Materials espumados polyurethane semi-rigid base poliisocionatos modified with biuret.Composite structural components using these materials espumados semi rigid polyurethane and a process for its production.

摘要

Invention patent: b "materials espumados polyurethane semi ru00ecgidos based poliisociantos modified with biuret.Composite structural components using these materials espumados semi ru00ecgidos polyurethane and a process for the production of " d .Polyurethane materials are described espumados, semi rigid, which have a density of 60.1 to 200 kg / m3.These materials espumados are available by reaction of (a) a poliisocianato component, which has an NCO content of from 30 to 47%.And which comprises a disocianato toluene which has a structure of biuret, and which has a value of NCO within the range of 33 to 47% by weight,(b) a polyester polyol component with an average molecular weight of 1000 to 12.000 and a feature 242 2, (c) from 0.5 to 8% by weight of water based on the total weight of components (b), (c), (d), (E) and (f), (d) optionally.An additional component of polyol with an average molecular weight of 62 to less than 1.000 and a feature 242 2, (E) optionally with substances admixtures, additives and flame retardants, additional known in technique, and optionally (F0, blowing agents,While it remains an isocyanate index of 30 to 180 with respect to the ratio of isocyanate groups in the component (a) to the sum of the reactive with isocyanate groups present in the components (b)And (f). A process for the production of such materials espumados and its use in composite structural components are also described.