UV-CURABLE, WEAR RESISTANT AND ANTISTATIC COATING FILLED WITH CARBON NANOTUBES

• US 20120010316A1
• Filed: 03/05/2010
• Published: 01/12/2012
• Est. Priority Date: 03/13/2009
• Status: Abandoned Application

• Current Assignee: Bayer Materialscience AG (Covestro AG)
• Original Assignee: Bayer Materialscience AG (Covestro AG)
• Inventors: Zhang, Zhong, Peng, Ke, Liu, Lu-Qi, Li, Hongchao, Bahnmueller, Stefan, Meyer, Helmut, Zhang, Hui, Hitzbleck, Julia
• Application Number:
  US13/255,921
• Publication Number:
  US 20120010316A1
• Time in Patent Office: Days
• US Class Current: 522/33
• CPC Class Codes: B82Y 30/00 Nanotechnology for materials or surface science, e.g. nanocomposites
• CPC Class Codes: B82Y 40/00 Manufacture or treatment of nanostructures
• CPC Class Codes: C01B 2202/36 Diameter
• CPC Class Codes: C01B 32/174 Derivatisation; Solubilisation; Dispersion in solvents
• CPC Class Codes: C08F 290/067 Polyurethanes; Polyureas
• CPC Class Codes: C08K 3/04 Carbon
• CPC Class Codes: C08K 3/041 Carbon nanotubes
• CPC Class Codes: C08L 33/08 Homopolymers or copolymers of acrylic acid esters
• CPC Class Codes: C09D 175/16 having terminal carbon-to-carbon unsaturated bonds
• CPC Class Codes: C09D 7/62 modified by treatment with other compounds
• CPC Class Codes: C09D 7/70 characterised by shape, e.g. fibres, flakes or microspheres

Abstract

A methodology is provided for making UV-curable, wear resistant and antistatic coating filled with carbon nanotubes (CNTs). The composition consists of a mixture of CNTs, an acrylate-based monomer, a urethane-acrylate oligomer and a photoinitiator. The present invention provides a coating of which the wear resistance and antistatic properties are dramatically improved in comparison with the polymer substrate. This coating is suitable for protecting a variety of polymer substrates from scratch and electrostatic accumulation.

Claims

1-19. -19. (canceled)

20. A coating composition comprising

A) a urethane-acrylate oligomer,

B) carbon nanotubes,

C) at least one acrylate-based monomer (as diluent and reactive component) and

D) a photoinitiator.

21. The composition according to claim 20, wherein at least a part of the carbon nanotubes B) comprise functional groups containing oxygen.

22. The composition according to claim 20, wherein at least a part of the carbon nanotubes B) comprise function oxygen containing functional groups which are obtained by oxidation of carbon nanotubes.

23. The composition according to claim 21, wherein the carbon nanotubes with oxygen containing functional groups are obtained by oxidation with a gas comprising ozone.

24. The composition according to claim 21, wherein the carbon nanotubes have been oxidized by simultaneous treatment with oxygen/ozone in the gas phase comprising the steps

(a) placing carbon nanotubes into a reaction zone

(b) passing a mixture of ozone, oxygen and water through the carbon nanotubes.

25. The composition according to claim 21, wherein the carbon nanotubes have been oxidized by applying a mixture of ozone, oxygen and water which is passed continuously through carbon nanotubes agglomerates.

26. The composition according to claim 24, wherein during the oxidation process of the carbon nanotubes the temperature in the reaction zone is kept below 200°

C.

27. The composition according to claim 24, wherein during the oxidation process of the carbon nanotubes the reaction time of ozonolysis of carbon nanotubes is up to 120 minutes.

28. The composition according to claim 24, wherein during the oxidation process of the carbon nanotubes the exposure of carbon nanotubes is carried out with an ozone and oxygen mixture which comprises from 1 vol.-% to about 11 vol.-% of ozone.

29. The composition according to claim 24, wherein during the oxidation process of the carbon nanotubes the flow rate of the mixture of ozone, oxygen and water is from about 100 l/hour to about 1000 l/hour per 1 g of carbon nanotubes.

30. The composition according to claim 24, wherein during the oxidation process of the carbon nanotubes the relative humidity of water vapour in the reaction zone is up to 100%.

31. The composition according to claim 20, wherein the coating composition comprises from 0.1 to 5% by weight of the composition of the carbon nanotubes.

32. The composition according to claim 20, wherein the urethane-acrylate oligomer A) is an aliphatic urethane acrylate oligomer.

33. The composition according to claim 20, wherein the composition comprises from 1% by weight to 80% by weight of the urethane-acrylate oligomer A), relative to the total weight of the total coating composition.

34. The composition according to claim 20, wherein the acrylate-based monomers C) are selected from the group consisting of dipropylene glycol diacrylate (DPGDA), tripropylene glycol diacrylate (TPGDA), triethylene glycol diacrylate (TEGDA), 1,6-hexanediol diacrylate (HDDA), pentaerythrite triacrylate (PETA), trimethylolpropane triacrylate (TMPTA), ethoxylated trimethylol propane triacrylate (TMPEOTA), propoxylated glycerol triacrylate (GPTA), ethoxylated glycerol triacrylate, dipentaerythritol hexaacrylate (DPHA) and combinations thereof.

35. The composition according to claim 20, wherein the composition comprises from 0.05% by weight to 10% by weight of the photoinitiator D), relative to the total weight of the total coating composition.

36. The composition according to claim 20, wherein the photoinitiator D) comprises a benzophenone or a substituted benzophenone, an acetophenone or a substituted acetonphenone, benzoin or its alkyl ester, a xanthone or a substituted xanthone, diethoxy-acetophenone, an aminoketone, a benzildimethyl-ketal, or mixtures thereof.

37. A substrate coated with a cured or an uncured composition according to claim 20.

38. A coating or film obtained from a cured composition according to claim 20.

39. A coatins for vehicles and building construction parts comprising the composition according to claim 20.