Low-melting-point spandex slice

Abstract

The invention discloses a low-melting-point spandex slice which comprises the following raw materials in parts by weight: 25-55 parts of side-methyl-containing polyester diols with the molecular weight of 2000-3000; 15-45 parts of polyether diols with the molecular weight of 1000-2000; 15-45 parts of diisocyanate; 5-15 parts of a chain extender, wherein the chain extender is dihydric alcohol withthe molecular weight of 80-140; 0.1-1.0 part of an antioxidant; 0.1-1.0 part of a lubricant; and a catalyst, wherein the weight of the catalyst accounts for 0.01-0.1% of the total weight of the otherraw materials. According to the invention, the molecular weight and the type of the polyester polyol are controlled and the aggregation state structure of the soft segment phase is controlled, so thatthe melting point of the spandex slice is controlled; and the high resilience of the spandex slice is controlled by controlling the type of the chain extender and adjusting the aggregation state structure of the hard segment phase. Under the comprehensive action of the raw material substances, the DSC melting point of the prepared spandex slice is reduced to be less than 130 DEG C, so that the spandex yarns prepared by using the spandex slices can be subjected to heat shaping at a low temperature, and the the spandex yarns can be blended and woven with other heat-sensitive fibers such as nylon, real silk, wool, polypropylene fiber, rayon, poly(trimethylene terephthalate) fibers to prepare high-grade clothing and the like.

Description

technical field [0001] The invention relates to the technical field of thermoplastic polyurethane materials, in particular to a low melting point spandex slice. Background technique [0002] Spandex fiber, referred to as spandex, is a fiber with high resilience. It is widely used in underwear such as shorts, shirts, women's vests, underwear, body clothes, pantyhose, base cloth, plain waist, bras, socks, etc. ;Swimwear, sportswear, bodysuits, ski suits, all kinds of competitive sportswear; accessories such as gloves, hats, scarves; pajamas, nightgowns and other pajamas; T-shirts, jackets, sweaters, vests, pants, skirts , knitted sweaters, coats, pullovers and other outerwear; diapers, bandages, brackets, masks, car interiors, nets, tapes and other non-clothing materials. It is known as "monosodium glutamate" in the textile industry and "cloth without ammonia". [0003] At present, there are two main methods for preparing spandex, namely dry spinning and melt spinning. Compa...

AI Technical Summary

Problems solved by technology

[0006] At present, low-temperature heat-setting spandex fibers are mainly prepared by dry spinning, such as CN103255500A, CN02808480.2, CN101484620, CN101495683, etc., but there are few reports of low-temperature heat-setting spandex fibers prepared by melt spinning

Images