Author: Chia-Shing Wu PhD
Polyamide (PA) is commonly called as nylon. It is widely used in automotive, aerospace/aircraft, medical, industrial and civilian applications due to its light weight, acid and alkali resistance, good weather resistance and long-term stability. However, it is not easy to bond nylon, mainly attributed to its crystallinity, chemical inertness, and poor wettability of the substrate surface (ie, low surface energy, Low Surface Energy: LSE), which makes it difficult to bond. We have recently successfully developed a new type of nylon Primer (GS610). The use of GS610 nylon primer can greatly improve the difficult characteristics of nylon bonding. At the same time, it can be used with acrylic structural adhesive KA001-1 to significantly enhance the bonding performance. It still retains a good bonding strength after putting in water at 50 oC for 168 hours.
Figure 1 shows the appearance of a nylon sheet coated with GS610, heated at 80 oC for 15 minutes, and then subjected to a 100 grid test (Figure 2). It is found that the primer film is almost not peeled off (5B PASS), which reveals that GS610 has a good effect on nylon. The ability to modify the surface of the nylon is conducive to matching with the acrylic structural adhesive KA001-1 to achieve a good bonding strength. Figure 3 exhibits the use of GS610 for nylon surface treatment, followed by test pieces with KA001-1, and then boiled at 50 oC for different days. The shear strength (kgf/cm2) is ca. 40 (0 day) and 37 (1 day), 32 (2 days), 27 (4 days), 20 (7 days). Therefore, it is recommended to adapt the combination of GS610 + KA001-1 to meet the requirements of nylon adhesion and waterproofing at the same time. If you have a variety of customized development needs, please feel free to contact us.
