光固化3D直写打印用双酚A型环氧丙烯酸酯光敏树脂的制备和性能研究

Preparation and performance of bisphenol-A type epoxy acrylate photosensitive resin for ultraviolet cured 3D direct ink writing printing

以双酚A型环氧丙烯酸酯(EA)为预聚物,1,6-己二醇二丙烯酸酯(HDDA)为单体,2,4,6-三甲基苯甲酰基二苯基氧化膦(TPO)为引发剂合成了可应用于光固化3D直写打印的自由基型光敏树脂,该树脂可在紫外灯照射下形成交联网络。研究了TPO含量对光敏树脂表干时间、凝胶率和体积收缩率的影响,结果表明,当TPO为6 g时,表干时间最短,凝胶率较高,体积收缩率较大。在此基础上研究了预聚物和单体质量比对光敏树脂表干时间、黏度、凝胶率、体积收缩率和力学性能的影响。结果表明,当TPO为6 g时,EA和HDDA的质量比为20/9时,光敏树脂表干时间最短,黏度较低,凝胶率最大,力学性能较为优异,适合光固化3D直写打印。

A free radical photosensitive resin suitable for ultraviolet(UV)cured 3D direct ink writing printing was synthesized using bisphenol-A epoxy acrylate(EA)as a prepolymer,1,6-hexanediol diacrylate(HDDA)as a monomer,and 2,4,6-trimethylbenzoyl diphenylphosphine oxide(TPO)as an initiator.The resin could form a cross-linked network under UV irradiation.The effect of TPO content on the surface drying time,gel rate,and volume shrinkage of photosensitive resin were investigated.The results indicated that when 6 g TPO was added,the surface drying time of the cured resin was the shortest,its gel rate was highest,and its volume shrinkage was largest.According to these results,the effect of the mass ratio of prepolymer to monomer on the surface drying time,viscosity,gel rate,volume shrinkage,and mechanical properties of the photosensitive resin were investigated.The results demonstrated that the photosensitive resin containing 6 g TPO had the shortest surface drying time,lower viscosity,the largest gel rate,and excellent mechanical properties at an EA/HDDA of 20/9.This suggests that the developed photosensitive resin is suitable for use in UV cured 3D direct ink writing printing.