233 results about "Aromatic diamine" patented technology

The invention provides a preparation method of an h-BN / PI high-temperature-resistant anticorrosive coating, and relates to the technical field of polymer composites.The preparation method of the h-BN / PI high-temperature-resistant anticorrosive coating comprises the steps that under the protection of inert atmosphere, aromatic diamine containing impurity element five-membered rings and aromatic dianhydride containing ether bonds are taken and subjected to a polymerization reaction in a polar aprotic solvent, and the h-BN / PI high-temperature-resistant anticorrosive coating is obtained. A polyamide acid solution is obtained; performing ultrasonic-assisted liquid phase stripping on the micron-sized hexagonal boron nitride to obtain single-layer hexagonal boron nitride; adding the single-layer hexagonal boron nitride into the polyamide acid solution for multiple times, and uniformly stirring to obtain a hexagonal boron nitride / polyimide composite solution; and coating the hexagonal boron nitride / polyimide composite liquid on a to-be-coated surface, and carrying out gradient heating curing to obtain the h-BN / PI high-temperature-resistant anticorrosive coating. The h-BN / PI high-temperature-resistant anticorrosive coating based on interaction of multiple hydrogen bonds has relatively good high temperature resistance, relatively good resistance mechanical property and excellent corrosion resistance.

The invention discloses supercritical fluid foaming polyimide wave-absorbing foam and a preparation method thereof.The thermoplastic polyimide is prepared by the steps that aromatic dianhydride, aromatic diamine and aliphatic diamine serve as comonomers, polyimide acid is generated through solution polymerization, and then high-temperature cyclization is conducted; wherein the mole number of the aliphatic diamine accounts for 10-50% of the total mole number of the diamine, and the free volume and glass transition temperature of a molecular chain are effectively regulated and controlled by introduction of the aliphatic diamine; the wave-absorbing foam is prepared by taking polyimide as a matrix, doping 1-20wt% of wave-absorbing filler, and foaming for 1-3 hours in a supercritical carbon dioxide or nitrogen environment at the temperature of 180-220 DEG C and the pressure of 9-25MPa, through molecular structure design, the adsorption capacity and impact resistance of polyimide to carbon dioxide are remarkably improved, and the prepared foam has the advantages of light weight, high porosity, uniform foam structure and excellent heat resistance, can realize effective electromagnetic wave absorption in an X wave band, and is suitable for the fields of aerospace stealth and electromagnetic compatibility protection.

The invention discloses a polyimide composite material and a preparation method thereof, and relates to the technical field of functional composites.The polyimide composite material is composed of hollow quartz fibers and silicon-containing polyimide resin, the fiber volume content of the polyimide composite material is 45%-60%, and the density of the polyimide composite material is 1.25-1.55 g / cm < 2 >; wherein the silicon-containing polyimide resin is formed by polymerizing a mixture of aromatic dianhydride, aromatic diamine and diamine containing a siloxane structure, and an end-capping reagent. The preparation method comprises the following steps: synthesizing a polyamide acid solution, preparing a prepreg by preimpregnation, performing by a vacuum bag method, performing hot-pressing curing and performing high-temperature post-treatment. Through collaborative innovation of the components and the process, the preparation method is simple, and the composite material has ultralow density, ultrahigh heat resistance, low dielectric constant and high strength and is suitable for the fields of aerospace, 5G communication, semiconductors and the like.

The invention provides a dye / ion separation membrane with pore diameter and charge coordinated regulation and control as well as a preparation method and application thereof, and belongs to the field of preparation of a double-layer ionic covalent organic framework (COFs) composite membrane. An aromatic polyamide ultrafiltration membrane is used as a base membrane, and a double-layer COFs membrane is constructed on the surface of the aromatic polyamide ultrafiltration membrane through a multi-time interfacial polymerization method. The first layer is a positive charge COFs layer formed by reacting a guanidyl monomer with 1, 3, 5-triformyl phloroglucinol (Tp); and the second layer is a negative charge COFs layer formed by reacting ionic aromatic diamine with Tp. By adjusting the type and concentration of the monomers, the pore diameter and charge distribution of the film layer can be synergistically regulated and controlled, and the double-layer composite film which is stable in structure and orderly stacked is constructed. The obtained membrane has molecular sieve separation and electrostatic regulation functions, can efficiently intercept organic dye molecules in high-salt printing and dyeing wastewater, and has high flux, high selectivity and good chemical stability.

The invention discloses a high-temperature-resistant benzimidazolone polyamide imide battery binder as well as a preparation method and application thereof, and belongs to the technical field of battery materials. The high-temperature-resistant benzimidazolone polyamideimide battery binder with uniformly distributed amide segments and imide segments is prepared through a method for activating aromatic diamine on one side of trimethylchlorosilane and changing the activity of amino groups on the two sides, the comprehensive performance of the high-temperature-resistant benzimidazolone polyamideimide battery binder is excellent, the defects that a traditional binder is poor in heat resistance and insufficient in chemical stability are overcome, and the service life of the high-temperature-resistant benzimidazolone polyamideimide battery binder is prolonged. The introduction of high-polarity groups can improve the wettability and ion transmission capability of the electrolyte, improve the solubility of the electrolyte so as to facilitate electrode forming, and can also form strong chemical bonds or physical adsorption with positive and negative inorganic active materials during application, thereby reducing the structural damage in the cycle process and improving the electrochemical performance of the battery. The lithium ion battery electrode can keep a stable structure in a high-temperature environment, the thermal runaway risk caused by high temperature is remarkably reduced, and the application requirements of the lithium ion battery in a fast charging or high-temperature energy storage scene are well met.

Disclosed are compositions including a first component and a second component. The first component includes an isocyanate-functional polyurethane prepolymer. The second component includes a first difunctional polyol and an aromatic diamine. The composition also may include an accelerator. Also disclosed are substrates comprising a coating formed from one of the compositions disclosed herein on a surface thereof. Also disclosed are armor assemblies comprising one of the substrates disclosed herein.

The invention discloses a diamine monomer based on lignin chemical modification, a polyimide material and a preparation method and application thereof. The invention provides a diamine monomer based on lignin chemical modification and a preparation method thereof. The diamine is used for synthesizing polyimide. And copolymerizing the diamine monomer with an aromatic diamine monomer and a dianhydride monomer to prepare the polyimide material. Due to the addition of diamine, the free volume between polyimide molecular chains can be increased, so that the obtained polyimide material shows considerable dielectric properties in high frequency under the condition that the polyimide material does not contain fluorine, and the polyimide material has good insulating properties, which provides possibility for application to the field of microelectronics.

The invention provides a low-water-absorptivity aramid fiber lithium battery diaphragm, a preparation method thereof and a lithium ion battery, and belongs to the technical field of battery diaphragms. Specific fluorinated side chain aromatic diamine with relatively high activity is adopted, a fluorinated side chain is introduced into the aramid diaphragm through condensation polymerization of aromatic dicarbonyl chloride and the fluorinated side chain aromatic diamine, and the fluorine content is increased by controlling the chain length of a perfluorinated chain, so that the water absorption rate and the water affinity of the aramid diaphragm are obviously reduced, and the performance of the aramid diaphragm is improved. The water content of the diaphragm can be controlled within the requirement of a commercial diaphragm in a vacuum baking mode. Meanwhile, the low-water-absorption aramid fiber lithium battery diaphragm provided by the invention has low swelling property and high heat resistance of the aramid fiber polymer, and the prepared lithium ion battery has excellent capacity, cycling stability and safety performance.

The invention discloses amino-terminated hyperbranched polyamide acid as well as a preparation method and application thereof. The amino-terminated hyperbranched polyamide acid is formed by polymerizing an aromatic anhydride monomer, an aromatic triamine monomer and an aromatic diamine monomer; the mole numbers of the aromatic anhydride monomer, the aromatic triamine monomer and the aromatic diamine monomer are a, b and c respectively, a: (b + c) = 1: 1-1: 1.5, and the proportion of b to c is any proportion. The amino-terminated hyperbranched polyamide acid disclosed by the invention not only has abundant terminal amino groups, but also contains a large number of polar groups such as ether bonds, imidazole rings, amide groups and carboxyl groups in molecular chains. Therefore, a stable water-based colloid emulsion can be formed in the presence of water and a small amount of organic solvent, other auxiliaries are not needed, and the interface performance and the mechanical performance of the composite material can be greatly improved.

The application discloses a kind of aromatic amine epoxy resin curing agent and its design method and insulating epoxy resin and its preparation method, belong to insulating technical field.At least two benzene ring structures are designed, and the benzene ring structures are connected by functional bridge bond;An amino functional group is respectively arranged at the two ends of the designed structure;High electron-withdrawing substituent group is not arranged at the ortho position of the designed amino functional group;Get aromatic amine epoxy resin curing agent;Functional bridge bond is arranged at the 1,4 or 1,3 substitution site of benzene ring structure.Multiple aromatic diamines are used as the curing agent component of epoxy resin, rigid aromatic structure is introduced into the epoxy main chain to enhance its thermal stability and improve the glass transition temperature;Functional bridge bond is introduced between benzene rings as breaking benzene ring conjugated structure, to improve electrical performance.Can prepare high-temperature stability and high-resistance high-voltage direct-current insulating epoxy resin.Help to solve the electrical performance of key insulating parts in DC GIS / GIL under the action of high temperature gradient and high electric field.

The invention relates to the technical field of polyimide film preparation, in particular to a high-light-transmittance polyimide film and a preparation method thereof.The preparation method comprises the following steps that aromatic diamine monomers are subjected to vacuum drying and then dissolved in an organic solvent, dianhydride monomers are slowly and dropwise added after the temperature is increased, a polyamide acid solution is obtained through segmented temperature control curing, and a polyimide film is obtained; performing vacuum defoaming on the solution, coating a substrate with the solution, performing gradient heating imidization treatment to obtain a film crude product, and performing plasma surface treatment and inert atmosphere annealing to obtain the high-light-transmittance polyimide film. According to the preparation method, conventional monomers are adopted, through optimization of drying, polymerization, defoaming, film forming, imidization and post-treatment process parameters, introduction of special structural monomers or external filler adding is not needed, the process is simple, the cost is low, the preparation method is suitable for large-scale production, and the prepared polyimide film is high in light transmittance at the wavelength of 550 nm and high in transparency. The optical uniformity, the surface flatness, the thermal stability and the mechanical property are excellent.

The present application relates to a kind of based on Pickering emulsion method preparation heat-conducting filler-polyimide core-shell microspheres method, the method includes the following steps: aromatic diamine monomer is added with aromatic dianhydride monomer and organic polar solvent into reaction vessel and is reacted;Deposition in water, crush, wash and dry, to obtain polyamide acid salt precursor powder;Then with triethylamine and water stirring reaction, to obtain aqueous phase;Heat-conducting filler and hydrophobic polymer are dispersed in solvent to obtain oil phase;Oil phase and aqueous phase are mixed and emulsified, to obtain water-in-oil Pickering emulsion;Demulsification in precipitator, dry, to obtain heat-conducting filler-polyimide core-shell structure microspheres.The present application also provides the heat-conducting filler-polyimide core-shell microspheres prepared by the method, the method for preparing polyimide-based heat-conducting composite material using the core-shell microspheres and the composite material obtained therefrom.The present application method can efficiently prepare three-dimensional heat-conducting composite material with high thermal conductivity in horizontal and vertical directions.

The invention discloses a tung oil-based non-isocyanate polyurethane photo-thermal anti-icing coating as well as a preparation method and application thereof, and belongs to the field of functional polymer materials. The method comprises the following steps: taking tung oil-based epoxy resin as a raw material, reacting with carbon dioxide to prepare tung oil-based cyclic carbonate, and reacting amino-terminated polydimethylsiloxane with terephthalaldehyde to obtain modified polydimethylsiloxane. And mixing tung oil-based cyclic carbonate, modified polydimethylsiloxane and a specific sulfur-containing aromatic diamine curing agent, spraying, and carrying out programmed heating curing to form the coating on the surface of the base material. A stable liquid-like layer can be formed on the surface of the coating, and the coating has extremely low surface energy and can obviously delay icing time. Meanwhile, the coating is endowed with efficient photo-thermal conversion capability through a D-pi-A molecular structure constructed by sulfur-containing diamine, and quick and active deicing can be realized under the irradiation of sunlight.

The present invention addresses the problem of providing a photosensitive resin composition which has excellent pattern processability, which makes a cured film that exhibits good elongation, and which exhibits good elongation even after having undergone a package reliability test. In order to solve the problem, the present invention proposes a photosensitive resin composition containing: at least one polymer compound selected from the group consisting of polyamide, polyimide, polyamideimide, and polybenzoxazole having, as a partial structure, a diamine residue derived from an aromatic diamine having no phenolic hydroxyl group with an ionization potential of 6.78 eV or more; a cationically polymerizable compound; and a photocationic polymerization initiator.

This polymer film 10 is characterized by comprising a first resin layer 11, a second resin layer 12, and a third resin layer, in that order. The polymer film is also characterized in that: the first resin film 11 forms one outermost layer of the polymer film 10; the first resin layer 11 includes a polyamide resin; the polyamide resin includes a copolymer polyamide that is a polycondensation product of diamine units and dicarboxylic acid units; the proportion of the number of aromatic diamine units to the total number of diamine units included in the polyamide resin that forms the first resin layer 11 is at least 75 mol%; the proportion of the number of isophthalic acid units to the total number of dicarboxylic acid units included in the polyamide resin that forms the first resin layer 11 is at least 22 mol%; the second resin layer 12 includes acid-denatured polypropylene; and the third resin layer 13 includes homopolypropylene.

The invention relates to a composite material, a solar cell and a preparation method and application of the solar cell. The composite material comprises a metal organic framework and polyimide in coordination connection with the metal organic framework, preparation raw materials of the polyimide comprise aromatic dianhydride and aromatic diamine, and at least one of the aromatic dianhydride and the aromatic diamine contains a fluorine group and carboxyl. The composite material is applied between a perovskite layer and an electron transport layer of a solar cell, the stability and the electron transport capacity are improved, interface defects are reduced, and therefore the photoelectric conversion efficiency and the carrier mobility of the solar cell are improved.

Provided are a polyimide compound including a repeating unit having an aromatic diamine component having a specific structure in which a side-chain benzylic position is regioselectively brominated, a gas separation membrane having a gas separation layer containing the polyimide compound, and a gas separation module and a gas separation apparatus each having the gas separation membrane.

This invention relates to an aqueous polyimide / SiO₂ nanocomposite coating and its preparation method. The preparation method of the aqueous polyimide / SiO₂ nanocomposite coating includes: dissolving an aromatic diamine monomer in a system composed of water and an organic base; adding an aromatic dianhydride monomer in batches to react and prepare an aqueous polyamic acid salt solution; adding a silane coupling agent to the aqueous polyamic acid salt solution to react and then adding an orthosilicate ester for in-situ hydrolysis and condensation to prepare an aqueous polyamic acid / SiO₂ nanocomposite coating; coating the aqueous polyamic acid / SiO₂ nanocomposite coating onto a substrate surface, followed by drying and imidization treatment to obtain the aqueous polyimide / SiO₂ nanocomposite coating. The aqueous polyimide / SiO₂ nanocomposite coating of this invention has excellent heat resistance and adhesion properties, and can be widely used in high-temperature protective coatings and electronic packaging fields.

The invention relates to an imidazolium functionalized polyimide anion exchange membrane for diffusion dialysis acid recovery and a preparation method of the imidazolium functionalized polyimide anion exchange membrane, and belongs to the technical field of polymer functional membrane materials. The method comprises the following steps: firstly, carrying out condensation polymerization on a dianhydride monomer BPA-2a and an aromatic diamine monomer to prepare intrinsic microporous polyimide PI-6B containing a hexabenzyl structural unit; performing bromomethylation modification on the polyimide PI-6B-Br by adopting liquid bromine to obtain brominated polyimide PI-6B-Br; and carrying out nucleophilic substitution reaction through an imidazole compound, and introducing an imidazolium cation functional group on a polymer main chain to obtain the imidazolium functionalized polyimide anion exchange membrane. The obtained anion exchange membrane has high ion exchange capacity, high acid dialysis coefficient and excellent acid / salt separation factors, and has good application prospects in the field of waste acid diffusion dialysis recovery.

The invention relates to the technical field of membrane separation, in particular to a functional group regulated covalent organic framework (COF) membrane and a preparation method thereof, and relates to application of the membrane in selective separation of monovalent cations. The preparation method comprises the following steps: condensing a polyaldehyde monomer and aromatic diamine with different side chain substitutions on an interface through oil-water-oil three-phase interface micro-fluidic dripping to generate a two-dimensional COF nanosheet, carrying out ultrasonic dispersion, carrying out vacuum filtration, self-assembling on a porous substrate, and drying to obtain a continuous separation layer with the thickness of 50-150nm. The functional group can regulate and control pore channels and surface charges, flux and selectivity of monovalent cations such as Li < + > can be adjusted, effective separation is kept at the pH of 3-11, and the functional group is suitable for lithium salt extraction and electrolyte purification.

The present application relates to the technical field of insulating paint, in particular to a corona-resistant and high-wear-resistant modified polyimide insulating paint and a preparation method thereof. The corona-resistant and high-wear-resistant modified polyimide insulating paint comprises a polyamide acid resin and nano inorganic particles; the polyamide acid resin is synthesized from a dianhydride and a diamine, and the diamine includes a diamine containing a POSS structure and an aromatic diamine. The polyimide insulating paint prepared by the present application has the characteristics of corona resistance, high adhesion and high wear resistance, and can be used as an insulating paint for special motors and remains stable during long-time operation.

Photoactive materials comprising organic-inorganic hybrid halide perovskite compounds are provided. Photovoltaic cells and light-emitting devices incorporating the photoactive materials into their light-absorbing and light-emitting layers, respectively, are also provided. The halide perovskites have an amAMX3 perovskite crystal structure, wherein am is an alkyl diamine cation, an aromatic diamine cation, an aromatic azole cation, a cyclic alkyl diamine cation or a hydrazinediium cation; A is a monovalent alkylammonium cation or an alkali metal cation; X is a halide ion or a combination of halide ions; and M is an octahedrally coordinated bivalent metal atom.

The application provides a polyimide insulating paint, preparation and application thereof. The polyimide insulating paint comprises a polyimide precursor, a crosslinking agent and a phase separation agent, the polyimide precursor is formed by reaction of aromatic diamine and aromatic dianhydride in an organic solvent, the aromatic dianhydride comprises 3,3',4,4'-diphenyl tetracarboxylic dianhydride with a molar content of 10-30%; the phase separation agent is an organic solvent with a boiling point higher than 170 DEG C, and the content of the crosslinking agent and the phase separation agent is respectively 0.1-10wt% and 10-50wt% of the total mass of aromatic dianhydride and aromatic diamine. The application also provides an electromagnetic wire comprising a conductor and an insulating layer coated on the surface of the conductor, the insulating layer is formed by coating and curing of the polyimide insulating paint of the first aspect. The polyimide insulating paint provided by the application has the advantages of low BPDA content, low cost, resistance to ATF oil water and high PDIV.

The invention relates to a synthesis method of an aminoacridine compound, and belongs to the technical field of organic synthesis. The synthesis method of the amino acridine compound comprises the following steps: reacting an aryne precursor derivative, polysubstituted o-aminobenzonitrile and fluorinion in the environment of acetonitrile and inert gas to obtain an aromatic diamine derivative, mixing the aromatic diamine derivative with a solvent, and reacting to obtain the amino acridine compound. And carrying out cyclization reaction under the action of acid to obtain the aminoacridine compound. The amino acridine compound is prepared by adopting a one-pot method, the process steps are simple, the experimental process is simplified, the raw materials are cheap and easy to obtain, and the product is easy to purify.

Provided is a two-part curing resin raw material that is curable at room temperature and has high strength, while having a long pot life. A two-part curing resin raw material according to an embodiment comprises a first liquid that contains an active hydrogen compound and a second liquid that contains a polyisocyanate, wherein: the active hydrogen compound contains an aromatic diamine having an alkylthio group; and the polyisocyanate contains an allophanate-modified product of an aliphatic polyisocyanate, which has a viscosity of 1300-3300 Pa·s at 25°C and contains 13-25 mass% of NCO.

Disclosed are compositions comprising a first component comprising an isocyanate-functional prepolymer; a second component comprising a polyurethane polyol; an aromatic diamine; and a filler in an amount of greater than 50% by weight to 88% by weight based on total weight of the composition. Also disclosed are methods for treating a substrate with any of the compositions disclosed herein. Also disclosed are substrates comprising a coating formed from any of the compositions disclosed herein on a substrate surface, and optionally a dielectric coating on the substrate surface. Also disclosed are systems and kits comprising a dielectric coating composition and any of the coating compositions disclosed herein.

The invention discloses a polyamide composite material as well as a preparation method and application thereof. The polyamide composite material comprises the following components in parts by weight: 90-150 parts of semi-aromatic polyamide; 30 parts of aliphatic polyamide; 60-90 parts of a reinforcing filler; wherein the semi-aromatic polyamide contains a structural unit derived from aromatic diamine and a derivative thereof and a structural unit derived from aliphatic dibasic acid; the aliphatic polyamide contains a structural unit derived from binary acid with the carbon atom number of 6-10 and a derivative thereof and a structural unit derived from aliphatic diamine, or a structural unit derived from lactam with the carbon atom number of 6-10 or aliphatic amino carboxylic acid; the average retention length of the reinforcing filler is 600 to 900 [mu] m. According to the polyamide composite material disclosed by the invention, specific semi-aromatic polyamide and aliphatic polyamide are compounded, and the dosage of each component is adjusted, so that the prepared polyamide composite material has relatively good fastening force and appearance performance.

The invention discloses an ultraviolet shielding insulating polyurea composite material as well as a preparation method and application thereof, and relates to the field of insulating paint. The polyurea composite material comprises the following components: aromatic isocyanate, aromatic diamine, illite-loaded semiconductor metal oxide, a polymerization inhibitor and a flatting agent, the molar ratio of illite to the semiconductor metal oxide in the illite-loaded semiconductor metal oxide is (4-10): 1. The illite-loaded semiconductor metal oxide is uniformly dispersed in a polyurea system for modification, the weather resistance of the material is improved by utilizing the excellent ultraviolet aging resistance of the illite, the hydrophobicity of the surface of the material is synchronously improved, the risk of wet flashover caused by accumulation of water drops on the surface of the polyurea material is avoided, and the service life of the material is prolonged. When applied to an insulating coating material of a power transmission line, the insulating coating material can meet long-time stable operation in outdoor high-ultraviolet, high-temperature and high-humidity environments, and has relatively high thermal conductivity and breakdown strength performance.

A paper comprising polymeric fibers and a binder, wherein the polymeric fibers comprise first fibers and second fibers, the first fibers comprising an aramid copolymer having a structure derived from the reaction of para-oriented aromatic diamine monomer and benzimidazole monomer with a para-oriented aromatic diacid monomer, the second fibers comprising poly(para-phenylene terephthalate) homopolymer, and the binder comprising a third polymer that is either an aramid homopolymer or aramid copolymer; the paper having an ultimate tensile strength of 21 N-m / g or greater and average specific modulus of 4950 Pa-m3 / g or greater.

The invention provides a conjugated trapezoidal polymer as well as a preparation method and application thereof, and belongs to the field of organic polymer synthesis. The conjugated trapezoidal polymer provided by the invention has a structural unit formed by bonding polycyclic aromatic ortho-diamine and polycyclic aromatic hydrocarbon tetracarboxylic dianhydride; two ortho-amino groups in the polycyclic aromatic ortho-diamine and anhydride in the polycyclic aromatic hydrocarbon tetracarboxylic dianhydride form an imide ring through a C-N bond and a C = N bond respectively. The conjugated trapezoidal polymer provided by the invention has a trapezoidal polymer skeleton formed by bonding polycyclic aromatic diamine and polycyclic aromatic hydrocarbon tetracarboxylic dianhydride, and a C = N double bond in an imide ring and a carbonyl group in a polycyclic aromatic hydrocarbon tetracarboxylic dianhydride structural unit endow the conjugated trapezoidal polymer with better proton storage redox kinetics; and highly reversible and rapid water-phase proton storage can be realized. The proton battery formed by the conjugated trapezoidal polymer provided by the invention has excellent specific capacity and cycling stability.