Preparation and application of formaldehyde-free polymer adhesive

The urea and two active compounds were concentrated to prepare ULR resin,and the ULR resin as an adhesive for plywood was studied by manufacturing plywood,testing its bond strength,and measuring its formaldehyde emission.The experimental results indicated that the polymerization time had little or no effect on the properties of ULR resin at given reaction condition,but the flour amount had great effect on the bond strength of plywood.The plywood bond strength by ULR resin with 120 min polymerization time and 15% flour additive could meet the requirement of GB standard,and the plywood emitted little or no formaldehyde.Thus it is possible to use ULR resin as an adhesive for plywood.