纳米分散技术

Overcoming the agglomeration bottleneck of traditional titanium dioxide, the particle size of titanium dioxide and other powders is precisely controlled at 0.2–0.4 µm. By uniformly dispersing these particles within the PE resin carrier, light scattering efficiency is maximized, ensuring high opacity, gloss, and stability. Extremely low coarse-particle residue helps eliminate screen clogging and surface defects.

Particle Size Distribution

For high-quality plastic-grade rutile titanium dioxide, particle size sits in the narrow window that maximizes white-light scattering. The optimum is around 250 nm, with the bulk of the distribution falling between 0.15 µm and 0.50 µm. A narrow, well-controlled distribution is what separates premium grades from commodity grades.

Volume frequency (%) D10 = 0.18 µm D50 = 0.28 µm D90 = 0.45 µm

图1 Frequency Distribution (Density Curve)

Cumulative volume (%) D10 intercept D50 intercept D90 intercept

图 2 Cumulative Distribution (S-Curve)

Hegman Dispersion and Screen Residue Testing

The resin forms a continuous phase network structure that encapsulates the powder, ensuring uniform dispersion. This effectively guarantees the aforementioned excellent whiteness, high opacity, and high tinting strength. For testing, the masterbatch is dissolved and converted into a filterable suspension. These test results indicate excellent overall dispersibility, uniform fineness, and an extremely low content of coarse particles and impurities, classifying it as a high-performance product capable of meeting demanding application requirements.

项目	Test Method	Specification	Test Result
Hegman Fineness Hegman gauge reading	ISO 1524	≥ 6	✓ 6.5
Residue on 45 µm Sieve Coarse particle content	ISO 1524	< 0.02 %	✓ < 0.018 %

Note: The masterbatch is dissolved in xylene and prepared as a homogeneous slurry for testing; reported results are the average of multiple measurements.