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Home / News / Industry News / Pigments Hard to Disperse in Epoxy Systems? Choosing the Right Dispersant Is Critical
Industry News
Epoxy Systems
Industrial Coatings
Carbon Black
Organic Pigments
DH-6200
In epoxy resins and high-performance industrial coatings, carbon black and organic pigments have large specific surface areas and a strong tendency to agglomerate. If dispersion is insufficient, not only is colour development affected — grinding time also increases, production efficiency decreases, and the storage stability of the colour paste is compromised. Selecting a dispersant suitable for epoxy systems is therefore an important step in improving pigment dispersion performance and product quality.
Without Effective Dispersant
Carbon black and organic pigments agglomerate — grinding difficulty is high and production cycles are long
Insufficient colour development — colour appears dark, tinting strength is inadequate
Poor colour paste storage stability — re-coarsening, settling, or separation after storage
Limited formulation applicability — insufficient compatibility across different resin systems
With DH-6200
Improved pigment wetting and dispersion efficiency — reduced grinding time and production cost
Better colour development — improved tinting strength, colour brightness, and visual uniformity
More stable colour paste — reduced settling, re-coarsening, and separation tendency
Broad formulation compatibility across epoxy, polyol, unsaturated resin, and ink systems
Why Longer Grinding Alone Is Not the Answer
Increasing grinding time or mechanical shear can improve dispersion to some degree, but readily increases energy consumption and production cost, and the improvement for high-surface-area carbon black is often limited. By contrast, using a wetting dispersant to reduce pigment agglomeration and improve de-flocculation efficiency is more effective at improving grinding efficiency and colour paste stability.
DH-6200: Dispersant for Epoxy Systems and Industrial Coatings
DH-6200 is a dispersant suitable for epoxy systems and a variety of industrial coatings, applicable for grinding and dispersion of carbon black, organic pigments, and colour pastes. It is suitable for polyether/polyester polyol colour pastes, unsaturated resin colour pastes, and solvent-free epoxy systems. It is also widely applicable in plastic coatings, wood coatings, floor coatings, coil coatings, and other industrial coating systems, as well as various inks — particularly well-suited for alcohol-water polyurethane ink systems.
Epoxy Systems
Polyether/polyester polyol colour paste, unsaturated resin colour paste, solvent-free epoxy
Industrial Coatings
Plastic coatings, wood coatings, floor coatings, coil coatings and other high-performance industrial systems
Inks
Various ink systems — especially suited for alcohol-water polyurethane ink formulations
Carbon Black & Organics
Specifically effective for high-surface-area carbon black and difficult-to-disperse organic pigments
For epoxy systems and high-performance industrial coatings, excellent pigment dispersion is an important foundation for achieving quality colour pastes. Selecting a dispersant appropriately not only improves grinding efficiency and colour development performance but also enhances colour paste storage stability — providing a more reliable dispersion solution for industrial coatings and ink systems.
Frequently Asked Questions
Why is carbon black particularly difficult to disperse in epoxy systems?
Carbon black has an extremely high specific surface area — typically 20 to 1,500 m²/g depending on grade — and strong inter-particle van der Waals attraction due to this high surface area. In the high-viscosity environment of an epoxy base, mechanical shear alone is often insufficient to break down and stabilise the carbon black aggregates. A dispersant that adsorbs strongly to the carbon black surface and provides steric stabilisation is the more effective approach.
Can DH-6200 be used in both Part A and Part B of a two-component epoxy system?
DH-6200 is typically incorporated in the pigment-containing component (Part A) during the colour paste grinding stage. Whether it is compatible with the hardener component (Part B) depends on the specific system — a compatibility check before production use is recommended if there is a requirement to add dispersant to the hardener side.
