40results about "Monocomponent copolyamides artificial filament" patented technology

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.

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%.

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 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 present invention relates to para-aramid staple fibers having improved cut resistance due to the use of high elongation yarn of 4% or more, and a method for producing aramid spun yarn using the same.

The present application relates to the technical field of high-performance fiber materials, and particularly relates to a high-strength and high-elongation meta-aramid short-cut fiber and a preparation method thereof, the preparation method being as follows: meta-phenylenediamine, 1,3-bis(4'-aminophenoxy)benzene and isophthaloyl chloride are reacted in a solvent to obtain an oligomer A solution; p-phenylenediamine, 1,4-bis(4'-aminophenoxy)benzene and terephthaloyl chloride are reacted in a solvent to obtain an oligomer B solution; meta-phenylenediamine, the oligomer A, the oligomer B and isophthaloyl chloride are subjected to a polymerization reaction in a solvent to obtain a polymerization stock solution; an alkaline earth metal hydroxide is used to adjust the pH of the polymerization stock solution to weak alkalinity to obtain a spinning stock solution; and the spinning stock solution is subjected to wet spinning and cutting treatment to obtain the meta-aramid short-cut fiber. The meta-aramid short-cut fiber simultaneously achieves excellent performance of a breaking strength of greater than or equal to 4.5 cN / dtex and an elongation at break of greater than or equal to 40%.

The application relates to the technical field of fiber materials, and provides high-flame-retardant aramid fibers and a preparation method. An inorganic salt is dissolved in a solvent, and p-phenylenediamine is added to obtain a main monomer solution; a phosphorus-containing aromatic difunctional monomer and a silicon-containing aromatic difunctional monomer are dissolved in a solvent to obtain a flame-retardant comonomer solution; p-phthaloyl chloride is added to the main monomer solution to perform a prepolymerization reaction, and a prepolymer solution is obtained; the flame-retardant comonomer solution is added to the prepolymer solution, and p-phthaloyl chloride is added to perform a polycondensation reaction, and a copolymerized p-aramid polymer is obtained; the copolymerized p-aramid polymer is separated, washed, dried, and dissolved in concentrated sulfuric acid to obtain a spinning solution, and the high-flame-retardant p-aramid fibers are obtained after the spinning solution is post-treated. The phosphorus-containing aromatic difunctional monomer and the silicon-containing aromatic difunctional monomer are introduced in the aramid polymerization process, and the copolymerized p-aramid fibers with flame retardance and fiber-forming property are obtained.

This invention belongs to the field of synthetic fiber materials technology, and discloses a PA66-PA6S copolyamide material, its preparation method, and its applications. Sodium isophthalic acid-5-sulfonate and hexamethylenediamine were used as raw materials, and sodium isophthalic acid-5-sulfonate hexamethylenediamine salt was successfully prepared through a neutralization reaction. This salt was then polymerized with hexamethylenediamine adipic acid salt to obtain the PA66-PA6S copolyamide. Compared with pure PA66, the copolymer sample showed improved thermal stability and spinnability. When the proportion of sodium isophthalic acid-5-sulfonate hexamethylenediamine salt was not higher than 2 mol%, the tensile strength of the material did not change significantly, while the elongation was more pronounced. Compared with conventional PA66, the PA66-PA6S modified fiber exhibited significant advantages in color depth, color brightness, and color fastness to washing.

The invention discloses a preparation method of anthraquinone colored soft aramid fibers, and belongs to the field of high-performance aromatic polyamide materials. Monomers containing aryl ether and having an anthraquinone structure with a color development effect are 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.

The present application relates to fibers having a diameter of 1 nm to 10,000 nm, of one or more biocompatible polymers, wherein the polymers have a backbone which includes a positively charged component from a zwitterionic moiety. Additionally, this application discloses an implantable therapeutic delivery system and its method of formation, comprising a housing defining a chamber, wherein said housing is porous and formed from the fibers. Inside of the housing includes a preparation of cells which release a therapeutic agent from the chamber. The implantable therapeutic delivery system can be used in the treatment of diabetes.

The invention discloses a preparation method of bisazo 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 bisazo 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 200-400 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.

The invention discloses application of a PA material in a composite rubber tube and a preparation method of the PA material. The used raw materials comprise butyl rubber, ethylene propylene diene monomer, lysine modified PA fibers and other auxiliaries. The preparation method of the PA material comprises the following steps: 1) preparing a lysine modified PA melt; (2) preparing non-oriented yarns; and (3) preparing the lysine modified PA fiber. The preparation method comprises the following steps: firstly, synthesizing amino-terminated and side-chain amino polyamide, reacting with bismaleimide twice in stages to obtain high-strength lysine modified PA fibers capable of being crosslinked with butyl rubber and ethylene propylene diene monomer, and carrying out thickness collaborative design on a fiber reinforced layer and a rubber layer to obtain the high-strength lysine modified PA fibers. The breakthrough of fiber strengthening and toughening, no slippage defect in interface connection and high medium resistance is achieved, the strong acid corrosion resistance, the high-pressure pulse service life and the mechanical strength of the rubber pipe are remarkably improved, and the rubber pipe is suitable for occasions such as cooling liquid pipelines, fuel oil pipelines and hydraulic systems which have high requirements for pipelines.

The invention relates to the technical field of nylon fiber preparation, and provides an antibacterial nylon 6 fiber preparation method, which comprises: preparing a solution A; preparing a solution B; the preparation method comprises the following steps: preparing a copper-tea polyphenol complex Cu-TP; preparing a hyperbranched polyamide solution; carrying out grafting reaction to generate a complex microbial inoculant; preparing a solid complex microbial inoculant; preparing modified antibacterial nylon 6 slices; preparing antibacterial nylon 6 fibers; and S7, preparing the antibacterial nylon 6 fiber from the modified antibacterial nylon 6 slices prepared in the step S7 through an extrusion process. Therefore, the complex microbial inoculant is fixed on a molecular chain of nylon 6 through a chemical bond by virtue of a polymerization reaction. Compared with the prior art, the complex microbial inoculant disclosed by the invention is firmly combined in a parent material, is not easy to migrate, and replaces physical dispersion, so that the complex microbial inoculant is uniformly dispersed in the parent material, and the antibacterial effect and the antibacterial durability of the material are improved. The invention also provides a fabric and clothes.

The invention relates to the technical field of high-performance polymer fiber manufacturing, in particular to a low-processing-viscosity liquid crystal polyarylester fiber and a preparation method thereof.The preparation method comprises the steps that S1, p-hydroxybenzoic acid and 2-hydroxy-6-naphthoic acid serve as monomers, and an acetylation reaction is conducted in the presence of an acetylation reagent and a catalyst; the preparation method comprises the following steps: firstly, preparing LCP resin, then carrying out melt polycondensation reaction, adding 6-acetoxy-2-naphthoic acid at the later stage of the melt polycondensation reaction, stirring and dispersing, discharging, cooling and granulating to obtain the LCP resin; and S2, carrying out melt spinning and heat treatment on the LCP resin to obtain the liquid crystal polyarylate fiber. According to the preparation method, the melt processing viscosity of the resin can be remarkably reduced, the production smoothness is improved, the heat treatment time is shortened, the production energy consumption is reduced, the high molecular weight potential of the resin in spinning processing is not influenced, and the liquid crystal polyarylate fiber is ensured to have very good strength performance.

This invention discloses a heterocyclic polyarylamide-polyhydroxyarylamide precipitated fiber, its preparation method, and a heterocyclic polyarylamide-polybenzodioxazole paper, belonging to the technical field of high-performance organic fiber and paper preparation. The preparation method of the precipitated fiber includes the following steps: A. Preparation of the polymerization solution: 3,3'-dihydroxybenzyl diamine (DHB) and 2-(4-aminophenyl)-5-aminobenzimidazole (DAPBI) are dissolved in an organic solvent containing a solubilizing salt, and then terephthaloyl chloride is added to react and obtain a polymer solution with a solid content of 1-10%; B. Precipitation: After degassing, filtering, metering, and spinning, the polymer solution is mixed with a coagulation bath and precipitated to obtain the heterocyclic polyarylamide-polyhydroxyarylamide precipitated fiber. A heterocyclic polyarylamide-polybenzodioxazole paper prepared from this precipitated fiber is also provided. This invention introduces a heterocyclic polyaromatic amide structure through copolymerization, which not only improves the strength and composite properties of the cyclized PBO paper, but also maintains a decomposition temperature comparable to that of pure PBO fiber, exceeding 600℃, demonstrating excellent thermal stability. Furthermore, this method is simple and easy to implement, making it suitable for industrial production applications.

The application discloses a modified aramid fiber based on a polyamide solution containing a heterocyclic monomer and a preparation method thereof, and relates to the technical field of high-performance fiber materials. The aramid fiber is prepared from p-phenylenediamine, 2-imidazolyl p-phenylenediamine, p-phthaloyl chloride and the like as raw materials, a mixed amine solution is prepared under nitrogen protection, p-phthaloyl chloride is added in batches for polymerization, and then filtering, defoaming and spinning are performed to obtain the aramid fiber. The introduction of 2-imidazolyl p-phenylenediamine enhances the intermolecular force through the heterocyclic conjugation effect and the polarity effect, and the batch feeding ensures the uniform polymerization. The preparation method optimizes the polymerization and spinning process and improves the comprehensive performance of the aramid fiber.

The invention relates to a hollow fiber and yarn. The hollow fiber is provided with a square hollow core part and blades, and the outer surface of the core part is square; the number of the blades is eight, and the blades are located at the four corners and the middle positions of the four edges of the square of the outer surface of the core part respectively. The blades protrude outwards along the straight line where the center point of the hollow fiber and the connecting points of the blades and the outer surface of the core part are located. The fiber disclosed by the invention can keep a good hollow rate in the use process, and the thermal insulation and moisture absorption of the fiber can be always kept at a better level.

The present application belongs to the technical field of fiber preparation, and relates to a kind of p-aramid fiber, p-aramid aerogel fiber and respective preparation methods thereof.The preparation method of p-aramid fiber is to spin p-aramid solution to obtain p-aramid fiber, wherein p-aramid is prepared by the reaction of p-phenylenediamine, 2,3-difluoro-p-phenylenediamine and terephthaloyl chloride.The preparation method of p-aramid aerogel fiber is to first prepare p-aramid fiber dispersion, then perform wet spinning to obtain p-aramid hydrogel fiber, and then dry the p-aramid hydrogel fiber to obtain p-aramid aerogel fiber.The present application simultaneously solves the three major pain points of traditional fiber, i.e., light dyeing, weak strength and poor water resistance, and provides technical support for the multi-scenario application of high-performance fibers.

The invention provides a reactive heterocyclic aromatic polyamide polymer, an aramid fiber, a preparation method and application. The reactive heterocyclic aromatic polyamide polymer is mainly formed by carrying out copolycondensation on p-phenylenediamine, 2, 5-diaminopyridine, terephthaloyl chloride and acyl chloride A containing a halogenated group in a solvent; the preparation method of the polymer comprises the following steps: mixing and dissolving the cosolvent and the solvent; adding p-phenylenediamine and 2, 5-diaminopyridine, and cooling to-20 to 0 DEG C; and adding terephthaloyl chloride and acyl chloride A containing a halogenated group, and neutralizing a byproduct generated by the polymerization reaction by using an acid-binding agent to obtain a reactive heterocyclic aromatic polyamide polymer solution. And preparing the reactive heterocyclic polyamide polymer solution into the reactive heterocyclic aramid fiber through a dry-jet wet spinning process. A heterocyclic ring structure and a halogenated aromatic ring structure are introduced into a main chain of the prepared reactive heterocyclic aramid fiber, so that reaction conditions are provided for subsequent functional modification, and the application field is expanded.

This invention relates to the field of nylon, providing a method for preparing intrinsically fast-drying and moisture-wicking nylon chips and their application in nylon. The method includes the following steps: adding a dicarboxyl monomer and a diamine to caprolactam monomer or PA66 nylon salt, and polymerizing to obtain fast-drying and moisture-wicking nylon chips; the polymerization reaction includes sequential prepolymerization below 160°C, prepolymerization under pressure at 220-260°C, and polycondensation at 240-280°C; the dicarboxyl monomer contains hydrophilic side groups, which do not chemically react with carboxyl or amino groups in this reaction. Introducing modified functional groups into the conventional nylon molecular structure through copolymerization endows nylon fabrics with excellent moisture-wicking and quick-drying properties. Through copolymerization modification, the material's inherent properties are altered, resulting in significant and long-lasting effects.

The invention discloses a heterocyclic aramid liquid crystal spinning stock solution as well as a production process and application thereof, a p-phenylenediamine monomer, a heterocyclic diamine monomer and a terephthaloyl chloride monomer are subjected to low-temperature condensation polymerization in a reaction kettle to prepare a polymer solution, and then the polymer solution is filtered and defoamed; extracting, washing and drying the filtered and defoamed polymer solution to obtain gel filaments; mechanically cutting the gel filaments to obtain chopped fibers, and then drying the prepared chopped fibers; the dried fibers are chopped and dissolved in a strong acid solvent, and the heterocyclic aramid liquid crystal spinning solution is obtained. By optimizing the existing preparation process of the heterocyclic aramid fiber, the production energy consumption can be remarkably reduced, the production efficiency is improved, and the production cost of the fiber is effectively reduced. The technical breakthrough can promote large-scale application of the heterocyclic aramid fibers in a wider market field.