Abstract:

In the modern personal care industry, the pursuit of “multiple benefits in one wash” has led to the incorporation of functional solid particles, such as microcapsules, into detergents. However, due to the density difference between the particles and the matrix, maintaining a uniform suspension of these particles poses a challenge, which can diminish their functional efficacy. To address this issue, this study utilized a composite binary rheological modification system comprising hydroxypropyl methylcellulose (HPMC) and TEMPO-oxidized bacterial cellulose microgels (T-BC-microgel) to stabilize the suspension of perfume oil microcapsules. This research systematically investigated the impact of varying concentrations of suspending agents on the stability of perfume oil microcapsules and bubbles in different matrices. The findings demonstrated that the HPMC/T-BC-microgel composite system significantly improved the suspension stability of perfume oil microcapsules and bubbles in both commercial laundry detergents and water. At a concentration of 0.048% suspending agent, the perfume oil microcapsules remained stably suspended for up to 240 days without altering the original rheological properties of the detergent. Additionally, the study uncovered an interaction between the suspending agents and surfactants that further enhanced the suspension effect. Based on these findings, this research offered a new pathway for developing efficient, stable and environmentally friendly suspension systems with potential industrial applications.

Key words: suspending rheology modifier, bacterial cellulose microgel, hydroxypropyl methylcellulose, rheological behavior, stable suspension

摘要：

在现代日化工业中，为实现“一洗多效”，越来越多以微胶囊为代表的功能性固体颗粒被添加进洗涤剂中，但是由于颗粒与基质之间的密度差，颗粒在洗涤剂中难以均匀悬浮分散，大大阻碍了固体颗粒功能性的发挥。因此，本研究以羟丙基甲基纤维素（HPMC）与TEMPO氧化细菌纤维素微凝胶（T-BC-microgel）构建了复合二元流变改性体系，来稳定悬浮香精油微胶囊。本研究系统研究了在不同的基质中不同浓度的悬浮剂对香精油微胶囊和气泡悬浮稳定性的影响。结果显示，HPMC/T-BC-microgel复合体系显著提高了香精油微胶囊和气泡在市售洗衣液和水中的悬浮稳定性，当悬浮剂质量分数为0.048%时，能够在不改变洗衣液原有流变特性的情况下，实现香精油微胶囊长达240天的稳定悬浮。另外，研究发现悬浮剂与表面活性剂也存在一定的相互作用增强了悬浮效果。基于此，本研究为开发高效、稳定、绿色悬浮体系提供了新的路径，具有一定的工业应用价值。

关键词: 悬浮流变改性剂, 细菌纤维素微凝胶, 羟丙基甲基纤维素, 流变行为, 稳定悬浮