Phosphorylated polycondensate as high efficiency water reducing agent and preparation method thereof

A phosphorylated polycondensate high-performance water-reducing agent, having a molecular structure represented by the following formula I:

• wherein the molecular structure of the polymer comprises three building blocks A, B, and C, formed by condensation of the corresponding monomers phosphorylated melamine A, an aldehyde B and an aryl alkoxy compound C, and the molecular structure is a comb-like structure;
• the three monomers has a mole ratio of m:n:p=1.5 to 4.5:1.8 to 3.2:1;
• the monomer A is phosphorylated melamine having a structure selected from the following monodentate structure II and bidentate structure III;
• the monomer B is one of formaldehyde, acetaldehyde and benzaldehyde compounds, or a mixture thereof in any ratio;
• the monomer C is either a phenoxypolyoxyalkylene ether ora phenylaminopolyoxyalkylene ether, and monomer C has a molecular weight (Mw) of 1000 to 6000, wherein R4 and R5 are H, OH, NH2 or polyether side chain moieties of the phenoxypolyoxyalkylene ether or phenylaminopolyoxyalkylene ether, provided that R4 and R5 cannot both be H, OH or NH2;
• and
• the phosphorylated polycondensate high-performance water-reducing agent has a weight average molecular weight of 10000 to 50000.