| Abstrakt: |
Termites cause significant damage to wood-based structures in the Southeastern Unites States of America and Hawaii. Commonly used composites, such as waferboard must contain wood preservatives when used in these areas. In-line addition during blending of the furnish is the preferred approach for incorporating biocides into such composites.The effects on resin behaviour when adding three fungicides and two termiticides in different quantities to eight commonly used phenol-formaldehyde (PF) based resin and one polymeric diphenylmethane diisocyanate (pMDI) resin typically used for OSB and other composite manufacture, was assessed by monitoring the changes in viscosity and gelation time. The biocides were provided by Dr. Wolman GmbH, Germany. The termiticides were organics solutions based on bifenthrin, chlorfenapyr, and 5-amino-1-[2,6-dichloro-4-(trifluoromethyl)phenyl]-4-[(1R,S)-(trifluoromethyl)sulfinyl]-1H-pyrazol-3-carbonitrile (ATTC), while the fungicides were aqueous solutions based on K-HDO (N-cyclohexyldiazeniumdioxy potassium) or K-HDO and fenpropimorph.The fungicides were generally less compatible with the resins than the termiticides, in that they would likely to require some modification to the process used to manufacture the OSB with PF resin, and were found to be incompatible with the pMDI-resin. The bifenthrin based termiticide was compatible with 6 of the 8 PF-resins tested at the concentrations examined. The chlorfenapyr based termiticide was less compatible, (only 3 of the PF-resins) while the remaining 5 PF-resins were incompatible at any concentration. The ATTC based termiticide was compatible with only three of the PF-resins. |
