Metal azo pigments
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing metal azo pigments based on azobarbituric acid and nickel salts require improvement in dispersion properties and color intensity, which are compromised by methods used to enhance dispersibility.
Innovation Solution
Development of metal azo pigments comprising adducts of metal azo compounds with specific metal ions such as Ni2+, Cu2+, Zn2+, Al3+, Fe2+, Fe3+, Co2+, and Co3+, combined with melamine, offering improved dispersion properties and increased color intensity through controlled molar ratios and heat treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If controlled surface coverage with covering agent is applied to improve dispersion properties, then dispersion hardness is lowered, but color intensity is reduced
Solution Approach 1:
The patent introduces a novel parameter - the ratio of nickel to copper content in the metal azo pigment - to resolve the contradiction. By adjusting the metal composition (Ni/Cu ratio) while maintaining controlled surface coverage, the invention achieves both improved dispersion properties and preserved color intensity, breaking the traditional trade-off between these two properties.
2Manufacturing precision
If heat treatment is applied to alter particle size and specific surface area, then performance-based properties are adjusted, but the process complexity increases
Solution Approach 1:
The patent applies heat treatment as a preliminary action during the pigment production process to control particle size and specific surface area before the pigment is applied. This preliminary control of physical parameters allows for optimized performance properties without requiring complex post-processing steps, thereby managing process complexity while achieving precise particle characteristics.
Data Source
AI summary
Yellow metal azo pigments based on adducts of at least two metal azo compounds provide improved dispersion properties and are of excellent suitability for pigmentation of pigment preparations for a broad field of use.