29 results about "Diaminodiphenyl ether" patented technology

This invention discloses an MPP pipe for power cables and its preparation method, relating to the field of polymer materials technology. The invention comprises, by weight, 80-90 parts of a toughening nucleating agent; 40-45 parts of an insulating nucleating agent obtained by in-situ composite and gradient temperature imidization treatment of a polyamic acid prepolymer prepared from hexagonal boron nitride nanosheets (prepared by surface modification with dopamine hydrochloride, followed by modification with octyltriethoxysilane) to obtain a silanized boron nitride suspension; 40-45 parts of melamine cyanurate; 2.1-2.4 parts of an antioxidant; 2.6-3 parts of a light stabilizer; 8-9 parts of a lubricant; and 1340-1500 parts of polypropylene. The introduction of the toughening nucleating agent and insulating nucleating agent in this invention effectively improves the flame retardancy, low-temperature rigidity-toughness balance, and aging resistance of the MPP pipe.

The present invention provides a polyimide film comprising, as polymeric units, dianhydride monomers comprising pyromellitic dianhydride (PMDA), and diamine monomers comprising 4,4'-methylenedianiline (MDA), meta-phenylenediamine (MPD), 4,4'-diaminodiphenyl ether (ODA), and para-phenylenediamine (PPD), the tensile strength and percent elongation of the polyimide film being 180 MPa or greater and 90% or greater, respectively.

The application discloses a kind of drying device of diaminodiphenyl ether, belong to chemical production technical field, by moving gear in the center of carousel can revolve while rotating, moving gear is rotated by deflection shaft and is guided to the opening at the bottom of feed hopper Multiple material pieces, diaminodiphenyl ether material inside feed hopper can be uniformly guided in the process of rotation and make it fall into drying box, in the process of discharging, because discharge hopper revolves around the center of drying box, so that material piece can uniformly guide material into drying box from multiple directions, cooperate microwave heater and work, microwave can directly penetrate diaminodiphenyl ether material, so that water molecule inside material rapidly vibrates and generates heat, realize inside and outside heating simultaneously, by uniformly feeding to multiple directions inside drying box and carrying out microwave heating, prevent diaminodiphenyl ether material from appearing agglomeration phenomenon, improve heat transfer efficiency and drying effect.

This invention discloses a fire-retardant battery separator, its preparation method, and a fire-retardant battery, relating to the field of battery separator technology. In preparing the fire-retardant battery separator, this invention involves reacting a mixture of diglyceride borate and trimellitic anhydride chloride to obtain a flame-retardant monomer; polymerizing 4,4'-diaminodiphenyl ether and the flame-retardant monomer, followed by electrostatic spraying to obtain polyamic acid microspheres; dehydrating and drying the polyamic acid microspheres to obtain polyimide microspheres; etching and acidifying the polyimide microspheres to obtain carboxylated polyimide microspheres; grafting propylene-based phosphoric acid and acrylic acid copolymers onto the surface of a polyethylene film to obtain a modified polyethylene film; and coating the carboxylated polyimide microspheres onto the surface of the modified polyethylene film to obtain the fire-retardant battery separator. The fire-retardant battery separator prepared by this invention exhibits excellent flame retardancy, wetting, and thermal stability.

This invention discloses polyimide, its preparation method, and polyester electronic adhesive. This invention provides a polyimide whose polymerizing monomers include dianhydride monomers and diamine monomers, wherein the dianhydride monomer is selected from one or more of 4,4'-(4,4'-isopropyldiphenoxy)bis(phthalic anhydride), 3,3',4,4'-benzophenone tetracarboxylic dianhydride, 4,4'-oxybis(phthalic anhydride), and 2,3,3',4'-biphenyltetracarboxylic dianhydride; and the diamine monomer is selected from one or more of aminophenyl sulfone, 1,3-bis(4'-aminophenoxy)benzene, 2,2'-bis[4-(4-aminophenoxyphenyl)]propane, 4,4'-bis(3-aminophenoxy)diphenyl sulfone, 1,3-cyclohexanedimethylamine, 4,4'-diaminodiphenyl ether, dimericadiamine, and trimericadiamine. The polyimide of this invention can modify polyester or epoxy systems, significantly improving flame retardancy and adhesive peel strength. The coating process involves evaporation at relatively low temperatures, and the solvent in the system has a low boiling point, meeting the requirements of existing processes.

The application discloses a kind of reinforced toughened impact resistant wear-resistant anticorrosion integrated coating material and preparation method thereof, it is related to high polymer composite material and functional coating technical field, method includes: providing hexafluorocyclotriphosphazene and vanillin, mixing, carries out first reaction, obtains first reactant;Providing 4,4'-diamino diphenyl ether and 3,3',4,4'-benzophenone tetracarboxylic dianhydride, mixing, carries out second reaction, obtains second reactant;Providing hydroxyl-terminated polydimethylsiloxane and 4,4'-diphenyl methane diisocyanate, with second reactant is mixed, carries out third reaction, obtains third reactant;Providing iron salt, with first reactant and third reactant are mixed, carries out solidification treatment, obtains coating material;The reinforced toughened impact resistant wear-resistant anticorrosion integrated coating material obtained will be integrated in single layer coating with the functions such as reinforcement, toughening, impact resistance, wear resistance, corrosion resistance, etc., with excellent wear resistance and anticorrosion performance and intrinsic flame-retardant radiation resistance characteristics.

This invention proposes a polyimide film, its preparation method, and its applications, relating to the field of thin film materials. By weight, it comprises the following raw materials: 50-100 parts dimethylformamide, 5-10 parts diaminodiphenyl ether, 10-20 parts phenylenediamine, 1-2 parts core-shell structured silica-alumina particles, 25-30 parts pyromellitic dianhydride, 1-2 parts organically modified montmorillonite, 1-2 parts aminated thermally conductive particles, 50-100 parts acetic anhydride, and 5-10 parts pyridine; wherein the core-shell structured silica-alumina particles are a composite material with polydopamine as the shell and nano-silica and nano-alumina as the core; the organically modified montmorillonite is obtained by intercalation modification of montmorillonite with an organic compound containing hydroxyl groups; the aminated thermally conductive particles are obtained by graft modification of nitrides with an organic compound containing amino groups. It exhibits good high-temperature resistance, high-pressure breakdown resistance, and thermal conductivity, as well as high mechanical strength and long service life.

The present application relates to the technical field of high polymer materials, and particularly relates to a preparation method of wear-resistant / low-dielectric PTFE composite material based on interface functionalization. Ammonia / hydrogen mixed gas is used to perform low-temperature plasma treatment on PTFE powder; then the activated PTFE powder is dispersed in an aqueous solution containing ammonium perfluorooctanoate and 4-dimethylamino pyridine; then an organic phase of pyromellitic acid dichloride and an aqueous phase of 4,4'-diamino diphenyl ether are synchronously added dropwise to implement in-situ interface polymerization on the surface of PTFE particles to generate a polyamide acid ammonium salt coating layer; finally, through programmed temperature rising, the coating layer is converted into polyimide, and under the action of hot pressing, a composite material with PTFE as a matrix and a three-dimensional network of polyimide nanofibers penetrating through the inside is formed. The interface bonding force between the reinforcing phase and the PTFE matrix is significantly enhanced, so that the composite material simultaneously has excellent wear resistance, low dielectric constant, high mechanical strength and thermal stability.

This invention relates to a polyimide material and its preparation method, belonging to the field of polymer materials technology. The invention uses a macromolecular diamine monomer containing PEG segments and 4,4'-diaminodiphenyl ether as a compounded diamine monomer, reacting it with a dianhydride monomer compounded with 3,3',4,4'-diphenyl ether tetracarboxylic dianhydride and 3,3',4,4'-biphenyl tetracarboxylic dianhydride to prepare a polyimide with carboxyl groups in its side chains. Then, the polyimide with carboxyl groups in its side chains is grafted with a photosensitive compound to prepare a photosensitive polyimide material. The PEG-based macromolecular diamine provides excellent solubility, film-forming properties, and low-temperature flexibility; the rigid aromatic diamine improves mechanical strength, thermal stability, and pattern fidelity; the ether-bonded ODPA ensures solubility and uniform crosslinking; and the biphenyl-type BPDA increases modulus, reduces water absorption, and improves resolution.

The polyamic acid is a reaction product of an acid dianhydride component and a diamine component. The acid dianhydride component includes biphenyltetracarboxylic dianhydride. In addition, the diamine component does not include a fluorine atom and a diamino diphenyl ether, and includes 4-aminophenyl 4-aminobenzoate.

The application discloses a preparation method of rapidly vulcanized mixed and kneaded silicone rubber and belongs to the technical field of silicone rubber preparation. The method comprises four steps of raw material pretreatment, basic kneading, vulcanization system kneading and vulcanization forming. Raw materials are proportioned according to specific weight parts, 4,4'-diamino diphenyl ether and 3,3'-dimethyl-4,4'-diamino dicyclohexyl methane are compounded as vulcanization accelerators, cooperate with platinum catalysts, and combined with step-by-step kneading process to realize rapid vulcanization of mixed and kneaded silicone rubber. The vulcanization time is shortened to 3-8 min, the vulcanization temperature is reduced to 120-140 DEG C, the vulcanization efficiency is increased by more than 60%, meanwhile, the hardness of the silicone rubber after vulcanization is 50-70 Shore A, the tensile strength is greater than or equal to 3.5 MPa, the elongation at break is greater than or equal to 300%, and the comprehensive performance is excellent. The preparation process is simple, raw materials are cheap and easy to obtain, and the cost is controllable. No special equipment is needed, and the method is easy to realize industrial large-scale production and is suitable for multiple fields such as electronics, automobiles and buildings.

This invention relates to the field of battery slurry technology, and more particularly to a silicon-carbon aqueous composite binder slurry and its preparation method. The raw materials for preparing the silicon-carbon aqueous composite binder slurry provided by this invention, by weight, include 2-3.5 parts PI, 1.5-2.5 parts modified PAA, 80-100 parts silicon-carbon anode, 0.5-1 parts conductive carbon black, and 1-2 parts carbon nanotubes; wherein the raw materials for preparing PI include pyromellitic dianhydride, diaminodiphenyl ether, and NMP; and the raw materials for preparing modified PAA include acrylamide, methyl methacrylate, acrylonitrile, and acrylic acid. The slurry prepared by this invention achieves a peel strength of 11.69-12.85 N / m when coated on electrodes, a capacity retention rate of 94.1%-97.3% after 100 cycles, an expansion rate of 14.9%-18.7%, and an internal resistance of 14.8-15.2 mΩ, exhibiting excellent comprehensive performance and suitable for the industrial production of high-energy-density lithium-ion batteries.

This invention relates to a method for preparing an aerogel-confined n-octadecane phase change thermal storage composite material. The invention uses 4,4′-diaminodiphenyl ether and pyromellitic dianhydride to form a polyamic acid precursor solution, and a bacterial cellulose dispersion to construct a support network. A pre-hydrolyzed siloxane precursor solution is introduced into the polyamic acid / bacterial cellulose wet system for in-situ co-condensation and aging to form a polyamic acid / bacterial cellulose / silica wet cogel. This cogel is then subjected to solvent displacement, directional freezing, freeze-drying, and graded thermal imidization to obtain a polyimide / bacterial cellulose / silica ternary hybrid aerogel framework. The aerogel framework is pre-degassed, and molten n-octadecane is introduced into the pores. After cooling and annealing, the phase change thermal storage composite material is obtained. This invention improves the effective filling and confinement retention of n-octadecane through wet silica cogel, solvent displacement to maintain pore accessibility, graded thermal imidization to stabilize pore walls, and pulsed impregnation.

This invention provides a polyimide precursor comprising: polyamic acid, the polyamic acid comprising a dianhydride monomer and a diamine monomer as polymerization units; and an environmentally friendly solvent, wherein the diamine monomer comprises a first diamine monomer and a second diamine monomer, the first diamine monomer and the second diamine monomer being different from each other, the second diamine monomer comprising 3,4'-diaminodiphenyl ether (3,4'-ODA), and based on 100 mol% of the total diamine monomers, the diamine monomer comprises a first diamine monomer in an amount of 80 mol% to 99.9 mol% and a second diamine monomer in an amount of 0.01 mol% to 20 mol%.

This invention discloses a polyimide-potassium sodium niobate composite film, its preparation method, and a piezoelectric nanogenerator, belonging to the field of nanogenerator technology. The method includes: ball milling and mixing Nb₂O₅, Na₂CO₃, and K₂CO₃ until uniform and drying; grinding, sieving, calcining, and grinding again to obtain potassium sodium niobate ceramic nanoparticle fillers; mixing anhydrous N,N-dimethylformamide solution and 4,4'-diaminodiphenyl ether powder until uniform; adding pyromellitic dianhydride powder in multiple batches; stirring thoroughly after reaction; adding potassium sodium niobate ceramic nanoparticle fillers; repeated ultrasonication and stirring; heating and stirring reaction; casting; vacuum drying; gradient temperature calcination; and cooling to obtain a polyimide-potassium sodium niobate composite film; the assembled piezoelectric nanogenerator combines... d 31 and d 33 With dual operating modes, it can collect and utilize micro-energy in various application environments, and its power density is significantly enhanced compared to the traditional single operating mode; it also maintains excellent operating stability at a high temperature of 150℃.

This invention discloses a method for preparing a gradient elastic core-shell dual rare earth co-doped cerium oxide abrasive and its application, belonging to the field of mechanical polishing technology. The method includes the following steps: S1, reacting pyromellitic dianhydride with 4,4'-diaminodiphenyl ether and N,N-dimethylformamide to obtain PI microspheres; S2, adding buffer solution, dopamine hydrochloride, and KH560 to react the PI microspheres to obtain modified microspheres; S3, dispersing the modified microspheres and adding a shell material to react, adding a mixed solution, and grinding to obtain the core-shell abrasive; S4, dispersing the core-shell abrasive in anhydrous ethanol, adding polyethylene glycol monomethyl ether to react, and obtaining the abrasive. The abrasive prepared by this invention utilizes dual rare earth co-doping to construct highly efficient chemically active centers, achieving a material removal rate (MRR) of 200~230 nm / min, which is more than 67% higher than pure CeO2 abrasive and significantly higher than single Y... 3+ The CeO2 doping of abrasives increases polishing efficiency by more than 45%, resulting in a significant improvement in polishing efficiency.

The application provides a flexible multifunctional polyimide film resistant to high temperature and high pressure, resistant to flash of nuclear weapons and resistant to laser glare damage, relates to the field of high polymer materials and special protection technology, and is prepared by polycondensation and thermal imidization of aromatic diamine and aromatic dianhydride in a polar aprotic solvent; the aromatic diamine is a mixture of 4,4'-diamino diphenyl ether and 1,3-bis(3-aminophenoxy)benzene; the aromatic dianhydride is a bisphenol A type diether dianhydride and at least one functional dianhydride.The intrinsic tea color polyimide film provided by the application endows the material with excellent intrinsic high temperature resistance.The film has a 5% thermal decomposition temperature greater than or equal to 500 DEG C.Under the condition of 800 DEG C open flame exposure for 5 seconds, the film is not fused, does not drip, is not burned through, and can maintain structural integrity, and meanwhile, the hydrolysis stability of the film in a high temperature and high pressure humid heat environment is improved.

This invention belongs to the field of adsorbent technology, specifically relating to a covalent organic framework material Tp-ODA COF, its preparation method, and its applications. The Tp-ODA COF is composed of alternating 1,3,5-trialdehyde phloroglucinol and 4,4'-diaminodiphenyl ether linked by imine bonds, forming a periodic repeating unit and a porous network structure with a symmetry of P1. The repeating unit is a two-dimensional layered conjugated framework formed by covalently linking 1,3,5-trialdehyde phloroglucinol and 4,4'-diaminodiphenyl ether through imine bonds. The molecular formula of the repeating unit is C1. 54 H 36 N6O9. The covalent organic framework material Tp-ODA COF of the present invention exhibits efficient and stable adsorption performance for anionic dyes. Under the conditions of 25°C and pH=6, the maximum adsorption capacity for Congo red and methyl orange reaches 1532 mg / g and 1490 mg / g, respectively.

The application provides a continuous micro-reactor 4,4'-diamino diphenyl ether preparation system, which comprises a 4,4'-dinitrodiphenyl ether preparation system, a micro-tube reaction system arranged behind the 4,4'-dinitrodiphenyl ether reactant preparation system, and a material collecting system arranged behind the micro-tube reactor. The micro-tube reaction system comprises a micro-tube reactor, a hydrogen inlet and a raw material inlet are arranged on the micro-tube reactor, an inner sleeve and an outer sleeve are arranged on the micro-tube reactor, a material channel is formed between the outer sleeve and the inner sleeve, and the outer sleeve and the inner sleeve are temperature control medium channels. The 4,4'-dinitrodiphenyl ether obtained through the 4,4'-dinitrodiphenyl ether preparation system is introduced into the micro-tube reaction system, hydrogen and 3% palladium-carbon catalyst are continuously added into the micro-tube reactor through the hydrogen inlet and the raw material inlet respectively, the hydrogenation catalytic reduction reaction is realized, and the reaction efficiency is significantly improved through the hydrogenation catalytic reduction reaction in the micro-tube reaction system.

The present invention provides a polyimide film for a graphite sheet, the polyimide film comprising, as polymeric units, dianhydride monomers and diamine monomers comprising 4,4'-methylenedianiline (MDA), meta-phenylenediamine (MPD), 4,4'-diaminodiphenyl ether (ODA), and para-phenylenediamine (PPD), the foam percentage of the polyimide film being 50% or greater.

This utility model relates to the field of chemical mother liquor treatment technology, specifically a mother liquor treatment system for the production of 4,4'-diaminodiphenyl ether. The liquid outlet of the primary centrifuge is connected to the inlet of the primary sedimentation tank via a pipeline. The outlet of the primary sedimentation tank is connected to the inlet of the coarse distillation kettle via a pipeline. The gas outlet of the coarse distillation kettle is connected to the condenser via a pipeline, and the liquid outlet is connected to a buffer tank via a pipeline. The outlet of the buffer tank is connected to the inlet of the secondary centrifuge via a pipeline, and the liquid outlet of the secondary centrifuge is connected to the inlet of the secondary sedimentation tank via a pipeline. By connecting the primary sedimentation tank after the primary centrifuge and the secondary sedimentation tank after the secondary centrifuge, the solid particulate matter in the mother liquor is reduced to less than 5%. The distillation column can completely separate this solid material, increasing the distillation column's throughput while reducing wear on the impeller of the transfer pump and extending the pump's service life.

The present application relates to the field of chemical separation and purification equipment, specifically to a rectifying column for 4,4'-diamino diphenyl ether and a method thereof; comprising a rectifying main body, a gas distribution function part, a self-adaptive flow guide function part, a differential pressure transmitter and an industrial computer; the equipment combines a pulsating gas generator and a self-adaptive bionic flow guide filler with a cantilever type micro-perturbation flow piece; the core is that the micro-perturbation flow piece can elastically deform according to the local airflow pressure, break the high-viscosity material stagnation state and promote the gas-liquid interface update in combination with the gas phase shearing action; the present application effectively suppresses the macroscopic gas phase bias flow and mist entrainment, shortens the residence time of the heat-sensitive material in the high-temperature zone, and significantly reduces the risk of material thermal degradation.

The application discloses an anti-aging phase change heat dissipation film and a preparation method thereof, and relates to the technical field of heat dissipation films. In the preparation of the anti-aging phase change heat dissipation film, furan methylamine is sequentially reacted with methyl acrylate and ethylenediamine to obtain furan-based diamine monomers; octafluoro-1,6-hexanediol is reacted with acyl chloride of trimellitic anhydride to obtain fluorine-containing dianhydride monomers; 4,4'-diamino diphenyl ether, the furan-based diamine monomers, 3,3'4,4'-biphenyl tetracarboxylic dianhydride and the fluorine-containing dianhydride monomers are polymerized, and then imidization is carried out to obtain polyimide; the polyimide and bismaleimide-based siloxane are uniformly mixed, and the polyimide film is obtained after solidification; two layers of the polyimide film and one layer of non-woven fabric film are combined to form a cavity, a phase change material is injected, and the anti-aging phase change heat dissipation film is obtained after hot pressing; and the anti-aging phase change heat dissipation film prepared by the application also has the advantages of self-repairing and stain prevention.

This invention relates to a high-wear-resistant modified phenolic resin material for guide rings and its preparation process. The high-wear-resistant modified phenolic resin material for guide rings is prepared from the following raw materials in parts by weight: 100 parts linear phenolic resin, 20-35 parts polyimide prepolymer, 20-45 parts reinforcement, 10-25 parts wear-resistant filler, 1-3 parts silane coupling agent, and 8-12 parts curing agent; the polyimide prepolymer is prepared by reacting pyromellitic dianhydride with 4,4'-diaminodiphenyl ether; the high-wear-resistant modified phenolic resin material for guide rings prepared by this invention exhibits excellent high-temperature wear resistance.

The present application relates to the technical field of ethylene-maleic anhydride copolymer, and specifically discloses an ethylene-maleic anhydride copolymer and a preparation method thereof, wherein the ethylene-maleic anhydride copolymer is synthesized by using ethylene and maleic anhydride, then the copolymer is modified by using cyclohexylamine, n-octylamine and diaminodiphenyl ether, and mixed with branched epoxy prepolymer to form an adhesive, so that the heat resistance, thermal stability, mechanical strength, dimensional stability and long-term durability of the adhesive are improved.

This invention relates to the field of polyimide synthesis technology, specifically to polyimide materials possessing both high temperature resistance and high toughness, their preparation methods, molded parts, and applications; comprising the following monomers obtained through aqueous phase polymerization: rigid dianhydride monomer, rigid diamine monomer, flexible diamine monomer, and crosslinking monomer; wherein the rigid dianhydride monomer is selected from pyromellitic dianhydride and biphenyl dianhydride; the rigid diamine monomer is selected from diaminodiphenyl ether and phenylenediamine; the flexible diamine monomer is selected from diaminodiphenyl sulfone and bis[(aminophenoxy)phenyl]propane; and the crosslinking monomer is triaminobenzene; the material of this invention uses aromatic rigid groups as the main chain, introduces flexible segments into the side chains, and combines a small amount of crosslinking units, using green aqueous phase polymerization to obtain polyimide that can achieve both high temperature resistance and high toughness, and the mechanical strength and molding performance are superior to existing aqueous phase polymerized products and commercial products, and the toughness can be improved without the addition of toughening agents.

The application discloses a kind of transparent polyimide flexible copper-clad plate and preparation method thereof, belong to electronic chemical technology field.The preparation method of the transparent polyimide flexible copper-clad plate, including the following steps: after organic solvent, filler is ground and dispersed uniformly, monomer diamino diphenyl ether and monomer 1, 3- (4-aminophenoxy) benzene are dissolved to obtain mixed solution;Monomer bisphenol A type diether dianhydride and monomer hexafluorodinitrile dianhydride are added to mixed solution and polymerization reaction occurs, until the viscosity of reaction system is 4-5 million mpa.s, and polyamide acid precursor is prepared;Polyamide acid precursor is coated on copper foil, and transparent polyimide flexible copper-clad plate is obtained by drying under protective gas atmosphere.The polyimide flexible copper-clad plate prepared by the application not only has high light transmittance, but also has high peel strength, tin soldering resistance, etc., and can meet the processing technology requirements of electronic products.

The present invention provides a blended film with a tensile strength of 130 MPa or more that comprises: a polyamide-imide including, as polymerization units, trimellitic acid anhydride (TMA) and a diisocyanate monomer including at least one selected from the group consisting of methylene diphenyl diisocyanate (MDI), 1,5-naphthalene diisocyanate(NDI), p-phenylene diisocyanate(PPDI), m-phenylene diisocyanate(MPDI), 2,4-toluene diisocyanate(TDI), 3,3'-dimethyl-4,4'-diphenylmethane diisocyanate, 3,3'-dimethyl-4,4'-biphenyl diisocyanate, 4,4'-diphenylisopropylidene diisocyanate, 3,3'-dimethoxy-4,4'-biphenyl diisocyanate, dianisidine diisocyanate, tolidine diisocyanate(TODI), and hexamethylene diisocyanate; and a polyimide including, as polymerization units, a dianhydride monomer including at least one selected from the group consisting of pyromellitic dianhydride(PMDA), biphenyl tetracarboxylic dianhydride(BPDA), and benophenone tetracarboxylic dianhydride(BTDA), and a diamine monomer including at least one selected from the group consisting of 4,4'-diaminodiphenylether (ODA), 4,4'-methylenedianiline (MDA), metaphenylenediamine (MPD), paraphenylenediamine (PPD), and m-tolidine.

The present invention relates to the technical field of high-temperature energy storage dielectric films, and discloses a preparation method of a porphyrin cross-linker modified polyimide high-temperature energy storage dielectric film. Polyamic acid (PAA) precursor is obtained by condensing 4,4'-diaminodiphenyl ether (ODA) and pyromellitic dianhydride (PMDA), and introducing ultra-low content of 5,10,15,20-tetrakis(4-aminophenyl)porphyrin (TAPP) as a cross-linker. Cross-linked polyimide film (PCPI) is prepared by solution coating and gradient thermal imidization. The terminal amino groups of TAPP molecules form a covalent cross-linking network with PAA, and the porphyrin macrocycle π-conjugated system provides deep-level charge traps, significantly inhibiting high-temperature carrier migration. The breakdown strength of the optimal sample PCPI-0.1 reaches 475 MV / m at 200 °C, and the discharge energy density is 4.97 J / cm 3 , the charge-discharge efficiency is ≥85%. At the same time, it has a high glass transition temperature, high thermal stability, excellent cycle stability and film-forming uniformity. The solution coating process is simple to prepare, and the process conditions are simple and controllable, which is suitable for the batch production of high-temperature and high-energy storage polyimide dielectric films.