The invention belongs to the field of coatings, and particularly relates to composite waterborne
alkyd resin with high storage stability. The composite waterborne
alkyd resin is prepared according to the following method: adding
vegetable oil and polyols into a reaction vessel under the protection of
nitrogen, raising the temperature to 118 to 122 DEG C, adding an alcoholysis catalyst, raising the temperature to 240 to 245 DEG C, preserving heat to an alcoholysis endpoint, reducing the temperature to 165 to 180 DEG C, adding an acrylic
prepolymer, raising the temperature to 220 to 225 DEG C, preserving heat for esterification until the
acid value is equal to or lower than 5, reducing the temperature to 145 to 160 DEG C, adding polyacid, a
sulfonate prepolymer, a water-carrying agent and an esterification catalyst, raising the temperature to 220 to 225 DEG C, preserving heat for esterification until the
acid value is lower than 15, adding modified attapulgite, preserving heat to continue reaction for 2 to 3h, reducing the temperature to 150 to 160 DEG C, performing reduced pressure vacuumizing to remove the water-carrying agent, reducing the temperature to 110 to 115 DEG C, adding 15 to 20 parts of a co-
solvent, reducing the temperature to 50 to 80 DEG C, adding 70 to 85 parts of de-ionized water, performing complete stirring and regulating the pH to a proper value to obtain the composite waterborne
alkyd resin. The composite waterborne alkyd resin has the beneficial effect that the prepared composite waterborne alkyd resin has extraordinarily high storage stability.