NDLI: Termite resistance and wood-penetrability of chemically modified tannin and tannin-copper complexes as wood preservatives

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Termite resistance and wood-penetrability of chemically modified tannin and tannin-copper complexes as wood preservatives

Content Provider	Springer Nature Link
Author	Yamaguchi, Haruhiko Yoshi, Kyoko Kido, Akiko
Copyright Year	2002
Abstract	We examined the ability of chemically modified tannin and tannin-copper complexes to penetrate wood and the ability of the treated wood to resist termites. Only the tannin-treated wood retained the agents after treatment. Wood with untreated mimosa tannin (MT) retained the least amount, followed by wood with resorcinolated tannin (RMT) and that with catecholated tannin (CMT). When RMT or CMT was mixed with ammonia-copper, the wood retained twice as much of these solutions as the MT -ammonia-copper solution. The degree of retention of RMT-NH3-Cu and CMT-NH3-Cu ranged from 268 to 326kg/m3. The solutions penetrated 2–13 mm from the tangential sections of the logs. We also measured the termite resistance conferred by these solutions. Most of the tannin-NH3-Cu solutions showed contact lethality for termites in the contact toxicity test. However, the termites were fed cellulose treated with those solutions and most survived the oral toxicity test (14 days). Moreover, these solutions reduced the amount of damage to the wood by termites. However, the mortality rate of the termites during the eating-damage test (>21 days) did not reach 100% for any of the solutions except for RMT. As a result of the field stake test with the same log's used for the penetrability test, the mass loss of wood treated with RMT or CMT alone or with RMT + NH3 + CuCl2, was about one-third to one-half that of the controls. Because these solutions have good wood penetrability and good termite resistance, they have potential use as low-toxicity wood preservatives.
Starting Page	331
Ending Page	337
Page Count	7
File Format	PDF
ISSN	14350211
Journal	Journal of Wood Science
Volume Number	48
Issue Number	4
e-ISSN	16114663
Language	English
Publisher	Springer-Verlag
Publisher Date	2002-01-01
Publisher Place	Tokyo
Access Restriction	Subscribed
Subject Keyword	Chemically modified condensed tannin Tannin-copper complex Penetrating ability Pressure treatment Termite resistance Wood Science & Technology Materials Science Characterization and Evaluation of Materials
Content Type	Text
Resource Type	Article
Subject	Biomaterials Forestry

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