Single-component coating having alkoxysilane-terminated N-substituted urea resins
The coating described herein attempts to provide this solution by synthesizing alkoxysilane-terminated N-substituted urea resins, then formulating them into moisture-curable single-component (1K) topside coatings. These coatings will provide greater external stability (to UV and visible radiation), cleanability, flexibility, cure times and lower VOC content than the currently qualified silicone alkyd topside coatings that are found on Navy ships. The single-component coating can include at least an alkoxysilane-terminated N-substituted urea resin, a reactive diluent, a pigment, a filler, and a catalyst. The resin can include an amino-functional silane substituted at the N-position and a non-aromatic isocyanate.
1. A single-component coating formula consisting of:
an alkoxysilane-terminated N-substituted urea resin having the following structure
in a weight amount of 63.50% of a total weight of the formula;
a reactive diluent in a weight amount of 12.00% of a total weight of the formula;
a pigment in a weight amount of 3.00% of a total weight of the formula;
titanium dioxide in a weight amount of 18.20% of a total weight of the formula;
a filler in a weight amount of 3.00% of a total weight of the formula; and
a catalyst in a weight amount of 0.30% of a total weight of the formula.
2. A single-component coating formula consisting of an alkoxysilane-terminated N-substituted urea resin having the following structure
in a weight amount of 65.47% of a total weight of the formula;
a reactive diluent in a weight amount of 12.44% of a total weight of the formula;
titanium dioxide in a weight amount of 21.77% of a total weight of the formula; and
a catalyst in a weight amount of 0.30% of a total weight of the formula.
3. A coating composition formula comprising an alkoxysilane-terminated N-substituted urea resin, a silicone-based resin, at least three types of pigment, titanium dioxide, dibutyltin dilaurate and amorphous silica, wherein the alkoxysilane-terminated N-substituted urea resin comprises the structure
4. The coating composition formula of claim 3 , wherein
the silicone-based resin is hexyltrimethoxysilane in a weight amount of 6.00% of a total weight of the formula;
the at least three pigments are provided in weight amounts of 1.74%, 1.17% and 0.60% of a total weight of the formula;
the titanium dioxide is provided in a weight amount of 7.00% of a total weight of the formula;
the amorphous silica is provided in a weight amount of 12.22% of a total weight of the formula; and
the dibutyltin dilaurate is provided in a weight amount of 0.48% of a total weight of the formula.
5. The coating composition formula of claim 3 , wherein
the silicone-based resin is methoxy-functional silicone resin in a weight amount of 12.22% of a total weight of the formula;
the at least three pigments are provided in weight amounts of 1.77%, 1.19% and 0.61% of a total weight of the formula;
the amorphous silica is provided in a weight amount of 12.22% of a total weight of the formula;
the titanium dioxide is provided in a weight amount of 7.12% of a total weight of the formula; and
the dibutyltin dilaurate is provided in a weight amount of 0.49% of a total weight of the formula.
6. The urea resin of claim 3 wherein the urea resin is 1,1′,1″-(6,6′,6″-(2,4,6-trioxo-1,3,5-triazinane-1,3,5-triyl)tris(hexane-6,1-diyl))tris(3-butyl-3-(trimethoxysilyl)propyl)urea).