23 results about "M-Phenylenediamine" patented technology

The application belongs to the technical field of lithium ion batteries, and discloses a poly-m-phenylene isophthalamide-based electrostatic spinning flame-retardant separator and application thereof. The m-phenylene isophthalamide-based electrostatic spinning separator, namely PMIA-based electrostatic spinning separator, is prepared by mixing modified PZS microspheres, PMIA and an organic solvent, and then adopting an electrostatic spinning method. The modified PZS microspheres are prepared by in-situ growth of an inorganic layer SiO2 on the surface of polyphosphazene PZS microspheres with flame-retardant properties. The polyphosphazene PZS microspheres are prepared by a polymerization reaction between tannic acid and hexachlorocyclotriphosphazene. The spinning separator prepared by the application has very excellent porosity, liquid absorption rate and ionic conductivity, and good thermal stability and flame retardancy.

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.

This invention relates to the field of electrocatalytic hydrogen evolution catalysts, and particularly to a method for preparing and applying a DMF-DMSO composite solvent iron-yttrium bimetallic coordination-doped COF hydrogen evolution catalyst. The method involves using nickel foam as a substrate, ferric nitrate nonahydrate and yttrium nitrate hexahydrate as bimetallic sources, pyromellitic dianhydride (PMDA) and m-phenylenediamine (MPD) as organic ligands, a 1:4 volume ratio mixture of dimethyl sulfoxide (DMSO) and N,N-dimethylformamide (DMF) as the reaction solvent, and triethylamine (TEA) as a reaction regulator. The iron-yttrium bimetallic COF structure hydrogen evolution catalyst is synthesized in one step via a hydrothermal method. The catalyst obtained by this invention features an in-situ grown highly crystalline COF framework on a nickel foam substrate, with uniformly dispersed iron-yttrium bimetallic active sites, exhibiting excellent hydrogen evolution catalytic performance at 2000 mA cm⁻¹. ‑2 The overpotential at the current density is only 517 mV. The preparation method of this invention is simple, the reaction conditions are mild, and the raw materials are readily available, achieving a breakthrough improvement in catalytic performance. It has broad application prospects in the fields of water electrolysis for hydrogen production and industrial production of green hydrogen.

This invention relates to the field of sealant technology, specifically to a flexible fire-retardant sealant and its preparation method. The method includes the following steps: preparing a phosphorus-containing polyurethane prepolymer modified epoxy resin, preparing a phosphorus-containing bio-based furan derivative, preparing a resin component for the flexible fire-retardant sealant, preparing a curing component for the flexible fire-retardant sealant, and preparing the flexible fire-retardant sealant. In the curing component of this invention, m-phenylenediamine, a polyamide curing agent, and the phosphorus-containing bio-based furan derivative constitute a composite curing system. The rigid benzene ring of m-phenylenediamine provides high crosslinking density and adhesive strength, while the long aliphatic segments of polyamide increase the degree of freedom of chain segment movement between crosslinking points. The combination of these two components achieves a balance between rigidity and toughness and moderates the activation energy of the curing reaction, resulting in a more stable reaction process. The carboxyl group at the end of the phosphorus-containing bio-based furan derivative can undergo a ring-opening reaction with the epoxy group, covalently anchoring the phosphorus-phenanthrene structure to the crosslinking network, thereby achieving intrinsic flame retardancy and enhancing thermal insulation and flame retardant properties.

The utility model relates to chemical solid -liquid separation device technical field, specifically a kind of multi-stage solid-liquid separation device of m-phenylenediamine crude product, including catalyst settling kettle, the lateral wall of catalyst settling kettle is equipped with first flow rate control valve;In the process that m-phenylenediamine carries out multi-stage separation, it sequentially passes through catalyst settling kettle, first flow rate control valve, first pump body, primary membrane filter kettle, second flow rate control valve, secondary membrane filter kettle and the pipeline intercommunication structure of second pump body and obtains m-phenylenediamine purified liquid to carry out multi-stage solid-liquid separation, in the process of separation, the flow rate of each pipeline is controlled by first flow rate control valve, second flow rate control valve and third flow rate control valve, to balance the air pressure balance between each kettle, reduce the situation that flow rate reduces even counterflow because of pressure problem occurs.

This application discloses a method for preparing highly dispersible and stable catalytically active carbon quantum dots and its applications, belonging to the field of quantum dots. The preparation method includes: placing a homogeneous solution containing a carbon quantum dot precursor, water, and an organic solvent in a sealed container and reacting to obtain carbon quantum dots; the carbon quantum dot precursor is selected from at least one of L-ascorbic acid, glucose, cellulose, citric acid monohydrate, citric acid, urea, L-glutamic acid, and m-phenylenediamine. These carbon quantum dots exhibit excellent dispersibility in both aqueous and ethanol solutions, remaining non-agglomerated for several months, and maintaining excellent dispersibility within a pH range of 4–12. Their spectral response extends into the visible light region, enabling highly efficient photocatalytic reactions on their own; therefore, under simulated sunlight irradiation, almost complete decomposition of pollutants can be achieved.

This invention relates to the field of lithium-ion battery materials technology, and discloses a gradient aramid composite coating separator and its application in lithium-ion batteries. The separator consists of a porous ultra-high molecular weight polyethylene base membrane, a pure aramid underlayer coated on one side, and a composite surface layer. The pure aramid underlayer is made of poly(m-phenylene isophthalamide) and polyvinylpyrrolidone, serving as a flexible buffer layer to dissipate interfacial shear stress. The composite surface layer contains surface-aminated modified nano-ceramic particles, serving as a high-modulus layer to resist external particle puncture. During preparation, the surface slurry is coated onto the semi-dry gel-state underlayer through wet-on-dry coating. Combined with a non-solvent-induced phase separation mechanism, the aramid polymer chains at the interface of the two layers undergo interpenetrating diffusion and in-situ solidification and locking. This invention constructs a continuous mechanical modulus gradient transition structure without physical phase interfaces between the layers, improving the interlayer bonding strength and puncture resistance of the separator, and preventing coating peeling and delamination.

This invention relates to a polyimide membrane, a method for manufacturing the polyimide membrane, and an energy storage device comprising the polyimide membrane, wherein the polyimide membrane contains a polyimide comprising a dianhydride monomer and a diamine monomer as polymerization units, the diamine monomer comprising 4,4-diaminodiphenylmethane and m-phenylenediamine.

The application discloses a kind of high-strength high-transparency aramid film and its preparation method and application.The preparation method of the high-strength high-transparency aramid film includes the following steps: adding m-phenylenediamine into an organic solvent, then adding m-phthaloyl chloride in multiple times, obtaining aramid polymer solution by polymerization reaction;Then the aramid polymer solution is diluted with an organic solvent and transferred to a collection plate by a doctor blade method, dried to fully volatilize the solvent, then solidified in a mixed solution of N,N-dimethylacetamide / water, and assisted with ultrasonic treatment, then dried, finally stretched in two directions and then heat set to obtain a high-strength high-transparency aramid film.The aramid film prepared by the application has high strength and high transparency, and the light transmittance can reach 93.6%, which is suitable for various fields such as special materials and optoelectronic devices.

The application discloses a method for preparing a mixed matrix reverse osmosis membrane by using mesoporous silicon nanotubes, and the method is implemented according to the following steps: 1) obtaining a silicon solid rod by using Pluronic F127 block copolymer and cetyltrimethylammonium bromide under the participation of tetraethyl orthosilicate, then removing the surfactant by using hydrochloric acid to further obtain a mesoporous material, and finally etching the mesoporous material by using polyethyleneimine to obtain the mesoporous silicon nanotubes; 2) then, the synthesized mesoporous silicon nanotubes are added into an aqueous phase solution containing m-phenylenediamine and uniformly dispersed, so that the content of the mesoporous silicon nanotubes in the aqueous phase solution is 0.005% w / v to 0.04% w / v, and an aqueous phase solution is obtained; 3) the aqueous phase solution obtained through the step 2) and a uniform benzenetriyl chloride oil phase solution are used to form a polyamide layer on a support layer by using an interfacial polymerization method, and a mixed matrix reverse osmosis membrane is obtained. The method can significantly improve the flux of the reverse osmosis membrane while maintaining a high rejection rate.

The application discloses a nucleolus-targeted carbon dot and a large-scale preparation method and application thereof, and relates to the technical field of nanometer materials. The large-scale preparation method of the nucleolus-targeted carbon dot is as follows: selecting m-phenylenediamine as a precursor, sulfuric acid as an oxidant and a dehydrating agent, and adopting a solid-phase calcination method to prepare the carbon dot; and the prepared carbon dot is subjected to suction filtration, washing and drying to obtain the nucleolus-targeted carbon dot. The carbon dot prepared by the application has intrinsic nucleolus-targeting property, excellent fluorescence performance and high biocompatibility, and is suitable for nucleolus-targeted fluorescence imaging. The preparation method of the application only adopts a suction filtration and washing mode to realize purification treatment, and the sample can be obtained without dialysis, so that the experimental period is shortened, and large-scale production of hundreds of grams can be realized.

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.

A method of water treatment includes treating a mixture of water and oil with a membrane that includes a polyimide formed by polycondensation between 4,4′-(4,4′-isopropylidenediphenoxy)bis-(phthalic anhydride) (BPADA) and 2,4,6-trimethyl-m-phenylenediamine (TrMPD). The polyimide does not include fluorine. The polyimide is in the form of fibers having an average diameter of 0.5 micrometers (μm) to 5.0 μm, and the fibers are bead-free and are formed by electrospinning to form a membrane having pores with an average size of 2 μm to 10 μm.

This invention discloses a near-ultraviolet emitting copper nanocluster, its preparation method, and its applications. The chemical composition of the copper nanocluster is Cu4MPD7, and its fluorescence emission peak is located near 343 nm. The preparation method employs a simple one-pot aqueous phase method, using m-phenylenediamine as a reducing agent and ligand, reacting it with copper sulfate at room temperature followed by centrifugation. This nanocluster can be used as a fluorescent probe, emitting near-ultraviolet emission through its surface Cu... 2+ The specific binding with glyphosate induces fluorescence enhancement, enabling highly sensitive and selective detection of glyphosate, which has been successfully applied to the analysis of actual samples. Furthermore, due to its near-ultraviolet emission properties and excellent biocompatibility, this nanocluster also has significant application potential in fields such as biolabeling, in vivo imaging, disease treatment, catalytic materials, and the preparation of composite nanomaterials. This invention features a simple process, low cost, and environmental friendliness, providing new materials and methods for pesticide residue detection and the development of functional nanomaterials.

The application relates to a nitrogen-doped carbon-coated silicon nanocomposite material and a green synthesis method and application thereof, and comprises the following steps: under a protective atmosphere, mixing silicon nanoparticles, m-phenylenediamine, hexamethylenetetramine and a non-ionic surfactant according to a mass ratio of (1-14):(28-42):(7-14):(70-105), performing grinding to obtain a uniform powder mixture; performing heat curing treatment on the powder mixture to obtain a resin-based precursor; performing high-temperature annealing on the resin-based precursor under the protective atmosphere to carbonize and form a nitrogen-doped carbon layer, so as to obtain the nitrogen-doped carbon-coated silicon nanocomposite material. The application does not need organic solvents and flammable gases in the whole process, the method steps are simple, the equipment requirement is low, the prepared composite material has excellent electronic conductivity, structural stability and electrochemical performance, and is suitable for high-energy-density lithium ion battery negative electrodes.

The present application relates to a kind of anticorrosion combination polyether and its preparation method, belong to combination polyether technical field, according to weight parts, the preparation raw material of the anticorrosion combination polyether includes:65-80 parts polyether polyol matrix composition, 15-25 parts barrier type composite nanofiller, 3-5 parts surface protective agent, 2.5-5 parts fluorine modified epoxy silane coupling agent, 4-8 parts polyether modified siloxane coupling agent, 2-4 parts chain extender, 1-1.5 parts benzotriazole-phosphite composite stabilizer, 10-15 parts cyclopentane foaming agent, 1-2 parts hardness strengthening agent.Barrier type composite nanofiller, surface protective agent, the polyether polyol matrix composition of the cooperation of the two by containing imidazole ring polyether, m-phenylenediamine base polyether, fluorine modified polyether, effectively improve the anticorrosion ability of combination polyether, satisfy the application demand of harsh environment such as wet, salt, acid and alkali.

The application relates to the technical field of organic synthesis, and provides a preparation method of 4-[(2,4-diaminophenyl)azo]benzenesulfonic acid. The p-aminobenzenesulfonic acid, hydrochloric acid, sodium nitrite and a solvent are mixed, a diazotization reaction is carried out under strong acid conditions to generate a diazonium salt solution; the m-phenylenediamine, formaldehyde, sodium bisulfite and a solvent are mixed to generate 1,3-benzene di(iminomethyl sulfonic acid sodium) coupling solution; then the coupling solution is slowly added into the diazonium salt solution, and stirring is carried out at room temperature overnight; and after alkaline hydrolysis and acidification, the target product is obtained. The diazo coupling reaction is adopted to successfully synthesize a 4-[(2,4-diaminophenyl)azo]benzenesulfonic acid compound, the reagent used in the method is cheap and easy to obtain, the operation is simple, the yield is high, and the method is suitable for industrial production.

This invention discloses a meta-aramid coating slurry, its preparation method, and a battery separator. Hydrogenated nitrile butadiene rubber (NBR) is used as a binder. During the synthesis of meta-aramid, m-phenylenediamine and NBR are first prepared into a mixed solution, and then meta-aramid is prepared. The amide bonds in the meta-aramid form hydrogen bonds with the NBR, allowing the meta-aramid and NBR to bond well together without intermolecular repulsion. When used in a separator coating, the non-repulsive aramid and NBR not only retain the temperature resistance of the meta-aramid but, more importantly, enable the coated separator and the electrode to exhibit extremely high adhesion under hot-pressing conditions. Applying this coated separator to lithium batteries can significantly improve battery safety.

This invention relates to a branched polyaromatic amide, its preparation method, and its applications, belonging to the field of polymer synthesis technology. The method includes: dissolving m-phenylenediamine and 3,5-diaminobenzoic acid in an amide-based aprotic solvent containing Li₂CO₃ under an inert atmosphere; and adding isophthaloyl chloride at low temperature to carry out a polycondensation reaction. This invention successfully constructs a branched structure by introducing 3,5-diaminobenzoic acid as a branching precursor and employing specific subsequent reactions, effectively avoiding gelation side reactions. The prepared branched polyaromatic amide is soluble in common organic solvents such as N,N'-dimethylacetamide and N-methylpyrrolidone, exhibits excellent processing performance, and maintains high mechanical strength and good thermal stability. Its tensile strength can reach 256 MPa, and its 5% thermal decomposition temperature can reach above 480℃, solving the technical problem of decreased mechanical strength and thermal stability caused by the introduction of a third monomer in traditional modification methods.

This invention relates to a salt spray resistant and anti-aging curing coating and its preparation method, belonging to the field of coating technology. The coating includes modified epoxy resin, ternary nanocomposite filler, composite light stabilizer, hydrophobic eutectic solvent, polysiloxane-modified aromatic amine curing agent, and bio-based polyurethane curing agent. The modified epoxy resin is prepared by reacting bisphenol F epoxy resin, KH-560 silane coupling agent, and tetrabutylammonium bromide, followed by the addition of bi-terminated epoxy silicone oil, 3,3'-dithiodipropionic acid, and p-toluenesulfonic acid, and then by adding pentaerythritol phosphate and antioxidant 1010. The polysiloxane-modified aromatic amine curing agent is prepared by reacting m-phenylenediamine as a matrix, KH-560 silane coupling agent, diphenylsilanediol, and dibutyltin dilaurate. The bio-based polyurethane curing agent is prepared by reacting castor oil-modified polyol, isophorone diisocyanate, dibutyltin dilaurate, dimethylolpropionic acid, and trimethylolpropane.

The application discloses a phosphorus-nitrogen flame retardant modified epoxy resin and a preparation method thereof, and belongs to the field of flame-retardant materials. The purpose of the application is to obtain a N and P synergistic composite flame retardant by optimizing the structure of the flame retardant, so as to solve the problem that the mechanical properties and the flame-retardant properties of the flame-retardant epoxy resin cannot be considered simultaneously. The phosphorus-nitrogen flame retardant is obtained through two-step reactions of dehydration condensation and addition by using p-xylylene formaldehyde, 4,4-diaminodiphenyl methane and DOPO as raw materials; and the modified epoxy resin is obtained by adding different proportions of the phosphorus-nitrogen flame retardant to m-phenylenediamine as a curing agent. The phosphorus-nitrogen flame retardant modified epoxy resin reaches the standard of the flame-retardant material, the highest limiting oxygen index is up to 36.1%, and the UL-94 test level is V-0. The application has better environmental friendliness and does not release harmful substances. The flame retardant of the application overcomes the above technical defects and realizes high flame-retardant efficiency.

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.