Polyether Sponge Foam Coloring Paste
Polyether sponge (such as polyurethane soft foam) requires the addition of color paste during the foaming process to achieve even coloring. The selection of color paste must meet the following requirements:
Compatibility: The color paste must be compatible with polyether polyols, additives (such as catalysts, silicone oils), to avoid affecting the foaming stability.
Thermal resistance: During foaming, high temperatures (80-120℃) may occur; the color paste must withstand heat without decomposition.
Dispersivity: Color paste requires high fineness (typically ≤10μm) to ensure there are no particles and to avoid damaging the bubble structure.
Recommended Color Paste Types: Polyurethane-specific color paste (such as solvent-based or water-based), containing a high proportion of pigments (20-40%) and dispersants.
Key Parameters:
Carbon Black Content: 20-40% (affects coloring power and cost).
Carrier Type: Polyether-based (better compatibility with foaming systems).
Viscosity: 500 - 3000 cps (for easy pumping and mixing).
3. Application Recommendations
Addition Ratio: Typically 1-3% of polyether polyol (specifically determined by testing).
Mixed Process: The color paste must be mixed thoroughly with polyether polyol first, followed by the addition of foaming agents, catalysts, etc.
Testing Verification: After a small-scale foaming test, check the uniformity of color, bubble structure, and physical properties (such as density and resilience).
4. Common Issues Resolution
Color variation: May occur due to uneven mixing or batch differences. It is recommended to use the same color paste from the same supplier.
Porous with large pores: Poor color paste dispersion; replace with a product of higher fineness or enhance dispersion.
Foam collapse: High acidity or alkalinity of color paste, pH value needs to be tested (neutral is preferred).
For specific product models or local supplier recommendations, please provide further details of your requirements (such as foaming process, target color standards, etc.).
