The Study of Oligomer and Re-scouring Effect by Alkali Dyeing for New Synthetic Polyester Fiber

• Main Author: 倪聖國
• Other Authors: 芮祥鵬
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/87974673066967420657

碩士 === 國立臺北科技大學 === 有機高分子研究所 === 90 === In comparison with traditional polyester, new synthetic polyester fiber requires higher-level spinning and weaving technologies. It is the trend to simplify and speed up the production procedures in order to achieve the best benefit. Therefore, the applications of the finishing agents, such as lubricant, wax, anti-static agent, cataplasm etc., are more complex and variable, which would cause lots difficulties in the subsequent dyeing and finishing processes. Oligomer (white powder) is usually a problem in the high temperature dyeing process for polyester. In recent years, the development of new synthetic fiber is blooming, and the staining problem caused by inadequate pretreatment and residual oligomer becomes critical in the dyeing production. This article discussed the removing effect of the residual size and oligomer by alkali dyeing method in the high temperature dyeing condition for polyester new synthetic fiber. According to the experimental results and SEM photos, alkali dyeing showed better re-scouring effect in the comparison with acid dyeing method. The re-scouring effect of the alkali dyeing was able to remove the released oligomer, as well as to prevent oligomer agglomeration on the fiber surface and staining on dyeing machines. Besides, the fabric harsh handle, which was caused by oligomer, could be improved. Our results further demonstrate that FOY and HOY causes the highest oligomer mgration followed by regular POY, finally CDPET POY and csustic wieight reduction. This study examines dust or white ash formation, its characterizatiom and preventiom during the treatment of PET fabrics. IR and MNR were performed to characterize the chemical structure GPC was applied determine the molecular weight, and DSC was used to measure the Tm value. Accordingly, the main ingredient of the dust from fiber texturing was identified as PET polymer, whereas the dust from weight-reduction was primarily terephthalic acid, and that from fabric HT dyeing was mainly PET cyclic trimer. Key Wards : New synthetic polyester fiber, Alkali dyeing, High temperature dyeing (HT dyeing), Re-scourng effect, Oligomer migration, PET cyclic trimer, Terephthalic acid(TPA)