Light wood-based materials having good mechanical properties and low formaldehyde emission

摘要

Light, wood-containing material with an average density of 200-600 kg/m 3>, comprises: (a) 30-95 wt.% of wood particles; (b) 1-15 wt.% of filler having a bulk density of 10-100 kg/m 3>comprising foamable plastic particles and foamed plastic particles; (c) 3-50 wt.% of a binder comprising an aminoplastic resin and organic isocyanate having at least two isocyanate groups; and optionally (d) additives. Independent claims are included for: (1) a multilayered wood material comprising at least three layers, where the middle layer or at least a part of the middle layer contains the light, wood-containing material and the outer layer contains no fillers; (2) the preparation of light, wood-containing material, comprising mixing the components of (a) to (d) and subsequently pressing under increased temperature and pressure; and (3) the preparation of the multilayered wood material, comprising coating the components of (a) to (d) for a single layer one upon the other and pressing under increased temperature and pressure.