Czech Zbigniew, Kabatc Janina, Bartkowiak Marcin, Licbarski Adam, Mozelewska Karolina, Kwiatkowska Dominika
International Laboratory of Adhesives and Self-Adhesive Materials, Department of Chemical Organic Technology and Polymeric Materials, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology, Pułaskiego 10, 70-322 Szczecin, Poland.
Department of Organic Chemistry, Faculty of Chemical Technology and Engineering, UTP University of Science and Technology, Seminaryjna 3, 85-326 Bydgoszcz, Poland.
Materials (Basel). 2020 Nov 16;13(22):5151. doi: 10.3390/ma13225151.
A new class of additionable ultraviolet photoinitiators that can be used, through addition, for modification of the acrylic polymer chain and their influence of main properties of acrylic pressure-sensitive adhesives (PSAs) is described here. The photoinitiators studied are based on benzophenone, dibenzofuran and anthraquinone chromophores. The propyleneimine carbonyl is the reactive additionable group incorporated in the photoinitiator structure. First, the solvent-borne acrylic pressure-sensitive adhesive was synthesized and characterized. Then, a photoinitiator suitable for addition to the acrylic polymer chain possessing a carboxyl group was added before UV-irradiation. A mechanism of UV-initiated cross-linking reaction of acrylic PSA with additionable photoinitiators was done as well. The influence of the concentration and type of photoinitiator, UV-crosslinking time and UV-dose on peel adhesion, shear strength and tack of solvent-borne acrylic pressure-sensitive adhesives cross-linked by UV light was studied and presented here. It was found that the tack depends on the UV-dose and photoinitiator concentration. An increase of UV dose results in an increase of shear strength of acrylic pressure-sensitive adhesive (PSA) formulations.
本文描述了一类新型的可加成紫外光引发剂，其可通过加成用于丙烯酸聚合物链的改性，以及它们对丙烯酸压敏胶粘剂（PSA）主要性能的影响。所研究的光引发剂基于二苯甲酮、二苯并呋喃和蒽醌发色团。丙烯亚胺羰基是引入光引发剂结构中的反应性可加成基团。首先，合成并表征了溶剂型丙烯酸压敏胶粘剂。然后，在紫外线照射前加入一种适合加成到具有羧基的丙烯酸聚合物链上的光引发剂。还研究了丙烯酸PSA与可加成光引发剂的紫外线引发交联反应机理。本文研究并展示了光引发剂的浓度和类型、紫外线交联时间和紫外线剂量对紫外线交联的溶剂型丙烯酸压敏胶粘剂的剥离附着力、剪切强度和粘性的影响。结果发现，粘性取决于紫外线剂量和光引发剂浓度。紫外线剂量的增加会导致丙烯酸压敏胶粘剂（PSA）配方的剪切强度增加。
