Cologne, Germany – Lanxess has introduced two new low-free diisocyanate prepolymers for the CASE market.
The first, Adiprene LF TR400, is a polycarbonate-based prepolymer designed for cast applications that can resist heat ageing at up to 150°C. The TDI-based prepolymer is cured with 4,4'-methlylenebis(3-chloro-2,6-diethyl aniline).
The company said it is much easier to process than comparable prepolymers. Improvements include longer processing/pour life and cured systems comparable with established high temperature systems.
The second product, Adiprene KLFM E820, is a 1K blocked prepolymer system based on a caprolactam blocked prepolymer and diamine curatives, using the company's low-free technology. The systems offer greater control of the curing process, and an unrestricted pot life.
The long pot life makes it possible to cast very large parts, with complex contours or roto moulding for hollow parts. This makes the low viscosity systems suitable for parts between 1-2mm thickness to several tonnes in size. By using these systems, processors can avoid the costs of a metering and mixing system, said Lanxess.
The products were launched at the annual Polyurethane Manufacturers Association meeting, which was held in Salt Lake City, Utah in early August.