The invention relates to low-color-difference
polyester wool-like different-shrinkage complex
yarn and a preparation method thereof. The low-color-difference
polyester wool-like different-shrinkage complex
yarn is prepared through carrying out
fiber intermingling on low-color-difference
polyester POY (Pre-Oriented
Yarn) and low-color-difference polyester FDY (Fully Drawn
Yarn), wherein the low-color-difference polyester POY forms small
yarn loops which surround the low-color-difference polyester FDY; the low-color-difference polyester POY and the low-color-difference polyester FDY are made from polyester through carrying out dissolving and washing and then carrying out
spinning. The low-color-difference polyester
wool-like different-shrinkage complex yarn has the rupture strength not lower than 3.0cN / dtex, the breaking elongation of 40.0+ / -3.0%, the
crimp contraction of 5.50+ / -3.0%, the interlacing degree of 95+ / -5 / m, the
fiber number of 150dtex to 300dtex and the
color difference [
delta]E smaller than 0.200. According to the low-color-difference polyester wool-like different-shrinkage complex yarn and the preparation method thereof,
ethylene glycol
magnesium is relatively mild and has a very small thermal degradation coefficient, and the oligomers are reduced during
polymerization and are further reduced during washing, so that during the
dyeing and postprocessing thermosetting of polyester fibers, the amount of the oligomers migrating to the outside of the fibers from the inside is reduced, the occurrence of color spots and streaks is reduced, and the level dyeability and
rubbing fastness of the fibers are guaranteed.