Fluorescent polycarboxylate superplasticizer and preparation method thereof

A preparation method of a fluorescent polycarboxylate superplasticizer, comprising the following steps:

• 1) performing a redox radical polymerization reaction on a monomer of an unsaturated acid and a derivative of the unsaturated acid, and an unsaturated polyether monomer at a temperature of 5-45° C. for 3-5 hours under a combined action of an initiator, a reducing agent and a chain transfer agent to obtain a polycarboxylate superplasticizer pre-product;
• wherein, a molar ratio of the unsaturated polyether monomer, the monomer of the unsaturated acid and the derivative of the unsaturated acid, the initiator, the reducing agent and the chain transfer agent is 1:(2-6):(0.01-0.1):(0.02-0.2):(0.03-0.1);
• and
• 2) performing an esterification reaction on the polycarboxylate superplasticizer pre-product and an organic molecule having a fluorescent property under an action of a catalyst for 3-5 hours, then adjusting a pH to 6-7 with an alkali solution, and adding water to obtain the fluorescent polycarboxylate superplasticizer with a concentration of 5%-60% by weight;
• wherein, a molar ratio of the polycarboxylate superplasticizer pre-product, the organic molecule having the fluorescent property, and the catalyst is 1:(1-10):(0.01-0.1).