Mimosa tenuiflora (Willd.) Poir. (MT) is an underutilized plant specie since its wood is mostly used for energy production. Nonetheless, the bark from this forest plant has a high amount of tannins and other valuable compounds. Tannins have high worldwide importance and, because of that, there is an increasing number of researches on biorefinery systems aiming at maximizing their exploitation. The present study evaluated tannins extracted from the MT bark and their use for producing wood adhesives. Three types of powdered tannins were extracted using different solvents: a pure aqueous solution, a 5% sodium hydroxide (NaOH) aqueous solution, and a 5% sodium bisulfite (NaHSO3) aqueous solution. Distilled water, wheat flour, and formaldehyde were also used as a solvent, a glue extender, and a catalyst, respectively. These adhesives were applied for bonding pine wood joints and their shear strengths were determined. All the MT-based adhesives showed high viscosities and, yielded glue lines with similar shear strengths and similar shear deformations if compared to each other. That tannin-based glue incorporated with the tannin extracted using NaOH or NaHSO3 stood out and yielded similar bonding performances if compared to a commercial adhesive applied as a positive control.

中文翻译：

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含羞草树皮单宁提取物：作为木胶的特性和前景

含羞草tenuiflora（威尔德）。（MT）是一种未被充分利用的植物，因为其木材主要用于能源生产。但是，这种森林植物的树皮含有大量的单宁酸和其他有价值的化合物。单宁酸在世界范围内具有很高的重要性，因此，针对生物精炼系统的研究越来越多，旨在最大程度地利用它们。本研究评估了从MT树皮中提取的单宁及其在生产木材胶粘剂中的用途。使用不同的溶剂提取了三种类型的单宁粉：纯水溶液，5％氢氧化钠（NaOH）水溶液和5％亚硫酸氢钠（NaHSO3）水溶液。蒸馏水，小麦粉和甲醛也分别用作溶剂，增胶剂和催化剂。将这些粘合剂用于粘合松木接缝，并确定其剪切强度。如果将彼此比较，所有基于MT的粘合剂都显示出高粘度，并产生具有相似剪切强度和相似剪切变形的胶线。与使用作为阳性对照的商业胶粘剂相比，与使用NaOH或NaHSO3提取的单宁结合的基于单宁的胶水脱颖而出，并产生相似的粘合性能。