Non-Silicone Defoamer for High-Solid Inorganic Coatings

Microfoams in high-solid inorganic coatings (＞70% solids) cause "pinholes" during spraying. A Jiangsu ceramic coating manufacturer reduced rejection rate from 15% to 0.5% using Chemi Tech KM-780 (polyether-mineral oil composite):

＞95% microfoam reduction: Foam layer thickness decreased from 12mm to 0.8mm at 0.3% dosage；

Film density increased 30%, extending salt spray resistance to 1,500 hours；

Compatibility with silica/alumina sols in pH 3-12 systems.

Mechanism:

Polyether chains reduce surface tension below 24 mN/m；

Hydrophobic mineral oil ruptures bubble elasticity；

Nano-modified silica (＜1 μm) pierces foam structures without causing "fisheyes".

Case:

Added 0.4% during quartz powder grinding (60% loading)：

Grinding capacity increased 28%；

Zero pinholes in sprayed films；

Adhesion on galvanized steel reached Class 1 (cross-cut test).