季铵化壳聚糖包覆腐殖酸微胶囊的制备与性能研究

Preparation and Water Retention Property of quaternized chitosan Coated Humic Acid Microcapsule

摘要:

以季铵化壳聚糖（QCTS）为壁材、腐殖酸(HA)为芯材，制备季铵化壳聚糖包覆腐殖酸(QCTS/HA)微胶囊。采用傅里叶红外光谱(FTIR)、偏光显微镜(POM)、扫描电子显微镜(SEM)对微胶囊的性能进行表征。以芯壁比〔m(HA):m(QCTS)〕、固化剂用量和搅拌速度作为单因素，探讨了微胶囊的最佳制备条件。并且对最佳制备条件下的微胶囊进行了形貌观测以及吸水和保水性能测试。结果表明，QCTS/HA微胶囊的最佳工艺参数为：m(HA):m(QCTS)=3:1，固化剂用量为总质量的1%，搅拌速度为500r/min；与相同条件下未改性的微胶囊CTS/HA相比，改性后的QCTS/HA微胶囊包覆层表面孔隙结构比较完善，分布均匀，孔洞较多，具有更加优异的吸水和保水性能，其12h的吸水率和保水率分别高达348%和208%。 关键词：季铵化壳聚糖；腐殖酸；核壳结构；微胶囊；吸水性能，保水性能

Abstract:

Quaternized chitosan coated humic acid (QCTS/HA) microcapsules as a new kind of water retention materials were prepared using quaternized chitosan (QCTS) as wall materials and humic acid (HA) as the cores. The performances of the microcapsules were characterized by Fourier transform infrared (FTIR) spectroscopy, polarizing microscope (POM) and scanning electron microscope (SEM),respectively. This paper explores the optimum conditions of QCTS/HA microcapsules by three factors: the core-wall ratio [m(HA): m (QCTS)], curing agent content and stirring rate. Micro-structures of microcapsule products prepared under optimal conditions were observed, and the water-absorption and water-retention properties of the product was tested. The results showed that QCTS/HA microcapsule had the best performance when the ration of m(HA) to m(QCTS) was 3:1, combined by 1% curing agent of the total mass for QCTS/HA microcapsule and a stirring rate of 500 r/min. Compared with CTS / HA microcapsules under the same conditions, the pore structure on the surface of QCTS / HA microcapsules is relatively perfect and well-distributed, and the quantity of pores are quite great . In addition, the microcapsule has better water absorption and water retention performance with water absorption rate and water retention rate as high as 348% and 208% in 12 h, respectively.