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Polymeric Isocyanate as Wood Product Binders,
UPJOHN CO NORTH HAVEN CT DONALD S GILMORE RESEARCH LABS
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Polymeric isocyanates are receiving a great deal of attention as binders for the wood products industry due to their excellent bonding efficiency, fast press cycles, low binder requirements, long resin storage stability, and absence of formaldehyde. Polymeric isocyanates, being solvent-free liquids, may be utilized as is or emulsified with water in spray or centrifugal blender applications. Data are presented showing the rate of bond formation, though minimum press time, with polymeric isocyanate bound board is similar to that of a urea-formaldehyde binder. Mat moisture content has little effect on the reaction stoichiometry although it will change the density profile of the board significantly. And, the use of Fourier transform infrared shows the presence of both polyurethane and polyurea in the core of a polymeric isocyanate bound waferboard. Author
APPROVED FOR PUBLIC RELEASE