Conductive composite and method for manufacturing a conductive composite

Patent metadata

Field	Value
Publication number	US-11559971-B2
Application number	US-202016867765-A
Country	US
Kind code	B2
Filing date	May 6, 2020
Priority date	May 6, 2020
Publication date	Jan 24, 2023
Grant date	Jan 24, 2023

Abstract

A conductive composite includes a first layer of elastomeric polymer, a layer of electrically conductive paste on the first layer of elastomeric polymer, and a second layer of elastomeric polymer on the layer of electrically conductive paste. A reinforcement mesh is in contact with the layer of electrically conductive paste.

First claim

What is claimed is:

1. A conductive composite comprising:
a first layer of elastomeric polymer;
a layer of electrically conductive paste on the first layer of elastomeric polymer;
a second layer of elastomeric polymer on the layer of electrically conductive paste; and
a reinforcement mesh between the first layer of elastomeric polymer and the second layer of elastomeric polymer, wherein the reinforcement mesh is infiltrated with the layer of electrically conductive paste, and wherein the reinforcement mesh is configured to move freely with respect to the first layer of elastomeric polymer and the second layer of elastomeric polymer.

2. The conductive composite of claim 1 wherein the layer of electrically conductive paste comprises a metal or alloy with a melting temperature below about 60° C. and a thickening agent.

3. The conductive composite of claim 2 wherein the metal or alloy comprises at least one of gallium, mercury, indium, tin, bismuth, phosphorus, lead, zinc, cadmium, antimony, and combinations thereof.

4. The conductive composite of claim 2 wherein the thickening agent comprises an organic thickening agent, wherein the organic thickening agent comprises at least one of maltose, carbon, and combinations thereof.

5. The conductive composite of claim 2 wherein the thickening agent has an average aspect ratio in a range of 1 to about 2.

6. The conductive composite of claim 2 wherein the thickening agent has an average aspect ratio in a range of 1 to 2 and an average maximum dimension in range of from about 0.1 to about 500 μm.

7. The conductive composite of claim 2 wherein the thickening agent has an average aspect ratio of greater than about 2.

8. The conductive composite of claim 1 wherein the layer of electrically conductive paste further comprises a compatibilizing agent.

9. The conductive composite of claim 1 wherein the layer of electrically conductive paste further comprises a compatibilizing agent, and wherein the compatibilizing agent comprises at least one of an organic compatibilizing agent, an inorganic compatibilizing agent, and combinations thereof.

10. The conductive composite of claim 1 further comprising an additive to increase thermo-oxidative stability, wherein the additive comprises at least one of a phosphate, an iron oxide, a phenolic, an antioxidant, a metal passivator, and combinations thereof.

11. The conductive composite of claim 1 wherein the first layer of elastomeric polymer comprises at least one of siloxane, fluorosiloxane, perfluoropolyether, polybutadiene, polyester, polycarbonate, polyurethane, polyurea, polyurethane-urea, epoxy, acrylate, natural rubber, butyl rubber, polyacrylonitriles, ethylene propylene diene monomer (EPDM) rubber, and combinations thereof.

12. The conductive composite of claim 1 wherein the second layer of elastomeric polymer comprises at least one of siloxane, fluorosiloxane, perfluoropolyether, polybutadiene, polyester, polycarbonate, polyurethane, polyurea, polyurethane-urea, epoxy, acrylate, natural rubber, butyl rubber, polyacrylonitriles, ethylene propylene diene monomer (EPDM) rubber, and combinations thereof.

13. The conductive composite of claim 1 wherein a thickness of the first layer of elastomeric polymer is within a range of from about 0.01 mm to about 100 mm.

14. The conductive composite of claim 1 wherein a thickness of the layer of electrically conductive paste is less than or equal to at least one of a thickness first layer of elastomeric polymer and a thickness of the second layer of elastomeric polymer.

15. The conductive composite of claim 1 wherein the layer of electrically conductive paste is homogeneous.

16. The conductive composite of claim 1 wherein the layer of electrically conductive paste is heterogeneous.

17. The conductive composite of claim 1 wherein the reinforcement mesh comprises at least one of a knit fabric, a woven fabric, and combinations thereof.

18. The conductive composite of claim 1 wherein the reinforcement mesh comprises a non-conductive fabric that comprises at least one of polyether-polyurea copolymer, latex, poly-paraphenylene terephthalamide, aramid, nylon, polyester, and combinations thereof.

19. The conductive composite of claim 1 wherein the reinforcement mesh comprises a conductive fabric that comprises at least one of conductive filaments, coated non-conductive fabric, and combinations thereof.

20. The conductive composite of claim 1 wherein the reinforcement mesh comprises a conductive fabric that comprises conductive filaments, wherein the conductive filaments comprise at least one of silver filaments, copper filaments, brass filaments, nickel filaments, stainless steel filaments, steel filaments, aluminum filaments, carbon filaments, coated carbon filaments, titanium filaments, tungsten filaments, tin filaments, zinc filaments, and combinations thereof.

21. The conductive composite of claim 1 wherein the reinforcement mesh comprises a conductive fabric that comprises coated non-conductive fabric, wherein the coated non-conductive fabric comprises at least one of metallic coated polyether-polyurea copolymer, metallic coated latex, metallic coated poly-paraphenylene terephthalamide, metallic coated aramid, metallic coated nylon, metallic coated polyester, carbon coated polyether-polyurea copolymer, carbon coated latex, carbon coated poly-paraphenylene terephthalamide, carbon coated aramid, carbon coated nylon, carbon coated polyester, and combinations thereof.

22. The conductive composite of claim 1 wherein the conductive composite exhibits a minimum sheet resistance of less than about 100 Ohm/sq.

23. The conductive composite of claim 1 wherein the conductive composite exhibits an elongation at break of greater than or equal to about 10%.

24. The conductive composite of claim 1 wherein the conductive composite exhibits a tensile strength greater than or equal to about 3 MPa.

25. The conductive composite of claim 1 wherein the conductive composite has a density of less than about 7 g/mL.

26. The conductive composite of claim 1 wherein the electrically conductive paste has a loss modulus greater than a storage modulus.

27. The conductive composite of claim 1 is a portion of an aircraft.

28. The conductive composite of claim 1 is at least a portion of at least one of a wing and a fuselage of an aircraft.

29. The conductive composite of claim 1 is at least one of a seal and a gasket.

30. The conductive composite of claim 1 wherein the layer of electrically conductive paste is a continuous layer of electrically conductive paste.

31. A method for manufacturing a conductive composite, the method comprising:
forming a first layer of elastomeric polymer;
forming a layer of electrically conductive paste on the first layer of elastomeric polymer, wherein a reinforcement mesh is infiltrated with the layer of electrically conductive paste; and
forming a second layer of elastomeric polymer on the layer of electrically conductive paste, and wherein the reinforcement mesh is configured to move freely with respect to the first layer of elastomeric polymer and the second layer of elastomeric polymer.

Assignees

• Boeing Co

Inventors

• Gross Adam F
• Dustin Ashley
• Nowak Andrew P
• Guan Xin
• Sorensen Adam E
• Sharp Richard E

Classifications

• B64C1/068

  Fuselage sections · CPC title

• B32B2605/18

  Aircraft · CPC title

• B32B5/02

  characterised by structural features of a {fibrous or filamentary} layer {(layer formed of metallic wires B32B15/02; layer formed of natural mineral fibres B32B19/02; layer formed of wood fibres B32B21/02)} · CPC title

• B64C3/20

  Integral or sandwich constructions · CPC title

• B32B2307/202

  Conductive · CPC title