426 results about "Hexamethylenediamine" patented technology

The invention discloses a biosynthesis system for high-yield 1, 6-hexamethylenediamine and application of the biosynthesis system, and belongs to the technical field of biology. According to the method, key genes which are excavated and optimized in a 1, 6-hexamethylenediamine biosynthetic pathway are co-expressed in a single cell module or a multi-cell module, and different enzyme elements expressed by the cell module are subjected to enzyme cascade reaction, so that 1, 6-hexamethylenediamine can be efficiently synthesized by taking caprolactam or 6-aminocaproic acid as a substrate; furthermore, after the carboxylic acid reductase MaCAR is mutated, the catalytic activity of the carboxylic acid reductase MaCAR can be remarkably improved, and the yield of the 1, 6-hexamethylenediamine is further improved; in addition, the biosynthesis system disclosed by the invention directly takes the cell module as a whole-cell catalyst, and an enzyme purification step is avoided, so that the biosynthesis system has the advantage of low cost.

The invention discloses a flame-retardant high-temperature-resistant fiber and a preparation method thereof, and relates to the technical field of fibers. When the flame-retardant high-temperature-resistant fiber is prepared, 1, 6-hexamethylenediamine, 1, 6-adipic acid, tetrahydrodifuran [3, 4-B: 3 ', 4'-D] furantetraone and a phosphorus-sulfur composite flame retardant are copolymerized to generate a polyamide-polyamide acid solution; 4-aminopyridine and the polyamide-polyamide acid solution are subjected to a reaction, and modified polyamide is prepared; the modified polyamide is subjected to melt spinning, and polyamide fibers are prepared; the preparation method comprises the following steps: pretreating nano titanium dioxide by using 4-bromobutyl trimethoxy silane to prepare modified nano titanium dioxide; mixing the modified nano titanium dioxide and ethanol to prepare a light-resistant antibacterial finishing agent; and carrying out post-treatment on the polyamide fiber by using an anti-light antibacterial finishing agent to prepare the flame-retardant and high-temperature-resistant fiber. The prepared fiber is excellent in comprehensive performance, particularly outstanding in flame retardance and high temperature resistance, and suitable for the fields of special protective clothing, high-temperature filtering materials and the like.

The invention discloses a glue solution for a copper-clad plate and a preparation method of the glue solution, and relates to the technical field of copper-clad plates. According to the prepared glue solution for the copper-clad plate, the composite epoxy resin, the curing agent, the accelerant, the solvent, the flexibilizer and the inorganic filler, the composite epoxy resin comprises bisphenol A epoxy resin, epoxy phenyl polysiloxane, itaconic acid polyaryletherketone and hydroxyl-terminated fluorine-containing vinyl polysiloxane, so that the interface bonding force with the copper plate is enhanced; the dielectric constant and the dielectric loss are effectively reduced, the peel strength and the toughness of the material are also remarkably improved, and the toughening agent is modified polyether sulfone microspheres; the modified polyethersulfone microspheres are prepared by coating polyethersulfone microspheres with hexamethylenediamine tetrapropionamide diamine, the hexamethylenediamine tetrapropionamide diamine is prepared by carrying out acylation condensation reaction on hexamethylenediamine tetramethyl propionate and ethylenediamine, and the polyethersulfone microspheres are prepared by carrying out electrostatic spinning on a spinning solution of polyethersulfone and vinylpyridine, so that the peel strength of the glue solution is remarkably improved.

The invention discloses a catalyst for preparing ultrahigh molecular weight polyoxyethylene as well as a preparation method and application thereof, and relates to the technical field of catalyst preparation. The preparation method of the catalyst comprises the following steps: S1, carrying out a reaction on 6-hexamethylenediamine and allyl acrylate to generate an intermediate 1, S2, carrying out a reaction on the intermediate 1 and diphenylphosphine to generate an intermediate 2, S3, carrying out a reaction on the intermediate 2 and allyl bromide to generate an intermediate 3, and S4, carrying out a reaction on the intermediate 3 and 9-boron bicyclo [3.3. 1] nonane. The prepared catalyst is high in catalytic activity, ultrahigh molecular weight polyoxyethylene can be prepared, and the molecular weight distribution of the prepared ultrahigh molecular weight polyoxyethylene is narrow.

The invention relates to the technical field of biomedical materials, and discloses a thrombectomy stent support material and a preparation process thereof, the thrombectomy stent support material comprises the following components by mass: 60-70% of a polysebacic diglyceride prepolymer; 25-35% of a dynamic covalent bond cross-linking agent; 5%-10% of carboxylated nano-diamond; 3 to 5 percent of temperature-sensitive and photo-thermal dual-response microspheres; the dynamic covalent bond cross-linking agent is composed of 4-formyl phenylboronic acid and hexamethylenediamine according to a molar ratio of 1: (1-3); the microsphere is prepared from poly (N-isopropylacrylamide), a gold nanorod and a recombinant tissue type plasminogen activating agent, and by combining a low-temperature 3D printing technology, the material can form a complex bionic structure, the mechanical strength is dynamically adjusted along with the physiological environment after implantation, and the material is safely degraded after functions are completed. The material is suitable for the scenes of cardiovascular and cerebrovascular stents, bone repair instruments and the like, has treatment accuracy, manufacturing suitability and clinical safety, and solves the problems of non-degradability, sudden drug release, mechanical mismatch and the like of traditional implants.

The invention relates to the technical field of precious metal recovery, in particular to a process for separating precious metal from copper-nickel smelting waste, which comprises the following steps: crushing and grading the waste, adding a sulfuric acid solution containing etidronic acid, leaching, and washing, drying and crushing filter residues to obtain a pretreated material; mixing the pretreated material with a sodium peroxide-sodium carbonate composite flux, roasting, leaching with water, and filtering to obtain a filter residue B; adding a leaching agent containing hydrochloric acid, sodium chlorate and 1, 2-cyclohexanediamine tetraacetic acid into the filter residue B according to the ratio of 1: 3-1: 5, and filtering to obtain filtrate C and filter residue C; adjusting the pH value of the filtrate C to 1.5-2.5, adding an ethanol solution of sodium N, N-diethyldithiocarbamate, precipitating, washing and calcining to obtain sponge palladium; adding ammonium chloride into the filtrate D, precipitating and calcining to obtain sponge platinum; and leaching the filter residue C by using a hydrochloric acid-chloroauric acid mixed solution containing diphenylthiourea, and replacing and calcining zinc powder to obtain crude gold. According to the process, the leaching rates of platinum, palladium and gold and the product purity are greatly improved; flux and reagent systems are optimized, consumption and energy consumption are reduced, waste liquid treatment is matched for up-to-standard discharge, and efficient resource recovery and environment-friendly cooperation are achieved.

The invention discloses a thermal antistatic fabric based on polyamide fibers and a preparation method thereof, and relates to the technical field of textile fibers. When the thermal antistatic fabric based on the polyamide fiber is prepared, caprolactam, a flame retardant and hexamethylenediamine react to prepare pre-modified polyamide; the pre-modified chinlon and 3-chloro-1-propanethiol are subjected to a reaction, and modified chinlon is prepared; the preparation method comprises the following steps: sequentially reacting graphene oxide with mercaptopropyltrimethoxysilane and 2-(2H-benzotriazole-2-yl)-4-methyl-6-(2-propenyl) phenol, so as to obtain modified graphene oxide; the modified chinlon and the modified graphene oxide are mixed and then subjected to melt spinning, and modified chinlon fibers are obtained; and twisting the modified polyamide fiber, spinning, and post-processing to obtain the thermal antibacterial fabric based on the polyamide fiber. The warm-keeping antistatic fabric based on the polyamide fiber has good warm-keeping, antistatic, flame-retardant, anti-aging and mechanical properties.

The preparation method comprises the following steps: carrying out acid-catalyzed polymerization on p-terphenyl and a ketone monomer under the action of a first organic solvent and trifluoromethanesulfonic acid, and precipitating, filtering, washing and drying a reaction product to obtain a first polymer; carrying out quaternization reaction on the first polymer and quaternary ammonium salt under the action of a second organic solvent, cooling to room temperature, and adding 1, 6-hexamethylenediamine to obtain a second polymer solution; and coating a substrate with the second polymer solution, and carrying out drying membrane formation, heat treatment and hydroxyl anion exchange to obtain the cross-linked hydroxyl ion exchange membrane. The preparation method disclosed by the invention is simple and suitable for large-scale production, and the prepared anion exchange membrane has high ionic conductivity, excellent dimensional stability and mechanical property and relatively good machinability and application potential, and has a good application prospect in a water electrolysis hydrogen production technology.

The invention discloses clethodim diamine salt as well as a preparation method and application thereof. The stability of the clethodim diamine salt (clethodim 1, 4-butanediamine salt, clethodim 1, 5-pentanediamine salt and clethodim 1, 6-hexamethylenediamine salt) provided by the invention is superior to that of clethodim and clethodim monoamine salt (such as clethodim tert-butylamine salt); meanwhile, the herbicidal activity of the clethodim diamine salt (clethodim ethylenediamine salt, clethodim 1, 4-butanediamine salt and clethodim 1, 5-pentanediamine salt) is superior to that of clethodim tert-butylamine salt, and the herbicidal activity of the clethodim 1, 5-pentanediamine salt is superior to that of clethodim. Most clethodim diamine salt is low in degradation rate in the high-temperature heat storage process and easier to store for a long time, the clethodim diamine salt is higher in melting point than clethodim monoamine salt (such as clethodim tert-butylamine salt), granulation and smashing are more convenient, the clethodim diamine salt can be used as a herbicide to be processed into solid dosage forms such as water dispersible granules and the like, the physical performance of the preparation is better, and the preparation has good application prospects. The commercialization prospect is good.

The invention discloses a green method for synthesizing hexamethylenediamine, which comprises the following steps: by taking adiponitrile and ethanol as solvents as raw materials and taking a porous cobalt-based catalyst and a solid base catalyst which are mixed according to a certain ratio as catalysts, reacting to obtain hexamethylenediamine at the reaction temperature of 70-90 DEG C under the reaction pressure of 2-5MPa H2 and the stirring rotating speed of 500-1000rpm. In the hydrogenation process, the two catalysts are mixed and added according to a certain proportion, and efficient conversion of adiponitrile and high selectivity of hexamethylenediamine can be realized under mild conditions. The catalyst used in the method is simple in preparation process, low in cost and easy to recover, the hexamethylenediamine synthesis process is green, and good economic benefits and application prospects are embodied. The method provided by the invention solves the problem that in the traditional process of synthesizing hexamethylenediamine through adiponitrile hydrogenation, inorganic alkali, such as sodium hydroxide, ammonia water and other strong corrosive additives, needs to be added, so that the conversion efficiency and selectivity are improved, the requirement on equipment is reduced, and meanwhile, the energy consumption of later separation is reduced.

The invention relates to the field of pipeline materials, and discloses a halogen-free flame-retardant MPP power pipeline material and a preparation method thereof.The pipeline material comprises polypropylene, modified multi-walled carbon nanotubes, a coating filler, a compatilizer and a lubricant; the modified multi-walled carbon nanotube is prepared by carrying out acylating chlorination on an oxidized multi-walled carbon nanotube by using thionyl chloride and then reacting with an aminated cyclotriphosphazene derivative; according to the aminated cyclotriphosphazene derivative, phosphonitrilic chloride trimer and 3, 5-di-tert-butyl-4-hydroxybenzylamine react to prepare a cyclotriphosphazene intermediate, the cyclotriphosphazene intermediate and N, N '-bis-(2, 2, 6, 6-tetramethyl-4-piperidyl)-1, 6-hexamethylenediamine are subjected to substitution to prepare a cyclotriphosphazene derivative, and then the cyclotriphosphazene derivative and 1, 6-hexamethylenediamine are subjected to substitution to obtain the aminated cyclotriphosphazene derivative. The coating filler is prepared by preparing modified lignin by combining 2, 2, 6, 6-tetramethyl-4-piperidinol and lignin and then preparing silicon dioxide-coated modified lignin by adopting a sol-gel method, and the pipe prepared by the invention has excellent mechanical properties, flame retardance, thermo-oxidative aging resistance and ultraviolet aging resistance.

The invention provides an adsorption material and a preparation method and application thereof, the adsorption material comprises a carrier and an endotoxin affinity binding ligand, the endotoxin affinity binding ligand comprises a recombinant C factor protein, and the carrier and the recombinant C factor protein are connected through a spacer arm; wherein the carrier comprises at least one of resin, chitosan, cellulose, agarose and glucan; the spacer arm comprises at least one of modified polyethylene glycol, polyvinyl pyrrolidone, polymethylacrylic acid-2-hydroxyethyl ester, polyvinyl alcohol, polyacrylic acid, hexamethylenediamine, divinyl sulfone and glutaraldehyde, and at least one end of the modified polyethylene glycol is provided with carboxyl, aldehyde or amino. The adsorption material provided by the invention can efficiently adsorb endotoxin, has the characteristics of low toxicity risk and excellent blood compatibility, and can improve the safety of blood purification.

The invention provides a high-strength anti-ultraviolet regenerated PET fiber and a preparation method thereof. The preparation method comprises the following steps: in a nitrogen atmosphere, dissolving 2, 2 '-methylenebis [6-(benzotriazolyl)-tetramethylbutylphenol] and hexamethylene diisocyanate in N-methyl pyrrolidone, adding a catalyst for reaction, then heating to remove residual monomers, cooling, dropwise adding into ice methanol to separate out a product, washing, and carrying out vacuum drying to obtain an anti-ultraviolet auxiliary agent; the preparation method comprises the following steps: dissolving an anti-ultraviolet aid and hexamethylenediamine in an aprotic solvent, adding a catalyst, carrying out condensation reaction in a nitrogen atmosphere, and carrying out centrifugal washing and vacuum drying to obtain the anti-ultraviolet composite chain extender, the preparation method comprises the following steps: mixing an anti-ultraviolet composite chain extender with recycled PET fragments, adding an antioxidant, a hydrolysis-resistant solution and a lubricant, and carrying out blending spinning through a double-screw extruder to obtain the high-strength anti-ultraviolet regenerated PET fiber. According to the invention, through anti-ultraviolet-chain extension chemical bonding, the bottleneck that the strength and the function of the regenerated PET fiber are difficult to synergistically improve is broken through.

The application provides a hindered amine light stabilizer and a preparation method thereof, and the preparation method comprises the following steps: putting N, N-bis(2, 2, 6, 6-tetramethyl-4-piperidyl) 1, 6-hexanediamine and an organic solvent into a reaction bottle, heating to 50-80 DEG C, adding methyl acrylate into the system dropwise, obtaining an intermediate I through an addition reaction, and then obtaining a crude product through an ester exchange reaction of the intermediate I and tetramethylpiperidinol in the presence of a catalyst and an organic solvent, washing with water, decoloring, filtering, cooling and crystallizing, filtering and drying to obtain the product; the light stabilizer obtained by the application has multiple hindered amine functional groups, has good heat resistance and extraction resistance, and has good compatibility with resin.

The invention discloses a synthesis method of N, N '-bis-(2, 2, 6, 6-tetramethyl-4-piperidyl)-1, 6-hexamethylenediamine, which comprises the following steps: dropwise adding hexamethylenediamine into a mixture of 2, 2, 6, 6-tetramethyl-4-piperidone and an organic solvent, heating to react, cooling after the reaction is completed, adding a sodium borohydride solid into the mixture in batches, and heating to continue the reaction, so as to obtain the N, N'-bis-(2, 2, 6, 6-tetramethyl-4-piperidyl)-1, 6-hexamethylenediamine, namely the N, N '-bis-(2, 2, 6, 6-tetramethyl-4-piperidyl)-1, 6-hexamethylenediamine. After the reaction is finished, decompressing and spin-drying; the preparation method comprises the following steps: adding 1, 2, 6, 6-tetramethyl-4-piperidinyl-1, 6-hexamethylenediamine into an organic solvent, pulping residues, filtering, washing a filter cake with dichloromethane, combining filtrate, and spin-drying to obtain the N, N '-bis-(2, 2, 6, 6-tetramethyl-4-piperidinyl)-1, 6-hexamethylenediamine. The molar ratio of the 2, 2, 6, 6-tetramethyl-4-piperidone to the hexamethylenediamine to the sodium borohydride is (2.0 to 2.1): 1.0: (1.2 to 2.5); sodium borohydride is adopted to replace a traditional noble metal catalyst, high-pressure hydrogenation reaction is avoided, reaction conditions are mild, operation is safe, and cost is low; the purity and the yield of the product are effectively improved.

The invention relates to a composite aerogel for water treatment and a preparation method thereof, and the preparation method comprises the following steps: activating graphene oxide, and then carrying out amidation reaction on the activated graphene oxide, aminated beta-cyclodextrin and hexamethylenediamine to obtain modified graphene; then carrying out hydrothermal reaction on the GO / BiOCOOH composite material, a Bi < 3 + > solution and formamide to obtain a modified GO / BiOCOOH composite material; crosslinking in a lignin aqueous solution to obtain hydrogel; and finally, performing supercritical drying to obtain the composite aerogel. The preparation method has the beneficial effects that by constructing macroscopic blocky aerogel, the problems that a powder material is easy to lose and difficult to recycle are effectively solved; the high photocatalytic activity is still kept under the condition that iodine doping is not used, and the possibility of secondary pollution of free iodine to a water body due to instability of the material is reduced; under the synergistic effect of the aerogel and the photocatalytic reaction, the efficient proceeding of the adsorption and desorption-photocatalytic reaction is realized; the material is high in stability, easy to recover, capable of being recycled through simple desorption, high in cycle index and long in service life.

The invention relates to the field of silicone oil preparation, in particular to a preparation method and application of hydrophilic antibacterial silicone oil, and the preparation method of the hydrophilic antibacterial silicone oil comprises the following steps: S1, adding N, N, N ', N'-tetramethyl-1, 6-hexamethylenediamine and acetic acid into isopropyl alcohol, stirring at room temperature to obtain a solution, adding a double-end epoxy end-capping agent into isopropyl alcohol, stirring at room temperature, adding the solution, stirring at room temperature to obtain a hydrophilic antibacterial silicone oil solution; heating and reacting to obtain a tertiary amine intermediate; s2, adding the tertiary amine intermediate obtained in the step S1, epoxy-terminated polyether silicone oil and a modifier into isopropanol, heating for reaction, and drying to obtain hydrophilic silicone oil; and S3, adding the hydrophilic silicone oil obtained in the step S2 and silver nitrate into water, stirring at room temperature, and drying to obtain the hydrophilic antibacterial silicone oil. The hydrophilic antibacterial silicone oil prepared by the invention has excellent antibacterial performance, hydrophilic performance and heat resistance, and can be used in the fields of cosmetics, medicines, textiles and coatings.

The invention provides a series of organic chiral micromolecule auxiliary functional materials which can be applied to main body materials, electron transport materials or hole transport materials of functional layers in circular polarization organic light-emitting diodes, and belongs to the technical field of organic electroluminescent materials. According to the invention, chiral oxazoline, chiral binaphthyl, chiral spiro, chiral paracyclophane and chiral 1, 2-cyclohexanediamine are used as chiral construction units, and are introduced into main body, electron or hole transport material molecules to construct a series of chiral compounds containing chiral oxazoline, chiral binaphthyl, chiral spiro, chiral paracyclophane and chiral 1, 2-cyclohexanediamine, and the chiral compounds containing chiral oxazoline, chiral binaphthyl, chiral spiro, chiral paracyclophane and chiral 1, 2-cyclohexanediamine are introduced into main body, electron or hole transport material molecules. The organic chiral auxiliary functional material is a main material, an electron transport material or a hole transport material based on 1, 2-cyclohexanediamine, and the preparation of a circular polarization organic light emitting diode device with high luminous efficiency and high luminous asymmetry factor is realized by using the organic chiral auxiliary functional material.

The invention discloses antibacterial and antistatic nylon as well as a preparation method and application thereof, and relates to the technical field of antibacterial materials. The preparation method of the antibacterial and antistatic nylon comprises the following steps: reacting a first mixed reaction system containing hexamethylenediamine, furandicarboxylic acid, binary acid and water to prepare a carboxyl-terminated prepolymer; and reacting a second mixed reaction system containing the carboxyl-terminated prepolymer, PEG (Polyethylene Glycol) and tetrabutyl titanate in a protective atmosphere to prepare the antibacterial and antistatic nylon block copolymer. The antibacterial and antistatic nylon prepared through condensation polymerization can improve the antibacterial performance of the PA66 base material, can also improve the antistatic performance of the PA66 base material, and can be used for preparing the antibacterial and antistatic PA66 material.

The invention relates to an anti-yellowing transparent polyamide PATMDT / PACMT material and a preparation method thereof, and belongs to the technical field of high polymer materials. The technical problem to be solved by the invention is to provide transparent polyamide with good mechanical properties and yellowing resistance, namely a PATMDT / PACMT material. The material comprises polyamide, the polyamide is obtained through polycondensation of diamine and diacid, the diacid is terephthalic acid, the diamine is 2, 2, 4-trimethylhexamethylenediamine and 4, 4 '-diaminodicyclohexylmethane, and the molar ratio of the 2, 2, 4-trimethylhexamethylenediamine to the terephthalic acid to the 4, 4'-diaminodicyclohexylmethane to the terephthalic acid is (0.5-0.55): 0.5: 1. The PATMDT / PACMT material disclosed by the invention is narrow in molecular weight distribution, excellent in uniformity, high in transparency, excellent in yellowing resistance and excellent in mechanical property, adopts a one-step polymerization process, is relatively small in production equipment, relatively simple in synthesis process, short in production period, relatively low in energy consumption and cost and high in product yield, provides a new thought for industrial production of polyamide materials, and has wide application prospects. The upgrading and innovation of the polyamide industry are accelerated.

The present invention relates to a production process for synthesizing hexamethylenediamine by catalytic hydrogenation of adiponitrile. The process comprises the following steps: 1) preparing a catalyst precursor; 2) calcining the catalyst precursor to obtain a catalyst; 3) catalytic hydrogenation of adiponitrile under the condition of the catalyst to synthesize crude hexamethylenediamine; 4) separating hexamethylenediamine from the discharge of a fluidized bed reactor containing crude hexamethylenediamine. The present invention uses Ni(NO3)2 and / or Mg(NO3)2 as main raw materials, doped with transition metal oxides, and then performs ultrasonic adsorption using Al2O3 as a catalyst carrier to load Ni(NO3)2 and / or Mg(NO3)2 and transition metal oxides on Al2O3, and obtains a catalyst through high-temperature calcination. The doping of transition metal oxides can improve the basicity of the catalyst, eliminating the need to add a strong basic co-catalyst in the catalytic reaction stage, reducing by-product formation. Moreover, it increases the specific surface area of the catalyst, thereby reducing the adsorption of the reaction product hexamethylenediamine on the catalyst, extending the service life of the catalyst, and saving the energy consumption for catalyst regeneration.

The invention discloses a preparation method and application of a high-performance hexamethylenediamine synthesis catalyst, and belongs to the technical field of new materials. A nickel-based hexabasic alloy is prepared from 10%-30% of Ni, 20%-30% of Fe, 0.5%-3% of Mo, 0.5%-3% of Cr, 0.5%-3% of Mn and 50%-60% of Al through a vacuum melting method, the nickel-based hexabasic alloy is physically crushed into alloy powder, then the porous nickel-based catalyst is prepared through a dealloying method, iron plays a role in reducing the cost, the selectivity is improved through the microelement molybdenum, the mechanical strength is improved through the chromium, and the catalytic activity is improved through the manganese. The catalyst has the characteristics of simple preparation process, low preparation cost and the like, has more excellent reaction activity, target selectivity and stability in the reaction of synthesizing hexamethylenediamine through hydrogenation of adiponitrile compared with an industrial catalyst, and shows good economic benefits and application prospects.

The invention relates to a low-expansion moisture-resistant electronic component packaging resin adhesive and a preparation method thereof, and belongs to the technical field of high polymer materials. The resin adhesive comprises the following components: modified resin, phenyl methyl organic silicon resin, epoxy vinyl resin, a dynamic functional curing agent, a microencapsulated dicyandiamide curing agent, perfluorooctyltriethoxysilane, functional filler and the like; the modified resin is obtained by modifying hydrogenated bisphenol A epoxy resin with hydrogen-terminated polydimethylsiloxane and trimethylsiloxy silicate ester, adding a silane coupling agent and mixing; the dynamic function curing agent is obtained by reacting hexamethylenediamine and intermediate powder obtained by reacting 2, 3-dihydroxy benzaldehyde with pinacol borane; the functional filler comprises silicon dioxide and boron nitride which are subjected to surface treatment by a silane coupling agent. The low-expansion and high-moisture-resistance electronic component packaging resin adhesive is prepared from the components according to a specific ratio and a specific method, the components have a synergistic effect and play advantages, and the packaging reliability and the service life of an electronic component are guaranteed.

The invention relates to the technical field of high polymer materials, and particularly discloses modified polyamide, an acid dyeable nylon 66 fiber as well as a preparation method and application of the acid dyeable nylon 66 fiber. The acid dyeable nylon 66 fiber disclosed by the invention has in-situ leveling property, modified monomers, adipic acid and hexamethylenediamine are polymerized to obtain modified polyamide, then the modified polyamide is prepared into pre-oriented yarns, and the pre-oriented yarns are elasticized to obtain the acid dyeable nylon 66 fiber. The ionic group of the modified monomer has an in-situ retarding effect in the nylon 66 fiber and is not combined with a dyeing seat, and an excellent level dyeing effect and a high dye uptake can be obtained without using a leveling agent. The addition amount of the modified monomer is small, the molecular size of the modified monomer is similar to that of adipic acid and hexamethylenediamine monomers, adverse effects on a polymerization process and a nylon 66 molecular structure are small, and the prepared acid dyeable nylon 66 fiber has excellent mechanical properties. The preparation cost of the acid dyeable nylon 66 fiber is low, the process is simple and convenient, and the acid dyeable nylon 66 fiber has a wide application prospect.

The present invention discloses a method for preparing hexamethylenediamine, the method comprising the following steps: (1) subjecting hexanediol and ammonia to an ammonia reaction under ammonia reaction conditions, optionally in the presence of a first solvent, to obtain an ammonia reaction product; (2) separating the ammonia reaction product from step (1) to obtain a hexamethylenediamine product and a heavy component; and (3) performing ammonia decomposition on the heavy component under ammonia decomposition reaction conditions to obtain an ammonia decomposition reaction product, and returning the ammonia decomposition reaction product to step (2). The present invention can not only improve the yield of hexamethylenediamine but also extend the service life of the catalyst.

The invention discloses a coumarin-based bio-based epoxy resin monomer and a preparation method and application thereof, and the structure of the monomer is DPE, DCE and DHE. The monomer takes dihydrocoumarin and biomass amine compounds (including putrescine, cadaverine and 1, 6-hexamethylenediamine) as raw materials, biomass bisphenol DP, DC and DH are prepared through a simple ring-opening reaction, and then the monomer is prepared through a glycidyl reaction. A bisamide structure is innovatively introduced into the epoxy resin monomer, so that the epoxy resin monomer has the advantages of simple and convenient synthesis process, high yield, easily available raw materials, good biological safety and the like, and the performance is superior to that of traditional petroleum-based epoxy resin. The bio-based epoxy resin prepared based on the monomer shows a novel molecular structure and excellent mechanical properties and heat resistance.

The invention discloses a polyimide-aluminum oxide composite film material and a preparation method thereof, the composite film material is composed of a polyimide layer and an aluminum oxide layer deposited and combined on the upper surface of the polyimide layer, and the thickness of the polyimide layer and the thickness of the aluminum oxide layer are both nanoscale; the composite film material is prepared by using atomic layer deposition equipment, and the preparation method comprises the following steps: firstly, depositing a nanoscale polyimide layer on a monocrystalline silicon piece carrier according to a set program by taking pyromellitic dianhydride and hexamethylenediamine as precursor raw materials; and depositing and combining a nanoscale aluminum oxide layer on the upper surface of the polyimide layer according to a set program by taking trimethylaluminum and distilled water as precursor raw materials. The prepared composite film material is different from a current composite film material prepared by blending polyimide and aluminum oxide and then carrying out film casting, the composite film material has a nano-scale polyimide layer with uniform thickness and a nano-scale aluminum oxide layer deposited and combined on the upper surface of the polyimide layer, and the composite film material has a good radiation refrigeration effect.

The application relates to the technical field of circuit conveying equipment, in particular to a fireproof polyvinyl chloride material and a preparation method thereof and a cable sheath pipe. The fireproof polyvinyl chloride material comprises the following raw materials in parts by weight: 90-110 parts of polyvinyl chloride, 10-20 parts of a compatilizer, 8-15 parts of ammonium polyphosphate and 5-8 parts of an ultraviolet aging resistant additive, wherein the ultraviolet aging resistant additive is a mixture of N,N"-bis(2,2,6,6-tetramethyl-4-piperidyl)-1,6-hexanediamine and a metal hydroxide. The fireproof polyvinyl chloride has excellent flame retardant performance and ultraviolet aging resistance.

This invention relates to an antibacterial copolyamide and its preparation method. The antibacterial copolyamide comprises a polyamide A structure formed by hexamethylenediamine and a dodecanoic acid, at least one polyamide B structure other than polyamide A, and an antibacterial agent C structure. The polyamide B structure is formed by at least one diacid b1 and at least one diamine b2, and / or by ring-opening of a lactam b3. The antibacterial agent C structure contains a quaternary phosphonium salt group and is formed by a quaternary phosphonium salt antibacterial agent containing a carboxylic acid group and the diamine b2. The melting point of the antibacterial copolyamide is 180℃~210℃. The antibacterial copolyamide of this invention exhibits good antibacterial stability, possesses highly efficient and long-lasting antibacterial effects, and does not affect the transparency of the polyamide itself.

The application discloses a ruthenium-based catalyst and a preparation method and application thereof. The catalyst is prepared by embedding ruthenium into polyaniline with phytic acid as a medium and then pyrolyzing. The application adds hexamethylene diamine and deuterium water into a high-pressure reaction kettle, adds a catalyst and carries out catalytic reaction in a hydrogen atmosphere, and high deuterium substitution rate hexamethylene diamine is obtained. Through the coordination of phytic acid and ruthenium, the ruthenium is highly dispersed on the surface of polyaniline and exposes a large number of active sites. The pyrolysis temperature is controlled to control the electronic structure of ruthenium and improve the catalyst activity, so that the prepared hexamethylene diamine has a high deuterium incorporation amount. The ruthenium-based thermal catalyst has an alpha-H deuterium incorporation rate of 1,6-hexamethylene diamine up to 95.62%, and the catalyst also has good thermal catalytic stability, and shows certain practical application potential.