164results about How to "Guaranteed particle size" patented technology

The invention discloses a method for preparing metal powder based on plasma atomization technology and a device thereof. The device includes a feeding chamber, an induction heating melting chamber, a plasma torch chamber, an atomization chamber and a powder collection chamber, and an induction heating device and a magnetic restraint device are arranged in the induction heating melting chamber. Frequency smelting technology, magnetic levitation technology and plasma atomization preparation technology are combined to maximize the effect of plasma atomization technology to prepare high-sphericity and high-quality metal particles. Compared with traditional plasma atomization preparation technology, it is guaranteed Under the premise of the sphericity and particle size of metal particles, the production volume of high melting point metal powder can be increased exponentially.

The invention discloses a mobile vibration reduction type high-precision flour milling device. The device comprises a flour milling box; a funnel-shaped milling cavity is formed in the flour milling box; a milling cone is arranged in the milling cavity; a working gap is reserved between the milling cone and the milling cavity; the milling cone is driven to operate by a flour milling motor mounted at the bottom of the flour milling box; a driving crushing roller and a driven crushing roller with opposite positions are mounted above the milling cone in the flour milling box; a feeding hopper for feeding is arranged at the top of the flour milling box; an unloading channel communicating with the milling cavity is formed below the milling cavity; and the unloading channel is kept communicating with a discharge channel for discharging. The device has the following beneficial effects: cut materials can be renewedly fed from the feeding hopper by a return auger for crushing and flour milling again, so that the particle size of final finished products can be effectively guaranteed, and the flour milling quality is improved; and the device is convenient to move, meanwhile, is excellent in vibration reducing effect, and can be widely applied to fine grinding of materials.

The invention belongs to the technical field of plastics modification and particularly relates to a modified polypropylene material for a high-performance thin-wall automobile door panel and a preparation method thereof. The material is prepared from, by mass, 5%-10% of homopolymerized PP, 20%-30% of first copolymerized PP, 15%-25% of second copolymerized PP, 12%-18% of toughening agent, 1%-2% of compatilizer, 0.4%-0.6% of antioxidant, 0.2-0.4% of weather resistance agent, 3%-6% of melting index regulator, 20%-25% of mineral enhancer, 1.5-3% of scratch resistant agent and 1-2% of other assistants. The preparation method of the modified polypropylene material comprises the steps of mixing, extrusion and granulation. The material prepared by adopting the preparation method has high liquidity, rigidity and toughness, can well meet the usage requirements of the thin-wall automobile door panel and is low in cost. Compared with the prior art, a high-liquidity allyl elastomer is used as the melting index regulator, the liquidity of the material is remarkably improved, and the thin-wall door panel forming requirements are met. In addition, high-liquidity polypropylene and a low surface energy polymer are used in a mixed mode, and the tiger skin stripe defects on the surface of the thin-wall door panel can be basically eliminated.

The invention provides a titanium and aluminum based alloy powder material for additive manufacturing. The titanium and aluminum based alloy powder material is prepared from the following raw materials in percentage by atom: 47 to 56 percent of Al, 1.6 to 2.3 percent of Cr, 1.6 to 2.0 percent of Mo, 0.6 to 1.2 percent of TiB2 and the balance of Ti and unavoidable impurity. In addition, the invention also provides a method for preparing the alloy powder material. The method comprises the following steps of I, protecting the inner wall of a graphite flow guiding pipe by adopting a ceramic flow guiding inner core; II, preparing high-temperature-preventing carbonized coatings at the end surfaces of the graphite flow guiding pipe and then loading the graphite flow guiding pipe into a smelting chamber; III, preparing an ingot blank by adopting vacuum self-consuming arc smelting; IV, smelting to prepare an alloy melt by adopting a water-cooled copper crucible; V, carrying out atomization treatment, so that the titanium and aluminum based alloy powder material for the additive manufacturing is obtained. The alloy powder material is an alloy system designed for the additive manufacturing process and various properties of a product manufactured through the additive manufacturing technique by adopting the alloy powder material can reach expected effects.

The invention discloses a cationic-nonionic water-based polyurethane-polyacrylate composite emulsion and a preparation method thereof. The polyurethane resin has the defects of poor water resistance of the coated film and lower mechanical strength than the acrylic resin; and the polyacrylic resin has the defects of poor resistance to organic solvents, high tendency to sticking at high temperature, high tendency to embrittlement at low temperature and the like. The preparation method comprises the following steps: inoculating hydroxyl-terminated acrylate and a sealant into an NCO-terminated prepolymer, adding acetic acid to perform quaternization, and adding deionized water to perform emulsification, thereby obtaining the chemical-bond-combined self-emulsified PU (polyurethane) seed emulsion; and adding an unsaturated hydrophobic monomer and a molecular weight regulator, adding a proper amount of emulsifier to perform pre-emulsification, and finally, adding an initiator to initiate polymerization, thereby obtaining the stable cationic-nonionic water-based polyurethane-polyacrylate composite emulsion. The preparation method is advanced, and can be used for preparing the copolymerized emulsion which has obvious core-shell characteristics and can achieve forced compatibility and molecular synergy on the molecular level.

The invention relates to a preparation method for nano zirconium diboride ceramic powder, which is characterized by comprising the following steps: 1) selecting materials: selecting according to a mol ratio of 1 : 3 to 1 : 5 between Zr and amorphous boron powder in soluble zirconium salt; 2) selecting one of the two methods as follows: a) using a coprecipitation method for gel forming to obtain xerogel; b) using a sol-gel method for gel forming to form the xerogel; 3) preparing precursor powder; 4) synthesizing quickly: arranging the materials into a large current reaction synthesizer; the inside of a black lead reactor is protected by vacuum or insert gases; applying a large current directly on the black lead reactor, quickly heating to 800 and 1500 DEG C at the temperature rising speed of 50 to 500 DEG C/min, preserving the temperature for 0 to 60 minutes to obtain a powder sample; and 5) chemical processing for obtaining the nano zirconium diboride ceramic powder. The method has the characteristics of quick synthesizing speed and high efficiency; the purity of the obtained nano zirconium diboride ceramic powder is high (equal to or more than 95 percent); and the grain diameters of the obtained nano zirconium diboride ceramic powder are uniform and thin(the average grain diameter is equal to or less than 300nm).

The invention discloses a desulfurization and denitration ammonia-removing system. The system comprises an adsorption tower, a desorption tower, a distributor, a first activated carbon conveyer and asecond activated carbon conveyer. One side of the adsorption tower is provided with a smoke inlet A, and the other side of the adsorption tower is provided with a smoke outlet B, the interior of the adsorption tower is provided with an adsorption cavity and an ammonia-removing cavity, the adsorption cavity is installed at one side adjacent to the smoke inlet A, the ammonia-removing cavity is installed at one side adjacent to the smoke outlet B, the first activated carbon conveyer is connected with a discharging port of the adsorption tower and a feeding port of the distributor, the second activated carbon conveyer is connected with a discharging port of the desorption tower and a feeding port of the adsorption cavity, a discharging port of the distributor is respectively connected with a feeding port of the ammonia-removing cavity and a feeding port of the desorption tower. The system adopts a mode that the adsorption tower is divided to two functional areas. The adsorption reaction cavity is capable of achieving the functions of desulfurization, denitration, dust removal and the like. The ammonia-removing cavity is filled with fresh activated carbon or acidic activated carbon, andis capable of gathering ammonia in smoke passing through an adsorption reaction layer, and effectively preventing the ammonia at the outlet from escaping.

The invention provides a preparation method modified calcium carbonate. The preparation method includes: mixing and crushing calcite and talcum, performing dry grinding to obtain raw slurry with solid content being 70-75%, performing constant-temperature stirring and grinding to obtain processed slurry with average particle size being 0.9-1.1 micrometers, adding naphthalene sulfonate type anti-precipitation agent and anionic surfactant into the processed slurry to perform liquid-phase dispersing, drying, collecting, depolymerizing and dispersing, adding brightener and liquid surface modifier to perform wrapping treatment, and stirring to obtain the modified calcium carbonate. By the preparation method, the modified calcium carbonate which is good in printing performance, good in dispersity, good in surface brightness and applicable to films adhered to car bodies can be prepared.

The invention discloses a preparation method of nano calcium carbonate for MS glue, which comprises the following steps: removing impurities from calcium hydroxide (Ca (OH) 2) slurry obtained after the digestion reaction of quicklime (CaO) and water (H2O), preserving heat and aging, adding a crystal form control agent, performing primary carbonization synthesis reaction with the washed kiln gas containing carbon dioxide (CO2), adding a post-treatment agent, aging for a certain time, performing secondary carbonization synthesis reaction with the washed kiln gas containing carbon dioxide (CO2) to obtain calcium carbonate (CaCO3) cooked slurry, adding a modifier into the cooked slurry, performing filter pressing dehydration, drying, crushing and grading after the reaction is finished to obtain the nano calcium carbonate for MS glue. The nano calcium carbonate crystal prepared by the method is a standard cube, and the crystal is mono-disperse, and the average particle diameter is only 100-150nm, and the specific surface area is 16-18m <2 >/g, and the nano calcium carbonate crystal is used for MS glue, and the thixotropy is good, and the extrusion property is good, and the storage stability is good, and the surface finish after gluing is good, and the tensile strength is high, and the elongation is high and the bonding property is also good. The preparation method of nano calcium carbonate for MS glue has the advantages of simple and feasible process, low cost, low price and better economic benefit.

The invention discloses a crushing type blockage prevention device which relates to a blockage prevention device for a sewage heat exchange system and aims to solve the problems of incomplete filtration, miscellaneous clearing operation, big temperature difference loss of the water source and high operating cost in the prior art in the process of processing big-grain sundries contained in the sewage which enters the equipment such as heat exchange equipment. The crushing type blockage prevention device comprises a fixed outer cylinder, a rotary inner cylinder, a shell barrel, a driving device, a plurality of inner blades and equal number of outer blades. The rotary inner cylinder and the fixed outer cylinder are respectively arranged inside the shell barrel; the fixed outer cylinder is sleeved outside the rotary inner cylinder; the driving device is arranged on the upper end face of the shell barrel; the inner blades are distributed on the outer circumferential side face of the rotary inner cylinder; the outer blades which are equal in number with the inner blades and correspond with the inner blades one by one are distributed on the inner circumferential side face of the fixed cylinder; and the rotation direction of each inner blade which takes the shape of a right-handed spiral cylindrical plane is opposite to the rotation direction of the corresponding outer blade. The crushing type blockage prevention device is used for processing the big-grain sundries contained in the sewage which enters the heat exchange system.

The invention discloses a method for preparing nitrogen oxide phosphor powder. Salt and nitride of a metal component in the nitrogen oxide phosphor powder to be prepared are taken as raw materials, and the method comprises the following steps of: weighing the raw materials according to the stoichiometric proportion of the phosphor powder to be prepared, and dissolving the raw materials in water to prepare first suspension; adding a dispersant polyethylene glycol into the first suspension, fully dispersing the dispersant to prepare second suspension, and controlling the volume ratio of the dispersant to the first suspension to be 5-8:100; dropping ammonia water into the second suspension to make the pH value of the second suspension be 5-6; ultrasonically oscillating the second suspension in ultrasonic waves to prepare uniform and stable third suspension; putting the third suspension into a heating furnace, and performing thermal treatment at the temperature of between 500 and 600 DEG C for 2 to 3 hours to prepare precursor powder; and putting the precursor powder into a crucible, and calcining in the reducing atmosphere at the temperature of between 1,300 and 1,400 DEG C for 4.5 to 7 hours to prepare the required phosphor powder.

The invention provides an automatic sand drying machine which comprises a drying chamber and a screening chamber. An air outlet and a sand inlet with a humidity sensor are arranged at the top of the drying chamber, a microcontroller and two opposite air inlets are formed in the side wall of the lower portion of the drying chamber, one air inlet is connected with a first air heater, the other air inlet is connected with a second air heater, the microcontroller is electrically connected with the humidity sensor, the first air heater and the second air heater, and ventilating dense screens inclined downwards are arranged on two opposite side walls in the drying chamber in a staggered mode. A coarse sand outlet and a fine sand outlet are arranged at the bottom of the screening chamber, a screen body and a vibration motor are arranged in the screening chamber, the screen body comprises a screen mesh and a flow guide plate, the screen mesh is obliquely arranged on the upper layer, the flow guide plate is located on the lower layer oppositely to the inclination direction of the screen mesh, and the vibration motor is connected with the flow guide plate. Drying equipment and screening equipment are arranged to a whole, sand can be automatically dried and screened after being added to the machine, equipment cost is lowered, and the production procedure is simplified.

The invention discloses an industrial production method for preparing superfine high-purity alpha-alumina. The industrial production method comprises the following steps that: (1) boehmite is dispersed in unitary organic acid; (2) an obtained dispersing agent of the boehmite is filtered; (3) the dispersing agent of the boehmite is subjected to solid-liquid separation, washing and redispersion; (4) the dispersing agent with impurities being removed is subjected to spray drying; and (5) the dried boehmite obtained in the step (4) is subjected to high-temperature calcination. According to the invention, the purity and the grain size of the produced alpha-alumina are well guaranteed, and the purity and the grain size of a final product can reach the using requirements in a high-end electronic industry.

The invention aims to industrially produce ginkgolide B liposome medicinal composition injection and ginkgolide B liposome medicinal composition oral preparations through uniform formula, process and equipment by a molecule dispersing method. The invention provides a molar ratio formula of the component raw materials for preparing the ginkgolide B liposome medicinal composition, steps and method for preparing ginkgolide B liposome medicinal composition freeze-dried injection and oral preparations, and embodiments for preparation. The ginkgolide B liposome medicinal composition is used for treating cerebral and vascular diseases.

The invention discloses a preparing method for solid quantum dots and belongs to the field of light-emitting materials. The method comprises the steps that a quantum dot solution is prepared; after the quantum dot solution and metal hydroxide sol are mixed according to the mole ratio of 1:1000-20:1, precipitate is generated; solid-liquid separation is carried out on the precipitate to obtain precipitate, and the precipitate is dried in a frozen mode to obtain the solid quantum dots. According to the method, metal hydroxide is added into the quantum dot solution, the quantum dot solution can generate flocculent precipitate, and the precipitate can stop quantum dot nanometer particles from gathering; solid-liquid separation is carried out on the precipitate, the precipitate is dried in the frozen mode to obtain the solid quantum dots, in the freezing and drying processes, gathering of the quantum dots can be prevented, the morphology and the grain diameter of the quantum dot particles are kept unchanged, and therefore it is ensured that the solid quantum dots have high light-emitting efficiency.

According to the invention, a liposome combination drug injection and an oral liposome combination drug preparation can be produced in a large industrialization manner through a molecular dispersion method with a unified formula, a unified process and unified equipment. The invention provides a formula of raw components for preparing liposome combination drugs in a molar ratio, provides freeze-drying injection and oral preparation processes for the prepared liposome combination drugs, and also provides twenty embodiments for preparing the liposome combination drugs, such as an anti-gastric-ulcer liposome combination drug, antibacterial and antifungal liposome combination drugs, an anti-tumor liposome combination drug, an anti-virus liposome combination drug, an anti-emetic liposome combination drug, a nutritional supplement liposome combination drug and hypoglycemic agent and cardiovascular medicine liposome combination drugs.

The invention discloses a tea powder grinding machine. The bottom of a machine case is communicated and provided with a base; a feeding groove is communicated and arranged in the top of the machine case; a material crushing device and a grinding device which are mutually communicated are arranged in the machine case from top to bottom; the crushing device and the grinding device are in coaxial arrangement and are respectively in transmission connection with a driving motor arranged in the base through a transmission shaft A; a feeding opening is formed in the bottom of the feeding groove; thefeeding opening is positioned above the material crushing device; a material containing notch used for placing a material container is arranged at the side wall of one side of the base; a dischargingopening communicated with the machine case is arranged on the top surface, positioned in the material containing notch position, of the base. Through the structure, the tea powder grinding machine hasthe advantages that the tea is fast crushed into crushed materials; then, the crushed materials are directly ground into powder; material discharging is performed; the tea grinding efficiency and grinding effect are improved.

The invention relates to acrylic acid polymer emulsion for industrial protective finish paint, and belongs to the technical field of acrylic acid polymer emulsion. The acrylic acid polymer emulsion is prepared from an emulsion polymer A with the particle size being 5 to 25nm and an emulsion polymer B with the particle size being 95 to 105nm through being metered in percentage by weight, wherein the emulsion polymer A is prepared from the following ingredients in parts by weight: 100 to 250 parts of methyl methacrylate, 30 to 100 parts of styrene, 30 to 60 parts of n-butyl acrylate, 50 to 150 parts of 2-ethylhexyl acrylate, 5 to 20 parts of crosslinking monomers, 3 to 8 parts of methacrylic acid, 460 to 640 parts of water, 18 to 35 parts of reactive anion emulsifiers containing EO chain segments, 2.3 to 4.9 parts of persulfate, 2 to 8 parts of octanol, 0.5 to 3 parts of antifoaming agents and 0.8 to 2 parts of sterilization agents; the emulsion polymer B is of a core shell emulsion structure and is prepared from the following ingredients in parts by weight: 395 to 495 parts of water, 1 to 3 parts of reactive anion emulsifiers containing EO chain segments, 1 to 2.6 parts of persulfate, 335 to 761 parts of shell layer pre-emulsion, 345 to 834 parts of core layer pre-emulsion, 1 to 3 parts of sterilization agents and 1 to 3 parts of antifoaming agents. The invention also discloses a production process of the emulsion. The emulsion does not contain APEO (alkylphenol ethoxylates); the production stability is high.

The invention provides nano-suspension of a difficult-to-dissolve medicine as well as a preparation method and application of the nano-suspension. The nano-suspension is prepared from the following components: 10 to 15 parts of a stabilizer, 40 to 50 parts of difficult-to-dissolve medicine granules and the balance of water, wherein the stabilizer comprises a non-ionic stabilizer and an ionic stabilizer; the preparation method comprises the following steps: preparing raw materials according to the ratio; adding the stabilizer and the difficult-to-dissolve medicine granules into the water in sequence and stirring to obtain primary suspension; adding grinding beads and the primary suspension into a grinding pot in sequence and then putting the grinding pot into a grinding machine and grinding, so as to obtain the nano-suspension of the difficult-to-dissolve medicine. By adopting the nano-suspension of the difficult-to-dissolve medicine provided by the invention, the defects of existing nano-suspension that the stabilizer is not properly selected and the type is single, granule conglomeration and sedimentation of the nano-suspension are easy to occur so that the storage time is short are overcome; the nano-suspension of the difficult-to-dissolve medicine is used for preparing nano-suspension lyophilized powder and the nano-suspension is convenient to transport and preserve.

The invention provides a preparation method of n-zinc titanate powder and application and belongs to the technical field of thermal control coatings of spacecrafts. The preparation method comprises the following steps: performing a co-precipitation reaction on zinc chloride and butyl titanate with a weak acid; after the co-precipitation reaction is completed, putting ammonium hydroxide into the reaction system provided by the step 1, implementing neutralization, filtring, and drying so as to obtain a precursor; performing high-temperature sintering on the precursor, thereby obtaining the n-zinc titanate powder. By adopting the preparation method of the n-zinc titanate powder provided by the embodiment of the invention, butyl titanate is adopted as a titanium source, n-zinc titanate powderwhich is relatively high in purity and small in particle size is prepared, and the powder is relatively low in sunshine absorption rate and good in space environment stability when being used as thermal control packing, and a thermal control coating prepared from the powder is relatively high in hardness and relatively good in stain resistance.