Polyacrylamide-based symmetric branched polymer surfactant and a process for preparing the same and use thereof

A polyacrylamide-based symmetric branched polymer surfactant, comprising an acrylamide structure unit, an anionic monomer structure unit, an optional non-ionic monomer structure unit, a branched structure unit, and an optional cationic monomer structure unit, wherein the branched structure unit has at least one of structures of formula (1) and formula (2):

• wherein, R1 is C1-C28 hydrocarbyl;
• R2 is selected from hydrogen atom, amino, carboxylic acid group, sulfonic acid group, sulfuric acid group, phosphoric acid group, mercapto, and halogen;
• R3 is hydrogen or methyl;
• R4 is —O—, —CH2—, —CH2OCH2— or —CH2O—;
• n is the number of Poly, Poly is independently at least one of
• a and b are each independently 0-40, and a and b are not 0 at the same time.