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EP-4355830-B1 - COATING COMPOSITIONS, METHODS OF MAKING AND USING SAME

EP4355830B1EP 4355830 B1EP4355830 B1EP 4355830B1EP-4355830-B1

Inventors

  • LAUX, Joseph, John
  • SALVAGGIO, David
  • PILETTE, Thomas, Mark
  • JOHNSON, ERIK

Dates

Publication Date
20260513
Application Date
20220621

Claims (15)

  1. A coating composition comprising graphene having an aspect ratio between 2000 and 15000, a ceramic film-forming agent, a UV absorber and a hindered amine light stabilizer (HALS) in a liquid, wherein the graphene comprises graphene nanoplatelets (GNPs), graphene oxide nanoplatelets (GNOPs), or a combination thereof, the UV absorber has a structure based on triazine, benzophenone or benzotriazole, and the ceramic film-forming agent comprises a reactive silicone polymer.
  2. The coating composition of claim 1, wherein the ceramic film-forming agent is an organosilane that is a polysiloxane precursor.
  3. The coating composition of any preceding claim, wherein organosilane comprises an organosilane quaternary ammonium compound.
  4. The coating composition of claim 3, wherein the organosilane quaternary ammonium compound has the following formula: wherein R 1 =hydrogen and/or C 1 to C 4 alkyl; R 2 =divalent hydrocarbon with C 1 to C 8 carbon atoms; R 3 =hydrogen or C 1 to C 4 alkyl; R 4 =hydrogen or C 1 to C 10 alkyl; R 5 =C 8 to C 22 saturated or unsaturated hydrocarbon radical and X=halide.
  5. The coating composition according to any one of the preceding claims, wherein the UV-absorber is present in an amount of 0.01 to 2 wt.-%, 0.05 to 2 wt.-%, 0.05 to 1.5 wt.-%, 0.05 to 1 wt.-%, 0.1 to 1 wt.-%, 0.1 to 2 wt.-%, 0.1 to 1.5 wt.-%, 0.5 to 1.5 wt.-%, or 0.5 to 2 wt% based on the total weight of the coating composition.
  6. The coating composition of any preceding claim, wherein the graphene comprises GNPs.
  7. The coating composition of any preceding claim, wherein the graphene is present in an amount of about 0.001 to 5 wt.-%, 0.002 to 4.5 wt.-%, 0.005 to 4 wt.-%, 0.01 to 3.5 wt.-%, 0.05 to 3 wt.-%, 0.1 to 2.5, 0.1 to 1 wt.-%, 0.25 to 2 wt.-%, for example, 0.02 to 0.20 wt.-%, 0.03 to 0.15 wt.-%, or 0.4 to 0.15 wt.-% based on the total weight of the coating composition.
  8. The coating composition of any preceding claim, wherein the HALS is present in an amount of about 0.05 to 5 wt.-%, 0.05 to 4 wt.-%, 0.05 to 3 wt.-%, 0.05 to 2 wt.-%, 0.05 to 1 wt.-%, 0.1 to 1 wt.-%, 0.1 to 2 wt.-%, 0.1 to 5 wt.-%, 0.5 to 1.5 wt.-%, or 0.5 to 2.5 wt%, based on the total weight of the coating composition.
  9. The coating composition of any preceding claim further comprising an additive selected from the group consisting of a blue colorant, titanium dioxide, a near-infrared (NIR) reflective polymer, a dispersant, a surfactant, and any combination thereof.
  10. The coating composition of claim 9, wherein coating composition comprises the blue colorant.
  11. The coating composition of any preceding claim, wherein the coating composition is a dispersion of graphene in a single-phase liquid, the single-phase liquid comprising an aqueous solvent system or an organic solvent system.
  12. The coating composition of any of claims 1-11, wherein the coating composition is a dispersion of graphene in a multi-phase system of two or more immiscible liquids, the two or more liquids comprising an aqueous phase and an organic phase.
  13. A carbon-fiber automobile body surface treated with the composition of any one of claims 1-12.
  14. A vinyl automobile body wrap surface treated with the composition of any one of claims 1-12.
  15. A method of surface treating an vehicle body comprising applying a layer of the coating composition of any one of claims 1-12 to a surface of the vehicle body to provide a coating.

Description

FIELD OF INVENTION Coating compositions for protecting and enhancing previously applied coatings are described. More particularly, coating compositions that are dispersions comprising graphene and a hindered amine light stabilizer (HALS) are described. Methods of treating a surface, particularly a vehicle surface (e.g., a carbon-fiber automobile body surface, a vinyl wrapped carbon-fiber automobile body surface, and fiber glass panels), including applying the foregoing coating compositions are also described. BACKGROUND OF INVENTION Original equipment manufacturers (OEM) use many different types of materials to combine aesthetics, safety, weight, and durability characteristics. For example, vehicle exteriors may be manufactured from a combination of traditional materials, such as metals, metal alloys, rubbers, polymers (e.g. vinyl), fiber glass, with newer materials, such as carbon fibers and new polymer materials. Many automotive and household products such as automobiles, boats, luggage, and outdoor furniture include surfaces comprising fiber-reinforced polymer materials. In particular, vehicle exteriors, particularly for premium vehicles, are commonly manufactured from fiber-reinforced polymer materials because fiber based composite materials, particularly carbon-fiber based materials, are able to provide exceptional structural performance while achieving significant weight savings, thereby allowing significant increases in vehicle performance. Environmental factors such as heat, ultra-violet light, ozone, and dirt can prematurely age and damage these materials. In particular, yellowing of carbon-fiber based polymer composite materials is a well-known issue that can cause the appearance of premium vehicles to become less attractive over time. As a result, protection products have been developed to clean, preserve, and protect metal, carbon-fiber containing-, fiber glass containing-, rubber, plastic, and vinyl surfaces against the harmful effects of the environment, and even to improve the appearance of these surfaces. Conventional protection products often include different types of waxes, e.g., carnauba wax. While waxes provide some protection from UV-light induced degradation, that protection is typically short-lived. Moreover, these products are often difficult to apply and/or require significant effort removal of residues after application. Sealant-type protection products typically last longer and can be relatively easier to apply. Currently available sealant-type protection products are generally provided as liquids which are sprayed onto a surface. Such sprayable liquid protection products often exhibit poor coverage characteristics and result in significant losses from overspray. Representative commercially available prior art sealant product may include a reactive silane in a solvent system to form a protective coating as the product is applied. CN112300641 discloses a self-cleaning coating for aluminum alloy doors and windows and a preparation method thereof. CN109679474 discloses a low-viscosity polyurethane material for wind power blades. CN109627933 discloses an automobile coating and a processing technology thereof. WO2020/167626 discloses methods of making multilayer systems comprising a sealant layer by extruding a coreactive sealant composition. SUMMARY Provided herein are coating compositions according to claim 1. The coating compositions can be either dispersions of graphene in a single-phase liquid or dispersions of solid graphene in a multi-phase system of two or more immiscible liquids. In certain refinements, the dispersion comprises a liquid, a hindered amine light stabilizer (HALS) dissolved and/or dispersed in the liquid, and graphene dispersed in the liquid, wherein the liquid is a single-phase liquid. The single-phase liquid may comprise an aqueous solvent system or an organic solvent system. The graphene comprises graphene nanoplatelets (GNPs), graphene oxide nanoplatelets (GNOPs), or a combination thereof. In certain refinements, the dispersion is an emulsion having an aqueous phase and an organic phase, and the graphene is present in either the aqueous phase, the organic phase, or in both the aqueous phase and the organic phase. Similarly, the HALS may be present in either the aqueous phase, the organic phase, or in the aqueous phase and the organic phase. The aqueous phase includes an aqueous solvent and the organic phase includes an organic solvent. The graphene comprises graphene nanoplatelets (GNPs), solid graphene oxide nanoplatelets (GNOPs), or a combination thereof. Also provided are kits for coating a surface comprising a coating composition of the disclosure. The kit may comprise a container of the coating composition of the present disclosure, and an applicator, for example, a microfiber towel or a "block" applicator or a foam applicator. Also provided are carbon-fiber automobile panels comprising surfaces treated with a coating composition of the disclosure. Viny