Preparation and Properties of Advanced Material of High Temperature Resistant Polyurethane Adhesives containing Carborane

Abstract

Materials are the basic industry of national economy, advanced materials are the forerunner and important strategic emerging industry. For the purpose of preparing advanced materials of high temperature resistant polyurethane adhesives, 1,2-bihydroxymethyl carborane was synthesized by the reaction of o-carborane with n-butyllithium and paraformaldehyde, which was employed to prepare the hydroxy-terminated carborane polyester diol with sebacylchloride by the condensation reaction. The structure of the monomer and the polymer was characterized by infrared spectroscopy and 1H NMR. Bi-component polyurethane adhesives were prepared by using the hydroxy-terminated carborane polyester diol as component A and polyisocyanate curing agent (Bayer N3300 and PAPI) as component B, and their molecular structure, shear strength, thermal properties and high-temperature structural evolution were characterized. The results showed that shear strength of the adhesive was higher than 10 MPa at room temperature and low temperature, and higher than 1 MPa after treatment at 600℃ for 1 hour, and the char yield was higher than 40% in nitrogen atmosphere and 60% in air atmosphere at 800℃. After treatment at 400℃ for 1 hour, the carborane structure began to oxidize into B2O3 proved by XRD patterns.