UV-LED喷墨油墨用单体和光引发剂性能的评估

Evaluation on Performance of Monomers and Photoinitiators for UV-LED Inkjet Inks

目的为了建立评估方法,优选出适用于UV-LED固化喷墨油墨的光引发剂和低粘度单体种类。方法用紫外-可见光分光光度计表征TPO, ITX, DETX, 819, 784, TPO-L等常见的6种光引发剂的紫外-可见吸收光谱。采用TPO为引发剂,分别用HDDA, ACMO, DPGDA, EOEOEA, DMAA等5种常用的低粘度单体,配制UV-LED喷墨油墨用连接料和油墨,用红外光谱和可见光透过光谱表征连接料的固化速度和固化膜的颜色,并通过指压法判定表干程度。结果 DMAA,EOEOEA组成的喷墨油墨连接料成膜性不好;含有ACMO连接料的透明度较好。结论满足食品、药品包装安全要求,可以用于UV-LED固化的光引发剂为TPO,TPO-L及819;以粘度和固化程度为标准,用于制作喷墨油墨的5种单体的适用性从高到低排序为DPGDA, HDDA, ACMO, EOEOEA, DMAA。建立的评估方法合理有效。

The work aims to establish an assessment method and select photoinitiators and monomers with low viscosity suitable for UV-LED curable inkjet inks.UV-visible absorption spectra of six common photoinitiators such as TPO,ITX,DETX,819,784 and TPO-L were characterized by UV-Vis spectrophotometer.TPO was taken as initiator.Binders and inks for UV-LED inkjet inks were prepared with five commonly used low-viscosity monomers such as HDDA,ACMO,DPGDA,EOEOEA and DMAA.The curing speed of the binders and the color of the cured films were characterized by infrared spectroscopy and visible light transmission spectroscopy,and the degree of dryness was determined by acupressure method.The binder containing DMAA,EOEOEA had poor film-forming property.The binder containing ACMO had better transparency.The established evaluation method is reasonable and effective to meet the safety of food and drug packaging.The photoinitiators that can be used for UV-LED curing are TPO,TPO-L and 819;based on low viscosity and degree of curing,the five monomers are suitable for inkjet ink formulation from high to low order:DPGDA,HDDA,ACMO,EOEOEA,DMAA.