Polymer and polymer emulsion, preparation method therefor, cement slurry, and application of polymer and polymer emulsion

A method for preparing a polymer emulsion comprising:

• (1) blending a mixed monomers, a emulsifier, and water to obtain a monomer emulsion;
• (2) irradiating the monomer emulsion to carry out a polymerization to obtain a polymer emulsion;
• wherein the mixed monomers comprise a monomer A, a monomer B, a cross-linker C, and a monomer D;
• wherein the monomer A is represented by CH2—CH2—R, wherein the group R is a C6-C23 alkyl;
• the monomer B comprises a benzene ring;
• the monomer D contains a hydrophilic structure;
• the monomer A, the monomer B, and the monomer D are used in such amounts that a molar ratio of the benzene ring, the hydrophilic structure, and the group R is (20-70):(1-10):(20-80);
• wherein a irradiation absorption dose is within a range of 10 kGy-50 kGy.