环氧丙烯酸酯的光固化动力学研究

Study on the Photocuring Kinetics of Epoxy Acrylate Resin

采用光差扫描量热法考察了环氧丙烯酸酯的光固化动力学行为。实验结果表明,增加光引发剂和活性单体的浓度的都可以使反应的转化率有明显的提升,当光引发剂的质量分数从2%增加到5%,转化率由76.2%上升至88.3%;当活性单体质量分数从15%增加到25%,转化率由73.8%上升至95.3%,但单体质量分数的提高对反应速率的变化不是很明显。此外,光固化反应速率对光强非常敏感,而氧气对丙烯酸酯光固化体系的阻聚作用较弱。

The photocuring process of epoxy acrylate resin was studied by differential photo - calorimetric （DPC） method in this paper. Experimental results showed that the conversion is increased sharply with the raising of either photoinitiator concentration or monomer concentration. For example, when the photoinitiator concentration is increased from 2% to 5%, the conversion from 76. 2% to 88.3%. While the monomer concentration is increased from 15% to 25%, the conversion from 73.8% to 95. 3%. But the conversion rate increases slowly with the raising of monomer concentration. In addition, The photocuring process is sensitive to the UV light intensity. But the inhibition of the oxygen on photocuring process is weak.