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以改性环氧丙烯酸酯为预聚物,采用自由基-阳离子杂化聚合法制备了可在405 nm光照下固化的3D打印光敏树脂。研究了预聚物、稀释剂、光引发剂的含量对光敏树脂力学性能、黏度和体积收缩率的影响。结果表明,当光引发剂添加量为4%时,力学性能最优化;当改性环氧丙烯酸酯含量在48%~58%时,该体系能满足3D打印光固化材料的使用要求;采用本方法制备的光敏树脂具有卓越的热稳定性。
Using modified epoxy acrylate as prepolymer, the 3D printing photosensitive resin which can be cured under 405 nm was prepared by free radical - cationic hybrid polymerization. The effects of prepolymer, diluent and photoinitiator on the mechanical properties, viscosity and volume shrinkage of photosensitive resin were studied. The results show that the mechanical properties are optimized when the content of photoinitiator is 4%. When the content of modified epoxy acrylate is in the range of 48% -58%, the system can meet the requirements of 3D printing photocuring materials. The photosensitive resin prepared by the method has excellent thermal stability.