Polyetheramine-Coated Oxidized Carbon Black for Coating Dispersion
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Solution Overview
Problem
Current coating formulations using carbon black pigments face challenges with long dispersion times and high viscosity due to the use of polymeric dispersants, which hinder the efficient dispersion of carbon black in solvent-based coatings, especially for high-surface-area and small-particle-size carbon blacks, affecting color and hiding power.
Innovation Solution
Oxidized carbon blacks treated with polyetheramines, specifically those with a BET surface area of 50-700 m^2/g, DBP oil adsorption of 50-200 mL/100g, and primary particle size of 7-30 nm, are coated with polyetheramines comprising ethylene oxide and propylene oxide monomers, improving dispersibility and reducing the need for high amounts of dispersants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If polymeric dispersants are used to improve carbon black dispersibility, then dispersibility is improved, but viscosity increases and drying time increases
Solution Approach 1:
The patent changes the chemical parameters of the dispersant by using polyether amines with specific molecular weights (500-10,000) and specific structural characteristics (ethylene oxide and propylene oxide ratios) instead of conventional high molecular weight polymeric dispersants. This parameter change achieves improved dispersibility while controlling viscosity.
Solution Approach 2:
The invention creates a composite structure where polyether amine molecules combine hydrophilic ether groups and hydrophobic amine groups, forming an amphiphilic dispersant system that effectively bridges the hydrophobic carbon black particles and the aqueous or solvent-based coating medium, achieving stable dispersion without excessive viscosity increase.
2Stability of the object's composition
If polymeric dispersants are used to improve carbon black dispersibility, then dispersibility is improved, but drying time increases
Solution Approach 1:
The patent changes the molecular weight parameter of the dispersant to a lower range (500-10,000) compared to conventional polymeric dispersants, which reduces the drying time while maintaining effective dispersibility through optimized polyether amine structure.
3Manufacturing precision
If high surface area carbon black with small particle size is used to improve color strength, then color development is improved, but dispersion time increases
Solution Approach 1:
The patent applies preliminary surface oxidation treatment to the carbon black particles before incorporating them into the coating composition. This preliminary action modifies the surface chemistry to be more compatible with polyether amine dispersants, enabling faster dispersion of high-surface-area, small-particle-size carbon black without sacrificing color development.
Solution Approach 2:
The invention optimizes the particle size parameter to 7-30 nm and surface area to 50-700 m²/g in combination with polyether amine treatment, achieving a balance where high color strength is maintained while dispersion time is significantly reduced through improved surface compatibility.
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 use of polyetheramine-treated oxidized carbon blacks enhances the dispersion efficiency, reduces milling time, and improves color development and hiding power in coatings, while minimizing the amount of dispersant required, leading to cost-effective and high-performance coating formulations.
Implementation Method 1
an oxidized carbon black having a BET surface area ranging from 50 to 700 m2/g wherein a polyetheramine coats the oxidized carbon black
Implementation Method 2
improving dispersibility and reducing the need for high amounts of dispersants
Data Source
AI summary
Disclosed herein are materials and compositions comprising: an oxidized carbon black having a BET surface area ranging from 50 to 700 m2/g, a DBP oil adsorption number ranging from 50 to 200 mL/100 g, and a primary particle size ranging from 7 to 30 nm; and a polyetheramine comprising ethylene oxide and propylene oxide monomers, wherein the polyetheramine coats the oxidized carbon black. Also disclosed are coatings and coating compositions comprising these materials and methods of making the same.