The invention discloses one-component transparent waterborne
polyurethane emulsion waterproof paint and a preparation method thereof and relates to
polyurethane waterproof paint. The waterproof paint comprises a resin phase and a nano-material phase. The preparation method comprises the following steps:
diol and a hydrophilic chain
extender are dried, and other prepolymerization monomers are dried;
diol, diisocyanate,
fluorine-containing
acrylate monomers and hydroxyl-terminated
siloxane after a
dehydration process are added to a four-neck flask, the mixture is heated and added with an organic
tin initiator for a reaction under the protection of
nitrogen, and the mixture is heated and added with
dimethylolpropionic acid for
continuous reaction; after a
reaction system is cooled, the chain
extender and
acrylate monomers are added for a reaction; after a
prepolymer is cooled to the temperature lower than the
room temperature, a neutralizer and a cross-linking agent are added; then deionized water is added for emulsification, and mixed liquor A is obtained; a
silane coupling agent is dissolved in absolute ethyl
alcohol, silica microspheres are added to absolute ethyl
alcohol, and mixed liquor B is obtained; the mixed liquor B is added to the mixed liquor A, the mixture is heated, and a
radical initiator is added for a reaction; an
organic solvent is removed, and the one-component transparent waterborne
polyurethane emulsion waterproof paint is obtained.