We designed and synthesized epoxy-encapsulated microparticles with core–shell structures via suspension polymerization to enable high-efficiency, room-temperature cold spray processing. The soft core of the microparticles was comprised of a thermoset resin, diglycidyl ether of bisphenol A (DGEBA), which was optionally blended with the thermoplastic, poly(butyl acrylate); the protective shell was formed using polyurea. The composition, morphology, and thermal behavior of the microparticles were investigated. An inverse relationship between deposition efficiency and particle size was demonstrated by varying the surfactant concentration that was used during particle synthesis. We also determined that the microparticles that had pure resin as the core had the lowest viscosity, exhibited a decrease in the critical impact velocity required for adhesion, had the best flowability, and yielded a dramatic increase in deposition efficiency (56%). We have demonstrated that our in-house synthesized particles can form homogeneous, smooth, and fully coalesced coatings using room-temperature cold spray.

中文翻译：

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用于室温冷喷涂涂料的环氧树脂包封聚合物微粒

我们通过悬浮聚合设计并合成了具有核壳结构的环氧树脂封装的微粒，以实现高效的室温冷喷涂加工。微粒的软核由热固性树脂、双酚 A 的二缩水甘油醚 (DGEBA) 组成，它任选地与热塑性塑料聚（丙烯酸丁酯）混合；保护壳使用聚脲形成。研究了微粒的组成、形态和热行为。通过改变颗粒合成过程中使用的表面活性剂浓度，证明了沉积效率和颗粒尺寸之间的反比关系。我们还确定，以纯树脂为核心的微粒粘度最低，粘附所需的临界冲击速度降低，流动性最好，沉积效率显着提高（56%）。我们已经证明，我们的内部合成颗粒可以使用室温冷喷涂形成均匀、光滑和完全聚结的涂层。