199results about How to "Small particle size" patented technology

The invention discloses a low-cost ammonia-free waterproof emulsion as well as a preparation method and an application method thereof, and belongs to the technical field of cement coatings. Comprising the following steps: mixing and stirring an emulsifier, a monomer and deionized water to obtain a pre-emulsion; adding deionized water into the reaction kettle to obtain a kettle bottom material; adding 0.9% of the pre-emulsion and an initiator a into the kettle bottom material in a stirring state, dropwise adding the rest of the pre-emulsion and the initiator b at the same time after 15 minutes, controlling the pre-emulsion and the initiator b to be dropwise added at the same time, and keeping the temperature after dropwise adding is finished; adding an oxidizing agent and a reducing agent to eliminate residual monomers, then adding a neutralizing agent to adjust the pH value, and adding an auxiliary agent; wherein the emulsifier comprises an anionic emulsifier and a nonionic emulsifier in a mass ratio of (2-3): 1; the monomers comprise styrene, butyl acrylate and functional monomers, and the functional monomers are hydroxyethyl acrylate and beta-acryloyloxypropionic acid. The low-cost ammonia-free polymer cement waterproof coating prepared from the emulsion disclosed by the invention has the advantages of low cost, environmental friendliness, good constructability and excellent mechanical properties.

The utility model relates to the technical field of bubble generator, and disclose a kind of suspended underwater micro-nano bubble generator, including adjustable support mechanism, bubble generating mechanism and external protection mechanism;Bubble generating mechanism is by multistage water pump, inlet pipe, one-way water inlet valve, connecting pump, transport pump, high-speed rotary cutting nanometer bubble pump, conveying pipe and aeration head etc., and is connected by thread seal sleeve to realize pipeline sealing connection.Mainframe box is equipped with buoy, internal and external pressure monitoring sensor, can realize underwater suspension and pressure real-time monitoring.Adjustable support mechanism can adjust equipment installation height, and external protection mechanism is realized waterproof anti-collision protection by protective shell, sealing washer and protective fence.The device adopts multistage water pump to match double high-speed rotary cutting nanometer bubble pump, can accurately control fluid flow rate and pressure, generates bubble particle size uniform, dissolved oxygen efficiency is high, with the characteristics of intelligent control, anticorrosive durable, protective, suitable for water purification, aquatic ecological restoration etc.

The application relates to the technical field of catalysts, and discloses a nano magnesium oxide material and a preparation method and application thereof. The nano magnesium oxide material has a porous structure, wherein the particle size of the nano magnesium oxide is 20-200 nm; and the pore size of the porous structure is 5-45 nm. The classical nucleation growth process of the magnesium oxide is directionally adjusted in a weak alkaline nucleation system, and then the nano magnesium oxide with a controllable grain size distribution is obtained. The nano magnesium oxide material has good catalytic activity in the synthesis of propylene carbonate from CO2 and an epoxide under the conditions of no solvent and no auxiliary agent, and the catalyst is not deactivated after multiple uses, and has good stability.

The invention discloses an emulsion preparation device and an emulsion preparation method using the same, the device comprises a mixer main body, a liquid inlet conduit, a liquid outlet conduit and a feeding assembly, the mixer main body has a three-way flow channel structure, an optional flow channel is a liquid outlet flow channel, the other two flow channels are liquid inlet flow channels, the liquid outlet conduit is communicated with the liquid outlet flow channel, and the feeding assembly is communicated with the liquid inlet flow channel. The liquid inlet guide pipe is communicated with the liquid inlet flow channel, and the feeding assembly is communicated with the liquid inlet guide pipe. The method for preparing the emulsion comprises the steps that the dispersed phase and the mobile phase are obtained, the continuous phase and the dispersed phase are put into the two liquid inlet flow channels of the mixer body through the liquid inlet guide pipes by means of the feeding assembly, the emulsion formed after mixing flows out of the liquid outlet flow channels and is collected, the flow speed ratio of the continuous phase to the dispersed phase is 2: 1-4: 1, and the total flow speed is 60-750 mL / min. According to the scheme, the emulsion with the appropriate particle size is prepared at the low flow speed, the feeding temperature range is wide, the device is simple, the channel dead volume is small, and the device is suitable for both laboratories and industrial production.

The invention belongs to the technical field of solid electrolyte materials, and particularly relates to a garnet type solid electrolyte and a preparation method and application thereof. The D50 of the garnet type solid electrolyte is less than 300nm, and the specific surface area of the garnet type solid electrolyte is 2-30m < 2 > / g. The garnet type solid electrolyte has the beneficial effects that the garnet type solid electrolyte has irregular spherical morphology, good particle dispersity, uniform granularity and relatively small particle size, and has a wide application prospect, especially in the field of lithium ion solid-state battery manufacturing; the preparation method of the garnet type solid electrolyte is high in controllability, simple and convenient to operate and low in manufacturing cost, and the whole preparation reaction process is carried out under low-temperature and normal-pressure conditions, so that the preparation method is energy-saving and environment-friendly.

This invention discloses an internally protruding evaporative swirl fuel supply device and method, relating to the technical field of aero-engine and gas turbine combustion chambers. It includes an evaporator tube body, which is a hollow straight cylindrical structure. The front end of the evaporator tube body has an air inlet and a front inlet, the front inlet for fuel supply and the air inlet for combustion air supply. The rear end of the evaporator tube body has an air outlet. The inner wall surface of the evaporator tube body is provided with a protrusion array, comprising multiple rows of protrusions arranged axially along the evaporator tube body, with each protrusion in each row arranged sequentially circumferentially along the evaporator tube body. Each protrusion protrudes from the inner wall surface of the evaporator tube body into the tube wall, used to tear and break the adhering liquid film into droplets when the oil film flows through the protrusion array. This solves the problem that existing traditional straight-tube evaporator tubes rely solely on airflow shear force to passively tear the liquid film, lacking active film-breaking methods, resulting in significant deterioration of atomization effect under high flow conditions.

The application belongs to the technical field of lithium ion batteries, and particularly relates to a composite aluminum foil current collector, a positive plate and a lithium ion battery. The composite aluminum foil current collector comprises a current collector and a safety coating layer arranged on at least one side of the current collector; the safety coating layer comprises ceramic particles, a conductive agent and a binder. The current collector comprises a polymer material base layer and aluminum layer current collectors arranged on both sides of the polymer material base layer. The positive plate designed by combining the composite aluminum foil with the safety coating layer and assembled with the negative plate and the separator by using the lamination process to obtain the battery cell structure can significantly improve the safety performance of the battery under the mechanical abuse condition, and can smoothly pass the needle puncture and heavy impact tests.

This invention discloses high-entropy rare-earth silicate ceramic nanopowders, their preparation methods, and applications. The preparation method of the high-entropy rare-earth silicate ceramic nanopowders of this invention includes the following steps: 1) dissolving rare-earth oxide powder in an acid solution to prepare a rare-earth salt solution, then adding urea and silica powder and performing a gelation reaction to obtain a gel; 2) igniting the gel for combustion synthesis, grinding, and obtaining a precursor powder; 3) calcining the precursor powder to obtain the high-entropy rare-earth silicate ceramic nanopowders. The high-entropy rare-earth silicate ceramic nanopowders of this invention possess excellent characteristics such as fine particle size, uniform elemental distribution, large component space, and absence of impurities. Furthermore, its preparation method has advantages such as fast synthesis speed, simple equipment, simple and controllable process, and low industrialization cost, making it suitable for application in hot-end components of aerospace engines and possessing very broad application prospects.

This invention provides a food-grade ultramicroemulsion for improving nutrient stability, its preparation method, and its application, relating to the field of food technology. The food-grade ultramicroemulsion of this invention, by weight, comprises the following components: 5-20 parts polyol, 5-30 parts oil, 0.1-2 parts primary emulsifier, 0.01-0.5 parts co-emulsifier, and 60-90 parts water; the primary emulsifier is selected from at least one of polyglycerol fatty acid esters and mono- and diglycerol fatty acid esters; the co-emulsifier is selected from at least one of sucrose fatty acid esters, diacetyl tartaric acid mono- and diglycerides, phospholipids, and citrate fatty acid glycerides. The components are mixed and sheared under mild conditions of 50-65°C, resulting in an emulsion with a narrow particle size distribution, high stability, and high retention rate of fat-soluble nutrients.

This invention discloses a method for preparing zeolite molecular sieves with precisely adjustable particle size, comprising the following steps: (1) adding aluminum source and other raw materials to deionized water and stirring evenly at room temperature; (2) adding silicon source, stirring at room temperature, and then adding template agent to obtain precursor slurry; (3) adding zeolite molecular sieve, the amount of zeolite molecular sieve being 1-15 mg / g of precursor slurry, transferring the precursor slurry to a high-pressure reactor, fixing it on a homogeneous reactor, heating to 0-150℃, maintaining for 1-200 h, and then heating to 160-230℃ for 3 hours to crystallize for 6-96 h; (4) obtaining zeolite molecular sieve after centrifugal washing, drying, and calcination. The innovation of the preparation method of this invention lies in the first use of a two-stage synthesis method, which can gradually reduce the particle size of the zeolite molecular sieve product while increasing the yield of zeolite molecular sieves. This method successfully synthesized SAPO-34 zeolite molecular sieve with a particle size deviation of less than 0.4 μm and ZSM-5 zeolite molecular sieve with a particle size deviation of less than 0.2 μm.

The application relates to a preparation method of a nano WC-Co-based composite powder with inhibitor uniform distribution, and belongs to the technical field of powder preparation. In the application, tungsten oxide and cobalt oxide with large brittleness are used as raw materials, the raw materials are easily broken in a ball milling process, the superfine and nano particle size of a precursor mixed powder containing an inhibitor and the uniform distribution of the raw materials are ensured, the precursor of the inhibitor is dissolved in anhydrous ethanol, a solution is formed, and the solution is mixed with other raw materials, so that the uniform distribution of the component of the inhibitor element in the precursor mixed powder containing the inhibitor is ensured. Polyethylene glycol is added in the ball milling process, the agglomeration of powder particles is reduced, the friction between the powder particles is reduced, and the flowability of the particles is increased. Through the matching of precursor components, the density of the mixed powder of the inhibitor-containing compact and a stage-by-stage heating process, the full reaction of the compact is ensured, the rapid discharge of generated gas is ensured, and through the further ball milling treatment of the prepared powder, the powder is ensured to have the characteristics of pure phase, small WC particle size and uniform component distribution.

The invention provides coated acetylene carbon black, which is characterized in that a core is silicon carbide, and a coating layer is acetylene carbon black. The invention also provides a preparation method of the coated acetylene carbon black, which comprises the following steps: atomizing organic silicon liquid, and hydrolyzing at high temperature to obtain silicon dioxide particles; uniformly mixing the silicon dioxide particles with acetylene gas, and reacting at 1200-1500 DEG C to obtain silicon carbide particles; the preparation method comprises the following steps: uniformly mixing silicon carbide particles with acetylene gas, and reacting at 900-1100 DEG C to obtain a silicon carbide-carbon black core-shell composite material, namely the coated carbon black. Compared with the traditional carbon black, the coated acetylene carbon black prepared by the invention has the advantages that the structural degree and the mechanical strength are obviously improved, the coated acetylene carbon black is difficult to pulverize in the repeated charge-discharge or cold-hot cycle process, and the service life can be prolonged. The coated carbon black prepared by the preparation method disclosed by the invention is relatively small in particle size, relatively high in uniformity and not easy to agglomerate.

The invention relates to a preparation method and application of a nucleating agent. The preparation method comprises the following steps: mixing solvent pure water, calcium hydroxide and fatty acid methyl ester sulfonate, and heating; dropwise adding hexahydrophthalic anhydride into the mixed solution, and after dropwise adding is completed, carrying out heat preservation reaction to obtain the calcium hexahydrophthalate. The product has excellent performance when used for thermoplastic resin such as polyolefin.

This invention discloses a two-step hydrothermal method for preparing nickel-iron bimetallic MOF derivatives and its application. By controlling the precursor structure through a two-step hydrothermal strategy, the nickel-iron bimetallic MOF derivative catalyst forms a foam-like hierarchical porous carbon framework. The metal nanoparticles are uniformly dispersed, small in size, and encapsulated by carbon layers, significantly improving the specific surface area and accessibility of active sites. It exhibits excellent hydrogen yield and anti-carbon deposition performance in plastic pyrolysis tar reforming. The synergistic effect of nickel and iron electrons effectively inhibits metal sintering and carbon deposition, and has good catalytic stability. This invention solves the problem in existing nickel-iron bimetallic MOF derivatives where phase separation easily occurs in one-step synthesis due to the difference in nucleation and growth rates between nickel and iron ions and organic ligands, leading to uneven metal distribution, increased particle size, underdeveloped pore structure, and low accessibility of active sites, thus affecting catalytic reforming activity and anti-carbon deposition ability.

The application discloses high-entropy rare earth silicate ceramic nano powder and a preparation method and application thereof. The preparation method of the high-entropy rare earth silicate ceramic nano powder comprises the following steps: 1) dissolving rare earth oxide powder in an acid solution to prepare a rare earth salt solution; 2) mixing the rare earth salt solution and a sodium silicate solution, adding ammonia water to perform chemical co-precipitation, then performing standing and aging, and then taking the precipitate to perform drying to obtain a precursor powder; and 3) placing the precursor powder under the condition that the temperature is 1100 DEG C to 1200 DEG C to perform calcination. The high-entropy rare earth silicate ceramic nano powder has excellent characteristics such as small particle size, uniform element distribution, large component space and no impurity phase, and the preparation method has the advantages of low synthesis temperature, simple equipment, simple and controllable process, low industrialization cost and the like, is suitable for being used on a hot end part of an aerospace engine and has a very wide application prospect.

A peony seed crushing and oil pressing device relates to the technical field of peony deep processing and comprises a crushing unit, a bagging unit and an oil pressing unit. The crushing unit comprises a crushing hopper, and a pair of tooth rollers for crushing peony seeds are arranged in the crushing hopper; the bagging unit comprises a screw conveyor, a cloth bag is arranged at the output end of the screw conveyor, and the screw conveyor is used for conveying the crushed peony seeds into the cloth bag; the oil pressing unit is provided with a pair of oil pressing rollers used for pressing the cloth bag. The peony seed crushing and oil pressing equipment is provided with the crushing unit, and the crushing unit has the advantages of being high in crushing efficiency and small in crushing particle size. The peony seed crushing and oil pressing equipment is further provided with a bagging unit, the bagging unit can contain the crushed peony seeds into a cloth bag, slag materials are left in the cloth bag during oil pressing, oil materials flow out of the cloth bag, and the slag materials and the oil materials can be completely separated. According to the peony seed crushing and oil pressing equipment, peony seeds can be crushed before oil pressing, and the oil yield is effectively increased.

The application relates to the technical field of nanomaterials, and discloses monodisperse nanometer carbonate and a preparation method and application thereof. The method for preparing the monodisperse nanometer carbonate comprises the following steps: (1) performing acid-base neutralization reaction on a calcium source and / or a magnesium source and a surfactant in the presence of an organic solvent; wherein the calcium source is an alkaline calcium source, the magnesium source is an alkaline magnesium source, and the surfactant is an organic acid; (2) mixing water with the product obtained through the acid-base neutralization reaction in step (1); (3) performing first carbonization reaction on the mixture obtained through step (2) and a carbon source a; (4) performing second carbonization reaction on the product obtained through the first carbonization reaction and a carbon source b; wherein the carbon source a is different from the carbon source b. The monodisperse nanometer carbonate particles disclosed by the application are small in particle size, 1-5 nm in size, small in particle size, uniform in particle size distribution, monodisperse, and good in dispersity.

This invention relates to the field of polymer materials technology, and discloses a polypropylene foamed bead, a molded polypropylene foamed bead, its preparation method, and its application. The polypropylene foamed beads are obtained by foaming a foaming composition containing polypropylene microparticles; the average particle size of the polypropylene microparticles is ≤1 mm, the aspect ratio of the polypropylene microparticles is ≤1.2, the ash content is ≤400 ppm, and the bulk density is >0.35 g / cm³. 3 The polypropylene foam beads have a particle size of less than 1 mm, a bulk ratio to apparent size ratio of ≤1.6, and a closed-cell rate of ≥99%. This significantly reduces energy consumption during foam bead molding, and the foam bead molded bodies prepared from these beads exhibit superior appearance, mechanical properties, and thermal insulation properties. The shrinkage rate of the polypropylene foam bead molded bodies is less than 1.5%. This is particularly advantageous for preparing thin-walled or complex-shaped EPP molded products.

The invention provides an anti-optical crosstalk structure of a double-layer light guide plate and a preparation method of the anti-optical crosstalk structure. The structure comprises an upper-layer light guide plate and a lower-layer light guide plate which are oppositely arranged in parallel, and an air layer is formed between the two light guide plates; the SiO2 plating layer is arranged on the lower surface of the upper-layer light guide plate and / or the upper surface of the lower-layer light guide plate; the side edge light blocking structure is arranged on the light incident side edge of the upper-layer light guide plate and / or the lower-layer light guide plate. Interface transmission optical crosstalk caused by Fresnel reflection is inhibited through the SiO2 plating layer, small-angle light at the edge of a light source is intercepted through the side light blocking structure, and optical crosstalk is inhibited from two dimensions through the synergistic effect of the SiO2 plating layer and the side light blocking structure; meanwhile, square OCA glue is adopted to be attached to non-display areas on the peripheries of the two layers of light guide plates, transparent supporting microbeads are evenly distributed on the edges of the inner sides of the non-display areas, and it is guaranteed that the thickness of an air layer is even and stable. The vehicle-mounted optical crosstalk preventing device is compact in structure and good in optical crosstalk preventing effect, the lighting optical crosstalk rate of the upper layer can be reduced to 3.2%, the lighting optical crosstalk rate of the lower layer can be reduced to 1.8%, and the use requirement of the vehicle-mounted harsh environment is met.

This invention discloses a continuous crystallization apparatus and preparation method for ultrafine ammonium perchlorate. The apparatus consists of a mixing unit, an ultrasonic enhancement unit, a gas-liquid Taylor flow control unit, and a post-processing unit. The preparation method combines solution reaction crystallization, ultrasonic-enhanced mixing, and gas-liquid Taylor flow microscale control. It utilizes the confined space within the Taylor flow liquid section to control crystal growth, providing a uniform and stable growth environment for crystal growth. This effectively avoids the problem of wide crystal particle size distribution caused by uneven supersaturation and wide residence time distribution in traditional stirred crystallizers. It achieves continuous and controllable crystallization of ultrafine ammonium perchlorate, overcomes the defects of wide particle size distribution in traditional methods, and can prepare ultrafine ammonium perchlorate crystals with narrow particle size distribution and small average particle size. It has the advantages of simple and efficient process and high product quality.

This invention belongs to the field of veterinary drugs and discloses a method for preparing difloxacin suspension injection, comprising the following steps: Step 1: Difloxacin is added to an aqueous solution containing gluconolactone to prepare a difloxacin solution; Step 2: A crystallization inhibitor is added to the difloxacin solution in Step 1; Step 3: The solution is dispensed into glass vials for injection, sealed, and sterilized with high-temperature steam; Step 4: The sterilized injection solution is immediately subjected to cold water immersion or cooled to room temperature in air for leak testing and crystallization, simultaneously obtaining difloxacin injection solution. Based on previous research results, this invention further proposes that, in the further optimization process, gluconolactone is used as a co-solvent for difloxacin, dissolved by heating, dispensed into injection bottles, sterilized at high temperature, and then recrystallized after cooling to obtain a suspension with small crystal particle size. This process is suitable for large-scale production.

This invention relates to a fat mimic based on micro / nano-sized starch, its preparation method, and its application. The preparation method of the fat mimic includes: S1: providing a potato starch solution with a concentration of 15-20%; S2: adding 35-50 u / g of α-amylase (with an enzyme activity of 10000 u / g) based on the mass of potato starch, and enzymatically hydrolyzing at 85-90℃ for 5-15 min to obtain a potato starch enzymatically hydrolyzed fat mimic with a DE value of 2-3; S3: adjusting the potato starch enzymatically hydrolyzed fat mimic to a concentration of 1-5%, and using dynamic ultra-high pressure microfluidic technology at a pressure of 180-200 MPa for 6-12 cycles of micro-nano-sized potato starch fat mimic to obtain a particle size between 500-700 nm. Compared with enzymatically hydrolyzed fat mimics, the micro-nano-scale potato starch fat mimics prepared in this invention have significantly improved oil retention, emulsification, emulsification stability, sedimentation, and apparent viscosity. This is beneficial for increasing their fat substitution rate in food and developing low-fat or fat-free foods with a more delicate texture and better sensory experience and textural expectations for consumers.

The application discloses a plant-based water-based adhesive and a preparation method thereof, and relates to the technical field of water-based adhesives. When the plant-based water-based adhesive is prepared, 2,4-dihydroxybenzophenone and acryloyl chloride are reacted to obtain an acrylate-based benzophenone; the silicon dioxide treated by a silane coupling agent is reacted with the acrylate-based benzophenone to obtain modified silicon dioxide; 4-methylumbelliferone is sequentially reacted with hexamethylene diisocyanate and 2-amino-2-methyl-1,3-propanediol to obtain an umbelliferone diol; castor oil, polybutylene adipate, the umbelliferone diol, dimethylol propionic acid and isophorone diisocyanate are copolymerized, neutralized by triethylamine and emulsified by deionized water to obtain a polyurethane emulsion; and the polyurethane emulsion and the modified silicon dioxide are mixed to obtain the plant-based water-based adhesive. The plant-based water-based adhesive provided by the application has excellent mechanical properties and weather resistance.

This utility model discloses a waste treatment device for isothiazolinone production, relating to the field of isothiazolinone production technology. The waste tank is connected to a first filter, the first filter is connected to a settling tank, the settling tank is connected to a distillation tank, the distillation tank is connected to a degradation tank, the degradation tank is connected to a sedimentation tank, the sedimentation tank is connected to a second filter, the second filter is connected to a nanofiltration membrane device, and the nanofiltration membrane device is connected to a treatment water tank. This device can effectively remove harmful substances from the isothiazolinone production waste, achieving harmless treatment of the waste and also realizing resource recycling to a certain extent, thus possessing good environmental and economic benefits.

The invention relates to the technical field of nano materials, in particular to a preparation method of a Zn-based bimetal MOFs material and application of the Zn-based bimetal MOFs material as a medical drug carrying material. The preparation method comprises the following steps: preparing Zn, Mn and a ligand according to a molar ratio of 1: 1: (72-80), and mainly comprises the steps of preparation of metal salt solutions, coordination polymerization reaction, separation and purification, and drying. The process for preparing the Zn-based bimetallic MOFs material is simple and environmentally friendly, the obtained product has the excellent performance of being small in particle size, regular and stable, and the material loaded with doxorubicin hydrochloride has high loading rate and has potential clinical conversion value.

The utility model discloses a novel swing type planetary ball mill, which relates to the technical field of ball milling equipment and comprises a base, two swing support frames fixed at the top of the base, swing bearing seats fixed at the tops of the swing support frames, a swing frame rotatably connected between the two swing support frames through the swing bearing seats, and a swing arm mechanism arranged on the base. The swing arm mechanism comprises a speed reducer fixed to the base, a motor is installed at the input end of the speed reducer, a rotating wheel is fixed to an output shaft of the speed reducer, a swing arm is fixed to the shaft end of one end of the swing frame, and a connecting rod is rotationally connected between the rotating wheel and the swing frame. Reciprocating swing of the grinding tank can enlarge the coverage range of grinding balls in the tank, the phenomenon that materials on the inner edge or the bottom of the grinding tank are not fully ground in a traditional single rotation mode is reduced, an additional impact direction such as horizontal or vertical vibration can be introduced, energy input in unit time can be improved in combination with original planetary rotation, and the service life of the grinding tank is prolonged. And particularly, the crushing effect on tough materials is better.

The invention discloses a copper-silicon catalyst for plasma treatment as well as a preparation method and application of the copper-silicon catalyst. According to the method, a copper-silicon catalyst precursor prepared by a traditional ammonia distillation method is subjected to dielectric barrier discharge plasma treatment in the atmosphere of H2 / Ar and the like, and traditional high-temperature roasting and reduction processes are replaced. According to the method, efficient reduction and high dispersion of copper can be achieved at the room temperature, the Cu < + > / Cu0 proportion is regulated and controlled, and the strong interaction between metal and a carrier is enhanced. The catalyst is used in a reaction for preparing ethylene glycol through hydrogenation of dimethyl oxalate, the activity, selectivity and stability of the catalyst are higher than those of a traditional heat treatment catalyst, the dimethyl oxalate conversion rate reaches up to 100%, the ethylene glycol selectivity is larger than 97%, and the stability reaches 1000 h or above. The method is simple in process, low in energy consumption and environment-friendly, and has a wide industrial application prospect.

The application belongs to the technical field of sodium-ion battery cathode materials, and discloses a pyrophosphoric acid sodium iron phosphate composite material and a preparation method and application thereof. By regulating the microenvironment of chelation reaction, the chelation state of iron ions is optimized, iron ion precipitation is avoided, and the formation of electrochemically inert impurities is inhibited. Meanwhile, graphene oxide constructs a three-dimensional conductive network to improve the electronic transmission capacity of the material. The pyrophosphoric acid sodium iron phosphate composite material prepared by the application has small particle size, uniform dispersion, no inert impurities and is tightly coated by the conductive network. The material has a discharge specific capacity of 120.9 mAh·g ‑1 at 0.5 C, still maintains a reversible capacity of 78.1 mAh·g ‑1 at 20 C high rate, and has a capacity retention rate of 84.9% after 1000 cycles, and the full battery assembled with the hard carbon negative electrode also exhibits excellent rate and cycle performance.

This invention discloses a method for preparing in-situ grafted and dispersed nano-silica, relating to the field of nanomaterial preparation technology, comprising the following steps: Step ①, mixing sodium-free silica sol solution, water, and polyol in a high-pressure reactor; Step ②, gradually raising the reactor temperature from room temperature to 150-180℃, initially introducing acid anhydride gas or liquid at a certain flow rate, and maintaining temperature, constant pressure, and rotation speed until the pH value reaches 4.0-5.0±0.5, obtaining a primary mixture of hydrated nano-silica; Step ③, pumping an organosilicon coupling agent into the high-pressure reactor using a high-pressure metering pump, maintaining temperature and pressure, stirring the reaction for 30-90 minutes, then cooling, depressurizing, purging with nitrogen, and separating the reaction liquid to obtain grafted and dispersed nano-silica. This application aims to achieve readily available and inexpensive raw materials, reduce the difficulty of preparing nano-silica; solve the problems of dispersibility and compatibility with organic matter in nano-silica; simplify the procedure and improve preparation efficiency.

The invention provides a stirring structure and a fluidized stabilized soil pulping station. The stirring structure comprises a stirring frame, a stirring cavity fixedly arranged on the stirring frame, a stirring assembly rotationally arranged in the stirring cavity, a first driving mechanism for driving the stirring assembly to rotate, and a second driving mechanism for driving the stirring assembly to be separated from the stirring cavity; the stirring assembly comprises a stirring cavity and a stirring assembly, the stirring cavity is provided with a hemispherical bottom surface, the stirring assembly comprises a stirring shaft and a hollow hemispherical stirring part which is concentrically and fixedly connected with the stirring shaft and matched with the hemispherical bottom surface, and a plurality of filtering holes are formed in the stirring part. And the grinding action is realized in the pulping process by matching the spherical surface, so that the particle size is smaller, and mud and water are more uniformly mixed.