Abstract
This study investigated the physical properties (rheological and thermogravimetric analysis) of cornstarch-tannin adhesives and the mechanical properties (dry tensile strength and 3-point bending strength) of plywood made using cornstarch-tannin adhesives. This adhesive was evaluated for its utility in interior plywood manufacture. The optimum cure temperature and cure time of cornstarch-tannin adhesives were 170°C and 4 min, respectively. Plywood bonded with formaldehyde-free cornstarch-tannin adhesive exhibited excellent mechanical properties comparable to commercially available phenol-formaldehyde plywood adhesives. It was found that cornstarch-tannin panels which do not contain formaldehyde and with an emission equal to that of heated but unbound wood can be obtained by the use of hexamethylenetetramine (hexamine) as hardener.
The work has indicated that an environmentally friendly wood adhesive can be prepared from a natural renewable resource (cornstarch and wattle tannin) for bonding interior-type plywood.
Zusammenfassung
In dieser Studie werden die physikalischen (rheologische und thermogravimetrische Analyse) sowie die mechanischen Eigenschaften (Trockenzugfestigkeit und 3-Punkt-Biegefestigkeit) von Sperrholz, das mit einem Maisstärke-Tannin-Klebstoff hergestellt wurde, untersucht. Dabei wurde der Klebstoff bezüglich seiner Brauchbarkeit für im Innenbereich verwendetes Sperrholz untersucht. Die optimale Aushärtungstemperatur dieses Klebstoffes lag bei 170°C und die Aushärtungszeit bei 4 min. Sperrholz, das mit einem formaldehydfreien Maisstärke-Tannin-Klebstoff verklebt wurde, wies ausgezeichnete mechanische Eigenschaften auf, die mit denjenigen von handelsüblichen Phenol-Formaldehyd-Sperrholzklebstoffen vergleichbar sind. Es hat sich gezeigt, dass Maisstärke-Tannin-Platten, die kein Formaldehyd enthalten und deren Emission der von erhitztem, nicht verklebtem Holz entspricht, mit Hexamethylentetramin (Hexamin) als Härter hergestellt werden können.
Die Arbeit hat gezeigt, dass aus einem natürlichen nachwachsenden Rohstoff (Maisstärke und Akazientannin) ein umweltfreundlicher Holzklebstoff für die Verklebung von Sperrholz für den Innenbereich hergestellt werden kann.
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References
Aldo Ballerini AD, Pizzi A (2005) Non-toxic, zero emission tannin-glyoxal adhesives for wood panels. Holz Roh- Werkst 63:477–478
Bryce DJ, Greenwood CT (1963) Aspects of the thermal degradation of starch. Starch/Stärke 15(5):166
Clark AH, Ross-Murphy SB (1987) Structural and mechanical properties of biopolymer gels. Adv Polym Sci 83:57–192
EN 310 (1993) Wood-based panels. Determination of modulus of elasticity in bending and of bending strength. The European committee for standardization
EN 314-1/-2 (1993) Plywood–bond quality, Part 1. Test methods. European Committee for Standardization, Brussels
Greenwood CT (1967) The thermal degradation of starch. Adv Carbohyd Chem Bi 22:483–515
Imam SH, Lijun M, Liang C, Greene RV (1999) Wood adhesive from crosslinked poly(vinyl alcohol) and partially gelatinized starch: preparation and properties. Starch/Stärke 51(6):225–229
Imam SH, Sherald HG, Lijun M, Liang C (2001) Environmentally friendly wood adhesive from a renewable plant polymer: characteristics and optimization. Polym Degrad Stabil 73:529–533
ISO/CD 12460-4 (2007) Wood-based panels – Determination of formaldehyde release – desiccator method. The European committee for standardization
Kamoun C, Pizzi A, Zanetti M (2003) Upgrading of MUF resins by buffering additives – Part 1: Hexamine sulphate effect and its limits. J Appl Polym Sci 90(1):203–214
Li K, Geng X, Simonsen J, Karchesy J (2004) Novel wood adhesives from condensed tannins and polyethylenimine. Int J Adhes Adhes 24:327–333
Mansouri HR, Pizzi A, Leban JM (2006) Improved water resistance of UF adhesives for plywood by small pMDI additions. Holz Roh- Werkst 64(3):218–220
Mansouri HR, Pizzi A (2007) Recycled micronized polyurethane powders as active extenders of UF and PF wood panel adhesives. Holz Roh- Werkst 65(4):293–299
Mozaffar AK, Sayed Marghoob A, Ved Prakash M (2004) Development and characterization of a wood adhesive using bagasse lignin. Int J Adhes Adhes 24:485–493
Nihat SC, Nilgül O (2002) Use of organosolv lignin in phenol-formaldehyde resins for particleboard production II. Particleboard production and properties. Int J Adhes Adhes 22:481–486
Pichelin F, Kamoun C, Pizzi A (1999) Hexamine hardener behaviour – effects on wood glueing, tannin and other wood adhesives. Holz Roh- Werkst 57(5):305–317
Pichelin F, Nakatani M, Pizzi A, Wieland S, Despres A, Rigolet S (2006) Structural beams from thick wood panels bonded industrially with formaldehyde-free tannin adhesives. Forest Prod J 56(5):31–36
Pizzi A (1977) Hot-setting tannin-urea-formaldehyde exterior wood adhesives. Adhess Age 20(12):27–35
Pizzi A (1994) Advanced wood adhesives technology. Marcel Dekker, New York
Pizzi A, Meikleham N, Dombo B, Roll W (1995) Autocondensation-based, zero-emission, tannin adhesives for particleboard. Holz Roh- Werkst 53:201–204
Pizzi A, Tekely P (1995) Mechanism of polyphenolic tannin resin hardening by hexamethylenetetramine: CP-MAS 13C NMR. J Appl Polym Sci 56:1645–1650
Pizzi A, Tekely P (1996) Hardening mechanisms by hexamethylenetetramine of fast-reacting phenolic wood adhesives – a CPMAS 13C NMR study. Holzforschung 50:277–281
Pizzi A, Tekely P, Panamgama LA (1996) A different approach to low formaldehyde emission aminoplastic wood adhesives. Holzforschung 50:481–485
Pizzi A (2000) Tannery Row – the story of some natural and synthetic wood adhesives. Wood Sci Technol 34(4):277–316
Pizzi A (2006) Recent developments in eco-efficient bio-based adhesives for wood bonding: opportunities and issues. J Adhes Sci Technol 20(8):829–846
Richardson S, Gorton L (2003) Characterisation of the substituent distribution in starch and cellulose derivatives. Anal Chim Acta 497:27–65
Ross-Murphy SB (1984) Rheological methods. In: Chan HW-S (ed) Biophysical methods in food research. Blackwell, Palo Alto, CA
Steffe JF (1996) Rheological methods in food process engineering. Freeman Press, East Lansing, MI
Thompson GE (1991) Demethylated kraft lignin as a substitute for phenol in wood adhesives. MS thesis, Colorado State University
Trosa A, Pizzi A (2001) A no-aldehyde emission hardener for tannin-based wood adhesives for exterior panels. Holz Roh- Werkst 59:266–271
Van Steene G, Masschelein-Kleiner L (1980) Modified starch for conservation purposes. Stud Conserv 25(2):64–70
Yoosup P, Dohertyb WOS, Halleya PJ (2008) Developing lignin-based resin coatings and composites. Ind Crop Prod 27:163–167
Yuan L, Kaichang L (2007) Development and characterization of adhesives from soy protein for bonding wood. Int J Adhes Adhes 27:59–67
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We gratefully acknowledge the financial support from the “Conseil Général des Landes” (Aquitaine, France).
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Moubarik, A., Allal, A., Pizzi, A. et al. Characterization of a formaldehyde-free cornstarch-tannin wood adhesive for interior plywood. Eur. J. Wood Prod. 68, 427–433 (2010). https://doi.org/10.1007/s00107-009-0379-0
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DOI: https://doi.org/10.1007/s00107-009-0379-0