Application of Citric Acid as Natural Adhesive for Wood
Application of Citric Acid as Natural Adhesive for Wood
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DOI：
10.1002/app.34708
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发表时间：
2012-02-15
影响因子：
3
通讯作者：
Kawai, Shuichi
中科院分区：
文献类型：
--
作者：
Umemura, Kenji;Ueda, Tomohide;Kawai, Shuichi
开发利用非化石资源的天然胶粘剂具有重要意义。此外，希望是安全的粘合剂而不使用有害的化学物质。本文研究了柠檬酸作为天然胶粘剂的应用。以马占相思树皮粉和柠檬酸粉为原料，研究了马占相思树皮粉的理化性质。将柠檬酸粉末与树皮粉末混合，并将所得粉末混合物倒入金属模具中。将模具在180 ℃和4 MPa下热压10分钟，然后获得树皮模制品。含有20wt%柠檬酸的模制品的断裂比模量和弹性模量值分别为18.1MPa和4.9GPa。在反复煮沸处理期间，模塑件没有分解。为明确单宁对树皮成型的影响，将树皮分为单宁和残渣。由于显著的流动性，在使用单宁时不能获得模塑，而在使用残渣时获得模塑，与使用树皮时相同。认为单宁以外的组分对单宁的稳定性有贡献。基于傅里叶变换红外光谱的结果，柠檬酸衍生的羧基与树皮中的羟基之间形成酯键被证实。因此，柠檬酸通过化学键合产生粘合力，可以作为一种安全的天然粘合剂。(C)2011 Wiley Periodicals，Inc.应用聚合物科学杂志123：1991-1996，2012
The development of natural adhesives derived from nonfossil resources is very important for the future. Besides, it is desirable to be safe adhesives without using harmful chemical substances. In this study, application of citric acid as a natural adhesive was investigated. Citric acid powder and bark powder obtained from Acacia mangium were used as raw materials. Citric acid powder was mixed with the bark powder, and the resulting powder mixture was poured into a metal mold. The mold was hot-pressed at 180 degrees C and 4 MPa for 10 min, and a bark molding was then obtained. The specific modulus of rupture and modulus of elasticity values of the molding containing 20 wt % citric acid were 18.1 MPa and 4.9 GPa, respectively. The molding did not decompose during a repeated boiling treatment. To clarify the effect of tannin on the adhesiveness of molding, bark was separated into tannin and residue. The molding was not obtained while using the tannin due to the marked fluidity, whereas it was obtained while using the residue, the same as while using the bark. It was considered that components other than tannin contributed to the adhesiveness. Based on the results of Fourier transform infrared spectra, the formation of ester linkages between carboxyl groups derived from citric acid and hydroxyl groups in the bark was confirmed. Accordingly, citric acid brought an adhesion by chemical bonding, and it could be used as a safe natural adhesive. (C) 2011 Wiley Periodicals, Inc. J Appl Polym Sci 123: 1991-1996, 2012