The influence of copper (II) chemicals on the weathering of treated wood. Part 1: ACQ treatment of wood on its weathering
Ruiying Liu, J N R Ruddick, L Jin
Wood weathering can be accelerated by alkylammonium compound (AAC) treatment, and slowed by ammoniacal copper quat (ACQ) treatment. This study aims at investigating the influence of ACQ treatment of wood, especially the present of copper (II), on its weathering. ACQ, CCA and DDAC treated microtomed sections of southern yellow pine earlywood were prepared and naturally weathered for five periods, totally 35 days. The compositional changes in the weathered samples with preservatives, retention and exposure time were examined using FTIR spectroscopy. The FTIR spectra showed that ACQ treatment slowed wood photodegradation mainly via inhibiting the formation of carbonyls and delignification during weathering. 2% ACQ treatment provided effective protection against wood photo-oxidation.