POLYCARBOXYLATE WATER REDUCER HAVING HIGH ADSORPTION AND MUD BLOCKING FUNCTIONS AND PREPARATION METHOD THEREFOR

A polycarboxylate water reducer having high absorption and mud-blocking functions and a preparation method therefor. The polycarboxylate water reducer comprises the following preparation raw materials: a modified polyether macromonomer, an unsaturated acid, a quaternary ammonium salt cationic monomer, a phosphate monomer, an unsaturated sulfonic acid group, an initiator, a chain transfer agent and a neutralizer. Said water reducer has good absorption and dispersion properties and mud blocking properties, can effectively enhance the adsorption capacity for cement particles, inhibit the influence of the mud content in gravel on adsorption and dispersion, and significantly improve the mud blocking capacity of the polycarboxylate water reducer, and thus helps to improve performance of concrete.