Use of Biocides and Soy Oil in Preservative Treatment of Structural Flakeboard

Qun Fang, Yanyan Zhao, Quanben Du, Monlin Kuo


Many uses of structural wood composite panels require preservative treatment to increase decay resistance. The most cost-effective way to treat structural flakeboard is done during manufacturing, but it is difficult to accomplish because of incompatibility between adhesive resins and preservatives. The objective of this study was to evaluate physical properties and decay resistance of flakeboard made with phenolic wood adhesive resins blended with biocides dissolved in soybean oil. The blended phenolic adhesive resins contained equal parts of iodo-propynyl butyl carbamate, propiconazole, and tebuconazole. Hybrid poplar flakeboards were made at the combined biocide retention levels of 0, 0.51, 0.81, and 1.63 kg/m3. Results indicated that the strength and dimensional stability properties of flakeboard were not affected by the in-process preservative treatment. The biocides were stable and maintained their efficacy against decay after pressing boards at 200°C for 7 min. Boards treated with 1.63 kg/m3 biocides sustained 2.5% to 5.0% weight loss after exposing to the brown-rot fungus (Postia placenta) for 12 wk compared with over 27% weight loss of nontreated boards.


Flakeboard;preservative treatment;biocides;soy oil;brown-rot decay

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