目的 针对绿色包装领域对可定制化高性能生物基材料的需求,制备一种兼具高动态刚度与稳态柔韧性的生物基光固化树脂,利用DLP型3D打印实现高精度包装结构件的精密制造。方法 利用DL-硫辛酸（LA）和丁香酚经酯化反应合成丁香酚硫辛酸酯（EugLp）,将其与LA单体共混构建光固化体系;通过流变、力学及动态热机械分析探究LA含量对性能的影响,评估其3D打印可行性。结果 EugLp/LAx树脂具有高生物基含量与低黏度,其光固化过程通过碳碳双键和动态二硫键的协同反应,构建互穿拓扑网络。通过调节EugLp/LAx配比,可精准调控网络交联密度与动态键分布,从而优化材料性能。当LA添加量（质量分数）为30%时,材料的综合性能最佳（拉伸强度为2.3 MPa,断裂伸长率为61.6%）,打印特征尺寸低至22 μm。结论 该树脂不仅提升了可持续材料的综合力学性能,且适配高精度3D打印,为绿色精密包装及定制化结构件提供了高性能材料方案。
Abstract
To address the demand for customizable, high-performance bio-based materials in green packaging, the work aims to develop a bio-based photocurable resin combining high dynamic stiffness with steady-state flexibility for high-resolution DLP 3D printing of precision packaging structures. Eugenol lipoate (EugLp) was synthesized via esterification of DL-thioctic acid and eugenol, and then blended with LA monomer to construct the photocurable system. The effects of LA content on material properties were investigated through rheological, mechanical, and dynamic mechanical analyses, along with an assessment of 3D printability. The EugLp/LAx resin exhibited high bio-based content and low viscosity, forming an interpenetrating topological network through the synergistic reaction of carbon-carbon double bonds and dynamic disulfide bonds during photocuring. By adjusting the EugLp/LAx ratio, the crosslinking density and dynamic bond distribution were precisely controlled to optimize material performance. The resin with 30 wt% LA content achieved optimal properties, with a tensile strength of 2.3 MPa, elongation at break of 61.6%, and a printing feature size as fine as 22 μm. Overall, this resin enhances the mechanical performance of sustainable materials while enabling high-precision 3D printing, providing a promising material solution for green precision packaging and customized structural components.
关键词
生物基树脂 /
DL-硫辛酸 /
丁香酚 /
UV光固化 /
3D打印
Key words
bio-based resin /
DL-alpha-lipoic acid /
eugenol /
UV light curing /
3D printing
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基金
国家自然科学基金（61973127）; 广东省自然科学基金（2022A1515011416）; 中央高校基本科研业务费专项资金（2025ZYGXZR103）
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