Multi-functional additive for mar and scratch resistance in chemical coating compositions
A mar and scratch resistant additive that possesses multifunctional and other characteristics is described. The additive comprises a binder system platform that is easily introduced into a wide range of chemical coating platforms. The additive may also be introduced to these coatings by way of a silica carrier to simplify its use.
1. A mar and scratch resistant additive comprising:
55.0 to 65.0 wt. % of a first polyester resin having a T g between 62-68° C.;
3.0 to 7.0 wt. % of a first acrylic resin having a T g between 42-52° C.;
10.0 to 20.0 wt. % of a second acrylic resin having a T g between 62-68° C.;
5.0 to 15.0 wt. % of a second polyester resin having a T g between 52-58° C.;
2.5 to 5.5 wt. % of a blocked aliphatic, cycloaliphatic, or aromatic polyisocyanate;
0.01 to 0.5 wt. % of a catalyst; and
a remainder additive components including a flow modifier and a degassing agent, wherein each additive component comprises no more than 1.5 wt. %.
2. The mar and scratch additive according to claim 1 wherein the remainder additive components also include at least one selected from an anti-corrosion additive, an antioxidant, and an ultra-violet inhibitor.
3. The mar and scratch additive according to claim 2 wherein the ultraviolet inhibitor includes at least selected from a butylmalonate-based component, a sebacate-based component, and a triazin-based phenol component.
4. The mar and scratch additive according to claim 1 wherein the catalyst is at least one selected from stannous octoate, 2-methyl imidazole, 2-propyl imidazole, and dibutyl tin dilauratel.
5. The mar and scratch additive according to claim 1 wherein the additive is provided on a silica carrier.
6. The mar and scratch additive according to claim 5 wherein a relative weight ratio of the additive to the silica carrier is between 60:40 and 70:30.
7. The mar and scratch additive according to claim 5 wherein the silica carrier is selected from (3-aminopropyl) trimethoxysilane, silicon dioxide, and combinations thereof.
8. The mar and scratch additive according to claim 5 wherein the additive is formed as particles each having a size of less than 5 micrometers.
9. The mar and scratch additive according to claim 8 wherein the particles each have a size of greater than 100 nanometers.
10. A chemical coating composition comprising at least one finished coating component provided at a weight ratio of 98 parts or more of the finished coating component and between 0.05 to 2 parts of the mar and scratch additive of claim 1 .
11. The coating composition of claim 10 wherein the finished coating component forms a fusion powder coating film when the composition is cured.
12. The coating composition according to claim 10 wherein the finished coating component includes a liquid carrier that is removed from a final, coating film when the composition is cured.