The invention belongs to the technical field of preparation of a microcapsule, and relates to a latent self-repair microcapsule for an organic
coating and a preparation method of the latent self-repair microcapsule. The method comprises the steps of feeding
urea and
formaldehyde mixed solution into a four-mouth flask, adjusting the pH value to 7.5-11.8 with
triethanolamine, and ensuring that the temperature is slowly increased for reaction for 3 hours, so as to produce viscous transparent water-soluble
urea-
formaldehyde prepolymer solution; sufficiently mixing a
capsule-core
epoxy resin, a
capsule-core diluting agent, and a
capsule-core latent curing modifier proportionally, adding
distilled water, stirring, adding an emulsifying agent, emulsifying for 10-20min in a high-speed emulsifyingmachine, so as to form O / W type
emulsion, mixing the
urea-
formaldehyde prepolymer solution and the emulsified liquid and sufficiently stirring to disperse in an
aqueous medium, adjusting the pH valueto 1.0 to 5.0, centrifugating the
particle suspension after curing at a controlled temperature for 3 hours, performing flushing for a plurality of times, and then performing
vacuum drying to obtain the microcapsule. The method has the advantages that the technology is simple, the condition is easy to control, the preparation cost is low, the product quality is good, the repair effect is good, themanpower and cost are saved, and the method is environment-friendly.