Structure and Features
✔High salt water resistance similar to MXDA ✔Long pot life
✔Suitable for large VaRTM molding such as blades
✔Low alteration (carbonate) ✔Good cured product without stickiness
G-240, like MXDA, has high salt water resistance, long pot life, and low carbonation resistance. Therefore, G-240 can be used as an epoxy curing agent for wind blade manufacturing, improving the workability and productivity of blade manufacturing and imparting saltwater resistance to the blade itself.
Resin viscosity (heated to 50°C)
As wind blades become larger, epoxy resins are required to have a long pot life. We measured the resin viscosity behavior when G-240 replaced the alicyclic amine in the current curing agent composition (D-230/alicyclic amine); as the amount of G-240 replaced increased, the increase in viscosity of the epoxy resin composition slowed, resulting in a long pot life.
※D-230:Made by Huntsman JEFFAMINE ®
Carbonation of resin composition (23°C-80%RH, 30min)
When repairing blades, since they are laminated by hand layup, surface quality is important to evaluate. While common aliphatic amines partially or totally whiten, epoxy resins cured with G-240 do not cause carbonation and have a clear appearance.
Resin condition after curing (23°C-50%RH, 15h)
Workability is important when repairing blades. General aliphatic amines have a sticky surface even after 15 hours at 23°C/50%RH (the black area in the photo shows the sticky area). On the other hand, G-240 has no surface stickiness, indicating that it has cured sufficiently.
Compositions with G-240 not only contribute to longer pot life than conventional formulations, but also tend to have higher mechanical strength and elastic modulus as GFRP.