02/09/2011

www.gupta-verlag.de/polyurethanes

Novel polyaspartic-based gelcoats

Reinstadtler presented "Greener Options for Site-applied Gelcoat Topcoat Refurbishment Using Polyaspartic Technology" as part of SSPC 2011 featuring GreenCoat (31 January - 3 February 2011) in Las Vegas, NV, USA. The presentation demonstrated how novel polyaspartic-based gelcoat technology can replace traditional site-applied polyester gelcoats, while also offering lower volatile organic compounds (VOCs), improved weatherability, fast return-to-service time, less odour and improved scratch, chip and crack resistance.In his presentation, Reinstadtler compared the new technology to traditional gelcoats and coatings. Gelcoats are the decorative outer layer of a composite part and are usually pigmented, with white being the primary colour. They are typically 15 - 20 mils thick and site applied over an existing aged gelcoat as a repair. Conventional gelcoats are the reaction product of unsaturated polyester or vinyl ester and styrene using peroxide as an initiator. Conversely, polyaspartic-based gelcoat technology is a 100 % solid, two-component (2K) aliphatic polyurea system. The new gelcoat options utilising polyaspartic technology meet the demands of owners and contractors, such as reduced VOCs, faster cure time, low to no odour and ease of use. As Reinstadtler explained, testing performed by BMS assessed polyaspartic-based gelcoats on a variety of criteria, including weatherability, abrasion resistance and impact resistance. The polyaspartic-based gelcoat exhibited superior performance, including abrasion resistance that was two times better abrasion resistance than traditional polyester gelcoats.According to Reinstadtler, "the use of polyaspartic technology also benefits contractors by allowing the application of one thick coat, eliminating time-consuming multiple coats, while still providing owners with a more durable and sustainable solution."In his presentation, Reinstadtler addressed a variety of applications for which gelcoats can be used, such as exterior construction - waterslides and decorative facades; power applications - wind turbine blades; and recreational vehicles - boats and snowmobiles. In addition, he demonstrated the advantages of polyaspartic-based gelcoats - both indoors and outdoors - through case studies of two aged waterslide refurbishment projects.

www.gupta-verlag.de/polyurethanes