Amine Silane Fatty Acid Coating Corrosion UV Stability
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Solution Overview
Problem
Existing clear or translucent emissive coatings for metallic surfaces, particularly aluminum-containing surfaces like Galvalume®, fail to meet high requirements for anti-corrosion and anti-UV degradation, leading to reduced reflectance and loss of clarity over time.
Innovation Solution
A composition comprising 50 to 300 g/l of clear organic polymeric substances, 30 to 300 g/l of sheet silicate pigments with specific particle size distribution, and a reaction product of amine-functionalized organosilane and fatty acid, which forms a clear film and enhances coating strength, preventing corrosive chemical access and improving durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If clear or translucent emissive coatings are applied on aluminum-containing surfaces, then solar reflectance and thermal emissivity are improved, but anti-corrosion and anti-UV degradation properties deteriorate
Solution Approach 1:
The patent applies a pretreatment composition containing zinc compound and silane compound to the aluminum-containing surface before applying the clear emissive coating. This preliminary action creates a corrosion-resistant and UV-stable foundation layer that prevents the coating from degrading over time, while maintaining the coating's optical properties for solar reflectance and thermal emissivity
Solution Approach 2:
The patent uses a composite coating system consisting of multiple layers: a pretreatment layer with zinc and silane compounds, and a clear emissive coating layer with specific polymers and pigments. This composite structure combines the corrosion resistance of zinc-silane with the optical performance of the clear coating, resolving the contradiction between durability and energy efficiency
2Loss of energy
If clear or translucent emissive coatings are applied on aluminum-containing surfaces, then thermal emissivity is improved, but coating clarity is lost over time due to discoloration
Solution Approach 1:
The pretreatment composition with zinc compound and silane compound is applied before the clear emissive coating to create a stable base layer that prevents UV-induced discoloration. This preliminary protection allows the clear coating to maintain its transparency and optical clarity while still providing high thermal emissivity
Solution Approach 2:
The patent specifies precise compositional parameters for the clear emissive coating, including polymer types (polyester, acrylic, vinyl), pigment concentrations (0.1-10% by weight), and coating thickness (5-50 micrometers). These controlled parameters ensure the coating maintains both high thermal emissivity and long-term clarity without discoloration
3Shape
If clear emissive coatings are applied to maintain surface structure visibility, then aesthetic appearance is improved, but corrosion protection is insufficient
Solution Approach 1:
The pretreatment composition containing zinc compound and silane compound is applied to the aluminum-containing surface before the clear emissive coating. This creates a corrosion-resistant barrier that protects the underlying metal while allowing the clear coating above to maintain surface structure visibility and aesthetic appearance
Solution Approach 2:
The zinc-silane pretreatment layer acts as an intermediary between the aluminum-containing substrate and the clear emissive coating. It provides corrosion protection to the metal substrate while allowing the clear coating to perform its aesthetic and thermal functions without being compromised by corrosion
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a clear, translucent emissive coating with improved anti-corrosion and anti-UV degradation properties, meeting stringent requirements such as <5% rust in NSS tests and maintaining clarity and performance over 1000 hours, while reducing discoloration under sunlight exposure.
Implementation Method 1
the reaction product of at least one amine-functionalized organosilane and/or oligomer and/or polymer thereof and at least one fatty acid, wherein the at least one amine-functionalized organosilane and/or oligomer and/or polymer thereof is linked to the at least one fatty acid by at least one carboxylic acid/amine salt bond and/or by at least one amide bond
Implementation Method 2
Emissive coatings show a reduced absorption of electromagnetic radiation. They are seeked to reduce the amount of heat transfer from solar irradiance by absorption to transmission and to increase the amount of heat to be reflected
Implementation Method 3
thermal emissivity of energy which is initially absorbed and not reflected and then radiated
Implementation Method 4
thermal resistance to resist the flow of heat into the interior
Data Source
AI summary
Disclosed is a composition for applying a clear or translucent emissive coating on an aluminum containing surface. The composition includes, in a dispersion, 50 to 300 g/l of at least one of clear or translucent organic polymeric substances of a binder, and 30 to 300 g/l of sheet silicate pigments having a TE value for the thermal emissivity of at least 0.40, having a particle size distribution of which d50 is in the range of 0.3 to 80 μm and having been comminuted, disintegrated, exfoliated or any combination of these to thin particles. The composition additionally includes the reaction product of at least one aminefunctionalized organosilane and/or oligomer and/or polymer thereof and at least one fatty acid. The molar ratio of the amino group/s of the at least one amine-functionalized organosilane and/or oligomer and/or polymer thereof and of the at least one fatty acid is 1.2:1 to 1:2.