Shanghai, China — Covestro claims to have made the first polyurethane rotor blade for wind turbines in Asia.
The company said the 37.5m-long blade was made with a polyurethane infusion resin from Covestro and glass fibre mats from Chongqing Polycomp International, a Chinese glass fibre maker at the Shanghai FRP Research Institute.
A vacuum pressure infusion system with continuous degassing was used to produce the rotor blade, Covestro said.
The firm added that PU was chosen for the matrix material because it has low viscosity, flowing quickly and wetting the glass fibre reinforcement well. The curing reaction is less exothermic than typical epoxy systems with which it competes.
Kim Klausen, global head of the Wind Energy Program at Covestro, said: “It's further proof of the performance and cost advantages of polyurethanes over epoxy resins in wind power generation."
Klausen added: “The faster curing significantly improves productivity and that gives manufacturers a major cost advantage.”