45 results about "Hexamethylenediamine" patented technology

This invention relates to a method for preparing hexamethylenediamine by hydrogenation of adiponitrile in the presence of a Raney nickel catalyst, wherein a Raney nickel catalyst modified by treatment with carbon monoxide or carbon dioxide in a liquid medium is used.

This application discloses a slurry for a flexible pressure sensor, its preparation method, and the sensor and its preparation method. The preparation method of the flexible pressure sensor slurry includes the following steps: In a first solvent, a conductive filler is ultrasonically dispersed. The conductive filler includes: (1) graphene oxide, or (2) the graphene oxide and multi-walled carbon nanotubes, wherein the mass ratio of the multi-walled carbon nanotubes to the graphene oxide is (0-3):(1-2). After the reaction, under ultrasonic oscillation, the remaining amine substances are removed using anhydrous ethanol, centrifuged, and pressure-sensitive powder is prepared. A binder, a curing agent, and the pressure-sensitive powder are mixed and ultrasonically dispersed in a second solvent to obtain a uniform slurry. The first solvent is ethylenediamine, hexamethylenediamine, or decanediamine. This application makes technical improvements to the slurry preparation and integration scheme for flexible pressure sensors based on carbon nanotubes.

The application discloses a preparation process of electronic-grade trans-1,2-cyclohexanediaminetetraacetic acid. The preparation process takes industrial-grade 1,2-cyclohexanediamine as raw material, reacts the 1,2-cyclohexanediamine with electronic-grade organic acid to generate a water-soluble salt, crystallizes at 0-30 DEG C, filters out the crystal to reserve the filtrate, adds an alkaline solution to the filtrate, then adds a polar organic reagent to extract, directly adds an aqueous bromoacetic acid solution to the oil phase to react, after the reaction is completed, adds electronic-grade dilute acid to precipitate trans-1,2-cyclohexanediaminetetraacetic acid until the PH of the system is less than or equal to 2, filters and reserves the solid, washes with pure water, and electronic-grade trans-1,2-cyclohexanediaminetetraacetic acid is obtained. The method has a clear process route, can effectively remove metal ion impurities in the synthesis process, the obtained trans-1,2-cyclohexanediaminetetraacetic acid product has high purity, can be used for preparing high-end semiconductor cleaning liquid, and meets the strict requirements of advanced processes on the purity of cleaning chemicals.

The present application belongs to the technical field of tire manufacturing, and particularly relates to an antiskid tire and a preparation method thereof. The antiskid performance of the tire is significantly improved by adding cerium-doped polyoxometalate-based layered compounds and nitrogen-sulfur co-modified zirconium-based MXene layered compounds in the tread compound. The cerium-doped polyoxometalate-based layered compounds are prepared by hydrothermal reaction and calcination treatment using disodium hydrogen phosphate, sodium molybdate, cerium nitrate and hexanediamine as raw materials. The nitrogen-sulfur co-modified zirconium-based MXene layered compounds are prepared by etching, peeling and co-calcination with thiourea after synthesizing ceramics using titanium powder, aluminum powder, zirconium powder and carbon powder as raw materials. When preparing the tire, the rubber is first mixed with carbon black, the two modified compounds and the additives to obtain a masterbatch, then the vulcanization system components are added to obtain a final rubber compound, and finally the finished product is obtained through extrusion, lamination and vulcanization molding. The antiskid tire prepared by the present application has excellent grip on wet and icy road surfaces.

This invention discloses a method for preparing hexamethylenediamine, comprising the following steps: (1) under ammoniation reaction conditions, optionally in the presence of a solvent, subjecting hexanediol and ammonia to an ammoniation reaction to obtain an ammoniation reaction product; (2) separating and obtaining from the ammoniation reaction product a stream containing hexamethyleneimine and water, dehydrating the stream containing hexamethyleneimine and water to obtain a dehydrated stream containing hexamethyleneimine, and returning at least part of the dehydrated stream containing hexamethyleneimine as a circulating stream to the step (1), wherein a water content in the dehydrated stream containing hexamethyleneimine is less than 3 wt %, preferably less than 1.5 wt %. The invention can not only improve the yield of hexamethylenediamine but can also prolong the service life of the catalyst.

A method for preparing flame-retardant surface-layer oriented strand board (OSB) based on interfacial penetration anchoring is provided, comprising: stirring long wood shavings and an acidic adhesive system composed of 1,6-hexanediamine aqueous solution, 2-hydroxyphosphonic acid-acetic acid aqueous solution, and diphenylmethane diisocyanate in a mixer under the condition of hot air flow; discharging the material when the pH value of the shaving surface reaches 4.0-6.0 to obtain pretreated surface-layer large shavings; mixing copolymer CS-H-H, wood fines, and diphenylmethane diisocyanate; discharging the material when the pH value of the wood fines reaches 7.7-8.5 to obtain pretreated core-layer fines; the reaction formula for preparing copolymer CS-H-H is as follows; laying the pretreated material in the order of surface-layer large shavings, core-layer fines, and surface-layer large shavings as the lower surface layer, core layer, and upper surface layer, and performing a hot-pressing process. This solves the problems of low interlayer bonding strength and easy corrosion of metal connectors in previous fine-grain core-layer OSBs.

This application discloses a supported Pt-Au heteronuclear diatomic catalyst, its preparation method, and its application, belonging to the field of electrocatalytic nitrate reduction to ammonia technology. The preparation method provided in this application uses 1,6-hexanediamine as a diatomic structure directing agent and stabilizer. The prepared supported Pt-Au heteronuclear diatomic catalyst has a well-defined diatomic configuration. The preparation method is simple, does not rely on metal precursors or special equipment, and enables large-scale preparation of heteronuclear diatomic catalysts. The supported Pt-Au heteronuclear diatomic catalyst exhibits excellent ammonia synthesis performance and demonstrates good electrochemical recyclability.

The application provides a catalyst, a preparation method thereof and application of the catalyst in preparation of hexanediamine. The preparation method of the catalyst comprises the following steps: step A: performing crystallization treatment on a catalyst precursor to obtain a crystallization system; the catalyst precursor comprises at least one of a titanium-containing SAPO molecular sieve raw material source mixed solution and an alkalized TS-1 molecular sieve catalyst; and step B: performing post-treatment including calcination treatment on the crystallization system to obtain the catalyst. The method can effectively reduce generation of non-framework titanium species, optimize pore structure and active distribution, and thus improve structural stability and anti-inactivation capacity of the catalyst.

Abstract Disclosed are biosynthetic methods and engineered microorganism that enhance or improve the biosynthesis of hexamethylenediamine, caproic acid or caprolactam. The engineered microorganisms include selected aldehyde dehydrogenase activity. Abstract 1 / 10 wo 2020 / 219863 PCT / US2020 / 029793 +HO2C 5CoA 5CoA SUCCINYL-CoA ACETYL-CoA A A HO2C 5CoA E,F,G HO2C 002H 3-OXOADIPL-CoA 3-OXOADIPATE B H OH OH HO2C 5CoA HO2C 002H 3-HYDROXYADIPYL-CoA 3-HYDROXYDIPATE C 000000 HO2C 5CoA HO2C OO2H 3-CARBOXY-2-PENTENOYL-CoA 5-CARBOXY-2-PENTENOATE D K,L,M HOC 5CoA HO2C OO2H ADIPYL-CoA ADIPATE X N Y H Z HO2C HO2C OPO3 ADIPATE SEMIALDEHYDE ADIPYLPHOSPATE O,P HO2C NH 6-AMINOCAPROATE S Q,R CoAS NH NH T 6-AMINOCAPROYL-CoA CAPROLACTAM U H V,WNH2 H2N NH2 6-AMINOCAPROATE SEMIALDEHYDE HEXAMETYLENEDIAMINE Fig. 1 SUBSTITUTE SHEET (RULE 26) 20 26 20 48 92 24 J un 2 02 6 1 / 1 0 w o 2 0 2 0 / 2 1 9 8 6 3 P C T / U S 2 0 2 0 / 0 2 9 7 9 3 2 0 2 6 2 0 4 8 9 2 2 4 J u n 2 0 2 6 A 5 C o A E , F , G H O 2 C O O 2 H 3 - O X O A D I P L - C o A 3 - O X O A D I P A T E B H O H O H 5 C o A H O 2 C 0 0 2 H 3 - H Y D R O X Y D I P A T E C 000000 H O 2 C 5 C o A O O 2 H 3 - C A R B O X Y - 2 - P E N T E N O Y L - C o A J O O 2 H 5 C o A H O 2 C A D I P Y L - C o A A D I P A T E X N Y H Z H O 2 C H O 2 C O P O 3 A D I P Y L P H O S P A T E H O 2 C N H 6 - A M I N O C A P R O A T E S Q , R C o A S N H N H 2 T 6 - A M I N O C A P R O Y L - C o A C A P R O L A C T A M U H V , W N H H 2 N N H 2 6 - A M I N O C A P R O A T E S E M I A L D E H Y D E H E X A M E T Y L E N E D I A M I N E F i g . 1 S U B S T I T U T E S H E E T ( R U L E 2 6 )

The application discloses 1,6-diaminocarbamate synthesized by using M-N4 single-atom solvent and a preparation method, and the method comprises the following steps: mixing a metal salt with a composite nitrogen source composed of melamine and urea, heating to 450-550 DEG C under an inert atmosphere for low-temperature programmed carbonization pyrolysis, obtaining a metal single-atom loaded nitrogen-doped carbon solid material, then mixing and uniformly dispersing the metal single-atom loaded nitrogen-doped carbon solid material with an organic solvent, and obtaining M-N4 single-atom solvent; under a carbon dioxide atmosphere, making hexamethylenediamine and carbamate perform a catalytic reaction in the presence of M-N4 single-atom solvent, and obtaining 1,6-diaminocarbamate. The M-N4 single-atom solvent preparation process has low energy consumption, exhibits better activity and selectivity than high-temperature prepared catalysts in HDC synthesis, the liquid form ensures excellent initial dispersity, and further improves the catalytic efficiency. An extremely attractive technical path is provided for realizing economic and green synthesis of HDC.

The application belongs to the technical field of biological medicine, and particularly relates to a double-network hybrid cross-linked hydrogel, a preparation method and application in 3D organoid culture. The double-network hybrid cross-linked hydrogel is formed by natural cross-linking of a hydrogel precursor material at room temperature, and the double-network hybrid cross-linking includes covalent cross-linking and hydrogen bond cross-linking formed between the hydrogel precursor materials; the hydrogel precursor material includes mercapto-hyaluronic acid-hexanediamine-cytosine, mercapto-hyaluronic acid-hexanediamine-guanine and a polyethylene glycol compound with a multi-arm star structure. The hydrogel has both the mechanical stability of covalent cross-linking and the dynamic responsiveness of hydrogen bond cross-linking, and can be quickly formed under physiological conditions, thereby providing a new matrix material for organoid culture, which is safe and stable, has clear components and can dynamically simulate a tumor microenvironment.

Hydrolysis of polyamide 66 fragments in automotive shredder residue for recovering hexamethylenediamine and / or adipic acid; and / or salts and / or oligomers thereof Herein, a recycling method for automotive shredder residue comprising polyamide 66 is described.

This invention discloses a polyamide curing agent and its preparation method for curing epoxy polyether silicone oil, relating to the field of curing agent technology. The curing agent is a polyamide oligomer with a specific structure consisting of alternating links of malonic acid and hexamethylenediamine in its main chain, with primary amine groups at the ends. The preparation method includes synthesizing malonic acid and hexamethylenediamine in an alcohol solvent via an amidation reaction under the action of a catalyst. The main chain structure of the curing agent of this invention is highly similar to that of the polyamide substrate, allowing it to form a homo-eutectic interpenetrating structure with the substrate during the finishing process. Furthermore, it constructs a dense and stable three-dimensional network through cross-linking reactions between the primary amines at both ends and the epoxy groups of the epoxy polyether silicone oil. This design fundamentally solves the problems of poor compatibility, easy migration, insufficient wash resistance, and hardening of the feel caused by traditional polyetheramine curing agents with polyamides, achieving a simultaneous and significant improvement in wash resistance, flexibility, and interfacial bonding strength during the finishing of polyamide materials.

This invention belongs to the field of polymer materials technology and discloses a high-temperature resistant, high-transmittance nylon copolymer, its preparation method, and its applications. Terephthalic acid, isophthalic acid, 1,4-cyclohexanedicarboxylic acid, and hexamethylenediamine are selected as raw materials. The preparation process uses deionized water as a solvent, mixing all raw materials and solvent in a specific ratio and adding them to a reaction vessel. Through copolymerization, a nylon copolymer is formed. This nylon copolymer, due to the introduction of rigid benzene rings and aliphatic six-membered ring structures into the amorphous polymer PA6I macromolecule, maintains high transmittance while increasing the material's heat resistance. This invention sets technical indicators in the copolymerization salt formation process, ensuring controllable copolymer salt quality and minimizing the impact of copolymer salt quality issues on subsequent polymerization. No additional catalysts or antioxidants are required during preparation, reducing production costs. Furthermore, the preparation process does not require maintaining high temperatures and pressures, facilitating industrialization while reducing production costs.

The application discloses a synthesis method of a TPE skeleton structure molecular cage. Four R group tetraaldehyde group tetraphenylethene (R=OH, OCH3, OCH2CH3) and cyclohexanediamine are added into CHCl3 and heated and stirred to reflux to obtain a solid product, i.e. four R group tetraphenylethene molecular cage (R=OH, OCH3, OCH2CH3), the product is washed, and then dried in a vacuum oven to obtain yellow crystals, i.e. the TPE skeleton structure molecular cage. The synthesis method of the TPE skeleton structure molecular cage is simple and easy to implement, the TPE skeleton structure molecular cage has the AIE effect, has high quantum yield and higher light stability, and the product can be used as a fluorescent probe.

This invention provides a novel method for preparing UHPC wind turbine towers and its application. The UHPC, by weight, comprises: 60 parts cement, 14-18 parts silica fume, 17-22 parts quartz sand, 20-25 parts fly ash, 2-3 parts modified polyvinyl alcohol fiber, 0.8-1.5 parts high-efficiency water-reducing agent, 0.5-0.8 parts dispersant, and 20-23 parts water. The method for preparing the modified polyvinyl alcohol fiber is as follows: 121g of tris(hydroxymethyl)aminomethane is added to 600mL of water, stirred to dissolve, and then the pH is adjusted to 8.0 with hydrochloric acid. The final volume is then adjusted to 1000mL with water. L, obtain buffer solution; take 3g catechol and 3g 1,6-hexanediamine, add to buffer solution, mix well to obtain functional solution; take 5g polyvinyl alcohol fiber, add to functional solution, shake for 24h, take out and wash with water, dry at 40±5℃ to obtain deposited fiber; take 10g SiC-SiO2 modified particles, sonicate for 15min and disperse in 1000mL water to obtain SiC-SiO2 particle dispersion; immerse the deposited fiber in SiC-SiO2 particle dispersion, stir at 120r / min for 2h, take out and wash with water, dry at 40±5℃ to obtain. This invention ensures that the prepared UHPC has excellent mechanical properties while improving chloride ion penetration resistance and durability.

This invention relates to the field of fabric finishing agents, and more particularly to a durable hydrophilic softening agent for irregularly shaped cross-section nylon fabrics and its preparation method. The aforementioned durable hydrophilic softening agent for irregularly shaped cross-section nylon fabrics comprises, by weight, the following raw materials: 10-15 parts adipic acid, 5-10 parts hexamethylenediamine, 1-5 parts amino-terminated polyamide amine, 10-30 parts polyether amine 400, 0.1-0.5 parts catalyst A, 30-50 parts double-terminated epoxy polyether silicone oil, 1-5 parts polyether amine 900, 0.1-1 part diethylenetriamine, 1.1-4 parts glacial acetic acid, 5-15 parts surfactant, 10-20 parts polyethylene glycol, 1-5 parts hexamethylene diisocyanate, 0.01-0.1 parts catalyst B, 1-5 parts 2-acrylamido-2-methylpropanesulfonic acid, 1-3 parts dicyandiamide, and 1-5 parts amino silicone oil. This invention has outstanding softness, good elasticity, hydrophilicity, and washability.

This invention provides a method for treating HDI distillation vessel residue and a hexamethylenediamine product. The method includes: Step S1, performing a first decoking process on the HDI distillation vessel residue to obtain a decoked product and a decoked vessel residue; Step S2, subjecting the decoked product to molecular distillation to obtain recovered HDI and molecularly distilled heavy components; Step S3, mixing the molecularly distilled heavy components and the decoked vessel residue with an alkaline solution for alkaline hydrolysis, and purifying the reaction solution to obtain hexamethylenediamine. This application achieves efficient recovery of HDI from HDI distillation vessel residue through decoking and molecular distillation, reducing the amount of residue to be processed while recovering the effective components, thus saving costs. Furthermore, through alkaline hydrolysis, hexamethylenediamine hydrochloride, urea isocyanate, and HDI polymers in the HDI distillation vessel residue are converted into hexamethylenediamine, resulting in a simpler composition, reducing the difficulty of post-processing. The product, hexamethylenediamine, can be used as a raw material for HDI synthesis, resulting in high economic added value.

This application relates to the field of biotransformation technology, specifically to a transaminase mutant, recombinant plasmid, recombinant bacterial strain, its application, and synthesis method. The transaminase mutant is obtained by mutating a wild-type transaminase, which originates from heterotrophic Gram-negative bacteria and includes the amino acid sequence shown in SEQ ID NO. 5. The mutation sites of the transaminase mutant include any one or more of M439I, V419A, A239P, T276S, H310E, T36A, R43K, N48T, and A165S. By performing site-directed mutagenesis on the wild-type transaminase, a transaminase mutant with excellent overall enzyme activity is obtained and applied to the biocatalytic synthesis of 1,6-hexanediamine, significantly increasing the yield of 1,6-hexanediamine, reducing its industrial production cost, and improving production efficiency.

The application provides a synthesis method of an organic light response probe HBT-CN based on an ESIPT effect, the obtained probe and application thereof, and belongs to the technical field of biological probes.The 1R, 2R-cyclohexanediamine is used as a chiral recognition module, is connected to a 2-(2'-hydroxyphenyl)benzoxazole derivative fluorescent group through a simple amide reaction, and a kind of organic light response probe HBT-CN based on ESIPT effect is successfully designed and synthesized.The probe HBT-CN can realize enantiomer selective fluorescence recognition detection of amino acid ester hydrochloride by direct titration method.In addition, the probe can also be used for enantiomer selective detection through sensitive ratio type ultraviolet absorption change.The fluorescence and ultraviolet response difference of two enantiomers is shown by the research results, and the probe has high sensitivity and enantiomer distinguishing degree.

This invention relates to the field of composite panels and discloses a wear-resistant and UV-resistant fiberglass-silicon core composite panel and its preparation method. The composite panel comprises melamine-faced paper, fiberglass mat, and calcium silicate board impregnated with adhesive. The adhesive includes deionized water, melamine-formaldehyde resin, modified aluminum hydroxide, organosilicon flexibility agent, and coupling agent. The modified aluminum hydroxide is prepared by reacting a functional modifier, N,N'-bis-(2,2,6,6-tetramethyl-4-piperidinyl)-1,6-hexanediamine with benzophenone derivatives and pyridylthiazole derivatives, with 3-chloropropyltriethoxysilane and grafted onto aluminum hydroxide. The organosilicon flexibility agent is prepared by modifying phenyl hydrogen-containing silicone oil with allyl polyoxyethylene ether and glycidyl methacrylate. This invention achieves an integrated structure of the panel, maintaining a surface free of blistering and cracking under complex environmental conditions, with the overall material intact and without delamination, and possessing good antibacterial, fire-resistant, and UV-resistant properties.

The application discloses an organic alkali cleaning solution and a multistage coupling cleaning method for SiC shower heads, and belongs to the technical field of semiconductor component wet cleaning. The organic alkali cleaning solution comprises an organic quaternary ammonium compound, an organic alcohol amine, a chelating agent, an ammonium salt corrosion inhibitor and a fluorocarbon surfactant; wherein the chelating agent is a mixture of trans-cyclohexanediaminetetraacetic acid and diethylenetriaminepentaacetic acid. The multistage coupling cleaning method for SiC shower heads comprises the steps of sequentially performing isopropyl alcohol immersion ultrasonic cleaning, organic alkali cleaning solution immersion ultrasonic cleaning and pure water ultrasonic cleaning, and then combining micro-nano bubble cleaning. The selected organic alkali cleaning solution comprises a three-component synergistic system of trans-cyclohexanediaminetetraacetic acid, diethylenetriaminepentaacetic acid and ammonium citrate. The use of the chelating agent produces a significant synergistic chelation effect on various metal ions, and the ammonium citrate simultaneously plays multiple functions of corrosion inhibition, auxiliary chelation and particle dispersion, which helps to significantly improve the cleaning effect.

This invention belongs to the field of dyeing and printing auxiliaries technology, specifically relating to a sulfonic acid-based polyamide-polyether copolymer hydrophilic finishing agent and its preparation method. The invention provides a method for preparing a sulfonic acid-based polyamide-polyether copolymer hydrophilic finishing agent, using maleic anhydride, polyetheramine, adipic acid, and hexamethylenediamine as raw materials. Through an amidation polycondensation reaction, a polyether-modified polyamide condensate is obtained. Sodium bisulfite solution is added to the polyether-modified polyamide condensate, and a sulfonation reaction is carried out at 120-140°C for 3-4 hours. After the reaction, water is removed to obtain the sulfonic acid-based polyamide-polyether copolymer hydrophilic finishing agent. It can improve the hydrophilicity of nylon fiber fabrics.

Described herein is a biobased semi-crystalline copolyamide having a combination of thermal properties and being suitable to prepare unfilled and fiber-reinforced thermoplastic compounds and composites prepared from first diamine (DA1) selected in the group consisting of 2,2,4-trimethyl-1,6-hexanediamine (2,2,4-TMD), 2,4,4-trimethyl-1,6-hexanediamine (2,4,4-TMD) and a mixture thereof and a second diamine (DA2) selected in the group consisting of 1,9-nonanediamine (C9), 1,10-decanediamine (C10) and a mixture thereof.

An adhesive composition for automotive interior materials and a manufacturing method of the automotive interior materials using the adhesive composition include: a first resin composition including biomass-derived carboxylic acid monomers and ethylenediamine monomers, a second resin composition including biomass-derived carboxylic acid monomers and hexamethylenediamine monomers, and a heat-resistant additive.

This invention discloses a method for preparing a high-temperature resistant modified nylon 66 composite fiber material, relating to the field of nylon technology. The method includes the steps of preparing a composite reinforcing antioxidant component, preparing modified nano-silica, and obtaining the composite fiber material. The raw materials used to prepare the composite reinforcing antioxidant component include maleic anhydride-grafted polyolefin elastomer, 1,6-hexanediamine, processing stabilizer, 3,5-di-tert-butyl-4-hydroxyphenylpropionic acid, and p-toluenesulfonic acid. The raw materials used to prepare the modified nano-silica include nano-silica and a composite silane coupling agent. The raw materials used to obtain the composite fiber material include nylon 66 resin, the composite reinforcing antioxidant component, modified nano-silica, pentaerythritol stearate, epoxy resin, and a composite antioxidant additive. The nylon 66 composite fiber material prepared by this invention exhibits strong high-temperature resistance, excellent mechanical properties, and superior aging resistance.

The application discloses a kind of green enzymatic polycondensation synthesis polyamide 6,5 method, with dimethyl glutarate and 1,6-hexanediamine as raw material, using Novozym435 immobilized lipase as biological catalyst, by direct enzymatic polycondensation reaction preparation biobased polyamide 6,5.The method uses toluene as reaction medium, combined with vacuum by-product, molecular sieve water absorption balance control strategy, realizes the green efficient synthesis of polyamide 6,5, product has excellent thermal stability (melting point 221 DEG C, maximum decomposition temperature 434 DEG C), suitable for melt spinning and other industrial processes, compared with traditional chemical synthesis method, greatly reduce energy consumption, reduce the use of toxic chemicals, provide a new way for the green manufacturing of polyamide.