含有桑葚花青素和纳米二氧化钛的壳聚糖/羟乙基纤维素双层膜的3D打印制备及研究

Chitosan/Hydroxyethyl Cellulose Containing Mulberry Anthocyanin and Nano Titanium Dioxide Preparation and Research of Two-layer Film by 3D Printing

以壳聚糖(CS)和羟乙基纤维素(HEC)作为制膜基材制备了一种双层抗菌显色材料。向基材中分别添加纳米二氧化钛(Nano-TiO_(2))和桑葚花青素作为天然指示剂、抑菌剂,分别形成外层及内层材料,各层材料内部通过分子间相互作用力进行结合,呈现出较为致密的微观结构。通过实验探究该复合材料的基础性能及3D打印参数的优化。结果表明,基材的最佳质量比为CS∶HEC=3∶3,CH黏度适中。通过打印参数优化,逐步确定CH的最佳打印参数如喷嘴直径、打印压强、喷嘴高度及打印速率,打印图像清晰,较稳定,不易塌陷及扩散。内层膜填充密度会对材料整体性能产生影响,其中内层膜填充密度为45%时(CHMT-45%),材料性能最佳,在不同温度下,均表现出较强的颜色稳定性。

A double-layer antibacterial color rendering material using chitosan(CS)and hydroxyethyl cellulose(HEC)as membrane substrates was prepared.Taking nano-TiO_(2) and mulberry anthocyanin as natural indicator and bacteriostatic agent were added to the substrate to form the outer and inner layer materials,and the inner layer materials were combined through the intermolecular interaction force,presenting a relatively dense microstructure.The basic properties of the composite and the optimization of three dimensional(3D)printing parameters were explored through experiments.The results show that the optimal ratio of substrate is CS∶HEC=3∶3(CH),and the viscosity of CH is moderate.Through the optimization of printing parameters,the optimal printing parameters,such as,nozzle diameter,printing pressure,nozzle height and printing rate are gradually determined.The printed image is clear,stable and not easy to collapse and diffusion.The filling rate of the inner film has an impact on the overall performance of the material.When the filling rate of the inner film is 45%(CHMT-45%),the material has the best performance and shows strong color stability at different temperatures.