550results about How to "Self-healing" patented technology

The invention discloses a high-resilience self-repair high-polymer aquagel and a preparation method thereof. The high-resilience self-repair high-polymer aquagel is prepared from the following raw materials in parts by mass: 15-20 parts of polyisocyanate, 40-75 parts of hydrophilic polyester polyol or hydrophilic polyether glycol, 1-5 parts of acrylate monomer, 10-15 parts of acrylamide monomer, 0.5-2 parts of chain extender, 1-3 parts of surfactant, 0.1-1 part of alkyl acrylate monomer and 0.5-2 parts of catalyst. The preparation method comprises the following steps: preparing an acrylate-monomer-terminated hydrophilic polyurethane high-polymer monomer self-assembly and an alkyl acrylate micelle; and carrying out radical copolymerization with acrylamide monomer under the photoinitiation action. The obtained self-repair high-polymer aquagel can complete self repair on self damage without any repair agent or specific environment, and has excellent resilience and physical and mechanical properties.

The invention relates to the field of hydrophobic paint, in particular to a semiconductor superhydrophobic paint and a preparation method thereof. The method comprises the steps of: a. firstly shearing and stirring hydrophobic nanoparticles and a semiconductive filler evenly, then adding 70%-80% of an organic solvent and conducting mixing; b. mixing thermoplastic film-forming resin with the remaining organic solvent, and performing shearing and stirring evenly; c. mixing the solution obtained in step a with the solution obtained in step b, then adding a low surface energy substance, a curing agent and an additive; and d. subjecting the solution obtained in step c to ultrasonic treatment for 2-20min, and then conducting stirring for 5min-2h till uniform stirring, thus obtaining the product. The semiconductor superhydrophobic paint adopting the scheme provided by the invention can realize self-repair, has no power consumption, and does not decompose surface organic substances.

The invention discloses an upgrading method of an embedded system in the application, which comprises the following steps: an external nonvolatile memory is firstly configured; the external nonvolatile memory is divided, a backup partition is respectively arranged in a core partition and a document system partition so as to prevent the abnormal running situation of the device caused by the abnormality during the upgrading process. When the system runs normally in the working environment, the upgrading process is remotely controlled by an upgrade server, finally the system is restarted, and the normal running state of the system is restored. The upgrading method greatly reduces the development difficulty and the development period, is free from making a precisely-simplified core, reduces the development complexity, improves the stability and makes remarkable progress.

The invention relates to a preparation method of a sulfur-supported graphene aerogel composite material, and belongs to the technical field of lithium ion battery cathode materials. The preparation method mainly includes steps of: subjecting a graphene oxide dispersion liquid, ethanol and sulfur / carbon disulfide which are main raw materials to a hydrothermal reaction at 100-200 DEG C for 6-48 h to obtain sulfur-supported graphene aerogel, and obtaining the sulfur-supported graphene aerogel composite material covered by a polymer through a chemical oxidation method. According to a sulfur-supported graphene aerogel cathode prepared by the preparation method, graphene is staggered and connected to form a three-dimensional conductive network, the supramaximal surface area can absorb more sulfur, and covering by the polymer can overcome a problem of volume expansion of sulphur and a problem of material smashing in charge-discharge processes. In addition, the composite material prepared by the preparation method can be directly used as a pole piece, thus omitting tedious processes, such as pulping and coating in traditional electrode preparation. The preparation method is prone to industrial production.

The invention discloses a flexible high-sulfur load self-repairing cathode structure for a lithium-sulfur battery and a preparation method of the flexible high-sulfur load self-repairing cathode structure, and belongs to the field of electrochemical batteries. The lithium-sulfur battery cathode structure disclosed by the invention is composed of graphene / high-molecular polymer flexible foam and a carbon / sulfur active material layer, wherein the active material is sulfur; and the graphene / high-molecular polymer flexible foam provides strength and a self-repairing function. The flexible high-sulfur load self-repairing cathode structure has the characteristics that a multicomponent integrated design of the lithium-sulfur battery is realized; the electrochemical property is ensured; meanwhile, the content of sulfur is increased; high active material surface density of the battery is realized; the obtained lithium-sulfur battery has the advantages of high specific capacity and high specific energy density, and simultaneously has flexibility and self-healing characteristics; the preparation process of the flexible high-sulfur load self-repairing cathode structure is simple and easy to control; large-scale and low-cost preparation can be realized; and the application value is wide.

The invention discloses a reactive butyl rubber self-adhesive layer for a waterproof roll and a processing technology thereof. The reactive butyl rubber self-adhesive layer comprises the following components in parts by weight: 20 parts of butyl rubber, 1.0-4.2 parts of ethylene vinyl acetate copolymer, 16.5-20.5 parts of tackifying resin, 18.4-24.0 parts of tackifier, 12-18 parts of carbon black, 9-14 parts of light calcium carbonate, 8.0 parts of functional aid, 1.8 parts of vulcanizing agent, 0.8 part of anti-aging agent and 0.5 part of coupling agent. The butyl rubber self-adhesive layer is prepared by mixing, kneading and extruding forming. Due to the mode, the invention provides a reactive butyl rubber self-adhesive layer for a waterproof roll and a processing technology thereof, the butyl rubber self-adhesive layer can be chemically reacted with cast-in-place concrete to form a whole, a permanent waterproof layer is formed and has the self-healing performance, the waterproof layer and various high polymer waterproof rolls can be compounded to form a functional waterproof material, and the reactive butyl rubber self-adhesive layer is suitable for various underground waterproof engineering.

The invention discloses waterproof mortar with a leakage self-repair function and a method for preparing the waterproof mortar. The waterproof mortar comprises, by weight, 10-40% of silicate cement, 5-20% of sulphoaluminate cement, 5-15% of polymers with high water absorption, 3-10% of silicon dioxide powder, 1-3% of dispersing agents, 1-3% of water reducing agents, 5-10% of water-soluble polymers, 3-5% of calcium hydroxide, 10-30% of quartz sand and the balance fillers. The waterproof mortar and the method have the advantages that the problem of leakage due to shrinkage cracking of concrete (mortar) can be solved by the aid of water self-repair processes; the waterproof mortar is convenient and easy to construct; the waterproof mortar can be self-repaired after cracking, and accordingly the problem of trouble of leaking stopping construction on air faces after leakage occurs can be solved; the waterproof mortar can be intelligently self-repaired, a self-repair idea for the waterproof mortar is a combination of stiffness and flexibility, accordingly the waterproof mortar can be used even in dry and wet alternate environments, and effects of the waterproof mortar still can be realized under repeated cracking conditions; the curing time of the waterproof mortar can be controlled, and the waterproof mortar can be used under leaking stopping conditions.

The invention discloses a multi-channel data acquisition device for a submarine pipeline magnetic flux leakage internal detector. The multi-channel data acquisition device comprises a hall sensor, a multi-path switch, an instrument amplifier, an analog-to-digital (AD) conversion module, a field programmable gate array (FPGA), a digital signal processor (DSP) and a secure digital memory (SD) card, wherein the multi-path switch has a two-stage series structure; the multi-channel data acquisition device is provided with heat insulation cotton so as to adapt to a specific high-temperature and high-corrosion environment of a submarine pipeline; the hall sensor converts the magnetic induction density into voltage; the voltage is switched by the multi-path switch, so that a signal is transmitted to the instrument amplifier; the instrument amplifier amplifies a weak signal; the AD conversion module sets sampling for eight times through software, performs analog-to-digital conversion, and transmits a digital value to the FPGA after the conversion; and the DSP receives FPGA cached data, digitally filters and compresses the cached data, and finally stores the data into the SD card. Due to a dual central processing unit (CPU) structure consisting of the FPGA and the DSP, a large amount of data can be stored and processed; the device has the characteristics of high speed, multiple channels, high resolution and the like; furthermore, pipeline transportation safety is guaranteed; and early maintenance is facilitated.

The invention relates to a fireman individual-soldier system on the basis of a wireless Mesh network framework. The system consists of a wireless monitoring mainframe, a plurality of wireless individual-soldier sub-machines and a plurality of wireless repeaters, wherein the wireless monitoring mainframe consists of a monitoring module and a wireless center node module; and each wireless individual-soldier sub-machine consists of a central processing unit module, a positioning module, a vital sign detection module, a distress call module, an environment condition detection module, a carried equipment detection module and a wireless terminal node module. When the fireman individual-soldier system is applied particularly, firemen wear the wireless individual-soldier sub-machines to enter a fire site or other accident sites and a chief officer monitors information such as postures, motion tracks, vital signs, environment conditions, carried equipment conditions and the like through the wireless monitoring mainframe, so that the intelligence support of a command decision is provided for the chief officer in time and a scientific basis can also be provided for daily tactical training. By the fireman individual-soldier system, the modernization, automation and intellectualization levels of a fire command are improved and the battle damage rate of the firemen can also be effectively reduced.

The present invention relates to a kind of magnesium aluminium bimetal composite pipe / rod material. It is formed from interior magnesium alloy pipe / rod material and aluminium alloy layer covering surface of said interior magnesium alloy pipe / rod material. Its processing process includes the following steps: utilizing aluminium alloy and magnesium alloy to prepare combined ingot, heating said combined ingot and heat-insulating, extruding and straightening so as to obtain the invented product. Its extruding ratio is greater than 10, heating temperature is 300-400 deg.C, heat-insulating time is 1-5h and extruding speed is 0.5-3m / min.

The invention discloses a double-network hydrogel based on PEG (polyethylene glycol) and polysaccharides as well as a preparation method and an application of the double-network hydrogel. The chemical-physical / chemical double-network hydrogel is formed under the hydrogen bond interaction between a first chemical network and a second physical / chemical network; the first chemical network is formed by a chemical reaction of a PEG derivative 1 and a PEG derivative 2; the second physical / chemical network is formed by either crosslinking of polysaccharides or derivatives thereof or by interaction between the polysaccharides or derivatives thereof and a crosslinking agent. The high-strength chemical-physical / chemical double-network hydrogel with good self-recovery capability and good biocompatibility has potential application in the following fields: drug sustained-release materials, tissue engineering scaffolds, medical sponge, medical implants and surface coatings of the medical implants.

The invention discloses anionic emulsified modified asphalt and a preparation method thereof and anionic high-adhesiveness waterborne asphalt waterproof coating. The anionic emulsified modified asphalt is prepared from, by mass, 50-70 parts of matrix asphalt, 1-20 parts of a polymer modifier, 0.5-2 parts of nano carbon fibers, 2-5 parts of a surface modifier, 1-2 parts of an anionic surfactant, 0.1-0.8 part of a pH regulator and 20-40 parts of water. A film formed by the waterproof coating has excellent creep performance and extending performance and is capable of well sealing cracks of a baselayer to effectively resist cracking caused by base layer settlement, deformation and the like, water channeling is prevented, and reliability of an upper waterproof roll is improved.

The invention relates to a reactive self-adhered ethylene-propylene-diene monomer waterproof roll which consists of a surface waterproof layer, a middle self-adhering layer and a bottom isolating layer, wherein the surface waterproof layer is formed by co-mixing ethylene-propylene-diene monomer rubber, zinc oxide, sulfur, stearic acid, highly wear-resistant carbon black, processing oil and an accelerator DM, the middle self-adhering layer is an active self-adhered sizing material which is formed by co-mixing asphalt, a softener, a tackifier, butyl rubber IIR (Isobutylene-Isoprene Rubber), butadiene styrene rubber, an activator and filler, and the bottom isolating layer is a PET (Polyethylene Terephthalate) thin film. As the middle self-adhering layer which contains asphalt and active macromolecular active components and has the active reactive self-adhered sizing material is arranged in the upper layer on the inner surface of the surface waterproof layer which takes ethylene-propylene-diene monomer as a main material, so that edges of the roll and the roll and the base layer of concrete are directly adhered by the middle self-adhering layer without any adhesives in match. The generated waterproof layer has a service life effect which is equal to that of a main body material, so that the roll is an ideal upgrading product of existing single ethylene-propylene-diene monomer waterproof roll.

The invention discloses a track wheel pavement repair robot system which comprises a robot body with a power system, wherein a mechanical arm is mounted on the robot body, and a pavement repair device is mounted on the mechanical arm; the robot body is also provided with a control system for controlling the mechanical arm; and the control system is provided with a wireless signal receiving device and electrically connected with the mechanical arm. Specifically, the pavement repair device comprises a grouting device and / or a percussion bit and / or a slotting device. The invention also discloses a pavement repair method. By adopting the robot system disclosed by the invention, intelligent repair can be realized; since only manual remote intervention is needed, the repair safety is improved to a certain degree; and the integrated modular mechanical arm can be disassembled and combined according to actual conditions, and an end repair tool is replaced, thereby improving the utilization efficiency of the modular mechanical arm.

The invention discloses a self-repairing super-hydrophobic composite material, a preparation method and application thereof. The composite material has a structural general formula of: APA / M-PD / APA@HMS, wherein, APA is alkyl primary amine having a long carbon chain with C greater than or equal to 12, PD is polydopamine, HMS is hollow mesoporous SiO2 microsphere, APA@HMS refers to HMS loaded with APA, and the M refers to an antifouling able to stick on PD. The preparation method provided by the invention has the advantages of simple operation, and rich raw material sources, and is suitable for mass production. The prepared APA / M-PD / APA@HMS can be used as a paint additive, can endow a coating with super-hydrophobicity, antifouling property, self-repairability, and durability, and can be used for protective coatings of marine materials.

The invention provides polymer emulsion architectural waterproof coating modified by emulsified asphalt. The polymer emulsion architectural waterproof coating is characterized by being prepared from the following raw materials in parts by weight: 20 to 45 parts of polymer emulsion, 0.2 to 0.5 part of dispersing agent, 0.2 to 0.5 part of emulsifying agent, 0.3 to 0.6 part of defoaming agent, 0.2 to 0.4 part of sterilizing agent, 10 to 35 parts of the emulsified asphalt, 30 to 52 parts of powdery fillers and 7 to 15 parts of water. The polymer emulsion architectural waterproof coating disclosed by the invention has the advantages of good mechanical performance, good weather resistance, strong waterproof ability and acid-base corrosion resistance.

The invention discloses a self-healing type super-amphiphobic and photocatalytic double self-cleaning coating and a method for preparing the same. Mixed solution with fluorine-polyhedral oligomeric silsesquioxane (F-POSS) and photocatalysis particles is coated on the surfaces of base materials to form the self-healing type super-amphiphobic and photocatalytic double self-cleaning coating. The self-healing type super-amphiphobic and photocatalytic double self-cleaning coating and the method have the advantages that the self-healing type super-amphiphobic and photocatalytic double self-cleaningcoating has super-hydrophobic and super-oleophobic super-amphiphobic performance, is capable of photocatalytically degrading organic pollutants adhered on the surfaces of the self-healing type super-amphiphobic and photocatalytic double self-cleaning coating, can be self-healed and can be placed at the room temperature or can be appropriately heated, and accordingly degradation of the super-amphiphobic performance due to long-time illumination can be repaired; the self-healing type super-amphiphobic and photocatalytic double self-cleaning coating is applicable to the surfaces of the base materials for glass, wood, building external walls, diversified textiles and the like with the requirements on self-cleaning functions.

The present invention relates to a hard coating film including a hard coating layer comprising: a crosslinked product of (a) a polyrotaxane compound including a macrocycle to which a lactone-based compound is bonded, wherein a (meth)acrylate-based compound is introduced at the end of the lactone-based compound at a ratio of 40 mol % to 70 mol %, a linear molecule penetrating the macrocycle, and blocking groups arranged at both ends of the linear molecule and preventing the macrocycle from escaping; and (b) a binder resin.

The invention relates to a high-availability industrial Ethernet redundancy method, which comprises the following steps: adding a link redundancy entity on an original data link layer of the Ethernet for managing the sending and receiving of data frames of the Ethernet; setting two network adapter drivers relative to an original protocol stack for managing two network adapter interfaces; connecting a double-connected node which comprises the link redundancy entity and the two network adapter drivers to two independent networks respectively through two network adapters; adding a redundancy control tracker for the data frames on the link redundancy entity for distinguishing the data frames with the same content; sending the data frames which have the same content and is provided with the redundancy control tracker to two mutually-independent networks by the double-connected node through the two network adapters; keeping effective frames and discarding copy frames; and setting up a node table. The method has the characteristics of transparency, self-healing property and compatibility and the like; and the reconstruction thereof is simple, and the safety performance of the system is increased so as to enable the system to have high usability.

The invention relates to a self-repairing film which comprises a transparent carrier layer and a self-repairing function layer coating the transparent carrier layer. The self-repairing function layer is prepared by thermocuring, by weight, 100 parts of polyhydric alcohols, 40-80 parts of isocyanate, 0.05-0.2 part of a catalyst, 0.5-4 parts of a flatting agent and 52-180 parts of a solvent. The self-repairing film has the high hardness and excellent drawing molding performance, self-repairability, oil stain resistance and solvent resistance, and can be applied to the field of in-mold decoration(IMD), the field of 3C product screen protection and the like.

The invention discloses injectable intelligent response hydrogel and a preparation method and application thereof and solves the problems that traditional hydrogel cannot achieve self-repairing afterbeing broken and is poor in adhesive capacity to original tissue in the prior art. The structure of the injectable intelligent response hydrogel is as shown in formula I. The preparation method includes: allowing an aldehyde group modified natural material or synthetic polymer to have Schiff base reaction with a hydrazide natural material or synthetic polymer with a disulfide bond to prepare the injectable intelligent response hydrogel. The injectable intelligent response hydrogel can be used as a drug carrier or / and a biological material. The injectable intelligent response hydrogel is scientific in design, simple to operate, good in injectability and biocompatibility and degradable, has certain adhesive capacity to original tissue, has self-healing performance, pH sensitivity and redox property and is an ideal drug carrier and biological repairing material.

The invention provides a flexible sensor and a preparation method thereof. The flexible sensor comprises a flexible substrate, electrodes, a liquid metal film and a flexible package layer; the liquidmetal film is located on the flexible substrate and composed of liquid metal particles with the oxidized surfaces; the flexible package layer is located on the surface of the liquid metal film; the electrodes are located on the flexible substrate and used for monitoring an electric signal in a certain area of the liquid metal film; and under the effect of external force, the resistance between theelectrodes is changed from the high resistance into the low resistance, and the external force is judged to be harmful external force. The flexible senor can sense the outside harmful external force,and the function of electronic skin can be expanded by integrating the sensor in the electronic skin.

The invention discloses pH-responsive bi-crosslinked mussel bionic adhesive intelligent drug-loading hydrogel as well as a preparation method and application thereof, and belongs to the technical field of medical materials. The preparation method of the pH-responsive adhesive intelligent drug-loading hydrogel comprises the following steps: oxidizing a polymer containing ortho-hydroxyl into a polymer containing an aldehyde group; carrying out a Schiff base reaction with molecules containing amino groups and catechol structures to prepare a functional polymer of which the side chain contains catechol structure micromolecules; a solution of the functional polymer and the antibacterial nano material is mixed with a solution of a polymer containing amino groups and a proper amount of an oxidizing agent, so that the double-crosslinking adhesive drug-loaded hydrogel can be rapidly prepared. By adding hydrophilic drugs or drug-loaded nano particles and the like, application of the drug-loaded nano particles in biomedicine is endowed. The drug-loaded hydrogel is simple in preparation process, has good adhesion performance, can quickly release drugs through pH response, can be naturally dissociated after pH response, does not cause damage to tissues, and has the advantage of good biocompatibility.

The invention discloses a preparation method of mussel-imitated contact antibacterial hydrogel for tissue repair. The preparation method comprises the following steps: adopting methacryl amidated dopamine, anionic monomer and cationic monomer for copolymerization to generate triblock copolymer with opposite charges and mussel-imitated functional groups, doping quaternary ammonium salt modified natural polymer with positive charges into the triblock copolymer to prepare enhanced contact antibacterial ultra-strong polyelectrolyte hydrogel with a semi-interpenetrating network structure. The preparation method disclosed by the invention has the beneficial effects that due to existence of the cationic monomer and natural polymeric modified quaternary ammonium salt, the hydrogel has good antibacterial property; the methacryl amidated dopamine and the surfaces of bacteria generate mutual action to capture the bacteria, so that the antibacterial efficiency of the hydrogel is enhanced; simultaneously, the methacryl amidated dopamine can promote cell adhesion, so that the hydrogel has good cell affinity; in addition, the hydrogel prepared by the invention also has good mechanical property, stable swelling property and self-healing property and can be applied to tissue repair.

The invention discloses a protective coating for inhibiting a platinum bushing from being oxidized and volatilized and reducing the loss of noble metals, a preparation process and application. The protective coating mainly comprises the following components in percentage by weight: 20 to 50 percent of silicon oxide, 20 to 45 percent of aluminum oxide, 5 to 15 percent of sodium silicate and 10 to 25 percent of sodium tetraborate. The protective coating can prevent platinum and rhodium alloys from being oxidized and volatilized at high temperature effectively, and compared with the bushings which are not processed, the bushing which is processed by a coating process can reduce the loss amount by over 30 percent.

The invention provides a preparation method of self-repaired waterborne polyurethane. The preparation method comprises the following steps: after thermal dehydration of macromolecular dihydric alcohol, stirring with diisocyanate for a reaction to obtain a first prepolymer; reacting the first prepolymer with an organic solvent, a micromolecular glycol chain extender containing furan rings, a hydrophilic chain extender, an end-capping reagent and a catalyst to obtain a second prepolymer; neutralizing the second prepolymer with a neutralizer, then reacting with a diamine chain extender in deionized water, and after high-speed dispersed emulsification, carrying out vaccum solvent removal to obtain a waterborne polyurethane emulsion; mixing the waterborne polyurethane emulsion with a maleinimide cross-linking agent, and carrying out a heating reaction to obtain the self-repaired waterborne polyurethane. The self-repaired waterborne polyurethane prepared in the invention can show good mechanical properties and self-repair performance under specific structure conditions, is high in emulsion stability, green and environmentally-friendly, can realize self-repairing under a heating condition, does not need a catalyst, and is mild in condition, simple in operation and good in repair effect.

The invention discloses a distributed web crawler system and an information crawling method. The distributed web crawler system comprises a plurality of control nodes and a plurality of crawling nodes; all the nodes are grouped according to the network distance, and the nodes within the budgeted network distance range form a group; each group comprises a control node, and the other nodes are the crawling nodes; the control node and the crawling nodes in the same group form a master-slave relationship, and all the control nodes form a peer-to-peer network to collectively control operation of the whole system. The distributed web crawler system can dynamically allocate crawling tasks according to a crawling list so as to achieve parallel crawling of massive data by multiple nodes, and is low in cost and high-efficient in performance.

The invention discloses a bio-based self-repair gel based on a boric acid ester bond. The preparation method of the bio-based self-repair gel includes the steps of: (1) taking 3-aminobenzeneboronic acid as the functional group, and modifying a biomacromolecule containing carboxyl to obtain a benzeneboronic acid based biomacromolecule; (2) modifying guar gum with a quaternary ammonium salt to obtain cationic guar gum; and (3) mixing the benzeneboronic acid based biomacromolecule prepared by step (1) with the cationic guar gum prepared by step (2), and utilizing the reversible ester bond formedbetween benzeneboronic acid and guar gum and the electrostatic interaction of positive and negative charges to prepare the bio-based self-repair gel with a double cross-linked network structure. The bio-based self-repair gel provided by the invention has excellent biocompatibility, biodegradability and self-repairability, and has broad application prospects in biomedicine, functional devices, sensing and other fields.

The invention prepares composite water evaporation inhibitor through adopting the built technology. The technical characteristics are that long-chain fatty alcohol and short-chain alcohol are remixed into molecular film base material, stable solution is prepared through dissolving appropriate spreading solvent which is chosen in ambient temperature, thereby obtaining the water evaporation inhibitor. The water evaporation inhibitor which is obtained through the process can automatically spread out on the water level to form an insoluble molecular film, which has favorable temperature interference resistance ability, matter interference resistance and self-restoring ability, and the efficiency of inhibiting water evaporation is reduced as time prolongs, thereby having excellent stability. The preparation process of the invention is simple, and can be prepared in-situ. The water evaporation inhibitor which is prepared has extensive application prospect in water resource protection field, has great significance for solving the problem of water scarcity in arid area and reducing water resource loss, and can bring out enormous economic benefits and social benefits.

The invention discloses self-repairing low-modulus high-strength waterborne polyurethane and a preparation method thereof. The preparation method comprises the following steps that macromolecular diol I, macromolecular polyol II and diisocyanate are subjected to a reaction, and polyurethane prepolymer a<1> is obtained; micromolecular chain extender, hydrophilic chain extender I, a solvent and a catalyst are added, and waterborne polyurethane prepolymer a<2> is obtained by a reaction; then a solvent and hydrophilic chain extender II are added, and waterborne polyurethane prepolymer a<3> is obtained by a reaction; a solvent is added, a salt-forming agent is added under high-speed shearing, water is added for high-speed dispersion and emulsification after even stirring is conducted, then later chain extender diluted with water of 3-5 times is added, and the solvents are removed in vacuum to obtain the product. According to the preparation method, disulfide bonds are introduced in the soft segment and hard segment of waterborne polyurethane, so that the modulus of the waterborne polyurethane is effectively reduced, the strength of the waterborne polyurethane is improved, the waterborne polyurethane has the self-repairing property, and thus self-repairing of polyurethane is achieved without any repairing agent.