Non-toxic, zero emission tannin-glyoxal adhesives for wood panels

Ballerini, Aldo; Despres, A.; Pizzi, A.

doi:10.1007/s00107-005-0048-x

Cited by 150 publications

(78 citation statements)

References 3 publications

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“…Modification UF with the use of various natural derived materials like tannin, lignin, cellulose, crude pyrolysis oil of wood, and soy have been carried out [54] [55] [56] [57]. Also combination of UF and MF is used for plywood industries.…”

Section: Other Polymer Additionmentioning

confidence: 99%

Factor Affecting Gel Time/Process-Ability of Urea Formaldehyde Resin Based Wood Adhesives

Gadhave¹,

Mahanwar²,

Gadekar³

2017

OJPChem

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Urea-formaldehyde (UF) resin presents the most utilized adhesive system in the manufacture of plywood, particleboard and fiberboard. At the temperatures above 100˚C in the presence of hardener, this resin undergoes crosslinking reaction and the formation of three dimensional cross linked structures takes place and bonding of wood particles in a hot press [1]. UF powder resins show high reactivity and good performance in the production and by their low price; however they lack in water resistance of the hardened resin [2]. Urea-formaldehyde (UF) resins are the most important type of adhesive resins for the production of wood based panels but process-ability and curing behavior of urea formaldehyde resin depended on various factors related to resin properties, types of wood and their properties, amount & type of catalyst, types and amount of polymers addition and environmental conditions [3]. This factor decides the process-ability of UF resin based composite during manufacturing of plywood, particle board and fiberboard. In this review paper, various factors affecting gel time and process-ability of UF resin based wood composite are reviewed.

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Section: Other Polymer Additionmentioning

confidence: 99%

Factor Affecting Gel Time/Process-Ability of Urea Formaldehyde Resin Based Wood Adhesives

Gadhave¹,

Mahanwar²,

Gadekar³

2017

OJPChem

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“…Lignin is polyphenolic and contains an unsubstituted carbon at either the C3 or C5 position on the aromatic ring. It also contains free phenolic and aliphatic hydroxyl groups that can form a quinone methide intermediate, which reacts with an aldehyde, tannin, phenol, or isocyanate group with heating under alkaline conditions (Ballerini et al 2005;El Mansouri 2007a;Abdelwahab and Nassar 2011;Mansouri et al 2011). Due to these chemical characteristics, lignin is a good starting material for wood adhesives (Cetin and Ozmen 2002;Cavdar et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Thermal Stability of Glyoxalated Alkali Lignin-Polyvinylpyrrolidone Resins

et al. 2016

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Natural, renewable, and non-toxic lignin-based resin was synthesized through copolymerization with monomeric N-vinyl-2-pyrrolidone (VP) in the presence of benzoyl peroxide (BPO) as the free radical initiator. Glyoxalated lignin was used as the feedstock. The mechanism of copolymerization between the glyoxalated alkali lignin and VP monomer was determined through Fourier-transform infrared spectroscopy (FT-IR). The optimum amount of VP monomer used and the reflux time required in the synthesis process were determined through thermogravimetric analysis (TGA). In the presence of BPO, copolymerization between glyoxalated alkali lignin and VP monomer was accomplished via the formation of ether linkages in a condensation reaction at pH 7.0. More ether linkages were formed with higher amounts of VP monomer and longer reflux times. The addition of VP monomer into glyoxalated alkali lignin increased its thermal stability. FT-IR and TGA indicated that 0.012 moles of VP monomer and an 8-h reflux time were optimum conditions for the synthesis of glyoxalated alkali lignin-polyvinylpyrrolidone resins.

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“…Another environmental concern is the control of volatile and semivolatile compounds derived mainly from adhesives (resins). Natural resins based on lignin (Lei et al 2007;Mansouri et al 2007a) or tannin (Garnier et al 2002;Ballerini et al 2005) are options for environment-friendly products.…”

Section: Introductionmentioning

confidence: 99%

Mechanical potential of eco-OSB produced from durable and nondurable species and natural resins

Stürzenbecher¹,

Bardet²,

Hofstetter³

et al. 2010

Holzforschung

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Oriented strand board (OSB) panels were manufactured with different mixtures of pine and cypress heartwood and resins based on lignin or tannin to develop an eco-friendly wood composite with a natural durability against termite and fungi. Some physical properties and the major elastic moduli of bulk wood as well as of the manufactured panels were determined using different measurement techniques. In addition, a micromechanical model was adapted and validated with the experimental results. The good agreement obtained between the experimental data and model predictions indicates the proper assessment of the most influential parameters, such as raw material and adhesive properties, strand orientation, layer assembly and density profile. A parameter study, enlightening the effect of strand orientation on several elastic constants, enlarges the scope of experiments. We conclude with an optimal combination of resin and wood species mixture resulting in the best performance from a biological and mechanical standpoint.

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Non-toxic, zero emission tannin-glyoxal adhesives for wood panels

Cited by 150 publications

References 3 publications

Factor Affecting Gel Time/Process-Ability of Urea Formaldehyde Resin Based Wood Adhesives

Factor Affecting Gel Time/Process-Ability of Urea Formaldehyde Resin Based Wood Adhesives

Synthesis and Thermal Stability of Glyoxalated Alkali Lignin-Polyvinylpyrrolidone Resins

Mechanical potential of eco-OSB produced from durable and nondurable species and natural resins

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