13 results about "Dimethylamine" patented technology

This invention belongs to the field of polymer synthesis materials technology, specifically relating to a long-chain semi-aromatic MXD nylon material and its preparation method. The material is made from components comprising the following weight percentages: m-phenylenediamine 31%-41%, long-chain dicarboxylic acid 59%-69%, nucleating agent 0.05%-0.1%, catalyst 0.03%-0.05%, antioxidant 0.03%-0.05%, and solvent 100%-200%; the long-chain dicarboxylic acid is selected from C... 10 -C 18 This invention relates to a series of dicarboxylic acids. Through molecular structure design, synergistic additives, and process optimization, the prepared MXD nylon material achieves a synergistic balance of ultra-low water absorption, high barrier properties, and high toughness, overcoming the shortcomings of traditional MXD6, such as high brittleness and high water absorption. The process is green and environmentally friendly, with excellent processing performance, and can be widely used in high-barrier packaging, automotive, and electronic and electrical fields.

This invention relates to the field of hydrogenation technology for nitrile compounds, specifically to a method for hydrogenating nitrile compounds. The method includes the following steps: (a) mixing a solution containing a nitrile compound with a hydrogen feedstock, and then subjecting the mixture to a hydrogenation reaction to obtain a hydrogenated product; (b) separating the hydrogenation product from step (a) into a gas phase and a liquid phase, with a portion of the gas phase recycled back to the hydrogen feedstock and a portion of the liquid phase recycled back to the solution containing the nitrile compound. By recycling a portion of the gaseous and liquid phase reaction products back to the feedstock before mixing, side reactions can be effectively suppressed and the accumulation of heavy components during the reaction process can be avoided. This solves the problems of low selectivity, unstable operation, short expected catalyst lifespan, poor equipment safety, and poor process stability in the preparation of amine compounds in existing technologies. It can be used for the industrial continuous production of amine compounds such as m-phenylenediamine.

The present application relates to the field of film, particularly to a kind of biaxially oriented polypropylene matt film and its preparation method, matt film includes the matt layer, core layer and light layer arranged in sequence, matt layer includes random copolymer polypropylene and 40~55wt% high density polyethylene;Core layer includes homopolymer polypropylene and 10~15wt% relative viscosity is 2.2~3.5 m-xylylenediamine-adipic acid copolymer;Light layer includes homopolymer polypropylene and 5~10wt% 2,2,6,6-tetramethyl-4-piperidinol graft polyethylene.The present application is through 2,2,6,6-tetramethyl-4-piperidinol graft polyethylene capture polypropylene radical generated by ultraviolet light initiation;Also through m-xylylenediamine-adipic acid copolymer improves the dimensional stability of film under temperature change, and inhibits oxygen from core layer to light layer migration, synergistic inhibition chain degradation, reduce light layer powder, improve the problem of uneven transfer of coating liquid, meet the demand of high-speed production.

The application discloses a catalyst for directly and one-step hydrogenation of isophthalonitrile (IPN) into 1,3-cyclohexanedimethylamine (1,3-BAC), a preparation method and application thereof, and belongs to the field of hydrogenation catalysts. The catalyst prepared by adopting a precipitation method has a proper specific surface area and basicity, and is combined with a unique catalyst preparation process, so that the catalyst has the characteristics of high activity, long service life and the like, the conversion rate of isophthalonitrile reaches 100%, and the selectivity of 1,3-cyclohexanediamine reaches 80%. Meanwhile, the catalyst preparation method has the advantages of simple process and low cost, and is suitable for industrial production.

The application provides a process method for chemically recycling 1,3-propanediol and co-producing aromatic chemicals, which uses polytrimethylene terephthalate (PTT) waste or particles (or leftover materials and the like) and ammonia water as raw materials, and obtains 1,3-propanediol, terephthalamide, terephthalic acid, terephthalonitrile and terephthalonitrile through unit operation steps such as ammonolysis depolymerization, acidification, extraction, reduced pressure distillation, catalytic dehydration and catalytic hydrogenation. The technical process realizes the resource utilization of waste polyester plastics, and co-produces aromatic amides and nitrile high-value chemicals.

The present application relates to the field of amine preparation, in particular to a preparation method of amine compounds. The preparation method comprises: mixing a nitrile compound solution and hydrogen to obtain a gas-liquid mixture, and feeding the gas-liquid mixture into a fixed bubble bed reactor as raw material to react with a catalyst in the fixed bubble bed reactor. The present application can improve the content of dissolved hydrogen in the reaction system, reduce the reaction pressure, inhibit the side reaction, avoid the accumulation of heavy components in the reaction process, ensure the activity and service life of the catalyst and the quality of the product, reduce the energy consumption of the production process, improve the conversion rate of nitrile raw materials and the selectivity of amine products, and make the device run more stably by using the fixed bubble bed reactor to prepare m-xylylenediamine from m-xylylenecarbonitrile through hydrogenation.

The application discloses an anti-wrinkle vortex spinning polyester-viscose blended yarn and a preparation method thereof, and particularly relates to the technical field of blended yarns. A polyurethane prepolymer is obtained by reacting a polymer dihydric alcohol with diisocyanate, and then a linear polyurethane-urea copolymer is prepared by solution polymerization in a solvent containing a catalyst with the addition of a chain extender. The chain extender is prepared by heating reaction of 1,3-cyclohexanedimethylamine and maleic acid diphenyl ester under inert atmosphere, and then anti-wrinkle elastic staple fibers are obtained through spinning, drafting and cutting. The anti-wrinkle elastic staple fibers are mixed with polyester staple fibers and viscose staple fibers, and then after opening, scutching, carding and drawing, the mixture is fed into a vortex spinning machine for spinning, and then heat treatment is performed, so that the anti-wrinkle vortex spinning polyester-viscose blended yarn is obtained. The application significantly improves the anti-wrinkle property and elastic recovery rate of the blended yarn through the elastic recovery characteristics of the polyurethane-urea copolymer, and the blended yarn has soft hand feeling and washing resistance. In addition, the vortex spinning yarn has less hairiness and good wear resistance, and does not need to be cross-linked with formaldehyde, so that the application is green and environment-friendly.

The application discloses a synthesis method of 1,3-bis(citraconimidemethyl) benzene, citraconic anhydride and m-xylylenediamine are reacted in the presence of an organic acid and a benzene series solvent to obtain 1,3-bis(citraconimidemethyl) benzene, wherein the mass of the organic acid accounts for 30-50% of the total mass of the organic acid and the benzene series solvent. In the synthesis method, the benzene series solvent and the organic acid are used as double solvents, the organic acid also has the function of a catalyst, the amount of material is small, the condensation reflux temperature is low, the inhibition effect on amine byproducts is good, the corrosion of the reaction container is small, the reaction time is short, the double solvents after the reaction do not need to be separated, can be directly used, the atomic economy is high, and the industrialization is more favorable.

The present application relates to the technical field of nylon film material, in particular to a preparation method and application of a slow-crystallization high-transparency MXD6 copolymer nylon biaxial stretching film, wherein the preparation method comprises the following steps: first, reacting adipic acid, a binary acid containing an ether bond and m-xylylenediamine in deionized water to generate an MXD6 salt, then copolymerizing the MXD6 copolymer salt to obtain an MXD6 polymer, and adding perfluoroglutaric acid in the copolymerization process; after the reaction is completed, the copolymer MXD6 granules are obtained through extrusion and granulation, and the MXD6 copolymer nylon biaxial stretching film is obtained through biaxial stretching. The MXD6 copolymer nylon biaxial stretching film prepared by the present application has the characteristics of slow crystallization and high transparency.

The application discloses a high-thermal-stability shape memory bionic adhesion structure and a preparation method, and belongs to the technical field of bionic adhesion structures. The structure uses m-xylylenediamine (MXDA) with a benzene ring as a curing agent of an epoxy resin monomer, selects bisphenol A diglycidyl ether (DGEBA) with a purity of greater than or equal to 85% as an epoxy monomer, and selects n-octylamine (OA) as an active agent to promote the reaction between MXDA and DGEBA. A microstructure template is prepared by a deep silicon etching method, and a cylindrical microstructure is prepared on the surface of the epoxy resin, so that the structure has the characteristics of high adhesion, relatively low pre-pressure, high adhesion-pressure ratio and high switching ratio. The adhesion performance of a traditional epoxy-based shape memory bionic adhesion structure is improved, and the transition temperature of the bionic adhesion structure is significantly improved, so that the application scenarios of the shape memory bionic adhesion structure are expanded.

This disclosure provides an epoxy resin-based curing agent that can be cured in humid environments and its preparation method. The preparation method includes: obtaining the epoxy resin-based curing agent by reacting cashew nut shell powder, formaldehyde source, m-phenylenediamine, and another amine compound through a Mannich reaction; wherein the other amine compound is triethylenetetramine or 2-methylpentanediamine. This invention uses cashew nut shell powder as the sole phenolic source, ensuring that Mannich substitution mainly occurs at the ortho / para positions while retaining the phenolic hydroxyl sites. Through its unique meta-15-carbon unsaturated straight chain (C15 chain), it greatly improves the enrichment degree of long-chain hydrophobic flexible side groups at the substitution ends and the interfacial water displacement capacity at the molecular level.

This invention discloses a method for the hydrogenation of isophthalonitrile to prepare m-phenylenediamine, belonging to the field of organic chemical raw material synthesis technology. The catalyst utilizes ligand confinement to control the size of metal sites, and then employs a deposition-precipitation method to load noble metals onto the surface of a nano-support in the form of atomically dispersed single atoms and / or clusters, obtaining the atomically dispersed noble metal catalyst. The loading of the active metal in the catalyst is 0.1-1.5 wt%. The catalyst of this invention exhibits strong low-temperature hydrogenation activity and selectivity, making it highly suitable for applications in the catalytic hydrogenation of isophthalonitrile to prepare m-phenylenediamine under mild conditions (25-60 °C, 0.25-1.5 MPa). This catalyst features low raw material cost, simple preparation process, stable performance, and high catalytic activity, overcoming the stringent reaction conditions and the need for additional alkaline additives required by catalysts with non-noble metals such as Ni and Co as the main active components.

This invention provides an antibacterial air freshener made from Atractylodes lancea volatile oil and its preparation method, belonging to the field of daily consumer goods technology. It comprises the following components by volume fraction: 0.5%~1.5% Atractylodes lancea volatile oil, 1.5%~4.5% main solubilizer, 3%~8% co-solvent, 1%~3% fragrance, 30%~50% anhydrous ethanol, and the balance being water. Preferably, the main solubilizer is a composite solubilizer system composed of dodecyl dimethylamine oxide OB-2 and alkyl glycoside APG10, with a volume ratio of 1~3:1. The antibacterial air freshener made from Atractylodes lancea volatile oil of this invention is clear and transparent in appearance, and exhibits an antibacterial rate of greater than 99.99% against Staphylococcus aureus, Escherichia coli, and Candida albicans.