76 results about "Dimethylamine" patented technology

A continuous production process of a xylylenediamine compound comprises the following steps: a, mixing an aromatic dinitrile raw material, an organic composite solvent, a catalyst and an auxiliary agent according to a preset proportion to form a reaction raw material, and conveying the reaction raw material to the lower part of a hydrogenation reactor; b, hydrogen is input from the bottom of the hydrogenation reactor in a jet mode, the reaction raw materials and the hydrogen are subjected to a contact reaction, and the hydrogen is further used for providing driving force needed by reaction material airlift; and c, conveying the reaction material to the upper part of the hydrogenation reactor, and carrying out cyclone separation operation and the like. A device for realizing the continuous production process comprises a hydrogenation reactor, a raw material supply unit, a hydrogen circulation supply unit, a product filtering unit, a product buffer tank and the like. The invention relates to the field of organic and fine chemical synthesis, realizes continuous, stable, automatic and simple production of xylylenediamine compounds, and has the technical advantages of simplifying the production process, optimizing the reaction conditions, improving the safety and economy, saving energy, reducing consumption and the like.

The invention relates to a method for preparing a tin-diol dry photoresist by using molecular layer deposition, which comprises the following steps of: preparing a tin-based mixed film by using a tetradimethylamine tin (tin tetrachloride) metal source and a diol organic source as raw materials through a molecular layer deposition (MLD) technology, and taking the tin-based mixed film as a high-resolution dry positive photoresist. The tin-based photoresist can be used in electron beam lithography (EBL), extreme ultraviolet lithography (EUVL) and beyond extreme ultraviolet lithography (BEUVL). Under 50 kilovolt electron beam exposure, the resolution ratio can reach 7 nanometers at 2000 [mu] C / cm < 2 >; under extreme ultraviolet exposure, the resolution ratio can reach at least 18 nanometers at 22 mj / cm < 2 >; under exposure beyond extreme ultraviolet, the resolution ratio at 520 mj / cm < 2 > reaches at least 32 nanometers. The tin-based mixed photoresist disclosed by the invention has a wide application prospect, and a new technical scheme is provided for developing a semiconductor dry photoresist with higher performance.

This invention discloses a method for preparing furan-based monomer-modified polyamide industrial yarn, comprising the following steps: 1) First, prepare carboxyl-terminated PA6 oligomers for later use; 2) Mix the carboxyl-terminated PA6 oligomers obtained in step 1) with diamine and 2,5-furandimethylamine, add a catalyst after uniform mixing, and carry out polymerization reaction in a closed oxygen-free reaction system. After the reaction is completed, discharge and pelletize to obtain furan-based monomer-modified polyamide chips; 3) Extract and dry the furan-based monomer-modified polyamide chips obtained in step 2), then melt spin them, and after cooling, oiling, stretching, heat setting and winding, obtain furan-based monomer-modified polyamide industrial yarn with a strength >8.2 cN / dtex and an elongation at break in the range of 10-25%, which can be used in the field of polyamide industrial yarns such as automotive seat belts and tire cords.

A method for treating wastewater containing methanol, in which methanol is subjected to anaerobic treatment, is characterized in that organic nitrogen having 2-4 carbon atoms (excluding amino acids) is added. The organic nitrogen is at least one of tetramethylammonium hydroxide, trimethylamine and dimethylamine.

Provided are a resin composition, and a molded body and a multilayer body using the resin composition. A resin composition which contains at least one type of chloride selected from the group consisting of chlorides of alkali metals and chlorides of alkaline earth metals, and which contains a xylylenediamine-based polyamide resin that contains a structural unit derived from a diamine and a structural unit derived from a dicarboxylic acid, 70 mol% or more of the diamine-derived structural units are derived from xylylenediamine, and 70 mol% or more of the dicarboxylic acid-derived structural units are derived from a C4-20 [alpha], [omega]-linear aliphatic dicarboxylic acid.

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.

The invention relates to the field of coating rheological additives, in particular to heat storage stable type polyamide wax and a preparation method and application thereof.The polyamide wax comprises a polyamide wax matrix which is formed by polycondensation of an organic amine combination containing m-xylylenediamine and linear symmetric diamine and an acid component; polyamide fragments are bonded on the surface of the lamellar silicate nucleating agent through ion exchange; the polyamide fragment is formed by condensation of fatty acid and diamine. According to the preparation method, linear symmetric diamine is introduced into a polyamide wax matrix through a unique'molecular conformation optimization-defect targeted closing 'synergistic mechanism, so that the inherent defect density of the crystal is greatly reduced, and meanwhile, lamellar silicate bonded with polyamide fragments is used for accurately covering residual defect sites, so that a molecular-level physical barrier for blocking solvent invasion is formed; therefore, the coating still keeps the anti-sagging performance close to the initial state after being stored at a high temperature for a long time, and the problem of rheological failure caused by collapse of a crystal structure of a solvent type coating is thoroughly solved.

The application discloses a synthesis method of 2-phenyl benz-2-dimethylamine-1-(4-morpholine benzyl phenyl) butanone and belongs to the field of photoinitiator preparation. The method specifically comprises the following steps: (1) reacting chlorobenzene with morpholine to prepare N-phenyl morpholine; (2) performing a Friedel-Crafts reaction on N-phenyl morpholine and 2-amino butyric acid to prepare compound I; (3) performing an aminomethylation reaction on compound I, formic acid and formaldehyde to prepare compound II; and (4) reacting compound II with chlorobenzyl to obtain 2-phenyl benz-2-dimethylamine-1-(4-morpholine benzyl phenyl) butanone. By implementing the application, the process route can be simplified, the use of fluorobenzene, bromine and the like can be avoided, and the yield can be improved.

The present invention discloses a high-efficiency regenerated asphalt and a preparation method thereof, relating to the technical field of regenerated asphalt. The high-efficiency regenerated asphalt comprises the following raw materials in parts by weight: 5-15 parts base oil, 1-3 parts plasticizer, 0.5-1.5 parts anti-aging agent, 0.5-0.8 parts penetrant, 100 parts aged SBS modified asphalt, 3-5 parts structural repair agent, 1-4 parts anti-stripping agent, and 0.05 parts benzyldimethylamine; the structural repair agent is prepared by reacting tetrakis[4-(4'-carboxyphenyl)phenyl]ethylene with linoleyl alcohol to form a tetraester compound, which is then prepared under the action of formic acid and H2O2. The high-efficiency regenerated asphalt prepared by the present invention has good needle penetration, softening point, and anti-stripping properties.

The invention discloses a rapid curing powder coating special for thin-wall pipe fitting roll coating and a preparation method of the rapid curing powder coating, relates to the technical field of metal pipe fitting coating, and aims to solve the problem that the powder coating is difficult to realize uniform coating on a thin-wall base material in consideration of coating performance and pipe fitting structure stability. The invention relates to an epoxy resin paint, which is composed of 500 g of epoxy resin, 100 g of curing agent, 25 g of auxiliary agent, 18 g of pigment, 3 g of rapid curing agent and 354 g of filler, the epoxy resin is bisphenol A epoxy resin, the softening point is 80-120 DEG C, and the epoxy equivalent is 700-900 g / eq; the curing agent is a mixture of adipic dihydrazide and m-xylylenediamine; the auxiliary agent is a mixture of a modified silicone flatting agent, fumed silica and polyethylene wax micro powder; the pigment is one or a mixture of more of titanium dioxide, carbon black, iron oxide red and ultramarine. The method has the advantage of meeting the coating requirement of the precise pipe fitting.

The method comprises the following steps that goose down is soaked in a glutaraldehyde solution in a heat preservation mode, an enzyme preparation is added, the goose down is subjected to heat preservation and standing for enzymolysis treatment, and pretreated goose down is obtained after inactivation, cleaning and drying; 3-aminopropyltriethoxysilane is used for modifying biomass activated carbon to obtain modified biomass activated carbon, the modified biomass activated carbon adsorbs a waterborne polyurethane solution, then low-temperature baking is conducted, and the modified biomass activated carbon is ultrasonically dispersed into the pretreated down feather; raw materials are mixed to prepare membrane liquid, the membrane liquid is prepared from dopamine hydrochloride, glycerol triglycidyl ether, m-xylylenediamine, nano silicon dioxide, lithium chloride, ethyl alcohol and deionized water, and the membrane liquid forms a membrane layer on the surface of goose down through an electrostatic atomization-deposition method. The prepared goose down is high in washing resistance, high hydrophobicity and antibacterial property can still be kept after multiple times of washing, and the filling power of the goose down can be improved.

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 invention relates to a preparation method of a novel perovskite C8H32Cl7 (In1-xSbx) N4 yellow luminescent material, which comprises the following steps: sequentially dissolving indium chloride, dimethyl ammonium chloride, antimony chloride, oleylamine, oleic acid and concentrated hydrochloric acid in dimethyl sulfoxide, and fully stirring and mixing; reacting the mixed solution at a constant temperature, and leaving a generated product after the reaction is finished; and repeatedly cleaning the product with toluene, and drying to obtain the yellow luminescent material. The size of the synthesized novel perovskite yellow luminescent material can reach 2 cm, the requirement of growth on growth conditions is low, and theoretically, the material can be successfully grown according to the synthesis conditions provided by the invention.

A method for improving a separation of tall oil soap from black liquor in a tall oil soap separation phase, which comprises adding of a polymer additive comprising cationic epichlorohydrin-dimethylamine based polymer into black liquor. The cationic epichlorohydrin-dimethylamine based polymer has a weight average molecular weight in the range of 1 500 – 500 000 g / mol. The cationic epichlorohydrin- dimethylamine based polymer may be further crosslinked with ethylenediamine (EDA). The polymer additive can be added to black liquor from pulping process prior to tall oil soap separation, and / or to a tall oil soap solution, which is achieved from separating tall oil soap from black liquor.

The invention discloses an antibacterial fabric finishing liquid containing halamine, an antibacterial fabric as well as a preparation method and application of the antibacterial fabric, and relates to the technical field of fabric finishing liquids. A textile fabric is soaked in the finishing liquid for a heating reaction, then the textile fabric is soaked in a dimethylamine borane aqueous solution for a standing reaction, drying is conducted, the antibacterial textile fabric is obtained, and the finishing liquid comprises an antibacterial halamine siloxane derivative, silver nitrate and water; the structural formula of the antibacterial halamine siloxane derivative is as follows: the halamine-containing antibacterial silane derivative in the antibacterial fabric finishing liquid is hydrolyzed and then reacts with a hydroxyl group on the surface of a fabric, so that a broad-spectrum and efficient antibacterial effect is provided on the surface of the fabric through modification, silver ions are bonded on the surface of the fabric and are reduced into nano-silver particles by adopting dimethylamine borane, and the antibacterial effect is good. Through synergistic antibiosis of halamine and nano-silver, the efficient antibacterial rate is achieved, and the antibacterial rate of the fabric washed with water is still maintained at a high level.

The invention discloses a method for determining N-nitrosamine compounds in animal-derived food, and belongs to the field of food detection. The method comprises the following steps: freezing and grinding animal-derived food, mixing the animal-derived food with an internal standard solution, deionized water and acetonitrile, and freezing and preserving to obtain a pretreated sample; the method comprises the following steps: treating a pretreated sample through a QuEChERS salt bag, centrifuging, carrying out nitrogen blowing concentration, and mixing with deionized water to prepare an enriched solution; purifying the enriched solution by adopting a purification bag or specific functional resin, and centrifugally filtering to obtain a sample solution; and calculating the content of the target compound through a peak area ratio by using a liquid chromatograph-high resolution mass spectrometer provided with an APCI source and taking N-nitrosodimethylamine-D6 as an internal standard. The functional resin is formed by cross-linking specific functional monomers and is large in specific surface area and high in adsorption selectivity; the method has strong anti-interference capability, and can efficiently detect the N-nitrosamine compounds in dried aquatic products and other animal-derived foods.

The present application relates to a kind of double non-noble metal catalyst Co-Ni / La2O3 and its preparation method and the application of selective hydrogenation of m-xylylenediamine in heterogeneous system, belong to catalytic hydrogenation field, the Co-Ni loading of this catalyst is 5wt%, it is cobalt nitrate hexahydrate as cobalt source, nickel nitrate hexahydrate is nickel source, La2O3 is carrier, active metal Co, Ni is loaded on La2O3, reduction and passivation are prepared in tube furnace.The conversion rate of m-xylylenediamine reaches 100% under the conditions of catalyst 50mg, m-xylylenediamine 0.5g, hydrogen pressure 8MPa, temperature 180 DEG C, reaction 5h, and the selectivity of 1,3-cyclohexanedimethylamine reaches more than 70%.The preparation method is simple, low in cost, target product is high in selectivity, has excellent catalytic performance, and easy to separate and has industrialization prospect.

To provide a liner which contains a polyamide resin, wherein the polyamide resin contains a diamine-derived structural unit and a dicarboxylic acid-derived structural unit; 50 mol % or more of the diamine-derived structural unit is derived from a xylylenediamine; a content of a toughness improver in a region up to 30% in a thickness direction from one surface of the liner is from 5 to 20 mass %; and a content of the toughness improver in a region up to 30% in a thickness direction from the other surface of the liner is 0.5 mass % or less.

The application relates to a kind of exfoliated or exfoliation modified boron nitride nanosheet and its preparation method and the application of reinforcing polyurea composite material, wherein the exfoliation modified boron nitride nanosheet, the thickness is 2.31+ / -0.14nm, and the surface amino grafting rate is 3~5%.The exfoliated boron nitride nanosheet (B-BN) is prepared by using mechanical chemical energy, solvent-free high-efficiency exfoliation, and the exfoliation modified boron nitride nanosheet (M-BN) is prepared by using m-xylylenediamine (MXDA) to modify the exfoliated boron nitride nanosheet (B-BN) by ball milling.The exfoliated boron nitride nanosheet has a larger specific surface area, which improves the dispersibility in the polyurea matrix;In addition to the large specific surface area of the exfoliation modified boron nitride nanosheet, the surface also contains amino groups, which can be linked with the isocyanate component by covalent bond, improve the interfacial action with the polyurea system, and enhance the mechanical properties, impact resistance and electrical insulation of the polyurea elastomer.

The invention discloses a preparation method of silicon dioxide for high-friction toothpaste, which belongs to the technical field of silicon dioxide preparation, and comprises the following steps: S1, selecting solid sodium silicate with modulus of 3.0-3.3, preparing a sodium silicate solution with the concentration of 14-20 wt% and a sulfuric acid solution with the concentration of 20-50 wt%, selecting lauryl dimethyl amine oxide as a reaction surfactant, and preparing a sodium silicate solution with the concentration of 14-20 wt% and a sulfuric acid solution with the concentration of 20-50 wt%; adding into a prepared sodium silicate solution, and uniformly stirring for later use; when the sodium silicate solution with the concentration of 14 wt%-20 wt% is prepared, the stirring speed of a stirrer is 30 r / min-50 r / min, and the stirring time lasts for 30 min-60 min; the friction value RDA of a target product is in the range of 160-210, the median diameter D50 is in the range of 10-15 microns, meanwhile, lauryl dimethyl amine oxide is added as a regulator, the sphericity degree of a silicon dioxide aggregate is reduced, the friction value of the target product is increased, and a silicon dioxide product in the toothpaste friction agent has a good application prospect on the premise of improving the friction cleaning effect of the toothpaste. And the permanent damage to the tooth surface caused by daily brushing is reduced as much as possible.

The application discloses a preparation method of a bio-based hyperbranched epoxy resin-bisphenol A type epoxy resin composite resin containing a hexahydro-sym-triazine structure. The preparation process comprises the following steps: (1) synthesizing a terminal mercapto hexahydro-sym-triazine by performing a chemical reaction on an aldehyde compound, a bio-based hydroxyl amine compound and a mercapto alkyl acid; (2) synthesizing a bio-based maleimide monomer by performing a chemical reaction on maleic anhydride, an aniline compound, 2,5-furan dimethyl amine and an alkyl mercaptan; (3) obtaining a bio-based hyperbranched epoxy resin by performing a click reaction on the terminal mercapto hexahydro-sym-triazine, the bio-based maleimide monomer and an alkenyl epoxy compound; and (4) obtaining the bio-based hyperbranched epoxy resin / bisphenol A type epoxy resin composite resin by stirring the bio-based hyperbranched epoxy resin, a bisphenol A type epoxy resin and a curing agent and then heat curing. The application has the advantages of simple process, remarkable advantages of the composite resin in green preparation, high performance and reduction of environmental pollution and the like.

This invention provides a method for preparing 1,3-cyclohexanedimethylamine using a fixed-bed reactor, belonging to the field of chemical reaction engineering technology. The method involves dissolving 1,3-phenylenediamine and an auxiliary agent in solvent a to obtain a substrate solution. This solution is then purged with nitrogen and thoroughly mixed with hydrogen in a fixed-bed reactor containing a catalyst, under controlled temperature and pressure. After the reaction is complete, the solution is cooled under controlled temperature to obtain a 1,3-cyclohexanedimethylamine solution. The solvent is then removed under reduced pressure to obtain 1,3-cyclohexanedimethylamine. This method offers advantages such as precise feed, controllable temperature, mild reaction conditions, low energy consumption, excellent mixing effect, few side reactions, high production efficiency, stable product quality, low exhaust gas pollution, and is environmentally friendly.

The invention discloses a synthesis method and application of high-glossiness and high-toughness MXD6 resin, which comprises the following steps: firstly, preparing a high-concentration m-xylylenediamine aqueous solution, a diamine aqueous solution and an adipic acid aqueous solution, and dropwise adding the adipic acid aqueous solution into the diamine aqueous solution or the m-xylylenediamine aqueous solution until the pH value of the reaction solution is less than 7; performing vacuum concentration and suction filtration to obtain MXD6 salt or nylon salt; mXD6 salt and nylon salt are subjected to a prepolymerization reaction to obtain an MXD6 oligomer and a nylon oligomer, and finally the MXD6 oligomer, the nylon oligomer and a flexibilizer are mixed in proportion for melt polycondensation to obtain the high-glossiness and high-toughness MXD6 synthetic resin. The MXD6 resin modified composite material obtained by blending and modifying the prepared MXD6 synthetic resin has higher glossiness and toughness, has higher strength and fiber floating resistance after being added with the glass fiber, and can be applied to the fields of plastic parts such as automotive trim and electronic and electrical appliances.

Provided is a multilayer container having high transparency after boiling treatment, excellent oxygen barrier properties after retort treatment, and excellent moldability, and a method for producing the same. A multilayer container having: a polyolefin layer containing an acid-modified polyolefin and an acid-unmodified polyolefin; and a polyamide resin layer in contact with the polyolefin layer and containing a polyamide resin, the polyamide resin containing a polyamide resin (a) in which 70 mol% or more of structural units derived from a diamine are derived from m-xylylenediamine, and 30 to 60 mol% of structural units derived from a dicarboxylic acid are derived from an α,ω-linear aliphatic dicarboxylic acid having a carbon number of 4 to 20 and 70 to 40 mol% are derived from isophthalic acid, and the acid-unmodified polyolefin has a melt flow rate of 20 g / 10 min or more, and a temperature X PO is a melting point of the acid-unmodified polyolefin + 65°C.

The invention discloses a halogen-free flame-retardant polyamide composition as well as a preparation method and application thereof, and relates to the technical field of high polymer materials. The halogen-free flame-retardant polyamide composition is prepared from the following components in parts by weight: 34 to 56 parts of polyterephthalamide resin; 33 to 56 parts of poly (m-xylylenediamine adipate) resin; 4-16 parts of an organic hypophosphite flame retardant; 4-52 parts of flat glass fiber; 4-52 parts of a flaky filler; the mass ratio of the flat glass fibers to the flaky filler is (0.6-4): 1; the flatness ratio of the flat glass fibers is (2-6): 1. The halogen-free flame-retardant polyamide composition disclosed by the invention has excellent mechanical properties and cold and hot impact cracking resistance.

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 application belongs to the technical field of polyamides, and particularly relates to a preparation method of high-viscosity polyamide resin. The preparation method comprises the following steps: (1) mixing dicarboxylic acid monomers, diamine monomers, water, a catalyst and a metal compound to perform a salt formation reaction, and then increasing the temperature to 190-280 DEG C to perform polymerization, so as to obtain low-viscosity polyamide resin; (2) adding the low-viscosity polyamide resin and a dianhydride or a hydrolysis product of the dianhydride into an extruder, and extruding the low-viscosity polyamide resin at 200-310 DEG C to increase the viscosity, so as to obtain high-viscosity polyamide resin; wherein the molar proportion of adipic acid in the dicarboxylic acid monomers is more than 90%, and the molar proportion of m-xylylenediamine in the diamine monomers is more than 90%. By using the extrusion viscosity-increasing mode to replace the traditional solid-phase viscosity-increasing mode, the reaction time is shortened, the high-viscosity polyamide resin prepared has more excellent melt stability, and there is no gel phenomenon.

The invention belongs to the technical field of multi-layer composite fuel pipes, and particularly discloses a low-precipitation multi-layer double-barrier composite fuel pipe which comprises five layers of structures including an inner layer, a first bonding layer, a barrier layer, a second bonding layer and an outer layer from inside to outside, and the outer layer is a long-carbon-chain polyamide layer; the first bonding layer and the second bonding layer are TIE layers; the barrier layer is a poly (sebacic diamine m-xylylenediamine) layer; and the inner layer is an ethylene-tetrafluoroethylene layer. The material has the advantages of low precipitation, high barrier, high strength, methanol gasoline, ethanol gasoline and zinc chloride solution resistance and electrostatic breakdown resistance, meets the national novel (national VII) emission standard, reduces the risks of carbon deposition, electrostatic breakdown and leakage of a refueling pipeline, and has a good application prospect in the oil way system of a traditional fuel automobile. And the oil way system of the hybrid electric vehicle has very excellent performance.