The invention discloses a core-shell pure acrylic
emulsion for an exterior wall
coating as well as a preparation method and application thereof, and belongs to the technical field of building coatings. The core-shell pure acrylic
emulsion comprises the following components in parts by
mass: 5.07-30 parts of a core
monomer, 5.07-30 parts of a shell
monomer, 0.6-12 parts of a reactive emulsifier, 0.02-2 parts of a nonionic emulsifier, 0.02-5 parts of an initiator, 0.02-2 parts of a defoaming agent, 0.02-2 parts of a
preservative, 0.02-5 parts of a pH neutralizing agent and 45-60 parts of deionized water. The core
monomer is a main monomer; the shell monomer comprises 4.93-20 parts of a main monomer, 1-10 parts of a hydrophobic soft monomer, 0.02-2.55 parts of a polar monomer, 0.01-1.25 partsof a
room temperature self-crosslinking monomer component A, 0.01-1.25 parts of a
room temperature self-crosslinking monomer component B, and 0.02-2.5 parts of a
photoinitiator crosslinking agent, wherein the main monomer comprises an acrylic soft monomer and an acrylic hard monomer; and the
mass ratio of the
room temperature self-crosslinking monomer component A to the room temperature self-crosslinking monomer component B is 2:1. The
emulsion provided by the invention has balanced performance on the whole, and improves the comprehensive performance such as film compactness,
adhesive force,
water resistance, and raindrop imprint resistance on the basis of fully ensuring film formation.