桐油基漆酚类似物的光固化活性研究

Study on Photocuring Activity of Tung Oil Based Urushiol Analogues

本文研究了桐油基漆酚类似物的光固化活性及其在UV光固化体系中的应用。通过对比桐油基漆酚类似物在室温(28℃)、加热(80℃)、UV光(2.5kW)等条件下的固化情况,探究其固化活性,并研究了桐油基漆酚类似物的添加对UV光固化体系的影响,考察了光引发剂、功能性单体以及桐油基漆酚类似物的添加量对UV光固化体系的影响。研究结果表明:桐油基漆酚类似物单独不能固化成膜,PI-819为最优光引发剂,多官能度单体有利于提高成膜的拉伸强度,而单官能度单体有助于提高断裂伸长率,单体HEMA∶HDDA的最优比例范围为10∶10~14∶6之间,桐油基漆酚类似物的最优添加量范围为5~10%,另外添加了10%漆酚类似物的成膜具有良好的力学性能,凝胶率为99.5%,拉伸强度高达20.52MPa,断裂伸长率为6.87%,并且成膜表面比较光滑、平整。

In this paper, the photoactivity of tung oil-based urushiol analogues(CAT-ME) and its application in UV curing system were discussed. By comparing the curing conditions of tung oil-based urushiol analogs at room temperature(28℃), heating(80℃), and UV light(2.5 kW), the curing activity was investigated, and the effects of photoinitiators, functional monomers and tung oil-based urushiol analogs on the UV curing system were also studyed. The results showed that tung oil-based urushiol analogs(CAT-ME) could not be solidified into a completed film, due to lacking of biological enzyme, a main component in raw lacquer. PI-819 was the best photoinitiator. Multifunctional monomer was beneficial to increase the tensile strength of the film, while monofunctional monomer was helpful to increase the elongation at break, and the optimum proportion of HEMA∶HDDA was 10∶10~14∶6. The optimal proportion of CAT-ME was 5%~15%. In addition, the UV-cured films mixed with 15% CAT-ME possessed excellent mechanical property and thermal stability, and the gel fraction reached 99.5%, the tensile strength was up to 25.07 MPa while the breaking elongation increased by 4.57%, and SEM displayed that the surface of the film was relatively smooth and flat.