Acceleration of the fixation of chromated wood preservatives by UV-radiation

IRG/WP 3544

H M Illner, H Willeitner, K Brandt

Preliminary laboratory tests demonstrated that the fixation of chromated water-borne wood preservatives may be accelerated by UV-radiation. The degree of fixation depends on the intensity of radiation and the prevailing temperature. Three hours radiation at 20°C in a device for artificial weathering diminished the leaching of chromium to 43% and of copper to 23% compared to not-radiated samples. Two hours radiation at 60°C gave almost complete fixation. Five to seven seconds radiation in a high energetic commercial plant for hardening of paints diminished the leaching of chromium to 75% and of copper to 30% and a second radiation of the same samples still increased the fixation. Further tests are necessary to obtain more details on the use of UV-radiation for fixation in practice.


Keywords: ACCELERATED FIXATION; CCB; FIXATION; RADIATION INTENSITY; CHROMIUM; TEMPERATURE; UV RADIATION; WATER-BORNE PRESERVATIVES

Conference: 89-05-22/26 Lappeenranta, Finland


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