3452 results about "Covalent bond" patented technology

The invention relates to the technical field of high polymer materials, and particularly provides a self-repairing type UV curing alumite color layer coating and a preparation method thereof. The water-based ink is prepared from, by weight, 30-50 parts of polyurethane acrylic resin, 10-25 parts of modified acrylic oligomer containing dynamic covalent bonds, 2-5 parts of photoinitiator, 3-8 parts of hydrophobic modified nano filler and 1-3 parts of cross-linking agent, and the dynamic covalent bonds are selected from at least one of hydrazide bonds, boric acid ester bonds and Diels-Alder bonds. By introducing a gradient energy collaborative network of dynamic covalent bonds and quadruple hydrogen bonds, rapid self-repairing of the coating at normal temperature and thermal triggering recombination of deep damage are achieved, and meanwhile through the micro-phase separation design of the hydrophobic core-shell filler and the graft modified silicon carbide nanowires, the hydrolysis resistance is improved.

The invention relates to a catalyst for ethylene oxide ring-opening polymerization and a preparation method thereof, and belongs to the technical field of high polymer material synthesis, and the catalyst is a composite structure based on a silicon dioxide nanoparticle loaded bimetal organic complex; a modified nitrogen-containing polydentate ligand is prepared by adopting a special method, is coordinated with metal ions through covalent bonds and is loaded on silicon dioxide nanoparticles; by utilizing the high dispersity and stability of the silicon dioxide nanoparticles and the synergistic catalytic effect of the bimetal organic complex, the catalytic effect is effectively improved, the polymerization process is accelerated, the polymerization stability is enhanced, the polymerization molecular weight is improved, and the distribution is narrow.

The invention relates to the technical field of metal surface protection, and discloses a corrosion-resistant self-repairing metal fastener and a preparation method thereof.The corrosion-resistant self-repairing metal fastener comprises a zinc alloy matrix, a nanometer passivation layer, a slow-release corrosion-resistant layer and a self-repairing functional layer, and the nanometer passivation layer, the slow-release corrosion-resistant layer and the self-repairing functional layer sequentially wrap the zinc alloy matrix; the zinc alloy matrix consists of Al, Cu, Mg, Ce and Zn; the nano passivation layer adopts zinc phosphate / silane composite sol to construct a Si-O-P covalent bond network, and plasma is combined to graft epoxy groups to enhance the interface bonding strength; the slow-release anti-corrosion layer is used for loading a pH response type benzotriazole derivative through gradient aperture mesoporous silica, so that the dynamic controlled release of a corrosion inhibitor is realized; the self-repairing functional layer adopts a synergistic effect of a mechanical triggering type sulfydryl siloxane microcapsule and a pH triggering type EDTA chelating agent microcapsule to form a physical plugging-chemical passivation dual-mode repairing mechanism. Through four-stage cooperation of matrix modification, interface strengthening, slow-release regulation and control and intelligent repair, the corrosion resistance of the corrosion-resistant self-repairing metal fastener in a complex environment is remarkably enhanced.

The invention discloses a multifunctional electronic product screen protective film and a preparation method thereof. The protective film comprises a modified base film and a multifunctional composite layer compounded on the surface of the modified base film, the multifunctional composite layer comprises an elastic buffer layer and a self-repairing layer which are sequentially arranged from inside to outside; wherein the elastic buffer layer is an elastic buffer layer with gradient density; the elastic buffer layer comprises the following components in parts by weight: 100 parts of a thermoplastic polyurethane elastomer, 15-25 parts of hollow glass microspheres, 10-15 parts of polyethylene glycol and 3-6 parts of an isocyanate cross-linking agent; the self-repairing layer comprises the following components in parts by weight: 100 parts of a dynamic reversible covalent bond polymer, 30-40 parts of phase change material microcapsules, 10-15 parts of nano cellulose, 5-8 parts of a near-infrared photosensitive initiator and 2-4 parts of an antioxidant. Compared with the prior art, the protective film provided by the invention has excellent scratch self-repairing performance, good adhesion and high anti-explosion screen performance.

The invention discloses reactive compatible ACR-PHA core-shell latex and application thereof, and belongs to the field of polymer chemistry and material science. The latex comprises composite particles with core-shell, gradient core-shell, raspberry-shaped or Janus heterostructure, interfaces of ACR phase and PHA phase of the latex are connected through covalent bonds, and the compatibility problem of physical blending is fundamentally solved. The latex particles have a Z-average particle size of 80-400 nm, a PDI of less than or equal to 0.30, and a minimum film formation temperature (MFFT) of-10 to 12 DEG C. The coating prepared by the invention has excellent high-humidity barrier stability (WVTR is less than or equal to 65g / m.d), low-temperature rapid heat sealability, water resistance, oil resistance and complete recoverability, does not contain PFAS, is an ideal alternative scheme of a traditional PE (Polyethylene) spraying film, and is suitable for the fields of food packaging paper, paper cups, bowls and the like.

The present disclosure relates to polymers synthesized from ionomers having an aromatic hydrocarbon-containing backbone and an amine-containing ionic or ionizable moiety with polystyrene. The linkage between the ionomer and the polystyrene is made through covalent bonds or linking moieties. Electrochemical cells having polymer electrolyte membranes composed of the combined polymers are also described.

The invention relates to a dynamic-covalent hybrid cross-linked hydrogel material as well as a preparation method and application thereof. The preparation method comprises the following steps: dissolving a component A-phenylboronic acid modified polymer derivative in a biocompatible medium to obtain a solution A; dissolving a component B, namely a macromolecular derivative containing a vicinal diol group, into a biocompatible medium to obtain a solution B; dissolving a component C-double bond group modified polymer derivative in a biocompatible medium to obtain a solution C; and mixing the solution A, the solution B and the solution C with certain concentrations for a certain time, and performing illumination under a photoinitiator for a certain time to obtain the dynamic-covalent hybrid cross-linked hydrogel material. Compared with single dynamic bond crosslinking or covalent bond crosslinking, the prepared hydrogel material has machinability and mechanical stability; the hydrogel material has plasticity, shear thinning, self-repairing property and the like in the early stage of crosslinking; enough mechanical strength and long-term stability are realized in the later stage of crosslinking.

The invention provides a metal matrix composite microstructure strengthening simulation method and system, and relates to the technical field of composite mechanical property simulation, and the method comprises the following steps: establishing a polycrystalline aluminum matrix atomic model and a spherical silicon nitride particle strengthening phase atomic model unit; embedding the spherical silicon nitride particles into the polycrystalline aluminum matrix according to the target embedding position coordinates, and integrating to generate an atomic scale structure model; according to the method, an embedded atom potential function is adopted to describe interaction among atoms in a polycrystalline aluminum matrix, a Tersoft potential function is adopted to describe covalent bond interaction among atoms in spherical silicon nitride particles, and a Lennard-Jones potential function is adopted to describe interaction among heteroatoms at a Si3N4 / Al interface; based on the interaction potential between atoms, molecular dynamics simulation is adopted for conducting uniaxial stretching simulation on the atomic scale structure model, mechanical property parameters of the particle reinforced metal matrix composite are obtained through calculation, and a visualization method is combined for analyzing the microcosmic strengthening mechanism of the particle reinforced metal matrix composite.

The invention discloses a dual-curing 3D printing resin, the dual-curing 3D printing resin comprises an acrylate oligomer containing a dynamic covalent bond and a blocked isocyanate cross-linking agent, and the acrylate oligomer containing the dynamic covalent bond is obtained by reacting an isocyanate-terminated oligomer with acetoacetic acid ethylene glycol methacrylate. The internal molecular structure and the crosslinking density of the dual-curing 3D printing resin can be changed through heat treatment after light curing, and the dual-curing 3D printing resin has excellent stability and can be stored and used in a single-component mode.

The invention discloses low-migration UV ink-jet ink and a preparation method thereof, and belongs to the technical field of novel ink. Comprising the following components in parts by mass: 10-15 parts of a dynamic cross-linked polyurethane acrylate oligomer, 5-8 parts of an epoxy silicone resin oligomer, 2-3 parts of modified silicon dioxide, 4-5 parts of a photoinitiator, 15-20 parts of sorbic acid modified color paste, 1-2 parts of nano cerium oxide and 0.5-1 part of an antioxidant. The molecular chain of the dynamic cross-linked polyurethane acrylate oligomer prepared by the invention contains an active group capable of forming a cross-linked structure and a dynamic covalent bond. The groups and bonds promote molecular chain crosslinking when the ink is cured, a three-dimensional network is formed, and the molecular crosslinking density is improved. Through interaction of palmitic acid modified silicon dioxide and oligomer, the palmitic acid modified silicon dioxide is uniformly dispersed in a matrix and interferes molecular chain movement during curing, so that the crosslinking density is further improved, an ink film layer is more compact and firmer, the wear resistance and the scratch resistance are improved, and the tinting strength and the stability are indirectly enhanced.

The embodiment of the invention discloses an epoxy molding compound, an epoxy molding film and an electronic component, the epoxy molding compound comprises epoxy resin and a zeolite imidazole framework material, and the zeolite imidazole framework material comprises imidazole ligands and metal ions. The zeolite imidazole framework material is used as a curing agent and a nano reinforced phase, imidazole groups on the surface of the zeolite imidazole framework material can be subjected to a ring-opening reaction with epoxy resin to form covalent bonds, the zeolite imidazole framework material can induce the epoxy resin to generate a microcrack deflection mechanism, and the zeolite imidazole framework material can promote curing of the epoxy resin, so that the epoxy resin is cured, and the curing effect is improved. Therefore, the thermal expansion coefficient of the epoxy molding compound is reduced, the fracture toughness of the epoxy resin is improved, and the thermal stability of the epoxy molding compound is improved.

The invention belongs to the technical field of functional polymer materials, and discloses MXene functionalized antibacterial self-healing hydrogel and application thereof. The hydrogel is obtained by mixing and reacting polydopamine modified MXene powder, modified chitosan and a polyvinyl alcohol solution in a first buffer solution. The dynamic network self-healing conductive hydrogel based on interaction of a dynamic boron ester bond, a Schiff base bond and a non-covalent bond is obtained and can be applied to a flexible strain sensor.

The invention provides a preparation method of modified nanocellulose, a biomass coating and a composite paper wood, the preparation method of modified nanocellulose comprises the following steps: a, oxalic acid is heated to a molten state, bleached wood pulp is added to the molten oxalic acid for a reaction, and nanocellulose is obtained; b, dispersing nanocellulose in water, and mixing with coniferyl alcohol solution, hydrogen peroxide solution and first enzyme solution for reaction to obtain DHP-nanocellulose; c, mixing the DHP-nanocellulose with coniferyl alcohol glucoside, a second enzyme solution and a hydrogen peroxide solution, and reacting to obtain the modified nanocellulose. According to the invention, a plant lignification process is simulated, so that crosslinking in lignin-glycan complex forms such as anisole bonds, ester bonds and the like and connection of covalent bonds such as Beta-aryl ether bonds among lignin are regenerated among separated fibers, and the modified nanofiber with high physical strength is obtained; and some environmental pollution problems caused by the use of raw materials and products in a traditional reinforcing method are solved.

The invention discloses an MXene-based coating with a near-infrared light induction interaction effect and a preparation method of the MXene-based coating, and relates to the technical field of coatings. The preparation method comprises the following steps: a nano microcapsule and MXene powder are subjected to in-situ growth to form a composite dispersion liquid, the nano microcapsule is of a core-shell structure, a shell layer material is selected from at least one of polyaniline, polyurea, polyurethane, polyacrylate and silicon dioxide, a core contains a functional substance, and the surface of the core contains a porous material. The functional substances are selected from at least two of a corrosion inhibitor, a fluorescent indicator and a lubricant; adding a thermal reversible coating containing dynamic covalent bonds and a curing agent into the composite dispersion liquid, and uniformly mixing to form a homogeneous coating; and spraying the homogeneous coating on the surface of a base material, and curing to obtain the coating. The coating is high in mechanical strength, has a near-infrared light triggered self-repairing function, is high in self-repairing rate, and can realize multiple functions such as fluorescence labeling, corrosion early warning and lubrication coordinated regulation and control.

The invention discloses a polymer drug-loaded particle for targeted adhesion to an intestinal inflammation area and a preparation method and application thereof.The method includes the steps that degradable polymer drug-loaded particles are subjected to surface modification through polycations and then added into a monomer solution of an adhesion layer, particle surface in-situ polymerization is initiated through ultraviolet irradiation, and a PAN adhesion layer is formed; the adhesion layer modified polymer drug-loaded particles are obtained. Wherein the polycation is used as a middle layer, so that the PAN adhesion layer can be successfully modified. Carboxyl in the adhesion layer enables the particles to present negative charges, meanwhile, succinimide ester can react with amino naturally existing on the surface of inflammatory intestinal tissue to generate an amide covalent bond, and finally targeted adhesion of the intestinal inflammation part is achieved. According to the adhesion strategy, the PAN can be effectively applied to the micro-nano-scale drug-loaded particles so as to enhance the adhesion of the micro-nano-scale drug-loaded particles in an intestinal tract damaged area, and a brand new thought is provided for treating inflammatory intestinal tracts.

The invention belongs to the technical field of environment-friendly materials, and particularly relates to an MIL-88A-WS2 composite material and a preparation method and application thereof. The preparation method comprises the following steps: mixing WS2 taking a 1T phase as a main phase and MIL-88A in a solvent, then carrying out a hydrothermal reaction, in the hydrothermal reaction process, loading the WS2 taking the 1T phase as the main phase on the MIL-88A, forming a Fe < 2 + > / Fe < 3 + > and W < 4 + > / W < 6 + > circulating channel, covalent bonds and ionic bonds between the WS2 taking the 1T phase as the main phase and the MIL-88A, and meanwhile, forming a hollow structure by the MIL-88A, so as to obtain the MIL-88A-WS2 composite material. The MIL-88A-WS2 composite material obtained by the method provided by the invention has many active sites and strong conductivity, and can act together with an oxidizing agent peroxymonosulfate to realize degradation of phenolic pollutants.

The invention discloses a lignin / carbon black / natural rubber composite material as well as a preparation method and application thereof. The composite material is prepared from the following components in parts by mass: 100 parts of natural rubber, 1-50 parts of lignin, 1-50 parts of carbon black, 0.5-8 parts of a lignin modifier, 1-8 parts of a coordination aid, 0.1-0.5 part of a peroxidation initiator, 0.5-5 parts of elemental sulfur and 0.1-10 parts of a vulcanizing aid. In-situ modification is carried out on the surface of lignin particles, unsaturated double bonds are grafted on the surface of lignin in a rubber mixing process, so that the lignin can form certain covalent bond connection with a rubber chain segment in a vulcanization process, and the content of binding glue on the surface of the lignin is increased; further, interface covalent bond and interface coordination bond connection can be constructed between the lignin and the rubber, and further enhancement of a lignin / rubber system can be realized.

The invention relates to the technical field of biology, in particular to a multivalent pneumococcal polysaccharide-protein conjugate vaccine for preventing pneumococcal infection and respiratory syncytial virus infection as well as a preparation method and application of the multivalent pneumococcal polysaccharide-protein conjugate vaccine. According to the multivalent pneumococcal polysaccharide-protein conjugate vaccine disclosed by the invention, carrier protein is RSV recombinant protein with immunogenicity; the pneumococcal polysaccharide is connected with the RSV recombinant protein through a covalent bond; the RSV recombinant protein is selected from Pre-F protein, and the amino acid sequence of the RSV recombinant protein is shown as SEQ ID NO: 2 or SEQ ID NO: 3. The conjugate vaccine provided by the invention is an innovative vaccine, two common diseases, namely pneumonia and respiratory syncytial virus infection, can be simultaneously prevented by using one vaccine product, and the number of vaccination times of the vaccine is greatly reduced. According to the invention, the carrier protein in the conjugate vaccine is subjected to mutation modification, so that the carrier protein can maintain structural stability and antigen cluster function in different environments.

The invention belongs to the technical field of organic light-emitting materials, and relates to a boron-containing polycyclic compound for an organic light-emitting material. According to the invention, aryl or heteroaryl is taken as a center, 2-3 boron atoms are introduced and form covalent bonds with atoms such as N, O, S and Se, and a rigid polycyclic compound is constructed. The compound provided by the invention is a boron-containing polycyclic compound with multiple resonance effects, can realize narrow-spectrum and high-color-purity luminescence, also has efficient TADF characteristics, and significantly improves the performance of OLED devices. Compared with the prior art, the compound has remarkable advantages in the aspects of molecular structure design, photoelectric property regulation and control, application range and the like, provides important technical support for development of new-generation high-performance OLED materials, and has wide market prospects and application potential.

The invention relates to a polypropylene insulated power cable and a preparation method thereof, and belongs to the technical field of cables. The polypropylene insulation power cable comprises a copper conductive wire core, a metal shielding layer and a sheath layer, the metal shielding layer comprises a conductor shielding layer, a polypropylene insulation layer and an insulation shielding layer which are arranged from inside to outside, and the sheath layer comprises polypropylene, organic modified graphene, lignite wax, an antioxidant and an anti-UV agent; graphene and agarose form a firm covalent bond compound, then glycidyl methacrylate and eugenol are used for coating the outer layer of a graphene / agarose particle core, the dispersity and compatibility of graphene in a system are remarkably improved, and then the tensile strength and elongation at break of a polypropylene sheath layer material are remarkably improved; therefore, the polypropylene insulated power cable has excellent mechanical properties.

A carbon-coated current collector. The carbon-coated current collector comprises a foil and a conductive coating arranged on the surface of the foil. The conductive coating comprises a combination of a modified conductive carbon material and a binder. The binder is prepared from the following raw materials in parts by weight: 40-60 parts of methyl isobutyl ketone, 25-30 parts of a solvent, 20-25 parts of isobornyl methacrylate, 20-25 parts of methyl methacrylate, 20-25 parts of n-butyl acrylate, 20-25 parts of hydroxyethyl acrylate, 18-22 parts of silicone oil, and 50-55 parts of an initiator. The modified conductive carbon material is a fluorosilane-modified carbon material. The modified conductive carbon material and the binder can form silanols by means of hydrolysis reaction of respective alkoxy groups, then the silanols form new hydrogen bonds with OH groups, and covalent bonds are formed on the surface of the carbon material, thereby forming a highly cross-linked network structure, which further enhances water resistance, allowing for the ability to withstand 200 or more wiping operations.

The invention belongs to the field of olefin polymers, and relates to a reversible cross-linked polyolefin elastomer and a preparation method thereof. The reversible cross-linked polyolefin elastomer is a reversible cross-linked polyolefin elastomer in which a cross-linked network is formed through three non-covalent bonds, namely hydrogen bonds, ionic bonds and coordinate bonds, and the hydrogen bonds and the cross-linked bonds account for 0.1-85% by taking the sum of the three non-covalent bonds, namely the hydrogen bonds, the ionic bonds and the coordinate bonds as 100%; the ionic crosslinking bond accounts for 0.5-90%; and the coordination crosslinking bond accounts for 9-99%. Compared with a reversible cross-linked polyolefin elastomer in the prior art, the reversible cross-linked polyolefin elastomer prepared by the invention contains hydrogen bonds, ionic bonds and coordinate bonds at the same time, and a synergistic effect is generated through combination of reversible cross-linked interaction of the coordinate bonds, the hydrogen bonds and the ionic bonds; therefore, the material has excellent physical and mechanical properties and also has recoverability and self-repairability.

The invention discloses a silane cross-linked polyolefin halogen-free flame-retardant cable material and a low-energy-consumption preparation method thereof.The preparation method comprises the steps that EVA / EEA serves as a matrix, silane groups are covalently connected to a polyolefin molecular chain through a free radical grafting reaction, and a grafting material containing an active silane side group is prepared; meanwhile, vinyl isocyanate is adopted to chemically modify hydroxyl on the surface of magnesium hydroxide, vinyl is grafted to the surfaces of particles, the polarity of the particles is reduced, and the dispersity of the particles is enhanced; then carrying out melt blending on the grafted material and modified magnesium hydroxide, constructing an interface bridge by using an anhydride group, and shortening the two-phase distance; finally, through room-temperature natural cross-linking and warm water auxiliary cross-linking, silane groups are promoted to be hydrolyzed into silanol, the silanol is condensed to form a-Si-O-Si-three-dimensional network, meanwhile, vinyl on the surface of magnesium hydroxide and a polyolefin matrix are subjected to free radical copolymerization, and a covalent bond interface layer is formed between inorganic particles and an organic matrix. According to the method, the synergistic improvement of high crosslinking degree, strong stretchability and excellent flame retardance of the cable material is realized through molecular-level interface regulation and cross-linking network optimization.

The invention discloses an interface covalently bonded core-shell structure boron nitride polypropylene composite dielectric material and a method. The interface covalently bonded core-shell structure boron nitride polypropylene composite dielectric material comprises a maleic anhydride grafted polypropylene matrix and a core-shell structure filler dispersed in the maleic anhydride grafted polypropylene matrix, the core-shell structure filler comprises hydroxylated boron nitride nanoparticles covalently grafted on a polymer shell layer on the surface of the core-shell structure filler; the polymer shell layer is polyglycidyl methacrylate; the epoxy group of the polymer shell layer reacts with the anhydride group of the maleic anhydride grafted polypropylene matrix to form a covalent bond. The invention has the characteristics of strong interface bonding force, uniform filler dispersion, and excellent comprehensive electrical properties and processability.

The invention discloses an immobilized organic base catalyst and a preparation method and application thereof, the immobilized organic base catalyst comprises functionalized activated carbon, the functionalized activated carbon has a Bronsted base site comprising an organic Bronsted base molecular structure, the organic Bronsted alkali molecular structure is connected to the surface of the functionalized activated carbon through a covalent bond. The immobilized organic base catalyst is a heterogeneous active carbon-based immobilized organic # imgabs0 # base catalyst, and has the advantages of low preparation cost, high reaction activity, good stability and the like.

The invention discloses a flame retardant with a double-layer microcapsule structure, a flame-retardant polyurethane material as well as a preparation method and application of the flame-retardant polyurethane material, and belongs to the technical field of flame retardants. The material is a multifunctional flame retardant with a double-layer core-shell structure, a shell layer is calixarene boric acid resin, a middle shell layer is melamine phthalic anhydride resin, and a core layer is hydroxyapatite modified aluminum hypophosphite. Due to the high cross-linking degree between polymers, the flame retardance of polyurethane is improved, meanwhile, the mechanical property of the polyurethane is improved, and the flame retardance and seawater corrosion resistance of the material are synergistically enhanced through hydroxyapatite dispersed in the core layer. The double-shell layer has excellent hydrophobicity, prevents internal aluminum hypophosphite from being affected with damp and has anti-fouling and self-cleaning effects, and the prepared flame-retardant polyurethane composite material has excellent tensile and flexible characteristics due to a double network of hydrogen bonds and covalent bonds.

The invention discloses nanoparticles for a contrast agent as well as a preparation method and application of the nanoparticles, and relates to the technical field of nano composite materials. According to the nanoparticle for the contrast agent, a shell layer comprises polydopamine and albumin which are connected through a covalent bond, a core structure comprises a complex formed by metal ions and polyphenol, and the metal ions in the core structure and the polydopamine in the shell layer also have a coordination effect. Due to the fact that all the components are tightly connected, the rotation time of the nano-particles is prolonged, the T1 relaxation rate of the nano-particles is greatly increased, meanwhile, due to introduction of polydopamine, release of metal ions in a human body is avoided, the biological safety of the nano-particles is improved, albumin in the nano-particles can further improve the biocompatibility of the particles, and the nano-particles can be used for preparing the nano-particles. Therefore, the nanoparticles provided by the invention also have wide application prospects in the fields of fluorescence imaging and targeted drug delivery.

The invention discloses a self-repairing nylon elastomer material as well as a preparation method and application thereof. The preparation method comprises the following steps: S1, polymerizing a nylon monomer in the presence of an amine end-capping reagent to prepare a double-amino-terminated nylon hard segment; s2, adding the double-amino-terminated nylon hard segment, the double-carboxyl-terminated polyether and / or polyester soft segment and a disulfide bond-containing chain extender into a reactor, adjusting the proportion of the raw materials, and polymerizing under an optional auxiliary A to obtain a double-amino-terminated pre-polymerized nylon elastomer; and S3, adding the double-amino-terminated pre-polymerized nylon elastomer and a dialdehyde chain extender into the reactor, and carrying out a reaction in the presence of an optional auxiliary agent B to obtain the self-repairing nylon elastomer material. According to the self-repairing nylon elastomer material provided by the invention, the nylon elastomer can be self-repaired in various environments through the synergistic effect of various dynamic covalent bonds, and the polymerization efficiency is remarkably improved.

The invention provides a preparation method of a self-repairing resin-based composite material based on dynamic bonds. The self-repairing epoxy resin comprises one covalent dynamic bond of a Diels-Alder bond, a disulfide bond or a borate bond, and the preparation method of the self-repairing epoxy resin comprises the following steps: heating epoxy resin to a molten state, adding a curing agent component while stirring, and carrying out a prepolymerization reaction to obtain a prepolymer; the curing agent comprises a rigid diamine curing agent, a dynamic diamine monomer and a flexible chain segment regulator, and the dynamic diamine monomer contains a dynamic covalent bond; and carrying out curing molding on the prepolymer to obtain the self-repairing epoxy resin. And impregnating reinforced fibers or fabrics thereof with the prepared prepolymer, and heating and curing to obtain the self-repairing resin-based composite material. The invention provides a chemical molecule design, dynamic reversible chemical bonds are introduced into a resin matrix, and by constructing the dynamic bonds, the composite material has high performance of a traditional composite material and also has life-like self-healing ability.

The invention relates to the technical field of batteries, and particularly discloses a current collector, a method for preparing the current collector, a pole piece, a lithium ion battery and a power utilization device.The current collector comprises a base material and a conductive coating arranged on at least one side of the base material, and physical crosslinking points are evenly distributed in the conductive coating; the physical cross-linking points are non-covalent bond connecting points and comprise coordinate bonds between the binder and metal ions and / or hydrogen bonds between the binder and the polyhydroxy compound. The physical cross-linking points can effectively improve the adaptability of the conductive coating to the expansion and shrinkage stress of the active material layer in the long-term circulation process, the physical cross-linking points can be self-generated again after being damaged, the cross-linking structure improves the adhesion strength of the conductive coating to the current collector, meanwhile, the conductive coating has excellent fatigue resistance, and the service life of the conductive coating is prolonged. After long-term circulation, the high cohesiveness is still kept, and the phenomena of interface separation and active substance powder falling are not prone to occurring.