NIR-Reflective Pigment Tinting System for Dark Coatings
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Solution Overview
Problem
Existing tinting systems fail to produce dark colors in a satisfactory and reproducible manner, particularly for facade paints, leading to temperature increases on exterior surfaces when exposed to sunlight, which can cause cracking in thermal insulation composite systems.
Innovation Solution
A kit-of-parts tinting system comprising a tinting base composition with NIR-reflective or NIR-transparent black pigments and a color composition containing pigments and additives, allowing for the adjustment of paint and plaster systems to achieve high Total Solar Reflectance (TSR) values without significant temperature rise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional tinting systems are used to produce dark colors, then color depth and saturation are improved, but surface temperature increases significantly when exposed to sunlight
Solution Approach 1:
The patent applies composite materials by combining conventional color pigments with NIR-reflective pigments in a single coating composition. This composite approach allows the coating to maintain dark color appearance in the visible spectrum while reflecting near-infrared radiation, thus achieving both color depth and temperature control simultaneously
Solution Approach 2:
The patent utilizes color changes by selecting pigments that have different optical properties in different spectral ranges. The coating appears dark in the visible spectrum (400-700 nm) for aesthetic purposes but reflects NIR radiation (700-2500 nm) to reduce heat absorption, effectively using color properties selectively across different wavelength ranges
2Adaptability or versatility
If conventional tinting systems are used for facade paints, then color variety is improved, but reliability of the coating system deteriorates due to cracking in thermal insulation composite systems
Solution Approach 1:
The patent applies parameter changes by modifying the optical parameters of the coating through the addition of NIR-reflective pigments. This changes the coating's interaction with solar radiation, reducing heat absorption while maintaining color variety, thereby preventing thermal stress and cracking in the coating system
3Temperature
If NIR pigments are incorporated in dark-colored paint systems, then surface temperature reduction is improved, but manufacturing complexity increases
Solution Approach 1:
The patent merges the functions of color pigmentation and NIR reflection into a single integrated coating composition. By combining conventional color pigments with NIR-reflective pigments in one formulation, the system simplifies the tinting process while achieving both aesthetic and thermal performance goals
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 system enables the reliable and cost-effective production of dark-colored coatings and plasters with high TSR values, reducing surface temperature and preventing cracking, while maintaining color properties and depth.
Implementation Method 1
a) at least one, in particular exactly one, tinting base composition (also called tinting base) consisting of at least one NIR-reflecting black pigment and/or at least one NIR-transparent black pigment or an NIR-reflecting and/or NIR-transparent black pigment mixture
Implementation Method 2
a) at least one, in particular exactly one, tinting base composition (also called tinting base) consisting of at least one NIR-reflecting black pigment and/or at least one NIR-transparent black pigment or an NIR-reflecting and/or NIR-transparent black pigment mixture
Implementation Method 3
The incorporation of NIR pigments in dark-colored paint systems can noticeably reduce the temperature rise on the surface of an external facade when exposed to sunlight. Sunlight that reaches the earth's surface as radiation can essentially be divided into three sub-areas: approx. 3% of the energy arriving on the surface covers the UV spectral range (295-400 nm), almost 39% the visual range (400 -700 nm) and about 58% the NIR range (700-2500 nm)
Data Source
AI summary
The present invention relates to a kit-of-parts tinting system for color adjustment of paint and plaster systems, comprising a) at least one, in particular exactly one, tinting base composition, consisting of or containing at least one NIR-reflective black pigment and/or at least one NIR-transparent black pigment or an NIR-reflective and/or NTR-transparent black pigment mixture, and a base composition, consisting of or containing at least one binder and optionally at least one first solvent and optionally at least one first additive, and b) at least one color composition, preferably a plurality of color compositions, consisting of or containing at least one colored and/or achromatic pigment, at least one second additive, in particular a wetting and dispersing agent, and at least one second solvent.Furthermore, the invention relates to the use of the tinting system according to the invention for the production of tinted paint or plaster systems and these tinted paint and plaster systems. The invention also relates to a paint and a plaster obtainable by applying the tinted paint or plaster system according to the invention. The invention further relates to a method for tinting a color composition.