光敏树脂合成及3D打印的综合实验教学设计与实践

Instructional Design and Practice of Comprehensive Experiment for Synthesis of Photosensitive Resins and 3D Printing

针对综合实验的特点,结合创新性、趣味性等特性,设计了光敏树脂合成及3D打印综合实验。实验用1,6-己二异氰酸酯(HDI)三聚体和丙烯酸羟乙酯反应,以丙烯酰吗啉(ACMO)为活性溶剂,合成可紫外光固化的预聚体树脂。通过对预聚体树脂的—NCO测定、红外光谱、核磁共振,分析了HDI三聚体和丙烯酸羟乙酯的反应程度,表征预聚体树脂的结构及评价光固化性能,并与其他光固化单体和光引发剂配合制备黏度适宜的光敏树脂。用405 nm波长的桌面级3D打印机打印出测试样条和展示样品,通过对样条性能测试,表明该光敏树脂打印的样条具有较好的力学性能。本实验开设在本科四年级的综合教学实验中,其可以使本科生学到光固化树脂的制备方法,了解化学材料与数字模型及3D打印技术的结合,体会聚合物结构与性能的关系,增强本科生对数据的分析处理能力以及拓展本科生对其他学科的知识水平。

According to the characteristics of the comprehensive experiment,combined with the characteristics of comprehensive,innovative and interesting,the photosensitive resin synthesis and 3D printing comprehensive experiments are designed.In this paper,UV-curable resins were firstly synthesized by the reaction of 1,6-hexadiisocyanate(HDI)trimer with hydroxyethyl acrylate in the active solvent of acrylmorpholine(ACMO).The reaction degree between HDI trimer and hydroxyethyl acrylate was analyzed by—NCO determination,infrared spectroscopy,nuclear magnetic resonance and thermal analysis.Furthermore,the structure of the photocurable resin was characterized and the photocurable property was evaluated.The photosensitive resin with suitable viscosity was prepared by combining with other photocurable monomers and photoinitiators.The test splines and display samples were printed by a desktop 3D printer with 405 nm wavelength.In the performance test,these splines shows that they had good mechanical properties.This experiment was opened in the comprehensive teaching experiments of the fourth grade and won the praise of the students,it can enable undergraduate students to learn the preparation method of photocurable resin,and know the combination of chemical materials with digital model and 3D printing technology.It also can help students to understand the design relationship between polymer structure and performance,enhance their ability to analyze and process data,and expand their knowledge level of other disciplines.