Nano modified cation dispersed rosin size compound and preparation method thereof

The invention provides a nano modified cationic dispersed rosin size compound which comprises the following components in parts by weight: 70-75 parts of rosin, 10-20 parts of gelatin, 5-10 parts of modified bletilla striata gum, 5-10 parts of multiwalled carbon nanotubes, 15-20 parts of quaternary ammonium cationic starch, 5-10 parts of a co-emulsifier and 5-10 parts of a stabilizer, and the cationic emulsifier is a quaternary ammonium cationic starch aqueous emulsion. The preparation method comprises the following steps: fully melting the rosin, the gelatin and the modified bletilla striata gum in a closed reaction container, preheating a mixed aqueous solution of the multi-walled carbon nanotubes, the cationic emulsifier, the co-emulsifier and the stabilizer to 90-98 DEG C, adding the preheated mixed aqueous solution into the molten mixture, stirring at a low speed, shearing at a high speed, discharging, and passing through a homogenizer. According to the invention, gelatin and modified bletilla striata gu