Thickened oil viscosity reducer and preparation method thereof

The invention belongs to the technical field of oil exploitation, and particularly relates to a thick oil viscosity reducer and a synthesis method thereof. The preparation method comprises the following steps: sequentially adding 2, 6-bis (dodecyloxy) benzaldehyde, 2-aminoethanesulfonic acid, a formic acid aqueous solution with a concentration of 30 wt% and deionized water into a four-neck flask equipped with a condenser tube, carrying out heating reflux, cooling to a temperature below 40 DEG C, transferring a reaction solution into a rotary evaporator, and carrying out reduced pressure distillation to obtain a brown yellow oily substance; transferring the oily matter into a four-neck flask by using 95 wt% ethanol, adjusting the pH to 9-10 by using a 2mol/L sodium hydroxide solution, adding sodium chloroethanesulfonate, performing heating reflux, maintaining the pH to 9-10 by using 2mol/L sodium hydroxide during the reaction, and performing reduced pressure distillation to obtain a viscous brown solid; and re