Romans, France -- Until now, manufacturers of polyurethane hot-cast elastomers have had to perform a delicate balancing act. If they choose to use methylene diphenyl diisocyanate (MDI) as a raw material, they must be extremely careful to observe processing parameters such as product temperatures, mould temperatures and machine settings with meticulous accuracy.
However, if they opt for toluene diisocyanate (TDI) prepolymers with their broad range of processing options, they must take care that they do not exceed the maximum concentration of TDI permitted in the workplace.
Now, as researchers from Baulé SA of Romans, France, will explain in a presentation at next week's UTECH Europe 2009 conference, Baytec MAX, a new generation of amine-crosslinked prepolymers, offers a way out of this dilemma.
Developed by Leverkusen, Germany-based Bayer MaterialScience AG, it contains no TDI, yet remains easy to process. But that's not all. Numerous tests by Baulé have now revealed that the resulting polyurethane elastomers possess excellent mechanical properties and also have exceptional abrasion resistance and hydrolytic stability.
Common aromatic amines such as MOCA (2,2' dichloro-4,4'-methylene dianiline) are suitable as crosslinking agents for the Baytec MAX system. Tests have shown that Baytec XL1705 is an appropriate curative, perfectly-priced option for processors who want to have a system free of both MOCA and TDI.
"This technology is more than just an alternative to TDI prepolymers and also to prepolymers which have a low content of free TDI of less than 0.1 percent. Instead, this range of products is an innovation that provides manufacturers with a safe, easy method of producing polyurethane cast elastomers with an altogether superior range of properties," said Dr Jens Krause, technical integration manager at Baulé, a joint venture that last year pooled the cast elastomer operations of Bayer MaterialScience and Michel Baulé SA.
A paper entitled "Baytec MAX: MDI-amine-crosslinked prepolymers" will be presented Thursday 2 April 2009 at 2.00 pm at UTECH Europe 2009 in Maastricht.
For more information on the conference programme and to register, visit www.urethanes-technology-international.com/utech2009.aspx
For information on the UTECH exhibition go to www.utecheurope.nl