143results about "Monocomponent copolyamides artificial filament" patented technology

The invention relates to the technical field of aromatic polyamide high polymers, in particular to a modified poly-p-phenylene terephthamide fiber with high elongation at break and a preparation method of the modified poly-p-phenylene terephthamide fiber. According to the invention, a small amount of 3, 4-difluorobenzene is introduced According to the preparation method, the third monomer containing 4, 4 '-diaminodiphenyl ether and the fourth monomer containing a diaminophenoxy functional group are added, and the molar ratio of the third monomer and the fourth monomer in the total amount of the diamine monomer is controlled, so that the rigid molecular chain structure of the conventional para-aramid fiber is destroyed to a certain extent, the breaking strength of the fiber is maintained, the elongation at break of the polymer fiber is enhanced, and the service life of the polymer fiber is prolonged. The prepared modified poly-p-phenylene terephthamide can still adopt a dry-jet wet spinning process, the cost of a new production line of a factory is saved, the fiber with stable elongation at break index is obtained by optimizing process conditions and parameters, and the elongation at break of the prepared fiber is 3.6% or above.

The invention relates to the technical field of chinlon industrial yarns, and discloses a preparation method of a high-strength and high-toughness chinlon industrial yarn, which comprises the following steps: (1) preparing raw materials; (2) mixing the materials; (3) melt spinning; (4) stretching and heat treatment; (5) fiber surface modification; according to the invention, by fusing the advantages of high crystallization speed of nylon 6 and high melting point and high strength of nylon 66, a matrix material with good processing fluidity is formed, and the strength and fatigue cycle resistance of the chinlon industrial fiber are obviously improved. By introducing the maleic anhydride grafting agent, polar groups can be introduced among molecular chains through grafting reaction, so that the hydrogen bond density and crystallinity are remarkably improved, the molecular chains are arranged more regularly, and the tensile strength and heat resistance of the material are improved. The sea-island structure of the polyether ester elastomer effectively absorbs impact energy, so that the elongation at break is greater than or equal to 28%; the nano silicon dioxide inhibits crack propagation, and the service life of the material is remarkably prolonged.

The invention relates to the technical field of aramid fibers, in particular to a heterocyclic aramid fiber and a preparation method thereof.The preparation method comprises the steps that S1, p-phenylenediamine, benzimidazole diamine and terephthaloyl chloride are subjected to a polymerization reaction in an amide solvent, and a polymer stock solution is obtained; s2, the polymer stock solution is subjected to spinning through a spinning nozzle, coagulating bath forming, drafting bath, alkali washing, water bath, drying, hot drafting, oiling and winding into a barrel, and the heterocyclic aramid fiber is obtained. In the step S1, the polymerization reaction temperature is-10 DEG C to 0 DEG C. According to the heterocyclic aramid fiber prepared by the preparation method, the problems of broken filaments, doubled filaments, sticky filaments, broken filaments and the like are obviously improved, the mechanical property is improved, the irregularity is reduced, and the product quality is excellent. The tensile strength of the heterocyclic aramid fiber is 30 to 37 cN / dtex, the elongation at break of the heterocyclic aramid fiber is 3.0 to 4.0 percent, and the elastic modulus of the heterocyclic aramid fiber is 950 to 1150 cN / dtex.

The present invention belongs to the technical field of polyamide 6 synthesis, and relates to a method for inhibiting the formation of infusible cyclic dimers of polyamide 6 and an application thereof. A method for inhibiting the formation of infusible cyclic dimers of polyamide 6 is to add an amino acid in the ring opening stage and the polycondensation stage respectively during the process of synthesizing polyamide 6 from caprolactam by hydrolysis, wherein the amino acid is an amino acid other than aminocaproic acid. An application is to synthesize a polyamide 6 by adopting the method for inhibiting the formation of infusible cyclic dimers of polyamide 6. The present invention reduces the proportion of original infusible cyclic dimers at thermodynamic equilibrium by adding an amino acid at different stages, thereby improving the melt quality, avoiding the influence of infusible cyclic dimers on the melt spinning process, and meeting the processing requirements of direct high-speed spinning.

The invention provides copolymerized flame-retardant nylon containing nitrogen and phosphorus as well as a preparation method and application of the copolymerized flame-retardant nylon. The copolymerized flame-retardant nylon containing nitrogen and phosphorus is formed by copolymerizing a structural unit I and lactam or copolymerizing the structural unit I, diamine and binary acid, the nitrogen and phosphorus-containing copolymerized flame-retardant nylon belongs to a halogen-free flame-retardant environment-friendly high polymer material and is intrinsic flame-retardant nylon, so that the problems of flame retardant migration, compatibility with a base material and the like do not exist, excellent flame-retardant performance can be achieved under the condition of relatively low introduction amount of a flame-retardant structural unit, and meanwhile, excellent mechanical property and spinnability can be kept.

The invention discloses a modified heterocyclic aramid fiber and a preparation method thereof, and belongs to the technical field of high-performance organic fibers. The invention discloses a preparation method of a modified heterocyclic aramid fiber, which comprises the following steps: by taking 2-(4-aminophenyl)-5-aminobenzimidazole, p-phenylenediamine, isophthaloyl chloride and paraphthaloyl chloride as raw materials and LiCl as a catalyst, carrying out polymerization reaction in a solvent to obtain a polymer, and then spinning to obtain the modified heterocyclic aramid fiber. The invention also discloses the modified heterocyclic aramid fiber prepared by the method. According to the invention, m-phthaloyl chloride is creatively used for replacing a part of paraphthaloyl chloride and is subjected to nucleophilic reaction with 2-(4-aminophenyl)-5-aminobenzimidazole and p-phenylenediamine, so that the elongation at break of the fiber can be greatly improved under the condition that the breaking strength and other weather resistance of the original fiber are basically unchanged.

The invention discloses a bio-based fiber reinforced composite material and a preparation method thereof, and belongs to the technical field of bio-based fiber composite materials. The bio-based fiber reinforced composite material is prepared from the following raw materials in parts by weight: 60 to 80 parts of nylon 6, 10 to 20 parts of bio-based aramid fiber, 5 to 10 parts of modified carbon fiber, 2 to 6 parts of hyperbranched polyester modified zinc oxide and 1 to 3 parts of antioxidant, the bio-based aramid fiber is prepared by reacting 2, 5-furandicarbonyl chloride with two diamine monomers, and the two diamine monomers respectively contain trifluoromethyl and sulfuryl; the modified carbon fiber is obtained by grafting polyamidoamine on the surface of carbon fiber; the hyperbranched polyester terminal group of the hyperbranched polyester modified zinc oxide contains an epoxy group. The modified carbon fiber, the bio-based aramid fiber and the hyperbranched polyester modified zinc oxide are added into the nylon matrix, so that the composite material is endowed with good ultraviolet resistance, comprehensive mechanical properties and durability.

The invention discloses a process method for preparing a multi-component aramid copolymer through continuous polymerization, and relates to the technical field of high polymer material preparation, and the process method comprises the following steps: S1, preparing a premix: weighing one or more aromatic diamine monomers according to a certain mass ratio, dissolving the aromatic diamine monomers in an amide solvent or a solvent compounded by amides and hydrotropy salt, and stirring to obtain the premix; uniformly stirring and dissolving in a reaction kettle under the protection of a nitrogen environment to form a premix; s2, low-temperature pre-polycondensation reaction; s3, low-temperature polycondensation reaction; s4, post-treatment: neutralizing, washing and drying the multi-element aramid polymer powder obtained in S3, and removing the solvent and the hydrotropy salt to obtain pure and uniform-particle brown yellow powder; or the obtained polymerization stock solution is neutralized, defoamed and filtered to obtain a spinning stock solution, the intrinsic viscosity of the processed brown yellow powder or spinning stock solution is larger than 4.5 dL / g, the polymer powder / polymerization solution can be used for preparing the multi-element aramid fiber through spinning, and the method effectively reduces the industrial production cost of the multi-element cyclic aramid fiber and improves the production efficiency.

The invention discloses a heteroaromatic polyamide fiber and a preparation method thereof. The preparation method comprises the following steps: carrying out polymerization reaction on a raw material system comprising a diamine monomer containing a heterocyclic structure, an aromatic diacyl chloride monomer and a composite solvent to obtain an aromatic heterocyclic polyamide solution; mixing the heteroaromatic polyamide solution with Lewis acid to prepare a spinning solution; the spinning solution is subjected to gel spinning, gel filaments are obtained, the gel filaments enter a coagulating bath to be coagulated and plasticized and stretched, washing, drying and hot stretching are carried out, and the aromatic heterocyclic polyamide fiber is obtained. The heteroaromatic polyamide fiber prepared by the method is compact in structure and high in orientation degree, and the orientation degree is 0.92-0.97; the mechanical property is excellent, the tensile strength is 33-41 cN / dt, and the elongation at break is 4.2%-6.1%. Compared with traditional wet spinning, the method has the advantages of high spinning speed and high production efficiency, and is suitable for industrial production.

The present invention belongs to the technical field of polymer material preparation, and relates to a method for preparing branched polyamide 6 fibers. The branched polyamide 6 is melt-spun to obtain branched polyamide 6 fibers. By designing the structure of the branched polyamide 6, multiple spaced anchoring points are generated on the molecular chain, and the infusible cyclic dimer is anchored on the branched polyamide 6 molecular chain by hydrogen bonds and van der Waals forces, thereby realizing the uniform dispersion of the infusible cyclic dimer and avoiding the problem of aggregation during processing. Fundamentally, the influence of residual oligomers (especially infusible cyclic dimers) in the melt on the spinning process is solved.

The invention relates to the technical field of high-molecular polymerization and molding, in particular to a modified para-aramid stock solution, a preparation method and para-aramid fibers.The preparation method comprises the steps that under the inert gas condition, diamine and a chlorosilane polycondensation agent react in a weakly-alkaline polar aprotic solvent, and a silanization modified diamine solution is obtained; the diamine comprises diaminodiphenyl ether and p-phenylenediamine; adding paraphthaloyl chloride into the silanization modified diamine solution to carry out a copolymerization reaction, and after the reaction is finished, carrying out neutralization treatment to obtain the modified para-aramid stock solution. According to the preparation method of the modified para-aramid stock solution, the modified diamine does not need to be independently purified, the high-viscosity modified para-aramid stock solution can be directly obtained, and the modified para-aramid stock solution is high in polymer specific concentration logarithmic viscosity and high in molecular weight, so that a high-quality and stable-quality para-aramid fiber product is more favorably obtained.

The invention discloses a waterproof nylon fabric and a preparation method thereof, and belongs to the technical field of nylon preparation. Comprising the following steps: mixing and dispersing a dicarboxylic acid mixed solution and a modified diamine mixed solution according to a weight part ratio of 1: (1-2), adjusting the pH value to 7.0-7.5, heating to 80-90 DEG C, and reacting for 90-110 minutes to obtain a nylon salt solution; the preparation method comprises the following steps: mixing a nylon salt solution and an antioxidant according to a weight ratio of 1: (0.008-0.01), heating to 200-220 DEG C under the protection of a nitrogen atmosphere, and reacting for 2-3 hours to obtain a nylon prepolymer; drying the nylon prepolymer at 70-80 DEG C for 6-10 hours, vacuumizing to 8-10 Pa, heating to 230-240 DEG C, and reacting for 18-20 hours to obtain modified nylon; and mixing the modified nylon and the double-bond-terminated polyurethane prepolymer according to a weight part ratio of (5-8): (2-3) in an extruder, and carrying out melt blending to obtain the waterproof nylon fabric. The waterproof nylon fabric obtained through modification not only has good waterproof performance and air permeability, but also has good waterproof performance and mechanical performance of washing resistance.

The invention relates to the technical field of aramid fibrid production, in particular to an aramid fibrid production device and a use method thereof. The aramid fibrid production device comprises a precipitation machine and a cleaning machine, the cleaning machine comprises a tank body with an opening in the top end, a first annular flange extending outwards is arranged at the top of the tank body, a first filter cylinder is arranged on the upper portion in the tank body, a second filter cylinder is rotationally sleeved with the first filter cylinder, and a barrel-shaped filter bag is sleeved with the second filter cylinder; the upper end face of the second filter cartridge extends out of the first filter cartridge and then is connected with a gear ring, a rotating shaft and a motor for driving the rotating shaft to rotate are rotationally arranged on the first annular flange, a gear meshed with the gear ring is arranged on the rotating shaft, and when the second filter cartridge rotates, filter holes of the first filter cartridge and the second filter cartridge can be mutually staggered to block or communicate. The aramid fibrid stock solution is obtained through the precipitation machine, then the aramid fibrid stock solution is efficiently cleaned through the cleaning machine, and finally the high-quality aramid fibrid is obtained.

The invention provides a dyeable high-temperature-resistant modified meta-position aramid fiber and a preparation method thereof. The modified meta-aramid fiber is mainly prepared from a spinning solution prepared from m-phenylenediamine, methyl 3, 5-diaminobenzoate, 3, 3 '-diaminodiphenyl sulfone and an isophthaloyl dichloride copolymer through dry spinning, and the dye uptake of a disperse dye is not lower than 85%; the thermal decomposition temperature is not less than 400 DEG C. The preparation method comprises the following steps. S1, fully continuous polymerization; s2, continuously neutralizing and conveying; s3, direct spinning; and S4, fiber forming and post-treatment. The method has the advantages that (1) the quality difference between batches in the traditional intermittent method is eliminated, and the uniformity and stability of the product performance are realized; and the preparation process is compact, the production efficiency is high and the energy consumption is low. And (2) the dyeing performance of the prepared fiber is obviously improved, the inherent high-temperature-resistant characteristic of the aramid fiber is maintained, and the mechanical property is excellent. And (3) the application range of the meta-position aramid fiber is expanded.

The invention discloses a preparation method of monoazo colored soft aramid fibers, and belongs to the field of high-performance aromatic polyamide materials. According to the invention, a monomer containing arylether and having a monoazo structure with a color development effect is introduced into a molecular chain to prepare the modified aramid fiber, and the viscosity of a spinning stock solution is 300-500 Po. According to the aromatic polyamide polymer disclosed by the invention, the molecular structure is optimized on the basis of the original polyisophthaloyl metaphenylene diamine, so that the aromatic polyamide polymer has the characteristics of low modulus, high strength and high elongation at break and also keeps excellent flame retardant property, and the color range covers a full chromatogram of 400-700nm. According to the method, the problems of rigidity and brittleness of traditional aramid fibers in processing are solved, and polyamide can obtain different colors according to requirements.

Provided herein is a crosslinked polyaspartic acid or a salt thereof, intermediates thereto, processes of manufacturing them, and articles of manufacture including crosslinked polyaspartic acid or a salt thereof.

The present application relates to the technical field of fibrid, in particular to a bio-based aramid fibrid, a preparation method and application, the preparation method is: S1, after the polymerization reaction of m-phenylenediamine and isophthaloyl chloride in a polar solvent is completed, furan dicarboxylic chloride is added for reaction, and neutralization treatment is carried out to obtain a polymer; S2, the polymer is added to a fibrid agent for fibrid treatment to obtain the bio-based aramid fibrid; the fibrid agent comprises DMAC, water and dichloromethane. In the preparation method of the bio-based aramid fibrid, through the change of chemical modification and fibrid process, the size of the prepared fibrid is concentrated in the range of 0.05-0.1 mm, the beating degree is stable at 80-90 °SR, the prepared fibrid has better combination capacity than short cut fibers, and the index of aramid paper is improved.

The present application relates to the technical field of aromatic polyamide polymer, in particular to a modified poly-p-phenyleneterephthalamide fiber with high elongation at break and a preparation method thereof.The present application introduces a small amount of 3,4'-diamino diphenyl ether and a fourth monomer containing a bis-amino phenoxy functional group during polymerization, and controls the molar ratio of the third monomer and the fourth monomer in the total amount of diamine monomer, thereby to a certain extent, the rigid molecular chain structure of the conventional p-aramid is destroyed, while the breaking strength of the fiber is maintained, the elongation at break of the polymer fiber is enhanced, the modified poly-p-phenyleneterephthalamide can still be prepared by dry spraying wet spinning process, the cost of building a new production line in the factory is saved, the process conditions and parameters are optimized, the fiber with stable elongation at break index is obtained, and the prepared fiber has an elongation at break of more than 3.6%.

A resin sheet is provided that provide both light-weight properties and mechanical strength using a thermoplastic resin with high deflection temperature under load. The resin sheet is formed from a thermoplastic resin, including: a core layer being a foam resin layer; and skin layers located outward of the core layer as determined along the thickness direction, the core and skin layers forming a continuity. The core layer includes a region A1 and regions A2 each located between the region A1 and the associated skin layer. The regions A2 has a lower average porosity than the region A1, the average porosity being lower than 50%. The thermoplastic resin has a deflection temperature under load not lower than 90° C. The resin sheet has a thickness of 1 to 40 mm. Each skin layer has a thickness of 5 to 50% of the thickness of the resin sheet.

The invention provides a copolymerization modified flame-retardant high-strength polyamide 66 fiber and a preparation method thereof. The preparation method comprises the following steps: adding pyridine heterocyclic ring-containing amide salt, aromatic structure amide salt, nylon 66 salt and deionized water into a polymerization kettle as a reaction system; regulating and controlling the temperature and the pressure of a reaction system in an inert gas atmosphere, and carrying out staged reaction to obtain copolymerized modified polyamide 66 slices; the copolymerization modified polyamide 66 slices are subjected to melt extrusion and spinning to obtain the copolymerization modified flame-retardant high-strength polyamide 66 fiber, and the polyamide 66 fiber with high strength and lasting flame-retardant characteristics is prepared by introducing a copolymerization modification scheme containing a pyridine structure and an aromatic structure.

The invention belongs to a resin fiber layered product, and particularly relates to a light-weight high-warm-keeping down jacket fabric and a preparation method of the light-weight high-warm-keeping down jacket fabric. The preparation method comprises the following steps: preparing a modifier from 4, 4 '-diaminodiphenyl sulfone and phenylphosphoryl dichloride as raw materials, mixing the modifier with caprolactam, carrying out a polymerization reaction, carrying out melt spinning and weaving to obtain a modified nylon base cloth layer, forming an electrospun layer on the modified nylon base cloth layer through emulsion electrostatic spinning, and finally carrying out vacuum freeze drying to obtain the down jacket fabric. The light and thin performance and high warm keeping performance of the fabric can be guaranteed, and the breaking strength can be improved.

The invention relates to the technical field of para-aramid fiber production, in particular to a high-strength para-aramid fiber production device and process. A high-strength para-aramid fiber production device comprises a rack, a U-shaped yarn guide frame with a forward opening is arranged at the front end of the rack, a sealing cover is arranged at the top end of the rack in an up-down rotating mode, the yarn guide frame and the sealing cover can define a closed drafting cavity, the yarn guide frame comprises a rear plate connected with the rack, and side plates are arranged on the left side and the right side of the rear plate respectively. A comb-shaped yarn guiding opening is formed in the upper end face of the side plate, a hot tension roller set is arranged in the drafting cavity, a second motor for driving the hot tension roller set to rotate is arranged at the rear end of the rack, and a heating plate is arranged on the sealing cover. The high-strength para-aramid fiber production device is convenient to operate, good in heating stability and good in drafting effect, and the high-strength para-aramid fiber is finally obtained in cooperation with the para-aramid fiber production technology of two times of drafting.

This invention relates to polyamide flat yarns, polyamide container bags, and their preparation methods. The raw materials for production include at least polyamide resin, specifically one or more of polyamide 5X, polyamide 6X, polyamide 6, polyamide 5T / 5X, polyamide 5T / 66, and polyamide 6T / 66. X is selected from one or more of bisaccharide, sebacic acid, undecanoic acid, dodecanoic acid, tridecanoic acid, tetradecanoic acid, pentadecanoic acid, hexadecanoic acid, heptadecanoic acid, and octadecanoic acid. This invention enables the preparation of polyamide flat yarns with higher tensile strength using polyamide resin as a raw material, thereby obtaining polyamide container bags with better tensile strength, dimensional stability, heat resistance, low-temperature resistance, and abrasion resistance.

The invention discloses a modified aramid fiber based on a polyamide solution containing a heterocyclic monomer and a preparation method of the modified aramid fiber, and relates to the technical field of high-performance fiber materials. The aramid fiber is prepared by taking p-phenylenediamine, 2-imidazolyl p-phenylenediamine, terephthaloyl chloride and the like as raw materials, mixing the raw materials according to a specific proportion, preparing a mixed amine solution under the protection of nitrogen, adding the terephthaloyl chloride in batches for polymerization, filtering, defoaming, spinning and the like. The introduction of 2-imidazolyl p-phenylenediamine enhances the intermolecular force through the heterocyclic conjugation effect and the polar effect, and uniform polymerization is ensured by feeding in batches. According to the preparation method, polymerization and spinning processes are optimized, and the comprehensive performance of the aramid fiber is improved.

Provided is a semi-aromatic polyamide fiber having excellent spinning stability, heat resistance and chemical resistance. The semi-aromatic polyamide fiber includes a semi-aromatic polyamide resin having a melting point of 290°C or higher and a plasticizer having a 5% thermal weight reduction temperature of 320°C or higher, the resin having as a dicarboxylic acid component an aromatic dicarboxylic acid unit and as a diamine component 1,9-nonanediamine unit and 2-methyl-1,8-octanediamine unit in a molar ratio (the former: the latter) of 70:30 to 99:1.

This invention relates to the field of bio-based polyamide synthesis technology and discloses a polycondensation preparation process for high-strength bio-based polyamide denim yarn fibers. The process includes: adding bio-based diacid, diamine, and lignin-derived triamine into a reactor and pre-condensing at 210°C to 230°C to generate oligomers; in the deep polycondensation stage, self-flash disturbance is induced by periodically adjusting the vacuum level to drive the uniform migration of branched modified components; when the stirring torque reaches the preset maximum process torque value, vanillic acid monoester is added for end capping. This invention utilizes pulsed pressure fluctuations to break the mass transfer resistance of the high-viscosity system, ensuring uniform distribution of branched nodes throughout the entire domain. The constructed isotropic topological network is based on the shear-thinning characteristics of the product and forms a three-dimensional stress diffusion system in the fibrous state, improving load transfer efficiency and avoiding the risk of fibrillation in denim fabrics under heavy washing conditions.

The invention discloses a long-chain nylon resin, a preparation method thereof and a fabric fiber, the molecular weight of the long-chain nylon resin is tested by gel permeation chromatography, the number-average molecular weight is 20,000-25,000, and the weight-average molecular weight is 37,000-4,000,000; according to the long-chain nylon resin, the number percentage of components with the molecular weight larger than 2 Mw is 8-16%, the number percentage of components with the molecular weight larger than 3 Mw is 3-6%, the molecular weight distribution of the long-chain nylon resin is regulated and controlled through a polymerization technology, and nylon fibers prepared from the long-chain nylon resin have higher strength.

The invention discloses a preparation method of heterocyclic aramid reinforced fibers for a high-performance composite material, and belongs to the technical field of aramid fiber materials. According to the application, the 2-(4-aminophenyl)-5-aminobenzimidazole, the 4-aminopyridine, the 2-chloro-p-phenylenediamine and the 5-aminofuran-2-carboxylic acid are subjected to quaternary copolymerization, so that a progressive synergistic mechanism is constructed. The preparation method comprises the following specific steps: monomer mixing, supercritical microwave polymerization, dry-wet spinning, nitrogen gradient heat treatment, plasma fluorination and coupling agent and nanoparticle surface modification to obtain the heterocyclic aramid reinforced fiber. The limitation that a ternary polymerization system is single in function and insufficient in synergy is solved, and the high-performance heterocyclic aramid reinforced fiber suitable for the fields of aerospace, national defense and military industry and the like is obtained.

The invention belongs to the technical field of papermaking, and relates to aramid paper and a preparation method thereof. According to the preparation method, aramid fibrid and ANF fiber are jointly used as raw materials, and the structural formula of ANF is as follows: # imgabs0 #, in the formula, n: m = (0.1-0.4): (0.6-0.9), m + n = 1, and-X is-F,-Cl,-Br or-I. The basis weight of the finally prepared aramid paper is 60 + / -1 g / m < 2 >, the thickness is 0.062-0.065 mm, the tensile strength is 4.58-5.5 kN / m, the tensile index is 48.1-51 N.m / g, the elongation at break is 7.88-8.9%, the electrical strength is 25-45 kV / mm, the effective diameter of an inhibition zone for staphylococcus aureus is 1.86-1.99 mm, the effective diameter of an inhibition zone for escherichia coli is 2.01-2.45 mm, and the effective diameter of an inhibition zone for candida albicans is 3.77-4.21 mm. The aramid paper has high insulativity and excellent mechanical property and antibacterial property, and the preparation method is simple and suitable for large-scale application.

This invention relates to an antibacterial recycled polyamide 6, its preparation method, and its application, belonging to the field of waste polyamide 6 recycling technology. The preparation method involves a polycondensation reaction of a first polyamide 6 mesopolymer and an antibacterial functional polyamide 6 mesopolymer to obtain the antibacterial recycled polyamide 6. The antibacterial functional polyamide 6 mesopolymer is formed by reacting a second polyamide 6 mesopolymer, an antibacterial monomer, and an end-group modifier. The obtained antibacterial recycled polyamide 6 has a hot water extractable content of 2.0-3.0 wt% and a cyclic dimer content of 0.1-0.5 wt%. The application involves fabricating antibacterial recycled polyamide 6 fibers. The method of this invention is simple, the obtained antibacterial recycled polyamide 6 has a low hot water extractable content, and the antibacterial functional structure in the obtained fibers is stable. The antibacterial effect is long-lasting.