Combinations of Low Formaldehyde-Aminoplast Glues and PMDI

摘要: Abstract Basic research on the formaldehyde emission from aminoplast-bonded particleboard has led to conclusion that F-emission is essentially governed by gross molar ratio of NH2 equivalents in material. From this starting point a new approach was chosen development glue for low-F-emission boards: such level effective F/NH2 UF or UMF standards can be met, following which methods additives are developed bring mechanical quality back an acceptable level. It shown addition approx. 10% polymeric isocyanate (PMDI) meet our purpose commercially basis. The performance system, using different UMF/PMDI compositions over range levels, described. An indication given possibilities and limitations system commercial practice.