Experimental study on matching ratio of slurry for silkscreen printing graphene heating film
To investigate the impact of carbon black and DBE on the printability of graphene inks and the electrical conductivity of thermal film,and to determine the optimal ratio that enhances electrical conductivity while maintaining good printability,multiple groups of graphene electric heating inks were prepared using a single-factor method by varying amounts of carbon black and DBE to graphene raw slurry.Subsequently,graphene heating films were printed.Through viscosity testing at different temperatures or shear rates,square resistance measurement of the heating film,and SEM imaging analysis,the best ratio for graphene electric heating ink was explored.Results show that as carbon black content increases,ink viscosity also increases;meanwhile,square resistance initially decrea-ses but then increases again.The lowest square resistance is obtained at a carbon black content of 0.9%.On the other hand,with in-creasing DBE content,ink viscosity decreases gradually while square resistance increases.Notably,an ink formulation containing 8%DBE and 1.8%carbon black exhibites excellent printability performance.Furthermore,when printing with a 100 mesh screen compared to direct use of original paste,this formulation resulted in a significant reduction(50.4%)in square resistance for the printed heating film.Simultaneous addition of carbon black and DBE proves to be an effective approach for maintaining printability while reducing ther-mal film resistance.
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