橡胶籽油基光固化树脂在立体痕迹提取中的应用研究

以橡胶籽油(RSO)为原料,先制得羟基化橡胶籽油,再利用羟基化橡胶籽油与异佛尔酮二异氰酸酯和季戊四醇三丙烯酸酯反应得到橡胶籽油基聚氨酯丙烯酸酯预聚体(RSO-PUA)。将所得预聚体与不同类型稀释单体甲基丙烯酸羟乙酯(HEMA)、1,6-己二醇二丙烯酸酯(HDDA)共混制备可光固化的树脂,研究了其在立体痕迹提取中的应用效果,并与传统的立体痕迹提取材料(硅橡胶、打样膏)的提取效果进行对比。实验结果显示：当稀释剂HEMA的用量为20%、HDDA的用量为30%时,橡胶籽油基光固化树脂的立体痕迹提取性能最优。橡胶籽油基光固化树脂材料提取立体痕迹的操作简便,固化时间快,黏度可控,痕迹反映完整、清晰、锐利, 制作的立体模型具备检验鉴定条件。而硅橡胶和打样膏制作的痕迹模型存在特征缺损、产生气泡、痕迹反映不完整等不足。

Application of Rubber Seed Oil-based UV-curable Resins in Casting Stereoscopic Impressions

Using rubber seed oil (RSO) as raw material, hydroxylated rubber seed oil was firstly prepared, and then it was reacted with isophorone diisocyanate and pentaerythritol triacrylate to obtain rubber seed oil-based polyurethane acrylate oligomers (RSO-PUA). The obtained oligomers were then blended with different types of thinners hydroxyethyl methacrylate (HEMA) and 1, 6-hexanediol diacrylate (HDDA) to form UV-curable resins. Then, the ultimate properties of the resultant materials in casting stereoscopic impressions were investigated and compared with the traditional stereoscopic impression casting materials (silicone casting material and impression compound). The experimental results showed that when the amount of HEMA was 20% and the amount of HDDA was 30%, the obtained RSO-PUA showed the best performance in casting stereoscopic impressions. The casting stereoscopic impressions with rubber seed oil-based UV-curable resins had the following properties, easy manipulation, fast curing time, controllable, viscosity, obtained complete, vivid and sharpness impression casts, qualified for inspection and identification. However, the casts prepared from silicone casting material and impression compound had some shortcomings, such as feature defect, bubble generation and incomplete impression reflection.