Multi-Metal Metallazo Pigments for Color Strength
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Solution Overview
Problem
Existing metallazo pigments based on azobarbituric acid, nickel, and zinc with melamine derivatives require further improvement in application characteristics, particularly in terms of color strength and dispersibility, which are essential for applications in plastics, paints, and LCD color filters.
Innovation Solution
Development of metallazo pigments containing at least three metallazo compounds with different metal types, including Ni2+, Zn2+, and additional metal ions like Cu2+, Al3+, Fe2+, Fe3+, Co2+, and Co3+, in specific molar ratios, along with melamine or its derivatives, to enhance color strength and dispersibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metallazo pigments are prepared with nickel and zinc salts and melamine derivatives, then the pigments can be used as yellow component in color filters and paints, but the application characteristics such as color strength and dispersibility require further improvement
Solution Approach 1:
The patent applies parameter changes by modifying the metal composition ratios (Ni:Zn:Me in various ranges), adjusting melamine derivative content (0.1-10 mol per mole of structural units), and controlling particle size through tempering temperature (60-150°C for 1-48 hours) to optimize both color strength and dispersibility simultaneously
Solution Approach 2:
The patent creates composite metallazo pigments containing at least three different metal types (Ni, Zn, and at least one additional metal from Cu, Al, Fe, Co, Mn, Cr, or Ti) combined with melamine derivatives, forming a multi-component composite structure that achieves improved application characteristics beyond what single-metal pigments can provide
2Ease of operation
If the concentration of coating agent is increased to reduce dispersion hardness, then the dispersion properties of the pigment are improved, but the color strength of the pigment is reduced
Solution Approach 1:
The patent changes the fundamental parameters of the pigment core structure itself rather than relying on coating agents. By optimizing the metal ratio (Ni:Zn:Me), melamine content, and particle size through controlled tempering, the pigment achieves inherent good dispersibility without requiring high concentrations of coating agents that would compromise color strength
3Adaptability or versatility
If the particle size of the pigments is changed through tempering, then the specific surface area is adjusted for better application properties, but the color strength may be affected
Solution Approach 1:
The patent optimizes particle size through controlled tempering at 60-150°C for 1-48 hours to achieve a specific surface area of 0.5-10 m²/g, which provides good application properties while maintaining color strength. This controlled parameter change allows simultaneous optimization of both dispersibility and color intensity
Data Source
AI summary
The new yellow metal azo pigments based on at least three metal azo compounds that differ from each other at least in the type of metal, have improved color strengths and are ideally suited for the pigmentation of pigment preparations for a wide range of applications.