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在乙醇和水的混合体系中,以三聚氰胺和甲醛作为聚合单体,盐酸为催化剂,在无表面活性剂、模板的条件下,实现了粒径单分散的密胺树脂微球的合成。通过调节反应介质中醇的比例,并结合对反应温度、反应时间、酸催化剂的用量等反应条件的控制,可在0.5~5.2μm范围内精确调控微球的粒径。利用FT-IR、TG-DSC、SEM等手段对微球进行了表征,结果表明利用此方法得合成的微球粒径分布小于5%。该方法条件温和,操作简单,制备的微球粒径分布窄,且粒径可调,为后续制备不同粒径的功能化微球奠定了良好的基础。
In the mixed system of ethanol and water, the synthesis of melamine resin microspheres with monodispersed particle size was achieved by using melamine and formaldehyde as monomers and hydrochloric acid as catalyst in the absence of surfactant and template. By adjusting the proportion of alcohol in the reaction medium and controlling the reaction conditions such as reaction temperature, reaction time and amount of acid catalyst, the particle size of microspheres can be precisely controlled in the range of 0.5-5.2μm. The microspheres were characterized by FT-IR, TG-DSC and SEM. The results showed that the microspheres were less than 5% with this method. The method has the advantages of mild conditions, simple operation, narrow particle size distribution and adjustable particle size, which lays a good foundation for the subsequent preparation of functionalized microspheres with different particle sizes.