This invention discloses a modified
spinning method for high-
toughness 1600D ultra-high molecular weight
polyethylene fiber, belonging to the field of high-performance
polyolefin fiber preparation technology. The method includes: sieving, demagnetizing, and
vacuum drying ultra-high molecular weight
polyethylene resin; preparing an interface bridging modifier
mother liquor using coupled modified nano-
inorganic particles, grafted
polyethylene wax, low-melting-point α-olefin
copolymer,
antioxidant stabilizing components, and a portion of
spinning solvent; subjecting the
mother liquor, resin, and
spinning solvent to staged pre-swelling through low-temperature
wetting and medium-temperature shearing, followed by high-temperature
dissolution,
filtration, and degassing to form a modified gel spinning solution; and subjecting the spinning solution to dry-jet wet spinning, gradient coagulation, multi-stage extraction, controlled
drying, pre-orientation, multi-stage hot stretching, online tension and
linear density closed-loop correction, and micro-relaxation
heat setting to obtain ultra-high molecular weight polyethylene
fiber with a
linear density of 1600D. This method disperses the nanophase in the gel
system at a flexible
polyolefin interface, and, in conjunction with the orientation and
residual stress control of the coarse denier filament bundles, can reduce agglomeration defects and differences in orientation between inner and outer
layers, thereby improving fiber fracture work, bending resistance and
linear density stability.