STRUCTURAL ADHESIVE AND BONDING APPLICATION THEREOF

摘要

Structural adhesive composition suitable for high strength bonding of metals and aircraft structural materials. In one embodiment, the structural adhesive composition based on a two part system curable at 200 ° F. (93 ° C.) or less. The two-part system consists of a resin portion (A) and a catalyst portion (B) which can be stored independently at room temperature until ready for use. The resin portion (A) is composed of at least two different multifunctional epoxy resins having different functional groups selected from difunctional, trifunctional and tetrafunctional epoxy resins, inorganic filler particles as specific toughening components and rheology / tetramodity modifying components. It includes. The toughening component includes at least one of core-shell rubber particles and elastomeric polymers and polyethersulfone polymers having different particle sizes. The catalyst portion (B) comprises an aliphatic or cyclic amine compound as the curing agent and an inorganic filler as the rheology / terotropic modifying component. The weight ratio of parts (A) to (B) is in the range of 3: 2 to 10: 2. In another embodiment, the structural adhesive composition is based on a one part system comprising the components of the resin portion (A) in a two part system, mixed with a latent amine curing agent. The one part system may further comprise imidazole and / or aliphatic amines. One-part systems are curable within a temperature range of 140-300 ° F. (60-150 ° F.). The paste adhesives disclosed herein have film-like properties and are particularly useful in the field of fast assembly airplane structure bonding .