Graphene HALS Coating Composition for UV-Stable Vehicle Surfaces
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Solution Overview
Problem
Conventional protection products for vehicle surfaces, particularly those made of carbon-fiber based materials, suffer from poor UV protection, short-lived effectiveness, and application difficulties, leading to premature aging and unsightly yellowing.
Innovation Solution
A coating composition comprising graphene and a hindered amine light stabilizer (HALS) is applied as a dispersion in a single-phase or multi-phase liquid system, providing a protective coating that enhances UV protection and durability, with graphene nanoplatelets dispersed in an aqueous or organic solvent system, optionally with a ceramic film-forming agent and NIR reflective polymer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional coating materials (acrylics, vinyls, epoxies, polyesters) are used, then color variety and aesthetic appeal are achieved, but resistance to biological growth (mold, mildew, algae) is insufficient
Solution Approach 1:
The patent combines conventional organic coating materials (acrylics, vinyls, epoxies, or polyesters) with inorganic biocidal materials (such as zinc oxide, zinc carbonate, zinc stearate, calcium carbonate, titanium dioxide, or barium sulfate) to create a composite coating composition. This composite structure provides both the aesthetic properties of organic coatings and the biological growth resistance of inorganic biocides, resolving the contradiction between color variety and biological resistance.
Solution Approach 2:
The patent incorporates biocidal materials specifically at the interface between the coating and the substrate surface, where biological growth occurs. The inorganic particles are distributed within the coating matrix to provide localized biocidal activity at the critical interface region, while the organic binder provides overall coating continuity and aesthetic properties.
2Duration of action of stationary object
If inorganic coating materials are used, then durability and UV resistance are improved, but application properties and aesthetic appeal are reduced
Solution Approach 1:
The patent creates a composite coating system where inorganic biocidal materials provide durability and UV resistance, while organic polymer binders (acrylics, vinyls, epoxies, or polyesters) provide good application properties including flow, leveling, and adhesion. The synergistic combination allows the coating to exhibit both the durability of inorganic materials and the ease of application of organic materials.
Solution Approach 2:
The organic polymer binder acts as an intermediary that facilitates the application and distribution of inorganic biocidal particles. The binder provides a suitable vehicle for applying the inorganic materials, ensuring proper flow and adhesion during application, while the inorganic particles provide the desired durability and biocidal properties after curing.
3Reliability
If traditional biocides (organometallic compounds, organotins, organic mercury) are used, then biological growth resistance is achieved, but environmental safety and non-toxicity are compromised
Solution Approach 1:
The patent changes the chemical nature of biocidal materials from toxic organic compounds to safe inorganic materials. Specifically, it uses inorganic zinc compounds (zinc oxide, zinc carbonate, zinc stearate) and other non-toxic inorganic particles that provide biocidal activity through physical mechanisms such as UV generation and cell membrane disruption, rather than through toxic chemical reactions. This parameter change eliminates environmental toxicity while maintaining biological growth resistance.
Solution Approach 2:
The patent converts potentially harmful substances into beneficial ones by replacing toxic traditional biocides with safe inorganic materials. The inorganic biocidal materials provide the same protective function against mold and mildew growth but without the harmful environmental effects, effectively turning a harmful requirement (biocidal activity) into a safe solution.
4Shape
If organic coating materials are used, then aesthetic appeal and color variety are achieved, but UV resistance and durability are reduced
Solution Approach 1:
The patent combines organic coating materials that provide excellent color variety and aesthetic appeal with inorganic UV-resistant materials (such as titanium dioxide, zinc oxide, and other metal oxides). The inorganic particles absorb and scatter UV radiation, protecting the organic binder from degradation, while the organic matrix provides the desired color and finish. This composite structure simultaneously achieves both aesthetic appeal and UV resistance.
Solution Approach 2:
The inorganic UV-resistant particles act as intermediaries that intercept UV radiation before it can degrade the organic coating materials. These particles form a protective network within the organic matrix, absorbing harmful UV energy and converting it to harmless heat, thereby protecting the color and integrity of the organic binder while allowing the coating to maintain its aesthetic properties.
Data Source
AI summary
The disclosure relates to coating compositions. More particularly the disclosure relates to coating compositions including graphene and a hindered amine stabilizer (HALS). The compositions can be provided as a dispersion of graphene in a single liquid phase comprising the HALS, or as a dispersion of graphene in a multi-phase system of two or more immiscible liquids and comprising the HALS. The graphene includes graphene nanoplatelets (GNPs), graphene oxide nanoplatelets (GNOPs), or both.