Comparison of different foaming agents in making plywood glue

Abstract

Foaming of a phenol formaldehyde resin was studied. Twenty-one foaming agents were tried out in the experiments. Foaming was evaluated by viscosity, density, and surface tension measurements. The study shows that spray dried blood and ␤-lactoglobulin-enriched whey were the best foaming agents to foam phenol formaldehyde resin. There are also some other materials, which might work as foaming agents for phenol formaldehyde resin after some formula optimization. They include sodium lauryl sulfate, sodium-n-alkyl (C 10 -C 13 ) benzene sulfonate, and a fatty acid amine derivate.