RFL film or adhesive dip coating comprising carbon nanotubes and yarn comprising such a coating

• US 20090202764A1
• Filed: 11/26/2008
• Published: 08/13/2009
• Est. Priority Date: 11/26/2007
• Status: Abandoned Application

• Current Assignee: Porcher Industries (SOC Saumuroise de Participations)
• Original Assignee: Porcher Industries (SOC Saumuroise de Participations)
• Inventors: Tonon, Corinne, Lambour, Stephanie, Vial, Isabelle
• Application Number:
  US12/292,839
• Publication Number:
  US 20090202764A1
• Time in Patent Office: Days
• US Class Current: 428/36.300
• CPC Class Codes: B60C 9/0042 Reinforcements made of synthetic materials
• CPC Class Codes: C08J 2321/00 Characterised by the use of unspecified rubbers
• CPC Class Codes: C08J 3/215 at least one additive being also premixed with a liquid phase
• CPC Class Codes: C08J 5/06 using pretreated fibrous materials
• CPC Class Codes: C08K 3/04 Carbon
• CPC Class Codes: C08K 3/041 Carbon nanotubes
• CPC Class Codes: C08L 2666/16 Addition or condensation polymers of aldehydes or ketones according to C08L59/00 - C08L61/00; Derivatives thereof
• CPC Class Codes: C08L 61/04 Condensation polymers of aldehydes or ketones with phenols only
• CPC Class Codes: C08L 61/06 of aldehydes with phenols
• CPC Class Codes: C08L 7/02 Latex
• CPC Class Codes: C09D 107/02 Latex
• CPC Class Codes: D06M 11/74 with carbon or graphite; with carbides; with graphitic acids or their salts
• CPC Class Codes: D06M 15/693 with natural or synthetic rubber, or derivatives thereof
• CPC Class Codes: D06M 23/08 Processes in which the treating agent is applied in powder or granular form adhesives for multi-layer textile fabrics D06M17/00
• CPC Class Codes: Y10T 428/1369 Fiber or fibers wound around each other or into a self-sustaining shape [e.g., yarn, braid, fibers shaped around a core, etc.]
• CPC Class Codes: Y10T 428/268 Monolayer with structurally defined element
• CPC Class Codes: Y10T 428/292 In coating or impregnation

Abstract

The invention relates to an RFL film or adhesive dip coating comprising carbon nanotubes.

It also relates to a yarn coated or impregnated with a coating according to the invention.

It also relates to the use of the yarn thus treated for reinforcing an article based on a rubber material, said article possibly being a belt, a tube, a hose, a pipe or a tire and generally any object subjected to shear stresses.

Claims

1. RFL film or adhesive dip coating comprising carbon nanotubes.

2. Coating according to claim 1, comprising a blend of rubber latex and resorcinol-formaldehyde.

3. Coating according to claim 1, wherein it comprises from 0.5 to 10% by weight of carbon nanotubes, as solids.

4. Coating according to claim 1, wherein the nanotubes are of single-walled or multi-walled type.

5. Coating according to claim 1, wherein the nanotubes have an average diameter between 1 and 100 nanometers.

6. Coating according to claim 1, wherein the nanotubes have an average diameter between 1 and 30 nanometers.

7. Coating according to claim 1, wherein the nanotubes are completely or partly or not at all functionalized.

8. Yarn coated or impregnated with an RFL film or adhesive dip coating according to claim 1.

9. Yarn according to claim 8, wherein the yarn is selected from the group consisting of glass yarns, carbon yarns, aramid yarns, polyester yarns, polyvinyl alcohol yarns, polyamide yarns and rayon yarns.

10. Yarn according to claim 8, comprising, in addition, a coating or topcoat based on a rubber cement in a solvent.

11. Yarn according to claim 10, wherein the coating or topcoat based on a rubber cement in a solvent comprises carbon nanotubes.

12. An article based on a rubber material, reinforced with a yarn according to claim 8.

13. An article according to claim 12, wherein the article is selected from the group consisting of a belt, a tube, a hose, a pipe and a tire.

14. Process for preparing the RFL film or adhesive dip coating according to claim 1, comprising:

a step of preparing an RFL composition;

a step of preparing a dispersion of carbon nanotubes;

a step of mixing, by introducing the dispersion into the composition, in order to obtain a suspension; and

finally, a step of coating, impregnating or depositing the suspension obtained after mixing onto a yarn.

15. Process according to claim 14, wherein in the RFL composition a fraction of resorcinol-formaldehyde resin represents from 2 to 30% by dry weight and a fraction of latex represents from 70 to 98% by dry weight.

16. Process according to claim 14, wherein the step of mixing by introducing the dispersion into the composition, in order to obtain a suspension, is carried out under gentle stirring, using a stirrer that causes a shear rate of less than 300 rpm.

17. Process according to claim 14, wherein the dispersion includes a mixture of water with one or more surfactant compounds.

18. Process according to claim 14, wherein the step of coating, impregnating or depositing the suspension obtained after mixing onto a yarn comprises a splaying step in order to individually impregnate the constituent fibers of the yarn.

19. Process according to claim 18, wherein the step of coating, impregnating or depositing the suspension obtained after mixing onto a yarn is followed by a step of drying and/or crosslinking.

20. Process according to claim 19, further comprising, after the impregnation step, and before the drying step, a step of sizing the coating.

21. Process according to claim 18, further comprising a step of impregnating the yarn, in an adhesive in a solvent medium.

22. A longitudinal reinforcing element comprising a plurality of yarns according to claim 8, configured to be incorporated into an article based on a rubber material.