47 results about "Magnetic stirrer" patented technology

The application discloses a preparation method of a low-TCR low-cost ceramic heating tube, and comprises the following steps: (1) preparing an organic carrier: 60 parts by weight of terpineol, 20 parts by weight of ethyl cellulose, 10 parts by weight of a binder and 10 parts by weight of diethylene glycol acetate are placed into a magnetic stirrer and uniformly dissolved and mixed; (2) weighing metal powder: Mo: 50-70 parts by weight; Re: 20-30 parts by weight; Mn: 0-5 parts by weight; Cr: 10-15 parts by weight; by adopting Mo, Re, Mn and Cr in a specific ratio as the metal powder, the traditional mode of adopting metal ruthenium powder or a mixture of metal ruthenium powder and other common metal powder is replaced, the prices of Mo, Re, Mn and Cr are low, so that the preparation cost of the ceramic heating tube is effectively reduced, the purpose of low TCR is achieved, and the scale production is facilitated; meanwhile, the ceramic heating tube prepared by adopting the application has higher overall bending strength, and can better meet the use requirement.

The application discloses a vacuum degassing method and device, comprising: vacuumizing the degassing chamber by a vacuum pump; making the liquid to be degassed flow into the degassing chamber and detecting the viscosity of the liquid to be degassed; setting the rotating speed of the magnetic stirrer and the frequency of the ultrasonic generator according to the viscosity, controlling the magnetic stirrer and the ultrasonic generator to carry out collaborative degassing, the magnetic stirrer is installed in the degassing chamber and cooperates with the magnetic stirrer outside the degassing chamber, the ultrasonic generator is installed outside the degassing chamber, when the magnetic stirrer rotates, the liquid to be degassed uniformly passes through the ultrasonic wave generated by the ultrasonic generator; when the preset air extraction condition is met, the magnetic stirrer and the ultrasonic generator are closed, after being rested for a preset time, the degassing chamber is vacuumized, and then the magnetic stirrer and the ultrasonic generator are controlled to carry out collaborative degassing until the preset completion condition is reached, and the liquid after degassing is obtained. Different viscosity liquids can be efficiently vacuum degassed.

Present invention relates to a method for producing green fluorescent paint for use as a lighting for energy-efficient highway lane and park markings, characterized as comprising following production steps; adding 9,10-dibromoanthracene, CuI, Pd catalyst, diisopropylamine and toluene in a reaction flask under nitrogen atmosphere and stirring them on a magnetic stirrer, adding tetraphenylsilanacetylenyl to the mixture and performing reflux distillation by increasing the reaction temperature, after 24 hours bringing the temperature to room temperature, obtaining pure product from the mixture brought to room temperature using column chromatography, taking 0-1% by mass of the product and mixing it in resin and an aromatic solvent for 6-24 hours.

The utility model relates to a dilution tank for vitamin B12 injection production, which comprises a tank body, a sealing cover installed on the top of the tank body, a liquid inlet arranged on one side of the top of the tank body, a water inlet arranged on the other side of the top of the tank body, a liquid outlet arranged at the bottom of the tank body, a first filter element installed in the liquid inlet and extending into the tank body, a second filter element installed in the liquid outlet, an L-shaped liquid discharge pipe installed at the bottom of the liquid outlet, a corrugated flexible pipe arranged on the vertical section of the liquid discharge pipe, the second filter element arranged in the corrugated flexible pipe, a hanger connected with the liquid discharge pipe arranged at the bottom of the tank body, a safety valve and an ultrasonic liquid level sensor installed on the top of the sealing cover, a temperature sensor arranged on the inner wall of the tank body, a pressure sensor arranged on the bottom of the inner wall, a plurality of sampling valves arranged on one side of the tank body from top to bottom, and magnetic stirrers arranged on both sides of the bottom of the tank body and symmetrical to the liquid outlet. The utility model adds a filtering function, thereby improving the purity and production safety of the liquid medicine.

The application relates to the field of photocatalysis, and discloses a sulfur-doped carbon nitride photocatalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) mixing DL-methionine, melamine and water in proportion, and then uniformly mixing the mixture by using a magnetic stirrer; (2) performing hydrothermal reaction on the mixture, and then performing centrifugal drying to obtain an intermediate product; and (3) performing calcination on the intermediate product by covering the intermediate product with mixed chloride. The weight ratio of the amount of use of the melamine to the amount of use of the DL-methionine is 1: (0.01-0.3). The sulfur-doped carbon nitride photocatalyst prepared by the application has greatly improved g-C3N4 photocatalytic activity through the synergistic effect of crystallinity optimization and sulfur doping, the obtained carbon-crystalline carbon nitride photocatalyst has excellent photocatalytic activity, and can be widely applied to various application scenarios of photocatalysis, and can be especially applied to photocatalytic hydrogen peroxide production.

A method for the microwave preparation of nano-nickel through chemical reduction in an alkaline environment is disclosed. This invention addresses the problems of complex processes and high energy consumption in existing nano-nickel preparation methods. The steps of this invention include: Step 1, preparing an alkaline solution; placing an ammonia solution in a conical flask and adding a magnetic stirrer; Step 2, adding a nickel salt; adding the nickel salt to the conical flask and stirring until completely dissolved; Step 3, adding a reducing agent; adding the reducing agent to the conical flask and stirring evenly; Step 4, conducting a microwave reaction; placing the conical flask in a microwave reactor for the microwave reaction; Step 5, after the reaction is complete, removing the conical flask, separating the precipitate, washing, and drying to obtain nano-nickel powder. This invention belongs to the field of nanomaterial preparation technology.

1. The name of the design product: magnetic stirrer. 2. The use of the design product: for stirring low viscosity liquid or solid-liquid mixture. 3. The design points of the design product: in shape. 4. The picture or photo that best shows the design points: perspective view.

This utility model discloses a magnetic stirrer for the preparation of silicon-carbon anode composite materials, belonging to the field of silicon-carbon anode composite material preparation. It includes a worktable, with a power supply battery fixedly connected inside the worktable. A charging interface is fixedly connected to one side of the power supply battery, and a rear baffle is fixedly connected to one side of the charging interface. Through the arrangement of the worktable, power supply battery, charging interface, rear baffle, stirring motor, rotating plate, threaded strong magnetic block, locking frame, movable locking block, inner spring, hollow frame, pad frame, and non-metallic hybrid frame, the magnetic stirrer for silicon-carbon anode composite material preparation becomes more convenient to use. It allows for quick replacement of the internal magnetic blocks after magnetic degradation, eliminating the need to replace the entire stirrer, thus extending the overall service life of the magnetic stirrer, reducing operating costs, and promoting long-term use.

This utility model provides an online particle size and shape testing device, relating to the field of crystallinity testing technology. The online particle size and shape testing device includes a testing instrument and a fixing mechanism for fixing the testing instrument. The testing instrument includes an upper housing, inside which a camera is fixedly connected. A middle cylinder is fixedly connected to the bottom of the upper housing, and a telecentric lens is embedded inside the middle cylinder. One end of the telecentric lens extends into the interior of the upper housing and is positioned directly below the camera. By inserting one end of the testing instrument into the test solution and stirring the solution with a magnetic stirrer, a light source is emitted, and the light is focused by a lens. The image is ultimately received by the camera through the lower cylinder and the telecentric lens. The camera transmits the received data to a control device for display. The control device analyzes the image to determine the proportion of crystalline regions in the polymer, thereby quickly determining the crystallinity of the polymer online.

The utility model belongs to magnetic stirrer technical field, specifically speaking, it is a kind of novel magnetic stirrer, including high cylinder reation kettle;High cylinder reation kettle bottom end is fixedly connected with a set of support column;High cylinder reation kettle top end is equipped with feed inlet;High cylinder reation kettle bottom end is fixedly connected with discharge pipe;High cylinder reation kettle bottom end is fixedly connected with a set of first motor;The output of a set of first motor is all fixed with rotating shaft;A set of rotating shaft one end is all fixed with permanent magnet, to make up for the deficiency of prior art, to solve the magnetic stirrer when carrying out the liquid in inside and mixing, generally all need heating to heat the inside of high cylinder reation kettle, guarantee the dissolution and diffusion of internal liquid, but the existing heating device is generally fixed on the outside of high cylinder reation kettle, cannot move, this leads to heating device when adding heat to inside, there will be local overheating phenomenon, lead to the problem of uneven liquid material mixing.

The application discloses a kind of ZnIn2S4 / amorphous MoO 3‑x Preparation and application of nanodot Z system photocatalyst, it relates to the field of photocatalysis.It is simple to operate, environment-friendly, and the prepared ZnIn2S4 / amorphous MoO 3‑x Nanodot catalyst has excellent hydrogen production performance and stability.First, amorphous MoO 3‑x Nanodot is synthesized by ultrasonic chemical method, then MoO 3‑x Nanodot is loaded on ZIS by one-pot hydrothermal method, and ZM catalyst is obtained.First, a certain amount of ZM catalyst is weighed and placed in a quartz photo-reactor, then triethanolamine aqueous solution without dissolved oxygen is added, argon is introduced to exhaust air, and the reactor is sealed.The reactor is placed in a magnetic stirrer and the temperature of the reactor is maintained by a constant-temperature tank.The application improves the electron-hole separation efficiency of the composite catalyst, reduces the recombination efficiency, and expands the light absorption range.

This invention discloses a general-purpose intelligent magnetic stirrer for chemical laboratories, belonging to the field of chemical laboratory technology. It includes: a constant current source circuit for providing a stable current to the speed control knobs; a microcontroller with a built-in ADC module that sequentially collects the resistance values ​​of each speed control knob via DMA and generates corresponding PWM waves based on the resistance values; a brushless DC motor whose speed is controlled by the PWM waves generated by the microcontroller, and whose speed feedback line is connected to the microcontroller through an isolation circuit to achieve PID closed-loop control; an aluminum alloy stirring platform equipped with eight independently operating motors and the speed control system; and a communication interface enabling a host computer to intelligently control the stirrer. This invention ensures more accurate collection of resistance values, thereby improving the accuracy of motor speed control. This accuracy is particularly important for experiments requiring long-term, continuous, and uniform stirring.

The utility model provides a kind of indoor unit of hanging type air conditioner, it includes: cabinet, first inner cavity and second inner cavity are arranged along the length direction of itself inside it;Indoor heat exchanger and heat exchange fan, are located in first inner cavity;Fresh air module, is located in second inner cavity, fresh air module includes fresh air outlet;Steam humidifying device, is located in second inner cavity, it includes: water tank, water storage compartment is defined in it, the top of water tank is equipped with the gas outlet being linked with fresh air outlet;Heating disc, for heating the water in water storage compartment and form water vapor;Mounting portion, is located in water storage compartment;Magnetic stirrer, it includes: magnetic rotor, is placed in mounting portion and relatively mounting portion rotatable;Rotor drive base, it generates magnetic field after electrification, drives magnetic rotor to rotate in mounting portion, to stir the water in water storage compartment.Magnetic stirrer is set, without complex mechanical transmission structure, simplify overall structure, facilitate installation and maintenance, reduce production cost and maintenance difficulty.

The utility model belongs to the technical field of suspension detection, and discloses a magnetic stirrer suitable for a suspension, which comprises a machine body, a control panel is arranged on one side of the upper surface of the machine body, a carrier plate is arranged on the other side of the upper surface of the machine body, a Schottky bottle is placed on the upper surface of the carrier plate, a stirrer is arranged in the Schottky bottle, and the stirrer is arranged on the lower surface of the machine body. A cavity is formed in the machine body, a strong magnet block and a power transmission mechanism are arranged in the cavity, the strong magnet block is used in cooperation with the stirrer to drive the stirrer to stir, the power transmission mechanism is used for driving the strong magnet block to rotate, and the power transmission mechanism is connected with the control panel. According to the scheme, the Schottky bottle is innovatively adopted to replace a beaker, and a small-caliber bottle opening can inhibit the suspension from overflowing when the suspension is uniformly mixed, so that the result is prevented from being influenced; a magnetic stirring technology is introduced, and the rotating speed and time are fixed, so that personal errors are reduced, suspension uniformity is ensured, and data reliability and precision are improved.

The utility model discloses a kind of pretreatment devices of silicate determination, it is related to silicate detection technical field, including control system, mixing device and liquid quantitative device. Mixing device is rotated by carousel motor drive carousel, cooperate with the switching of coupler positioning and titration container in liquid-adding mixing station and stationary station, magnetic stirrer replaces artificial shake, covers motor drive polytetrafluoroethylene cover in stationary time sealing container;Liquid quantitative device contains five sets of independent units, by five-way injection pump, quantitative liquid pipe and coupler cooperate accurate control reagent addition amount, air pump blow wash pipeline residue ensures accurate quantification. The device can automatically complete the reagent addition of silicate determination pretreatment, mixing, stationary whole process, solve the problem that manual operation error is big, efficiency is low, consistency is poor, improve detection accuracy and standardization, applicable to large-scale batch detection scene.

The application discloses a stirring rod grabbing mechanism for a magnetic stirrer and relates to the technical field of experimental apparatuses. The stirring rod grabbing mechanism for the magnetic stirrer comprises a base, a magnetic stirring table, a grabbing device, a first driving device and a second driving device. The first driving device is installed on the base and is drivingly connected to the second driving device. The second driving device is drivingly connected to the grabbing device to drive the grabbing device to rotate in a stirring bottle, to grab a stirring rod and to make the length direction of the stirring rod parallel to the axial direction of the stirring bottle, so as to take the stirring rod out of the stirring bottle. The technical scheme provided by the application drives the grabbing mechanism to move towards the stirring bottle by the first driving device, to enter the stirring bottle, and drives the grabbing mechanism to rotate in the stirring bottle by the second driving device, to grab the stirring rod, to make the length direction of the stirring rod parallel to the axial direction of the stirring bottle, so as to facilitate taking the stirring rod out of the stirring container.

The utility model discloses a kind of carbon black toluene extractive light transmittance determination's pretreatment device, belong to material detection technical field.The device includes control system, magnetic stirrer, container bottle, toluene bottle, toluene injection pump, mixed solution injection pump, toluene filter, mixed solution filter, cuvette and corresponding pipeline.Control system is electrically connected with magnetic stirrer, toluene injection pump, mixed solution injection pump respectively, can automatically control toluene addition amount, stirring time and mixed solution delivery volume.Toluene is filtered after toluene filter, and by toluene injection pump is injected into container bottle, and is mixed with carbon black sample and is stirred by magnetic stirrer;Mixed solution is filtered after mixed solution filter, by mixed solution injection pump is delivered to cuvette, and preparation of determination liquid is completed.The device realizes the automation of carbon black toluene extractive pretreatment, reduces artificial error, reduces the contact risk of operator and toluene, improves detection efficiency and repeatability, applicable to industrialization batch detection.

The utility model provides a kind of cocktail machine, including casing, control box, first multichannel valve group, second multichannel valve group, first pump and second pump, wherein, the top of casing is horizontally respectively provided with first feed bin and second feed bin, first feed bin is used to assemble storage base liquor raw material jar, second feed bin is used to store if juice bubble water etc. auxiliary material, two feed bins are respectively discharged to bearing platform by different multichannel valve group and peristaltic pump, it is convenient to mix cocktail when user mixes cocktail according to own selection, two feeds avoid mutual pollution of base liquor and auxiliary material at the same time, can be distributed storage according to the usage of different material, canned base liquor is more standardized, through bulky material bucket storage auxiliary material is also more suitable, after discharging, base liquor and auxiliary material can be mixed evenly by magnetic stirrer on bearing platform, a cocktail is quickly completed, it is convenient to use and high efficiency.

The application relates to the technical field of microorganism sterilization, and discloses a microorganism rotating field sterilization device and a flow velocity determination method, which comprise a magnetic stirrer and a camera, the upper surface of the magnetic stirrer is provided with a beaker, the inside of the beaker is provided with a sterile rotor, the outer wall of the beaker is respectively provided with an arc-shaped frame and a fixing frame, the inside of the fixing frame is rotationally connected with a threaded rod, the outer wall of the threaded rod is threadedly connected in the inside of the arc-shaped frame, the upper surface of the fixing frame is fixedly connected with a fixing block, the inside of the fixing block is provided with a sterile iron wire, the inner side of the sterile iron wire is provided with a sample, and the inside of the beaker is provided with a sterile float. Through the limiting mechanism, the limiting block clamps or releases the sterile iron wire inserted into the inside of the fixing block, the sterile iron wire is prevented from deviating or shaking due to the fluid disturbance of the rotating field in the beaker, the sample at the lower end of the iron wire is ensured to be stably located in the middle of the cleaning liquid, and the uniform contact of the sample and the sterilization medium is ensured.

The application provides a method for extracting exchangeable base ions of saline soil, which comprises the following steps: placing the soil to be measured and a lithium chloride exchange solution on a magnetic stirrer to perform magnetic stirring, filtering and collecting the filtrate, and measuring the exchangeable base ions of the saline soil. Compared with the prior art, the application has the following advantages: high accuracy and strong anti-interference ability; the lithium chloride can effectively replace the ions on the soil colloids, and can reduce the dissolution promoting effect on associated salts; high-concentration ethanol significantly reduces the dissolution ability of water on ionic salts, and also reduces the dissolution power; the two are synergistic, which double inhibits the dissolution of associated salts from the aspects of thermodynamics and kinetics, eliminates the interference of dissolved salts, and realizes the direct and accurate measurement of exchangeable calcium, magnesium and potassium; the operation is simple, the efficiency is extremely high, the reagents and samples are saved, the calculation result of sodium ions is reliable, and the universality is strong.

The invention discloses shrimp and crab breeding sperm and egg automatic insemination and distribution equipment which comprises a base, a positioning block is installed at the top end of the base, inlets are formed in the top ends of a sperm collecting bin, an egg bin and a water bin, and a stirring mechanism comprises a servo motor installed on one side of a fertilization bin. The servo motor is installed on one side of the fertilization bin, the servo motor works to drive the rotating shaft to rotate, the rotating shaft rotates to drive the miniature magnetic stirrer to rotate, the servo motor is driven at a low speed, the miniature magnetic stirrer is made of a polytetrafluoroethylene coated magnetic core material, and the edge of the miniature magnetic stirrer is subjected to arc chamfering treatment; the stirring time is set to be 3-5 seconds, sperm motility decline or ovum rupture caused by too large stirring intensity is avoided, no stirring shaft is exposed in the structure, pollution dead angles are reduced, and a mature low-damage scheme for mixing the aquatic gametes is provided; therefore, the purpose that the automatic insemination and distribution equipment for the sperms and the eggs for shrimp and crab breeding is convenient for stirring gametes is achieved.

The application discloses a kind of automatic whole blood pretreatment device and method for detecting glycosylated hemoglobin, including magnet delivery module, sample disc module, magnetic stirring module and reagent delivery module;Wherein the magnet delivery module includes the warehouse for accommodating multiple magnets, the feeder in contact with the magnet outlet of warehouse, the drive of drive feeder, the feeder includes recess, the size of recess is suitable for accommodating one magnet;Drive feeder, so that the feeder drives recess moves between the magnet outlet of warehouse and sample disc module;Sample disc module includes the sample disc for containing sampling tube and the drive for driving sample disc rotation, and sample disc is located below feeder;Magnetic stirring module includes the magnetic stirrer below sample disc;Reagent delivery module includes reagent delivery device above sample disc.The device can automatically perform reagent mixing and other pretreatment, which greatly improves the processing speed.

1. The name of the design product: high-temperature digital magnetic stirrer. 2. The use of the design product: digital magnetic stirrer for sample heating and stirring in medical, chemical industry, detection and scientific research scenes. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: design 1 perspective view. 5. Design 1 is designated as the basic design.

The present application relates to the separating technical field of bulk materials, in particular to a pavement marking paint glass bead separating test device and method, the present application adopts three series separating columns to separate the premixed glass beads of the pavement marking paint, the cleaning liquid can be circulated and dissolved and cleaned in the three separating columns through a liquid circulating pump, three parallel tests can be simultaneously conducted, the test time is reduced and the test efficiency is improved. The separating column is placed above a magnetic stirring heater, the sample can improve the dissolving speed through the magnetic stirrer during the dissolving and cleaning process. The present application can save a large amount of test time during the test process. The use rate of the organic solvent is improved, the volatilization of the organic solvent is reduced, the harm of the organic solvent to the test personnel is reduced. The separating time of the glass beads and the quartz sand is reduced, the separating effect is improved, and the accuracy of the test detection result is ensured.

This invention provides a high-throughput liquid workstation for automated cluster synthesis and mass spectrometry sampling in a laboratory. It includes an XYZ three-axis motion mechanism, a rotating disk for holding sample vials, a liquid addition mechanism for adding liquid to the sample vials on the rotating disk, a capping mechanism, a magnetic stirrer, a dilution and injection mechanism, and a working platform. The capping mechanism includes a cap holder, a parallel gripper, and a rotating gripper. The parallel gripper holds the sample vials; the cap holder stores the caps; the rotating gripper is slidably connected to the Z-axis guide rail of the XYZ three-axis motion mechanism, and can move along the X and Y axes or relative to the Z-axis guide rail under the drive of the XYZ three-axis motion mechanism. The rotating gripper can hold, rotate, and move caps or sample vials. These components work together to automate the entire sampling, dilution, injection, and cleaning process, reducing experimental errors caused by manual operation.

A temperature-controlled mixing apparatus used to stir a fluid to be mixed in a mixing device at a preset temperature. The mixing device has a magnetic stirrer accommodated therein. The temperature-controlled mixing apparatus includes: a heat exchange module, a magnetic stirring module and a control module. The heat exchange module includes a heat exchange unit and a cooling and / or heating element. The magnetic stirring module includes a magnetic component and a driving component. The driving component is drivingly connected to the magnetic component. The control module is used to control the cooling and / or heating element to adjust the fluids to be mixed to the preset temperature, and drive the driving component to drive the magnetic component to rotate, so that the magnetic component magnetically attracts and drives the magnetic stirrer to rotate and stir the fluid to be mixed.

This invention proposes an apparatus and method for evaluating the thermal oxidative stability of liquid compounds based on pressure measurement, belonging to the technical field of chemical analysis experimental apparatus. The apparatus includes an oxygen supply unit, a reaction unit, a cooling unit, and a pressure measurement unit. The oxygen supply unit controls the vacuuming and oxygenation of the apparatus. The reaction unit achieves precise temperature control and homogenization of the reaction liquid through a high-temperature heating circulating bath and a magnetic stirrer. The cooling unit eliminates interference from volatile products on pressure measurement through a cryogenic trap. The pressure measurement unit collects system pressure data in real time using a high-sensitivity pressure transmitter and transmits it to a computer. The method involves evacuating the apparatus and then oxygenating it to a set pressure, heating and maintaining the reaction temperature, monitoring system pressure changes through the pressure transmitter, and recording data and calculating oxygen consumption on the computer. This invention can track the oxygen consumption rate in real time, reveal the oxidation pattern, and is suitable for rapid and accurate evaluation of the thermal oxidative stability of various liquid compounds.

The application discloses a preparation method of a sheet-shaped sodium-ion battery positive electrode material sodium copper iron manganese oxygen, which comprises the following steps: step one, accurately weighing raw materials required for synthesizing the sodium-ion positive electrode material by using an electronic analytical balance, and adding the raw materials into a mixed solution of acrylic acid and water under the condition of magnetic stirring; step two, placing the mixed solution into a constant-temperature magnetic stirrer, and heating to perform constant-temperature reaction under the condition of magnetic stirring, and adding an ammonium peroxodisulfate solution as an initiator during the constant-temperature reaction; step three, after the constant-temperature reaction is completed, the solution gradually changes into a gelatin-like gel, the reaction-completed gel is placed into an oven for drying, the dried material is loaded into a pot for pyrolysis, and the pyrolyzed material is subjected to crushing treatment to obtain a semi-finished product powder; step four, loading the semi-finished product powder into a pot and sintering; and step five, after the sintered material is discharged, the material is subjected to crushing, magnetic removal, packaging and detection to obtain a finished product.

The utility model relates to the field of magnetic stirrers especially a heat collecting constant temperature heating magnetic stirrer, including base, the top fixed mounting of base has heating container and temperature probe, and its lateral surface is provided with control unit, the inner wall fixed mounting of heating container has the heating element of control unit electric connection, and its inside can place stirring container, wherein, the top of base is located the lateral surface of heating container is provided with the clamping piece through adjusting assembly, adjusting assembly is used for adjusting clamping piece to fix different specifications stirring container conveniently, can fix stirring container, like this effectively prevent because the reason of stirring rotor overspeed leads to the situation that stirring container inclines or shakes, and utilize the effect of adjusting assembly can adjust the height and the width of clamping piece of clamping, be convenient for adapt to different width and height's heating container, simple structure and strong practicality.

The application discloses a two-component polyurethane adhesive based on a Diels-Alder dynamic covalent structure and a preparation method and application thereof. The method is as follows: using a constant temperature magnetic stirrer, polyether and diisocyanate are fully mixed under a solvent-free condition, a catalyst is added, and a polyurethane prepolymer is obtained by reaction, serving as an A component; using a constant temperature magnetic stirrer, a chain extender is synthesized by reaction in a solvent, the chain extender is fully mixed with a crosslinking agent, and the solvent is removed in a vacuum oven to obtain a dihydric alcohol mixture, serving as a B component; the A component and the B component are uniformly mixed to obtain the polyurethane adhesive. The adhesive contains the Diels-Alder dynamic covalent structure, has dissociable characteristics, has high lap shear strength, has a mild bonding temperature, and has an easy-to-achieve dissociation temperature, and can avoid damage to a substrate during bonding and dissociation, and has a good application prospect in the fields of automobile assembly, electronic device packaging, composite material bonding and the like.