A polyamide 46 multifilament has a strength of 6.0 to 9.0 cN/dtex and an elongation at break of 15% to 30%, an elongation rate (E′10) of less than 2.5% after heat treatment at 120° C. for 24 hours and subsequent stretching performed 10 times in a room temperature environment, and the difference (E′10-E′1) between the elongation rate (E′1) of the heat-treated fiber measured after stretching it once in a room temperature environment and its elongation rate (E′10) measured after stretching it ten times in a room temperature environment is less than 0.60%.

A polyamide 46 multifilament has a strength of 6.0 to 9.0 cN/dtex and an elongation at break of 15% to 30%, an elongation rate (E′10) of less than 2.5% after heat treatment at 120° C. for 24 hours and subsequent stretching performed 10 times in a room temperature environment, and the difference (E′10-E′1) between the elongation rate (E′1) of the heat-treated fiber measured after stretching it once in a room temperature environment and its elongation rate (E′10) measured after stretching it ten times in a room temperature environment is less than 0.60%.

A temperature regulating nylon fiber includes a fiber body and a phase change composition. The phase change composition is doped in the fiber body and includes 450 parts by weight to 550 parts by weight of a polytetrahydrofuran derivative and 5 parts by weight to 20 parts by weight of a succinic anhydride derivative. Based on 100 parts by weight of the temperature regulating nylon fiber, a content of the phase change composition is between 6 parts by weight and 12 parts by weight.

Provided are nylon fibers having fire-retardant agents dispersed therein and methods for manufacturing such fibers. The fire-retardant agents may comprise Tris(tribromophenyl) triazine and/or antimony trioxide. Fabrics made from such fibers are also provided.

Provided are nylon fibers having fire-retardant agents dispersed therein and methods for manufacturing such fibers. The fire-retardant agents may comprise Tris(tribromophenyl) triazine and/or antimony trioxide. Fabrics made from such fibers are also provided.

The present disclosure relates to polymer resins, fibers, and yarns with permanent antimicrobial activity, and a method of producing the same. In one embodiment, the antimicrobial polymer resin comprises a polymer having less than 2500 ppm of zinc dispersed within the polymer, less than 1000 ppm of phosphorus, wherein the weight ratio of zinc to phosphorus is at least 1.3:1 or less than 0.64:1.

A method for preparing a carbon nanodot-fluorescent polymer composite includes subjecting a reactant and a biological component to a reaction at 260° C. to 290° C., so as to obtain the carbon nanodot-fluorescent polymer composite containing a polymer and carbon nanodots dispersed in the polymer. The biological component includes at least one of collagen, chitin, gelatin, and sodium alginate. The reactant is selected from a reaction component or a polycondensate formed therefrom. The reaction component includes terephthalic acid having carboxylic acid groups and ethylene glycol capable of reacting with such groups. Also disclosed are the carbon nanodot-fluorescent polymer composite and a carbon nanodot-fluorescent composite fiber including the same.

A high-strength polyamide 610 multifilament has a sulfuric acid relative viscosity of 3.0 to 3.7 and a drying strength of more than 9.2 cN/dtex and within 11.0 cN/dtex, having a total fineness of 100 to 2,500 dtex and a single fiber fineness of 1.5 to 40 detex and a birefringence Δn of 50.0 x 10.sup.-3 or more.

Disclosed are an industrial polyamide yarn, a preparation method therefor, and the use thereof. The raw materials for producing the industrial polyamide yarn include at least 1,5-pentanediamine and a linear aliphatic dibasic acid; or polyamide 5X obtained by the polymerization of 1,5-pentanediamine and a linear aliphatic dibasic acid as monomers. The industrial polyamide yarn according to an embodiment has the characteristics of a low water absorption, a good dimensional stability, a high fracture strength, and a good heat resistance.

Disclosed are an industrial polyamide yarn, a preparation method therefor, and the use thereof. The raw materials for producing the industrial polyamide yarn include at least 1,5-pentanediamine and a linear aliphatic dibasic acid; or polyamide 5X obtained by the polymerization of 1,5-pentanediamine and a linear aliphatic dibasic acid as monomers. The industrial polyamide yarn according to an embodiment has the characteristics of a low water absorption, a good dimensional stability, a high fracture strength, and a good heat resistance.