Glass Article Containing a Composite Coating
A glass article that comprises a composite coating is provided. The coating is provided on a surface of a glass substrate and comprises a paint layer that overlies the surface of the glass substrate and a hydrophobic layer that overlies the paint layer. The coating may exhibit a ΔE value of about 2 or less after being exposed to a copper-accelerated acetic acid-salt spray (“CASS”) in accordance with ASTM B368-09 (2014).
1 . A glass article comprising a composite coating that is provided on a surface of a glass substrate, wherein the composite coating comprises a paint layer that overlies the surface of the glass substrate and a hydrophobic layer that overlies the paint layer, wherein the coating exhibits a ΔE value of about 2 or less after being exposed to a copper-accelerated acetic acid-salt spray (“CASS”) in accordance with ASTM B368-09 (2014).
2 . The glass article of claim 1 , wherein the paint layer contains a glass frit and a thermoset polymer that is formed from a crosslinkable resin, and the hydrophobic layer contains an organosilane compound that is bonded to the paint layer.
3 . A glass article comprising a glass substrate and a composite coating that is provided on a surface of a glass substrate, wherein the composite coating comprises a paint layer that overlies the surface of the glass substrate and a hydrophobic layer that overlies the paint layer, wherein the paint layer contains a glass frit and a thermoset polymer, and wherein the hydrophobic layer contains an organosilane compound that is bonded to the paint layer.
4 . The glass article of claim 3 , wherein the coating exhibits a ΔE value of about 2 or less after being exposed to a copper-accelerated acetic acid-salt spray (“CASS”) in accordance with ASTM B368-09 (2014).
5 . The glass article of claim 1 , wherein the glass substrate has a thickness of from about 0.1 to about 15 millimeters.
6 . The glass article of claim 1 , wherein the glass substrate has a first surface and an opposing second surface, wherein the composite coating is provided on the first surface.
7 . The glass article of claim 2 , wherein the glass frit contains bismuth oxide.
8 . The glass article of claim 2 , wherein the crosslinkable resin includes a (meth)acrylic resin, (meth)acrylamide resin, alkyd resin, phenolic resin, amino resin, silicone resin, epoxy resin, or a combination thereof.
9 . The glass article of claim 2 , wherein the crosslinkable resin includes a polyol resin.
10 . The glass article of claim 9 , wherein the polyol resin is a copolymer of one or more alkyl esters of (meth)acrylic acid optionally in combination with one or more ethylenically unsaturated monomers.
11 . The glass article of claim 10 , wherein the polyol resin is crosslinked with a melamine crosslinking agent.
12 . The glass article of claim 1 , wherein the paint layer has a black color.
13 . The glass article of claim 1 , wherein the paint layer contains one or more pigments.
14 . The glass article of claim 1 , wherein the paint layer contains organic material in an amount of from about 1 wt. % to about 11 wt. %.
15 . The glass article of claim 1 , wherein the paint layer contains organic material in an amount of from about 11 wt. % to about 25 wt. %.
16 . The glass article of claim 2 , wherein the organosilane compound is an organoalkoxysilane compound having the following general formula:
R 1 a Si(OR 2 ) 4-a
wherein,
a is from 0 to 3;
R 1 is an alkyl, alkenyl, aryl, heteroaryl, cycloalkyl, heterocyclyl, halo, or haloalkyl; and
R 2 is an alkyl.
17 . The glass article of claim 16 , wherein a is 1.
18 . The glass article of claim 17 , wherein R 1 is an alkyl, aryl, or haloalkyl.
19 . The glass article of claim 16 , wherein the organoalkoxysilane compound includes ethyltrimethoxysilane, ethyltriethoxysilane, phenytrimethoxysilane, phenytriethoxysilane, hexyltrimethoxylsilane, hexyltriethoxylsilane, hexyltrimethoxylsilane, heptadecapfluoro-1,2,2-tetrahydrodecyltrimethoxysilane, 3-glycidoxyporpyltrimethoxysilane, or a combination thereof.
20 . The glass article of claim 1 , wherein the coating exhibits an advancing contact angle of about 50° or more as determined in accordance with ASTM D7334-08 (2013).
21 . The glass article of claim 20 , wherein the coating exhibits an advancing contact angle of about 50° or more after being rubbed with methyl ethyl ketone for 300 cycles in accordance with ASTM D5402-15.
22 . The glass article of claim 20 , wherein the coating exhibits an advancing contact angle of about 50° or more after being soaked in a 2 wt. % HCl aqueous solution for 180 minutes.
23 . The glass article of claim 20 , wherein the coating exhibits an advancing contact angle of about 50° or more after being soaked in a 4 wt. % NaOH aqueous solution for 180 minutes.
24 . A method for forming a glass article, the method comprising:
applying a coating formulation to a surface of a glass substrate, wherein the coating formulation contains a crosslinkable resin and a glass frit;
curing the coating formulation to form a paint layer;
applying a solution of a hydrophobic material to the paint layer; and
curing the hydrophobic material to form a hydrophobic layer that is bonded to the paint layer.
25 . The method of claim 24 , wherein the paint layer and glass substrate are subjected to a heat treatment prior to bonding of the hydrophobic layer to the paint layer, wherein the heat treatment is conducted at a temperature of from about 500° C. to about 800° C.
26 . The method of claim 24 , wherein the hydrophobic material includes an organosilane compound.
27 . The method of claim 26 , wherein the organosilane compound is subjected to a hydrolysis reaction and then reacted with the paint layer through a condensation reaction.
28 . The method of claim 24 , wherein the solution contains an organic solvent and optionally an acid catalyst.
29 . The method of claim 24 , wherein the solution is cured at a temperature of from about 50° C. to about 350° C.