NDLI: Efficacy of wood preservatives formulated from okara with copper and/or boron salts

Content Provider	Springer Nature Link
Author	Ahn, Sye Hee Oh, Sei Chang Choi, In Gyu Kim, Ho Yong Yang, In
Copyright Year	2008
Abstract	As a substitute for high-cost copper azole (CuAz) and alkaline copper quaternary (ACQ) wood preservatives, alternative wood preservatives were formulated with okara, which is an organic waste from the production of tofu, and copper chloride and/or borax. Each preservative was used in treatment of wood blocks in a reduced-pressure method to measure its treatability. The treated wood blocks were placed in hot water for 3 days to examine the stability of the preservatives against hot-water leaching. The preservatives successfully penetrated into wood blocks, probably due to the use of ammonium hydroxide as a dissociating agent. However, the stability of okara-based preservatives dropped as the concentration of acid in the solutions used for hydrolysis of okara increased. The treatability and leachability of the preservatives were not affected by hydrolysis temperature but were negatively affected by the addition of borax. Leached wood blocks treated with okara-based preservatives and exposed to decay fungi Gloeophyllum trabeum and Postia placenta over 12 weeks showed good decay resistance. Okara-based wood preservatives can protect wood against fungal attack as effectively as CuAz, and have potential for use as environmentally friendly wood preservatives.
Starting Page	495
Ending Page	501
Page Count	7
File Format	PDF
ISSN	14350211
Journal	Journal of Wood Science
Volume Number	54
Issue Number	6
e-ISSN	16114663
Language	English
Publisher	Springer Japan
Publisher Date	2008-09-13
Publisher Place	Japan
Access Restriction	Subscribed
Subject Keyword	Okara Wood preservatives Leachability Treatability Decay resistance Characterization and Evaluation of Materials Materials Science Wood Science & Technology
Content Type	Text
Resource Type	Article
Subject	Biomaterials Forestry

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