Mud-resistant polycarboxylate superplasticizer and preparation method thereof

The invention discloses a mud-resistant modified polycarboxylate superplasticizer which is characterized in that EPEG3000, maleic anhydride and a modified monomer are taken as monomers, and the mud-resistant modified polycarboxylate superplasticizer is prepared through polymerization reaction under the action of an initiator and a chain transfer agent, the preparation method of the modified monomer comprises the following steps: adding acrylic acid, ferrocenyl glycidyl ether, p-toluenesulfonic acid and hydroquinone into a reaction container, continuously introducing N2, carrying out a stirring reaction, and washing to remove unreacted substances so as to obtain an intermediate product; adding the intermediate product and triethylamine into n-octane, continuously introducing N2, dropwise adding bis (2, 6-dimethylphenyl) phosphoryl chloride while stirring, continuously stirring and reacting after dropwise adding, carrying out rotary evaporation to remove a solvent, and washing and drying the product to obtain a