Preparation Of Conductive Ink Based On PEDOT/CB In-situ Polymerization And Its Application In Packaging Anti-counterfeiting

Polythiophene and its derivatives have the advantages of high electrical conductivity,environmental friendliness and excellent thermal stability.The preparation of polythiophenes as high-polymer conductive inks has great application prospects in the fields of printed electronics and smart packaging.In this paper,poly(3,4-ethylenedioxythiophene)and conductive carbon black were used as the main research objects.Polythiophene/conductive carbon black conductive inks were prepared by two methods.The effects of different ratios and experimental conditions on the physical characterization properties and electrical conductivity of composites and inks were investigated.And through the screen printing technology in the field of anti-counterfeiting packaging for exploratory development and design.This paper provides a valuable reference for the theoretical study of high-polymer conductive inks and its application in packaging anti-counterfeiting.Firstly,polythiophene/conductive carbon black(PEDOT:PSS/CB)binary conductive ink was prepared by blending method.The effects of the types of binders,auxiliary additives and sintering temperature on the viscosity,adhesion and electrical conductivity of the ink were systematically studied.The results show that the prepared ink has good adhesion properties and meets the requirements of screen printing.When the ratio of PEDOT to sodium carboxymethylcellulose gel was 5:1 and the ratio to aqueous polyurethane was 5:3,the viscosity of the ink was 23.587 Pa·s.After thermal sintering at 60-100 °C,the resistance value of the conductive ink was significantly lowered,and the resistivity was 10.8 ?·cm at a sintering temperature of 80 °C.In addition,the ink resistance value can change regularly with the increase in the length and width of the print.Secondly,a polythiophene-conductive carbon black(PEDOT-CB)conductive composite was prepared by in-situ polymerization,and further prepared as a PEDOT-CB/CMC conductive ink.The morphology and structural characteristics of the composites were investigated,and the thermo-hardness analysis was used to study the thermal stability of the composites.The results show that carbon black limits the aggregation behavior of PEDOT without adding polystyrenesulfonic acid(PSS),and its processability and dispersibility are significantly improved.The porous and sponge-like structure of the composite increases the specific surface area,which helps to increase the energy storage density.In addition,the composite has higher electrical conductivity and thermal stability.When the ratio of CB to PEDOT is 5:5,the conductivity can reach 1.33 S/cm.In addition,the ink can meet the requirements of screen printing on different substrates such as paper,plastic and cotton.Finally,a conductive two-dimensional code based on variable twodimensional code technology was designed and developed using the prepared PEDOR-CB/CMC conductive ink.Combined with the variability and controllability of the ink resistance value and the anti-counterfeiting characteristics and interactive convenience of the two-dimensional code itself,the two-dimensional code realizes multiple anti-counterfeiting functions.The conductive two-dimensional code completely or does not affect the function of the current two-dimensional code.The conductive two-dimensional code can be applied not only in the field of variable twodimensional code,but also to the static two-dimensional code,which will make it more widely used in the field of packaging anti-counterfeiting,lower cost,and has a good market prospect.