Bonding Quality of Chemically-Modified Soybean Protein Concentrate-Based Adhesives in Particleboards from Rice Husks

E. M. CIANNAMEA; J. MARTUCCI; P. M. STEFANI; R.A. RUSECKAITE

JOURNAL OF THE AMERICAN OIL CHEMISTS SOCIETY (JAOCS)

SPRINGER

Año: 2012 vol. 89 p. 1733 - 1741

0003-021X

Abstract The aim of the present study was to upgrade thebonding quality and water resistance of medium-densityparticleboards based on rice husks (RH) as a wood substituteand soybean protein concentrate (SPC) as the bindervia chemical modification of SPC. Alkali (A), citric acid(CA) and boric acid (BA) were used to modify proteins andthe carbohydrate complex in SPC. The effect of chemicaltreatment performed on SPC was followed by Fouriertransform infrared, differential scanning calorimetry,thermo-gravimetric analysis and initial apparent viscositymeasurements. Board properties were evaluated in terms ofinternal bond (IB) and physical properties. Results revealedthat boards bonded with SPC treated with boric acid,exhibited the highest IB and the lowest water absorptionand thickness swelling at 2 and 24 h, due to cross-linkingreactions with exposed OH-groups in the amorphous regionof cellulose of RH. Results demonstrate that boric acidmodified?SPC-bonded boards met the requirements of IBrecommended by the US Standard ANSI A208.1-2009 forM1, MS, M2 and M3-grade medium-density particleboardsbut failed to pass the thickness swelling required. Thisissue of BSPC-RH boards is compensated for by the benefitof being formaldehyde-free which makes them suitable forindoor applications.