An Analysis of Resin Efficiency in Particleboard

In the development and improvement of a urea-formaldehyde resin for particleboard the chemist is faced with the following sort of demands. It should be low enough in viscosity so it will not burden the resin application system. It must be high in solids so that the mat moisture can be held at acceptable levels. It must provide tack for the formed mat. It should be fast-curing so that the press time can be reduced to productive levels. It should not produce too much formaldehyde release, either at the hot press or as residual fume release in the finished board. It must have adequate storage life. The cure properties of the resin must be adapted to the natural acidity of the wood. The resin system used should be compatible with additives such as sizing agents, fire-proofing chemicals, termite poisons, and perhaps others. The resin should be efficient in terms of board strength. It must be general purpose in nature and must withstand the high temperature exposure which is encountered in the stack. It must be low in cost.

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