| Popis: |
A primer of the bismaleimide resin toughened with block copolymer was prepared. The properties of the primer, such as adhesion, pencil hardness, impact resistance, environment resistant, ageing resistant performance and etc. meet the requirements of the technical specifications of GJB1388. The thermal property of the primer was characterized by differential scanning calorimeter (DSC), thermal gravity analysis (TG), and dynamic mechanical analysis (DMA). The results show that the primer possesses good heat resistance, the glass transition temperature of the primer reach 238℃, 5% mass heat lost temperature is 384℃ after 200℃ cured, and the glass transition temperature of the primer reach 268℃, 5% mass heat lost temperature is 407℃ after 230℃ heat treatment respectively. Bonding strength will increase when the bismaleimide primer doubled with bismaleimide film adhesive, when the primer doubled with J-188 bismaleimide film adhesive, peel strength increases to 107%, the room temperature shear strength and high temperature shear strength increase by 10%.The primer can also be used with other bismaleimide film structural adhesives, which are suitable for the bonding between metals or bismaleimide composites with metals. |
