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IMPREGNATION OF RUBBERWOOD AND OTHER MALAYSIAN TIMBERS WITH COPPER NAPHTHENATE AND TRIMETHYL BORATE.

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Title: IMPREGNATION OF RUBBERWOOD AND OTHER MALAYSIAN TIMBERS WITH COPPER NAPHTHENATE AND TRIMETHYL BORATE.
Authors: Muhammed, S.1,2, Musgrave, O. C.1 o.c.musgrave@abdn.ac.uk, Petty, J. A.3
Source: Journal of Tropical Forest Science. Oct2009, Vol. 21 Issue 4, p345-352. 8p. 2 Diagrams, 3 Charts, 2 Graphs.
Subjects: Rubber additives, Non-timber forest products, Copper naphthenate, Trimethyl ammonium compounds, Wood preservatives, Preservation of wood
Geographic Terms: Malaysia
Abstract (English): The objective of this study was to determine the distribution of copper naphthenate and trimethyl borate within four Malaysian woods, namely, rubberwood, kempas, keruing and dark red meranti. The impregnation of end-sealed blocks of rubberwood and kempas by copper naphthenate in white spirit was much more rapid, and the fractions of the void volumes filled were greater than was observed with keruing and dark red meranti. After oven-drying all four species treated showed higher concentrations of copper in the peripheral regions of the blocks compared with the centre. Kempas contained an extractive which formed a brown copper complex. Gaseous trimethyl borate (MeO)3B and its methanol azeotrope (MeO)3B,MeOH were absorbed by end-sealed rubberwood blocks having moisture contents below the fibre saturation point with the formation, initially, of boric acid and methanol. After oven-drying the boric acid equivalent (BAE) of the peripheral region of the blocks was greater than that of the central portion and the gaseous azeotrope had higher values than the pure ester. The use of the liquid azeotrope resulted in higher BAE values. After being oven-dried the weight increase of treated blocks suggested that the final impregnation product was not boric acid itself but a mixture of esters formed from boric acid and the polyhydroxy components of the wood. Only part of the water present in the wood appeared to react with trimethyl borate, the rest presumably being sequestered in the microvoids of the cell walls. [ABSTRACT FROM AUTHOR]
Abstract (Malay): Tujuan kajian ini adalah untuk menentukan taburan pengawet kuprum naftenat dan trimetil borat dalam empat spesies kayu dari Malaysia iaitu kayu getah, kempas, keruing dan Shorea sp. Blok kayu getah dan kempas yang dipateri hujung-hujungnya menunjukkan kadar impregnasi oleh kuprum naftenat dalam spirit putih yang lebih cepat berbanding keruing dan Shorea sp. Pecahan isi padu lompang yang terisi juga lebih tinggi bagi kedua-duanya. Selepas dikering dalam ketuhar, keempat-empat spesies menunjukkan kepekatan kuprum yang lebih tinggi di bahagian pinggir blok berbanding dengan bahagian tengah. Kempas mempunyai hasil ekstraktif yang membentuk kompleks kuprum berwarna perang. Trimetil borat bergas (MeO)3B dan azeotrop metanol (MeO)3B,MeOH diserap oleh blok kayu getah yang dipateri hujungnya dan mempunyai kandungan lembapan di bawah tahap tepu gentian dan pada awalnya membentuk asid borik serta metanol. Selepas dikering dalam ketuhar, kandungan asid borik setara (BAE) bahagian pinggir lebih tinggi daripada bahagian tengah dan sebahagian besar daripadanya dihasilkan oleh azeotrop bergas berbanding ester tulen. Penggunaan azeotrop cecair menghasilkan nilai BAE yang lebih tinggi. Selepas dikering dalam ketuhar, peningkatan berat blok yang dirawat mencadangkan bahawa hasil impregnasi akhir bukanlah asid borik tetapi sebaliknya merupakan campuran ester yang terbentuk daripada asid borik dan komponen polihidroksi kayu. Nampaknya tidak semua air dalam kayu bertindak balas dengan trimetil borat; sebahagiannya diandaikan telah tersimpan dalam lompang mikro di dinding sel. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:The objective of this study was to determine the distribution of copper naphthenate and trimethyl borate within four Malaysian woods, namely, rubberwood, kempas, keruing and dark red meranti. The impregnation of end-sealed blocks of rubberwood and kempas by copper naphthenate in white spirit was much more rapid, and the fractions of the void volumes filled were greater than was observed with keruing and dark red meranti. After oven-drying all four species treated showed higher concentrations of copper in the peripheral regions of the blocks compared with the centre. Kempas contained an extractive which formed a brown copper complex. Gaseous trimethyl borate (MeO)3B and its methanol azeotrope (MeO)3B,MeOH were absorbed by end-sealed rubberwood blocks having moisture contents below the fibre saturation point with the formation, initially, of boric acid and methanol. After oven-drying the boric acid equivalent (BAE) of the peripheral region of the blocks was greater than that of the central portion and the gaseous azeotrope had higher values than the pure ester. The use of the liquid azeotrope resulted in higher BAE values. After being oven-dried the weight increase of treated blocks suggested that the final impregnation product was not boric acid itself but a mixture of esters formed from boric acid and the polyhydroxy components of the wood. Only part of the water present in the wood appeared to react with trimethyl borate, the rest presumably being sequestered in the microvoids of the cell walls. [ABSTRACT FROM AUTHOR]
ISSN:01281283