目的 针对传统UV填补胶固化速度慢,颜色单一的问题,制备一种快速固化的彩色UV填补胶,并探究色母浓度对其色彩特性的影响规律。方法 以聚氨酯丙烯酸酯和环氧丙烯酸酯为混杂基体,构建紫外光固化体系;系统研究纳米二氧化钛（TiO2）、羧甲基纳米纤维素钠（CMC-Na）及四色色母对材料光固化动力学、力学性能、热稳定性及CIELAB色彩参数的影响规律。结果 实验表明,体系的最佳树脂质量比（无影胶∶光敏树脂）为2∶8,光引发剂2959的最佳添加量为1%。纳米TiO2在低质量分数（0.5%~1%）下表现出显著的“光散射增效”,将固化时间缩短至2 s;而高浓度下则因“内滤光效应”导致固化迟滞。CMC-Na通过构建界面氢键网络显著提升了材料韧性,当添加质量分数为2%时,断裂伸长率提升至33.2%。色母的引入因与光引发剂产生竞争吸收而延长固化时间,迟滞程度呈蓝>绿>黄>红的规律。结论 该改性UV填补胶体系成功平衡了固化效率与物理性能的矛盾,实现了色彩的数字化线性调控,为高档包装产品的外观无痕修复提供了理论依据与工程方案。
Abstract
The work aims to develop a rapid-curing UV filling adhesive and investigate the effect of color masterbatch concentration on its color properties, so as to address the issues of slow curing speed and limited color options in traditional UV filling adhesives. A hybrid ultraviolet (UV) curing system was constructed with polyurethane acrylate and epoxy acrylate as the matrix. The effects of nano-titanium dioxide (TiO2), sodium carboxymethyl cellulose (CMC-Na), and four color masterbatches on the photopolymerization kinetics, mechanical properties, thermal stability, and CIELAB color parameters of the material were systematically investigated. Experimental results indicated that the optimal resin mass ratio for the system was 2:8 (shadow glue:photosensitive resin), with an optimal photoinitiator 2959 loading of 1%. Nano-TiO2 exhibited a significant "light scattering enhancement effect" at low concentrations (0.5%-1%), reducing the curing time to 2 s, while higher concentrations led to curing retardation due to the "inner filter effect". CMC-Na significantly improved material toughness by forming an interfacial hydrogen-bonding network, increasing the elongation at break to 33.2% at a loading of 2 wt%. The incorporation of color masterbatches prolonged the curing time due to competitive absorption with the photoinitiator, with the retardation degree following the order: blue > green > yellow > red. The modified UV filling adhesive system successfully balances the conflict between curing efficiency and physical properties, achieves digital linear regulation of color, and provides a theoretical foundation and engineering solution for the seamless aesthetic repair of high-end packaging products.
关键词
光固化动力学 /
UV填补胶 /
色彩特性 /
纳米二氧化钛 /
羧甲基纳米纤维素钠
Key words
photopolymerization kinetics /
UV filling adhesive /
color properties /
nano-titanium dioxide /
sodium carboxymethyl cellulose (CMC-Na)
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基金
广西重点研发计划（2025FNFN96086）;广西自然科学基金项目（2025GXNSFAA069614）
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