热膨胀微胶囊的表面功能化及印刷应用

Surface Functionalization and Printing Application of Thermally Expandable Microcapsules

热膨胀微胶囊(Thermally expandable microcapsules,TEMs)具有受热体积增大的特点,由于其壁材表面通常为绝缘性的热塑性树脂,难以满足导电、导热、磁性、阻燃等多功能化的需求。因此,通过对微胶囊的表面进行结构改性以满足不同领域的应用具有非常重要的意义。本研究采用聚苯胺(PANI)和离子液体-氧化石墨烯(ILs-GO)杂化复合材料对TEMs的表面进行结构修饰,在微胶囊的壁材表面附着多层改性功能层,并将其应用于发泡油墨和印刷产品。重点研究了苯胺单体与ILs-GO在微胶囊表面的聚合机制,证实离子液体可成功负载到氧化石墨烯体系,分析了复合功能层在微胶囊表面的包覆过程。最后,将功能化的微胶囊进行配方设计得到发泡油墨,利用丝网印刷工艺将油墨转移至不同的柔性基材上得到兼具三维效果和多功能特性的印刷产品。

Thermally expandable microcapsules(TEMs)have the characteristic of increasing their volume under a certain heating temperature.It is difficult to meet the multi-functional requirements of electrical conductivity,thermal conductivity,magnetism and flame retardancy because the surface of the wall material is usually insulating thermoplastic resin.Therefore,it is of great significance to modify the surface of microcapsules to meet the application in different fields.In this study,polyaniline(PANI)and ionic liquid-graphene oxide(ILs-GO)hybrid composite materials were used to structurally modify the surface of TEMs.Meanwhile,multiple modified functional layers were attached to the surface of the microcapsule wall materials,which were applied to foaming inks and printing products.The focus was on the polymerization mechanism of aniline monomer and ILs-GO on the surface of the microcapsules.Moreover,it was confirmed that the ionic liquid was successfully loaded into the graphene oxide system and the coating process of the composite functional layer was carried out on the surface of the microcapsules.Finally,the functionalized microcapsules were formulated to obtain foaming inks,and the screen-printing process was used to transfer the inks to different flexible substrates to obtain the printed products with both three-dimensional effects and multifunctions.