Abstract

The development of plant adhesive with good bonding strength, water resistance and thermal stability remains challenging to replace formaldehyde-based adhesive resins that usually release toxic formaldehyde. Herein, an environmentally friendly bioadhesive derived from cottonseed meal waste and cellulose sawdust was successfully prepared, verified by FTIR and X-ray photoelectron spectroscopy detailed analysis. Pretreatment of cottonseed meal and sawdust at mild conditions was made to obtain cottonseed protein, purified and oxidized cellulose. Structure of these treated samples was characterized by particle size distribution, FTIR and wide angle X-ray diffraction. When adding 15% of the oxidized cellulose into cottonseed protein, the dry bonding strength of the resulting adhesive reached 2.4 MPa on average; and the highest wet bonding strength of 1.1 MPa was found when 10% dialdehyde starch was used. The improvements of bonding strength as well as thermal stability of the prepared oxidized cellulose/cottonseed protein adhesives are largely ascribed to the formation of strong chemical bonds and their mechanical interlocking with plywood substrates. Both protein-oxidized cellulose and protein-oxidized starch cross-linking networks are formed in the adhesive system, combining tightly the adhesive components. The biodegradable adhesive fabricated in work provides a new approach for the development of all-biomass derived adhesives with properties comparable to the state-of-the-art protein derived bioadhesives, thus holding great potential as an alternative to formaldehyde-based resins in wood board and indoor panel bonding industries.

Graphical abstract

中文翻译：

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棉籽蛋白和锯末纤维素胶合板生物胶的表征与性能

摘要

开发具有良好粘合强度、耐水性和热稳定性的植物粘合剂，以取代通常释放有毒甲醛的甲醛基粘合剂树脂仍然具有挑战性。本文以棉籽粕废料和纤维素锯末为原料，成功制备了一种环保型生物粘合剂，并通过 FTIR 和 X 射线光电子能谱详细分析验证。在温和条件下对棉籽粕和锯末进行预处理以获得棉籽蛋白、纯化和氧化纤维素。这些处理过的样品的结构通过粒度分布、FTIR和广角X射线衍射来表征。当棉籽蛋白中加入15%的氧化纤维素时，所得胶粘剂的干粘合强度平均达到2.4 MPa；最高湿粘合强度为1。当使用 10% 二醛淀粉时，发现 1 MPa。制备的氧化纤维素/棉籽蛋白粘合剂的粘合强度和热稳定性的提高主要归因于强化学键的形成及其与胶合板基材的机械互锁。蛋白质氧化纤维素和蛋白质氧化淀粉交联网络均在粘合剂系统中形成，将粘合剂组分紧密结合。在工作中制造的可生物降解粘合剂为开发全生物质衍生粘合剂提供了一种新方法，其性能可与最先进的蛋白质衍生生物粘合剂相媲美，因此具有作为木板中甲醛基树脂替代品的巨大潜力和室内面板粘合行业。制备的氧化纤维素/棉籽蛋白粘合剂的粘合强度和热稳定性的提高主要归因于强化学键的形成及其与胶合板基材的机械互锁。蛋白质氧化纤维素和蛋白质氧化淀粉交联网络均在粘合剂系统中形成，将粘合剂组分紧密结合。在工作中制造的可生物降解粘合剂为开发全生物质衍生粘合剂提供了一种新方法，其性能可与最先进的蛋白质衍生生物粘合剂相媲美，因此具有作为木板中甲醛基树脂替代品的巨大潜力和室内面板粘合行业。制备的氧化纤维素/棉籽蛋白粘合剂的粘合强度和热稳定性的提高主要归因于强化学键的形成及其与胶合板基材的机械互锁。蛋白质氧化纤维素和蛋白质氧化淀粉交联网络均在粘合剂系统中形成，将粘合剂组分紧密结合。在工作中制造的可生物降解粘合剂为开发全生物质衍生粘合剂提供了一种新方法，其性能可与最先进的蛋白质衍生生物粘合剂相媲美，因此具有作为木板中甲醛基树脂替代品的巨大潜力和室内面板粘合行业。

图形概要