77results about How to "Achieve preparation" patented technology

The application relates to a method for preparing a deformable reinforcing metal matrix composite material by a pressure infiltration technology, and relates to a method for preparing a metal matrix composite material. In order to solve the problems of poor plasticity of the metal matrix composite material and difficulty in preparing a deformable reinforcing aluminum matrix composite material by a self-exhaustion pressure infiltration technology, the application mixes reinforcing body powder with polysilazane, and then sintering, the polysilazane is cracked at high temperature and a ceramic skeleton is generated, the structural strength of the preform in a high-temperature state is improved, and the success rate of the self-exhaustion pressure infiltration process for preparing the deformable reinforcing metal matrix composite material is effectively improved. The application realizes the function of preparing a heterogeneous aluminum alloy by the pressure infiltration technology, and has better strength-plasticity matching compared with a homogeneous alloy with the same composition.

The application discloses a method for co-production of aviation kerosene precursor and carbon nanotubes from waste oil, which comprises the following steps: catalytic pyrolysis: under an inert atmosphere, oil compounds are subjected to catalytic pyrolysis under the action of a catalyst, and products are condensed to obtain non-condensable gas and liquid aviation kerosene precursor; non-condensable gas purification: CO2 and moisture in the non-condensable gas are removed to obtain purified gas; chemical vapor deposition: under the action of a foamed metal catalyst, the purified gas is subjected to chemical vapor deposition to obtain carbon nanotubes. The application realizes preparation of aviation kerosene precursor with hydrocarbon selectivity over 80% through catalytic pyrolysis, and has strong practicability in fuel deoxygenation; through reforming and upgrading of the non-condensable gas, preparation of carbon nanotubes is realized, and the added value of pyrolysis products is greatly improved. The application has a short path and low pollution degree, realizes resource utilization of waste oil, achieves the purpose of environmental protection, and has application value in the fields of energy and environmental protection.

The invention belongs to the technical field of powder metallurgy, and particularly relates to a preparation method of a titanium alloy part with a precise inner runner, which comprises the following steps: preparing a required inner runner structure model by adopting a 3D printing technology, obtaining a titanium alloy blank with an inner runner structure through positioning pressing, degreasing and sintering, and finally preparing the titanium alloy part with the precise inner runner according to the size requirement of a finished product. And the titanium alloy part with the fine inner runner can be obtained only by performing finished product processing on the appearance of the runner plate. According to the method, machining and subsequent welding procedures of the titanium alloy inner runner are avoided, the preparation period is greatly shortened, meanwhile, the problems of titanium alloy plate deformation caused by the inner runner machining process in a conventional method and welding defects, low welding yield and the like in the welding process are avoided, the yield of the runner plate can be effectively increased, and the production cost is reduced. And the production cost is greatly reduced.

The invention provides a position measurement device, a measurement method, a workpiece stage position compensation method, an exposure method and exposure equipment, and the measurement device comprises a first reflector, a second reflector, a first interferometer reference axis, a second interferometer reference axis and a data processing module. The first reflecting mirror and the second reflecting mirror are arranged at the bottom of the objective lens; the first interferometer reference axis is configured to measure a first horizontal displacement of the objective lens; a second interferometer reference axis configured to measure a second horizontal displacement of the objective lens; the data processing module is configured to determine the deflection angle of the objective lens according to the first horizontal displacement and the second horizontal displacement of the objective lens and the height difference between the first interferometer reference axis and the second interferometer reference axis. According to the invention, the deflection angle of the objective lens can be measured, so that errors caused by deflection of the objective lens can be compensated to the position of the workpiece table, and the influence of the position offset of the objective lens on the overlay precision can be reduced.

This invention relates to the field of new energy and discloses a highly selective photocatalytic method for producing acetone from methane. The method includes: placing a transparent substrate coated with a photocatalyst in a photocatalytic reactor, adding liquid water, introducing methane gas to purge air, sealing the photocatalytic reactor, and conducting a gas-solid two-phase photocatalytic reaction under light irradiation and heating at 50-100°C to generate a liquid oxygen-containing organic compound, primarily acetone. The photocatalyst is BiVO4, ZnO, or a modified photocatalyst based on morphology control, surface modification, semiconductor composite, or elemental doping of BiVO4 or ZnO. This invention uses methane and water as raw materials, reacting with a photocatalyst in a gas-solid two-phase reaction to produce a liquid oxygen-containing organic compound, primarily acetone, with high acetone yield and selectivity. This invention has advantages such as low requirements for the reaction environment, simple and environmentally friendly process, and low cost.

The application discloses a collagen microsphere reaction device and an application method thereof, and is based on the cooperation of structural members provided with through hole arrays to form a series type focusing through hole array, solves the problems of high integration difficulty and complex operation of pipeline microfluidic technology; the series type focusing through hole array can realize instant mixing and emulsification of a collagen solution and a crosslinking agent into a ball, solves the problem of solution flowability change caused by solution solidification in advance due to pre-mixing of the crosslinking agent; in addition, multiple containers adopt homologous driving force, and monodisperse collagen microspheres are synchronously generated in the focusing through hole array, so that standardized batch production of the collagen microspheres can be realized, the difficulty of large difference between batches in the traditional method is solved, the collagen microsphere preparation can be conveniently and efficiently realized, and the application can be widely applied to the technical field of microsphere synthesis.

A novel PRP manufacturing set comprises a blood drawing tube, a PRP sampling tube and a common syringe, the outer wall of the blood drawing tube is fixedly connected with a 40ml scale line, the outer wall of the PRP sampling tube is fixedly connected with a 20ml scale line, and the front end of the blood drawing tube is provided with a butt joint tube structure. According to the novel PRP manufacturing set, the first piston head at the front end can be pushed through the detachable push rod to be pulled and slide in the blood drawing tube, the first piston head can drive the interior of the blood drawing tube to achieve blood drawing, blood feeding and PRP manufacturing through being communicated with the PRP sampling tube through negative pressure, the PRP sampling tube is designed to be of a short and thick structure, the maximum capacity is 20 ml, the short and thick design is adopted, the head can be clamped, and the PRP sampling tube is convenient to use. According to the novel PRP manufacturing set, blood drawing operation does not need to be completed, blood can be quantitatively conveyed into the PRP sampling tube through a long injector structure and a short injector structure, the PRP manufacturing process can be more accurately and reasonably achieved, and the using effect of the novel PRP manufacturing set is improved.

The application provides a polarization volume holographic grating, a preparation method of the polarization volume holographic grating and an exposure system, and the polarization volume holographic grating comprises a substrate layer, a two-dimensional orientation layer and a liquid crystal layer; the two-dimensional orientation layer is arranged on the surface of the substrate layer, the orientation direction of the two-dimensional orientation layer periodically changes in a first preset direction and periodically changes in a second preset direction perpendicular to the first preset direction, so that the two-dimensional orientation layer forms first and second equal phase lines with an included angle greater than zero; the liquid crystal layer is arranged on the surface of the two-dimensional orientation layer away from the substrate layer, the arrangement direction of the liquid crystal molecules in the liquid crystal layer corresponds to the orientation direction of the two-dimensional orientation layer, so that the liquid crystal layer forms a first equal phase surface corresponding to the first equal phase line and a second equal phase surface corresponding to the second equal phase line. The application orients the liquid crystal layer through the two-dimensional orientation layer, so that the polarization volume holographic grating has the diffraction characteristics of a two-dimensional grating, and the preparation of a single-layer two-dimensional polarization volume holographic grating is realized.

This invention relates to a mesoporous platinum@platinum-nickel core-shell framework nanowire and its preparation method, comprising the following steps: (1) uniformly mixing platinum precursor, nickel precursor, structure directing agent, and reducing agent with a first solvent, and performing a hydrothermal reaction to obtain Pt@Pt-Ni core-shell nanowires; (2) uniformly mixing the Pt@Pt-Ni core-shell nanowires with a second solvent and acetic acid, and performing an etching reaction to obtain etched mesoporous platinum@platinum-nickel core-shell framework nanowires. This invention employs a hydrothermal method, which is simple, reproducible, and allows for batch production with safety. Compared with traditional commercial platinum-carbon catalysts, the catalytic activity is greatly improved, the stability is greatly enhanced, and the production cost is reduced.

This invention discloses a method for preparing high-temperature resistant polyimide foam material, comprising: preparing a foamable precursor powder using aromatic dianhydride and diamine; performing bilayer extrusion and foaming molding using two single-screw extruders, wherein one extruder extrudes and foams the foamable precursor powder, and the other extrudes fiber-reinforced thermoplastic resin; the two are compounded at a co-extrusion die, and shaped by a shaping die to obtain a polyimide foam composite material with a fiber-reinforced resin layer on the surface; cutting and collecting polyimide foam strips or foam particles of equal length, filling them into a die, and then hot-pressing to obtain the polyimide foam composite material. This invention significantly improves the operability of polyimide foam preparation and simplifies subsequent molding processes. This invention also provides a high-temperature resistant polyimide foam material obtained by the above preparation method, which can simultaneously provide high compressive strength, high modulus, and low density, and is easy to scale up for production.

The application discloses a molybdenum nitride film and a preparation method and a vacuum interconnection system thereof, and the preparation method comprises the following steps: providing a substrate; and growing a molybdenum nitride film on the substrate through an ultrahigh vacuum chemical vapor deposition process, wherein the crystal phase of the molybdenum nitride film is delta-MoN, and the vacuum degree in the growth process of the molybdenum nitride film is not higher than 3*10 ‑10 Mbar, and the substrate temperature is 850 DEG C to 1000 DEG C. The ultrahigh vacuum chemical vapor deposition process is adopted, and the growth parameters in the growth process of the molybdenum nitride film are controlled, so that the preparation of the molybdenum nitride film with a pure delta-MoN crystal phase is realized.

The invention provides a biodegradable graphene / PBAT composite packaging bag and a preparation method thereof. The method comprises the following steps: S1, heating and calcining rice husks in an air furnace to obtain rice husk ash; s2, mixing the rice hull ash with potassium hydroxide, and reacting at 700-900 DEG C; s3, adding a product obtained in the step S2 into lime milk for full reaction, precipitating calcium carbonate among graphene, then filtering, cleaning to be neutral, and drying to obtain a calcium carbonate / graphene composite material; s4, blending the calcium carbonate / graphene composite material with a PBAT master batch, performing melt extrusion by using a double-screw extruder, performing air cooling, and performing pelletizing for standby application to obtain a calcium carbonate / graphene / PBAT composite master batch; and S5, preparing the full-biodegradable graphene-based PBAT film from the calcium carbonate / graphene / PBAT composite master batch by adopting a film blowing method, and then preparing the packaging bag.

The application discloses a kind of T profile intersection panel double-angle transition operation methods, and the method specifically includes the following steps: S1, web in T profile is respectively welded and fixed with bulkhead and outer plate, and the circular radius R of arc angle transition is measured;S2, the panel of T profile on bulkhead is installed on the web on bulkhead, and the panel width B is measured;S3, the panel of T profile on outer plate is installed on the web on outer plate, and the angle A of panel and web on outer plate is measured;S4, make dome long circle bottom platform device, according to the circular radius R cutting dome long circle bottom platform, obtain the transition panel of arc angle transition;S5, the transition panel is installed on the web;S6, the transition panel is cut to panel excess after installation is completed, and the installation of bulkhead and outer plate transition panel is completed.The application is cut by making dome long circle bottom platform to realize the manufacture and installation of transition panel, improve the installation efficiency of transition panel and construction quality.

The invention relates to the technical field of metallurgical materials, and particularly discloses a method for refining a functional boron stainless steel sheet structure through large deformation machining. Comprising the following steps that S1, smelting is conducted, specifically, a steel ingot is prepared through a vacuum induction smelting and electroslag remelting duplex technology; s2, sheath forging: carrying out surface treatment on the steel ingot to obtain a blank, filling the blank into a steel sheath for packaging to form a blank with a sheath, and carrying out hot forging on the blank with the sheath to obtain a forged plate with the sheath; s3, sheath rolling: performing multi-pass hot rolling on the forged plate to prepare a hot-rolled thin plate with a sheath; s4, solution treatment: carrying out solution treatment on the hot-rolled sheet to obtain a solution-treated sheet; and S5, surface treatment is conducted, specifically, after a steel ladle sleeve of the thin plate subjected to solution treatment is removed, surface treatment is conducted, and the functional boron stainless steel thin plate with the needed specification and size is obtained. By means of the method, the boron stainless steel sheet which is excellent in mechanical property, uniform in thermal neutron absorption and suitable for being used as a structure / shielding integrated material can be prepared.

The application discloses a bypass discharge device pressing method, which comprises the following steps: assembling a steam inlet flange, a first-stage cylinder and a first-stage pressing blanking plate, selecting a pressure test pressure according to a first-stage bypass discharge design pressure, processing a reserved first-stage cylinder length to a first-stage cylinder design size after completing the pressure test, assembling the first-stage cylinder with a first-stage cone and a first-stage blanking plate, and completing the pressing and manufacturing of the first-stage bypass discharge; assembling the first-stage bypass discharge with a second-stage end plate, a second-stage cylinder and a second-stage pressing blanking plate, selecting a pressure test pressure according to a second-stage bypass discharge design pressure, processing a reserved second-stage cylinder length to a second-stage cylinder design size after completing the pressure test, assembling the second-stage cylinder with a second-stage cone and a second-stage blanking plate, and completing the pressing and manufacturing of the second-stage bypass discharge; and pressing and assembling the bypass discharge device step by step according to the pressing and manufacturing method of the second-stage bypass discharge to the last stage. The application realizes the lightweight and reliability design and manufacturing of the bypass discharge device.

The utility model provides a louvered wheel manufacturing device belongs to mechanical technical field. A louvered wheel manufacturing device, include: base, fixed disc is fixedly connected on the base, is provided with the placement groove on the fixed disc, is provided with recessed part for the base body of louvered wheel of placement groove middle, recessed part middle bottom is provided with the jack -in hole, positioning ring, positioning ring can be detachably installed on the fixed disc, is provided with the positioning card slot on the inner ring of positioning ring and is arranged in the circle, and the position of louvered wheel's abrasive disc is used for positioning card slot, tablet assembly, tablet assembly can be detachably installed in the jack -in hole position, and tablet assembly is used for extruding the abrasive disc and is inclined, extrusion assembly, extrusion assembly is installed on the base, and extrusion assembly is located in the fixed disc right above, and extrusion assembly is used for extruding the abrasive disc and is inclined to the final inclined position.

The application discloses a preparation method of nanosheet TS-1 molecular sieve and application thereof, relates to the technical field of catalysts, and synthesizes the TS-1 molecular sieve through a double quaternary ammonium salt structure directing agent containing a benzene ring; the obtained TS-1 molecular sieve has rich surface active sites and contains almost no impurities such as non-framework titanium and anatase TiO2; meanwhile, the nanosheet morphology significantly improves the diffusion and mass transfer performance of macromolecular reactants in a catalytic process, effectively enhances the accessibility of active sites; in a cyclohexene epoxidation reaction, the molecular sieve exhibits excellent catalytic performance and shows good application prospect; and the problems of significant channel diffusion limitation and low accessibility of active sites of the TS-1 molecular sieve in a catalytic process are solved.

This invention discloses a wasp venom peptide-M nanocomposite, its preparation method, and its applications, belonging to the field of medicinal chemistry. Using indocyanine green as a morphology mediator, this invention prepares an ultra-small particle size dendritic tetrasulfide by reacting it with triethylamine, hexadecyltrimethylammonium bromide, tetraethyl orthosilicate, and bis[3-(triethoxysilyl)propyl]tetrasulfide in water. Wasp venom peptide-M is then loaded onto this nanocomposite to obtain the wasp venom peptide-M nanocomposite. In vitro experiments have confirmed that this composite can significantly kill 4T1 breast cancer cells. Furthermore, thanks to its ultra-small particle size, it also exhibits good targeting and enrichment, significant anti-tumor efficacy, and excellent safety in a breast cancer brain metastasis model, providing a novel and efficient nanomedicine delivery system for brain tumor treatment and the development of related therapeutic drugs.

The invention discloses a circuit board and a manufacturing method thereof, the circuit board comprises a first circuit layer, an insulating layer, a second circuit layer, a first conduction part and a conductive part, and the first circuit layer comprises a connecting pad; the insulating layer is located on the surface of the first circuit layer; the second circuit layer is located on the surface of the insulating layer, and a first through hole penetrates through the second circuit layer, the insulating layer and the connecting pad; the first conduction part penetrates through the first through hole, the first conduction part comprises a first part and a second part which are connected with each other, the first part is located in the first through hole, the second part protrudes out of the surface of the connecting pad, and the first conduction part is formed in an electroplating mode; the conductive portion covers the second portion and extends to a portion of the surface of the connection pad. According to the circuit board and the manufacturing method thereof, the second part protrudes out of the surface of the connecting pad, so that the connection reliability of the conduction part and the second part can be improved, the connection stability of an electronic element on the circuit board is further improved, and meanwhile, the size of the connecting pad can be effectively reduced.

The utility model discloses a conical roll paper packing machine which comprises a machine table, and a roll-over stand and a roll paper jig are installed on the machine table. The roll-over stand is in running fit with the machine table; a receding groove is formed in the upper surface of the paper winding jig, and a bottom pressing roller is arranged below the receding groove. The winding shaft is installed on the overturning frame and can rotate around the axis of the winding shaft, a winding drum is installed on the winding shaft, the winding drum is in transmission fit with the winding shaft, and the extending direction of the winding drum faces the paper winding jig; the winding drum and the bottom pressing roller are conical, and the bottoms of the winding drum and the bottom pressing roller face the overturning frame; the roll-over stand is provided with a first position and a second position, at the first position, the winding drum abuts against the bottom pressing roller, and at the second position, the winding drum is separated from the bottom pressing roller. Conical cigarette roll paper can be rolled, and tobacco can be conveniently poured into the cigarette roll paper.

The invention relates to the technical field of traditional Chinese medicine active component extraction and raw material medicine purification, in particular to a staged extraction and purification method of traditional Chinese medicine active component raw material medicine. Wherein the raw material medicine of the active component of the traditional Chinese medicinal materials is a matrine raw material medicine, and the preparation method comprises the following steps: S1, carrying out contact extraction on the matrine-containing traditional Chinese medicinal materials and an acidic ethanol aqueous solution to obtain a total alkaloid extracting solution; s2, obtaining a first-time segmented extraction solution; s3, obtaining a desalted enrichment solution; s4, obtaining a matrine fumarate crystal; s5, obtaining a matrine organic phase; and S6, obtaining the matrine bulk drug. By constructing a series purification technical scheme of ethanol-phosphate aqueous two-phase segmented enrichment, nanofiltration dialysis replacement desalination, fumaric acid selective salification crystallization, free alkali release extraction and displacement anti-solvent crystallization, segmented selective enrichment and purification of matrine in the total alkaloid extracting solution are realized.

A powder metallurgy forming die for a spiral gear belongs to the field of die manufacturing and comprises a forming middle die, an upper punch combination assembly, a lower punch combination assembly and a core rod combination assembly, and a cavity block for forming an outer contour structure of the spiral gear is nested in an inner cavity of the forming middle die; the upper punch assembly comprises an upper punch base, an upper punch press cover, an upper punch rotation auxiliary assembly and an upper punch arranged in the upper punch rotation auxiliary assembly which are sequentially connected from top to bottom; the lower punch combination assembly comprises a lower punch base, a lower punch press cover, a lower punch rotation auxiliary combination body and a lower punch arranged in the lower punch rotation auxiliary combination body which are sequentially connected from bottom to top. And the core rod combination assembly comprises a core rod base, a core rod gland, a core rod combination body and a core rod arranged in the core rod combination body which are sequentially connected from bottom to top. By reasonably designing the structures of all the parts, large-batch and high-precision manufacturing of the spiral gear is achieved through the general powder metallurgy technology, and the labor cost and the mold cost are reduced.

This disclosure provides a cooling device for a battery assembly, the cooling device comprising: a cooling plate extending longitudinally along a first direction, the cooling plate including a cooling outer tube for conducting coolant; wherein the cooling outer tube is formed by bending and closing a single sheet material. Furthermore, this disclosure also provides a battery assembly and a vehicle.

This invention discloses a gradient-pore structure for foamed ceramics based on municipal solid waste incineration slag and its two-stage firing method, belonging to the technical field of solid waste utilization and building materials. The material comprises 50-70 parts of municipal solid waste incineration slag, 0-15 parts of kaolin, 20-40 parts of tailings slag, 3-15 parts of feldspar, 0-5 parts of talc, 0.2-0.35 parts of a gradient foaming agent, and 1-3 parts of additives, and is mainly prepared through a two-stage high-temperature firing process. This invention reduces the sintering temperature and energy cost of the foamed ceramics, achieving the harmlessness and resource utilization of the slag. The two-stage firing process, combined with a gradient foaming agent, forms a gradient-pore structure with pore sizes ranging from small to large and pore walls gradually becoming denser with increasing temperature. This solves the problems of low closed-cell rate and uneven pore size distribution caused by the difficulty in controlling the valence state transformation of iron in the slag and the inability of a single foaming agent to meet the foaming requirements of the slag in different temperature ranges, thus realizing the preparation of high-performance slag-based foamed ceramics.

The application provides a continuous preparation method of artificial muscle fiber and a device used in the method. The device comprises a wire releasing unit for independently releasing original fibers, a guiding unit for gathering the original fibers into ply fibers, a twisting unit for twisting the ply fibers into twisted fibers, and a wire collecting unit for collecting the twisted fibers; and further comprises a tension monitoring unit for detecting a tension value, a merging point monitoring unit for detecting a merging point position of the fibers, and a master control unit for adjusting wire releasing parameters to maintain the tension value within a preset tension interval, and for adjusting a matching relationship between the rotating speed of the twisting unit and the wire collecting unit to maintain the merging point position within a preset area. The application provides a device suitable for continuously twisting a plurality of fibers under closed-loop tension control, which can realize continuous high-twist plying of the plurality of fibers, further insert twisted fibers with high twist to form a plurality of yarn artificial muscle fibers with a spiral structure, so as to realize preparation of an artificial muscle fiber bundle and increase driving force.

The application discloses a preparation method of a Schottky diode and the device, wherein the method comprises the following steps: growing a semiconductor structure layer on a substrate; the semiconductor structure layer comprises a high-resistance layer, a P-type buried layer, a channel layer and a barrier layer which are sequentially grown; etching the semiconductor structure layer to form a first growth step and a second growth step which reach the P-type buried layer at two ends of the semiconductor structure layer respectively; injecting blocking ions into the P-type buried layer at the first growth step to form an ion injection area, the ion injection area penetrates through the P-type buried layer and extends to outside the first growth step; growing a negative electrode and a positive electrode on the first growth step and the second growth step respectively. The method disclosed by the application can prepare the Schottky diode with the higher reverse withstand voltage, the lower leakage current, the simple structure and the higher crystallization quality of each structure layer in the Schottky diode.

The application discloses an antibacterial medical catheter gas-liquid co-assisted forming die and a method thereof. The die comprises a connecting pipe, a flow channel changing pipe, a machine head body, an extrusion outlet die and an outer die in sequence, and an extrusion channel is formed in the above structure units and is in communication with each other. Heating equipment and temperature sensing equipment are further installed. A melt flow dividing cone, a flow guide core rod body and a shaping rod body are sequentially assembled in the extrusion channel from left to right. An auxiliary gas mixing chamber and an inner auxiliary gas flow channel are formed between the melt flow dividing cone and the flow guide core rod body. The melt flow dividing cone is fixed by an inner auxiliary gas inlet bolt. A through gas inlet channel is arranged in the inner auxiliary gas inlet bolt. An inner auxiliary gas flow channel is arranged in the melt flow dividing cone. A powder metallurgy porous ring is arranged in the extrusion outlet die, and an outer liquid auxiliary liquid inlet bolt is inserted into the hollow. The gas-liquid co-assisted system is introduced to reduce the extrusion viscous resistance of the medical catheter, and the medical catheter is endowed with antibacterial properties and other functions, so that the die problem of high-quality extruded functional medical microcatheters is solved.

The invention discloses a preparation method of a chiral hydrogenated carbazole skeleton compound, an asymmetric Diels-Alder reaction is catalyzed by a catalyst, an asymmetric catalytic system is a secondary amine-acid catalytic system, a dienophile is nitrogen-substituted-2 or 3-alkenyl indole, and a dienophile is beta-substituted-alpha, beta-unsaturated aldehyde, alpha-alkyl-alpha, beta-unsaturated aldehyde or alpha-alkyl-alpha, beta-unsaturated aldehyde. The invention also relates to a method for preparing the compound. The asymmetric Diels-Alder reaction of low-activity 3-alkenyl indole and 2-alkenyl indole with wide alpha, beta-unsaturated aldehyde is realized for the first time, so that a chiral hydrogenated carbazole skeleton containing a continuous chiral center and a full-carbon quaternary carbon chiral center and a polycyclic hydrogenated carbazole skeleton can be rapidly constructed; the method has the advantages of high yield, high stereoselectivity, mild conditions and the like, and is helpful for promoting research of synthetic methodology and pharmaceutical chemistry in related fields.

The application discloses a Pincer ligand rare earth metal catalyst and a preparation method thereof, and application of the Pincer ligand rare earth metal catalyst in preparation of primary amine borane compounds and secondary amine compounds. The Pincer ligand rare earth metal catalyst can be bonded with a nitrogen atom in a borane ammonia complex, thereby activating a B-H bond, so that the preparation of the primary amine borane compounds and the secondary amine compounds can be completed by using the borane ammonia complex. Compared with pinacol borane (HBpin), the borane ammonia complex (H3NBH3) has the characteristics of high stability, small toxicity and convenient storage as a boron source, and can reduce energy consumption and be environment-friendly in the reaction. In addition, the Pincer ligand rare earth metal catalyst has the advantages of simple source, small dosage and low preparation difficulty.