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首页> 外文期刊>Journal of Microencapsulation: Microcapsules Liposomes Nanoparticles Microcells Microspheres >Encapsulation of a pressure-sensitive adhesive by spray-drying: microparticles preparation and evaluation of their crushing strength
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Encapsulation of a pressure-sensitive adhesive by spray-drying: microparticles preparation and evaluation of their crushing strength

机译：通过喷雾干燥包封压敏粘合剂：微粒的制备及其抗碎强度的评估

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摘要

An industrial pressure-sensitive adhesive was microencapsulated by spray-drying using an aqueous colloidal ethylcellulose dispersion (Aquacoat~R ECD) plasticised by triacetin to form the wall material. Unloaded (0:100) and adhesive-loaded (25:75) particles were produced in a Biichi B-191 mini spray-dryer with product yields of 62% and 57%, respectively. Microparticles were spherical and narrow sized with mean D_(3,2) diameters of 3.165 ± 0.001 and 5.544 ± 0.105 μm, respectively. The microparticles were found to redisperse well in water and exhibit enough stability in neutral and alkaline aqueous media to be further used in a coating slip. Crush tests on single microparticles with diameters ranging from 2 to 12 μm were performed using a nanoindenter. They revealed that the crushing force of both kinds of microparticles increased linearly with their diameter and that the adhesive loading reduced the mechanical strength of the prepared microparticles.
机译：使用三醋精增塑的胶态乙基纤维素水分散体（Aquacoat®R ECD）通过喷雾干燥将工业压敏胶微囊化以形成壁材。在Biichi B-191小型喷雾干燥机中生产了未负载（0：100）和粘合剂负载（25:75）的颗粒，产品收率分别为62％和57％。微粒为球形，尺寸狭窄，平均D_（3,2）直径分别为3.165±0.001和5.544±0.105μm。发现该微粒很好地重新分散在水中，并在中性和碱性水性介质中显示出足够的稳定性，可进一步用于涂料中。使用纳米压头对直径范围为2至12μm的单个微粒进行压碎测试。他们发现，两种微粒的压碎力均随直径的增加而线性增加，而胶粘剂的加入降低了所制备微粒的机械强度。

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