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Polymer Particles with a Low Glass Transition Temperature Containing Thermoset Resin Enable Powder Coatings at Room Temperature

机译:包含热固性树脂的低玻璃化转变温度聚合物颗粒可在室温下形成粉末涂料

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摘要

Epoxy-based powder coatings are an attractive alternative to solvent-borne coatings. Here, in-house synthesized low glass transition temperature (Tg) particles containing epoxy resin and polymethyl methacrylate formed coatings at room temperature upon impact with a surface. Suspension polymerization was used to prepare particles as a function of diglycidyl ether of bisphenol A (DGEBA) and methyl methacrylate ratios. Higher incorporation of DGEBA decreased the Tg to below ~20°C and eliminated the need to heat the particles and/or aluminum substrates to form coatings. Using an electrostatic powder coating apparatus, a ~70% particle deposition efficiency was achieved on aluminum substrates heated to 200°C. Whereas, at room temperature, high-speed single particle impact experiments proved that particle bonding occurred at a critical velocity of 438 m/s, comparable to commercial cold spray technologies. The in-house synthesized particles used in this study hold potential in traditional and emerging additive manufacturing applications.
机译:环氧粉末涂料是溶剂型涂料的有吸引力的替代品。在此,包含环氧树脂和聚甲基丙烯酸甲酯的内部合成的低玻璃化转变温度(Tg)颗粒在室温下受到表面冲击后形成涂层。悬浮聚合用于制备作为双酚A的二缩水甘油醚(DGEBA)和甲基丙烯酸甲酯比例的函数的颗粒。较高的DGEBA掺入量可将Tg降至约20°C以下,并且无需加热颗粒和/或铝基材以形成涂层。使用静电粉末喷涂设备,在加热到200°C的铝基板上可获得约70%的颗粒沉积效率。而在室温下,高速单粒子撞击实验证明,粒子粘结以438 m / s的临界速度发生,可与商业冷喷涂技术相媲美。本研究中使用的内部合成颗粒在传统和新兴的增材制造应用中具有潜力。

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