Provided are a polycarbonate fiber having a specific orientation degree and/or a specific birefringence value, a fiber structure as well as a resin composite body. The polycarbonate fiber may have an orientation degree (ft) of lower than 0.70, the orientation degree (ft) being defined by the following formula: ft=1−(1.0/C).sup.2, C: obtained sonic velocity (km/sec), and may have a birefringence value of 0.04 or lower. The polycarbonate fiber may comprise a polycarbonate resin having a number-average molecular weight (Mn) of from 12000 to 40000 and/or a weight-average molecular weight (Mw) of from 25000 to 80000.

Provided are a polycarbonate fiber having a specific orientation degree and/or a specific birefringence value, a fiber structure as well as a resin composite body. The polycarbonate fiber may have an orientation degree (ft) of lower than 0.70, the orientation degree (ft) being defined by the following formula: ft=1−(1.0/C).sup.2, C: obtained sonic velocity (km/sec), and may have a birefringence value of 0.04 or lower. The polycarbonate fiber may comprise a polycarbonate resin having a number-average molecular weight (Mn) of from 12000 to 40000 and/or a weight-average molecular weight (Mw) of from 25000 to 80000.

A reusable protective clothing, including parameters of: (1) anti-permeability water pressure being: hydrostatic pressure of a new protective clothing ≥1100 cm H.sub.2O, and hydrostatic pressure after 100 times of repeated use ≥40 cm H.sub.2O; (2) moisture permeability of a material used ≥2500 g/(m.sup.2.Math.d), moisture permeability after 20 times of repeated use ≥5000 g/(m.sup.2.Math.d), and moisture permeability after 100 times of repeated use ≥8000 g/(m.sup.2.Math.d); (3) synthetic blood penetration resistance ≥grade 2 in table 3 of GB19082-2009; (4) outer surface water spray grade ≥grade 3; (5) breaking strength ≥45 N; (6) elongation at break ≥15%; (7) filtration efficiency for non-oily particles ≥70%; (8) charge amount ≤0.6 μC/piece; (9) static decay time ≤0.5 second; (10) continuous burning time ≤15 seconds, smoldering time ≤10 seconds, damage length less than 20 mm.

A reusable protective clothing, including parameters of: (1) anti-permeability water pressure being: hydrostatic pressure of a new protective clothing ≥1100 cm H.sub.2O, and hydrostatic pressure after 100 times of repeated use ≥40 cm H.sub.2O; (2) moisture permeability of a material used ≥2500 g/(m.sup.2.Math.d), moisture permeability after 20 times of repeated use ≥5000 g/(m.sup.2.Math.d), and moisture permeability after 100 times of repeated use ≥8000 g/(m.sup.2.Math.d); (3) synthetic blood penetration resistance ≥grade 2 in table 3 of GB19082-2009; (4) outer surface water spray grade ≥grade 3; (5) breaking strength ≥45 N; (6) elongation at break ≥15%; (7) filtration efficiency for non-oily particles ≥70%; (8) charge amount ≤0.6 μC/piece; (9) static decay time ≤0.5 second; (10) continuous burning time ≤15 seconds, smoldering time ≤10 seconds, damage length less than 20 mm.

An artificial hair fiber suppressed in formation of nodes is provided. An artificial hair fiber is structured with a fiber of drawn resin composition; wherein: when an initial tensile stress of undrawn fiber at 100° C. is taken as F0, and a tensile stress when drawn by 2.5 times is taken as F1, F1/F0 of an undrawn fiber obtained by spinning the resin composition is 1.2 or more.

A type of polyester yarn for an industrial sewing thread and preparing method thereof are provided. The preparing method is composed of a viscosity enhancing by a solid state polycondensation and a melt spinning for a modified polyester, and the modified polyester is a product of esterification and polycondensation of evenly mixed terephthalic acid, ethylene glycol, tert-butyl branched dicarboxylic acid, trimethylsilyl branched diol and a doped Sb.sub.2O.sub.3 powder, wherein the tert-butyl branched dicarboxylic acid is selected from the group consisting of 5-tert-butyl-1,3-benzoic acid, 2-tert-butyl-1,6-hexanedioic acid, 3-tert-butyl-1,6-hexanedioic acid and 2,5-di-tert-butyl-1,6-hexanedioic acid. Moreover, the modified polyester is dispersed with a doped ZrO.sub.2 powder. An obtained fiber has an intrinsic viscosity drop of 23-28% when stored at 25° C. and R.H. 65% for 60 months.

A high-strength high-modulus graphene/nylon-6 fiber and a preparation method thereof are provided. The fiber is obtained through processing modified graphene and caprolactam with in situ polymerization and high-speed melt spinning. A graphene/nylon-6 composite is provided, which is obtained through compositing the modified graphene, the caprolactam and an additive. Based on the composite, a graphene/nylon-6 fabric with a permanent far-infrared healthcare function and a graphene/nylon-6 fabric with an ultraviolet protective property are provided, whose far-infrared property and ultraviolet protective property will not be attenuated due to an increase of fabric washing times, having a great market potential.

A high-strength high-modulus graphene/nylon-6 fiber and a preparation method thereof are provided. The fiber is obtained through processing modified graphene and caprolactam with in situ polymerization and high-speed melt spinning. A graphene/nylon-6 composite is provided, which is obtained through compositing the modified graphene, the caprolactam and an additive. Based on the composite, a graphene/nylon-6 fabric with a permanent far-infrared healthcare function and a graphene/nylon-6 fabric with an ultraviolet protective property are provided, whose far-infrared property and ultraviolet protective property will not be attenuated due to an increase of fabric washing times, having a great market potential.

The present invention discloses a highly effective flame-retardant lightweight and soft multi-fiber blended fabric and a preparation method thereof. The fabric comprises 82 to 87 wt % of base fabric, 5 to 8 wt % of flame retardant and 8 to 10 wt % of antistatic agent. The base fabric comprises 45 to 48 wt % of polyacrylonitrile fibers, 40 to 42 wt % of cellulose fibers, 6 to 9 wt % of polyacrylate fibers and 6 to 8 wt % of polyamide fibers in parts by mass. The material has the characteristics of highly effective flame retardance, lightweightness and softness, with the gram weight being 215 g/m. A test shows that the material can come up to the NFPA2112 standard, and the arc-proof ATPV is greater than 8 cal/cm.sup.2.

The present invention discloses a highly effective flame-retardant lightweight and soft multi-fiber blended fabric and a preparation method thereof. The fabric comprises 82 to 87 wt % of base fabric, 5 to 8 wt % of flame retardant and 8 to 10 wt % of antistatic agent. The base fabric comprises 45 to 48 wt % of polyacrylonitrile fibers, 40 to 42 wt % of cellulose fibers, 6 to 9 wt % of polyacrylate fibers and 6 to 8 wt % of polyamide fibers in parts by mass. The material has the characteristics of highly effective flame retardance, lightweightness and softness, with the gram weight being 215 g/m. A test shows that the material can come up to the NFPA2112 standard, and the arc-proof ATPV is greater than 8 cal/cm.sup.2.