Low-content organic volatile low-melting-point polyester fiber and preparation method thereof

Abstract

The invention relates to a low-content organic volatile low-melting-point polyester fiber and a preparation method thereof. The preparation method comprises the steps of taking terephthalic acid, phthalic acid, ethylene glycol, diethylene glycol, isophthalic acid sulfonate and 1, 4-butanediol as raw materials to prepare low-content organic volatile low-melting-point polyester, and then taking theprepared polyester as a sheath layer material and taking PET as a core layer material to prepare the low-content organic volatile low-melting-point polyester fiber through sheath-core composite spinning (a metal sand material in an assembly is Ni); and adding zinc oxide in an esterification reaction stage. The fiber has a sheath-core composite structure, and the sheath layer material is the low-content organic volatile low-melting-point polyester (a molecular chain is composed of a phthalic acid chain segment, an ethylene glycol chain segment, a diethylene glycol chain segment, an isophthalicacid sulfonate chain segment and a 1, 4-butanediol chain segment), and the core layer material is PET; and the total content of acetaldehyde and butenal in the fiber is less than 0.5 ppm. The method reduces the influence of organic volatile on fibers and avoids the problem of fiber adhesion.

Description

technical field [0001] The invention belongs to the technical field of polyester fibers, and relates to a polyester fiber with low content of organic volatiles and low melting point and a preparation method thereof. Background technique [0002] Polyester fiber is durable, wrinkle-resistant and crisp, has good washability and wearability, and is widely used. It is one of the synthetic fibers with the largest demand and the fastest development speed. Low melting point polyester is a new type of modified polyester that lowers the melting point (melting point at 100-210°C) by adding a variety of modifying components during the polymerization of ordinary polyester to change the molecular structure of PET. Low-melting point polyester is widely used in the production of non-woven fabrics for clothing or electrical insulation non-woven fabrics. The fibers made from it are mixed in ordinary polyester fiber nets, and only need to be heated to its melting point to produce bonding. Aft...

AI Technical Summary

Problems solved by technology

[0004] Moreover, ethylene glycol as a raw material for polyester synthesis contains tens of ppm of hydrogen sulfide (residual in petrochemical or coal chemical industry). For a long time, hydrogen sulfide will cause corrosion to polymerization equipment and cause catalyst poisoning in the polymerization process ( generate antimony sulfide, which reduces the effective content of the catalyst); therefore, in order to make the polymerization proceed smoothly, the amount of catalyst used is usually increased, which affects the polyester from two aspects: one is that the antimony sulfide is yellow and will enter the polyester In the ester, the color is affected (the b value is increased); the second is the increase of the catalyst, which increases the content of antimony in the polyester

In addition, a series of side reactions will occur during the esterification and polycondensation reaction of low-melting polyester, resulting in many by-products, among which crotonaldehyde and acetaldehyde are the most influential, both of which will cause physical symptoms

This has an adverse effect on the application of low-melting point polyester, especially limiting its application in automobiles and closed environments; and acrolein and acetaldehyde, as by-products of the polymerization reaction, cannot be completely eliminated in the polymerization

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