Material for panels strengthened by the cellulose fibers to be resistant to the boiling water, and to severe weather and method for its preparation

摘要

A binder for cellulose fiber reinforced board material comprising a mixture of: (a) a weakly alkaline phenol-formaldehyde condensate resin with a phenolic compound to formaldehyde mol ratio of 1:1.5 to 1:3.0, preferably of 1:1.8 to 1:2.7, and with an alkali content of /=15% by weight NaOH or KOH, related to the solids content of the resin; (b) a di- and/or poly-functional isocyanate in a quantity of from 5% to 25% by weight, related to (a); and (c) a tertiary alkyl and/or aralkyl amine and/or alkylene polyamine in a quantity of from 0.1% to 5% by weight, related to (a), a boiling water and weather resistant board material containing said binder and a process for the production of said board material.