In the domestic textile market in the past two years, the demand for moisture-absorbent and sweat-wicking textiles has gradually increased, which has attracted the attention of industry insiders. The uses of moisture-absorbing and sweat-wicking fibers include pure spinning, blending or interweaving with cotton, wool, silk, linen and other chemical and synthetic fibers; they can be woven or knitted, and have good development prospects.
Performance of moisture-wicking fabrics Moisture-wicking fabrics have deep dyeing properties. Because the moisture-wicking polyester surface has concave and convex narrow grooves, the incident light can be diffused multiple times and absorbed by the fibers, reducing reflected light, resulting in deep dyeing. The stability is greatly increased, and the dyeing brightness and deep dyeing properties are improved.
Moisture-wicking fabrics also have low fluffing and pilling properties. After CoolplusII is treated with NaOH 5-7g/L at 100℃-120℃ for 30 minutes and scouring, the polyester will lose part of its weight (similar to alkali weight loss) with the alkali treatment. The strength has also been reduced, and its anti-pilling performance can reach level 3. Based on the above reasons, the weave specifications of CoolplusII should be designed to be appropriately tight to prevent the fabric from being too loose after scouring.
Several issues in dyeing and finishing. The dyeing and finishing technology of moisture-absorbent and sweat-wicking fabrics (pure and blended) can basically refer to the process flow and technical conditions of conventional polyester and polyester-cotton blended fabrics. However, the special structure of moisture-wicking polyester must ensure that it will not be damaged, otherwise it will affect the performance of the product,
The main issues of concern are:
1. Moisture-absorbing and sweat-wicking polyester is mainly a special-shaped fiber, and most surfaces have micro-groove structures. The surface area of the same fineness is 20-50% larger than that of conventional round fibers. Therefore, high-temperature alkali treatment in pre-treatment must be carefully considered.
2. For the same reason as above, disperse dyes take up the dye faster when dyed. Therefore, in order to dye the fabric blended with cotton to have good same-color properties, the original recipe for dyeing cotton (or dyeing polyester) must be appropriately adjusted.
3. When softening moisture-wicking fabrics, it is not advisable to use hydrophobic varieties, otherwise it will affect the wicking effect of the fabric and reduce its moisture-wicking function. After pure and blended fabrics are treated with moisture-wicking agents, their Moisture wicking properties can be improved, and it is better to choose durable varieties.
4. The newly launched moisture-absorbent and perspirant is mainly a compound composed of water-dispersed polyester as the main component. The origin of the development of this additive can be traced back to the 1960s and 1970s, when it was first introduced by the British ICl Company. Permalose to the market, Permalose-T is used for polyester fabrics, and Permalose-TG is used for polyester-cotton blended fabrics.
Water-dispersible polyester is a block copolymer of terephthalic acid (ethylene glycol) and polyethylene oxide. Depending on the molecular weight and melting point of the block copolymer, it is about 50-60°C. It is easily dispersed in water. The body becomes gel-like when the concentration is high. The molecular structure of the water-dispersed block copolymer has the same benzene ring as the molecular structure of polyester. At high temperatures, the molecular segments are anchored on the surface of polyester, causing the polyester to change from its original hydrophobic surface to a durable water-based surface.
There are two application methods for water-dispersible embedded copolymers: rolling baking process and high-temperature impregnation process. The former requires heat treatment at 160℃-170℃ for 3-5min, and the latter requires heat treatment at 130℃ for 30min. The amount of application on the fabric (based on the effective activity Ingredients) is about 1-1.5%. The treatment effect is better and the effect is stable with the high-temperature impregnation process. After moisture-wicking finishing, in addition to significantly improving the moisture-wicking function, it also has antistatic and easy-to-remove effects.
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