96results about How to "Improve self-healing efficiency" patented technology

The invention provides dihydric alcohol containing an acylhydrazone bond, dihydric alcohol containing an acylhydrazone bond and a disulfide bond, a self-repairing polyurethane elastomer and a preparation method thereof. The polyurethane elastomer is prepared from the dihydric alcohol containing the acylhydrazone bond or the dihydric alcohol containing the acylhydrazone bond and the disulfide bond and a polyurethane prepolymer. The dihydric alcohol containing the acylhydrazone bond is prepared from a dihydrazide monomer and hydroxy aldehyde. The dihydric alcohol containing the acylhydrazone bond and the disulfide bond is prepared from a dithio lipid monomer, hydrazine hydrate and hydroxy aldehyde. The polyurethane prepolymer is prepared from a polyester or polyether polyol monomer and diisocyanate. After the self-repairing polyurethane elastomer is mechanically damaged, the acylhydrazone bond or the disulfide bond on a crosslinked polymer molecular chain achieves material self-repairing through dynamic exchange reaction. The self-repairing crosslinked polyurethane elastomer material is simple in preparation, can achieve self repairing at room temperature, is high in repairing capability, short in repairing time and capable achieving many times of self repairing and has better mechanical properties.

The invention relates to the field of new materials, in particular to a self-repairing reprocessable polyurea material as well as a preparation method and application. The self-repairing reprocessablepolyurea material comprises the following raw materials in parts by weight: 3 to 13 parts of a cross-linking agent, 79 parts of amino-terminated polyetheramine, 8 to 18 parts of diisocyanate, and 1 to 5 parts of a catalyst. The polyurea material is obtained by reacting an amino group with isocyanate, and is a novel heat-responsive dynamic bond under the action of high temperature or the catalyst,so that the material can be self-repaired at 80 DEG C, and the interaction of hydrogen bonds between urea bonds can improve the mechanical strength of the material; and the polyurea material is excellent in mechanical properties, endowed with certain transparency, good in reworking properties, high in self-repairing efficiency, relatively low in repair temperature, simple in preparation technology, and low in relative cost.

The invention provides a a design strategy of a novel adhesive hydrogel material and obtains a high-extension, self-healing, and high-adhesion biocompatible hydrogel material. Based on a double network structure design principle, polymerizable polyethylene glycol-based high polymer constitutes a first covalent crosslinked network, and hydrophilic high polymer with ultra-high molecular weight forms a second noncovalent crosslinked network through entanglement. A mesh size of a first network is larger than a molecular effective size of second network high polymer, and molecular weigh of high polymer forming a second network should be larger than a critical entanglement molecular weight thereof, so that effective molecular entanglement is formed, high-extension, self-healing, and high-adhesion characteristics are given to double network hydrogel. The novel hydrogel can rapidly and repeatedly form stable adhesion with surfaces of various materials. Damaged by an external force, the hydrogel can rapidly and repeatedly perform self healing. The material can be used as a cell cultivating carrier, a sewing-free novel dressing, and can be applied to wearble sensors.

The invention discloses a stretchable self-healing hydrogel flexible strain sensor. A self-healing hydrogel with a high stretchability is obtained by a one-step sol-gel technology, and the multifunctional flexible strain sensor is obtained by packaging using an adhesive tape. The hydrogel-based flexible strain sensor has a high sensitivity factor, and can be used for detecting the tensile strain and the compressive stress; and real-time detection of small strenuous human exercises is achieved due to the high stretchability and the low hysteresis behavior. The interaction of unique coordinationbonds and hydrogen bonds in the hydrogel make the sensor have a short self-healing time and a high self-healing efficiency, so the problems of damages and no recovery after tensile failure of flexible sensors are solved. The flexible sensor designed in the invention has the advantages of simple preparation process, time and labor saving and excellent performances, and can be widely applied to thefields of real-time health monitoring, flexible robots, clinical diagnosis, flexible electronic skins and smart home products.

On the basis of the current situation of self-repairing polyurethane materials, the invention provides an aromatic terminal hydroxyl chain extender containing an acylhydrazone bond, self-repairing polyurethane prepared by using the aromatic terminal hydroxyl chain extender and a preparation method of the self-repairing polyurethane. Compared with dihydric alcohol containing an acylhydrazone bond, the aromatic terminal hydroxyl chain extender containing the acylhydrazone bond has the advantages that the molecular structure of the aromatic terminal hydroxyl chain extender has the large pi bond of a hydrazide benzene ring and the pi-pi conjugative effect of the pi bond of carbon-oxygen double bonds, and accordingly the chain extender is stable in structure. The prepared self-repairing polyurethane has the advantages that the molecular chain of the polyurethane contains the reversible acylhydrazone bond, can achieve self-repairing under room temperature, and is high in repairing efficiency and good in mechanical performance. The preparation of the self-repairing polyurethane has the advantages that the method is simple, raw materials are products which are commercially produced, and the prepared polyurethane is high in performance controllability and promising in application prospect.

The invention provides tough stretchable compressible polymer / graphene oxide nano composite hydrogel and the tough stretchable compressible polymer / graphene oxide nano composite hydrogel has excellentself-repairing performance. Under the existence of graphene oxide, by free radical polymerization of acrylamide (AM) and acryloyloxyethyl trimethyl ammonium chloride (DAC), the cationic polyacrylamide / graphene oxide (GO) hydrogel is prepared. Mechanical performance and self-repairing capacity can be regulated by content of GO and a mass ratio of the AM to the DAC. An ionic bond between the DAC and the GO and a hydrogen bond between the AM and the GO can effectively dissipate energy and reconstruct a network. The obtained composite hydrogel has high rigidity (Young modulus: to 1.1MPa), high toughness (to 9.3MJm<-3>) and high fatigue resistance, and a high self-repairing rate (tensile strength of over 92%, tensile strain of over 99% and toughness of over 93%). The tough stretchable compressible polymer / graphene oxide nano composite hydrogel are simple in step, convenient to operate and high in practicality.

The invention discloses a self-repairing microcapsule used for a metal anticorrosion coating and a preparation method thereof, which belong to the technical field of self-repairing materials. The wall material of the self-repairing microcapsule is urea resin, the core material of the self-repairing microcapsule is natural plant oil, and the self-repairing microcapsule is prepared with a one-step in-situ polymerization method. The natural plant oil has the advantages of wide source and low cost and is easy to obtain. The metal anticorrosion coating is coated on the surface of metal to form an anticorrosion coating. Microcracks appear in the long-term use process, the self-repairing microcapsule embedded in the coating is broken by external force, and released natural plant oil and oxygen in the air can directly generate crosslinking polymerization reaction without catalysts to repair the microcracks to prevent the surface of the metal from being further corroded. The self-repairing microcapsule synthetized by the core material substance has the advantages of good mechanical performance, simple preparation technology and low cost and can be widely applied to the self repairing of metal anticorrosion coatings, such as automobile industry, ship industry and the like.

The invention discloses a reversible self-repair antibacterial acrylic coating and preparation and self-repair methods. The preparation method comprises the steps of adding methyl methacrylate, butyl acrylate, sulfonyl betaine methacrylate and acetoacetoxy methacrylate gylcol ester into an alcohol solvent, and performing free radical polymerization under the initiation of azodiisobutyronitrile to obtain linear acrylic resin; and dissolving the linear acrylic resin and amino-containing hyperbranched polysiloxane into the alcohol solvent, coating the surface of a base material, and drying, thus obtaining the reversible self-repair antibacterial acrylic coating. Efficient and mild repair of the coating is realized by using the characteristic of reversible reaction of vinylogous urethane bonds at room temperature and amino rich at the terminal of the hyperbranched polysiloxane, and the acrylic coating is endowed with excellent antibacterial property by the safe, nontoxic and non-specific sulfonyl betaine. The product has good applicability and strong practicability; the preparation method has the characteristics of wide raw material source, simple process and environment friendliness.

the invention provides a self-repairing anticorrosive outdoor building graphene coating and a preparation method thereof. The graphene coating is obtained by mixing self-repairing microcapsules, polytetrafluoroethylene resin, sodium dodecyl benzene sulfonate modified graphene dispersion liquid and additives, wherein the capsule core of the self-repairing microcapsule is a polyurethane prepolymer (IPDI) which is generated by 1,4-butanediol(BD) and isophorone diisocyanate and the capsule wall is made of polyurethane. The outdoor building graphene coating provided by the invention comprises the self-repairing microcapsule, so that the self-repairing performance and the repairing effect of the coating are remarkably improved, and the addition of the graphene improves the corrosion resistance of the coating and is combined with the self-repairing microcapsule, thus the comprehensive performance of the household paint is further remarkably improved, and the application prospect is excellent.

The invention discloses a preparation method of waterborne flame-retardant self-repairing polyurethane based on modified graphene. The method comprises the following steps: firstly, ultrasonically crushing amino cyclotriphosphazene and isocyanate silane covalently modified graphene oxide, then reacting with macromolecular diol, a hydrophilic chain extender and diisocyanate, terminating with diselenide diol, neutralizing, emulsifying, and adding waterborne self-repairing polyurethane containing diselenide bonds so as to obtain the waterborne flame-retardant self-repairing polyurethane emulsion. According to the invention, by reducing the size of graphene oxide and modifying a waterborne polyurethane chain, the water dispersion stability and the dispersion uniformity and compatibility of the graphene oxide in the membrane are improved, so that the mechanical strength of the membrane is improved; due to nitrogen phosphorus silicon modification, the flame retardant property is further improved; the material is endowed with a good room-temperature illumination self-repairing function through double selenium bonds; and the method provided by the invention is environment-friendly, and the prepared material has high mechanical property and excellent flame-retardant self-repairing function, and can be applied to various fields of leather finishing, fabric finishing and the like.

The invention relates to a preparation method of a fluorinated polyurethane coating and a super-hydrophobic coating, and the method comprises the following steps: preparing a mercaptan prepolymer witha long fluoroalkane chain, and inoculating the fluoromercaptan prepolymer into a polyurethane prepolymer through a simple polyurethane reaction to obtain the fluorinated polyurethane coating; blending and dispersing nanoparticles and the fluorinated polyurethane coating according to a certain ratio, spraying, brushing or impregnating the mixture on the surface of a base material, and after a solvent is completely volatilized, putting the coating in a 70 DEG C drying oven for heat treatment for 5 hours to obtain the super-hydrophobic coating. The coating has high abrasion resistance, and afterthe coating is completely damaged, the super-hydrophobic performance of the coating can be recovered to a large extent within a short time through heating.

The invention relates to a self-repairable and recoverable organosilicon elastomer based on an imine bond, and a preparation method thereof. According to the invention, organopolysiloxane containing adynamic imine bond in its main chain is produced by subjecting an amino group-containing polysiloxane derivative A, a chain extender, i.e., an aldehyde group-containing linear monomer derivative B, and a crosslinking agent, i.e., tris(4-aminophenyl)amine C, to a condensation reaction of amino groups and aldehyde groups, and drying is performed at room temperature under normal pressure to preparethe self-repairable and recoverable organosilicon elastomer. The organosilicon elastomer prepared in the invention has good mechanical properties, recoverability and high self-repairing efficiency, and has broad application prospects in the fields of aerospace, electronics, architecture, military projects, marine exploration, biomedicine, etc.

The invention discloses a self-repairing organic fluorine-silicon modified polyurethane waterproof coating and a preparation method thereof. The coating comprises the following raw materials by mass:60-80 parts of polytetramethylene ether glycol, 15-30 parts of perfluoropolyether glycol, 40-60 parts of isophorone diisocyanate, 20-35 parts of 4, 4'-dithiodianiline, 20-30 parts of fluorine-containing hydroxyl silicone oil, 30-40 parts of tetrahydrofuran, 0.8-2 parts of dibutyltin dilaurate, 2-3 parts of Tween 80, 15-20 parts of nano calcium carbonate, 5-10 parts of nano calcium hydroxyphosphateand 10-20 parts of deionized water; the preparation method comprises the following steps of: S1, preparing a polyurethane prepolymer; S2, dissolving 4, 4'-dithiodianiline and fluorine-containing hydroxyl silicone oil in tetrahydrofuran, then adding the polyurethane prepolymer, and carrying out stirring reaction for 3-6h at a temperature of 60DEG C in a nitrogen atmosphere; and S3, preparing the organic fluorine-silicon modified polyurethane waterproof coating. According to the preparation method, a disulfide bond, a shape memory effect and organic fluorine-silicon modification are combined, and S-S, C-F and Si-O bonds are introduced into a polyurethane molecular chain, so that the hydrophobic and oleophobic properties, high and low temperature resistance, weather resistance, corrosion resistance and the like of the coating are remarkably improved.

The invention relates to a method for improving self-healing of a cold-mix asphalt mixture based on nano carbon fibers, and belongs to the technical field of road repair. The problems that an existingmicrocapsule self-healing technology and electromagnetic induction heating technology are large in limitation, conditions are severe, the research on self-healing of the cold-mix asphalt mixture is not realized by using a microwave heating technology, and the research on using nano carbon fibers and PCL as fillers is not carried out are solved. The method comprises the steps that SBS modified emulsified asphalt is prepared at first, then the modified emulsified asphalt is mized with carbon nanofibers, PCL and the like at room temperature to prepare the cold-mix asphalt mixture, a joist test piece is prepared, a damaged test piece is obtained by using a four-point bending fatigue test, cracks are marked, and finally microwave heating equipment is used for heating the damaged test piece tobe higher than the softening point by 10 DEG C for 30 minutes; and fatigue test is carried out again on the damaged test piece subjected to self-healing and curing to determine the self-healing rate of the test piece so as to determine the optimal mixing amount of the nano carbon fibers. The cold-mix asphalt mixture prepared by the method can improve the self-healing capability of an asphalt pavement.

The invention provides a graphene functional self-repairing microcapsule with a cellular structure and a preparation method thereof, aiming at the problems in a self-repairing system in the prior art,The internal repairing and external fixing graphene functional self-repairing microcapsule with the cellular structure consists of a capsule wall and a curing agent with which the capsule wall is covered, wherein graphene is dispersed in the capsule wall; a series of microcapsules of a micro-nano scale are dispersed in the curing agent to form a cellular structure; the insides of the microcapsules of the micro-nano scale are covered with a repairing agent. The self-repairing microcapsule system has a multi-core coating structure of a micro-nano scale, thereby improving the stability of the microcapsules, increasing the probability of contact between the repairing agent and the curing agent at the same time, and improving the repairing efficiency. In addition, the capsule wall of the self-repairing microcapsule system is modified by silane, an unhydrolyzed silane emulsion left after rupture of the microcapsules can form a hydrophobic film inside concrete capillary holes to prevent further diffusion of moisture, and the hydrolyzed silane emulsion can also participate in the synthesis of a wall material to improve the performance of the microcapsules.

The invention belongs to the field of rubber, and particularly relates to self-repairing rubber. The self-repairing rubber comprises the following components in parts by weight: 60-120 parts of butylrubber, 140-160 parts of polyisobutene, 5-15 parts of an additive, 0.1-0.5 part of sulfur and 0.1-0.2 part of a sulfur accelerator. According to the method, the self-repairing efficiency of the rubbercan be effectively improved, and the damaged part can be repaired within a plurality of seconds; the puncture-proof capacity is high, and under the condition that the puncture depth is far larger than the material thickness by 200%, the rubber can still be prevented from being punctured; in addition, the preparation method is simple and efficient and low in energy consumption.

The invention provides high-hardness thermosetting self-repairing polyurethane and a preparation method thereof. According to the technical scheme, isocyanate-terminated polyurethane containing 2-hydroxyethyl disulfide as a functional group, and polyvinyl alcohol grafted polycaprolactone are cross-linked and cured to synthesize thermosetting self-repairing polyurethane with high self-repairing efficiency, high hardness and transparency. Self-repairing of the material is achieved on the basis of disulfide bond exchange reaction, polyvinyl alcohol grafted polycaprolactone is taken as a cross-linking agent to provide a cross-linking network, and the obtained material has excellent mechanical properties, high Young modulus, good transparency, high self-repairing efficiency, shape memory, reprocessing and other properties. Besides, the invention also discloses a synthesis method of the polyvinyl alcohol grafted polycaprolactone, the polyvinyl alcohol grafted polycaprolactone prepared by themethod has a plurality of hydroxyl sites, the hydrogen bond interaction among molecular chains is increased, and higher chemical and physical crosslinking degree is achieved.

The invention relates to a preparation method and an application method of porous boron nitride nanofiber / polyvinyl alcohol composite hydrogel. The preparation method comprises the following steps: adding porous BNNFs into deionized water to obtain a dispersion liquid; and adding PVA into the dispersion liquid, conducting heating and stirring in a water bath at 90-100 DEG C for 2-4 hours, and naturally cooling the sol obtained after heat preservation to room temperature, thereby obtaining the porous boron nitride nanofiber / polyvinyl alcohol composite hydrogel with favorable self-healing property. The hydrogel obtained by the invention can be retreated by a short-time freeze thawing method, so the mechanical properties of the hydrogel are enhanced, and the hydrogel can be used in the fieldsof biomedicine, wearable flexible electronic devices and the like, and has higher safety usability compared with hydrogel prepared by polymerizing monomolecules via a chemical cross-linking agent.

The invention discloses a 10kV line looped network power supply transfer method. The method comprises the following steps: S1, establishing a line model for 10kV power supply area lines with contact;S2, collecting line parameters, protection information and electrical load conditions of each 10kV power supply line according to the contact conditions; S3, comparing the line load with the line parameter information, and extracting a contact line capable of performing power supply mode transfer; and S4, performing intelligent construction and application of a power supply transfer scheme. An original 10kV power distribution network power supply transfer method is extensive and low in efficiency, and only the power supply transfer scheme and the whole-line power supply transfer in the stationcan be roughly determined. However, the 10kV line looped network power supply transfer method provided by the invention can specifically aim at a certain section and a certain part of a line, it is guaranteed that power supply transfer of part of line sections can be achieved according to accessed nodes during power failure below a certain node, and compared with the prior art, the method is moreaccurate and specific, and the self-healing efficiency after power failure is higher.

The invention belongs to the technical field of novel materials, in particular to a preparation method and application of a silicone rubber film with underwater self-healing capability and adhesiveness. Terephthalaldehyde, isoflurone diisocyanate, tris(2-aminoethyl)amine, 4,4'-diaminodiphenyl disulfide and bis(3-aminopropyl) terminated poly(dimethylsiloxane) are taken as raw materials, and a polycondensation reaction is carried out to form a triple reversible crosslinking network with imine bonds, hydrogen bonds and disulfide bonds. The silicone rubber prepared by the reaction has good mechanical properties, rapid underwater self-healing properties, and excellent adhesion properties and hydrophobicity. The self-healing silicone rubber disclosed by the invention is simple in preparation method and wide in raw material source; and various excellent properties of the self-healing silicone rubber can be used for self-healing waterproof leakage-proof coatings, self-healing waterproof adhesive tapes, protective layers of fragile materials and the like. The viscous self-healing silicone rubber has wide application prospects in the fields of flexible robots and the like.

The invention provides a graphene functionalization self-repairing microcapsule with a cellular structure and a preparation method of the self-repairing microcapsule for the problem existing in a self-repairing system in the prior art. The outer-repairing and inner-curing type graphene functionalization self-repairing microcapsule comprises a capsule wall and a repairing agent coated by the capsule wall, wherein graphene is dispersed in the capsule wall; a series of micro-nano microcapsules are dispersed into the repairing agent, so as to form a cellular structure; a curing agent is coated ineach of the micro-nano microcapsules. The self-repairing microcapsule system has a micro-nano multinuclear coating structure, so that the stability of the microcapsule is enhanced, meanwhile, the contact probability of the repairing agent and the curing agent are increased, and the repairing efficiency is improved. Additionally, the capsule wall of the self-repairing microcapsule system is modified by silane, silane emulsion which is not hydrolysed after the microcapsule is ruptured can form a hydrophobic membrane in a capillary hole of concrete, and the water content can be prevented from being diffused further; in addition, silane emulsion which is hydrolysed can participate in the synthesis of a wall material, so that the property of the microcapsule is improved.

The invention belongs to the technical field of high polymer material preparation, and particularly relates to an acylhydrazone bond-based self-repairing polymer and a preparation method thereof. The preparation method comprises the following steps: dissolving polyethylene glycol, an aldehyde group-containing compound having double end dihydroxy groups and a catalyst into a solvent, uniformly stirring, adding diisocyanate, and reacting to obtain a polymer solution with a side chain containing an aldehyde group; adding a DMF solution of triazine trihydrazide, uniformly stirring, and standing for reaction at room temperature to obtain acylhydrazone bond-based self-repairing polymer gel; and soaking the prepared acylhydrazone bond-based self-repairing polymer gel in deionized water, and regularly changing water to obtain the acylhydrazone bond-based self-repairing polymer hydrogel. The self-repairing polymer disclosed by the invention can realize rapid self-healing of damaged parts at normal temperature under aniline or acidic conditions, and has good mechanical properties, and a product after 7-hour self-repairing can still keep good mechanical properties; and the hydrogel has good biocompatibility and does not cause harm to organisms.

The invention discloses self-repairable epoxy resin and a preparation method thereof. A diimidazole compound, polyamine, a diluent and epoxy resin are mixed to carry out reactions so as to introduce thiourea groups, urea groups and other hydrogen bond groups into an epoxy resin polymer chain segment, self-repairing of epoxy resin is achieved by means of breaking and recombination of intra-molecular or intermolecular hydrogen bonds, and therefore epoxy resin has a good self-repairing function. The self-repairing epoxy resin is high in self-repairing efficiency, simple in preparation process andlow in cost.

The invention belongs to the technical field of concrete, and particularly relates to a composite concrete self-repairing material and application thereof, and a preparation method of self-repairing concrete. According to the invention, calcium and magnesium ions provided by a mineral admixture and carbonate provided by lightweight aggregate increase the concentration of calcium, magnesium ions and carbonate ions at concrete cracks, so generation of calcium carbonate, magnesium hydroxide and magnesium carbonate is facilitated; and water can be taken away and released under a high-humidity condition due to the swelling capacity of water-absorbent resin, and the water is used for supplementing water needed in the forming process of calcium carbonate, magnesium hydroxide and magnesium carbonate and accelerating generation of new C-S-H crystals, so finally, concrete crack closing is promoted, and self-healing efficiency is improved.

The invention discloses a flame-retardant self-repairing waterborne polyurethane composite coating agent as well as a preparation method and application thereof, and belongs to the technical field of production of coating agents. The method comprises the following steps: reacting nano particles with a coupling agent to prepare aminated nano particles; enabling the aminated nano particles to react with phosphonitrilic chloride trimer and diamine, so as to prepare amino-terminated hyperbranched polyphosphazene modified nano particles (HBPC); then mixing polyester glycol, a hydrophilic monomer and diisocyanate to react, so as to prepare an isocyanate group-terminated prepolymer solution; a dynamic reversible covalent bond monomer, a dynamic reversible non-covalent bond monomer and HBPC are added into the prepolymer solution for a reaction, and a chain extension product solution is prepared; and adding a neutralizing agent into the chain extension product solution for reaction to prepare the HBPC waterborne polyurethane with flame-retardant and self-repairing functions. The prepared flame-retardant self-repairing waterborne polyurethane composite coating agent has a hyperbranched and double reversible bond structure, can realize quick and efficient self-repairing at high temperature, and can be applied to flame-retardant self-repairing coatings of wood lacquer.

The invention provides silicon dioxide microcapsule self-repairing anticorrosive paint and a preparation method thereof. The self-repairing anticorrosive paint is prepared by the following steps: dispersing an oil phase formed by a corrosion inhibitor and diethyl ether into a water phase formed by ammonia water, an emulsifier and water; then dropwise adding tetrakis(2-ethoxyethyl) orthosilicate for reaction to obtain an emulsion, then ageing, washing with water and drying to obtain a self-repairing microcapsule material; and then uniformly stirring the microcapsule material, a polyurethane emulsion, an acrylic emulsion, a filler, a defoaming agent and a thixotropic agent. According to the self-repairing anticorrosive paint provided by the invention, the microcapsule material formed by coating the corrosion inhibitor with silicon dioxide is added, and the corrosion inhibitor is good in flowability, high in activity and good in stability, so that the self-repairing efficiency of the paint is improved, the service lifetime is effectively prolonged, the price of used materials is low, the process is simple, the preparation cost is low, and the application prospect is wide.

The invention discloses a self-repairing dielectric elastomer composite material and a preparation method thereof. The self-repairing dielectric elastomer composite material is prepared from the following raw materials in parts by weight: 60-80 parts of polyacrylic acid, 20-40 parts of hydroxyl-terminated polydimethylsiloxane, 5-25 parts of a Ti3C2 filler and 0.7-1.3 parts of a catalyst, wherein the catalyst is N, N ''-dicyclohexylcarbodiimide and 4-(dimethylamino) pyridine. The Ti3C2 filler, hydroxyl-terminated polydimethylsiloxane and polyacrylic acid are dispersed in the organic solvent, and react under the action of the catalyst, so that the self-repairing dielectric elastomer composite material is obtained. According to the invention, the self-repairing performance is excellent, the self-repairing efficiency of the electric driving performance after repairing for 2 h at the room temperature is up to 95% or more, the good dielectric property is provided, the high electric driving strain can be obtained under the low driving electric field intensity, and the preparation method is simple and efficient.

The invention belongs to the technical field of rubber, and discloses double-crosslinking self-repairing epoxidized natural rubber and a preparation method and application thereof. The self-repairingepoxidized natural rubber is mainly prepared from, by weight, 100 parts of epoxidized natural rubber, 3-35 parts of a vulcanizing agent, 0.1-10 parts of sulphur, 0.1-10 parts of a cross-linking agentcontaining disulfide bonds and 0.1-10 parts of a reaction catalyst. The cross-linking agent containing the disulfide bonds is one or more of 2,2'-dithiodibenzoic acid, 4,4'-dithiodianiline, 2,2'-dithiodianiline, 3,3'-dithiodipropionic acid and 4,4'-dithiodibutyric acid. The invention further discloses a preparation method of the double-crosslinking self-repairing epoxidized natural rubber. The double-crosslinking self-repairing epoxidized natural rubber can achieve the high self-repairing rate when being subject to damage, has better mechanical strength, and is conductive to prolonging the service life of rubber products.

The invention relates to a high-strength self-repairing polyurethane material and a preparation method thereof. The high-strength self-repairing polyurethane material is a tough and recyclable polyurethane elastomer with rapid and efficient self-repairing capability. According to the invention, compared with the existing self-repairing elastomer and hydrogel with low strength (generally less than 10MPa) and poor toughness, the high-strength self-repairing polyurethane material has higher practical application value due to high strength and high toughness; the elastomer is composed of a soft segment, a hard segment and a chain extender, wherein hydrogen bonds, disulfide bonds and soft / hard segment microphase separation in the elastomer can achieve a synergistic effect, so that the elastomer has high strength and excellent self-repairing characteristics at the same time; the preparation method of the self-repairing polyurethane elastomer is simple and easy to implement; and due to the fact that the self-repairing polyurethane elastomer is high in strength, good in toughness, high in transparency, high in self-repairing efficiency and capable of being recycled, the self-repairing polyurethane elastomer has potential application prospects in the aspects of synthetic rubber, coating, flexible electronics and the like.

The invention discloses a high-strength self-healing rubber material and a preparation method thereof. The rubber material is prepared from the following raw materials: halogenated butyl rubber, a pyridine derivative grafted modified boron nitride nanosheet, nano zinc oxide, white carbon black, an accelerant and an anti-aging agent. The preparation method comprises the steps of firstly, carrying out free radical polymerization on the boron nitride nanosheet and the pyridine vinyl monomer to obtain a polyethylene polymer grafted modified boron nitride nanosheet of which the side chain containsa pyridine structure, and controlling the weight part of the grafted polymer to a certain extent by adjusting the addition amount of the initiator and the reaction time. Boron nitride with the structure has good mechanical properties and good compatibility with a halogenated butyl rubber matrix, and can form dynamic ionic cross-linking bonds when being uniformly dispersed in the halogenated butylrubber matrix by a mechanical blending method, so that the finally obtained rubber material has high tensile strength and high self-healing performance. The preparation method is simple in process andeasy to realize large-scale production.