99results about "Monocomponent copolyamides artificial filament" patented technology

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 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 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 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 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.

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.

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.

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.

The invention discloses a high-elongation ternary aramid fiber and a preparation method and application thereof.The preparation method comprises the steps that 3, 4 '-diaminodiphenyl ether and p-phenylenediamine are jointly dissolved in a composite solvent composed of N-methyl pyrrolidone and calcium chloride according to a specific molar ratio, and the high-elongation ternary aramid fiber is obtained through a multi-stage temperature control and stepped rotating speed twin-screw continuous polycondensation process; adding paraphthaloyl chloride step by step to realize controllable polymerization so as to form a polymer solution; and neutralizing, defoaming and filtering the polymer solution to obtain a spinning solution, and carrying out dry-jet wet spinning to obtain the ternary aramid fiber. According to the method, continuous polymerization and solution dry-jet wet spinning are combined, and the solid content of the spinning solution is increased, so that the fiber has the advantages of high strength and high toughness, the spinning speed is increased, and the production cost is reduced. A flexible ether bond is introduced into a terpolymer structure, so that the original highly regular crystal structure of the para-aramid fiber is destroyed, and a molecular chain is easier to relatively slide and deform when being stressed, so that the extensibility of the fiber is improved.

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.

A polyamide polymer of a dicarboxylic acid, a diamine, and an aminoalkylcarboxylic acid, said polyamide polymer characterized in that itaconic acid is used as the dicarboxylic acid, a diamine represented by formula (I) is used as the diamine (formula (I): H2N-R1-NH2, wherein R1 represents an alkylene group having 4-12 carbon atoms), and an aminoalkylcarboxylic acid represented by formula (II) is used as the aminoalkylcarboxylic acid (formula (II): HOOC-R2-NH2, wherein R2 represents an alkylene group having 8-12 carbon atoms).

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.

A high-strength polyamide 610 multifilament characterized by having a sulfuric acid relative viscosity of 3.0-3.7 and a drying strength of more than 9.2 cN / dtex and within 11.0 cN / dtex. A high-strength polyamide 610 multifilament is provided.