Research on the New Type of Thermal Resistance Resin Reforming by Oxazolidinones

本项目旨在通过引入恶唑烷酮环来开发一种新型耐热环氧树脂。从环氧乙烷和异氰酸酯中选择性地形成恶唑烷酮是最基本和最重要的课题。因此，我们对该环化反应的有效催化剂进行了研究。(1)Ph_4Sbl-Me_2Snl_2和Ph_4Sbl-ZnCl_2体系是最有效的催化剂，在该催化剂体系中几乎没有检测到亚氨基二恶茂烷和异氰酸酯三聚体等副产物。(2)研究了恶唑烷酮的生成途径，发现在催化量的AlCl_3存在下，亚氨基二恶茂烷和环氧乙烷的立体定向环加成反应进行。(3)该方法可制备环氧乙烷与异氰酸酯直接环加成所不能得到的新型恶唑烷酮。(4)用该催化剂生产的环氧树脂比传统的环氧树脂具有更高的软化点（160 - 190 ℃）。

This project aims the development of a new type of thermal resistance epoxy resin reforming by introduction of oxazolidinone ring. The selective formation of oxazolidinones from oxiranes and isocyanates, for this aim, is the most basic and important subject. So, we investigated on the effective catalyst for this cycloaffition.Following results are some advantages in this research.(1) Ph_4Sbl-Me_2Snl_2 and Ph_4Sbl-ZnCl_2 systems are the most effective catalysts, and in this catalyst systems little by-products such as iminodioxolanes and isocyanate-trimer were ditected.(2) The formation path of oxazolidinone was examined, and it was found that stereospecific cycloaddition of iminodioxolanes and oxiranes proceeded in the presence of catalytic amounts of AlCl_3.(3) The method mentioned above can produce the new types of oxazolidinones which have not obtained by the direct cycloaddition of oxiranes with isocyanates.(4) The epoxy resins produced by this catalysts have higher softening points (160 - 190 C) than conventional ones.