705 results about "Supercritical fluid" patented technology

The invention discloses a method and a device for modifying and recycling waste plastics. The method comprises the following steps: carrying out multi-band electromagnetic resonance sorting on plastic fragments, distinguishing plastic types through an intelligent recognition algorithm, and synchronously adopting high-frequency eddy current sorting to remove metal impurities, so as to obtain classified plastic fragments; then supercritical fluid treatment is conducted, impurities are removed through a pressure oscillation system, obtained purified plastic fragments, a chain extender and nanofiller are jointly fed into solid-state shearing equipment, a molecular chain repairing reaction is triggered through a temperature control system, then the purified plastic fragments are injected into an intelligent forming system, and technological parameters are dynamically adjusted based on real-time monitoring data; forming a microstructure self-repairing replica through gradient cooling to obtain a regenerated plastic product, and embedding a traceable chip into the regenerated plastic product; impurity separation efficiency is improved through electromagnetic-vortex synergistic separation, microporous pollutants are deeply removed through supercritical fluid treatment, aged molecular chains are effectively repaired through a solid-state shearing chain extension technology, the microstructure of a product is optimized, and the strength and quality of the regenerated plastic product are improved.

The invention provides a 3D printing foaming part and a preparation method and application thereof, and belongs to the technical field of 3D printing. According to the method for 3D printing of the foaming part, polyamide powder serves as a raw material, the 3D printed part is prepared, then the 3D printed part is subjected to supercritical fluid kettle pressure foaming, and the 3D printed foaming part is obtained. By controlling the melting point and the average particle size of the polyamide powder, the printing temperature and the solubility of supercritical fluid in the 3D printing foaming part, the 3D printing foaming part with high rebound resilience, bending resistance and hydrolysis resistance is obtained, and the 3D printing foaming part has wide application prospects in the field of foaming shoe materials.

The invention discloses a biological environment-friendly clothing material with a self-cleaning function and a preparation method of the biological environment-friendly clothing material. According to the invention, the environmental friendliness is obviously improved, and natural components which can be completely biodegraded are adopted and can be quickly decomposed in the natural environment, so that the micro-plastic pollution is reduced; the self-cleaning function is enhanced, and through the synergistic effect of the bionic hydrophobic surface and photocatalytic decomposition, automatic falling and decomposition of stains are achieved; the durability is enhanced, a dynamic self-repairing network can automatically repair daily wear, the service life is prolonged, and the bio-based raw materials are natural, skin-friendly and excellent in air permeability. The supercritical fluid processing and microwave shaping technology replaces a high-energy-consumption process; emission of toxic substances is eliminated, and organic solvents and fluorine-containing compounds are forbidden in the whole process; raw material loss is reduced, and the using amount of functional materials is reduced through an accurate structure regulation and control technology; the maintenance cost is simplified, and the washing frequency and the use of chemical cleaning agents are reduced due to the self-cleaning characteristic; waste is compressed, and resource utilization of by-products is achieved through a closed-loop production system.

The invention discloses TPU particle foaming equipment and a foaming method. The foaming method comprises the following steps: mixing TPU particles with a nucleating agent, and feeding the mixture into a double-screw extruder to form a preformed body containing a microporous blank body; the preformed body is guided into a multi-zone gradient foaming device, supercritical fluid injection, dynamic pressure field regulation and control and quenching shaping treatment are conducted in sequence, and a foaming body with a directional foam hole structure is formed; then, placing in multi-axial stretching equipment, synchronously applying axial stretching and radial expansion, acquiring thermodynamic parameters and cell form data in real time, and optimizing foaming pressure field parameters and quenching triggering opportunity through a digital twinborn model; and performing plasma activation treatment on the surface of the shaped body, and coating a functional coating to complete the preparation of the functional foaming product. Through the synergistic effect of gradient foaming and a dynamic pressure field, the cell diameter uniformity and rebound rate are improved, multi-axial stretching shaping is combined with digital twinning optimization, cell length-diameter ratio control and density deviation reduction are achieved, and the peel strength of a product is improved through surface functionalization treatment.

The invention relates to a method and a system for measuring fragrance components of essence, and relates to the technical field of essence quality identification, and the method comprises the following steps: S1, constructing a liquid chromatography-gas chromatography-supercritical fluid chromatography multi-dimensional combined analysis system, the system comprises a liquid chromatography system, a gas chromatography system and a supercritical fluid chromatography system which are connected in sequence, and S2, carrying out separation detection on essence samples from different sources or formulas by using the liquid chromatography-gas chromatography-supercritical fluid chromatography multi-dimensional combined analysis system to obtain multi-dimensional chromatographic data containing volatile and non-volatile components. According to the present invention, with the liquid chromatography-gas chromatography-supercritical fluid chromatography multi-dimensional combined analysis system, the separation problem of the aroma components with similar structures can be effectively solved, and compared with the traditional technology, the separation degree is significantly improved, and the volatile and non-volatile component information in the essence can be completely obtained.

The invention discloses a Brazilian splitting experiment device and method based on multiple heating modes, and belongs to the technical field of splitting experiments. Comprising a base, a Brazilian splitting clamp, a kettle body, a heating system, a heat transfer fluid injection hole, an axial pressure head, a temperature and pressure monitoring and heat transfer fluid outlet, a magnetic particle imaging system and a high-temperature early warning system, the temperature and pressure monitoring and heat-carrying fluid outlet is used for being connected with an external real-time observation system to conduct temperature and pressure monitoring and serves as an outlet of heat-carrying fluid at the same time. The magnetic particle imaging system is used for observing the distribution state of nano magnetic induction particles in the kettle body; the real-time high-temperature Brazilian splitting experiment can be carried out in multiple heating modes such as convection heating, conduction heating and supercritical fluid heating, the generation and expansion process of cracks in a sample can be monitored in real time, and the device is suitable for testing the strength and crack expansion of rocks under the thermal stress condition possibly encountered in actual engineering.

The invention belongs to the field of silicon-carbon negative electrode material manufacturing, and particularly relates to a preparation method of a vapor deposition silicon-carbon material based on supercritical carrier gas. The method comprises the following steps: carrying out vacuum degassing on a porous carbon material in a heating state, then taking supercritical gas as carrier gas, assisting with ultrasonic vibration, introducing silicon-containing gas to carry out silicon deposition, and repeatedly carrying out operation until the required silicon content is reached; and finally, introducing a carbon source gas for carbon coating to obtain the silicon-carbon composite material with the core-shell structure. According to the preparation method, uniform deposition of silicon in a porous carbon skeleton is realized through silane vapor deposition with supercritical fluid as carrier gas under the assistance of ultrasonic vibration, the first coulombic efficiency is improved, stress concentration and volume expansion in the charging and discharging process are reduced, and the cycling stability is improved.

The invention relates to the technical field of nano silver powder preparation, in particular to a preparation method of high-tap-density and high-purity silver powder. The problems that in the prior art, silver powder is insufficient in purity and low in tap density are solved. The method comprises the following steps: preparing silver nitrate into a solution, carrying out electrolytic pretreatment, and carrying out chemical reduction, coprecipitation and dissolution reduction to obtain a silver powder suspension; the silver powder suspension is subjected to physical vapor deposition, silver vapor is deposited on the surface of the silver powder under the action of argon, and silver powder particles are tightly arranged; preparing an electrolyte from silver nitrate and bismuth nitrate, and carrying out electrolytic refining; and finally, the high-tap-density high-purity silver powder is obtained through ultrasonic dispersion and supercritical fluid drying treatment. By strictly controlling the process sequence and parameters and utilizing the synergistic effect among the processes, impurities are effectively removed, the particle size distribution of nano silver powder particles is optimized, the purity and tap density of the nano silver powder are improved, and the application of the silver powder in conductive materials is optimized.

The inventive concept provides an apparatus for treating a substrate by using a supercritical fluid. In an embodiment, the apparatus may include a process chamber that provides a treatment space, and including a chamber heater that increases a temperature of an interior of the treatment space, a substrate support provided in the treatment space and that supports the substrate, and a substrate heating member that heats a lower surface of the substrate while contacting the lower surface of the substrate.

The invention relates to the technical field of polymer foam materials, in particular to a preparation method of gradient cross-linked pearl wool microcellular foamation.According to a gradient cross-linked network constructed through a two-stage cross-linking technology, collaborative optimization of the performance of a surface layer and the performance of a core part of the material is achieved, a compact three-dimensional net-shaped structure is formed in a high-cross-linking-degree area of the surface layer, and the core part of the material is expanded; the surface hardness, wear resistance and tear resistance of the material are remarkably enhanced, external impact and friction damage are effectively resisted, the low-crosslinking-degree area of the core part retains the moderate movement capacity of a polymer chain, the material is endowed with excellent energy absorption characteristic and flexibility, and the material has good mechanical properties when bearing complex stress. Stress dispersion can be achieved through surface layer-core part synergistic deformation, fracture failure caused by local stress concentration is avoided, meanwhile, a gradient cross-linked network provides a controllable melt strength gradient field for supercritical fluid foaming, and therefore accurate control over the size and distribution of foam holes is achieved in the single-time foaming process.

The invention discloses a preparation method and application of circumferentially limited supercritical foaming self-packaging TENG, and the preparation method comprises the following steps: uniformly mixing a PDMS precursor and a curing agent, pouring the mixture into a mold, and putting the mold into a vacuum oven for curing to obtain a PDMS film; adhering the PDMS film to the middle position of the PI film through a double-sided nickel conductive adhesive tape, then putting the PDMS film into a mold, putting a thermoplastic elastomer on the upper layer, and performing hot pressing by using a vacuum auxiliary hot press to obtain a prefabricated sample; putting the prefabricated sample into a supercritical foaming reaction kettle, controlling the temperature to 70-130 DEG C, injecting supercritical fluid into the foaming reaction kettle, after the prefabricated sample and the supercritical fluid form a saturated and stable blending system, maintaining for 0.8-1.5 hours, taking out the blended system, and naturally cooling to room temperature, so as to obtain the TENG. The preparation method has the beneficial effects that the self-assembled and self-packaged TENG with the bionic dome structure is successfully prepared through cooperation of a supercritical fluid technology and a limited foaming strategy, and the technical scheme of the self-assembled and self-packaged TENG obtains breakthrough progress in the aspects of the preparation process, the structural design and the environmental adaptability.

The invention discloses an environment-friendly PP filling strip for a submarine cable and a preparation method of the environment-friendly PP filling strip, belongs to the technical field of polypropylene resin processing, and aims to solve the technical problem that the chemical stability and the mechanical strength of a PP filling strip for a submarine cable in the prior art need to be further improved. The modified polypropylene resin comprises the following components in parts by weight: 100-120 parts of modified polypropylene resin, 1-5 parts of an antioxidant, 5-10 parts of a lubricant and 5-10 parts of a seawater protective agent, cross-linked polypropylene resin is obtained through polymerization, and a modified filler is prepared and is subjected to blending heat treatment with the cross-linked polypropylene resin to obtain the modified polypropylene resin. Melting and extruding with auxiliary materials to obtain a PP filling strip precursor, and foaming through carbon dioxide supercritical fluid to obtain the temperature-resistant, high-chemical-stability, high-whiteness, wear-resistant and high-toughness PP filling strip for the submarine cable.

The invention relates to the technical field of plastic molds, in particular to an integrated design method and system for a three-dimensional simulation model of a plastic mold. The method comprises the following steps: carrying out geometric scanning on a plastic mold cavity, and setting mold foaming simulation configuration data; acquiring processing parameters of the plastic mold; based on the mold foaming simulation configuration data and the plastic mold processing parameters, constructing a plastic mold initial simulation model; performing plastic melt flow-foaming injection simulation by using the initial simulation model of the plastic mold to obtain injection flow field state data; analyzing an abnormal area of the injection flow field according to the state data of the injection flow field; and according to the abnormal area of the injection flow field, abnormal area plastic process parameter optimization is carried out, plastic process optimization parameters are generated, and the integrated design of the injection filling stage of the plastic mold is achieved. Full-time coupling of a mold structure and a flow field is achieved through numerical simulation of the plastic fluid mold, and the quality stability and the yield of a supercritical fluid micro-foaming product are remarkably improved.

The invention discloses a supercritical fluid assisted polymer devolatilization distributor. The supercritical fluid assisted polymer devolatilization distributor comprises a gradually-shrinking channel, a throttling channel and a gradually-expanding channel which are connected in sequence. A static mixer is arranged in the throttling channel, the upstream pressure is maintained to be above a supercritical state by increasing fluid resistance, meanwhile, the mixing effect of supercritical fluid and polymer melt is enhanced, stable and uniform foam flow is formed, and pressure fluctuation is avoided; an automatic pressure relief valve assembly is arranged on the upper portion of the divergent channel and composed of a valve opening, a valve cover plate, a spring, an adjusting knob and the like, when the system pressure exceeds a set value, exhaust is automatically started, and controllable pressure relief is achieved. A plurality of rows of flow distribution holes are formed in the lower part of the distributor to ensure that the melt uniformly flows out to form stable melt strips; the problems that traditional equipment is difficult to pressurize and not timely in pressure relief are solved, the supercritical state maintenance, gas-liquid separation and melt forming processes are optimized, the volatile component removal efficiency is improved, the phenomenon that melt strips are broken or accumulated is effectively prevented, and continuous and stable operation of the devolatilization process is guaranteed.

The invention provides an antistatic agent for fuel oil and a preparation method thereof, and belongs to the technical field of petrochemical engineering, and the preparation method comprises the following steps: S1, adding soybean lecithin and chlorosulfonic acid into dichloroethane, uniformly mixing, under the protection of nitrogen, heating and stirring for reaction, neutralizing reaction liquid, and performing rotary evaporation to obtain sulfonated soybean lecithin; the preparation method comprises the following steps: adding sulfonated soybean lecithin and ethidene diamine into absolute ethyl alcohol, then adding p-toluenesulfonic acid, heating and stirring for reaction, and carrying out reduced pressure distillation to obtain modified soybean lecithin; s2, dispersing the SiO2 particles in absolute ethyl alcohol, adding KH-550, and performing ultrasonic treatment, centrifugation and drying to obtain pretreated SiO2 particles; and uniformly mixing the modified soybean lecithin and the pretreated SiO2 particles, adding the mixture into a supercritical fluid reactor, heating and pressurizing, ultrasonically dispersing, and drying to obtain the antistatic agent. The antistatic agent has the advantages of good dispersibility, strong stability and strong antistatic capability.

A method for producing high quality exfoliated layered materials may include loading a layered material powder into a variable-volume reactor, injecting a pressurized fluid into the variable-volume reactor, increasing the temperature of the variable-volume reactor to a predetermined temperature, increasing the pressure of the variable-volume reactor up to a pressure higher than the critical pressure of the pressurized fluid at the predetermined temperature by reducing the volume of the variable-volume reactor, obtaining an intercalated layered material powder by maintaining the temperature and pressure condition within the variable-volume reactor for a predetermined amount of time, and exfoliating the intercalated layered material powder by expanding the pressurized fluid within the variable-volume reactor by increasing the volume of the variable-volume reactor. The reactor and method may be configured to perform supercritical extraction and nanoparticle production processes as well.

Oil lubricated supercritical fluid pumps with oil separators are disclosed herein. An example pump system to pressurize a fluid within a closed loop thermal transport bus disclosed herein includes a pump housing, a duct fluidly coupled to the pump housing, a first portion of the duct to include a mixture of an oil and the supercritical fluid, a second portion of the duct to include the supercritical fluid, and a separator positioned in a third portion of the duct between the first portion of the duct and the second portion of the duct, the separator to separate the oil in the mixture from the supercritical fluid.

The invention discloses a preparation method of high-foaming-ratio high-temperature-resistant and solvent-resistant foam. The preparation method comprises the following steps: carrying out melt blending on a matrix and a plasticizer, and molding to obtain a blend profile; the plasticizer is prepared from at least one of diphenylmethane diisocyanate and polymethylene polyphenyl polyisocyanate; the blend profile is placed in supercritical fluid, and polymer foam is obtained through pressure maintaining, pressure relief and cooling shaping; the pressure relief time is 5-10 seconds; and placing the polymer foam in water for cross-linking and curing to obtain the high-temperature-resistant and solvent-resistant foam with high foaming ratio. The high-temperature-resistant solvent-resistant foam with the high foaming ratio can reach the ultra-low density of 0.052 g / cm < 3 >, the processing temperature is far lower than the glass-transition temperature of a matrix, and the high-temperature-resistant solvent-resistant foam has good solvent resistance and excellent high-temperature mechanical properties.

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 embodiment of the invention provides a calculation method and device for boundary parameters of a supercritical fluid heat exchanger, computer equipment and a medium, and relates to the technical field of fluid mechanics and heat transfer science calculation.The method comprises the following steps that design parameters and target working conditions of the heat exchanger are obtained; calculating to obtain the single section length of each infinitesimal section; based on the initial inlet pressure guess value, according to the length of the single section and the pressure and the temperature of the infinitesimal section i, the pressure and the temperature of the infinitesimal section i + 1 are obtained through calculation, the difference value between the outlet calculation pressure and the target outlet pressure is calculated, and the difference value serves as a pressure error; if the pressure error is greater than the convergence tolerance, updating the inlet pressure guess value by adopting a numerical iteration method, and performing iteration again based on the inlet pressure guess value after iteration; otherwise, iteration is terminated, and the final inlet pressure value and the final outlet temperature value are output. According to the scheme, the calculation efficiency and accuracy of solving the inlet pressure and the outlet temperature of the supercritical fluid heat exchanger under the given target outlet pressure are improved.

The invention belongs to the technical field of high-performance polymer materials, and relates to thermal-crosslinkable polyimide, polyimide foam and a preparation method and application thereof. Aiming at the problem that the foaming performance of the existing polyimide foaming material is poor due to the fact that the melt strength and the chain segment activity are difficult to balance, the invention provides a method for regulating and controlling the rheological property by controlling the number-average molecular weight (Mn = 15-45kDa) of a precursor and introducing a thermally-crosslinkable end-capping group. The precursor can form a parison with a specific elastic network structure through hot-pressing cross-linking, and then the polyimide foam which is high in foaming rate, uniform and fine in foam hole, low in density and excellent in heat resistance can be prepared through a two-step method of supercritical fluid saturation pressure relief and high-temperature secondary foaming. The method realizes predictable control from molecular parameters to foaming performance, is suitable for various thermoplastic polyimide systems, and has a wide application prospect in the fields of aerospace heat insulation and the like.

The invention relates to the technical field of high polymer material processing, and discloses an efficient polyester fiber continuous production method based on multi-screw cooperation, which comprises the following steps: S1, raw material pretreatment and conveying: carrying out multi-stage filtration on a polyester raw material, and simultaneously directly conveying supercritical fluid to a feed port of a multi-screw extruder through a closed pipeline; s2, adding a catalyst: adding an organic metal complex catalyst before the polyester raw material enters a reaction extrusion stage; s3, carrying out multi-screw synergistic reaction; s4, data acquisition and analysis; s5, performing dynamic adjustment and feedback; s6, separating and recycling; and S7, spinning and post-processing. Through cooperation of multiple screws and the supercritical fluid and the catalyst, impurities in the raw materials can be dissolved, the activation energy of the reaction can be reduced, the purity of the raw materials can be improved, the viscosity of the materials can be reduced, the flowability is improved, uniform mixing of the raw materials and the catalyst is promoted, the reaction activity is remarkably enhanced, and a foundation is laid for subsequent efficient polymerization reaction; the quality and the production efficiency of the polyester fibers are improved.

The invention discloses a process for preparing a single-walled carbon nanotube and graphene by stripping a multi-walled carbon nanotube, which is characterized in that a supercritical CO2 fluid circulating system, ultrasonic equipment, a stirrer, an external heating jacket and a slit shearing circulating system are arranged on a coupling reaction kettle in a matched manner; the method comprises the following steps: filling a mixed solution formed by a multi-walled carbon nanotube and an organic solvent into a coupling reaction kettle, closing a feeding valve, starting a stirrer and ultrasonic equipment, and heating; the supercritical CO2 fluid is input until the pressure reaches 30-35 MPa; starting a slit shearing circulating system to perform circulating shearing; recovering CO2 after more than 80% of the multi-walled carbon nanotubes are stripped; and respectively unloading to finish the stripping process. According to the method, mature and low-cost multi-walled carbon nanotubes are used as raw materials, the single-walled carbon nanotubes and graphene are prepared by stripping the multi-walled carbon nanotubes through ultrasonic waves and slit shearing coupled supercritical CO2 fluid, the technological process is short, the production efficiency is high, the product increment is large, and the economic benefit is remarkable.

The invention relates to the technical field of dielectric ceramic powder preparation processes, in particular to a multilayer ceramic capacitor, high-activity nano barium titanate powder for the multilayer ceramic capacitor and a preparation method of the high-activity nano barium titanate powder, and the method comprises the following steps: (1) reacting soluble barium salt with a precipitator to obtain barium carbonate precursor particles with high specific surface area; (2) uniformly coating the surfaces of the barium carbonate precursor particles with nano titanium dioxide particles by using a supercritical fluid flash evaporation technology to form a composite precursor; and (3) carrying out solid-phase synthesis reaction on the composite precursor, and sintering to obtain the nano barium titanate powder. Through the synergistic effect of two means of high-activity precursor preparation and nanoscale uniform coating, the composite precursor with extremely high specific surface area, surface energy and microcosmic uniformity is prepared, the thermal sintering temperature is effectively reduced, abnormal growth of crystal grains and lattice distortion are restrained, and the preparation method has the advantages that the preparation process is simple, and the preparation cost is low. The tetragonality of the nano barium titanate powder is obviously improved.

The present application relates to the technical field of dielectric ceramic powder preparation, and particularly relates to a multilayer ceramic capacitor, a high-activity nano-barium titanate powder for the multilayer ceramic capacitor and a preparation method of the high-activity nano-barium titanate powder, the method comprising the following steps: (1) reacting a soluble barium salt with a precipitator to obtain barium carbonate precursor particles with high specific surface area; (2) uniformly coating nano-titanium dioxide particles on the surface of the barium carbonate precursor particles by using a supercritical fluid flash technology to form a composite precursor; and (3) performing a solid-phase synthesis reaction on the composite precursor and sintering to obtain nano-barium titanate powder. The present application, through the synergistic effect of the two means of "high-activity precursor preparation" and "nano-level uniform coating", prepares a composite precursor with extremely high specific surface area, surface energy and micro-uniformity, effectively reduces the heat sintering temperature, suppresses abnormal grain growth and lattice distortion, and significantly improves the tetragonality of the nano-barium titanate powder.

The invention belongs to the technical field of high polymer materials, and discloses a two-component polyurethane pouring sealant and a preparation method thereof.The two-component polyurethane pouring sealant comprises a component A and a component B. The component A comprises, by weight, 40-60 parts of bio-based polyether polyol, 10-15 parts of boron nitride nanosheets, 5-10 parts of graphene modified epoxy resin, 1-3 parts of a silane coupling agent and 0.5-1.5 parts of a supercritical fluid foaming agent; the component B is prepared from 30 to 50 parts of carbodiimide modified MDI (methylene diphenyl diisocyanate), 10 to 20 parts of dendritic polyurethane cross-linking agent and 2 to 5 parts of nano aluminum hydroxide filler; the mixing ratio of the component A to the component B is (2-3): 1; the invention aims to provide the two-component polyurethane pouring sealant and the preparation method thereof, and through material innovation and process integration, the two-component polyurethane pouring sealant which is high in heat conductivity, environment-friendly, weather-resistant and low in internal stress is provided.

The invention discloses a polymer foamed sheet as well as a preparation method and application thereof, and relates to the technical field of foamed materials. According to the preparation method of the polymer foamed sheet provided by the invention, firstly, the polymer particles with specific morphology are mixed, hot pressed and sintered to obtain the sheet with certain porosity, and then the sheet is foamed and sintered to form pores in the sheet, so that diffusion of supercritical fluid is accelerated; according to the preparation method, rapid and efficient preparation of the polymer foamed board can be achieved, the obtained foamed polymer board has abundant foam holes with high uniformity in size and distribution, the foaming ratio can reach 8.3 times or above, the density is low, the light weight characteristic is excellent, the large-scale application prospect is achieved, meanwhile, the good heat insulation characteristic is achieved, and the application prospect is wide. The heat conductivity coefficient is not higher than 0.09 W m <-1 > K <-1 >.

The invention relates to the technical field of surface treatment, discloses a dust-free cleaning process for an AL meltallizing coating, and aims to overcome the defects of an existing cleaning process for the AL meltallizing coating in the aspects of removing particles in micro-pores and passivating tips prone to falling off. The process comprises the steps of ultrapure water pre-cleaning, supercritical fluid deep cleaning, plasma surface modification, high-purity inert gas microjet purging and high-temperature vacuum degassing and surface stabilization. By the adoption of the technical scheme, the cleanliness of the AL meltallizing coating can be remarkably improved, particles and organic pollutants in micro-pores can be thoroughly removed, tips prone to falling off are passivated, secondary pollution is avoided, the cleaning period is shortened, and the production yield of semiconductors and liquid crystal panel products and the equipment utilization rate are increased.

A method of manufacturing a semiconductor device includes: transporting a wafer to a first processing device; developing a photoresist layer on the wafer with a developer using the first processing device; transporting the wafer to a chamber of a second processing device; and removing the developer remaining on the wafer by supplying a processing fluid in a supercritical fluid state to the second processing device using a fluid supply device.

The invention belongs to the technical field of pharmaceutical preparations, and particularly relates to a beclomethasone propionate suspension for inhalation and a preparation method of the beclomethasone propionate suspension. The preparation method of the beclomethasone propionate suspension for inhalation mainly comprises the following steps: S1, preparing sterile beclomethasone propionate particles by using a supercritical fluid rapid expansion method, and collecting the sterile beclomethasone propionate particles into a sterile glass beaker; s2, adding sterile water in which a surfactant is dissolved, and dispersing by ultrasonic dispersion equipment; s3, preparing an auxiliary material solution of beclomethasone propionate, and filtering by using a sterile filter membrane; s4, mixing the solution in the step S2 and the solution in the step S3, and dispersing by using ultrasonic dispersion equipment; and step S5, filling and sealing into an ampoule bottle to prepare the beclomethasone propionate suspension for inhalation. The beclomethasone propionate suspension for inhalation is more uniform in particle size distribution and good in stability, the preparation process is carried out under relatively mild conditions, and the technological operation is simple and convenient.