다양한 합성방법을 통한 Acrylic cyanate계 자외선 흡수제 개발과 공정개선

Abstract

In everyday life the sunlight has adventages and harmful aspect. There are several types of ultraviolet rays, but in case of UVA that reaches through the atmosphere it will cause an oxidation reaction which degrades the physical properties. Continuous exposure to ultraviolet rays leads to aging of plastics and changes in color, and the paint causes a peeling phenomenon. In order to prevent these decomposition phenomina, it can be prevented by adding an ultraviolet absorber into the product. Examples of the ultraviolet absorber include benzotriazole, benzotriazine, benzophenone, and cyanoacrylate-based absorber, which absorb selectively ultraviolet energy and release UV energy into thermal energy. In this experiment, we improved the process using ultraviolet absorber of acrylic cyanate series and focused on the environmental part. Benzophenone as a basic structure was synthesized with acrylic cyanate and the substance was synthesized via transesterification and coupling reaction. When coupling reaction is performed using benzophenone imine in existing synthesis method, environmentally harmful amine containing N atoms is generated and causes environmental problem. In order to solve this problem, a benzophenone material was used. To improve the absorption region, benzophenone was synthesized by substituting methyl group and aryl group. In order to measure thermal stability, TGA was used and then NMR and mass were measured to confirm the product.