桐油基光引发剂的制备及性能研究

Preparation and Properties of Tung Oil - based Photoinitiator

摘要:

桐油（TO）、桐酸（TA）与马来酸酐(MA)经Diels-Alder反应，合成桐油酸酐（TOM1∽TOM3）及桐酸酸酐（TAM）。在三乙胺的催化下，TOM、TAM分子中酸酐分别与Irgacure2959的羟基反应，合成了四种裂解型光引发剂（TOMG1∽TOMG3，TAMG）。用红外光谱、核磁共振氢谱及高分辨质谱表征引发剂结构，利用紫外可见光谱研究引发剂的光分解过程，用实时红外光谱研究引发剂引发1,6-己二醇二丙烯酸酯(HDDA）的聚合过程。结果表明，相对于Irgacure2959及合成的桐油基光引发剂，TOMG3光引发性能最优。以HDDA、 PUA及TOMG3按质量比46:46:8复配的胶液（有效光引发剂基团的含量为2.14 wt%）在28mW/cm2 紫外光照下，胶膜的光固化表干时间为60s，凝胶率96%，固化膜硬度6H，柔韧性5mm，对玻璃的附着力0级。

Abstract:

Tung oil anhydrides（TOM1∽TOM3）and tung acid anhydrides were synthesized via the Diels-Alder reaction of tung oil、tung acid with maleic anhydride (MA).Under the catalysis of triethylamine, TOM and TAM molecules were reacted with the hydroxyl groups of Irgacure2959 to produce four photo-cleavage photoinitiators (TOMG1∽TOMG3, TAMG).The structure of initiator was characterized by FT-IR and 1H NMR spectroscopy. The Photo bleach of prepared photoinitiator was analyzed by UV visible spectroscopy. The photopolymerization dynamics of 1, 6-hexanediol diacrylate initiated by prepared photoinitiator or Ingancure2959 were studied by real-time FT-IR technology. The results show that TOMG3 has the best photo initiated performance with respect to Irgacure2959 and the synthesized tung oil-based photoinitiators. The UV curing gum of HDDA,、PUA and TOMG3 in a mass ratio of 46: 46: 8 (effective photoinitiator group content 2.14 wt%) were cured under irradiation of 28mW/cm2UV lamps in 60 seconds with gel rate of 96%. The hardness and flexibility of curing film was 6H and 5mm, respectively. The adhesion to the glass was zero level.