Anti-Cratering Solutions for Low-Energy Substrates: Chemi Tech Wetting Agents

PP plastics and nylon (surface energy <30 mN/m) challenge waterborne coatings due to poor wetting. Chemi Tech’s phosphate-siloxane hybrid agent overcomes this with:

Polar Anchoring & Spreading Enhancement

Phosphate groups form hydrogen bonds with nylon’s amide groups;

Short-chain siloxanes migrate to interfaces within 3 seconds, boosting substrate wetting tension >40 mN/m6. For nylon fan blades, 0.5% addition increased coating coverage by 50% and reduced edge shrinkage from 15% to 2%.

High-Speed Line Compatibility

In automotive lamp cover spraying (line speed: 3.5 m/min):

Shear-stable molecular chains resist pump degradation;

Millisecond-level tension reduction ensures uniform coverage on complex curves.

Case: Automotive PP Bumper Coating

Cratering occurred on waterborne acrylic-coated bumpers due to mold release agents:

Recoatability Advantage

Unlike fluorosurfactants, Chemi Tech’s agent maintains intercoat adhesion. For ABS tool housings with primer/topcoat systems (0.2% addition):

Adhesion remained 5B (KMP-1250);

Zero topcoat craters and no delamination.