DISPEX AA 4140
DISPEX AA 4140
Dispex AA 4140 is a dispersing agent that is derived from a family of highly effective, low-viscosity dispersing agents for water-based coating systems, especially suitable for the dispersion of inorganic pigments.
Dispex® AA 4140 is an ideal dispersing agent for a wide range of water-based coatings. It can be used as supplied. The neutralizing alkali used in conjunction with the acrylic polymer can significantly impact the properties of the final coating. The sodium-based Dispex 4140 often contributes slightly negatively to the dry-film coating properties.
This product is effective over a pH range of 5 – 12 and up to temperatures in excess of 100°C.
Performance Data
Dispex AA 4140 is based on an organic polymer and provides improved storage stability of both pigment dispersion and formulated paint when compared with inorganic dispersing agents, e.g., polyphosphate products. There is little or no adverse reaction to high temperatures or pH changes as indicated in the graphs below (examples showing the accelerated effects).
Stability of pigment dispersion to interactions between basic pigment and dispersing agent. Acrylic latex containing china clay and CaCO3, stored at 20°C.
Stability of pigment dispersion to heat. Acrylic latex containing china clay, stored at 50°C.
Properties
| Typical Properties | Value |
| Solvent | Water |
| Density at 20°C | ~ 1.03g/cm3 |
| Solid Content | ~ 43% |
| Active Content | ~ 40% |
| Viscosity at 20°C | ~ 400 mPas |
| pH | ~ 8 |
