Peers engaged in color masterbatch production and formula R&D are very familiar with dispersants. As core additives, they govern the coloring uniformity of masterbatches, finished product stability and downstream processing performance. Many practitioners know dispersants must be added yet cannot articulate their full working logic. Today we elaborate on the mechanism through the three stage pigment dispersion process????

1. Initial Wetting: Establish Compatibility Foundation between Pigment and Resin

Pigments frequently show poor compatibility with carrier resins due to their intrinsic surface properties, which readily causes agglomeration and poor blending. Dispersants first modify the physical surface properties of pigments to boost affinity and compatibility between pigments and resins. This enables pigments to be smoothly wetted and encapsulated by the resin matrix, laying a prerequisite foundation for subsequent dispersion.

2. Particle Refinement & Disintegration: Break Down Large Pigment Agglomerates

High intensity mechanical shear force is applied during masterbatch extrusion and grinding. Dispersants serve as performance boosters at this stage: they assist external force in overcoming cohesive forces among fine pigment particles, thoroughly disintegrate caked pigment agglomerates, refine particle size, and break large clumps into uniform fine particles.

3. Internal Wetting: Critical Factor for Shear-Force Transfer Efficiency

This is the most overlooked core step! Dispersants penetrate the pigment particle surfaces and the micro gaps between particles for in depth wetting, fully displacing trapped air inside pores to achieve thorough, all round pigment wetting.

Industry note: During dispersion processing, the transfer efficiency of mechanical shear largely depends on the degree of internal wetting. Insufficient wetting renders even intense mechanical force ineffective for satisfactory dispersion.

Summary

The performance of dispersants runs through the whole process of initial wetting → particle size refinement → internal wetting. It functions in three dimensions: optimizing interfacial compatibility, assisting mechanical disintegration of agglomerates, and improving shear force utilization efficiency. Consequently, pigments achieve long term stable, uniform and fine dispersion within the masterbatch system.

Bouni New Materials: Special Wax Recommendations for Color Masterbatch Dispersion

To achieve ideal pigment dispersion effects, selecting polyethylene wax matching your system is critical. Our company supplies a full range of cracked, refined and oxidized polyethylene waxes for various color masterbatches and pigment systems to meet diverse dispersion requirements:

Cracked Polyethylene Wax

BN 501, BN 502, BN 503 are suitable for general PE & PP color masterbatches and high loading inorganic filler systems. They deliver outstanding wetting and de-agglomeration performance, reduce extruder main engine load, and eliminate color spots and mottling.

Refined Polyethylene Wax

BN 506, BN 6020, BN 7030 feature high purity and low volatile content. These waxes provide excellent steric hindrance stabilization to prevent pigment re-agglomeration, improve surface gloss of finished products with no migration.

Oxidized Polyethylene Wax

BN 530A carries intrinsic polar groups, greatly improving wetting and compatibility for inorganic pigments, carbon black and titanium dioxide with remarkable dispersion performance. Ideal for high jet black carbon black masterbatches and calcium carbonate filled systems.

Please feel free to contact us for sample requests and formula adjustment technical support!

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Email:aerolyn@bouni-wax.com

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