软质光固化树脂的制备及其性能研究

Preparation and Characterization of Soft UV-curing Resin

以异佛尔酮二异氰酸酯、聚乙二醇、乙二醇和丙烯酸羟乙酯为主要原料,通过分子结构设计合成聚氨酯丙烯酸酯(PUA)预聚物树脂,并以2,4,6-(三甲基苯甲酰基)二苯基氧化膦(2,4,6-Trimethyl benzoyldiphenyl phosphine oxide,TPO)为光引发剂、丙烯酸异辛酯(2-Ethylhexyl acrylate,2-EHA)为稀释剂,制备了可快速固化的软质光固化树脂。同时研究了不同光引发剂及稀释剂含量对固化件的固化时间、拉伸性能、刚度和扩张度的影响。研究表明:当光引发剂TPO的质量分数为3%时,树脂在1s内快速固化;当稀释剂2-EHA质量分数为10%时,固化件的柔性最佳并表现出良好的机械性能;傅里叶红外光谱显示固化后的树脂双键完全聚合。制备的软质光固化树脂可用于光固化3D打印。

A feasible method was proposed for synthesizing fast curing soft UV-curing resin by using TPO as photoinitiator and 2-EHA as diluent.PUA was prepared through the method of molecular structure design by using polyfenone diisocyanate,polyethylene glycol,ethylene glycol and hydroxyethyl acrylate as raw material.The influence of the content of photoinitiator and diluent on the curing time,tensile properties,stiffness and expansion ratio of the cured specimens were studied.It was found that the resin curing within 1s at the mass fraction of photoinitiator TPO with 3%.Additionally,when the mass fraction of diluent 2-EHA reaches to 10 %,the flexibility of the curing specimen is the best and also shows good mechanical properties.The cured double bonds of the resin are completely polymerized via the fourier transform infrared（FTIR）test.The soft UV-curing resin prepared in this study is suitable for UV 3D printing.