三色碳点荧光防伪油墨的制备与性能研究  

Preparation and Printability of Tricolor Carbon Dots Fluorescent Anti-counterfeiting Ink

作　　者：邓炜杰 刘毅[2] 刘迪 周奕华[2] DENG Wei-jie;LIU Yi;LIU Di;ZHOU Yi-hua(Technical Center,Hubei Jinghua Color Printing Co.,Ltd.,Hubei Xiaogan,432800,China;Research Center of Graphic Communication,Printing and Packaging,Wuhan University,Wuhan 430079,China)

机构地区：[1]湖北京华彩印有限公司技术中心,湖北孝感432800 [2]武汉大学图像传播与印刷包装研究中心,武汉430079

出　　处：《包装工程》2022年第23期137-143,共7页Packaging Engineering

基　　金：国家新闻出版署“柔版印刷绿色制版与标准化”重点实验室招标课题资助(ZBKT202002)。

摘　　要：目的通过优化碳点合成方法和油墨配方,制备一种具有优良防伪效果和印刷适性的环保丝网印刷油墨。方法以邻苯二胺为碳源,水或乙醇为溶剂,采用溶剂(水)热法制备红色和黄色碳点。以柠檬酸钠和碳酸氢铵为碳源和氮源制备蓝色碳点,并对三色碳点的结构组成和光学性质进行表征和分析。以三色碳点作为荧光颜料,选择乙醇或水作为溶剂,水性环氧树脂或聚丙烯酸树脂作为连接料,通过实验获得最佳配比,制备三色荧光防伪油墨。结果三色碳点均具有较为均匀的尺寸,在365 nm紫外光激发下分别发射725 nm的红色荧光、450 nm的蓝色荧光和570 nm的黄色荧光,且rCDs、bCDs和yCDs的荧光量子产率分别为56.63%、64.37%和78.26%。通过对pH、细度、黏度等性能测试,该荧光防伪油墨各项印刷适性指标良好。结论通过优化碳点合成方法可控调节荧光发射光谱,制备出具有较宽的紫外吸收带、较窄的发射光谱带、荧光量子产率高的三色碳点。以此碳点作为荧光颜料可以制备出印刷适性良好的水性油墨,满足荧光防伪印刷的要求。The work aims to prepare a screen printing ink with excellent anti-counterfeiting effect,printability,and environmental protection by optimizing the synthesis method of carbon dots and the ink formulation.Firstly,with o-phenylenediamine as a carbon source and water and ethanol as solvents,red and yellow carbon dots were prepared by the solvent(hydro)thermal method.Blue carbon dots were prepared with sodium citrate and ammonium bicarbonate as carbon and nitrogen sources.The structural compositions and optical properties of the three carbon dots were characterized and analyzed.Then,tricolor fluorescent carbon dots were used as pigments,ethanol or water was selected as the solvent,and water-based epoxy resin and polyacrylic resin were used as binders to obtain the optimum proportion through test to prepare tricolor fluorescent anti-counterfeiting ink.Through the test,it was found that the tricolor carbon dots had relatively uniform sizes.Under the excitation of 365 nm ultraviolet light,they emitted red fluorescence at 725 nm,blue fluorescence at 450 nm and yellow fluorescence at 570 nm,and the fluorescence quantum yields of rCDs,bCDs and yCDs were 56.63%,64.37%,and 78.26%,respectively.By optimizing the synthesis method of carbon dots,the fluorescence emission spectrum can be controllably adjusted,and tricolor carbon dots with wide ultraviolet absorption band,narrow emission spectrum band and high fluorescence quantum yield can be prepared.This carbon dot can be used as fluorescent pigment to prepare water-based ink with good printability.It meets the requirements of fluorescent anti-counterfeiting printing.

关 键 词：碳点 荧光防伪油墨 印刷适性 丝网印刷 

分 类 号：TS84[轻工技术与工程]