NIR Transparent Black Perylene Solid Solutions for Coatings
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional carbon black pigments used in coatings absorb near-infrared radiation, leading to increased temperatures and interference with LiDAR signals, and existing perylene-based pigments have poor coloristic performance and are difficult to produce conventionally.
Innovation Solution
A solid solution comprising specific perylene-based compounds that form a near-infrared transparent black pigment with improved coloristic properties, achieved through a process involving the reaction of perylene-3,4:9,10-tetracarboxylic acid derivatives with organic bases and nitrogen-containing compounds, resulting in a stable crystal structure that minimizes NIR absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If traditional carbon black pigments are used to achieve black color in coatings, then aesthetic appearance is improved, but near-infrared radiation absorption increases leading to temperature rise and LiDAR signal interference
Solution Approach 1:
The patent changes the chemical composition parameters by using perylene-based compounds with specific molecular structures (formulas I, II, III) that have different optical properties from traditional carbon black. These compounds are designed to absorb visible light for black color while being transparent to NIR radiation, thus changing the absorption spectrum parameters to resolve the contradiction between aesthetic appearance and NIR transparency.
Solution Approach 2:
The patent creates composite pigment systems using combinations of perylene-based compounds (formulas I, II, and III) to achieve the desired black color with NIR transparency. The composite structure of these organic pigments provides both the aesthetic black appearance and the functional NIR transparency, resolving the contradiction by combining multiple chemical components with complementary properties.
2Object-affected harmful factors
If physical mixtures of perylene-based pigments are used to achieve NIR transparency, then LiDAR signal response is improved, but coloristic performance becomes inconsistent and highly dependent on dispersion conditions
Solution Approach 1:
The patent merges multiple perylene-based compound structures (formulas I, II, and III) into a unified solid solution system where the compounds work synergistically. This merging approach ensures that the desired coloristic properties and NIR transparency are achieved through the combined effect of the compounds in a defined ratio, reducing sensitivity to dispersion variations compared to simple physical mixtures.
Solution Approach 2:
The patent specifies precise compositional parameters for the perylene-based compounds, including the structural formulas and the ratio ranges (e.g., formula I at 1-90 wt%, formula II at 10-80 wt%, formula III at 10-80 wt%). By controlling these compositional parameters, the patent achieves consistent coloristic performance and NIR transparency that is less sensitive to dispersion conditions compared to physical mixtures.
3Ease of manufacture
If conventional high-temperature calcination processes are used to produce perylene pigments, then pigment formation is achieved, but the process requires inert gas atmosphere and cannot be used conventionally in organic pigments field
Solution Approach 1:
The patent changes the processing parameters by using lower temperature synthesis (e.g., 50-200°C) compared to conventional high-temperature calcination (typically >500°C). This parameter change allows the perylene-based pigments to be produced under milder conditions without requiring inert gas atmospheres or specialized high-temperature equipment, making the process compatible with conventional organic pigment manufacturing.
Solution Approach 2:
The patent replaces the high-temperature thermal processing mechanism with a chemical synthesis mechanism that occurs at lower temperatures. Instead of relying on thermal energy to form the pigment structure, the invention uses chemical reactions (e.g., condensation reactions between perylene-3,4:9,10-tetracarboxylic acid and aromatic diamines) to build the pigment molecules, thereby substituting thermal processing with chemical synthesis.
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 near-infrared transparent black pigment with consistent coloristic performance across concentrations, reduced temperature increase, and enhanced LiDAR signal response, suitable for coatings and LiDAR applications.
Implementation Method 1
dark colors, such as black are particularly desirable for aesthetic purposes... dark colored coatings have historically been susceptible to absorption of near-infrared radiation... The present invention relates to a solid solution comprising at least one compound according to formula (I) and at least one compound according to formula (II)... as a near-infrared (NIR) transparent black colorant
Implementation Method 2
Near-infrared (NIR) transparent or reflective functional black pigments deliver superior signal response thereby improving object detection
Data Source
AI summary
The present invention relates to a solid solution comprising (a) at least one compound according to formula (I) and (b) at least one compound according to formula (II), or at least one compound according to formula (III), or a mixture of at least one compound according to formula (II) and at least one compound according to formula (III) wherein R1 and R2 may, independently of one another, stand for —(CH2)n—X, wherein X stands for hydrogen, methyl, a C1-C5 alkoxyl, hydroxy, phenyl, C1-C5 alkylphenyl, C1-C5 alkoxyphenyl, hydroxyphenyl, halogenated phenyl, pyridyl, C1-C5 alkylpyridyl, C1-C5 alkoxypyridyl, halogenated pyridyl, pyridylvinyl or naphthyl; wherein n stands for 0, 1, 2, 3, 4 or 5; R3 and R4 may, independently of one another, stand for phenylene, C1-C5 alkylphenylene, C1-C5 alkoxyphenylene, hydroxyphenylene, halogenated phenylene, pyridinediyl, C1-C5 alkylpyridinediyl, C1-C5 alkoxy-pyridinediyl, halogenated pyridinediyl, anthraquinonediyl or naphthalenediyl, wherein the 2 nitrogen atoms bound to R4 according to formula (II) and (III) form a 5-membered or a 6-membered heterocycle with 2 atoms of an aromatic ring of R3; wherein the 2 nitrogen atoms bound to R4 according to formula (II) and (III) form a 5-membered or a 6-membered heterocycle with 2 atoms of an aromatic ring of R4; X1 to X8 may, independently from one another, stand for hydrogen, C1-C5 alkyl, C1-C5 alkoxy, hydroxy, phenyl or halide. The present invention further relates to a process for producing the solid solution. Furthermore, the present invention relates to a solid solution obtainable or obtained according to said process and to the use of the inventive solid solution, in particular as a NIR transparent black colorant in a NIR non-absorbing component.