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Holz als Roh- und Werkstoff (2005) 63: 266-271 DOl 10.1007/500107-004-0550-6

F ITF NOR I(if NAt.

I. B. Jusoh . P. Nzokou . P. Kamdem

The effect of silicone on some properties of flakeboard

Published online: 30 April 2005

© Springer-Verlag 2005

Abstract Waxes are used as water repellent in wood composites, and there are only limited alternative water­

repellent systems for wood composites. The aim of this study was to investigate the effectiveness of a silicone compound as a water repellent for flakeboard and to compare the properties of boards made with silicone treated flakes to those made with commercial wax treated flakes. Three levels of silicone and wax applica­

tion rates were used (0.25, 0.5, and I %). The hydro­

phobic nature of silicone-treated flakes was evaluated by measuring the contact angle and the rate of water absorption (W A) on the surface of the wood flake. The internal bonding strength (IB), the modulus of elasticity (MOE) and modulus of rupture (MOR) in bending re­

gime, the W A, and the thickness swelling at edges of boards were evaluated. Results obtained showed that IB, MOE and MOR decreased as the concentration of sili­

cone on the flakes increased from 0.25% to 1%. The IB, MOE and MOR of panels made with 0.25% silicone­

treated flakes were comparable to boards made with 1%

wax-treated flakes. Thickness swell at edges and WA were significantly reduced as the amount of silicone in­

creased. No significant difference was found for the thickness swelling at edges and the W A between panels made with I% silicone-treated flakes and 1% wax­

treated flakes. The silicone treated flakes had high water repellency.

1. B. Jusoh

Faculty of Resource Science and Technology, University Malaysia Sarawak,

94300 Kota Samarahan, Sarawak, Malaysia P. Nzokou' P. Kamdem (21)

Department of Forestry, Michigan State University,

126 Natural Resources, East Lansing, MI 48824, USA

E-mail: [email protected]

Einfluss von SHikon auf einige Eigenschaften von Spanplatten

Zusammenfassung Wachse werden ublicherweise als wasserabstoBende Mittel in Holzwerkstoffen verwendet, und es gibt nur begrenzte alternative Chemikalien, urn einen wasserabstoBenden Effekt in Komposit-Werkst­

offen zu erzie1en. Zie1 dieser Studie war es, die wasse­

rabstoBende Wirksamkeit von Silikonen zu prUfen und die Eigenschaften der so hergestellten Platten mit ko­

mmerziellen wachs-behandelten zu vergleichen. Drei Bereiche von Silikon- und Wachs-Anteilen wurden ge­

proft (0,25, 0,5 und 1 %). Die hydrophoben Eigens­

chaften der mit Silikon behandelten Spane wurde abgeschiitzt mittlels Kontaktwinkel-Messung und anhand des AusmaBes der Wasseradsorption an der Oberflache der Spane. Gemessen wurde die Quer­

zugfestigkeit (IB), MOE, MOR (Biegung), die Wasser­

absorption sowie die Dickenquellung an den Kanten der Platten. Es zeigte sich, dass IB, MOE und MOR abfie­

len, wenn die Konzentration an Sihkon von 0,25 auf 1 % anstieg. IB, MOE und MOR von Platten aus Spanen mit 0,25% Silikon waren vergleichbar mit Platten, deren Spane mit 1 % Wachs behandelt waren. Dickenquellung und Wasserabsorption zeigten sich mit steigendem Sili­

kongehalt deutlich erniedrigt. Platten, die aus Spanen mit 1 % Silikon- oder 1 % Wachs-Behandlung hergestellt waren, zeigten keinen signifikanten Unterschied in der Dickenquellung. Die Wasserabstonung war bei Silikon­

behande1ten Spane hoher.

1 Background

Recently, considerable efforts have focused on the development of water-resistant wood composites suit­

able for exterior applications (Chambers and Kamdem 1998; May and Roaffael 1984). The addition of water­

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