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- Title
Developing an industrial friendly process for hydroxymethyl resorcinol (HMR) priming of wood using a novolak-based HMR.
- Authors
Eisenheld, Leopold; Gardner, Douglas J.
- Abstract
Creating exterior durable bonds to wood using epoxy adhesives or other nonaqueous adhesives often requires the application of a primer or coupling agent. For durable wood-to-wood and wood-to-fiber-reinforced-polymer (FRP) bonding, the use of a hydroxymethylated resorcinol (HMR) coupling agent is recommended as a primer, in this paper, an experiment aimed at reducing the processing time required for HMR priming using a novolak-based HMR primer and the application of infrared heat emitted from lamps is described. This experiment evaluated the sensitivity of the entire HMR-adhesive system by assessing important process variables including HMR drying time, spread rate, and solids content. The experiment utilized a quick, accurate, and widely used technique to evaluate both shear strength and percentage of wood failure: a compression shear block test. The best bonding performance was measured at a novolak-based HMR drying time between 15 and 20 minutes. Both test conditions showed a high shear strength combined with a high percentage of wood failure. Finally, this experiment contributed to the know ledge required for the development of an industrial friendly process using HMR as a wood primer.
- Subjects
WOOD testing; ADHESIVES; POLYMERS; LUMBER drying; PRESERVATION of wood
- Publication
Forest Products Journal, 2005, Vol 55, Issue 9, p61
- ISSN
0015-7473
- Publication type
Article