Improved wet shear strength in eco-friendly starch-cellulosic adhesives for woody composites
Improved wet shear strength in eco-friendly starch-cellulosic adhesives for woody composites
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DOI：
10.1016/j.carbpol.2020.116884
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发表时间：
2020-12-15
影响因子：
11.2
通讯作者：
Chen, Nairong
中科院分区：
文献类型：
--
作者：
Yin, Hao;Zheng, Peitao;Chen, Nairong
近年来，利用可再生生物质开发环保型粘合剂引起了人们的广泛关注。在这里，我们提出了一种新方法，通过结合废报纸（WNP）粉末、氧化糯米淀粉和聚酰胺胺-环氧氯丙烷（PAE）来制备用于木质复合材料的无甲醛淀粉纤维素粘合剂（SCA）。氧化处理使淀粉中的羧基/羰基更容易被利用。采用最佳 SCA 与 50 wt% WNP 粉末粘合的胶合板显示出 0.83 MPa 的湿剪切强度，比氧化淀粉粘合剂高出 130.5 %。 FTIR分析表明，在SCA固化过程中，氧化淀粉和WNP纤维通过酯键和醚键参与与PAE的交联反应。所得固化粘合剂具有增强的晶体结构、热性能、疏水性、湿内聚力、流变性能和对木材的粘合性。 SCA 在木质复合材料中显示出作为甲醛衍生粘合剂的替代品的巨大潜力。
Development of eco-friendly adhesives from renewable biomass has attracted considerable attention in recent years. Here, we present a novel approach via combination of waste newspaper (WNP) powder, oxidized glutinous rice starch, and polyamidoamine-epichlorohydrin (PAE) to prepare a formaldehyde-free starch-cellulosic adhesive (SCA) for woody composites. The oxidation treatment made the carboxyl/carbonyl groups more available in starch. Plywood bonded by the optimum SCA with 50 wt% of the WNP powder showed a wet shear strength of 0.83 MPa exceeding that of the oxidized starch adhesive by 130.5 %. During the curing process of SCA, the oxidized starch and WNP fiber participated into the crosslinking reaction with PAE via ester and ether bonds, as evidenced by FTIR analysis. The resulting cured adhesive had enhanced crystalline structures, thermal properties, hydrophobicity, wet-cohesion, rheological properties, and adhesiveness to wood. The SCA showed great potential in wood composites as an alternative to formaldehyde-derived adhesives.