29results about How to "Good thermal properties" patented technology

The invention discloses a device for realizing low-loss work of a long-wave infrared femtosecond optical parametric oscillator, which belongs to the field of optical parametric oscillators and comprises a pumping source, a pumping focusing lens, a long-wave infrared nonlinear crystal cut at a Brewster angle, a laser medium dichroscope and an output coupling mirror. Wherein the nonlinear crystal meets the I-type phase matching condition for the optical parameter process, and the front and rear surfaces of the crystal cut the central wavelength of the oscillated signal pulse at a Brewster angle so as to reduce the loss of the pulse in the resonant cavity. According to the long-wave infrared femtosecond optical parametric oscillator, the limitation of residual loss of a crystal antireflection film is broken through by adopting Brewster angle cutting on the crystal, so that the construction of the femtosecond optical parametric oscillator based on the long-wave infrared nonlinear crystal becomes possible, and the bottleneck of the existing long-wave infrared femtosecond optical parametric oscillator in the aspects of wavelength tuning range, output power and the like is expected to be broken through; and a practical low-cost technical scheme is provided for construction and application of the long-wave infrared femtosecond optical parametric oscillator.

The invention discloses a PPR antibacterial pipe based on a graphene oxide / nano-silver composite material, and relates to the technical field of antibacterial plastics, the PPR antibacterial pipe is prepared from the following raw materials by weight: 80-100 parts of PPR resin, 1-10 parts of a toughening agent, 0.5-5 parts of a graphene oxide / nano-silver composite material, 0.5-5 parts of a plasticizer, 0.5-5 parts of a compatilizer, 0.5-5 parts of a coupling agent, 0.1-1 part of a light stabilizer, and 0.1-1 part of an antioxidant; the comprehensive performance of the PPR antibacterial pipe is improved by adding the graphene oxide / nano-silver composite material, so that the PPR antibacterial pipe has a wide application range.

The invention discloses a preparation method and application of a flame-retardant conductive aramid fabric, and belongs to the field of functional textiles, the preparation method comprises the following steps: 1) dipping an aramid fabric base material in a solvent to remove oil, and then washing and drying; 2) adding a dopant A, a dopant B and the fabric obtained in the step 1) into a conductive polymer monomer solution, dropwise adding an oxidant solution, reacting at low temperature, washing and drying; and 3) mixing the PDMS main agent, the PDMS curing agent, the diluent and the flame retardant in proportion, immersing the fabric prepared in the step 2) into the mixed solution, stirring at room temperature, and curing at high temperature to obtain the flame-retardant conductive aramid fabric. The flame-retardant conductive aramid fiber fabric prepared by the invention has good conductive and flame-retardant properties, and high-temperature alarm can be realized when the flame-retardant conductive aramid fiber fabric is connected into an alarm circuit.

The present invention discloses a low-brittle glass substrate and a preparation process thereof, belonging to the field of glass substrate preparation. The raw material components of the glass substrate include base silicon dioxide, surface amino-treated silicon dioxide, aluminum oxide, boron oxide, modified titanium dioxide, sodium oxide, magnesium oxide, and cerium oxide. The glass substrate of the present invention has low brittleness, and the ratio of Vickers hardness to fracture toughness is used as a brittleness index, the Vickers hardness is 6.65-6.70GPa, and the fracture toughness is 3.54-3.77MPa / m 1 / 2 , the brittleness index is 1.78-1.87.

The invention provides ionic liquid grafting modified high-temperature-resistant bio-based nylon as well as a preparation method and application thereof, and belongs to the technical field of bio-based high polymer materials. After nylon 5T salt is subjected to prepolymerization reaction, imidazolium ionic liquid is added for final polymerization, and the ionic liquid grafting modified high-temperature-resistant bio-based nylon is obtained. In the polymerization process, the imidazole ionic liquid enters a polyamide macromolecular chain, so that the intermolecular acting force can be reduced, and the molecular chain spacing can be increased, thereby reducing the melting point of the bio-based nylon, increasing the flowability of the bio-based nylon and improving the thermal property, crystallization and other behaviors of the bio-based nylon; the processing stability and the spinning performance of the bio-based nylon in the later period are effectively improved, meanwhile, the energy consumption is reduced, and the bio-based nylon with high strength, high orientation and high crystallization is obtained.

The invention provides a diamond thick film and a preparation method thereof, and the preparation method comprises the following steps: (1) electrifying and heating the surface of a substrate by using a hot filament, introducing a methane and hydrogen mixed gas with the methane volume content of 2-8%, and depositing diamond on the surface of the substrate; (2) after the single deposition thickness of the diamond reaches 50-150 microns, stopping introducing the methane, and maintaining for 0.5-20 hours in a hydrogen atmosphere; (3) introducing a methane and hydrogen mixed gas with the methane volume content of 2-8%, and continuously depositing the diamond; (4) after the single deposition thickness of the diamond reaches 50-150 microns, stopping introducing the methane, and maintaining for 0.5-20 hours in the hydrogen atmosphere; and (5) according to the required thickness of the diamond thick film, the step (3) and the step (4) are repeated, the diamond thick film is obtained, and the thickness is 600-2500 microns. According to the method, the diamond phase content in the diamond thick film is increased, and the mechanical and thermal properties of the diamond thick film are improved.

The invention relates to a heat input end gradient foam metal enhanced axial oscillation heat pipe grinding wheel and a preparation method thereof. The grinding wheel mainly comprises a base body, a cover plate, a cutter bar, a working medium, an abrasive layer and gradient foam metal. The matrix is optimally designed and manufactured by combining a lattice structure and a 3D printing technology, and gradient foam metal is embedded in the position, corresponding to a heat input end, of an oscillating heat pipe runner. The aperture and porosity of the gradient foam metal are gradually increased from the flow channel wall face to the flow channel center direction, the hydrophilicity is gradually weakened, and a hollow horn-shaped structure with the material thickness gradually increased vertically downwards along the axis of the grinding wheel is formed. In the grinding process, due to the porous structure characteristic of the gradient foam metal in the grinding wheel, the vaporization core density in a flow channel is increased, meanwhile, bubble separation in the nucleate boiling process is accelerated, phase change heat transfer in a pipe is promoted, and the local dry-out phenomenon is effectively avoided. The grinding wheel structure can remarkably improve the heat dredging capacity and the working stability.

The invention discloses a [2.1. 1] bridged ring lactone monomer, recyclable polyester and a preparation method of the [2.1. 1] bridged ring lactone monomer. A [2.1. 1] bridged ring lactone monomer as shown in a formula (I) and a metal catalyst are subjected to a ring-opening polymerization reaction in an organic solvent to generate the recyclable polyester with a main chain containing a four-membered ring as shown in a formula (II). The monomer shown in the formula (I) and other lactone monomers are subjected to ring-opening copolymerization, and a recoverable random copolymer or block copolymer can be prepared. The polyester compound prepared by the invention has the characteristics of high molecular weight and narrow dispersity, has excellent thermal properties, mechanical properties, hydrolysis-resistant stability and chemical degradability, and is a polyester material with high polymerization activity, high recoverability and high performance; and the product is expected to become a substitute of non-degradable commercial plastic low-density polyethylene and polystyrene at present. # imgabs0 #

The invention relates to the technical field of polymer composite material processing, and discloses a polyphenyl ether modified EVA (Ethylene Vinyl Acetate) hot melt adhesive and a preparation method thereof. The hot melt adhesive is prepared from the following components in parts by weight: 35 to 50 parts of EVA (Ethylene Vinyl Acetate) resin, 5 to 20 parts of polyphenyl ether, 30 to 60 parts of tackifying resin, 5 to 20 parts of wax and 0.4 to 0.8 part of composite antioxidant. EVA and PPE in a specific ratio are selected as base materials (wherein EVA is the main base material), and a proper amount of tackifying resin is added into the system to modify the EVA hot melt adhesive, so that the melt viscosity of the system is reduced, the cohesion of the hot melt adhesive and the wettability of the hot melt adhesive on a bonding interface are improved, the bonding strength is enhanced, and the performance is further improved; the tackifying resin is low in volatile matter, and the softening point of the tackifying resin is higher than that of EVA resin, so that the softening point of the hot melt adhesive can be further improved, and the low-temperature resistance, mechanical property and ageing resistance of the hot melt adhesive are improved.

The invention discloses a preparation method of a graphene copper-based composite material, and belongs to the technical field of copper-based composite materials. The method comprises the following steps: (1) carrying out surface pretreatment on a copper foil; (2) dropwise adding the graphene dispersion liquid on the surface of the copper foil, and drying the copper foil after the graphene dispersion liquid is freely diffused until the graphene dispersion liquid covers the surface of the copper foil; (3) stacking the copper foils in a manner that a graphene layer is arranged between two layers of copper foils, and then sequentially carrying out cold pressing and hot pressing to obtain a hot-pressed composite material; (4) annealing the hot-pressed composite material to obtain an annealed composite material; (5) carrying out cold rolling on the annealed composite material to obtain a rolled composite material; and (6) the rolled composite material is subjected to annealing treatment, and the graphene copper-based composite material is obtained. On the basis of simplifying the preparation process and reducing the preparation demand conditions, the graphene is promoted to effectively and fully exert the strengthening effect, and the comprehensive performance of the composite material in multiple aspects is improved.

The invention relates to a J-R type silicon carbide electrostatic chuck and a preparation method thereof. The preparation method of the J-R type silicon carbide electrostatic chuck comprises the following steps: (1) printing an electrode layer on a ceramic substrate of the electrostatic chuck to obtain a substrate-electrode layer structure; and (2) connecting a SiC single crystal J-R layer to one side of the electrode layer of the substrate-electrode layer structure, and performing hot pressing and co-firing to obtain the J-R type silicon carbide electrostatic chuck.

The invention discloses a BPA-PC degradation method and application of the BPA-PC degradation method in preparation of epoxy thermosetting resin, and belongs to the technical field of polymer composite material depolymerization and recycling. According to the method, degradation of BPA-PC and synthesis of epoxy thermosetting resin are coupled, efficient upgrading and recycling of BPA-PC plastic are achieved, and a new way is developed for chemical recycling of waste plastic. According to the invention, diphenyl carbonate is used as a depolymerization reagent to realize depolymerization of BPA-PC, and the obtained depolymerization product is directly used as a curing agent of epoxy resin without separation and purification to prepare high-performance and recoverable epoxy thermosetting resin. The process does not involve excessive reaction reagents, and a depolymerization product can be directly reused, so that 100% of atom utilization rate is realized. In addition, the prepared epoxy thermosetting resin has good comprehensive performance such as mechanical performance, thermal performance and dynamic performance, meanwhile, carbonic ester bonds are reserved in the structure of the epoxy thermosetting resin, and chemical circulation can be achieved.

The invention relates to a high-barrier-property high-density polyethylene modified composite material and a preparation method thereof, a blend uses HDPE as a matrix, the content of PA6 accounts for 10%-15%, and the content of PE-g-MAH accounts for 10%-15% by weight. The materials are prepared through a double-screw extruder, the temperature, the rotating speed and the vacuum degree in the preparation process are set, and the temperature setting specifically comprises the steps that the temperature of a first area of the temperature of a discharging opening is controlled to range from 180 DEG C to 200 DEG C; the second area to the sixth area are plasticizing sections, and the temperature of the plasticizing sections is controlled to be 230-240 DEG C; the seventh area to the tenth area are shearing sections, and the temperature of the shearing sections is controlled to be 220-230 DEG C. And the rotating speed is set to be 60-70% of the upper rotating speed limit of the experiment machine. The HDPE / PA6 / PE-g-MAH blend prepared by the method provided by the invention has good mechanical properties, thermal properties and gas barrier properties. Specifically, the tensile strength is 18MPa, the elongation at break is 494%, the thermal deformation temperature is 45.9 DEG C, and the helium permeability coefficient is 1.44 * 10 <-13 > cm < 3 >. Cm / cm < 2 >. Pa.s. The modified material has good gas barrier property, and promotes the development of HDPE in the field of IV type gas cylinder research.

The invention relates to a breakdown-resistant and aging-resistant power cable. A power cable has high anti-breakdown and anti-aging requirements, however, cable materials used at present, such as polyethylene, are poor in anti-aging capability. In order to solve the problem, the breakdown-resistant and aging-resistant power cable is invented, the breakdown-resistant and aging-resistant power cable is sequentially composed of a conductor, a conductor shielding layer, an insulating layer, a wrapping layer and a protective layer from inside to outside, and the conductor shielding layer is a composite shielding material composed of organic silicon, graphene and nano molybdenum dioxide. The organic silicon in the conductor shielding layer has good heat resistance and aging resistance; the graphene has good electric conduction and heat conduction performance, can shield electromagnetic waves, and can conduct heat out to reduce the temperature; the nano molybdenum dioxide can react with peroxide at high temperature, so that the degradation effect of the organic silicon resin is delayed, and the aging resistance of the cable can be effectively improved by combining the nano molybdenum dioxide, the peroxide and the organic silicon resin. The breakdown-resistant and aging-resistant power cable can be used in the fields of high-voltage power cables and the like.

The application relates to the field of high polymer alloy material modification, in particular to a polyaryletherketone alloy material and a preparation method thereof. The polyaryletherketone alloy material specifically comprises, in parts by weight, 97.10-99.10 parts of polyaryletherketone base resin, 0.01-2.00 parts of transparent nucleating agent, and the rest parts of auxiliary agent. The polyaryletherketone alloy material has good transparency under the precondition that the mechanical properties, mechanical properties and high-temperature thermal stability of the polyaryletherketone alloy material are not sacrificed, so that the polyaryletherketone alloy material meets the application of optical transparent products.

The invention relates to the technical field of shield tunnel construction materials, and discloses slurry for shortening the freezing time of a T joint in a shield method contact channel, and the slurry comprises graphene nanosheet powder, silicon carbide, lime, fine sand, fly ash, bentonite, a thickening agent and a water reducing agent by mass, the ratio of the graphene nanosheet powder to the silicon carbide to the lime to the fine sand to the fly ash to the bentonite to the thickening agent to the water reducing agent is (0.5%-3%): (1%-10%): (2%-8%): (40%-50%): (15%-25%): (2%-6%): (0.05%-0.2%): (0.02%-1%), and the balance is water. The slurry disclosed by the invention not only has relatively high thermal conductivity and can shorten the freezing time of a soil body around the T joint of the shield method contact channel, but also has relatively high strength after being solidified.

The invention relates to a high-temperature colorless shape memory polyimide film as well as a preparation method and application thereof. The structural formula of the high-temperature colorless shape memory polyimide film is as follows: different types of diamine monomers containing trifluoromethyl structures, dianhydride monomers containing hexafluoroisopropyl structures and flexible ether bond dianhydride monomers are copolymerized to prepare the high-temperature colorless shape memory polyimide film. The mole number ratio of the dianhydride monomer to the diamine monomer is 1: (0.92-0.95). The shape memory polyimide film prepared by the invention has good optical and thermal properties, and also ensures the shape memory property. The preparation method is simple, few in technological process and low in production cost.

The invention discloses a low-brittleness glass substrate and a preparation process thereof, and belongs to the field of glass substrate preparation. The glass substrate is prepared from the following raw material components: matrix silicon dioxide, surface amino-treated silicon dioxide, aluminum oxide, boric oxide, modified titanium dioxide, sodium oxide, magnesium oxide and cerium oxide. The glass substrate has low brittleness, the ratio of the Vickers hardness to the fracture toughness is taken as the brittleness index, the Vickers hardness is 6.65-6.70 GPa, the fracture toughness is 3.54-3.77 MPa / m < 1 / 2 >, and the brittleness index is 1.78-1.87.

The invention discloses a microcrystalline glass substrate with metalized through holes and a preparation method of the microcrystalline glass substrate, and belongs to the field of electronic device adapter plate manufacturing. The substrate comprises a microcrystal glass plate base material and a through hole vertically penetrating through the upper and lower planes of the microcrystal glass plate base material, and a metalized conductive structure is formed in the through hole. The preparation method comprises the following steps: performing irradiation modification on a selected area of a microcrystalline glass thin plate by adopting CO2 pulse laser to convert microcrystals in the thin plate into an amorphous phase, and then selectively and efficiently etching a laser modified columnar area in a corrosive liquid to form a through hole; the inner wall of the through hole is activated by SnCl2 in the later period, chemical nickel plating is conducted, annealing is conducted to form a seed layer so that the through hole can be filled through electro-coppering, and finally chemical mechanical polishing is used for removing metal on the surface of the microcrystal thin plate to complete preparation. According to the invention, the problem of processing the through hole of the microcrystalline glass is solved, and meanwhile, the palladium-free activation process is adopted, so that the cost is remarkably reduced, and an ideal substrate solution is provided for electronic packaging with high performance, high reliability and high cost performance.

The present application relates to controllable preparation of nanocarbon composite material, and particularly to a method for preparing a welded carbon nanotube@hexagonal boron nitride coaxial heterostructure. A carbon nanotube network is used as a template, and the volatilization amount of boron and nitrogen precursors is controlled during a normal pressure chemical vapor deposition process, so that an amorphous boron nitride welding structure is first grown at the network lap joint, and then hexagonal boron nitride is grown on the surface of the carbon nanotube and the amorphous welding structure, to obtain a welded carbon nanotube@hexagonal boron nitride coaxial hetero-network structure. By changing the volatilization temperature of the boron and nitrogen precursors and the chemical vapor deposition conditions, the microstructure (crystallinity, layer number, curling degree, etc.) of the amorphous welding structure and the coated hexagonal boron nitride is regulated. The welded coated structure can be directly used to construct a film, a fiber, a sponge and other macroscopic bodies, the welding structure at the lap joint in the network can enhance the binding force between carbon nanotube bundles, improve the mechanical properties of the film, and reduce the phonon scattering at the contact, thereby enhancing the heat conduction capacity of the network.

The invention discloses a high temperature resistant ceramic body material and a preparation method thereof, belonging to the technical field of ceramic production. First, the high temperature resistant ceramic body material comprises the following raw materials by weight: 30-40 parts of calcined kaolin, 20-25 parts of quartz, 15-20 parts of dolomite, 12-15 parts of zirconium boride, 10-12 parts of aluminum carbon silicide, 8-10 parts of binder and 5-8 parts of magnesium aluminum spinel. Then, the preparation method comprises the following steps: mixing the above raw materials and placing them in a ball mill to obtain a body slurry, drying the body slurry to a water content of 1% to 3%, and obtaining a high temperature resistant ceramic body material. The ceramic body material of the invention is composed of calcined kaolin, quartz, aluminum carbon silicide, dolomite, magnesium aluminum spinel, zirconium boride and a binder. The invention strictly controls the composition and dosage of the raw materials, and after testing, the ceramic body material finally prepared has excellent performance of high temperature resistant body deformation.

The invention discloses an identification method for batch processing of pore parameters in a magnesium phosphate cement cementing material image based on software imagej, and relates to the field of magnesium phosphate cement microstructure image identification, in particular to an identification method for batch processing of pore parameters in a magnesium phosphate cement cementing material image based on software imagej. The invention aims to solve the technical problems that the SEM image data volume of MPC is large, and the actual demand is difficult to meet by purely depending on manual analysis. According to the method, image recognition of the pore parameters of the magnesium phosphate cement cementing materials in batches is realized by utilizing ImageJ software, and the processing efficiency is greatly improved. According to the method, subjectivity and errors of manual judgment in a traditional method are avoided, an image processing technology and a machine learning algorithm are combined, and a new thought and method are provided for analysis of the pore structure of the porous material. With continuous development of the technology, the method is expected to be applied and popularized in more fields, and innovation and development of related technologies are promoted.

The invention discloses a self-repairing acrylate photosensitive resin for 3D printing and a manufacturing method thereof, the self-repairing acrylate photosensitive resin comprises filler nanocellulose and polymer matrix acrylate, the nanocellulose has rich surface hydroxyl and a nano-sized structure, and the polymer matrix acrylate is a polymer matrix acrylate. The self-repairing performance of the self-repairing acrylate photosensitive resin is endowed on the basis of an interface hydrogen bond network between a hydroxyl group on the surface of the nanocellulose and a hydroxyl group at the end of an acrylate molecular chain. The self-repairing acrylate photosensitive resin can be printed and formed by using DLP-3D printing equipment. The problems of microcracks, scratches, cracks and the like inevitably generated in the use process of the 3D printing elastomer due to external force are solved, and the 3D printing elastomer has the characteristics that the raw materials are derived from biomass, the 3D printing elastomer is green and environment-friendly, the preparation process is simple, and the 3D printing elastomer has self-repairing capability and relatively good mechanical property and self-repairing performance.

The invention discloses a Fabry-Perot triaxial accelerometer based on optical fiber bending. The Fabry-Perot triaxial accelerometer comprises a diaphragm, a diaphragm bracket, a ceramic ferrule, a metal center shaft, a metal shell and a 1 * 3 optical fiber coupler, the metal middle shaft part is provided with three embedded holes for placing the diaphragm supports, the three metal supports with the diaphragms are placed in the embedded holes, and the designed diaphragm placing direction angle is 120 degrees, so that the loss caused by optical fiber macro bending is reduced. And meanwhile, the optical fiber combining groove is designed, so that three paths of optical fibers in different directions can be combined in one direction through bending. The accelerometer is fixed on the surface of a measured object, when the diaphragms in three different directions vibrate, three relative cavity lengths can be changed, three peaks of a Fabry-Perot interference spectrum are demodulated, and the accelerations of the measured object in three directions can be measured. The diaphragm accelerometer has a wide application range, and the sensitivity and the working frequency band range can be adjusted by adjusting the parameters of the single diaphragm accelerometer.

The invention relates to the technical field of aluminum-based composite materials, in particular to a phase change energy storage-heat conduction synergistic aluminum-based composite material and a preparation method of the phase change energy storage-heat conduction synergistic aluminum-based composite material. 8-20 parts of a phase change energy storage material; 2-5 parts of a heat conduction reinforcing agent; 0.5 to 2 parts of a carbon nano tube; 0.2 to 1 part of an interface coupling agent; the carbon nanotubes and the aluminum nitride powder are introduced as heat-conducting fillers, so that a multi-stage heat-conducting network with the scale from nanometer to micrometer is constructed. The carbon nano tube forms a nano-scale heat conduction channel by virtue of the high length-diameter ratio and excellent axial heat conduction performance of the carbon nano tube. And the micron-sized aluminum nitride powder fills gaps among the carbon nanotubes, so that the continuity and the effectiveness of the heat-conducting network are further improved. According to the multi-scale structural design, the overall heat-conducting property of the composite material is remarkably improved, and meanwhile, the mechanical property of the material is accidentally enhanced.

The application provides a high-frequency transformer functional insulating material of plasmonic orientation boron nitride and a preparation method and application thereof, and relates to the technical field of insulating materials. The functional insulating material is obtained by sequentially covering, from an inner layer to an outer layer, a thermosetting resin matrix layer, a silicon-rich transition layer, an oriented boron nitride sheet layer, a boron nitride gradient insulating layer and a densified surface layer on the surface of a metal conductor. The insulating material can realize heat diffusion enhancement, electric field distribution homogenization and space charge inhibition, and exhibits high breakdown strength, high local discharge starting voltage and good long-term insulating stability under high-frequency non-sinusoidal voltage, and is suitable for insulating reinforcement of the winding end, the outgoing line end and the core clamping piece area of a high-frequency transformer of a super-speed train, and has a good application prospect.

The invention discloses a method for preparing a highly transparent high-borosilicate glass, and belongs to the field of high-borosilicate glass manufacturing. The preparation method comprises preparing rare earth chloride treated silicon dioxide by an aerogel method, preparing phosphorus modified lithium oxide flux, and preparing glass by a float method. The high-borosilicate glass prepared by the invention has excellent optical properties, not only has high light transmittance, but also does not undergo optical deformation at a larger incident angle, with a visible light transmittance of 98.5-98.8%, a total solar energy transmittance of 98.7-99.2%, and an incident angle of 157-165° when the glass undergoes optical deformation at a distance of 4.5 m.

The application relates to a UTG-based solar cell substrate and a solar cell. The UTG-based solar cell substrate comprises a connecting layer, a first UTG substrate layer, a growth substrate layer and an epitaxial growth layer. The connecting layer is arranged on one side of the first UTG substrate layer. The growth substrate layer is arranged on the side, away from the connecting layer, of the first UTG substrate layer. The growth substrate layer comprises at least one of a copper layer, an iridium layer, a hexagonal boron nitride layer and a silicon carbide layer, and the epitaxial growth layer comprises a graphene layer arranged on the side, away from the first UTG substrate layer, of the growth substrate layer. The UTG substrate layer has excellent characteristics such as high light transmittance, high barrier property, atomic oxygen resistance, radiation resistance and bendability. The growth substrate layer has good heat conduction performance. The graphene layer can be epitaxially grown on the growth substrate layer easily, and the graphene layer has high infrared emission performance and high conductivity, can realize passive and efficient heat dissipation, avoid accumulation of static electricity, and prevent the internal circuit of the battery from being broken.

The invention provides a lignin-based epoxy resin curing agent and a preparation method and application thereof, and the preparation method comprises the following steps: mixing lignin, an alkaline solution and an amine reagent to obtain a mixed solution; the mixed solution is heated to 60-90 DEG C, formaldehyde is added for a Mannich reaction, the reaction time is 2.5-4 h, and the lignin-based epoxy resin curing agent is obtained; the mass ratio of the lignin to the amine reagent is 1: (0.2-0.35), and the mass ratio of the lignin to the formaldehyde is 1: (0.6-1.2). The preparation method provided by the invention is simple to operate, the prepared lignin-based epoxy resin curing agent and epoxy resin can be rapidly cured at low temperature, the cured product has good performance, and the lignin-based epoxy resin curing agent has a wider application range.