公开(公告)号：US20170361580A1

公开(公告)日：2017-12-21

申请号：US15534181

申请日：2015-12-09

Applicant: BASF SE

Inventor： STEPHAN WEINKÖTZ ,  Detlef KRUG ,  Marco MÄBERT

IPC: B32B21/08 ,  C08F212/08 ,  C08L97/02 ,  B27N3/18 ,  B27N3/24 ,  B32B21/02

Abstract: The present invention relates to a process for the batchwise or continuous, preferably continuous production of single-layer lignocellulose-based boards or of multilayer lignocellulose-based boards with a core and with at least one upper and one lower outer layer,comprising the following steps: a) mixing of the components of the individual layer(s), b) layer-by-layer scattering of the mixtures to give a mat, c) compaction after the scattering of the individual layer(s), d) application of a high-frequency electrical field, during and/or after the compaction and thermal hardening of the binder(s), e) then optionally hot pressing, and f) cooling the lignocellulose material, where, in step a),for the core or the single layer, the lignocellulose particles A) [component A)] are mixed with B) from 0 to 25% by weight of expanded plastics particles with bulk density in the range from 10 to 150 kg/m3 [componeent B)],, C) from 1 to 15% by weight of one or more binders selected from the group consisting of aminoplastic resin and organic isocyanate having at least two isocyanate groups [component C)], D) from 0 to 3% by weight of ammonium salts [component D)], E) from 0 to 5% by weight of additives [component E)] and F) from 0.1 to 3% by weight of alkali metal salts or alkaline earth metal salts from the group of the sulfates, nitrates, halides and mixtures of these [component F)], and optionally for the outer layers, the lignocellulose particles G) [component G)] are mixed with H) from 1 to 15% by weight of one or more binders selected from the group consisting of aminoplastic resin and organic isocyanate having at least two isocyanate groups [component H)], I) from 0 to 2% by weight of ammonium salts [component I)], J) from 0 to 5% by weight of additives [component J)] and K) from 0.1 to 3% by weight of alkali metal salts or alkaline earth metal salts from the group of the sulfates, nitrates, halides and mixtures of these [component K)], wherein at the juncture Z the temperature of the layer of the core or of the single layer is more than 90°C., and this temperature is reached in less than 40 s/mm d after the application of the high-frequency electrical field, where d is the thickness of the sheet of lignocellulose material at the juncture Z.