Low-color-difference polyester HOY (high oriented yarn) fibers and preparation method thereof

Abstract

The invention relates to low-color-difference polyester HOY (high oriented yarn) fibers and a preparation method thereof. The low-color-difference polyester HOY fibers are prepared from spun polyester yarn, and the breaking strength of the polyester HOY fibers with high dye uptake is larger than or equal to 3.0 cN / dtex; the elongation at break is 50.0% plus or minus 4.0%, and the color difference delta E is smaller than 0.200. Ethylene glycol magnesium is relatively mild, the thermal degradation coefficient is small, fewer side reactions are caused in the reaction process, and generation of oligomers is reduced in the processing process; the mass percentage of oligomers is smaller than 0.5%, and the mass percentage of diethylene glycol is smaller than 0.5%; the oligomers are reduced in the polymerization process and further reduced in the dissolving process, accordingly, the quantity of the oligomers transferred from the inside of the fibers to the outside of the fibers is reduced in the processes of polyester fiber dyeing and post-processing thermal setting, colored patches and streaks are reduced, and the fiber leveling property and the rubbing fastness are guaranteed. The HOY fibers have lower crystallinity, the breaking elongation is larger and the initial modulus of the fibers is smaller, so that the fibers have good flexibility.

Description

technical field [0001] The invention belongs to the technical field of polyester preparation, and relates to a low-chromatic-difference polyester HOY yarn and a preparation method thereof, in particular to a polycondensation catalyst using a mixture of ethylene glycol magnesium and ethylene glycol antimony and polyester chips washed with water and dissolved The low color difference polyester HOY yarn boiled and washed under the conditions of 120-130 DEG C and 0.2-0.3 MPa and its preparation method. Background technique [0002] Polyethylene terephthalate (PET) is a polymer with excellent properties. PET is widely used for its high modulus, high strength, crispness, good shape retention, purity and hygiene, and good barrier properties. In the fields of fiber, bottle packaging, film and sheet, etc., the output is increasing year by year, and the industry status has been significantly improved. [0003] PET is a symmetrical linear macromolecule, the molecular chain does not co...

AI Technical Summary

Problems solved by technology

When the temperature drops, like dyes, the solubility of oligomers in water decreases sharply with the decrease of temperature, so they will crystallize and precipitate, and the precipitated dyes and oligomers are attached to the surface of the fiber and are not easy to wash off, thus affecting dyeing and post-processing. It brings a lot of trouble. During the dyeing process, the aggregated dyes and oligomers adhere to the surface of the fiber, and dye spots, spots, and color flowers appear.

Deposits in the pipes and valves of the dyeing machine, hindering the circulation of the liquid flow, resulting in difficulty in dyeing

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