光固型支化聚氨酯分散剂的合成

Synthesis of UV-curable branched polyurethane dispersant

摘要:

将聚氨酯分散剂设计成超支化结构，通过在聚氨酯末端分别引入颜料锚固基团和双键基团，合成紫外光固化型支化聚氨酯分散剂（BPUs），使分散剂具有自粘合的效果，以提高印花牢度。通过红外光谱、凝胶色谱、热重分析等分析分散剂的分子结构与性能。通过BPUs为分散剂制备颜料色浆的分散性能良好，粒径分布均匀且具有较低的粘度，并且高温储存5天粒径变化最小在20 nm以内，3000 rpm离心稳定性在92%以上。使用该色浆直接印花，其水洗牢度保持在3~4级, 比商用分散剂提高了2级左右。

Abstract:

The polyurethane dispersant was designed into a hyperbranched structure, and a series of UV-curable branched polyurethane dispersants (BPUs) were synthesized by introducing pigment anchoring groups and acrylic groups into the ends of the polyurethane. This structure endowed the dispersant a self-adhesive effect to improve the fastness of printing. The molecular structure and performance of the dispersant were analyzed by infrared spectroscopy, gel chromatography. The pigment paste prepared with BPUs as the dispersant displayed good dispersion performance, uniform particle size distribution and low viscosity. The smallest particle size change within 5 days of high temperature storage was within 20 nm, and the centrifugal stability at 3000 rpm was above 92%. Using this color paste for direct printing, its washing fastness was maintained at 3~4 level, which was about 2 levels higher than commercial dispersants.