湿敏型二氧化氯缓释剂的制备和表征

Preparation and Characterization of Moisture Sensitive Chlorine Dioxide Slow-releasing Preservative

目的研发一种高稳定性、长时间杀菌的缓释型固态二氧化氯保鲜剂,解决现有二氧化氯缓释剂存在的释放波动大、使用困难等问题。方法以具有缓释底物功能的聚氨酯为基材,以亚氯酸钠为主要材料,采用单因素试验结合正交实验制备一种湿敏性二氧化氯缓释剂。通过测定基材酸值确定活化剂DMPA的最佳用量,探究亚氯酸钠添加量、粒径和相对湿度对缓释剂缓释性能的影响,观测缓释剂的表面形貌和内部结构。结果在相对湿度为50%、亚氯酸钠添加量为1.5 g、粒径在250~300目时,二氧化氯缓释剂释放总量高且释放波动平缓,不会出现暴释现象。结论制备的一种缓释型固态二氧化氯保鲜剂能实现对二氧化氯的长效缓释。

The work aims to create a slow-releasing solid chlorine dioxide preservative with high stability and a long effective sterilization period,to solve the issues in the existing chlorine dioxide slow-releasing preservative,such as substantial release fluctuations and difficulty in usage.With polyurethane serving as the slow-releasing substrate as the base material and sodium chlorite as the main material,a moisture-sensitive chlorine dioxide slow-releasing preservative was created by a one-way test combined with an orthogonal experiment.The optimal dosage of activator DMPA was found by evaluating the acid value of the substrate.The effects of sodium chlorite addition,particle size,and relative humidity on the release capability of the preservative were studied,and its surface morphology and interior structure were observed.At 50%of relative humidity,1.5 g of sodium chlorite,and 250-300 of mesh particle size,the total amount of chlorine dioxide released was high,and the release fluctuated smoothly.There was no violent release phenomenon.In this study,a slow-releasing solid chlorine dioxide preservative has been developed to achieve long-term slow release of chlorine dioxide.