Conductive Fiber Glass Strands, Methods Of Making The Same, And Composites Comprising The Same

• US 20100310851A1
• Filed: 05/18/2010
• Published: 12/09/2010
• Est. Priority Date: 05/18/2009
• Status: Abandoned Application

• Current Assignee: PPG Industries Ohio Incorporated (Nouryon BV)
• Original Assignee: PPG Industries Ohio Incorporated (Nouryon BV)
• Inventors: Lai, Xiaoyun, Montague, Robert, Gilmore, Dennis, Peters, James Carl
• Application Number:
  US12/782,368
• Publication Number:
  US 20100310851A1
• Time in Patent Office: Days
• US Class Current: 428/300.1
• CPC Class Codes: C03C 25/44 Carbon, e.g. graphite
• CPC Class Codes: C03C 25/47 containing particles, fibres or flakes, e.g. in a continuous phase
• CPC Class Codes: C08J 2339/06 Homopolymers or copolymers of N-vinyl-pyrrolidones
• CPC Class Codes: C08J 2363/00 Characterised by the use of epoxy resins; Derivatives of epoxy resins
• CPC Class Codes: C08J 2375/04 Polyurethanes
• CPC Class Codes: C08J 3/07 from polymer solutions
• CPC Class Codes: H01B 1/24 the conductive material comprising carbon-silicon compounds, carbon or silicon
• CPC Class Codes: Y10T 428/249948 Fiber is precoated
• CPC Class Codes: Y10T 428/292 In coating or impregnation

Abstract

The present invention, in one aspect, provides a fiber glass strand comprising an electrically conductive structure comprising one or more glass fibers coated with a coating composition comprising an aqueous dispersion, the aqueous dispersion comprising carbon nanotubes and a polymeric carrier.

Claims

1. A fiber glass strand comprising:

an electrically conductive structure comprising one or more glass fibers coated with a coating composition comprising an aqueous dispersion, the aqueous dispersion comprising carbon nanotubes and a polymeric carrier, wherein the fiber glass strand has an electrical resistivity ranging from about 0.1 k≠

·

cm<sup>−

1</sup> to about 20 MΩ

·

cm<sup>−

1</sup>.

2. The fiber glass strand of claim 1, wherein the fiber glass strand has an electrical resistivity less than about 10 kΩ

·

cm<sup>−

1</sup>.

3. The fiber glass strand of claim 1, wherein the strand has a volume resistivity ranging from about 2 Ω

·

cm to about 0.1 MΩ

·

cm.

4. The fiber glass strand of claim 1, wherein the carbon nanotubes are present in the aqueous dispersion in an amount ranging from about 0.1 weight percent to about 3.5 weight percent on a total solids basis.

5. The fiber glass strand of claim 1, wherein the polymeric carrier comprises an aqueous dispersion of one or more polymeric species.

6. The fiber glass strand of claim 5, wherein the one or more polymeric species comprises a polyvinylpyrrolidone, a polyurethane, an epoxy or combinations thereof.

7. The fiber glass strand of claim 1, wherein the strand has a loss on ignition (LOI) ranging from about 2 to about 9.

8. The fiber glass strand of claim 1, wherein the carbon nanotubes comprise single-walled carbon nanotubes, multi-walled carbon nanotubes or mixtures thereof.

9. The fiber glass strand of claim 1, wherein the aqueous dispersion further comprises at least one additional component, the at least one additional component comprising a film former, a coupling agent, a lubricant, a surfactant, a biocide or an anti-foaming agent or mixtures thereof.

10. The fiber glass strand of claim 9, wherein the at least one additional component comprises a film former, the film former comprising polyurethane, epoxide, polyvinylpyrrolidone, polyacrylate, polyester, polyvinylacetate or polyvinyl alcohol or combinations thereof.

11. The fiber glass strand of claim 10, wherein the film former is present in the aqueous dispersion in an amount of at least about 50 weight percent on a total solids basis.

12. The fiber glass strand of claim 10, wherein the film former is present in an amount ranging from about 60 weight percent to about 80 weight percent on a total solids basis.

13. The fiber glass strand of claim 9, wherein the at least one additional component comprises a coupling agent, the coupling agent comprising one or more organosilanes.

14. The fiber glass strand of claim 13, wherein the one or more organosilanes comprise aminofunctional silanes, non-aminofunctional silanes or combinations thereof.

15. The fiber glass strand of claim 13, wherein the one or more organosilanes are present in an amount up to about 10 weight percent on a total solids basis.

16. The fiber glass strand of claim 13, wherein the one or more organosilanes are present in an amount ranging from about 1 weight percent to about 5 weight percent on a total solids basis.

17. A method of making a fiber glass strand comprising an electrically conductive structure, the method comprising:

providing a coating composition comprising an aqueous dispersion, the aqueous dispersion comprising carbon nanotubes and a polymeric carrier;

drawing the fiber glass strand through a bath of the coating composition; and

removing excess coating composition from the fiber glass strand.

18. The method of claim 17, wherein the carbon nanotubes are present in the aqueous dispersion in an amount ranging from about 0.1 weight percent to about 3.5 weight percent on a total solids basis.

19. The method of claim 17, wherein the polymeric carrier comprises an aqueous dispersion of one or more polymeric species.

20. The method of claim 19, wherein the one or more polymeric species comprises a polyvinylpyrrolidone, a polyurethane, an epoxy or combinations thereof.

21. The method of claim 17, wherein the aqueous dispersion further comprises at least one additional component, the at least one additional component comprising a film former, a coupling agent, a lubricant, a surfactant, a biocide or an anti-foaming agent or mixtures thereof.

22. The method of claim 21, wherein the at least one additional component comprises a film former, the film former comprising polyurethane, epoxide, polyvinylpyrrolidone, polyacrylate, polyester, polyvinylacetate or polyvinyl alcohol or combinations thereof.

23. The method of claim 22, wherein the film former is present in the aqueous dispersion in an amount of at least about 50 weight percent on a total solids basis.

24. The method of claim 21, wherein the at least one additional component comprises a coupling agent, the coupling agent comprising one or more organosilanes.

25. The method of claim 24, wherein the one or more organosilanes comprise aminofunctional silanes, non-aminofunctional silanes or combinations thereof.

26. The method of claim 24, wherein the one or more organosilanes are present in an amount ranging from about 1 weight percent to about 5 weight percent on a total solids basis.

27. The method of claim 17, wherein removing excess coating composition from the fiber glass strand comprises passing the fiber glass strand through a die.

28. The method of claim 27, wherein a ratio of an opening of the die to a diameter of the fiber glass strand ranges from about 1.4 to about 2.

29. The method of claim 17, wherein the excess coating removed from the fiber glass strand is not returned directly to the bath of the coating composition.

30. The method of claim 17, wherein the fiber glass strand has a LOI ranging from about 2 to about 9.

31. The method of claim 17, wherein the fiber glass strand has an electrical resistivity ranging from about 0.1 kΩ

·

cm<sup>−

1</sup> to about 20 MΩ

·

cm<sup>−

1</sup>.

32. The method of claim 17, wherein the fiber glass strand has an electrical resistivity less than about 10 kΩ

·

cm<sup>−

1</sup>.

33. The method of claim 17, wherein the strand has a volume resistivity ranging from about 2 Ω

·

cm to about 0.1 MΩ

·

cm.

34. A polymeric composite comprising:

a polymeric resin; and

at least one fiber glass strand disposed in the polymeric resin, the fiber glass strand comprising an electrically conductive structure comprising one or more glass fibers coated with a coating composition comprising an aqueous dispersion, the aqueous dispersion comprising carbon nanotubes and a polymeric carrier.

35. The polymeric composite of claim 34, wherein the polymeric composite has a volume resistivity less than about 0.1 MΩ

·

cm.

36. The polymeric composite of claim 34, wherein the polymeric composite has a volume resistivity less than about 0.002 MΩ

·

cm.

37. The polymeric composite of claim 34, wherein the polymeric composite has a surface resistivity less than about 0.5 MΩ

/sq.

38. The polymeric composite of claim 34, wherein the polymeric composite has a surface resistivity less than about 0.25 MΩ

/sq.

39. The polymeric composite of claim 34, wherein the at least one fiber glass strand comprises a continuous fiber glass strand.

40. The polymeric composite of claim 34, wherein the at least one fiber glass strand is present in an amount of at least about 2 weight percent of the polymeric composite.

41. The polymeric composite of claim 34 further comprising non-electrically conductive fiber glass strands.

42. The polymeric composite of claim 41, wherein the non-electrically conductive fiber glass strands are present in an amount of up to about 70 weight percent of the polymeric composite.