Indiana, Indianapolis - Bayer MaterialScience llc says that its new PU gelcoats offer a more environmentally acceptable alternative to traditional gelcoats in demanding outdoor uses, and adds that visitors to the American Coatings Show 8-10 May in Indianapolis can discuss the technology with Bayer experts at booth No 301.
While styrene and unsaturated polyester gelcoats have traditionally been used for demanding outdoor applications such as transport, marine and wind energy, among others, BMS says that manufacturers of composite parts have been seeking a gelcoat that is good outdoors, but also better for the environment.
"Polyurethane gelcoats are a viable solution," BMS says, with coatings built on Desmophen NH and Desmodur N offering "excellent weather, impact and abrasion resistance, compared with traditional gelcoats."
PU gelcoats allow users to tailor the chemistry to achieve each application's desired cure speed. In-mould polyurethane gelcoats are also inherently free of volatile organic compounds (VOCs), the company adds.
Also, PU gelcoats have better crack resistance, resulting in fewer reject parts during demoulding.
"Customisation of cure speed and superior weathering properties make polyurethane gelcoats a great choice for composite parts to be used in outdoor applications," said Dr Ed Squiller, business development director at BMS, in the company statement.
Squiller adds that, "End-use applications, including wind energy blades, automobiles and heavy-duty trucks, capitalise on the customisable chemistry and excellent outdoor weathering performance of polyurethane gel coats."