Polyether end group functionalized super early strength type polycarboxylate superplasticizer and preparation method thereof

The invention discloses a polyether end group functionalized super-early-strength polycarboxylate superplasticizer and a preparation method thereof. The polyether end group functionalized super-early-strength polycarboxylate superplasticizer is prepared from HPEG, modified polyether LPEG, acrylic acid, acrylamide, an initiator, a reducing agent, a chain transfer agent, deionized water and caustic soda liquid through reaction. The preparation method comprises the following steps: preparing a modified polyether macromonomer (CA-HPEG) with terminal hydroxyl grafted carboxyl through alcoholysis of cyclic dianhydride, then carrying out amidation reaction with amino siloxane to prepare modified polyether LPEG with a long-chain branch end group having an amino and silyl cyclic structure, and introducing the prepared modified polyether LPEG and an amide monomer into a copolymerization reaction to prepare a long-side-chain, high-molecular-weight, high-molecular-weight and high-molecular-weight polyether copolymer. The