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采用正交试验的方法,研制了一种新型低收缩耐候性紫外光固化材料。该体系包括KH-570改性的自制纳米二氧化硅(75nm)、自制双酚A环氧丙烯酸、光引发剂(831、1 173)、活性稀释剂TMPTA及螺环膨胀单体(3,9-二乙基-3,9-二羟甲基-1,5,7,11-四氧杂螺环-5,5-十一烷)。通过控制改变二氧化硅、活性单体、光引发剂、螺环单体与丙烯酸树脂的不同配比进行试验。结果表明:当二氧化硅用量为10%,活性稀释剂TMPTA用量15%,膨胀单体用量15%,复合光引发剂用量3%时,体系综合性能最佳,耐紫外老化性能得到明显改善。该体系性能优良,有广阔的应用前景,当改变稀释剂种类时,还可以应用于补牙材料。
A new type of low shrinkage and weatherable UV curable material was developed by orthogonal test. The system consists of KH-570 modified self-made nano-silica (75nm), self-made bisphenol A epoxy acrylate, photoinitiator (831,1 173), reactive diluent TMPTA and spiro ring expansion monomer -diethyl-3,9-dimethylol-1,5,7,11-tetraoxaspiro-5,5-undecane). By controlling the changing ratio of silica, reactive monomer, photoinitiator, spiro monomer and acrylic resin, the experiment was carried out. The results showed that when the amount of silica is 10%, the amount of reactive diluent TMPTA is 15%, the amount of monomer for expansion is 15% and the amount of composite photoinitiator is 3%, the system has the best comprehensive performance and the UV aging resistance is obviously improved. The system has excellent performance and broad application prospects. When the type of diluent is changed, it can also be applied to dental fillings.