▎ 摘　　要

NOVELTY - Star-type sulfonic acid zwitterionic compound is represented by (I). USE - Star-type sulfonic acid zwitterionic compound as graphene dispersant (claimed). DETAILED DESCRIPTION - Star-type sulfonic acid zwitterionic compound is represented by formula (I). R1=CH3 or CH2CH3. An INDEPENDENT CLAIM is included for a method for producing star-type sulfonic acid zwitterionic compound, which involves: (A) adding trimethylolpropane-three to a methylamine or ethylamine aqueous solution, and 3-aziridine propionate reaction solution in presence of an acidic catalyst for aziridine ring-opening reaction, reacting at 40-70 degrees C for 5-7 hours under weakly basic conditions; (B) adding 2-chloroethyl to the above reaction until sodium sulfonate aqueous solution is subjected to sulfonic acid group substitution and quaternization reaction, and reacting at 70-90 degrees C for 10-14 hours; (C) removing insoluble matter, concentrating reaction liquid, and purifying product by using toluene column chromatography; and (D) drying under vacuum to obatin desired product.