powdered ink. The preparation method of the carbon black comprises the following steps: (1) adding 5 to 30 parts by weight of carbon black to 100 to 500 parts by volume of concentrated acid; uniformly agitating; and controlling the temperature to be 30 to 70 DEG C to react for 2 to 6 hours; (2) adding 15 to 50 parts by weight of strong oxidant to the mixed solution obtained in step (1), and reacting for 1 to 3 hours in a water bath at 30 DEG C; and (3) agitating the mixed solution obtained in step (2), slowly adding deionized water, diluting, performing reduced-pressure suction filtration, and washing to obtain the modified carbon black. The black chemical powdered ink is prepared through such modified carbon black. Due to the adoption of the preparation methods, the problems of the prior art that the carbon black has poor wettability and is instable in an aqueous medium to further cause that the powdered ink is non-uniform in particle distribution and excessively wide in particle size, can be solved.

The invention provides series amiopyrimidine-modified gold nano particles. In the amiopyrimidine-modified gold nano particles, the amiopyrimidine may be one or more of 2-thiol-4,6-diamino-pyrimidine, 2-thiol-4-amino-pyrimidine and 2,4-diamino-6-mercaptopyrimidine. The particle size of the amiopyrimidine-modified gold nano particles is 1.5 to 10.0 nanometers; and the molar content ratio of amiopyrimidine molecules to gold element in the nano particles ranges from 0.1 to 0.9. The amiopyrimidine-modified gold nano particles have antibacterial effect, can be widely used for preparing antibacterial medicines such as anti-gram-negative bacilli penicillins medicines, anti-gram-positive bacterium medicines or / and anti-multi-medicine-resistance clinically isolated bacterium medicines. The invention also provides the preparation method and use of the amiopyrimidine-modified gold nano particles. The invention further provides antibacterial medicines containing the amiopyrimidine-modified gold nano particles.

The invention discloses a preparation method of precursor iron phosphate of cathode material lithium iron phosphate of a lithium ion battery, which comprises the following steps: simultaneously addingferrous ion aqueous solution with the concentration of 0.05-2mol / L and phosphate radical aqueous solution into a reactor according to the stoichiometric ratio of ferrous ions and phosphate radical ions of 0.8-1.2: 1 and at the speed of 400-1000mL / h, and reacting for 0.2-2h under the conditions that the reaction temperature is 50-90 DEG C and the stirring speed is 400-1200rpm; adding hydrogen peroxide with excessive stoichiometry and reacting for 0.2-2h, and ageing for 2-8h, filtering, washing and drying to obtain iron phosphate powder with two crystallization water; and in the obtained iron phosphate, the total ferric content (Fe) is 29.5-30.5 percent, the P content is 16.0-16.9 percent, the particle size is 0.1-1Mum, and D50 is 1-5Mum. The invention has simple and convenient operation process, simple device, easy control, low energy consumption, even and fine particle size distribution and high reaction activity and is suitable for preparing the lithium ion battery cathode material lithium iron phosphate.

A method for producing resin particles using a dispersion liquid in which a dispersoid mainly made of a resin material is finely dispersed in a dispersion medium, the method comprising a dispersion liquid ejecting step for ejecting the dispersion liquid in the form of droplets and a dispersion medium removing step for removing the dispersion medium from the dispersion liquid in the form of droplets, wherein a granulation prevention agent for preventing or suppressing fine particles derived from the dispersoid from being agglomerated and then granulated is applied to the dispersion liquid.

The invention relates to base metal copper electrode slurry and a preparation method of a capacitor from the same. The base metal copper electrode slurry comprises the following components (wt%): 30-65 wt% of spherical copper, 10-30 wt% of sheet copper, 1.52-10 wt% of glass powder, 2-15 wt% of inorganic non-metallic additive, and 10.5-24 wt% of organic carrier, wherein the glass powder is a ZnO-B2O3-SiO2-Bi2O3 glass system; the inorganic non-metallic additive is one or more selected from CuO, Cu2O, ZnO and B2O3; and the organic carrier is polymer resin and a solvent. The base metal copper electrode slurry can be used in a ceramic disc capacitor and a semiconductor disc ceramic capacitor chip, the sintering temperature is 600-800 DEG C, and after sintering, the copper electrode slurry is converted to a copper electrode. The base metal copper electrode slurry has the characteristics of low cost, uniform material, uniform particle size distribution, high dispersibility, good forming process, and environmental friendliness.

The invention relates to a preparation method and applications of super-hydrophobic SiO2 aerogel powder. The method is implemented through the following steps: preparing a silicon source solution, an oil phase, a surfactant and a surfactant aid into a microemulsion; then, neutralizing the microemulsion until the pH value is 6-10 so as to form wet microgel particles; sequentially carrying out ageing, washing and solvent exchange on the wet microgel particles; finally, modifying the obtained product by using a silane modifier, and drying gel at normal pressure and temperature so as to obtain aerogel powder. The method is capable of preparing aerogel powder by using a microemulsion, the particle size of aerogel powder prepared by using the method is uniformly distributed, and prepared aerogel powder has the characteristics of controllable particle size distribution, short preparation period, and capability of being dried at normal pressure and temperature.

The invention discloses a method for preparing a cathode material of lithium iron phosphate for a lithium ion battery. The method comprises the following steps: firstly, adding a certain amount of deionized water into a ball mill, and adding lithium dihydrogen phosphate and ionic compound with good conductivity into the ball mill for stirring and ball milling at a high speed; secondly, adding iron oxide for stirring and ball milling at a high speed, and adding a certain amount of anhydrous ethanol as a dispersing agent; and finally, adding superfine conductive carbon black for full mixing and stirring to obtain evenly mixed powder by spray drying at a high speed, adding the powder into a mixing roll for mixing and granule crushing, and pressing the mixed powder into a block to improve the density of materials once again. After being preserved and sintered for 2 to 6 hours at 600 to 800 DEG C in a non-oxidizing sintering furnace and cooled below 50 DEG C, the materials after tablet pressing and granulation are discharged, crushed, refined and sifted, and the powder is dried so as to obtain lithium iron phosphate powder with no impurities, single structure and small granule size distribution. In addition, the preparation process method through improvement significantly reduces the cost for preparing the lithium iron phosphate and has little pollution.

The invention relates to a high performance concrete material used in prestressed components of non-ballasted tracks and a preparation method thereof. The gel material is cement, the aggregate is sand and stone, the admixture is complex mineral powder, and then high efficiency water reducing agent and water are added, stirred and vibrated, thus preparing the material. The components of the complex admixture are aluminosilicate, carbonate and sulfate, and the relative weight ratios are as follows: 15 to 80 percent of the aluminosilicate, 15 to 80 percent of the carbonate and 5 to 20 percent of the sulfate, and the total weight is 2 to 6 percent of the total weight of the concrete component. The material can ensure that the early strength of the concrete can achieve the required technical indexes of the prestressed concrete component used in non-ballasted tracks, thus obviously increasing the comprehensive properties, the workability and the durability of the concrete component. By using ordinary portland cement instead of superfine cement with deficient material source and exorbitant price, the product quality in mass production can be increased and the problem of high production cost of the prestressed concrete preformed component used in non-ballasted tracks can be solved.

The invention discloses a preparation method of lithium iron phosphate oxide of cathode material of a lithium ion battery, which comprises the following steps: adding ferrous ion aqueous solution withthe concentration of 0.05-2mol / L and ammonium dihydrogen phosphate solution into a reactor according to the ratio of 1: 1; reacting for 0.2-2h under the conditions that the reaction temperature is 50-90 DEG C and the stirring speed is 400-1200rpm; adding excessive hydrogen peroxide and reacting for 0.2-2h, and ageing, filtering, washing and drying to obtain precursor iron phosphate powder; mixingthe iron phosphate powder, lithium ions in a lithium source and carbon atoms in a carbon source according to the mol ratio of 2: 2: 0.1-0.6 by taking absolute ethanol as a medium, and then putting into a planetary ball mill for grinding to obtain precursor solution of the lithium iron phosphate oxide; and then roasting to obtain the lithium iron phosphate oxide with the particle diameter of 0.5-5Mum. The product prepared by the method has even and fine particle diameter distribution, high reaction activity, simple and convenient operation process, simple device and easy control, and effectively improves the electrochemical property and reduces the cost.

The disclosed sol gel method includes steps: stirring, and mixing objects: water solutions of lithium salt, villiaumite, vandic salt in pentavalence, phosphate, and chelating agent according to mol ratio 2í†2í†1-2í†2í†4; controlling pH at 7-11, carrying out reaction in stirred reactor under 40-80 deg.C for 1-5 hours to form gel; drying the gel in vacuum drying oven for 5-15h under 80-150 deg.C, and cracking the dried gel for 1-4h; after being ground evenly, the dried gel is roasted at 400-800 deg.C under atmosphere of inert gases for 5-20h so as to obtain finished product. Using vandic salt in pentavalence as raw material, the invention solves issue that vanadium ion is to be oxidized. The invention reduces burning temperature; producing fine and grain size even distributed material so as to raise conductivity. Adjustable synthesis temperature can obtain material with different granularities. Advantages are: simple and convenient method, and shortened synthetic cycle.

The present invention discloses a preparation process for a core-shell nanoparticle emulsion for impact modification of aqueous epoxy resin. The preparation method comprises the following steps of: step A, using a sol-gel method to prepare uniformly dispersed nanosilica, and using a silane coupling agent to conduct surface hydrophobic modification on the nanosilica to obtain hydrophobic nanosilica; and step B, using a micro-suspended seed emulsion polymerization method and the hydrophobic nanosilica obtained in step A as a core structure, and using methacrylate and a glycidyl methacrylate monomer to conduct polymer coating to obtain the product. Core-shell structure nanoparticles prepared by the preparation process, using silica as the core with the surface coated with polymers, have the advantages of high coating rate, uniform size and same shell thickness.

The invention discloses a method for producing fluorophoshoric acid vanadium lithium of lithium iron battery positive pole material at low temperature by one-step solid phase reaction, comprising the step of: uniformly blending vanadic oxide powders, phosphate, organic acid, lithium salts with villaumite to sinter for 3 to 12 hours under the protection of inert gases, consequently the final product LiVPO4F is obtained after cooling; the invention is simple and convenient in usage, easy in control and low in cost, and simplifies the synthesis process and promotes the discharge and charge performance and circulation performance of samples.

The invention discloses a long-acting sustained-release wound dressing containing levofloxacin sustained-release microspheres. According to the preparation method of the wound dressing, levofloxacin sustained-release microspheres with grain diameter between 10 and 20mu m are fixed in a composite medical non-woven fabric which mainly comprises chitosan fiber, alginate fiber, viscose fiber, and hydrophobic ethylene propylene fiber; and the long-acting sustained-release wound dressing is prepared by taking the levofloxacin sustained-release microspheres as a medicinal component. In a use process, the medicament quickly release levofloxacin after contacting the blood, tissues and surrounding skin of the wound, and can continuously release levofloxacin for a long time, and the effective release of levofloxacin accumulatively reaches 168h. The long-acting sustained-release wound dressing is applied to treatment of bacterium infection of burnt and scalded skin, and the microsphere state medicament can remarkably improve the bioavailability of effective components of the medicament; and the long-acting sustained-release wound dressing has excellent moisture penetrability, hygroscopicity, mechanical tensile property and biocompatibility, the frequency of dressing change can be reduced, and the curative effect and administration safety cam be enhanced.

The present invention provides the manometer composite oxide sensitive material of ammonia, which is characterized in that the present invention is combined by WO3, Cr2O3 and TiO2; wherein, the atom ratio of W and the Cr is 100 to 45 to 55; the atom ratio of the W and the Ti is 100 to 27 to 36; particle size distribution is between 25 and 45 nm. An ammonia sensor prepared by the sensitive material provided by the present invention has good selectivity and sensitivity for the detection of the trace amount ammonia gas in the air; and no disturbance is caused among common coexistent gases.

The invention discloses a heatproof microencapsulated essence used for thermoplastic high polymer materials, and its preparation method. The heatproof microencapsulated essence treats an oil-soluble liquid essence as a capsule core, a gelatin modified amino resin prepolymer as an emulsification dispersant and a gelatin modified amino resin composite material as a wall material. The preparation method of the heatproof microencapsulated essence comprises the processes of prepolymerization, emulsifying dispersion and microcapsule coating. The heat decomposition temperature and the softening temperature of the microencapsulated essence can reach above 200DEG C, mechanical performances comprising the heat resistance, the toughness and the like of the microencapsulated essence are excellent, and the microencapsulated essence has a long-lasting fragrance; and the particle size of the microencapsulated essence is 1-10mum, so the microencapsulated essence can be easily and uniformly dispersed in the high polymer materials.

A method for producing resin particles using a dispersion liquid in which a dispersoid mainly made of a resin material is finely dispersed in a dispersion medium, the method comprising a dispersion liquid ejecting step for ejecting the dispersion liquid in the form of droplets and a dispersion medium removing step for removing the dispersion medium from the dispersion liquid in the form of droplets, wherein a granulation prevention agent for preventing or suppressing fine particles derived from the dispersoid from being agglomerated and then granulated is applied to the dispersion liquid.

The invention relates to a catalyst used for olefin polymerization and a preparation method thereof. The preparation method is as follows: in a reactor, under the protection of nitrogen, adding an organic solvent and a titanium compound, cooling to-30 to-10 DEG C, adding a carrier, maintaining at-30 to-10 DEG C, and stirring for 30-40min; slowly heating to 100 to 120 DEG C, in the heating process, adding an electron donor compound, reacting at 100-120 DEG C for 30-40min, filtering a liquid, again adding the titanium compound, heating to 110 to 130 DEG C, maintaining at 110 to 130 DEG C for 30-40min, filtering the liquid, washing an obtained solid, and drying under vacuum to obtain a target product. In a magnesium halide alcohol adduct formation process, a forming agent and a particle form control agent are added, the particle size distribution of the obtained carrier is more concentrated, the carrier is used for preparing the catalyst, activity and hydrogen sensitivity of the catalyst can be improved when the carrier is used for olefin polymerization especially for propylene polymerization, the bulk density of an obtained polymerization product is moderate, and the polymerization product is basically free of abnormity materials.

The invention provides kiwi fruit micro-powder and a preparation process thereof, and relates to fruit powder and a preparation method of the fruit powder. According to the technical scheme provided by the invention, the preparation process of the kiwi fruit micro-powder comprises the following steps: cleaning kiwi fruit, draining off, and cutting into slices for later use; enclosing the cut kiwi fruit into a charging tray; putting into a vacuum drying room, dewatering and drying; crushing the dried kiwi fruit in a fully-closed state under the protection of nitrogen, and then sieving, so as to obtain micro-powder; and bagging the micro-powder in a low-temperature environment, and sealing in vacuum. The preparation process disclosed by the invention is advanced; 100% of skin, pulp and seeds of the kiwi fruit are utilized; raw materials are fully saved; the utilization efficiency is improved; and the kiwi fruit micro-powder is good in keeping of nutritional ingredients, good in color and luster, and convenient to store and transport for a long period of time.