Open Access

ARTICLE

Self-Cross-Linked Tannin-Aminated Tannin Surface Coatings for Particleboard

by Bengang Zhang^1,*, Antonio Pizzi^2,*, Mathieu Petrissans¹, Anelie Petrissans¹, Colin Baptiste¹

1 LERMAB, I.U.T. Hubert Curien, University of Lorraine, Épinal, 88000, France
2 LERMAB-ENSTIB, University of Lorraine, Epinal, 88000, France

* Corresponding Authors: Bengang Zhang. Email: bengang ; Antonio Pizzi. Email:

Journal of Renewable Materials 2023, 11(12), 4097-4121. https://doi.org/10.32604/jrm.2023.029761

Received 07 March 2023; Accepted 14 April 2023; Issue published 10 November 2023

Abstract

Aminated tannins were prepared by reacting mimosa condensed tannin extract with ammonia yielding the substitution of many, if not all of the tannin hydroxyl groups with –NH₂ groups. A tannin-aminated tannin (ATT) particleboard coating was then prepared by reacting raw tannin extract with aminated tannin extract and thus cross-liking the two by substituting tannin’s hydroxyl groups with the –NH₂ groups on the aminated tannin to form –NH-bridges between the two. The resulting particleboard coating gave encouraging results when pressed at 180°C for 3 min. Conversely, the system in which tannin was reacted/cross-liked with urea (ATU) by a similar amination reaction did not perform as well as the ATT system, and this even when a higher curing temperature and longer hot press time were used. In particular its water repellence was worse probably due to the presence of urea and such a system lower reactivity. Nonetheless, substituting the tannin –OHs with the urea –NH₂ groups appeared to also take place. ATT gave better results than ATU as regards water repellence and mechanical resistance as shown by the cross cut test. The ATT system was shown to be between 95% and 98% biosourced. The difference appeared to be due, by TMA analysis, to the much faster formation of the ATT hardened network leading to a better cross-linked polymer coating. The chemical species formed for both the ATT and ATU system were studied by MALDI ToF and CP MAS ¹³C NMR.

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Keywords

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