硫化镉-聚苯乙烯微球的简易合成及在紫外固化涂料中的应用

A Facile Method for Preparation of CdS/Polystyrene Composite Nanoparticles and Their Use in Ultraviolet Curable Coating

文中用烯丙基硫脲(AT)为功能辅助单体与苯乙烯聚合,并为Cd2+提供配位点,在Cd2+存在下,无皂乳液聚合制备了聚合物微球。由硫代乙酰胺(TAA)释放S2-,形成CdS,成功制备CdS/PS纳米复合微球。研究表明,控制乙酸镉(CdAc2)、偶氮二异丁基脒盐酸盐(AIBA)、TAA加料量可制得如球形、锥形、圆形的不同形貌复合粒子。再用环氧丙烯酸树脂为成膜物,将所制复合微球添到涂料基料中,制备了紫外光固化有机/无机纳米杂化荧光涂膜,其具有良好荧光性,最佳实验配方下光固化时间为10 s,固化涂膜铅笔硬度为5 H,耐冲击强度达到50 kg·cm,可耐受碱、酸及水的浸泡72 h以上。

A simple and facile method was developed for the preparation of monodispersed cadmium/polystyrene(PS) nanoparticles. Used as auxiliary monomer,allyl thiourea(AT) can coordinate to Cd2 +ions and co-polymerize with the main monomer styrene(St). Via surfactant-free emulsion polymerization,Cd2 +ions decorated polystyrene nanoparticles were obtained. After the addition of the thioacetamide(TAA),with the release of S2-from TAA,cadmium sulfide(CdS) was formed. Accordingly,CdS/PS nano-composite particles were prepared eventually. It is found that the order of the chemical addition and amount of the chemicals of cadmium diacetate(CdAc2),2,2'-azobis[2-methylpropionamidine]dihydrochloride(AIBA) and TAA plays an important role for the morphology of the composite particles. Epoxy acrylate resin was chosen as film-forming material,the composite microspheres were added into the coating. Organic/inorganic hybrid fluorescent coating was prepared by UV-curable. Fluorescence was used to characterize the coating with well fluorescence properties. Under the optional recipe,the photo-curing time is 10 s,the pencil hardness is 5 H, the impact strength reaches 50 kg·cm,and the endurance time to acidic and basic solutions rises up to 72 h.