by Marc Broekaert consultant; Gaetano La Delfa; Stefan Ellinger and Maria Luisa Longo, Lonza
Lonza has worked to develop a new, slower curing additive for the polyurea market, which is designed to offer a longer working time for polyurea and polyurethane applications and enable the use of low-pressure machinery in this sector.
Designated Lonzacure P-25 Liquid, the product is an aromatic di-amine chain extender. It is designed to be easy-to-handle in two-component polyurethane cast and polyurea spray applications.
It is suitable for use in formulations where extremely high thermo-mechanical, chemical- and abrasion-resistance are key requirements.
The curative has a low level of toxicity, which lowers worker risk in industrial settings with routine exposure controls.
The new material is one of a number of Lonzacure products for polyurethane/polyurea applications.
Lonzacure P-25 liquid has controlled reactivity because it incorporates a carefully selected side group and the molecule is sterically hindered.
This chemical structure helps formulators control the cure rate on high-speed spray machines and low-pressure spray applications. It is also designed to improve the film properties of room temperature castable systems.
The material offers opportunities for applicators to use it in systems on low-pressure machines with a modified gun mixing unit.
This could be beneficial for applicators because the capital cost of low pressure…