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首页> 外文期刊>Journal of Encapsulation and Adsorption Sciences >Preparation of Thermosensitive Microcapsules Containing Water Soluble Powder by Melting Dispersion Cooling Method
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Preparation of Thermosensitive Microcapsules Containing Water Soluble Powder by Melting Dispersion Cooling Method

机译：熔融分散冷却法制备水溶性粉末热敏微胶囊

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摘要

It was tried to prepare the thermosensitive microcapsules containing the water soluble solid powder by the melting dispersion cooling method and to establish the optimum preparation conditions. As a model water soluble solid powder, sodium hydrogen carbonate was adopted in order to generate carbon dioxide gas and as a thermosensitive shell material, olefin resin with the melting point of ca. 40°C was used. In the experiment, the concentration of olefin resin in the shell material solution was mainly changed together with the concentrations of the oil soluble surfactant species and the α-tocopherol as a modifier of shell. Addition of α-tocopherol into the shell material solution could prevent the core from breaking away during the microencapsulation process and result in the higher microencapsulation efficiency, because the dispersion stability of solid powder in the shell material solution could be increased due to the increase in affinity between the shell material solution and solid powder. Also, the microencapsulation efficiency increased with the concentration of olefin resin, became maximum at 50 wt% and then, decreased. The microcapsules were found to begin melting at 36°C and to generate carbon dioxide gas.
机译：尝试通过熔融分散冷却法制备包含水溶性固体粉末的热敏微胶囊，并建立最佳制备条件。作为典型的水溶性固体粉末，采用碳酸氢钠以产生二氧化碳气体，并采用熔点为约2℃的烯烃树脂作为热敏壳材料。使用40℃。在实验中，主要改变壳材料溶液中烯烃树脂的浓度以及油溶性表面活性剂种类和作为壳改性剂的α-生育酚的浓度。在壳材料溶液中添加α-生育酚可以防止微囊化过程中核的破裂，并导致更高的微囊化效率，因为可以通过增加亲和力来提高固体粉末在壳材料溶液中的分散稳定性在外壳材料溶液和固体粉末之间。而且，微胶囊化效率随着烯烃树脂的浓度而增加，在50wt％时达到最大，然后降低。发现微胶囊在36℃开始熔化并产生二氧化碳气体。

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