Superhydrophobic compositions
View Patent ↗The present invention relates to a stable dispersion comprising at least, but not limited to, three key elements that, when combined accordingly, can achieve the desired superhydrophobic results; the at least three elements being a hydrophobic component, nano-structured particles and water.
1. A superhydrophobic dispersion composition comprising:
a. a water dispersible hydrophobic component, wherein the hydrophobic component comprises a perfluorinated polymer modified with a comonomer;
b. a nanoclay comprising nano-structured particles; and
c. water, wherein a surface treated with the superhydrophobic dispersion has a water contact angle greater than 150°, wherein the superhydrophobic composition is free of an organic solvent, wherein the ratio of the weight of the nanoclay to the weight of the nanoclay and the hydrophobic component is above 0.2 and less than 0.5.
2. The superhydrophobic composition of claim 1 wherein the hydrophobic component further comprises a fluorinated polymer.
3. The superhydrophobic composition of claim 1 wherein the hydrophobic component and nano-structured particles are present in an amount of from about 1.0% to about 3.0%, by weight of the dispersion.
4. The superhydrophobic composition of claim 1 wherein the water is present in an amount of from about 95% to about 99%, by weight of the composition.
5. The superhydrophobic composition of claim 1 further comprising a surfactant in an amount of from about 0% to about 3%, by weight of the composition.
6. The superhydrophobic composition of claim 5 wherein the surfactants are selected from nonionic, cationic, or anionic surfactants.
7. The superhydrophobic composition of claim 1 wherein the comonomer is an ethylenically unsaturated carboxylic acid.
8. The superhydrophobic composition of claim 1 further comprising a stabilizing agent selected from the group consisting of long chain fatty acids, long chain fatty acid salts, ethylene-acrylic acid, ethylene-methacrylic acid copolymers, sulfonic acid, and acetic acid.
9. The superhydrophobic composition of claim 1 further comprising a filler selected from the group consisting of milled glass, calcium carbonate, aluminum trihydrate, talc, antimony trioxide, fly ash, and clays.
10. The superhydrophobic composition of claim 9 wherein the filler is present in an amount from about 0.01 to about 600 parts, by weight of the hydrophobic component.
11. The superhydrophobic composition of claim 1 , wherein the nanoclay is a bentonite clay.