Condensed tannins extraction from grape pomace: Characterization and utilization as wood adhesives for wood particleboard |
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| Authors: | Lan Ping Antonio PizziZhou Ding Guo Nicolas Brosse |
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| Institution: | a College of Wood Science and Technology, Nanjing Forestry University, Nanjing 210037, China
b Laboratoire d’Etude et de Recherche sur le MAteriau Bois, Faculté des Sciences et Techniques, Nancy-Université, Bld des Aiguillettes, F-54500 Vandoeuvre-lès-Nancy, France |
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| Abstract: | The extraction of condensed tannins from grape pomace was examined using water medium in the presence of NaOH, Na2CO3, NaHCO3 eventually in the presence of Na2SO3. The tannin fractions reactivity towards formaldehyde was studied by gel time analysis and thermomechanical analysis in bending and it was demonstrated that despite of their lower phenolic contents, some of these extracts displayed promising properties for adhesive applications. A resin formulation in which the total content of tannin is 75% of the total resin solids content gave good results and was employed for the elaboration of the first grape pomace based-wood particleboard which passed relevant international standard specifications for interior-grade panels. |
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| Keywords: | Tannins Grape pomace Adhesives Wood Agricultural residues |
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