741 results about "Vacuum drying" patented technology

The invention relates to a method for preparing a lithium iron phosphate / carbon composite material of a lithium ion battery, which belongs to the technical field of lithium ion batteries. The method for preparing the lithium iron phosphate / carbon composite material of the lithium ion battery comprises the following steps of: 1) preparing a suspending graphene-dispersed aqueous solution system, namely, crushing graphite to 1 to 5 microns, adding the crushed graphite into distilled water or purified water, adding 0.1 to 5 percent of surfactant, heating with stirring the mixed solution to 180 to 250 DEG C in a sealing way, performing stirring for 2 to 6 hours and reducing the temperature; 2) crushing lithium iron phosphate to the particle size of 1 to 5 microns, adding the crushed lithium iron phosphate into the distilled water or the purified water, adding with stirring 0.01 to 1 percent of coupling agent, performing uniform stirring, adding the graphene-dispersed aqueous solution, and performing stirring and filtration; and 3) vacuum-drying solid powder obtained by the filtration, and calcinating the dried solid powder for 2 to 12 hours to obtain the graphene-coated lithium iron phosphate cathode material. The method has the advantages of simple process, high material performance, high conductivity, high bulk density, high compacted density and the like.

The invention discloses a preparation method of an In2O3-Cu-Cu2O ternary heterojunction catalyst and a preparation method of the In2O3-Cu-Cu2O ternary heterojunction catalyst. The method comprises the following steps: at room temperature and normal pressure, firstly, dissolving indium chloride tetrahydrate in a mixed solvent of ethylenediamine-ethylene glycol (the volume ratio is 1: 20-1: 30) and dihydric alcohol amine to obtain a homogeneous solution; then transferring the solution to a hydrothermal kettle, adding deionized water and Cu2O powder with different volumes, and carrying out hydrothermal crystallization at 160-200 DEG C for 10-14 hours; and centrifuging the obtained precipitate, alternately washing with water and alcohol for 2-3 times, carrying out vacuum drying at 60 DEG C for 5-7 hours, heating to 600 + / -10 DEG C at a speed of 3-5 DEG C / min in an N2 atmosphere, calcining for 3 hours, and cooling along with a furnace to obtain a target product. By adjusting the adding amount of the deionized water, the mass proportion of the three phases of In2O3, Cu and Cu2O can be continuously adjusted and controlled, and controllable preparation from'rich copper 'to'rich cuprous oxide' and'stable ternary 'is achieved.

The invention discloses a wafer bonding method, which comprises the following steps of: 1, providing a first wafer and a second wafer, the surface of the first wafer being provided with a microstructure with a high aspect ratio; step 2, cleaning the first wafer and the second wafer; step 3, performing vacuum drying treatment on the first wafer and the second wafer, wherein the vacuum pressure is controlled to be 0.1-10 Torr in the vacuum drying treatment process; step 4, carrying out pre-bonding on the first wafer and the second wafer to form a bonding body; and step 5, carrying out annealing treatment on the bonding body. Aiming at the problem of residual water in the pre-cleaning process in the bonding process of the micro-structure wafer with a high aspect ratio, the wafer is placed in a controllable vacuum environment, phase change boiling of liquid water under the condition of no heat input is realized, and the problem of high-temperature heat damage caused by an existing heating and baking method is effectively avoided.

The application discloses a porous aluminum-based carrier and a preparation method thereof, a CO2 adsorbent and application thereof. The preparation of the porous aluminum-based carrier comprises the following steps: segmental aging: a solution containing pseudo-boehmite is subjected to two-stage aging, the first stage is stirring aging, and the second stage is standing aging, the two kinds of aging modes are combined to improve the crystallinity of the pseudo-boehmite; organic solvent washing and pore expansion: the pseudo-boehmite is filtered out, and is subjected to water washing first and then organic solvent washing; segmental drying: low-temperature air blowing drying and vacuum drying are combined, the drying mode, the drying temperature and the solvent evaporation rate during drying are adjusted to avoid pore shrinkage or collapse caused by excessively high drying temperature and excessively fast solvent evaporation speed. The preparation of the porous aluminum-based carrier is simple in operation and low in energy consumption, and the CO2 adsorbent prepared from the porous aluminum-based carrier and an organic amine has excellent adsorption performance such as high adsorption capacity, fast adsorption rate and high stability.

The application belongs to the technical field of drying equipment, and particularly relates to a double-cone vacuum drying machine and a silver nitrate drying method. The double-cone vacuum drying machine comprises a stock bin, a gas path mechanism, a heat source mechanism, a first power mechanism, a blowing adjustment mechanism and a second power mechanism. The second power mechanism drives the arc-shaped plate in the blowing adjustment mechanism to reciprocatingly rotate relative to the transfer bin, so as to adjust the direction and flow rate of the hot nitrogen gas blown out of the upper opening of the transfer bin. When the arc-shaped plate rotates clockwise, the wet silver nitrate material that is flipped upward under the action of centrifugal force is blown away. The second power mechanism cooperates with the blowing adjustment mechanism to reciprocatingly adjust the blowing direction and blowing flow rate of the hot nitrogen gas, which can not only ensure that the dry layer on the surface of the wet silver nitrate material is broken, but also avoid the problem that the wet silver nitrate material splashes after the dry layer on the surface of the wet silver nitrate material is broken. That is, the problem that the heat and mass transfer path inside the wet silver nitrate material is lengthened after the dry layer is formed on the surface of the wet silver nitrate material, which affects the drying efficiency and drying time, is overcome.

The invention relates to the technical field of foaming, and discloses a multi-layer co-extrusion foaming buffer cotton continuous production forming process which comprises the following steps: pretreating raw materials, respectively placing polyolefin resin, biodegradable polyester and foaming agent master batch in a vacuum drying oven, drying at 60 + / -5 DEG C for 2-4 hours, controlling the water content to be less than 0.1 wt%, melting and co-extruding to obtain the multi-layer co-extrusion foaming buffer cotton. When multi-layer co-extrusion synchronous foaming is carried out, by establishing a melt pressure dynamic threshold standard and setting differential pressure control parameters for different functional layers, the stability of interface bonding of all co-extrusion layers is guaranteed, and meanwhile, melt pressure fluctuation in the supercritical fluid injection process is subjected to feedback analysis in real time; according to the method, whether the problem of abnormal fluctuation of melt pressure occurs on a co-extrusion layer interface or not can be detected in real time, the structural integrity of interlayer bonding is guaranteed, the risk of cell collapse is further reduced, and when foaming ratio mismatch is detected, temperature field distribution can be adjusted in real time according to preset gradient foaming parameters.

The preparation method of the Ni-Mn bimetallic oxide modified magnesium-based hydrogen storage composite material comprises the steps that 1, under the protection of an argon atmosphere, pure magnesium powder is placed in a reaction kettle, and a product MgH2 is obtained; step 2, dissolving nickel nitrate hydrate and manganous nitrate hydrate in absolute ethyl alcohol, adding urea into the mixed solution, continuously stirring at room temperature, and then carrying out constant-temperature reaction in a tetrafluoropolyvinyl chloride high-pressure reaction kettle in a drying oven; after the reaction is finished, cooling to room temperature, and carrying out centrifugal washing; supernate obtained after centrifugal washing is poured out, precipitates are reserved and transferred into a vacuum drying box, and vacuum drying is conducted; grinding a block obtained after drying, and transferring the block into a tubular furnace for heat treatment to obtain a bimetallic oxide NiMn2O4; 3, MgH2, NiMn2O4 and stainless steel ball milling beads are weighed and put into a mechanochemical reaction ball milling kettle, intermittent ball milling is conducted for a certain time under the protection of a specific atmosphere, and then a composite sample MgH2-NiMn2O4 is collected. The practical application benefit of the magnesium-based hydrogen storage technology can be greatly improved.

The invention relates to a counter-ion adsorption high-voltage electrostatic spraying device and application thereof to preparation of a food sugar coating, and belongs to the technical field of equipment machinery and food processing. The device comprises a material conveying system, a high-voltage electrostatic spraying system, a sugar liquid supply system, a gas supply system, a sugar liquid recovery system, a microwave vacuum drying system and a control cabinet, the sugar liquid supply system and the gas supply system are both connected with the high-voltage electrostatic spraying system, the material conveying system is arranged below the high-voltage electrostatic spraying system, the material conveying system is connected with the microwave vacuum drying system, and the sugar liquid recovery system is further arranged below the material conveying system; the above systems are all controlled by a control cabinet. Through pulse switching of a high-voltage electrostatic field and a sugar liquid material, counter-ion charge accumulation of sprayed sugar liquid is realized, namely, positive charge sugar liquid (chitosan and the like) and negative charge sugar liquid (Arabic gum, carrageenan and the like) are alternately sprayed under the high-voltage electrostatic field, so that electrostatic adsorption and directional deposition of the sugar liquid on the surface of food are realized.

A preparation method of a high-activity nitrogen-doped carbon-loaded CoRu nano-alloy is used for enhancing pH universal hydrogen evolution, and is characterized by comprising the following steps: dissolving dopamine hydrochloride in an aqueous solution containing H2O2 and CuSO4. 5H2O, and magnetically stirring to form a uniform mixture; and pre-wetting carbon cloth with ethanol, immersing the pre-wetted carbon cloth in the dopamine solution for 10 minutes, taking out the pre-wetted carbon cloth, washing the pre-wetted carbon cloth with deionized water for three times, and carrying out vacuum drying to obtain the polydopamine modified carbon cloth marked as PDA / CC. And immersing the obtained PDA / CC into 20 mL of aqueous solution containing Co (NO3) 2.6 H2O and RuCl3 for 6 hours to realize metal ion adsorption. And washing and drying a sample, and calcining the sample in a tubular furnace at 700 DEG C in an N atmosphere for 2 hours to obtain the self-supporting nitrogen-doped porous carbon-loaded CoRu alloy material which is recorded as CoxRu (at) CN / CC. Through a synthesis strategy based on active ion capture and in-situ carbon thermal reduction, and through construction of a nitrogen-doped carbon cobalt ruthenium alloy nanostructure and a strong metal-carrier synergistic effect, efficient hydrogen overflow and establishment of stable active sites are realized; therefore, the performance bottleneck that high activity and high stability of a traditional electrocatalyst in a wide pH range are difficult to cooperate is broken through.

The invention provides an efficient surface treatment method for plastic gaskets, which comprises the following steps: S1, pretreatment: putting a plurality of groups of plastic gaskets into a tool basket, and sequentially carrying out ultrasonic degreasing by an ultrasonic cleaning machine, deionized water spraying washing by a spraying cleaning machine and vacuum drying by a vacuum drying oven; s2, plasma activation is conducted, specifically, the gasket is placed on a rotary carrying table of rotary plasma treatment equipment along with the tool basket, a plasma treatment cavity is vacuumized to 5-15 Pa, then treatment gas is introduced, a plasma generator is started, and the rotary carrying table drives the gasket to rotate at a constant speed during treatment; s3, functional coating coating is conducted, specifically, the activated gaskets are taken out and arranged to an ultrasonic atomization and electrostatic spraying all-in-one machine, and modified coating is coated; and S4, composite curing: pre-curing the coated gasket through an infrared pre-curing oven, and then transferring the gasket into an ultraviolet pre-curing oven for ultraviolet curing to obtain a finished product. According to the method, the treatment efficiency and uniformity are improved, and the coating adhesive force and the gasket performance are enhanced.

The invention relates to the technical field of shale exploitation, and discloses a shale reservoir wettability dynamic determination method, which comprises: S1, selecting a shale plunger core, carrying out supercritical CO2 cleaning and vacuum drying, and carrying out high pressure saturation by using simulated crude oil to obtain an initial oil saturation; and S2, the saturated rock core is loaded into a high-temperature and high-pressure rock core holder, and under the simulated formation temperature and pressure condition, simulated formation water containing the paramagnetic contrast agent is injected at the constant flow speed for displacement till the water content of the outlet end reaches 98%. According to the invention, dynamic and three-dimensional space representation of wettability is realized: three modal data of nuclear magnetic resonance, resistivity and sound wave are synchronously acquired in the displacement process, so that the limitation of a traditional static method is overcome, and the dynamic process of the wettability changing along with the fluid saturation state can be captured in real time; and finally, a high-resolution three-dimensional wettability distribution map is generated, and non-uniform distribution of wettability in the core is visually revealed.

The invention relates to the technical field of photovoltaic material production, in particular to zirconium phosphate nano quantum dot light conversion material preparation equipment and a preparation method thereof. The zirconium phosphate nano quantum dot light conversion material preparation equipment comprises a protective shell, a first electrode, a second electrode, a third electrode, a fourth electrode, a fifth electrode, a sixth electrode, a fifth electrode and a sixth electrode, the protective shell is internally provided with a working cavity, and the working cavity is sequentially divided into a drying cavity, a standing cavity and a reaction cavity from top to bottom; the vacuum drying module is arranged in the drying cavity and is used for carrying out vacuum drying on reactants; the standing cooling module is arranged in the standing cavity; the reaction module is arranged in the reaction cavity and comprises a reaction main body, a planetary stirring mechanism and a rotary heat exchange mechanism; the stirring assembly is in driving connection with a sun gear of the planetary stirring mechanism, and the rotary heat exchange mechanism is in driving connection with a planetary gear to guide and heat reaction liquid in the reaction main body. By eliminating the influence of water in the reaction process, the zirconium phosphate nano quantum dot light conversion material can be simply and conveniently obtained, and the method has good application value.

The invention relates to the technical field of gas adsorption materials, in particular to a plasma modified UiO-66-NH2 / activated carbon composite filter material as well as a preparation method and application thereof. The preparation method comprises the following steps: adding activated carbon into a UiO-66-NH2 precursor solution, vacuumizing in a vacuum drying oven for 1-3 hours, then transferring into a reaction kettle, heating to 80-120 DEG C, reacting for 20-25 hours, cooling to room temperature, washing and drying to obtain a UiO-66-NH2 / activated carbon composite material; and placing the UiO-66-NH2 / activated carbon composite material in a plasma reactor, and carrying out plasma treatment by taking H2 / Ar as a working gas to obtain the plasma-modified UiO-66-NH2 / activated carbon composite material. According to the invention, UiO-66-NH2 is loaded in the activated carbon, so that the effects of increasing the specific surface area of the activated carbon and developing a microporous structure are achieved, the adsorption capacity of low-concentration trichloro ethylene reaches 281 mg / g, and the UiO-66-NH2 loaded activated carbon is a filter material for effectively adsorbing trichloro ethylene (TCE).

The invention discloses a combined drying method for maintaining color and nutrition of mango freeze-dried products, and belongs to the technical field of food processing. The preparation method comprises the following steps: cutting mangoes, performing vacuum impregnation in a composite protection solution containing maltodextrin, trehalose, L-ascorbic acid and citric acid, then performing quick-freezing treatment, and finally adopting a combined drying process combining microwave vacuum drying and vacuum freeze drying to reduce the water content of the materials to the final requirement in two stages. The method is mainly used for efficiently producing a high-quality mango freeze-dried product which can perfectly maintain the natural color, shape and nutritional ingredients of mangoes; the technical problems that the drying period is too long, the energy consumption is high, and color browning and heat-sensitive nutritional ingredient degradation are prone to occurring in the long drying process when mangoes are treated through a traditional freeze-drying technology are effectively solved.

A preparation method of the efficient solar evaporator comprises the steps that (NH4) Mo7O24. 4H2O and CH4N2S are weighed and dissolved in water, chitosan biochar is added, stirring reaction is conducted, washing and drying are conducted after cooling, and MoS2-chitosan biochar is prepared; and weighing sodium alginate, dissolving the sodium alginate in water, adding the prepared MoS2-chitosan biochar, carrying out ultrasonic stirring, loading on purified melamine sponge, freezing, carrying out vacuum drying, soaking in a CaCl2 solution, washing, freezing, and carrying out vacuum drying to obtain the evaporator. By developing a novel evaporation material, the limitation of a traditional single-interface structure on the evaporation rate is broken through, the evaporation efficiency and the evaporation rate are effectively improved, and the photothermal conversion efficiency and the water production capacity are remarkably improved; and the salt resistance and the pollution resistance of the evaporator are solved, the problem of long-term operation stability is solved, and the method has very high practicability and wide applicability.

The invention relates to the related technical field of vacuum drying, in particular to a vacuum drying device for plastic particle production, which comprises a base, a support frame is fixedly mounted on the upper side surface of the base, and an outer box body is clamped on the inner ring surface of the support frame. According to the vacuum drying device for plastic particle production, through arrangement of a water pump, a spiral pipe and a central pipe, in the using process, the water pump pumps hot water from a water tank through a water suction pipe, the hot water flows into a second connecting pipe through a water inlet pipe and then is shunted through the second connecting pipe, the hot water flows into the central pipe and the spiral pipe, and finally hot water backflow is achieved through a water collecting pipe; according to the whole structure, cyclic utilization of hot water is achieved, cost is saved, meanwhile, the spiral pipe and the central pipe can provide uniform internal and external synchronous heating for materials, and drying efficiency and quality are improved.

The utility model discloses a vacuum efficient drying tank which comprises a tank body, a tank cover, a heater, a first lifting driving mechanism and first idler wheels, the tank cover is arranged on the tank body in a sliding mode, an air exhaust pipe connector is arranged at the bottom or one side of the tank body, a support is arranged at the bottom of the tank body, and a hanging basket is placed on the support. Limiting blocks located on the periphery of the hanging basket are arranged on the support, the heaters are arranged in the groove body and located on the two sides of the hanging basket, the first lifting driving mechanisms are symmetrically arranged at the bottom of the groove body, and the first rolling wheels are arranged on the tops of the first lifting driving mechanisms and located below the hanging basket. The height of the first rolling wheels can be changed through one-by-one stretching and retracting of the first lifting driving mechanism, the two ends of the hanging basket are driven by the first rolling wheels to turn up and down, the dip angle of the hanging basket is changed, infrared radiation of the heater can cover more surfaces of a workpiece, evaporation of water is accelerated, and the heating efficiency and the drying effect are improved.

This invention discloses manganese ion-substituted MgCoNiCuZn high-entropy oxides, their preparation methods, and applications, belonging to the field of metallic materials technology. It is a Mg... （1‑x） / 4 Co （1‑x） / 4 Ni x Cu （1‑x） / 4Zn （1‑x） / 4‑z Mn z O high-entropy oxides or Mg （1‑y） / 4 Co （1‑y） / 4Ni y Cu （1‑y） / 4 Zn （1‑y） / 4‑z Mn z The high-entropy oxides, with x and y values ​​of 0.15–0.35 and z values ​​of 0.02–0.08, are prepared by ball milling MgO, CoO, NiO, CuO, ZnO, and MnO powders in stoichiometric ratio, vacuum drying, thorough grinding, and then spreading the mixture evenly. The mixture is then placed in batches in a high-temperature tube furnace, slowly heated in an air atmosphere, held at that temperature, and then slowly cooled with the furnace. By gradually replacing Zn with Mn, the resulting high-entropy oxides exhibit excellent electrochemical performance.

The utility model relates to the technical field of pharmacy, and discloses a pulsating vacuum drying machine for pharmacy, which comprises a machine body, a plurality of door bodies are rotatably connected to the front wall surface of the machine body, the door bodies are uniformly arranged on the front wall surface of the machine body, the front wall surface of each door body is provided with a window and a drying structure, and the drying structure is arranged in a cavity of the machine body and used for drying medicinal materials. Each drying structure comprises a heat outlet pipe, a placement plate and a clamping bottom, the heat outlet pipes are fixedly connected to the tops of the partition plates, the placement plates are clamped to the tops of the heat outlet pipes, the clamping bottoms are fixedly connected to the bottoms of the placement plates, the clamping bottoms can be clamped to the heat outlet pipes, and medicinal materials can be placed on the tops of the placement plates; the medicinal materials can be located in the center of each cavity, and due to the arrangement of the leakage holes, the medicinal materials located on the lower portion can bear the same heat.

The invention relates to the technical field of vacuum reduced-pressure drying, and provides a reduced-pressure vacuum drying oven which comprises a drying oven body and a rotating door rotationally installed on the inner wall of the drying oven body. The vacuum valve knob is rotationally mounted on the surface of the drying box body; and the vacuum pump is arranged on the inner wall of the drying box body and used for extracting internal air, and an exhaust valve is arranged on the surface of the drying box body. According to the decompression vacuum drying box provided by the invention, medicines can be more uniformly exposed under the heating action of the heating plate in the drying process through rotation of the drying frame, so that more uniform drying is realized, the medicines are prevented from being located at fixed positions for a long time in the drying process, and the problem that in the prior art, in the drying process, the drying efficiency is high is solved. The temperatures at different heights are different, and the drying effect of each layer is possibly different when the layers are located at the same position for a long time, so that the overall drying effect is influenced.

This application relates to the field of food processing technology, and in particular to a processing method and system for daylily snack food. The method includes raw material grading, graded blanching and color protection, gradient dehydration, moisture balancing, directional shaping, vacuum impregnation and seasoning, and low-temperature vacuum drying steps, along with corresponding automated equipment. By dynamically matching process parameters with raw material quality characteristic vectors, combined with feedback control of moisture migration rate during dehydration, the method effectively maintains stable texture and color. Directional shaping imparts a standardized geometric shape to the product, improving its adaptability for packaging and transportation. Vacuum impregnation and low-temperature final drying ensure uniform flavor and safe water activity. This application effectively solves problems such as deterioration of texture, nutritional fluctuations, monotonous form, and unstable quality in traditional daylily processing.

The present application relates to the technical field of biological medicine, and particularly relates to a method for extracting and determining selenoprotein from selenium-rich lycoperdon pygmaeum mycelium, wherein the lycoperdon pygmaeum mycelium fermented by a 20L biological culture tank is dried in a vacuum drying box, ground into standard powder through a 100-mesh sieve, 0.5g of the standard powder is weighed, a 0.05mol / L NaOH solution is added, ultrasonic-assisted extraction is performed, then centrifugation is performed at a speed of 3000r / min for 15min, the supernatant is adjusted to an isoelectric point, centrifugation is performed again to obtain a protein precipitate, and finally the protein precipitate is dried in a freeze dryer to obtain a protein sample. The present application is dedicated to using the selenium-rich lycoperdon pygmaeum mycelium as raw material, adopting ultrasonic extraction, optimally optimizing the extraction process of selenoprotein, quantitatively analyzing the selenium content in the protein, detecting the change of the type and quantity of amino acids before and after selenium enrichment through a thin layer chromatography test, and understanding the influence of selenium on the amino acids in the lycoperdon pygmaeum mycelium.

The utility model discloses a kind of vacuum drying machines for manufacturing cable material, it is related to cable material processing technical field.The utility model includes heat preservation shell, the heat preservation shell bottom is fixedly connected with three support legs, the heat preservation shell bottom inboard is fixedly connected with drying cylinder, the drying cylinder top is fixedly connected with feed pipe, further include: recovery part, the recovery part is installed in heat preservation shell interior, the recovery part is used to surround water vapor in drying cylinder outside.The utility model is through setting recovery part, specifically because the setting of check valve, water vapor only enters pipe two, the heat in water vapor will be transferred to cable material by check valve and drying cylinder, water vapor first from pipe two top flows to bottom, then from check pipe bottom flows to top, reenter pipe two, when water vapor is cooled, open water outlet valve, cooling water flows out, the heat in water vapor is reused, effectively avoid the situation of heat waste occurs.

The invention discloses a method for preparing high-quality euphausia superba powder by using euphausia superba shelling byproducts, which comprises the following steps: shelling euphausia superba cooked at low temperature, taking the euphausia superba shell byproducts, performing low-temperature vacuum drying until the moisture is below 15%, and crushing and sieving the obtained euphausia superba crisp substances to obtain the high-quality euphausia superba powder. According to the method disclosed by the invention, the euphausia superba unshelling byproducts are turned into wealth from waste, the high-quality euphausia superba meal which is superior to the traditional whole euphausia superba meal in key indexes is successfully prepared through precise process control, and a stable and excellent special raw material basis is provided for the high-end euphausia superba oil industry. According to experimental screening, the krill meal with the high astaxanthin content is obtained at the cooking temperature of 70 DEG C, the cooking time of 25 min and the vacuum drying temperature of 60 DEG C, the astaxanthin content reaches up to 4670.82 mu g / g oil and is far higher than that of krill meal prepared in the prior art, and breakthrough progress is achieved.

The invention relates to a preparation method of a cement additive, which comprises the following steps: S1, selecting a mineral supplement, ultrafine powder, an anti-cracking agent, a reinforcing agent, a stabilizer and a moisture regulator according to a set proportion; uniformly mixing the mineral supplement, the superfine powder, the anti-cracking agent and the reinforcing agent; adding a stabilizer and a moisture regulator, and uniformly mixing; excessive moisture is removed in a vacuum drying mode; and carrying out particle size analysis on the treated cement additive. By optimizing the proportion of the mineral supplement, the superfine powder, the anti-cracking agent, the reinforcing agent, the stabilizer and the moisture regulator, the strength, the crack resistance, the impermeability and the fluidity of cement are improved, the compactness and the strength of the cement are improved by the nano-scale silicon dioxide and the calcium carbonate, the crack resistance and the toughness are improved by the anti-cracking agent and the reinforcing agent, the fluidity is improved by the stabilizer, and the strength of the cement is improved by the superfine powder. And the quality and uniformity of the cement additive are optimized by adopting vacuum drying and particle size analysis, so that the construction quality is improved, and the service life is prolonged.

The utility model discloses belt type vacuum drying equipment for drying phosphorus flame retardants, which belongs to the technical field of drying equipment and comprises a mounting table, a belt conveyor is mounted at the top end of the mounting table in a penetrating manner, an auxiliary plate is fixedly connected to the top end of the mounting table, and an open type collecting box is fixedly connected to the top end of the mounting table. A wedge-shaped plate is fixedly connected to the inner bottom wall of the collecting box, a mounting roller is fixedly connected to the inner side of the collecting box through two rotating shafts, a stepping motor for providing power for the rotating shafts is mounted on the periphery of the collecting box, a cleaning brush adheres to the periphery of the mounting roller, and the fixed end of a linear motor is mounted on the side face of the mounting table; the driving end of the linear motor is fixedly connected with a mounting plate, the side face of the mounting plate is rotationally connected with a driving shaft, and one end of the driving shaft is fixedly connected with an open type linkage hopper. According to the belt type vacuum drying equipment for drying the phosphorus flame retardant, the belt conveyor can be automatically cleaned, so that the cleaning operation of the device is more time-saving and labor-saving.

The invention discloses a preparation method of high-purity Nb2O5, belongs to the field of preparation of Nb2O5, and solves the problem of low purity of Nb2O5 prepared by the existing method. The preparation method comprises the steps that a metal niobium ingot with the purity larger than or equal to 99.999% is adopted, and vacuum drying is conducted after surface peeling, dilute nitric acid ultrasonic cleaning and high-purity water flushing are conducted; the pretreated niobium ingot is subjected to a hydrogenation reaction in a pure hydrogen atmosphere, niobium hydride is generated and then crushed, and niobium hydride powder is obtained; carrying out dehydrogenation treatment on the niobium hydride powder under a high vacuum condition; dissolving the metal niobium powder with electronic-grade hydrofluoric acid, and filtering to obtain fluorine niobic acid filtrate; performing multi-stage counter-current extraction and reverse extraction on the fluobiobic acid filtrate by adopting an extracting agent to obtain fluobiobic acid reverse extraction liquid; introducing high-purity ammonia gas into the fluobiobic acid strip liquor, and precipitating to generate niobium hydroxide; ageing, filtering and washing with high-purity water for multiple times to obtain a niobium hydroxide filter cake; and calcining the niobium hydroxide filter cake in a high-purity oxygen atmosphere in stages to obtain niobium pentoxide. The niobium pentoxide prepared by the method disclosed by the invention is high in purity.

The vacuum dryer air extractor capable of being quickly disassembled and assembled and provided with the sealing cover comprises a drying tank and an air extraction assembly, an air extraction straight pipe is installed on the drying tank, the air extraction assembly is arranged in the drying tank and connected with the air extraction straight pipe, and the air extraction assembly comprises a pipe bending mechanism and an air extraction mechanism. The pipe bending mechanism comprises a bent pipe, a protective cover, a connecting mechanism and a bent pipe fixing mechanism, the bent pipe is fixed in the drying tank through the bent pipe fixing mechanism, and the protective cover and the connecting mechanism are connected to the two ends of the bent pipe respectively. The related structure of the air exhaust cap is optimized, and when the air exhaust cap is blocked, the air exhaust cap can be replaced without waiting for full cooling of the vacuum dryer or in the vacuum dryer, so that the air exhaust cap is replaced more conveniently and quickly, the replacement time is shortened from the source, the production efficiency of the vacuum dryer is improved, the enterprise capacity is increased, and the energy consumption is reduced; meanwhile, the sealing reliability can be greatly improved, the materials are prevented from being polluted, and the production quality of the materials is guaranteed.

The application provides a preparation method of piezoelectric nanofiber aerogel, comprising the following steps: S1, zinc oxide is added into hexafluoroisopropanol, polyhydroxybutyrate is added after ultrasonic dispersion, and magnetic stirring is conducted to obtain a PHB@ZnO solution; S2, the PHB@ZnO solution is prepared into a nanofiber membrane through electrospinning, the nanofiber membrane is placed into a vacuum drying box for vacuum drying to obtain a PHB@ZnO nanofiber membrane; S3, the PHB@ZnO nanofiber membrane is added into deionized water, and a short PHB@ZnO nanofiber dispersion liquid is obtained after homogenization; S4, chitosan powder is added into deionized water, glacial acetic acid is added after stirring, and chitosan solution is obtained after continuous stirring; S5, the short PHB@ZnO nanofiber dispersion liquid, the chitosan solution and glutaraldehyde are uniformly mixed to obtain a mixture, the mixture is poured into a mold, the mold is placed into a freeze dryer for freeze drying to obtain piezoelectric nanofiber aerogel. The piezoelectric nanofiber aerogel prepared by the piezoelectric nanofiber aerogel has a porous structure and good piezoelectric performance, and can accelerate bone defect repair.

The invention provides a detection method for improving detection of terpene substances in yeast for making hard liquor, and relates to the field of flavor analysis of fermented food. The method comprises the following steps: 1) performing crushing pretreatment on a target yeast block to obtain yeast powder; 2) taking absolute ethyl alcohol as a solvent, performing water bath rotary evaporation on the yeast powder at 40-60 DEG C, filtering after rotary evaporation, retaining solid-phase yeast powder, and performing vacuum drying to obtain a dried yeast powder sample; (3) collecting a gas-phase sample with stable components volatilized from the yeast powder sample under the conditions of water bath heating and nitrogen purging; (4) pre-concentrating the gas-phase sample by adopting a multi-stage cold trap principle, wherein the enrichment multiple of the gas-phase sample is not less than 1000 in the pre-concentration; 5) collecting the pre-concentrated gas phase sample, inputting the pre-concentrated gas phase sample into a gas chromatograph-mass spectrometer for gas chromatography-mass spectrometry, and determining the terpene substances in the yeast for making hard liquor through standard gas matching. Compared with the prior art, the method has the advantages that 12 terpene substances can be simply and efficiently detected at a time, and the detection rate of the terpene substances is remarkably increased.