Solventless Methods Of Coating A Carbon Nanotube Network And Carbon Nanotube Networks Coated With A Polymer

• US 20120138589A1
• Filed: 05/14/2010
• Published: 06/07/2012
• Est. Priority Date: 05/14/2009
• Status: Active Grant

• Current Assignee: Battelle Memorial Institute
• Original Assignee: Battelle Memorial Institute
• Inventors: Heintz, Amy M., Burton, Brett R., Lastrapes, Timothy J., Mitchell, Katherine P., Feier, Ioan I.
• Granted Patent: US 9,732,238 B2
• Time in Patent Office: Days
• US Class Current: 219/202
• CPC Class Codes: C08K 3/04 Carbon
• CPC Class Codes: C08K 9/08 Ingredients agglomerated by treatment with a binding agent
• CPC Class Codes: C09D 5/00 Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced electrically insulating plastics, resins or waxes H01B3/30; Filling pastes
• CPC Class Codes: C09D 5/24 Electrically-conducting paints conductive materials H01B1/00
• CPC Class Codes: C09D 7/62 modified by treatment with other compounds
• CPC Class Codes: C09D 7/65 macromolecular C09D7/41-C09D7/48 take precedence
• CPC Class Codes: C09D 7/70 characterised by shape, e.g. fibres, flakes or microspheres
• CPC Class Codes: H01B 1/04 mainly consisting of carbon-silicon compounds, carbon or silicon
• CPC Class Codes: H05B 2214/00 Aspects relating to resistive heating, induction heating and heating using microwaves, covered by groups H05B3/00, H05B6/00
• CPC Class Codes: H05B 2214/03 Heating of hydrocarbons

Abstract

A method of coating a carbon nanotube material with a solventless coating composition is described. The resulting coating has been shown to preserve the conductivity of the conductive layer and protect the conductive layer from the effects of subsequent coating compositions. Examples are shown in which the coating formulation comprises a polyol and an isocyanate. A layer material comprising a polyurethane coating on a carbon nanotube network layer is also described.

Claims

1. A method of making a layered CNT-containing composition, comprising:

providing a CNT layer that is disposed on a substrate; and

applying a solventless polymer precursor directly onto the CNT layer.

2. The method of claim 1 further comprising curing the polymer precursor to form a polymer layer in contact with the CNT layer.

3. The method of claim 2 wherein the resistivity of CNT layer changes by 81% or less after applying and curing the coating.

4. The method of claim 2 wherein the resistivity of CNT layer changes by 10% or less after applying and curing the coating.

5. The method of claim 1 wherein the solventless polymer precursor comprises a diisocyanate and a diol.

6. A layered article made by the method of claim 1.

7. A layered CNT-containing article, comprising:

a substrate;

a conductive CNT network layer disposed between the substrate and a polyurethane coating;

wherein the polyurethane coating is in direct contact with the CNT layer; and

further wherein the underlying CNT layer has a sheet resistance of 120·

/square or less.

8. The article of claim 7 wherein the underlying CNT layer has a sheet resistance of 25·

/square or less.

9. The article of claim 7 wherein the underlying CNT layer has a sheet resistance of 1·

/square or less.

10. The article of claim 7 wherein the CNT network layer is p-doped.

11. The article of claim 7 wherein the CNT network layer does not contain residual dispersing agent or surfactant.

12. The article of claim 7 wherein the combined CNT network layer and polyurethane coating consist essentially of CNTs and polyurethane.

13. The article of claim 7 wherein the polyurethane does not contain polyether moieties.

14. The article of claim 7 wherein the polyurethane does not contain any sulfate groups.

15. The article of claim 7 wherein the polyurethane comprises an azelaic (C₉) ester moiety.

16. The article of claim 7 wherein the underlying CNT layer maintains shielding effectiveness greater than 20 dB.

17. The article of any of claim 7 having a geometric surface area of at least 1 cm×

1 cm.

18. An airplane wing comprising the article of claim 7.

19. A method of removing ice or preventing the formation of ice, comprising:

exposing the article of claim 7 to icing conditions, and passing a current through the article, resulting in resistive heating.