棉织物热转移印花的机制

为实现棉织物的热转移印花，提出了架桥思想以及通过一种架桥剂实现架桥思想的基本思路；按架桥剂设计思想试制架桥剂FY-1，用C.I.分散红60上染经FY-1处理的棉织物，其结果证明了架桥思想的可行性。通过光学显微镜、透射电镜等方法分析了架桥机制，由此得出棉织物热转移印花的机制：架桥剂通过自身对棉纤维的亲合性和渗透性预先进入纤维微孔内，同时接纳分散染料的染座分布在微孔内；架桥剂依赖其热膨胀作用在热转印温度下溶胀纤维；分散染料在热转印温度下升华，以分子间作用力上染纤维。

Mechanism of heat transfer printing of cotton fabric

In order to realize the heat transfer printing of cotton fabric, the idea of “bridge-linking” was put forward and a bridge-linking agent named FY-1 was prepared. The feasibility of bridge theory was proved by the example: heat transfer printing was performed on the cotton fabric which had been pretreated by FY-1, with C.I. disperse red 60. The bridge mechanism was analyzed by using physical methods such as optical microscope, transmission electron microscope. It seems there are three steps in heat transfer printing of cotton fabric: the bridge-linking agent enters into the fiber by the affinity and penetrating power, distributing dye-sites for disperse dye in the micropore; the bridge-linking agent can swell fiber at heat transfer printing temperature with the help of its thermo-swellability; disperse dyes sublimate at heat transfer printing temperature and dye on fiber through the force between molecules.