518 results about "Microwave assisted" patented technology

The invention relates to the technical field of sole processing, in particular to a sole composite processing method, which comprises the following steps: according to the rigidity requirement of an arch support area, preparing high-density slurry in which silicon nitride ceramic powder accounts for 30-40%, forming # imgabs0 # crystal phase through microwave-assisted sintering, and controlling the porosity to be 10-20%; according to the energy rebound requirement of the forefoot buffer area, graphene oxide / carboxymethyl cellulose aerogel powder is added into the slurry until the concentration is 25%, and the porosity is increased to 40-60% by combining the honeycomb porous network design; a nano silicon dioxide reinforcing agent is introduced into a wear-resistant area of the heel to 15%, a diamond-like carbon coating is formed through plasma surface treatment, and the porosity is limited to be 5-15%. According to the invention, silane is encapsulated by adopting polyurea microcapsules, and is released only when the material is damaged, so that dynamic self-repairing is realized, the shoe sole is endowed with dynamic repairing capability, and the service life is prolonged.

The invention relates to an integral microwave-assisted additive manufacturing device and method. The integral microwave-assisted additive manufacturing device comprises a microwave high-temperature cavity, a microwave leakage-proof outer cavity, a microwave element, a high-temperature thermocouple, a high-temperature supporting mechanism and a servo driving mechanism. The microwave auxiliary device is fixed to the supporting frame, and the servo driving mechanism drives the forming base plate to move synchronously through the high-temperature supporting mechanism. According to the device and the method, an additive manufacturing component can autonomously absorb microwaves in a forming high-temperature state, microwave energy is converted into heat energy, rapid temperature rising of the material is achieved, meanwhile, under the synergistic effect of microwave coupling external heat sources, synchronous preheating and slow cooling inside and outside the material are achieved, thermal stress in the forming process is reduced, and therefore material cracking is effectively restrained. The heating temperature and the heating rate are regulated and controlled by controlling the microwave power, so that on-demand preparation of the microstructure of the material is realized; the microwave plasma heat effect and the electric field enhancement effect in the microwave heating process can promote densification of a formed component, and the overall performance of the material is remarkably improved.

The invention relates to a preparation technology of a gel polymer lithium ion battery cell electrolyte, and belongs to the field of battery preparation technologies, the preparation technology comprises the following steps: mixing methacrylate monomers and silane monomers according to a mass ratio of 3: 1-5: 1, adding 1-3% of an initiator, and carrying out prepolymerization at 60-80 DEG C for 1-3 h to prepare a prepolymer solution; mixing with a non-aqueous solvent containing lithium hexafluorophosphate according to a mass ratio of (1: 4)-(1: 6) to form a precursor mixed solution, and controlling the injection rate to be 1.5-2.5 g / Ah to a gap between a battery cell pole piece and a diaphragm; after standing for 2-4 hours at the vacuum degree of less than or equal to-0.08 MPa, curing for 3-6 hours at the temperature of 60-70 DEG C to form a gel polymer electrolyte; the wettability is improved through pole piece surface hydrophilic treatment, 1-5% of vinylene carbonate is added to optimize an SEI film, the prepolymerization temperature fluctuation is controlled to be smaller than or equal to + / -2 DEG C through microwave-assisted heating, the pressure of 0.2-0.5 MPa is applied after injection to promote uniform permeation, a polyvinylidene fluoride coating of 5-10 microns is coated after curing to enhance protection, and the interface performance is ensured through an alternating-current impedance test.

The invention relates to the technical field of glass strengthening, in particular to a microwave-assisted glass strengthening process which comprises the following steps: (1) a preheating stage: preheating glass to 300-350 DEG C for 30-60 minutes by adopting microwaves; (2) superficial layer exchange stage: putting the glass into first fused salt, strengthening for 1-2 hours at the temperature of 390-410 DEG C, and simultaneously adopting low-frequency microwave to assist in strengthening; and (3) a deep exchange stage: putting the glass into second fused salt, strengthening at the temperature of 420-430 DEG C for 3-4 hours, and meanwhile, adopting high-frequency microwaves to assist in strengthening. According to the method, the temperature difference between the surface and the interior is reduced by adopting microwave-assisted glass strengthening and microwave penetrability heating, and microcracks caused by local overheating can be avoided, so that the uniformity of an ion exchange layer is improved, and the method is suitable for strengthening various special-shaped glass; microwaves directly act on reactants, so that the ion exchange time can be shortened by 40-60%, the energy consumption is reduced, and the efficiency is improved.

The invention relates to the field of caprolactam production, and discloses a green and efficient production process and device. The process comprises the following steps: continuously oximating cyclohexanone and hydroxylamine in a microreactor under the catalysis of mesoporous silica solid acid; carrying out gas phase rearrangement on cyclohexanone-oxime in the presence of a ZSM-5 molecular sieve under the assistance of microwaves; coupling, rectifying and purifying the crude product through a four-stage molecular sieve membrane; and performing catalytic cracking on the by-product to obtain N2 / H2O and recycling. The device comprises a micro-reaction unit, a microwave-radial reactor, a membrane coupling rectifying tower group and a tail gas cracking unit. Zero emission of ammonium sulfate is achieved, the product purity is larger than or equal to 99.95%, and energy consumption is reduced by 45%.

The invention relates to the technical field of composite resin preparation, and discloses a silicon-molybdenum alloy target material preparation method which comprises the following steps: preparing raw materials, selecting molybdenum powder and silicon powder with the purity not lower than 99.9%, mixing, putting the raw materials into a vacuum mixer, vacuumizing to 0.01-0.1 Pa, stirring for 1-5 hours, carrying out ultrasonic assistance, controlling the temperature to 25-40 DEG C to prevent oxidation, and carrying out a forming process. Filling the mixed powder into a detachable hard alloy mold coated with a 0.05-0.2 mm boron nitride coating, carrying out cold press molding, maintaining the pressure for 5-20 minutes to obtain a biscuit, sintering, putting the biscuit into a vacuum sintering furnace, firstly carrying out microwave-assisted heating, then raising the temperature to 1500-1800 DEG C, introducing trace argon in the later period to regulate and control a structure, carrying out a post-treatment process, carrying out numerical control processing on a sintered target material, carrying out chemical cleaning on the mixed solution of hydrofluoric acid and nitric acid, and finally carrying out vacuum sintering. Performing plasma treatment; and finally, performing vacuum packaging and filling high-purity nitrogen. The raw materials are high in purity and excellent in granularity; uniformly mixing and preventing oxidation; forming and sintering are precisely controlled, and the quality of the target material is guaranteed; the surface performance is improved through post-treatment, packaging is oxygen-proof and moisture-proof, and the target material meets the high-end industry requirement.

The invention relates to the technical field of grain and oil processing, in particular to a flaxseed microwave-assisted wall breaking and nitrogen protection cold pressing process. The method comprises the following steps: putting flaxseeds into a microwave bin, carrying out intermittent microwave treatment, and carrying out blank rolling treatment on the flaxseeds by adopting a double-helix blank rolling mill to obtain crude oil; and after degumming, deacidifying, decolorizing and deodorizing the crude oil, filtering the crude oil to obtain refined oil. According to the method, the flaxseed cell wall rupture rate is increased through microwave pretreatment, more grease can be released, the grease flow resistance can be reduced, the released grease can be rapidly separated from a fiber network and resorption is reduced through a nitrogen-assisted pressing mode, and after first-time cold pressing, oil cakes are subjected to secondary microwave treatment, so that the flaxseed oil yield is improved. The method can further destroy residual cell structures, and can prevent oil cake hardening caused by oxidation under the protection of nitrogen, so that the oil yield during secondary repressing is increased.

The invention relates to a purification method of high-purity diamond, and relates to the technical field of diamond purification. The purification method comprises raw material pretreatment, microwave-assisted ionic liquid stripping, solid-liquid separation and ionic liquid recovery, deep purification, separation and drying, and the raw material pretreatment comprises the following steps: crushing an impurity-containing coarse diamond raw material into particles of 2-5mm, then carrying out wet ball milling in ethanol for 4-6 hours, refining the particles to 50-200 microns, and carrying out microwave-assisted ionic liquid stripping on the particles to obtain refined particles; immersing the particles into a mixed solution of 10% diluted hydrochloric acid and 2% ammonium bifluoride, performing ultrasonic treatment for 2 hours, and performing centrifugal washing with ultrapure water until the particles are neutral; the microwave-assisted ionic liquid stripping method comprises the following steps: mixing the pretreated raw material with an ionic liquid according to a mass ratio of 1: (5-10), and carrying out microwave treatment for 10-30 minutes to obtain a reaction mixture. According to the purification method, diamond impurities are efficiently removed, meanwhile, the surface structure of the diamond can be protected against damage, waste liquid can be recycled, and the influence on the environment is small.

The invention relates to a textured KCu7S4 thermoelectric material and a preparation method thereof, and the method comprises the steps: sequentially adding a prepared KOH aqueous solution, CuCl2. 2H2O and Na2S. 9H2O into a high-pressure kettle, and fully stirring for dissolving; dropwise adding an N2H4.H2O aqueous solution into the mixed solution, fully stirring, sealing, transferring to a microwave chemical synthesis instrument, heating, keeping stirring, and reacting at a target temperature and self-generated pressure to generate a KCu7S4 nanowire preferentially growing along a [001] crystal orientation; and after the reaction is finished and natural cooling is carried out, a product is collected through centrifugation, full cleaning and vacuum drying are carried out, and then the KCu7S4 thermoelectric material with [001] preferred orientation in the direction perpendicular to the pressure direction is obtained through spark plasma sintering. According to the method, a surfactant and an organic solvent are not used, and macro, rapid, efficient and controllable preparation of the KCu7S4 nanowire is realized through a low-temperature, low-cost and low-energy-consumption microwave-assisted hydrothermal process.

The invention relates to the technical field of carbon black materials, and discloses special carbon black with high specific surface area and a preparation method thereof, and the special carbon black is prepared by pyrolysis and activation treatment of a precursor mixture, a catalyst and a template agent. The precursor mixture contains a biomass refined product, waste polymer pyrolysis oil and a copolymer template agent, and the performance is optimized through a rotating flow field high-temperature reactor and a microwave-assisted activation process. The carbon black has a hierarchical porous structure, the specific surface area reaches 2000-2500m < 2 > / g, the conductivity is improved by 1-2 orders of magnitude, and the chemical properties can be regulated and controlled through surface functionalization. The low-cost and sustainable production is realized, the mechanical strength, the conductivity and the adsorption performance are remarkably improved, and the requirements of the high-end field are met.

The invention relates to a preparation method of a microwave-assisted synthesized near-infrared electrochemical luminescence gold nanocluster and application of the gold nanocluster in miRNA (micro Ribonucleic Acid) detection. The preparation method comprises the following steps: under a stirring condition, adding a gold source and alkali into a Met solution to obtain a mixed solution, carrying out microwave irradiation reaction, and carrying out solid-liquid separation to obtain a Met-Au NCs solution; the preparation method comprises the following steps: activating a Met-Au NCs solution by using EDC and NHS, adding a DNA solution, mixing, and dialyzing to obtain a Met-Au NCs-DNA compound, namely the near-infrared electrochemical luminescence gold nanocluster. Compared with Au NCs prepared by a common mild method, the Met-stable Au NCs prepared by a microwave-assisted method has the advantage that the fluorescence and electrochemical luminescence efficiency at 835 nm is improved. The invention also provides a'signal closing 'ECL (electron cyclotron ligand) biosensor for high-sensitivity detection of the miRNA-107 (MicroRNA-107), and a method for detecting the miRNA-107 (MicroRNA-107). The sensor is simple to operate and good in repeatability, and has important scientific significance and application value for clinical early diagnosis of cancers.

The invention relates to a carbon carrier material for microwave-assisted phosphoric acid treatment and oxygen reduction, a catalyst, a preparation method and application thereof, and the scheme is innovated by the following steps: dipping conductive carbon black (such as ketjen black ECP600JD) and 60-70wt% phosphoric acid solution according to a solid-to-liquid ratio of 1g / (15-18) mL, preheating at 100-250 DEG C in an argon atmosphere, then carrying out a reaction for 10-100 seconds under the assistance of a microwave power of 100-600 W, and carrying out vacuum drying to obtain the carbon carrier material for microwave-assisted phosphoric acid treatment and oxygen reduction. The phosphorus content of the prepared carbon carrier material is 4-6wt%, and the graphitization degree of the carbon carrier material is improved (ID / IG value is 1.15-1.20). And after the platinum-cobalt alloy is further loaded, the particle size of the nanoparticles is uniform, the potential loss is only 3 mV after 5000 accelerated attenuation tests in the proton exchange membrane fuel cell, and the power density attenuation is reduced by 58%. The method has the advantages of quick reaction, low energy consumption, high corrosion resistance and the like, and the stability of the catalyst is remarkably improved.

The invention relates to a preparation method of small-molecular-weight sea cucumber oligopeptide, the prepared sea cucumber oligopeptide and application, and belongs to the technical field of skin care products. The preparation method of the small-molecular-weight sea cucumber oligopeptide comprises the following steps: preparing sea cucumber fine powder; adding the sea cucumber fine powder into ultrapure water, adding papain and EDTA (Ethylene Diamine Tetraacetic Acid), and carrying out enzymolysis under the assistance of microwaves; adding trypsin and calcium ions, and carrying out enzymolysis under the assistance of microwaves; adding neutral protease and zinc ions, and performing enzymolysis under the assistance of microwaves to obtain final sea cucumber enzymatic hydrolysate; and decolorizing, separating and purifying, and freeze-drying to obtain the powdery small-molecular-weight sea cucumber oligopeptide. According to the preparation method of the small-molecular-weight sea cucumber oligopeptide, microwave heating and enzymolysis reaction are combined, the hydrolysis degree of a peptide chain is regulated and controlled by controlling an enzyme hydrolysis sequence and enzymolysis conditions, the small-molecular-weight sea cucumber oligopeptide with relatively concentrated and moderate molecular weight is prepared, and good biological activity of the sea cucumber oligopeptide is kept.

The invention relates to the field of environmental engineering and waste recycling, in particular to a method for detecting and recycling copper ions through carbon dots, amines and acids are used as precursors, the carbon dots with fluorescence are prepared through a microwave-assisted thermal method, the prepared carbon dots are used for quantitative fluorescence sensing and flocculation recycling of II-valent copper ions, and the method for detecting and recycling the copper ions through the carbon dots is suitable for industrial production. The higher the concentration of the II-valent copper ions is, the lower the fluorescence intensity is, a standard linear relation exists between the two, in addition, the obtained carbon dots can also be combined with the II-valent copper ions to form a complex to generate flocculation and calcination to obtain copper oxide, and the II-valent copper ions in the waste are recycled; the preparation method of the carbon dots is simple and efficient, large-scale batch preparation can be achieved, the carbon dots can achieve accurate detection of the II-valent copper ions, the detection limit is extremely low, accurate separation and extraction of the II-valent copper ions can be achieved, the recovery efficiency is high, the cost is low, and practicability is high.

The present invention relates to the technical field of lithium-ion battery recycling and utilization, and specifically discloses a method for recycling and regenerating positive electrode materials from waste ternary lithium-ion batteries. The present invention uses a ternary deep eutectic solvent combined with microwave-assisted leaching to efficiently leach waste lithium-ion battery positive electrode materials, and then combines subsequent precipitation and adjustment of the molar ratio of metal elements to regenerate the positive electrode materials. The obtained recycled and regenerated positive electrode materials have good electrochemical properties. The technical solution provided by the present invention effectively solves the problems of high cost and complicated process flow of the existing method for recycling metals from waste ternary lithium-ion batteries, and the problem that when the recovered metals are used to prepare lithium battery positive electrode materials, the purity is insufficient, resulting in poor effect of the regenerated positive electrode materials. It provides a new idea for the treatment of waste ternary lithium-ion batteries.

The invention provides a heavy oil thermal-flow coupling development experimental device and method based on microwave-assisted gravity drainage, and belongs to the field of oil-gas field development. The experimental device comprises a three-dimensional oil reservoir simulation system, a microwave-assisted heating system, a horizontal well injection-production regulation and control system and a multi-field monitoring system; the microwave auxiliary heating system comprises a microwave generation regulation and control system, a microwave transmission system and a shaft integrated microwave radiator, the microwave generation regulation and control system comprises an industrial grade microwave generator, a power regulator and a PLC, and the microwave transmission system comprises a microwave coaxial cable and a microwave waveguide tube bundle; and the microwave generator is continuously connected with the microwave waveguide tube bundle and the shaft integrated microwave radiator. According to the heavy oil thermal-flow coupling development experimental device and method based on microwave-assisted gravity oil drainage, the technical problems that an existing deep heavy oil thermal recovery experimental device cannot reproduce a'thermal-flow-force 'multi-field coupling environment, the microwave heating adaptability is poor, and the experimental scale and the field deviation is large are solved. The heavy oil thermal-flow coupling development experimental device and method based on microwave-assisted gravity oil drainage solve the technical problems that an existing deep heavy oil thermal recovery experimental device cannot reproduce the'thermal-flow-force' multi-field coupling environment.

The invention belongs to the technical field of road maintenance, and discloses a road concrete pavement layer self-adaptive crushing method based on microwave-assisted resonance, and the specific technical scheme is as follows: a microwave heating device is used for pretreating a cut and divided crushing area, and a concrete layer is weakened through a heating effect of microwave radiation to realize separation of a pavement layer; when it is judged that the temperature of the concrete in the heating area reaches the needed temperature through the thermal infrared imager, the inherent frequency of the concrete is calculated, a calculation result is fed back to the resonance crushing device, and the resonance crushing device enables the pavement layer to generate forced vibration to be crushed by generating excitation frequency; the novel method for crushing the concrete pavement layer based on microwave-resonance energy coupling has the characteristics of being accurate, controllable, efficient, applicable to multiple scenes and the like, and can be matched with an acoustic emission system to realize closed-loop control of concrete crushing, so that the working environment of the concrete pavement layer is greatly improved, and the service life of the concrete pavement layer is prolonged. And the maintenance frequency of the equipment is greatly reduced while the crushing efficiency is improved.

The invention provides a thermogravimetric analysis device and method for microwave-assisted carbon dioxide capture. The thermogravimetric analysis device comprises a gas conveying and switching unit, a microwave-assisted reaction unit, a temperature measuring unit, a weight recording unit and a gas analysis unit. According to the thermogravimetric analysis device, mass transfer and heat transfer are more sufficient, microwaves can act on samples in a concentrated mode, the adsorption and desorption efficiency is higher, and gas leakage and microwave leakage can be effectively avoided. According to the thermogravimetric analysis device, effective combination of a microwave heating system and a thermogravimetric analysis system is achieved, the adsorption and desorption capacity of a sample to carbon dioxide can be measured in real time, weight measurement data are more accurate, and the adsorption and desorption conditions of the carbon dioxide can be reflected more comprehensively and visually. The thermogravimetric analysis method for microwave-assisted carbon dioxide capture is carried out in the thermogravimetric analysis device, the method is high in repeatability, and the cyclic stability of adsorption-desorption of carbon dioxide is good.

The invention relates to the field of high polymer material recycling, in particular to a technology for manufacturing a conveyor belt by recycling polytetrafluoroethylene. According to the process, the recycled polytetrafluoroethylene material is classified and collected according to sources and the like, impurities are removed through magnetic separation and electrostatic separation, and then microwave-assisted cleaning and activation are performed; then, a bio-based additive, a degradable polymer, a photocatalytic self-cleaning material and the like are adopted for modification treatment, so that the multi-aspect performance of the material is improved; then, the material is processed into the shape of a conveyor belt through a water-assisted injection molding or hot press molding process, and after molding, post-treatment is carried out through plant extract coating protection, recoverable and easy-to-disassemble design. The process is suitable for the requirements of conveyor belts in multiple fields, resource recycling is achieved, environmental protection and economic benefits are achieved, and the manufactured conveyor belt is excellent in performance and can meet the requirements of different working conditions.

The utility model relates to a microwave-assisted device for preparing a carotenoid microcapsule preparation. The microwave-assisted device comprises an emulsifying tank, a microwave cover and a forming tower, the emulsifying tank comprises a feeding bin, a stirring device and a heating device; the emulsifying tank is sleeved with the microwave cover, microwave generators are further arranged on the two sides of the inner wall of the microwave cover, one side of each microwave generator is fixed to the microwave cover, and the other side of each microwave generator is fixed to the outer wall of the emulsifying tank; the microwave generating device is matched with the heating device in the emulsifying tank, so that the emulsifying efficiency of the prepared raw materials can be improved in a relatively short time. The bottom of the emulsifying tank is communicated with the forming tower through a heating pipeline, a discharge port is formed below the forming tower, and a stock bin trolley is arranged under the discharge port; the fully emulsified preparation raw materials are atomized and dried by the forming tower, and are gathered into the bin vehicle through the discharge port, so that the integration of mixing and emulsifying of the raw materials and preparation of the microcapsule preparation is realized.

The invention discloses a preparation method and application of a wind cap of a circulating fluidized bed gasifier, the wind cap is arranged at the bottom of a gasifier body, the wind cap mainly comprises a wind cap gas inlet, a wind cap gas outlet and a wind cap gas flow channel, and the wind cap gas flow channel is composed of a Tesla valve fluid channel. The air cap is prepared from modified fly ash through a combined method of freezing ball-milling nano modification, 3D printing coupling microwave-assisted sintering and salt bath chromizing strengthening. According to the method, a large amount of solid waste of fly ash can be consumed to realize carbon emission reduction, the efficiency of the circulating fluidized bed can be improved through structural optimization, meanwhile, the preparation cost of the hood can be reduced, and the method has relatively high application and popularization values.

This disclosure describes an apparatus that enables rapid transitions during microwave-assisted magnetic recording (MAMR) of storage media. In various aspects, the apparatus incorporates a driver circuit configured to provide a controlled bias current through separate source and sink output terminals, which respond to feedback signals. An MAMR sensor connects between the source and sink output terminals and generates microwave fields when receiving the controlled bias current from the driver circuit. A common-mode feedback (CMFB) loop connects to the source and sink output terminals, detects common-mode voltage (CMV), and delivers feedback signals to the driver circuit to maintain CMV regulation of the MAMR sensor. A differential voltage regulation loop connects to the source and sink output terminals, providing feedback signals that maintain the MAMR sensor voltage differential at a reference value. The apparatus controls the magnetic recording process of the MAMR sensor with rapid transition times.

The invention discloses equipment and a process for efficiently and continuously extracting astaxanthin by a low-frequency microwave-assisted eutectic solvent method, and belongs to the technical field of bioactive substance extraction. The method for extracting astaxanthin by the low-frequency microwave-assisted eutectic solvent method comprises the following steps: performing low-frequency microwave pretreatment on a eutectic solvent to obtain a high-temperature pretreated eutectic solvent; cooling the pretreated eutectic solvent, then mixing the pretreated eutectic solvent with crustacean byproducts, performing eutectic solvent extraction treatment, performing ultrasonic-assisted extraction in the process, and then performing solid-liquid separation to obtain filtrate; mixing the filtrate with an extraction solvent, and extracting to obtain an extraction solvent phase containing astaxanthin and a eutectic solvent phase; and removing the extraction solvent in the extraction solvent phase containing the astaxanthin to obtain an astaxanthin product.

The invention discloses a molecular sieve membrane capable of improving performance through ion exchange and a preparation method and application thereof, and the preparation method comprises the following steps: S1, dissolving a metal salt in a solvent to prepare a metal ion solution; s2, contacting the molecular sieve membrane with a metal ion solution, and carrying out ion exchange under a microwave-assisted solvothermal condition; and S3, washing and drying the molecular sieve membrane after ion exchange to obtain the molecular sieve membrane with improved performance after metal ion exchange. According to the molecular sieve membrane improved by the method, the permeation flux and / or selectivity are obviously improved, and the molecular sieve membrane not only can be used for dehydration separation of organic solvents, but also can be used for gas separation (such as natural gas decarburization, carbon capture before combustion and collection of ammonia gas in synthetic ammonia) and the like; the method is simple to operate, short in time consumption, low in cost and suitable for large-scale industrial production.

The invention discloses a stropharia rugoso-annulata glycopeptide extraction method, an obtained product and application. The stropharia rugoso-annulata glycopeptide extraction method comprises the following steps: uniformly drying stropharia rugoso-annulata, crushing, sieving, extracting by adopting a microwave-assisted eutectic solvent, filtering out liquid, carrying out alcohol precipitation to obtain glycoprotein, removing free protein from the glycoprotein, decolorizing, and carrying out enzymolysis to convert the glycoprotein into a glycopeptide component. The extraction method of the stropharia rugosoannulata glycopeptide is provided for the first time, and the method is simple in process, low in cost, easy to control, higher in glycopeptide yield and suitable for industrial production. The obtained glycopeptide has excellent antioxidant activity and liver protection activity, and has certain medicinal value in the field of medicines.

The invention relates to the field of comprehensive utilization of biomass resources and preparation of high polymer materials, in particular to a green preparation method of high-deacetylation-degree chitin capable of recycling reaction waste liquid. The invention aims to solve the problems of serious environmental pollution, resource waste, low product purity and incomplete waste liquid recycling in chitin extraction. The method comprises the following steps: by taking crustacean biomass as a raw material, firstly carrying out high-voltage pulse electric field pretreatment to crush the tissue structure of the raw material and improve the reaction activity, and then heating and extracting in a choline chloride-lactic acid deep eutectic solvent system to realize efficient removal of proteins and inorganic salts in the raw material; according to the method, the chitin and the alkali liquor are subjected to a rapid deacetylation reaction by adopting microwave assistance and cooperating with the action of the phase transfer catalyst; according to the method, a waste liquid graded recycling system is adopted, hydrochloric acid in waste acid liquid generated by decalcification is recycled through electrodialysis, alkali liquid is recycled through ultrafiltration-nanofiltration double-membrane combination, deep eutectic solvent components are recycled through reduced pressure distillation, and recycling of acid, alkali and a solvent is achieved.

The invention discloses a method for preparing nano copper powder based on a microwave-assisted reduction method and application. The method comprises the following steps: a) preparing a copper ion solution; b) adding a dispersing agent and a surfactant; c) adding a reducing agent; d) microwave heating reaction; e) separating and purifying a product; and f) drying. According to the method, directional reduction and morphology regulation and control of copper ions are achieved through the synergistic effect of a microwave field and chemical reduction, the specific surface area of the obtained product reaches 25-35 m < 2 > / g, the oxygen content is lower than 0.8 wt%, and excellent performance is shown in the fields of electronic packaging and conductive ink; the method has the characteristics of short reaction time (shortened by 90% compared with the traditional method), low energy consumption (less than 0.5 kWh / kg), no harmful by-product and the like, and meets the requirements of green chemical industrial production.

The invention discloses a microwave-assisted synthesized M-SnO2 / NH2-Zr-MOFs composite material catalyst and a preparation method and application thereof, and belongs to the technical field of catalysts.The preparation method comprises the following steps that 1, a metal source and precursor NH2-Zr-MOFs are mixed in a solvent to be subjected to a microwave-assisted reaction, and a precursor A is obtained; and (2) mixing the precursor A and a tin source in a solvent, and carrying out microwave-assisted reaction again to obtain the M-SnO2 / NH2-Zr-MOFs composite material catalyst. The invention also discloses the catalyst prepared by the preparation method and application of the catalyst in the field of hydrogen production by photothermal synergistic catalysis of methanol-water liquid phase reforming. The unique structural design effectively prolongs the service life of the catalyst, avoids the phenomenon that a traditional catalyst is easy to sinter at high temperature, and enables the catalyst to have wide application prospects in the field of photo-thermal catalysis.

The invention relates to the technical field of oilfield development, in particular to a thick oil viscosity reducer and a preparation method and application thereof. A unique novel nitrogen and sulfur heterocyclic ring-containing monomer is synthesized through multiple steps; the tail end of the amphiphilic block copolymer is silanized, and the nano graphene quantum dots are subjected to microwave-assisted modification. The composite material comprises intelligent response type microcapsules and ionic liquid modified clay. All the components are synergistic, the viscosity can be effectively reduced, and the viscosity reduction effect can be intelligently adjusted under different conditions. The viscosity reduction rate of the thick oil viscosity reducer is high and can reach 70%-90%; the adaptability to complex environment is high, and the preparation process is simple and environment-friendly; and the mining efficiency can be improved, the energy consumption is reduced, the equipment abrasion is reduced, and the economic and environmental benefits are remarkable.

The invention discloses a preparation method of high-capacity X7R type barium titanate-based dielectric ceramic powder, and relates to the field of preparation of barium titanate-based electronic materials, and the preparation method comprises the following steps: pre-synthesizing a rare earth-transition metal composite dopant by adopting a sol-gel method; mixing the obtained rare earth-transition metal composite dopant with a 100-250 nm solid-phase nano barium titanate main material, and adding a glass phase sintering aid; a staged pre-sintering process is adopted; ball-milling the pre-sintered powder by a high-energy ball mill, and sintering in a microwave-assisted atmosphere sintering furnace by adopting a microwave-assisted atmosphere sintering process; according to the design of the composite dopant, atomic-scale uniform doping of rare earth and transition metal is achieved through a sol-gel method, and the problem of component segregation caused by traditional mechanical mixing is solved; a staged pre-sintering process is adopted and is different from traditional single-stage pre-sintering, organic matters are removed in a low-temperature stage to avoid carbon residues, and the grain size is accurately controlled in a high-temperature stage; a contrast experiment shows that the dielectric constant is increased by 15%.