Solar Reflective Coating Composition for Aerospace Heat Management
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Solution Overview
Problem
Aerospace components face heat build-up due to solar radiation absorption, with pure white coatings requiring thick layers to hide the surface, leading to weight increases, and off-white or grey coatings using carbon black exacerbating the issue by absorbing radiation.
Innovation Solution
A solar reflective coating composition incorporating a film-forming resin, near-IR transparent perylene pigments, and a near-IR reflective pigment, which when cured, exhibits an off-white or grey color without carbon black, effectively reflecting solar radiation while maintaining a thin, lightweight layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If pure white coating composition is applied to prevent heat build-up, then solar radiation reflection is improved, but coating layer thickness must be increased to hide the substrate, resulting in weight increase
Solution Approach 1:
The invention changes the optical parameters of the coating by using specific pigment combinations (perylene pigments with near-IR transparency) that alter how the coating interacts with solar radiation. This allows the coating to achieve high solar reflectance with thinner layers, resolving the contradiction between heat prevention and weight reduction
Solution Approach 2:
The invention uses a composite pigment system combining perylene pigments (for visible color and near-IR transparency) with other pigments to create a multi-functional coating material. This composite approach enables simultaneous achievement of aesthetic appearance, solar reflection, and thin-film properties, avoiding the weight penalty of thick pure white coatings
2Illumination intensity
If off-white or grey coating composition with carbon black is applied to achieve aesthetic preference, then color appearance is improved, but solar radiation absorption increases, causing excessive heat build-up
Solution Approach 1:
The invention extracts carbon black from the pigment system and replaces it with perylene pigments that provide similar or superior color appearance without the harmful near-IR absorption. This extraction of the problematic component while retaining the desired aesthetic effect resolves the contradiction between color preference and heat prevention
Solution Approach 2:
The invention changes the color mechanism from carbon black-based absorption to perylene pigment-based selective reflection. The perylene pigments provide off-white or grey appearance through their optical properties while maintaining near-IR transparency, fundamentally changing how the color is achieved without the heat absorption penalty
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 coating composition significantly reduces heat absorption, achieving high solar reflectance with a thin layer, thereby minimizing weight increase and maintaining aesthetic preferences while enhancing fuel efficiency.
Implementation Method 1
a near-IR reflective pigment dispersed in the film-forming resin
Implementation Method 2
a plurality of near-IR transparent pigments dispersed in the film-forming resin
Data Source
AI summary
A solar reflective coating composition includes: a film-forming resin; a plurality of near-IR transparent pigments dispersed in the film-forming resin, the plurality of near-IR transparent pigments including a first perylene pigment and a second perylene pigment different from the first perylene pigment; and a near-IR reflective pigment dispersed in the film-forming resin, the near-IR reflective pigment different from the first perylene pigment and the second perylene pigment. When formed into a cured coating over a substrate, the cured coating exhibits an off-white or grey color. The solar reflective coating composition is substantially free of carbon black. The present invention is also directed to a substrate having a surface at least partially coated with a solar reflective coating composition and a method of preparing a low weight aerospace component.