The invention discloses a
coating thickening water-retaining agent, which is prepared from the following raw materials in parts by weight: 0.05 to 10 parts of an anionic emulsifier, 0.05 to 20 parts of a nonionic emulsifier, 0.5 to 200 parts of a reaction
monomer, 0.1 to 40 parts of a
functional monomer, 0.1 to 30 parts of a modified
monomer, 0.01 to 10 parts of a
buffering agent, 0.005 to 10 parts of an initiator, 0.005 to 20 parts of an oxidant and a proper amount of water. The
functional monomer comprises at least one of hydroxyethyl
acrylate, hydroxypropyl
acrylate, hydroxyethyl methylacrylate and
hydroxypropyl methacrylate. The
coating thickening water-retaining agent prepared by the invention has the characteristic of small dosage, is good in thickening effect, excellent in
water retention performance and excellent in
shear thinning capability, and is very suitable for high-
solid-content coatings; and the prepared
coating thickening water-retaining agent is
environmentally friendly and free of peculiar smell, residual monomers are removed through some post-treatment processes, the residual monomers are greatly reduced, and therefore the prepared product is
environmentally friendly and free of peculiar smell and does not contain APEO substances.