促进剂BEA在涤纶分散染料低温染色中的作用

Role of promoter BEA in low temperature dyeing of polyester fiber with disperse dyes

为更好地开发高效、节能、环保的涤纶分散染料低温染色新技术,研究新型环保型促进剂BEA在涤纶分散染料低温染色中的作用和效果。通过考察BEA对分散染料在水中溶解性和对涤纶玻璃化转变温度的影响,证明促进剂BEA对分散染料具有增溶助溶作用,对涤纶具有膨化增塑作用。通过相关染色试验发现:促进剂BEA具有优良的促染作用,但促进剂用量存在一个最佳浓度,分散染料用量为6%(o.w.f)、染色温度为108℃时最佳质量浓度为0.8 g/L。在这个浓度附近,促进剂BEA的加入可明显提高分散染料低温染色涤纶的上染速率、上染率以及织物的染深性,其优良的促染作用可使低温染色效果接近甚至超过高温高压染色效果。

For develoPing a high-efficient, energy-saving and environmental-friendly low temperature dyeing technology of disperse dyes, the role of novel promoter BEA in low temperature dyeing of polyester fiber with disperse dyes was investigated. The effects of BEA on the solubility of disperse dyes in water and on the glass transition temperature of polyester fiber were studied by solubility experiment and differential scanning calorimetry （DSC）, and a series of corresponding dyeing experiments were carried out. It was found that BEA promoted solubilization of disperse dyes and had plasticizing effeet for polyester fiber, thus promoter BEA exhibited excellent accelerating dyeing action. However, there existed an optimal concentration of the promoter, i.e., 0.8 g/L when the disperse dyes concentration was 6 % （o. w. f） and the dyeing temperature 108 ℃. Around this concentration, the addition of BEA into dye bath ean improve the dyeing rate, dye uptake and K/S value obviously, and its good dyeing accelerating effect makes it possible that the dyeing result of low temperature dyeing is close to, or even better than, those of high temperature and pressure dyeing.