Electrostatic dissipative coatings
The invention pertains generally to a composition which comprises: at least one two-part epoxy resin; Part A of the epoxy resin comprising at least one polyepoxide; and Part B of the epoxy resin comprising at least one amine hardener, at least one single-walled carbon nanotube; at least one polyhedral silsesquioxane; a coated composition of the two-part epoxy resin having a conductivity of a maximum of 1.0×109 ohms; and the coated composition having a gloss as measured by a reflected image quality of the coated composition is at least 50.
1 . A composition comprising:
at least one two-part epoxy resin;
Part A of the epoxy resin comprising at least one polyepoxide and at least one polyhedral silsesquioxane, the at least one polyhedral silsesquioxane including an inorganic silsesquioxane at the core and at least one organic polyethylene glycol group attached at a corner of the core;
Part B of the epoxy resin comprising at least one amine hardener;
at least one single-walled carbon nanotube;
the composition having a conductivity of a maximum of 1.0×10 9 ohms; and
the composition having a gloss as measured by a reflected image quality of at least 50.
2 . The composition of claim 1 wherein a weight ratio of the polyhedral silsesquioxane to single-walled carbon nanotube ranges from about 4:1 to 10:1 inclusive.
3 . The composition of claim 2 wherein the weight ratio of the polyhedral silsesquioxane to single-walled carbon nanotube is at least the weight ratio is 5:1.
4 . The composition of claim 3 wherein the weight ratio of the polyhedral silsesquioxane to single-walled carbon nanotube is at least 7:1.
5 . The composition of claim 4 wherein the weight ratio of the polyhedral silsesquioxane to single-walled carbon nanotube is at least 8.5:1.
6 . The composition of claim 1 which further comprises: a pigment.
7 . The composition of claim 6 wherein the pigment comprises a titanium dioxide.
8 . The composition of claim 6 wherein the pigment comprises a carbon black.
9 . The composition of claim 1 wherein the at least one amine hardener is a blend of at least two amine hardeners.
10 . The composition of claim 9 wherein the at least one amine hardener is a blend of at least three amine hardeners having a coated composition with a Shore D hardness >80.
11 . The composition of claim 1 wherein the reflected image quality of the two-part epoxy resin is at least 60.
12 . The composition of claim 1 wherein the gloss (20°) of the two-part epoxy resin is at least 80.
13 . The composition of claim 1 wherein the polyhedral silsesquioxane is selected from the group consisting of homoleptic compositions, heteroleptic compositions, functionalized homoleptic compositions and functionalized heteroleptic compositions.
14 . The composition of claim 13 wherein
the homoleptic compositions are [(RSiO 1.5 ) n ] Σ# ;
the heteroleptic compositions are [(RSiO 1.5 ) m (R′SiO 1.5 ) n ] Σ# ;
the functionalized homoleptic compositions are [(RSiO 1.5 ) m (RXSiO 1.5 ) n ] Σ# ;
the functionalized heteroleptic compositions are [(RSiO 1.5 ) m (R′SiO 1.5 ) n (RXSiO 1.0 ) p ] Σ# and wherein
R and R′ are independently selected from the group consisting of 1 to 40 carbon aliphatic, aromatic, olefinic or alkoxy groups;
m, n and p represent the stoichiometry of the formula composition and ranges from 0 to 100 inclusive;
Σ indicates that the composition forms a nanostructure; and
# refers to the number of silicon atoms contained within the nanostructure and is equal to the sum of m+n.
15 . The composition of claim 1 wherein the at least one single-walled carbon nanotube is a one-atom-thick graphene sheet rolled in a tube more than 5 μm long.
16 . The composition of claim 1 wherein the composition is applied to a floor.
17 . The composition of claim 1 , wherein the composition is formed by mixing the at least one polyepoxide with the at least one polyhedral silsesquioxane before mixing the at least one polyhedral silsesquioxane with the at least one amine hardener.