Comparative study on the efficacy of biobased wood preservative over conventional wood preservatives against fungi and termites
The current focus of wood preservation research is on developing wood preservatives from natural and environmentally compatible compounds for industrial application. Liquefaction of wood is one of the promising approaches to utilize woody waste where the wood meal is converted into a chemically active liquid with the help of a liquefying agent like polyhydric alcohols, phenol, cresol, and plant-based solvent as CNSL and Cardanol. Conventional wood preservatives like CCA, ASCU, Creosote, Chlorpyriphos based temic and termisel as synthetic chemicals were in use for a long time, has also been used in prescribed proportion. The efficacy and economic suitability of liquefied wood as a wood preservative along with conventional wood preservative against termite and fungi have been studied. Wood samples were impregnated with both conventional and liquefied wood diluted with methanol and were subjected and evaluated as per Bureau of Indian Standards (BIS) in terms of its antifungal (IS4873, Part I:2008) and termiticidal activities (IS4833:1993) accelerated termite graveyard test and fungal resistance test. The level of impregnation of liquefied wood in wood was estimated by determining the weight percent gain. In the graveyard test, samples were periodically observed for 24 months. The results indicated that Samples treated with phenol-assisted liquefied wood, CNSL based wood polyols, Cardanol based polyols exhibited better results as compare to conventional synthetic wood preservatives both in visual observation and percentage weight loss as compare to initial condition and untreated control samples. The percentage weight loss of liquefied wood polyols (phenol, CNSL, and cardanol individually) treated wood sample was ranging from only 5-20% of its initial weight; wood treated with preservatives (CCA, ASCU, Creosote and chlorpyriphos) shows % weight loss varied from 40- 60% and did not exhibit better resistance against termite and fungi as compared to the untreated samples. The treated samples were also exposed to fungus for 16 weeks. The fungicidal traits of liquefied wood polyols (phenolated, CNSL, and cardanol individually) treated wood showed higher antifungal efficacy against both white rot and brown rot of wood, conventionally wood treated preservatives (CCA, ASCU, Creosote and chlorpyriphos) shows low efficacy against termite and fungus. Since wood residue is a byproduct of primary and secondary wood processing industry whereas CNSL and Cardanol are by-products of Cashewnut processing unit, so its utilization as wood preservatives will be a value-added product to the wood-based Industry... Keywords: Preservatives, Impregnation, Liquefied wood, antifungal ID: 3625875
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| Format: | Article biblioteca |
| Language: | English |
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FAO ;
2022
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| Online Access: | https://openknowledge.fao.org/handle/20.500.14283/CC0975EN http://www.fao.org/3/cc0975en/cc0975en.pdf |
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