183results about How to "Good spherical shape" patented technology

The invention relates to a plasma rotary electrode powder milling set and a process thereof, relating to the technical field of powder metallurgy. The milling set comprises a rotating feeding mechanism, a vacuum furnace, a vacuum unit, a plasma gun device and an electrical source. The rotating feeding mechanism is arranged at the exterior of one side of the vacuum furnace; the plasma gun device is arranged at the interior of the other side of the vacuum furnace; the vacuum unit is communicated with the vacuum furnace through a ventilation pipe, wherein, the vacuum furnace body has a double-decker sandwich structure, and cooling circulating water is injected into the sandwich structure; a receiving mechanism is arranged at the bottom part of the vacuum furnace, wherein, the receiving mechanism comprises two cut-off valves connected in series. The process includes the following steps: metal is processed into electrode bars; low-voltage heavy current is applied to the electrode bars to melt the electrode bars in a highly vacuumized melting chamber through the high temperature produced by the cathode arc of the plasma gun, and to eject the molten metal instantly by the strong centrifugal force produced through the high-speed rotation of the electrode bars to produce fine metal powders. The invention is characterized in that the yield of perfect spherical metal powders is up to 97 percent, and the powders are free from the contamination of any microelement.

The invention relates to a plasma atomization method and apparatus for preparing spherical pure titanium or titanium alloy powder, and belongs to the technical field of preparation of titanium or titanium alloy powder. The plasma atomization method for preparing pure titanium or titanium alloy powder comprises the following steps of (1) preparing a titanium wire or titanium alloy wire with the diameter ranging from 3 millimeters to 20 millimeters, (2) using a plasma torch to fuse and atomize the titanium wire or titanium alloy wire in an atomization bin with an argon atmosphere to obtain atomized pure titanium particles or titanium alloy particles, and (3) feeding argon flow with the temperature ranging from 300 DEG C to 500 DEG C into the atomization bin, carrying out laminar cooling on the atomized pure titanium particles or titanium alloy particles to obtain pure titanium or titanium alloy powder. The obtained powder is good in degree of sphericity and low in the content of satellite balls, and has the advantages of being uniform in size distribution, high in purity and degree of sphericity, good in liquidity, low in oxygen content and impurity content, free of bond or cluster phenomenon and the like. The prepared titanium powder can be widely applied to the forming manners such as metal additive manufacturing, powder injection moulding and hot isostatic pressing for manufacturing parts with high precision.

The invention discloses a method for preparing poly-organic silsesquioxane microsphere, comprising the following steps: 1) adding mixture of one or arbitrary several kinds selected from compound in structure general formula R1Si(OR2)3 into the mixture solution of water and alcohol, uniformly stirring the mixture, wherein R1 is hydrogen, methyl or vinyl, R2 is C1-C4 alkyl; 2) adding aqueous solution of alkali metal hydroxide or ammonia water into the reaction system and obtaining products after reaction. The method uses one-step method and the reaction is performed at normal temperature withoutcatalyst containing inorganic ion. The technology is simple and the production period is short and the obtained poly-organic silsesquioxane microsphere has good shape and the particle size is in narrow distribution at micro order.

The invention relates to a microencapsulation method for preparing a hydrotropic substance serving as a core material by using a complex coacervation method. The method is simple in process and low in cost, and the product has high encapsulation rate. The method comprises the following steps of: (1) weighing specific protein and polysaccharide in a certain ratio, stirring and dissolving in hot water to form a wall material solution; (2) weighing a certain mass of hydrotropic core material substance, adding an oil phase substance and an emulsifier in a certain mass ratio, and performing high-speed dispersion to form water/oil (W/O) emulsion; (3) directly pouring the emulsion into the wall material solution, stirring at the constant temperature of 45 DEG C, regulating pH by using 10 percent acid, and reacting for 15 minutes; (4) cooling to the temperature of below 15 DEG C, regulating the pH to 6.0, and adding glutamine transaminase for solidifying; and (5) filtering to obtain a wet capsule product. A dry microcapsule product can be obtained by freeze drying or spray drying.

The invention discloses a method for preparing polystyrene/conductive polymer composite hollow microspheres, which comprises the following steps of: adding aniline or pyrrole and acid or mixture thereof into polystyrene emulsion under the protection of inert gas, stirring the obtained mixture for at least 10 minutes, and then adding an initiator into the mixture to perform polymerization, whereinthe molar ratio of the aniline or the pyrrole to the acid is 0.2 to 0.8, the weight ratio of the aniline or the pyrrole to the polystyrene is 0.1 to 1.0, and the initiator is ammonium persulfate, potassium persulfate, iron trichloride or ferrous sulfate heptahydrate/ hydrogen peroxide. Different from the traditional method for preparing the hollow polymer microspheres, the method does not need high-temperature calcination or solvent denucleation treatment and can prepare the polymer composite hollow microspheres by one step, and the microspheres have good appearance and monodispersity. The method is simple, has a few operation steps, and is easy for subsequent treatment; and because the used solvent is a green solvent, the method is safe and reliable, and has low cost.

The invention provides a method of manufacturing golf balls composed of a core and one or more cover layer which encloses the core, at least one cover layer being a thin layer having a thickness of 1.0 mm or less. The thin layer is formed to a desired thickness on a surface of a core or spherical body by holding within a mold cavity the core or a spherical body composed of the core enclosed by a cover layer and injecting a synthetic resin material into a space defined by a surface of the core or spherical body and an inner face of the mold cavity so as to form a cover layer on the surface of the core or spherical body, then grinding the resulting cover layer to a thickness of at least 0.1 mm with a specific type of grinder. Golf balls obtained in this way can be provided with a good sphericity even when the cover is formed to a very small thickness.

The present invention discloses the solvent impregnated resin which uses amide compound as the extraction agent. The extraction agent is embedded in the polymer. The prevent invention is characterized in that the polymer is the styrene - divinylbenzene copolymer resin, and the extraction agent is the amide compound with the content of 20 percent to 60 percent. The solvent impregnated resin is ivory ball particle in appearance, with a particle diameter of 60 to 200 items a heap density of 0.53 to 0.94 gram per milliliter, and a specific surface area of 128 to 260 millimeters ² / gram. The present invention also discloses the preparation method for the solvent impregnated resin. The solvent impregnated resin provided by the present invention has the advantages of low cost, less wastage of extraction agent, high column load, good mass transfer performance, easiness to be regenerated, long service life, ease use, good repeatability, and high reproducibility and so on. The solvent impregnated resin is of the characteristics of both particle and liquid in terms of extraction and cleaning. The present invention can be widely used in the separation and analysis of ⁹⁰Sr in the plant and the animal samples, in the removal and callback of ⁹⁰Sr during the treatment of nuclear fuel high-level radioactive liquid waste, as well as in the separation, purifying and callback of radioactive medical isotopes ⁹⁰Sr.

The invention provides a polystyrene/calcium alginate composite gel microsphere in a nuclear shell structure and a preparation method thereof, relating to biopolymer materials. The polystyrene/calcium alginate composite gel microsphere in the nuclear shell structure takes a polystyrene microsphere as a core and calcium alginate gel as a shell, wherein the grain size of the core is 1-100 microns, and the thickness of the shell layer is 50-800 nm. The preparation method comprises the following steps of: mixing polystyrene microsphere with aqueous solution containing a surface active agent I, and carrying out ultrasonic emulsification to obtain mixed solution A; adding sodium alga acid solution in the mixed solution A, and stirring to obtain mixed solution B; adding organic solution containing a surface active agent II into the mixed solution B, and stirring to obtain mixed solution C; adding calcium chloride solution which has the same volume with the sodium alga acid solution into the mixed solution C under stirring to react, and carrying out vacuum filtration, washing the solution until no calcium ion residue exists on the surface and drying to obtain a product D; and dispersing the product D into water, centrifuging the mixture, pouring out supernate and taking out precipitate to obtain the product.

The invention discloses a preparation method of a porous carbon microsphere. The preparation method comprises the following steps: subjecting o-dihydroxybenzene and formaldehyde to carry out polymerization reactions in a silica sol solution under the catalytic action of acid so as to obtain compound microspheres of o-dihydroxybenzene-formaldehyde resin-oxidized nano particles, and then subjecting the compound microspheres to the processes of carbonization and silicon oxide removing so as to obtain porous carbon microspheres with a even particle size. The size of the porous carbon microsphere is in a micron scale range; the porous carbon microsphere has a good spherical shape and a rough surface, is rich in medium holes with a size of 10 to 40 nanometers, integrally has two hole structures, namely the medium hole and the micro hole, and has a large specific surface area. The porous carbon microsphere has a high purity, and the carbon content can reach 95% or more.

The invention belongs to a preparation method of nuclear fuel, and concretely relates to a preparation method of thorium-uranium mixed oxide ceramic microspheres. The method uses an internal gelation method, and comprises using an acid-lacking uranyl nitrate solution and thorium nitrate as raw materials, preparing sol, dispersing gelling, washing, drying, calcining and reduction sintering to prepare ThO2-UO2 microspheres with a diameter of 0.05-0.20 mm. The ThO2-UO2 microspheres has outstanding advantages of smooth surface, good sphericity, compact inside, uniformly distributed thorium, and a density being greater than 96.8% TD; and the method is simple, and can prepare the thorium-uranium mixed oxide ceramic microspheres with different thorium contents.

The invention discloses a method for preparing a precursor of a positive material of a nickel manganese cobalt multi-element lithium ion battery. The method comprises the following steps of: firstly, dissolving nickel, cobalt and manganese with deionized water, and preparing a multi-element metal salt solution with the total metal ionic molar concentration between 0.8 and 2.5mol/L, wherein the molar ratio of nickel to cobalt to manganese elements in the multi-element metal salt solution is (0-1):(0-1):(0-1); secondly, preparing alkali solution with concentration between 2 and 4mol/L; thirdly, reacting the salt solution with the alkali solution, wherein the temperature is controlled to be between 40 and 70 DEG C and the stirring speed is controlled to be between 100 and 600 revolutions/min, and the adding speed of salt and alkali solutions is controlled, so that the pH value of the reaction system is controlled to be between 8 and 11; and continuously stirring for 30 minutes to 2 hours after the reaction is completed, standing for 2 to 4 hours, filtering to obtain solid matters, and washing with deionized water until the content of Na<+> is lower than 0.03 percent, and drying to obtain the required precursor of the positive material of the nickel manganese cobalt multi-element lithium ion battery. According to the invention, an ammonia complexing agent is not used, and the method has the advantages of no ammonia or nitrogen pollution risk, good product sphericity, uniform granules, narrow granularity distribution and the like.

The invention relates to a water-soluble quantum dot fluorescent nanosphere and a preparation method thereof. The preparation method comprises the following steps of: grafting alkylamine on a side chain of a hydrophilic polymer of polyacrylic acids to prepare an amphipathic polymer; and coating the amphipathic polymer on the surface of a quantum dot by using a reaction system of water/an emulsifying agent/the amphipathic polymer/oil through a phase transfer method to obtain a fluorescent nanosphere with the quantum dot coating quantity of 10-80, the uniform grain size of 30-300nm and favorable dispersibility. The water-soluble quantum dot fluorescent nanosphere is good in fluorescence and colloid stability, capable of being stored for a long term, rich in carboxyl on the surface, capable of being coupled with an antibody and other amino-contained biomolecules such as antibodies, nucleic acids, enzymes, amino acids and even amino-contained inorganic molecules, easy in operation of coupling reaction of carboxyl and amino, high in connection efficiency, simple in preparation process and suitable for large-scale production.

The invention discloses a hydrogel@gold nanocomposite and a preparation method and application thereof. The hydrogel@gold nanocomposite is composed of one or more core-shell structure units, and each core-shell structure unit is of a core-shell structure with hydrogel microspheres serving as the core and a gold nanosphere layer serving as the shell. The diameter of each gold nanosphere is 30-60 nm, and the diameter of each hydrogel microsphere is 5-200 micrometers. The preparation method includes the steps that the microfluidic chip technology is adopted to prepare the P(AAm-co-AAc) hydrogel microspheres; chloroauric acid is reduced in ethanediol to prepare the gold nanospheres; the gold nanospheres are transferred into water and mixed with the P(AAm-co-AAc) hydrogel microspheres, the mixture is subjected to standing for 12-48 h, and the hydrogel@gold nanocomposite is obtained. According to the hydrogel@gold nanocomposite and the preparation method and application thereof, the properties of a gold nanomaterial and hydrogel can be effectively exerted, the SERS effect can be substantially enhanced, and the sensitivity of SERS detection can be improved, and the detection capability on low-concentration molecules can be improved.

The invention relates to a method for preparing a gelatin microballoon embolization agent, which comprises the following steps of dissolving gelatin or mixture of gelatin and medicine at 30-70 DEG C, filtering to obtain gelatin solution with 15%-60% of solid content, adding gelatin solution into oil phase liquid paraffin with mass ratio of 1%-2% of stabilizer Span 80, wherein the volume ratio of water and oil is 1/1-1/10, stirring for 15 minutes by 200-800r/min, adding cross-linking agent aldehyde compound with mass percent of 2%-50% at low temperature of 0-10 DEG C, solidifying for 1-2 hours, washing or drying the cross-linking agent to obtain the microballoon embolization agent after freeze drying or dehydration. The method has the beneficial effects that the gelatin microballoon embolization agent has certain elasticity and expansibility, the surface is smooth, the sphere is obvious, the size and the shape of the sphere is uniform, the grain size is controllable, clinical embolization effect can be improved, and side effect can be lowered, the clinical controllability is strong, antitumor drug can be added into the microballoon in manufacture process, so that double therapeutical effect of medicine treatment and embolization can be realized. The gelatin has good biocompatibility and biodegradablity, and clinical safety can be guaranteed.

The invention discloses a method for emulsionizing outer gelation and preparing sodium alginate/chitosan slow release micro-capsule in one step. The current preparation method of calcium alginate gel by internal gelation has defects that small parts of the calcium salt granules cannot be richly reacted with glacial acetic acid and remained in the sodium alginate calcium beads, the encapsulization materials are easily lost and the wrapping rate is low due to the calcium salt is difficult to evenly disperse. The invention uses the sodium alginate liquor as the disperse phase, the edible plant oil as the disperse medium and the sorbitan monooleate as the surfactant to emulsionize small liquid drops wrapped with oil; calcium chloride chitosan liquor is used for initiating the gelation reaction of the sodium alginate so as to generate sodium alginate/chitosan slow release micro-capsule; the oil remained on the surface is eliminated by a oil removing device with precipitation self-drifting method. The invention elevates the micro-capsule medicine contents and the wrapping rate.

The invention discloses a positive electrode material of a high-capacity lithium ion battery and a preparation method of the positive electrode material. The preparation method comprises the following steps: dissolving raw materials into de-ionized water to prepare a mixed solution A and a mixed solution B, which have the same volume and different concentrations; adding a sodium hydroxide solution and an ammonia water solution into a container C in a parallel flow manner to be subjected to co-precipitation, so as to prepare a co-precipitate Ni1-x-yCoxAly(OH)2+y precursor; after ageing, filtering, washing and drying the prepared co-precipitate precursor, uniformly mixing the co-precipitate precursor with a lithium source; pressing and molding mixed materials, putting the mixture into a pipe furnace for presintering, and sintering the mixture in an oxygen/oxygen-enriching air airflow to obtain a target product. The positive electrode material of the lithium ion battery, provided by the invention, has no impure phases and has high crystallization quality; the product has a uniformly-distributed grain diameter and a regular spherical shape, and has a very high specific discharge capacity and relatively excellent circulating stability; the positive electrode material can meet high-energy density and high-power charging and discharging requirements, a process is simple and a manufacturing cost is relatively low.

The invention provides a method for preparing a lithium titanate material. A certain quantity of lithium-containing compound, titanium-containing compound and additive are weighed, and a certain amount of deionized water and dispersion agent are added for primary dispersion; moisture is removed after drying to obtain solid 1; then the obtained solid 1 is roasted in air to obtain a primary battery material; a certain quantity of carbon-containing wrapping material and additive are weighed and dispersed in water, the primary battery material is added for secondary sufficient mixing, moisture is moved after drying, and solid 2 is obtained, finally the obtained solid 2 is roasted in the inert or reduction atmosphere, and the graphene-wrapped battery material containing a certain amount of additive is obtained. Due to two times of dispersion and roasting, it is guaranteed that the carbon-containing wrapping layer covers the surface of lithium titanate in a sufficiently uniform and compact mode and is not prone to being damaged or falling off, and accordingly the defect of insufficient wrapping is overcome. Due to use of the additive, conductivity of a lithium titanate body is improved, rate capability of the lithium titanate material is improved, conductivity is high, and gas generation is prevented.

The invention discloses a double-layer sustained and controlled release nanoparticle and a preparation method thereof and application in preparation of antitumor medicines. The double-layer sustained and controlled release nanoparticle is formed by a lactic acid-glycolic acid copolymer nanoparticle inner core and a polyethylene glycol questin grafting chitosan casing covering an outer layer of the lactic acid-glycolic acid copolymer nanoparticle inner core and can simultaneously load hydrophilic and lipophilic medicines. The drug entrapment rate is high, time-ordered release of inner layer medicines and outer layer medicines can be achieved, the double-layer sustained and controlled release nanoparticle has the effects of sustained release and controlled release, and in addition, the double-layer sustained and controlled release nanoparticle further has the advantages of being controllable in grain size, uniform in particle size distribution, smooth and round in forma and good in stability and dispersibility and the like.

The invention relates to a highly cross-linked monodisperse epoxy-group-containing polymer microsphere and a preparation method thereof. The microsphere contains an epoxy group, methacrylic acid glycidyl ester is used as a monomer, divinyl benzene (DVB) is used as a cross-linking agent, and the microsphere is obtained through polymerization; the particle size of the microsphere is 2 to 10 [mu]m, and the polydispersity index is 1.04 to 1.07. The preparation method comprises the following steps: (1), methacrylic acid glycidyl ester, the DVB and an initiating agent are together added into a solvent for uniform mixing, after nitrogen is introduced, sealing is performed, the reaction temperature is controlled to be 82 to 90 DEG C, and the reaction time lasts for 3 to 5 hours; (2), a reaction product obtained in the step (1) is washed and dried, so that the polymer microsphere is obtained. The polymer microsphere prepared by the invention contains the epoxy group, the epoxy group is an active group, derivative reaction is facilitated, and the problems of high hydrophobicity, high probability of non-specific adsorption can be solved.

The invention discloses a shell-core alpha-totaxin microcapsule and a preparation method thereof. An O/W/O liquid drop template is prepared by adopting a microfluidics splitter through taking alpha-totaxin as a core material and adding a dilutent and taking sodium alginate as a wall material. The number of core materials wrapped by the microcapsules can be controlled by regulating the internal andexternal phase flow rate, and the spherical shape of a shell layer can be kept well by adopting curing means of combining internal and external gelatinization. The Finner and Fmiddle flow rate are constant, the Fouter flow rate is regulated so as to control the number of the core materials wrapped in the shell-core microcapsules, the alpha-totaxin microcapsule with uniform grain size and a shell-core structure, and the cured liquid drop can keep good sphere through combining the internal and external gelatinization.

The invention discloses a method for recycling ultrafine copper powder from waste liquid containing complexing copper, and belongs to the technical field of chemical engineering recycling. According to the technical scheme, the method for recycling the ultrafine copper powder from waste liquid containing the complexing copper comprises the steps of adding a pvp dispersing agent in the waste liquid containing the copper, then adding glucose and NaOH, conducting heating and stirring to conduct a prereduction reaction, after the reaction, adding thiourea dioxide, conducting heating and stirring to conduct a reduction reaction, after the reaction is finished, conducting filtering, conducting washing for two times, conducting ethyl alcohol washing for two times, conducting vacuum drying, and obtaining the ultrafine copper powder. According to the method for recycling the ultrafine copper powder, the copper removal rate is 99%, the granularity of the recycled and obtained ultrafine copper powder can be 700nm-1500nm, the purity of the produced copper powder can be more than 99.95%, and the prepared ultrafine copper powder is applied to a plurality of fields of conducting resin, conductive coatings, conductive composite material raw materials, high-performance catalysts, lubricant additives, nanocrystalline copper, medicines and the like.

The invention discloses a doped high-nickel high-voltage NCM positive electrode material and a preparation method thereof, and belongs to the field of lithium ion batteries. The preparation method comprises the following steps: simultaneously doping manganese and cobalt to obtain an NCM precursor; and adding a dopant M into the precursor, and sintering the precursor in a high-pressure oxygen atmosphere to obtain a lithium ion battery positive electrode material. The positive electrode material has very high specific discharge capacity and excellent cycling stability, can meet the high-rate charging and discharging requirement, and can achieve long-life safe cycling under high voltage. The positive electrode material is prepared by combining four-solution parallel-flow co-precipitation witha high-pressure solid-phase synthesis method, and the prepared product has the advantages of high purity, high crystallization quality, high particle density, uniform distribution of particles, excellent electrochemical performance and low manufacturing cost, is an ideal positive electrode material with high energy density, and has a wide application prospect.