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Self-cross-Linked tannin-Aminated tannin Surface Coatings for Particleboard

Journal of Renewable Materials 2023年第12期11卷 4097-4121页

作者： Bengang Zhang Antonio Pizzi Mathieu Petrissans Anelie Petrissans Colin Baptiste LERMAB I.U.T.Hubert CurienUniversity of LorraineÉpinal88000France LERMAB-ENSTIB University of LorraineEpinal88000France

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–NH_(2)groups.A tannin-aminated tannin(ATT)particleboard coating was then prepared by reacting raw tannin extract with aminated tannin extract and thus cross-linking the two by substituting tannin’s hydroxyl groups with the–NH_(2)groups on the aminated tannin to form–NH-bridges between the *** resulting particleboard coating gave encouraging results when pressed at 180℃for 3 ***,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 *** particular its water repellence was worse probably due to the presence of urea and such a system with lower ***,substituting the tannin–OHs with the urea–NH_(2)groups appeared to also take *** gave better results than ATU as regards water repellence and mechanical resistance as shown by the cross cut *** ATT system was shown to be between 95%and 98%*** 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 *** chemical species formed for both the ATT and ATU system were studied by MALDI ToF and CP MAS^(13)C NMR.

关键词： Biocoatings particleboard aminated tannin cross-linked tannin-aminated tannin tannin-urea cross links water repellence cross cut test MALDI ToF ^(13)C NMR

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