摘要
采用无张力碱处理方法处理棉纤维,可更好地提高棉纤维对染料的吸附力。通过对碱处理工艺进行优化,即碱液质量浓度200 g/L,在20℃处理40 s,采用扫描电镜、红外光谱和X射-线衍射等测试方法,研究碱处理前后棉纤维的化学组成和结晶结构,测试了碱处理前后棉纤维的上染百分率、上染速率和固色率。结果表明,碱处理后棉纤维横截面由腰圆形变为近似圆形,中腔消失,纵向天然转曲消失,转变为光滑的近似圆柱体;而化学组成基本无变化,只是一部分纤维素Ⅰ转变为纤维素Ⅱ;结晶度下降了约25%左右;碱处理后棉纤维的上染百分率提高了约23%,上染速率显著提高,固色率提高了约11%,染色性能明显改善。
Tension-free alkali treatment of cotton fibers is approached and optimized. The alkali treatment process is as follows： alkali 200 g/L, treating at 20 ℃ for 40 seconds. With testing methods of scanning electron microscopy, infrared spectroscopy and X-ray diffraction, the chemical composition and crystal structure, and dye uptake, dyeing rate and fixation rate of cotton fi- bers before and after alkali treatment are studied. After alkali treatment, flat cross-section of cotton fibers is changed into a more circular shape, lumen is disappeared, natural convolution in longitudinal section is converted into a smooth and substan- tially round cross-section. The essential chemical composition does not change, only part of the cellulose Ⅰ changes into cellulose Ⅱ. The crystallinity decreases about 25 % ; the dye uptake increases about 23 % ; dyeing rate increases significantly; fixation rate increases about 11%; dyeing properties improves significantly after alkali treatment.
出处
《印染》
北大核心
2011年第6期12-15,共4页
China Dyeing and Finishing
关键词
染色
碱处理
染色性能
微观结构
棉纤维
dyeing
alkali treatment
microscopic structure
dyeing property
cotton fiber
