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18-06-2018 | Original | Issue 5/2018

European Journal of Wood and Wood Products 5/2018

Investigation of modified water glass as adhesive for wood and particleboard: mechanical, thermal and flame retardant properties

Journal:
European Journal of Wood and Wood Products > Issue 5/2018
Authors:
Soo Jung Lee, Volker Thole
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Abstract

Water glass (WG) is an inorganic binder with excellent fire resistance in porous materials but has limited application to wood bonding. In this work, modified WG adhesive was developed and the effect of modification on the properties of adhesive and particleboard bonded with it was investigated. The bonding strength of WG adhesives increased by the modification with boric acid and aminofunctional silane. Stable siloxane linkage can lead to enhanced bonding. Particleboards with modified WG were manufactured with a target density of 750 kg m−3. The silane was selected as the best modifier; it was the only one to meet the requirements of EN 312 (Type 2). The reaction of amino groups onto the surface of wood was confirmed by Fourier-transform infrared spectrum. All particleboards produced with WG adhesives showed resistance to fire comparable to those with urea formaldehyde in the combustion test for 30 min. As a result of this investigation, WG modified with silane could be a desirable alternative to current synthetic adhesives for wood composites and fire resistance application.

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