Preparation method of naphthalene-based efficient water reducing agent

The invention relates to the field of water reducing agents, and discloses a preparation method of a naphthalene-based efficient water reducing agent, wherein the naphthalene-based efficient water reducing agent is prepared by using wash oil, concentrated sulfuric acid, formaldehyde, sodium lignin sulfonate and other raw materials. According to the invention, in a sulfonation reaction process, washing oil is added to replace part of industrial naphthalene, so that the sulfonation reaction time is shortened, and the production efficiency is improved; in a neutralization reaction process, a sodium lignin sulfonate solution is added, so that sodium lignin sulfonate fully participates in the neutralization reaction so as to increase the yield of the finished product and save the production cost; and the method solves the problems of long time consumption, low production efficiency and high production cost in the existing naphthalene-based efficient water reducing agent production and preparation process. 本发明涉及减水剂