1. Introduction

Stable UV-curing colorant requires fine dispersion. This article describes 5 key grinding control points for DENSON UV colorant based on bead mill processing, with parameters and standards.

Fig.1 300L pin-type horizontal bead mill

2. Mechanism

Wet grinding uses zirconia beads to shear and deagglomerate pigment. A UV colorant is a pigment dispersion in acrylate monomers/oligomers; excessive temperature can prematurely gel, so cooling is critical.

3. Control Point 1: Bead Size

Use 0.3-0.8 mm zirconia beads; smaller beads give finer fineness but lower throughput. ACM 2026 notes polymeric dispersants improve nano-dispersion stability.

Fig.2 Erichsen grind gauge 0-25 μm

4. Control Point 2: Tip Speed

Set 10-14 m/s; too high causes temperature rise and premature curing, too low leaves coarse particles.

5. Control Point 3: Temperature

Keep material temperature ≤40 ℃ via jacket cooling; above 50 ℃ acrylate gels risk.

Fig.3 Grind gauge showing pigment traces

6. Control Point 4: Fineness Check

Test with grind gauge; target ≤15 μm per GB/T 1724.

7. Control Point 5: Viscosity

Keep 2000-4000 mPa·s per GB/T 2794; too low causes sedimentation, too high reduces wetting.

8. Key Parameters

More in Literature and DENSON.

9. Conclusion

Bead size, tip speed, temperature, fineness and viscosity are the 5 control points; stable cooling and in-process grind checks yield a consistent UV colorant.

10. FAQ

Q1: Why keep temperature low?
A: UV acrylates can pre-polymerize above 50 ℃.

Q2: What bead size for nano fineness?
A: 0.3-0.5 mm, but throughput drops.

Q3: How to check fineness?
A: Grind gauge per GB/T 1724.

Q4: Ideal viscosity?
A: 2000-4000 mPa·s (GB/T 2794).

Q5: What tip speed?
A: 10-14 m/s on a pin-type mill.