The invention provides a
solid flaky polycarboxylate
superplasticizer and a method for preparing the same by a core-shell
emulsion method. The
superplasticizer comprises the following components in parts by weight: 18-32 parts of a special
methacrylate hydrophobic monomer for emulsification, 7-13 parts of a carboxylic
hydrophilic monomer for emulsification, 0.33-0.68 parts of an
emulsion initiator, 0.56-0.84 parts of a
chain transfer agent for emulsification, 37-62 parts of a carboxyl small
monomer, 53-76 parts of an unsaturated sulfonic small
monomer, 790-830 parts of a polyether
macromonomer, 4-9 parts of a weak
chain transfer agent, 3.6-6.8 parts of an azo initiator, 4.2-7.6 parts of an initiator, 2.3-4.2 parts of a strong
chain transfer agent, and 3.4-5.6 parts of a pH
regulator. The method comprises the following steps: (1) preparing an emulsifier; (2) preparing a nuclear
monomer emulsion; (3) preparing a shell monomer pre-emulsion; and (4) preparing the
solid flaky polycarboxylate
superplasticizer. The polycarboxylate superplasticizer prepared by the core-shell emulsion method has the advantages of single molecular weight, excellent performance, strong adaptability and easiness in storage, is prepared into
solid sheets, and is lower in
transportation cost and suitable for long-distance transportation.