Pencil Hardness Tester in Adhesive primer performance research

Adhesive primer is a kind of glue that is sprayed on the surface of the substrate before the metal structure is bonded, so as to be used with the adhesive film, and is mainly used for bonding structural parts. Due to its good wettability, it can form a transition layer between the adhesive film and the metal, enhancing the adhesion.

The author Li Hongfeng used bismaleimide resin as the main resin in the performance of the high-performance dual-maleimide resin primer, and the block copolymer as the toughening agent. A bismaleimide resin-based corrosion-inhibiting primer.

Using a pencil Hardness Tester to test the hardness of the paint film, it is concluded that after the double-horse bottom glue is cured, it can withstand repeated wiping with a butanone solvent ; the adhesion is strong, and the paint film does not fall off after the tape is torn off in the cross-cut area; the impact resistance is good, and there is no cracking Peeling phenomenon; the surface hardness of the paint film is high, and the pencil hardness is greater than 6H; there is no blistering or delamination after soaking in aviation medium for 30 days, and there is no paint peeling phenomenon in the cross-cut test after soaking, and the pencil hardness is still greater than 6H; salt spray test The results show that the cured primer has no foaming, no delamination, and no aging phenomenon beyond the scribed line of the primer beyond 3.2mm; in addition, the double-horse primer has excellent moisture resistance and heat aging resistance. To sum up, the basic properties of the double-horse primer meet the requirements of the GJB1388-1992 specification for corrosion-inhibiting primers for high-durability structural bonding.