Hou Minghui, Zhou Xiaojian, Du Guanben, Pizzi Antonio, Essawy Hisham, Zhang Qianyu, Wu Dan, Yan Ranjun, Xi Xuedong
Yunnan Key Laboratory of Wood Adhesives and Glued Products, College of Material science and Chemistry Engineering, Southwest Forestry University, 650224 Kunming, China.
School of Chemistry and Material Engineering, Zhejiang A&F University, 311300 Hangzhou, China.
Int J Biol Macromol. 2024 Jun;269(Pt 1):132043. doi: 10.1016/j.ijbiomac.2024.132043. Epub 2024 May 1.
Starch adhesive is a commonly used bonding glue that is sustainable, formaldehyde-free and biodegradable. However, there are obviously some problems related to its high viscosity, poor water and mildew resistance. Hence, exploring a starch-based adhesive with good properties that satisfies the requirements of wood processing presents the context of the current research. Thus, corn starch was used as raw material to form oxidized starch (OCS) via oxidation using sodium periodate, it was reacted with a synthesis polyurea compound that prepared from hexanediamine-urea (HU) obtained by deamination to yield a oxidized starch-hexanediamine-urea adhesive (denoted hereafter as OCSHU). The oxidation process was optimized in terms of oxidant concentration, reaction time and temperature. Furthermore, the impact of HU addition on the mechanical properties of the adhesive was explored. Results indicate adhesive exhibited outstanding shear strength, when 13 % of NaIO was used as an oxidant to treat starch at 55 °C for 24 h, and involved in a subsequent reaction with 40 % of HU. The dry shear strength, 24 h cold water strength, 3 h hot water strength and 3 h boiling water strength are 1.84, 1.50, 1.32, and 1.31 MPa. Meantime, OCSHU adhesive solution revealed good storage stability whereas cured resin exhibited mildew resistance. The developed adhesive is a simple and green biomass wood adhesive.
淀粉胶粘剂是一种常用的粘结胶，具有可持续、无甲醛和可生物降解的特点。然而，它存在明显的问题，如高粘度、耐水性和防霉性差。因此，探索一种性能良好且满足木材加工要求的淀粉基胶粘剂成为当前研究的背景。于是，以玉米淀粉为原料，用过碘酸钠氧化形成氧化淀粉（OCS），使其与由己二胺 - 尿素（HU）经脱氨反应制备的合成聚脲化合物反应，得到氧化淀粉 - 己二胺 - 尿素胶粘剂（以下简称OCSHU）。在氧化剂浓度、反应时间和温度方面对氧化过程进行了优化。此外，还探讨了HU添加量对胶粘剂力学性能的影响。结果表明，当使用13%的NaIO作为氧化剂在55℃下处理淀粉24小时，并与40%的HU进行后续反应时，该胶粘剂表现出优异的剪切强度。其干剪切强度、24小时冷水强度、3小时热水强度和3小时沸水强度分别为1.84、1.50、1.32和1.31MPa。同时，OCSHU胶粘剂溶液具有良好的储存稳定性，固化树脂具有防霉性。所开发的胶粘剂是一种简单且绿色的生物质木材胶粘剂。
