Coating compositions for application utilizing a high transfer efficiency applicator and methods and systems thereof
A coating composition for application to a substrate utilizing a high transfer efficiency applicator is provided herein. The coating composition includes monomeric, oligomeric, or polymeric compounds having a number average molecular weight of from about 400 to about 20,000 and having a free-radically polymerizable double bond. The coating composition further includes a photo initiator. The coating composition has an Ohnesorge number (Oh) of from about 0.01 to about 12.6. The coating composition has a Reynolds number (Re) of from about 0.02 to about 6,200. The coating composition has a Deborah number (De) of from greater than 0 to about 1730.
1. A system for applying a coating composition to a substrate utilizing a high transfer efficiency applicator, the system comprising:
a high transfer efficiency applicator comprising a nozzle, the nozzle defining a nozzle orifice having a nozzle diameter of from about 0.00002 m to about 0.0004 m; and
a reservoir in fluid communication with the high transfer efficiency applicator and configured to contain the coating composition;
wherein the coating composition comprises;
monomeric, oligomeric, or polymeric compounds having a number average molecular weight of from about 400 to about 20,000 and having a free-radically polymerizable double bond, and
a photo initiator;
wherein the coating composition has a viscosity is an amount of from about 0.002 Pa*s to about 0.2 Pa*s as measured according to ASTM 7867-13 with cone-and-plate or parallel plates at a shear rate of 1000 sec-1, a density of from about 838 kg/m 3 to about 1557 kg/m 3 , a surface tension of from about 0.015 N/m to about 0.05 N/m, and a relaxation time of from about 0.00001 to about 1 s; and
wherein the high transfer efficiency applicator is configured to receive the coating composition from the reservoir and configured to expel the coating composition through the nozzle orifice to the substrate to form a coating layer.
2. The system of claim 1 , wherein the coating layer formed in the presence of high-energy radiation.
3. The system of claim 2 , wherein the high-energy radiation is generated by a device configured to generate ultra violet light, a laser, an electron beam, or combinations thereof.
4. The system of claim 3 , wherein the device is coupled to the high transfer efficiency applicator and configured to direct the high-energy radiation toward the coating composition after expulsion through the nozzle orifice of the high transfer efficiency applicator.
5. The system of claim 1 , wherein the high transfer efficiency applicator is configured to expel the coating composition through the nozzle orifice at an impact velocity of from about 0.2 m/s to about 20 m/s.
6. The system of claim 5 , wherein the high transfer efficiency applicator is configured to expel the coating composition through the nozzle orifice at an impact velocity of from about 0.4 m/s to about 10 m/s.
7. The system of claim 1 , wherein the nozzle orifice has a nozzle diameter in an amount of from about 0.00004 m to about 0.00025 m.
8. The system of claim 1 , wherein the coating composition has a viscosity of from about 0.005 Pa*s to about 0.05 Pa*s as measured according to ASTM 7867-13 with cone-and-plate or parallel plates at a shear rate of 1000 sec-1, wherein the coating composition has a density of from about 958 kg/m 3 to about 1319 kg/m 3 , wherein the coating composition has a surface tension of from about 0.02 N/m to about 0.032 N/m, and wherein the coating composition has a relaxation time of from about 0.00001 to about 1 s.
9. The system of claim 1 , wherein the coating composition is expelled from the high transfer efficiency applicator as a droplet having a particle size of at least 10 microns.
10. The system of claim 1 , wherein at least 80% of the droplets of the coating composition expelled from the high transfer efficiency applicator contact the substrate.
11. The system of claim 1 , wherein at least 80% of the droplets of the coating composition expelled from the high transfer efficiency applicator are monodispersed such that the droplets have a particle size distribution of less than 20%.
12. The system of claim 1 , wherein at least 80% of the droplets of the coating composition expelled from the high transfer efficiency applicator to the substrate remain as a single droplet after contact with the substrate.
13. The system of claim 1 , wherein at least 80% of the droplets of the coating composition expelled from the high transfer efficiency applicator to the substrate remain as a single droplet after expulsion from the nozzle orifice of the high transfer efficiency applicator.
14. The system of claim 1 , wherein the coating layer is a substantially uniform layer according to macroscopic analysis.
15. The system of claim 1 , wherein the substrate comprises a metal-containing material, a plastic-containing material, or a combination thereof.
16. The system of claim 1 , wherein the substrate is substantially non-porous.
17. A method of applying a coating composition to a substrate utilizing a high transfer efficiency applicator, wherein the coating composition comprises monomeric, oligomeric, or polymeric compounds having a number average molecular weight of from about 400 to about 20,000 and having a free-radically polymerizable double bond, and a photo initiator, and wherein the coating composition has a viscosity of from about 0.002 Pa*s to about 0.2 Pa*s as measured according to ASTM 7867-13 with cone-and-plate or parallel plates at a shear rate of 1000 sec-1, a density of from about 838 kg/m 3 to about 1557 kg/m 3 , a surface tension of from about 0.015 N/m to about 0.05 N/m, and a relaxation time of from about 0.00001 to about 1 s, the method comprising the steps of:
providing the coating composition to the high transfer efficiency applicator comprising a nozzle, the nozzle defining a nozzle orifice having a nozzle diameter of from 0.00002 m to 0.0004 m; and
applying the coating composition to the substrate through the nozzle orifice to form a coating layer.
18. A system for applying a coating composition to a substrate utilizing a high transfer efficiency applicator, the system comprising:
a high transfer efficiency applicator comprising a nozzle, the nozzle defining a nozzle orifice having a nozzle diameter of from about 0.00002 m to about 0.0004 m; and
a reservoir in fluid communication with the high transfer efficiency applicator and configured to contain the coating composition;
wherein the coating composition comprises;
monomeric, oligomeric, or polymeric compounds having a number average molecular weight of from about 400 to about 20,000 and having a free-radically polymerizable double bond, and
a photo initiator;
wherein the coating composition has an Ohnesorge number (Oh) of from about 0.01 to about 12.6, the coating composition has a Reynolds number (Re) of from about 0.02 to about 6,200, and the coating composition has a Deborah number (De) of from greater than 0 to about 1730; and
wherein the high transfer efficiency applicator is configured to receive the coating composition from the reservoir and configured to expel the coating composition through the nozzle orifice to the substrate to form a coating layer.