摘要： 【目的】传统环氧树脂主要依赖石化资源，存在不可持续性、碳排放量大和主要原料双酚 A具有生物毒性等问题，并且其难降解和难回收的特性会导致资源浪费以及加重生态负担。为满足环保和可持续发展的要求，亟需寻找石油基树脂的可持续替代品。【方法】采用衣康酸衍生的环氧树脂（EIA）和水溶性柠檬酸（CA）作为固化剂，开发了一种生物基、可回收且可去除的环氧树脂。通过改变 EIA与 CA的物质的量比进行固化，获得了生物基环氧树脂涂层。【结果】所得涂层具有出色的耐溶剂性和优异的力学性能，其拉伸强度和玻璃化转变温度（Tg）分别为 63 MPa和 55 ℃。涂层的铅笔硬度和附着力分别达到 6H和 4B。此外，通过调控碱溶液，可高效回收酸性固化剂，并可重新用于固化 EIA。更重要的是，该环氧树脂涂层具有可去除性。【结论】研究结果表明，此生物基环氧树脂在涂料领域具有作为高性能、可持续材料的应用潜力。
关键词:
生物基,
环氧树脂,
可去除涂层,
可回收
Abstract: ［Objective］ Mainly relying on petrochemical resources，traditional epoxy resins present issues such as unsustainability，high carbon emissions，and the biotoxicity of the main raw material bisphenol A. Moreover，their characteristics of being difficult to degrade and recycle can leadto resource waste and exacerbate the ecological burden. Under the current situation，the development oftraditional epoxy resins faces numerous challenges. In order to address these challenges and meet therequirements of environmental protection and sustainable development，there is an urgent need to find sustainable alternatives to petroleum-based resins.［Methods］Itaconic-acid-derived epoxy resins（EIA） and water-soluble citric acid（CA，as curing agents） were used to develop a bio-based， recyclable，and removable epoxy resins. By carrying out the curing process by varying the molar ratio of EIA to CA，bio-based epoxy resin coating was obtained.［Results］The epoxy resins coating exhibited excellent solvent resistance and outstanding mechanical properties，with a tensile strength of 63 MPa and a glass-transition temperature（Tg） of 55 ℃ . The pencil hardness and adhesion of the coating reached 6H and 4B respectively. By adjusting the alkaline solution，the acidic curing agent could be efficiently recycled and reused to cure EIA. More importantly，this epoxy resins coating was removable.［Conclusion］The research results indicate that this bio-based epoxy resin holds the potential forapplications as a high-performance and sustainable material in the coatings field.
Key words:
bio-based,
epoxy resin,
removable coating,
recyclable
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