NEW MATRIX BASED ON BENZOXAZINE FOR RESIN TRANSFER MOLDING (RTM) AND THEIR COMPOSITES

Three low viscosity benzoxzine resins were synthesized, and two kinds of RTM resins based on the benzoxazine resins containing catalyst of organic acid or epoxy tertiary amine and their glass cloth laminates were prepared. The influence of components and catalysts on viscosity and gelation time of the resins as well as the mechanical properties of the laminates has been investigated systematically. Both benzoxazine RTM resins catalyzed by organic acid or epoxy tertiary amine all have good technological properties; their viscosity is lower than 500cp in 2 hours at 70~90℃. The laminate made from organic acid system has T g 185℃(DMA) and flexural strength 405MPa at 180℃. The laminate made from epoxy tertiary amine system has T g 175℃ (DMA) and flexural strength 500MPa at 155℃. All the laminates can be used as heat resistant structural materials at 155℃.Therefore, a new heat resistant resin system required for RTM technological properties has been developed.