104results about How to "Efficient preparation method" patented technology

The invention provides a preparation method of an MXene (at) BN heterostructure heat-conducting filler and an epoxy composite material thereof, boron nitride and MXene nanosheets are respectively modified by cation and anion modifiers, and the heterostructure filler is constructed by electrostatic self-assembly. When the filler is applied to epoxy resin, the prepared MXene-coated BN / epoxy composite material shows excellent heat conductivity and electrical insulating property. The method provided by the invention is simple and efficient in preparation process, is suitable for large-scale industrial production, can realize the balance of high thermal conductivity and excellent electrical insulation property under low filler load, and provides an innovative efficient heat dissipation solution for the field of electronic packaging.

The invention relates to the field of chemical engineering, in particular to an n-hexane separation technology, and more particularly relates to a method and a device for preparing electronic-grade n-hexane. The method for preparing the electron n-hexane comprises the following steps: S1, introducing an adsorbent into an n-hexane raw material to remove moisture in the n-hexane, and then carrying out catalytic hydrogenation reaction to obtain crude n-hexane; and S2, carrying out primary filtration on the material subjected to catalytic hydrogenation, then carrying out light component removal and heavy component removal two-stage rectification to obtain high-purity n-hexane, and carrying out secondary filtration on the high-purity n-hexane to obtain the electronic-grade n-hexane. The device for preparing the electronic-grade n-hexane comprises a raw material tank, an adsorption tower, a catalytic hydrogenation reactor, an intermediate tank, a light component removal tower, a heavy component removal tower and a product tank which are connected in sequence. According to the preparation method and device, high-purity electronic-grade n-hexane meeting the strict requirements of the semiconductor industry can be produced, the process steps are simple, industrial production is easy to achieve, the product quality is stable and reliable, and high economic and social benefits are achieved.

The invention discloses high-entropy rare earth ceramic powder as well as a rapid preparation method and application thereof. The rapid preparation method of the high-entropy rare earth ceramic powder comprises the following steps: 1) uniformly mixing rare earth oxide powder with one of HfO2 powder, ZrO2 powder, Ta2O5 powder and SiO2 powder to obtain mixed powder; and 2) carrying out laser radiation heating on the mixed powder to obtain the high-entropy rare earth ceramic powder. The high-entropy rare earth ceramic powder has the excellent characteristics of uniform element distribution, no impurity phase, large synthetic component space and the like, and the preparation method has the advantages of universality, simplicity, rapidness, high efficiency and the like, can realize the purpose of high-throughput material screening, is suitable for being used on hot end parts of aerospace engines, and has a very wide application prospect.

The invention discloses a tannin-based food deoxidizer and a preparation method thereof, and belongs to the technical field of food deoxidizers. The components of the tannin-based food deoxidizer at least comprise tannin, and can also comprise other hygroscopic substances and / or alkaline substances. The invention provides a technical scheme of taking tannin as a food deoxidizing agent for the first time, and the provided tannin-based food deoxidizing agent is high in deoxidizing amount and is a natural, green and non-toxic organic deoxidizing agent which does not need catalysts such as transition metal salt and the like. The invention also provides the tannin-based food deoxidizer and the preparation method thereof, and the provided preparation method is simple, convenient, efficient and suitable for wide popularization and application.

The invention relates to the field of medicine preparation, in particular to a compound composition and a preparation method and application thereof. The compound composition comprises a sustained-release layer, a blocking layer and a quick-release layer, the sustained-release layer comprises metoprolol and sustained-release layer auxiliary materials, the blocking layer comprises blocking layer auxiliary materials, the quick-release layer comprises amlodipine, metoprolol and quick-release layer auxiliary materials, and the mass ratio of metoprolol of the quick-release layer to metoprolol of the sustained-release layer is (1-3): (6.5-8.5). According to the compound composition, two antihypertensive drugs with complementary action mechanisms are prepared into the long-acting compound composition which is taken once a day, amlodipine and part of metoprolol are rapidly released, the rest metoprolol is slowly released within 24 hours, and rapid antihypertensive and long-acting antihypertensive requirements are met at the same time. The composition is stable in preparation process, convenient to produce and beneficial to industrial production.

The invention discloses a self-lubricating high-corrosion-resistance composite coating as well as a preparation method and application thereof, and belongs to the technical field of composite coating materials. The preparation method of the self-lubricating high-corrosion-resistance composite coating comprises the following steps: preparing a ceramic-fluoride-based composite coating on the surface of a metal substrate to obtain an intermediate material; the intermediate material is placed in liquid formed by heating and melting the solid-liquid reversible lubricating phase to be subjected to vacuum impregnation, so that the solid-liquid reversible lubricating phase permeates into the structural defects of the ceramic-fluoride-based composite coating; and then cooling and solidifying to solidify the solid-liquid reversible lubricating phase and remain in the structural defect. The preparation method is simple, rapid and efficient, the composite coating which is suitable for seawater or seawater-atmosphere alternating environment and integrates the self-lubricating function and the strong anti-corrosion function can be obtained, and the composite coating has the low friction coefficient and the excellent anti-corrosion performance and can be used for preparing ocean engineering equipment.

The invention relates to a cement-based material with a photocatalytic function, a coating, a casting body and a preparation method, the cement-based material with the photocatalytic function comprises cement-based dry powder, and the cement-based dry powder comprises, by weight, 1-1.5 parts of molybdenum disulfide nanoflowers and 9-19 parts of Portland cement. The preparation method has the beneficial effects that the molybdenum disulfide nanoflower is directly introduced into a cement-based material as a photocatalyst, so that the self-cleaning function and the dye degradation function of the material are increased, the hydration rate and the mechanical property of the cement are improved, and the cement is a green and sustainable building material. The preparation method of the cement-based material with the photocatalytic function is simple and efficient.

The invention provides a polycaprolactone-poly (2-vinyl) ethylene glycol copolymer and a preparation method thereof.The preparation method comprises the steps that raw materials are provided, and the raw materials comprise polycaprolactone containing 1-4 hydroxyl groups and further comprise 4-vinyl-1, 3-dioxocyclopent-2-ketone or vinyl ethylene oxide; the preparation method comprises the following steps: dissolving the raw materials in an organic solvent, and reacting in the presence of a palladium catalyst and a phosphine ligand to obtain the polycaprolactone-poly (2-vinyl) ethylene glycol copolymer. The preparation method disclosed by the invention has the advantages of high efficiency and high selectivity, and the prepared copolymer is relatively high in vinyl content, controllable in molecular weight and narrow in molecular weight distribution.

The invention provides polyimide slurry for a flexible display substrate, a preparation method of the polyimide slurry and a preparation method of a polyimide film. The polyimide slurry comprises the following raw materials: diamine, dianhydride, an end-capping reagent, a solvent and an additive, the preparation method comprises the following steps: uniformly coating a SiOx inorganic layer substrate with slurry by adopting a slit coating device, carrying out HVCD and high-temperature imidization baking, standing in a high-humidity environment for 8 hours, and slowly stripping a PI film material by virtue of film stripping equipment, so as to obtain the light yellow polyimide film. Through specific formula and process development and optimization of the preparation process, the adhesive force between the polyimide film and the SiOx inorganic layer is remarkably improved, the problem that a traditional polyimide film is prone to falling off is effectively solved, electrical performance faults caused when the polyimide film is used in flexible display equipment are avoided, and the service life of the flexible display equipment is prolonged. The prepared polyimide film not only has good adhesive force, but also keeps excellent optical performance, mechanical performance and thermal performance, and is suitable for a high-performance flexible display technology.

The invention provides a semiconductor package, a method for manufacturing the semiconductor package, and a thermally conductive composition for the semiconductor package. The semiconductor package includes a substrate, a semiconductor element provided on the substrate, and a heat sink surrounding the periphery of the semiconductor element, and the semiconductor element and the heat sink are bonded by a thermally conductive material having a particle connection structure in which metal particles are sintered by heat treatment.

The CSHS reaction device comprises a liquid phase conveying system, a reaction system, a temperature control system and a sample collection system, the liquid phase conveying system consists of three same high-pressure conveying pumps for liquid chromatography, corresponding liquid phase pipelines and adapters; the reaction system consists of two sets of electric heating devices, corresponding liquid phase pipelines and adapters; the temperature control system controls the two sets of electric heating devices to enable the electric heating devices to be subjected to programmed temperature rise and stabilize the temperature to be 400 DEG C or above; and the sample collection system consists of a water cooling device, a filter and a back pressure valve. The CSHS reaction device is applied to preparation of a semiconductor H2S sensing material, is good in structural consistency and excellent in sensing performance, and can meet application requirements.

The invention belongs to the technical field of high polymer materials, and discloses a polyvinyl alcohol composition and a preparation method thereof, and a polyvinyl alcohol film and a preparation method thereof, the composition contains polyvinyl alcohol, a plasticizer, a melt flow modifier and a stabilizer; the content of the polyvinyl alcohol is 65 to 85 parts by weight, the content of the plasticizer is 12 to 30 parts by weight, the content of the melt flow modifier is 2.5 to 4 parts by weight, and the content of the stabilizer is 0.5 to 1 part by weight. The composition disclosed by the invention can meet the requirements of melt extrusion and continuous two-way stretching, the polyvinyl alcohol film can be rapidly prepared, and the film is excellent in performance.

The present invention belongs to the field of preparation and application of inorganic functional composite materials, and relates to a ZnO / ZnS composite material with zinc and oxygen double vacancies, and a preparation method and application thereof. The ZnO / ZnS composite material with zinc and oxygen double vacancies provided by the present invention has a hollow spherical structure, which has a higher specific surface area and can provide more surface active sites; at the same time, the zinc and oxygen double vacancy structure can shorten the band gap of the semiconductor, thereby improving the utilization rate of visible light. At the same time, the presence of vacancies can adjust the internal electronic structure of the material to improve the photocatalytic activity. Compared with single ZnO, the ZnO / ZnS composite material with zinc and oxygen double vacancies provided by the present invention shows excellent photocatalytic water decomposition hydrogen production performance.

A solvent removal apparatus, the apparatus comprising: a tank configured to contain an emulsion containing a first raw material of a continuous phase and a second raw material of a dispersed phase; a first fluid supply part configured to directly supply bubbles into the emulsion in the tank; and a second fluid supply part configured to directly supply bubbles into the emulsion in the tank, in which the second fluid supply part and the first fluid supply part are separated from each other such that bubbles passing through the first fluid supply part and the second fluid supply part in the emulsion form a rotational flow.

The invention belongs to the technical field of heterogeneous catalysis, and discloses a method for preparing a high-carbon oxygen-containing product through selective hydrogenation of carbon dioxide. A fixed bed continuous or batch reactor is filled with the supported catalyst, one or more than two of low-carbon unsaturated hydrocarbon and oxygen-containing derivatives of low-carbon hydrocarbon are combined with H2 to serve as a common hydrogen source, and the high-carbon oxygen-containing product is prepared. In conclusion, by using the process and the catalyst for efficiently preparing the high-carbon oxygen-containing product from the carbon dioxide, the high-carbon oxygen-containing product with single product distribution can be obtained under relatively mild conditions, and a new thought is provided for industrial production.

The invention relates to the technical field of surfactants, in particular to a modified starch-based surfactant as well as a preparation method and application thereof, and the preparation method comprises the following steps: step 1, mixing hydrophobic modified starch with a phosphate buffer solution to prepare 8-13wt% of a mixed solution; step 2, adding modified alpha-amylase into the mixed solution in the step 1, heating to 60-70 DEG C, oscillating for 20-30 minutes, deactivating enzyme after the reaction is finished, and concentrating to obtain a modified starch-based surfactant; the modified starch-based surface active agent is a cationic surface active agent; the mass of the modified alpha-amylase is 0.01-0.1% of the mass of the hydrophobic modified starch. The modified starch-based surfactant disclosed by the invention is suitable for the field of water treatment, not only can achieve relatively good emulsification stability, but also has a certain antibacterial effect, the preparation method of the modified starch-based surfactant is efficient, and the problems that the activity of a biological enzyme is low and the biological enzyme is unstable at a high temperature can be avoided.

The invention discloses an insecticide scavenger as well as a preparation method and application thereof, the scavenger MTSM is prepared by continuously modifying polyphenol tannic acid and locust cell membranes on mesoporous silicon, the preparation method is simple and efficient, and complex process conditions and procedures are not needed. The scavenging agent particles have a dual-mode scavenging function, and by means of pi-pi accumulation of the insecticide and TA and specific binding with acetylcholin esterase, nicotinic acetylcholine receptors or voltage-gated sodium channels on locust cell membranes, the removal effect on various insecticides such as organic phosphorus, pyrethroid and neonicotine is remarkably improved. Compared with particles which are not modified by locust cell membranes, the MTSM has the advantages that the non-specific removal of digestive enzymes in gastrointestinal tracts is obviously reduced, and the gastrointestinal functions of pollinating insects are favorably maintained. The scavenger disclosed by the invention is high in safety and convenient to prepare, can efficiently remove different insecticides in a broad-spectrum manner, has relatively large transformation potential in the aspect of detoxification of pollinating insects, and is expected to assist sustainable agricultural development.

This invention provides a steel material and a method for manufacturing the same, as well as a can and a method for manufacturing the same. The steel material of this invention has the following composition: by mass % C: 0.200% to 0.700%, Si: 0.05% to 1.00%, Mn: 20.0% to 40.0%, P: less than 0.030%, S: less than 0.0050%, Al: less than 5.00%, Cr: less than 7.0%, N: less than 0.0500%, O: less than 0.0050%, Ti: less than 0.005%, Nb: less than 0.005%, and contains one or more elements selected from Ca: less than 0.0100%, Mg: less than 0.0100%, and REM: less than 0.0200%, with the remainder consisting of iron and unavoidable impurities; the microstructure is such that the maximum crystal grain size at a position 1 mm below the surface of the steel is less than 200 μm.

The present invention addresses the problem of providing a method for producing a propionic acid derivative with excellent productivity. This problem is solved by a method for producing a compound represented by formula (1), said method comprising: a step A in which a compound represented by formula (2) and a compound represented by formula (3) M (R1) n (in the formula, M is a cation, and n is an integer corresponding to the valence of M) are reacted with each other; the compound shown in the formula (4): R6-X-H reacts with the compound shown in the formula (4): R6-X-H; and a step B in which a compound represented by formula (5): MFn is separated by filtration from the mixture obtained by the reaction. (In the formula, R1 is a halogen atom or the like, R2 and R3 are each independently a hydrogen atom, a halogen atom, an organic group or the like, X is an oxygen atom or a sulfur atom, R4 and R5 are each independently a hydrogen atom, a halogen atom, a hydrocarbon group which may have one or more substituents or the like, and R6 is a hydrocarbon group which may have one or more substituents. )

The invention discloses an attached auricular point treatment patch and a preparation method thereof, and particularly relates to the technical field of medical devices, the attached auricular point treatment patch comprises a core medicine layer, a protective isolation layer and a fixing layer, the core medicine layer is covered with the protective isolation layer, and the fixing layer is attached to the other side of the protective isolation layer; the core medicine layer is prepared from the following raw materials in parts by weight: 5 to 20 parts of radix angelicae sinensis, 5 to 15 parts of radix achyranthis bidentatae, 3 to 10 parts of rhizoma gastrodiae, 3 to 8 parts of rhizoma atractylodis macrocephalae, 1 to 5 parts of radix ginseng, 2 to 6 parts of rhizoma chuanxiong, 0.5 to 3 parts of nano folium ginkgo extract, 0.5 to 2 parts of radix astragali seu hedysari extract, a viscous matrix accounting for 5 to 20 percent of the total weight and a penetration enhancer accounting for 1 to 5 percent of the total weight; and the protective isolation layer is made of a medical grade polyethylene or polypropylene film with the thickness of 0.01-0.06 mm. The auricular point treatment patch can stably and continuously release medicine and effectively permeate into auricular points to achieve a good treatment effect, meanwhile, the solubility and bioavailability of the medicine are remarkably improved, the treatment effect is enhanced, and the comfort level and the fitting degree are good.

The invention discloses a biodegradable high water vapor barrier film and a preparation method thereof. The film comprises the following components in percentage by mass: 100wt% of biodegradable matrix resin and 1-20wt% of saturated fatty acid or monoglyceride thereof, the melting point of the saturated fatty acid or monoglyceride thereof is 50 DEG C or above, and the hydrophobic parameter calculation reference value is 5-15; the interior and the surface of the high water vapor barrier film comprise micro-nano flaky crystals formed by saturated fatty acid or monoglyceride of the saturated fatty acid. High-melting-point saturated fatty acid or monoglyceride of the saturated fatty acid directly acts on the degradable matrix resin and can be quickly crystallized on the surface and inside a resin film to form flaky crystals with micro-nano sizes, and the unique structure and morphology are combined with the hydrophobicity of the saturated fatty acid or monoglyceride of the saturated fatty acid matched with the matrix resin; meanwhile, adsorption and dissolution of water vapor on the surface and diffusion of the water vapor in the interior are reduced, and the water vapor barrier property of the film can be remarkably improved under the combined action of the two.

The invention discloses a polycarbonate polishing solution, a preparation method and a polishing performance testing method, and belongs to the technical field of polishing solutions, the polycarbonate polishing solution comprises the following components by mass: 58.5-62.5% of water, 22-26% of silica, 4-6% of a coupling agent, 3-5% of an oily lubricant, 3-5% of a surfactant, 2.5-3% of an organic alkali, and 0.5-1.0% of a dispersant; and the particle diameter of the silicon dioxide is 75-90 nm. By controlling the particle size of the silicon dioxide abrasive particles in the polishing solution, effective and precise polishing of high polymer materials such as polycarbonate can be realized; the oiliness agent, the organic base and the surface active agent are matched for use, so that the surface of the polycarbonate material can be prevented from being scratched when the polycarbonate material is polished; the synergistic effect of the coupling agent and the dispersing agent can ensure the stable storage of the polishing solution and avoid the agglomeration of the nano silicon dioxide particles in the polishing solution, so that the polishing solution can be used and recycled for a long time. The testing method provided by the invention can be used for intuitively evaluating the action effect of the polishing solution.

The invention relates to the field of synthesis of pyrazolone, and provides a method for synthesizing a pyrazolone structure by utilizing carbon dioxide aiming at the problem that an expensive transition metal catalyst and high-toxicity carbon monoxide are needed for synthesizing pyrazolone by utilizing carbonylation reaction, and the reaction formula is as follows: # imgabs0 # reaction conditions are as follows: in the presence of carbon dioxide, in an organic solvent and under the action of alkali, the reaction is carried out for 1-3 hours, so that the pyrazolone structure is synthesized by utilizing carbon dioxide. And reacting the compound II with carbon dioxide to obtain the pyrazolone structure. According to the method, the pyrazolone structure is synthesized in a green and efficient manner by utilizing carbon dioxide.

A method for one-step preparation of methylamine by hydrogenation amination of carbon dioxide, belonging to the field of catalysis. In a fixed-bed reactor, carbon dioxide, hydrogen, and ammonia are reacted. The catalyst comprises a microporous or mesoporous silica support, and the active component includes indium, zirconium, and at least one metal promoter selected from nickel, copper, palladium, rhodium, and platinum; the In 3d... 5 / 2 The binding energy is 444.0~444.7 eV, which is more than 0.2 eV lower than that of pure indium oxide; the single-pass conversion rate of carbon dioxide is not less than 50%, the total selectivity of methylamine is not less than 80%, and the selectivity of the byproduct carbon monoxide is not higher than 20%. This invention constructs a unique In-Zr-M active center, with In, Zr, and M uniformly co-distributed at the nanoscale. By adjusting the NH3 / CO2 ratio, the ratio of dimethylamine to trimethylamine can be controlled. The catalyst of this invention exhibits excellent performance and good stability, and has broad application prospects in the fields of carbon dioxide resource utilization and green synthesis of methylamine.

Examples relate to thin films, transparent laminates, applications as cover films, and multilayer electronic devices incorporating the thin film, which possess excellent optical properties such as refractive index, haze, and yellowness, as well as excellent mechanical properties. The thin film includes an elastic layer with a refractive index of 1.48 to 1.58 and a low-temperature damage index (the difference between tensile modulus and tensile strength at a specific temperature), wherein the low-temperature damage index of the elastic layer at -40°C is below 1300 MPa.

The invention discloses an Ag monatomic modified In2O3 single crystal film prepared based on pulse voltage discharge, a method thereof and a gas sensitive sensor, and the method comprises the following steps: 1) placing a substrate in a vacuum cavity of magnetron sputtering equipment, taking an indium oxide target as an In source, and growing on the substrate through a magnetron sputtering technology to obtain an indium oxide single crystal film; the substrate is yttrium oxide stabilized zirconia (YSZ); (2) placing the indium oxide single crystal thin film obtained in the step (1) on a vacuum chamber sample table which is internally provided with a pulse voltage discharge electrode and an Ag target material, evaporating Ag particles based on a pulse voltage discharge process, and depositing the Ag particles on the surface of the indium oxide single crystal thin film material to form dispersed clusters; and annealing to obtain the Ag single atom modified In2O3 single crystal thin film. The synthesis of a sensitive material with a high atom utilization rate and a stable structure is realized, and an advanced NO2 gas sensing device with high sensitivity and high selectivity is obtained.

The invention provides pyrroloquinoxaline fused azasugar derivatives as well as a synthesis method and application thereof. The structural formula of the pyrroloquinoxaline fused azasugar derivative is as shown in formulas (I)-(V), and the preparation method is efficient, simple and convenient and easy for large-scale production. Tests prove that the compound has good anti-tumor cell proliferation activity, can be applied to preparation of anti-tumor medicine preparations, and can provide more medicine choices for clinical treatment of tumor-related diseases.

The invention relates to the technical field of inorganic adhesive production, and particularly discloses a phosphate adhesive and a preparation method thereof. The phosphate adhesive is prepared by using the low-valence metal oxide and / or the mixed-valence metal oxide as the curing accelerator, and the low-valence metal oxide and / or the mixed-valence metal oxide are / is not directly neutralized with phosphoric acid due to weak alkalinity and have relatively high affinity to positive and negative electric centers; the adhesive has the characteristics that phosphoric acid-copper oxide / ferric oxide is easily catalyzed to generate polymerization reaction, so that the initial reaction temperature is relatively low, and the adhesive prepared by the invention has higher curing strength and less curing accelerator dosage under the condition of the same working life as an adhesive prepared by the prior art; the contradiction between enough sizing time and higher curing strength in the prior art is solved, the preparation method is simple and efficient, industrial production is easy to realize, and the adhesive is wider and more flexible in application.

The invention relates to the technical field of acrylic emulsions, and discloses an acrylic barrier emulsion capable of reducing the surface tension of paper-based materials and a preparation method thereof. The emulsion comprises isooctyl acrylate, styrene, methyl methacrylate, unsaturated organic acid, hydroxyethyl methacrylate, tert-butyl vinyl carbonate, crosslinking monomers, auxiliary agents, reactive emulsifiers, initiators, and deionized water. The film formation of the emulsion is facilitated by reasonable compounding of rigid and flexible monomers. The bonding of carboxyl and hydroxyl functional groups with paper-based fibers and the addition of crosslinking monomers improve the binding force between the coating and the paper base. The reactive emulsifier is added to prevent the reactive emulsifier from being free, thereby improving the waterproof and oil-proof performance of the polymer. The auxiliary agent is added at the initial stage of the reaction to fill the gap of tert-butyl vinyl carbonate, and tert-butyl vinyl carbonate is added in the form of post-addition, so that the papillary structure formed by tert-butyl vinyl carbonate located at the base layer of the polymer film can exert its excellent waterproof and oil-proof barrier performance.

The invention provides a rapid preparation method of a multi-size alpha-synuclein aggregate, and solves the problems of tedious steps and high cost of an existing preparation method of different-size alpha-synuclein aggregates. The method comprises the following steps: 1) dissolving a separated and purified alpha-synuclein monomer in a physiological buffer solution, and uniformly mixing to obtain a monomer protein solution; (2) putting the monomer protein solution into a centrifugal tube, shaking and incubating under a certain condition, and respectively sampling at different time points in the incubation process; (3) respectively adding samples into an ultrafiltration centrifugal tube, and carrying out centrifugal separation to remove small-size proteins; and 4) adding a physiological buffer solution into the ultrafilter of each ultrafiltration centrifuge tube, inversely placing each ultrafilter in a centrifuge tube matched with the ultrafilter, and centrifugally separating and collecting the protein aggregate on the inner membrane of each ultrafilter to obtain the protein aggregate with different morphological structures.