PU包覆抗蚊蟲劑微膠囊之製備

本研究以香茅油作為芯材並以三異氰酸單體為殼物質，利用原位直接聚合法製作聚胺酯系微膠囊。藉由殼材與芯材添加比率的改變、組織均質機轉速的不同，分別探討最佳之聚合比例、微膠囊的釋放性和粒徑的大小。實驗結果顯示固定殼材在3.3g，芯材0.7g時，存在有最佳之香茅油包覆率。而粒徑隨著轉速的增加有變小的趨勢，轉速在200、500、1000及2000 rpm下，所得平均微膠囊粒徑分別為79.3±14.8、66.2±11.7、49.9±10.9和36.4±8.0µm。且轉速大者分佈範圍較為集中。PVA與微膠囊混和均勻塗覆於不織布時，經由制放測試，所得數據經直線回歸外插分析，估算制放極限時間可達391min，較無添加PVA之不織布樣本延遲4.5倍。

關鍵字

香茅油；微膠囊；原位直接聚合法；聚胺酯；制放效果

並列摘要

In this study, polyurethane microcapsules encapsulated citronella oil was prepared by an In-Situ polymerization. In order to examine the oil encapsulated efficiency, particle size and properties of controlled release of the polyurethane microcapsules. The parameters of the optimal ratio of core/wall and stirring speed were investigated. The results indicated that the optimal oil encapsulated efficiency was obtained at the ratio of 3.3g of wall membrane and 0.7g of core material. Increasing the stirring speed decreased the particle size. The particle size of polyurethane microcapsules were 79.6, 66.2, 49.9, 36.4µm at stirring speed of 200, 500, 1000, 2000rpm, respectively. The PVA aqueous solution was used as binder during the testing samples were dispersed on a rayon spunlaced nonvowen. It was founded that the added PVA treated samples appeared effect of the release up to 4.5 times than that without PVA treated samples.

並列關鍵字

Citronella oil ； microcapsules ； in-situ polymerization ； polyurethane ； controlled release

國際替代計量

PU包覆抗蚊蟲劑微膠囊之製備

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