Feature
When selecting a white silicon dioxide (SiO2) powder for a UV topcoat, you'll want to focus on properties that ensure
both effective UV protection and desired appearance. Here are key factors to consider:
UV Blocking: The SiO2 powder should have UV-blocking properties to protect underlying layers from UV radiation,
preventing color fading, degradation, and other forms of damage.
Particle Size and Distribution: Fine particle size and uniform distribution are important for achieving a smooth, even
topcoat with good coverage. Smaller particles contribute to better dispersion and transparency in the coating.
Whiteness and Opacity: Look for a SiO2 powder that provides a bright white color and high opacity to ensure that
the UV topcoat effectively conceals underlying layers and provides a uniform white appearance.
Dispersion Stability: The SiO2 powder should disperse easily and uniformly in the topcoat formulation to ensure consistent
color and UV protection properties throughout the coating. Good dispersion stability prevents issues like settling or
agglomeration.
Surface Modification: Surface-treated SiO2 particles can improve compatibility with the topcoat resin and enhance
dispersibility, adhesion, and durability of the coating. Surface modification may also influence properties such as gloss and
scratch resistance.
Chemical Compatibility: Ensure that the SiO2 powder is chemically compatible with other components in the topcoat formulation
to prevent adverse reactions or changes in coating properties. Compatibility testing is essential to assess interactions with resins,
solvents, and additives.
UV Stability: The SiO2 powder itself should be UV stable to prevent degradation or discoloration of the topcoat over time when
exposed to UV radiation. UV-stabilized SiO2 particles help maintain the appearance and performance of the coating.
Regulatory Compliance: Ensure that the SiO2 powder meets relevant regulatory standards and safety requirements for use
in UV topcoat formulations, particularly concerning chemical composition, toxicity, and environmental impact.
| Item | SS-870 | Brand | SKYSIL
|
| Content of SiO2,(dry basis) %≥ | ≥ 99 | Whiteness | ≥ 90 |
| Porosity ml/g | ≥ 1.2 | Particle Size(Malvent),um | 6.0-7.0 |
| Loss on drying (105℃,2Hrs),% | ≤5.0 | PH | 6.0-7.0 |
| Ignition Loss(1000℃,2Hrs),% | ≤13.0 | Oil Absorption g/100g | 210-260 |
