11results about "Monocomponent copolyamides artificial filament" patented technology

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.

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 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.

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.

Problem: To provide a polyamide-imide resin that enables stable spinning of a nanofiber having a small diameter, a polyamide-imide fiber formed from the polyamide-imide resin, and a nonwoven fabric including the polyamide-imide fiber. Solution: A polyamide-imide resin including a constitutional unit derived from an organic acid salt compound.

The present application relates to superfine aramid nanofiber and a method for preparing the same. The superfine aramid nanofiber of the present application comprises a polyamide obtained by copolymerization of a p-phenylenediamine monomer, a heterocyclic diamine monomer and p-phthaloyl chloride, wherein the heterocyclic diamine monomer comprises one or more structures selected from benzoxazole, benzofuran or benzothiophene, and the superfine aramid nanofiber has an average diameter of 5-20 nm. The superfine aramid nanofiber of the present application has a small diameter and excellent dispersion stability in various media.

The present invention relates to a method for producing nylon, said method comprising the steps of providing a nylon-base material, said nylon-base material being sulfonated in the polymer backbone and / or on polymer amine-end groups, said nylon-base material comprising a sulfur content of at least 200 ppm; mixing the nylon-base material with at least an additive, said additive comprising an amine-end group terminating agent and / or a sulfonating agent, and optionally at least one further additive; thereby obtaining a nylon polymer mixture and reacting the nylon polymer mixture thereby obtaining a nylon polymer, said nylon polymer being characterized by a lower amine-end group content than the content of amine-end group of the nylon-base material. The present invention further relates to a method for producing nylon-base material. In another aspect, the present invention relates to a nylon-base material. In another aspect, the present invention relates to a nylon polymer.