摘要：以壳聚糖和三聚磷酸钠为壁材驱蚊剂—e为芯材，通过离子凝聚法来制备合成驱蚊微胶囊。采用生物显微镜、红外光谱等测试技术对所制备的微胶囊的形貌特征、粒径大小、结构组成进行了分析与表征。本文主要研究了壳聚糖和三聚磷酸钠成囊的最优比例，正常情况下的芯壁比，并讨论了pH值，温度，不同分子量的壁材对包埋率和包埋效率的影响。结果表明：CS-HAC与TPP的比例1：1时，CS-HAC和TPP充分成膜。随着pH值的不断减小，体系酸性增大，包埋率和包埋效率也随着缓慢增大，当pH等于5时，达到最优，之后在减小pH值，包埋率和包埋效率随之下降；改变体系温度时，当T达到50℃时，包埋率和包埋效率达到最优；而当将壳聚糖换成壳寡糖时，分子量减小，与三聚磷酸钠复合，大大提高了合成驱蚊微胶囊的包埋效率。34774
毕业论文关键字：合成驱蚊剂；微胶囊；离子凝聚法；表征
Preparation and characterization of synthetic repellent microcapsules
Abstract ：With chitosan and sodium tripolyphosphate as wall and mosquito repellent -e as core material, synthetic repellent microcapsules prepared by ion aggregation method. The use of biological microscopes, infrared spectrum testing technology for topographical features microcapsules prepared, particle size, structure and composition were analyzed and characterized. This paper studies the optimal ratio of chitosan and sodium tripolyphosphate into a capsule, the proportion of core and wall under normal circumstances, and the influence of PH value, temperature, different molecular weight of the wall material for embedding rate and encapsulation efficiency. The results showed that: the ratio of chitosan and tripolyphosphate into 1:1, chitosan and sodium tripolyphosphate full film. With decreasing PH value, the system acidity increases, embedded and embedding efficiency with the slow increasing, when the PH is equal to 5, optimal, after reducing the PH value, embedding rate and packet buried efficiency fall. When changing the temperature of the system, when the temperature reached 50 ℃, encapsulation efficiency and embedding rate is optimal. And when the shells into chitosan oligosaccharide, molecular weight decreases, and sodium tripolyphosphate compound, greatly improving the embedded efficiency of the synthetic of insect microcapsules.
Keywords: Synthesis of insect repellent; microcapsule; ion coacervation; characterization
目录
1、绪论 1
1.1 微胶囊及微胶囊制备技术 1
1.1.1微胶囊的概述 1
1.1.2微胶囊壁材的选择 1
1.1.3微胶囊的制备方法及研究现状与趋势 3
1.2驱蚊剂 3
1.2.1驱蚊剂的概述 3
1.2.2驱蚊剂的选择 4
1.2.3驱蚊剂的研究现状 4
1.3合成驱蚊微胶囊 5
1.3.1合成驱蚊微胶囊的特点 5
1.3.2合成驱蚊微胶囊的制备 5
1.3.3合成驱蚊微胶囊的研究现状 6
2、实验原理和方法 7
2.1实验原料及仪器 7
2.1.1实验原料 7
2.1.2实验仪器 7
2.2实验原理 8
2.2.1壳聚糖和三聚磷酸钠反应原理 8
2.2.2实验工艺流程 8
2.2.3壳寡糖和三聚磷酸钠反应原理 9
2.2.4实验工艺流程 10
2.3实验方法 10
2.3.1壳聚糖溶于冰醋酸发生质子化反应 11
2.3.2微胶囊化 11
2.3.3固化 11
3、实验设计 12
3.1实验内容 12 合成驱蚊微胶囊的制备与表征:http://www.751com.cn/huaxue/lunwen_32416.html