Dispex® AA 4040

Dispex® AA 4040 is a highly effective, low viscosity dispersing agent designed for use in water-based coating systems. Here’s an overview of its properties, benefits, and applications:

Description

Dispex® AA 4040 is a solution of an ammonium salt of an acrylic polymer in water. It is especially suitable for the dispersion of inorganic pigments and fillers, providing improved storage stability for both pigment dispersion and formulated paint compared to inorganic dispersing agents like polyphosphate products.

Typical Properties

• Physical Form: Straw-colored liquid
• Solvent: Water
• Density at 20 °C (68 °F): Approximately 1.16 g/cm³
• Solid Content: Approximately 45%
• pH Value: Approximately 7.5

Storage

Although Dispex® AA 4040 is freeze-thaw stable, it should be stored at temperatures above 5 °C (41 °F) to ensure easy handling.

Application

Dispex® AA 4040 is an ideal dispersing agent for a wide range of water-based coatings. It can be used as supplied and is based on an organic polymer that releases ammonia during the drying process, which minimally impacts water and alkali resistance of the dry film. The use of Dispex® AA 4040 is recommended within a pH range of 5 to 10.5 and temperatures below 70 °C (158 °F) to prevent the loss of volatile ammonia.

Dispex® AA 4140 is the sodium-neutralized version of the same polymer.

Incorporation

• Dispex® AA 4040 should be added under stirring before adding pigments or fillers to the grind.
• For optimal dispersing efficiency, the final preparation pH should be around 8.5.
• The amount of dispersing agent required depends on the pigment's chemical nature, particle surface, and shape, as well as the polymer base of the latex.
• To avoid storage problems, it is recommended to use 1.5 to 2.0 times the determined optimum level of dispersing agent.

Recommended Dosage

• 0.5% to 2% based on total pigment weight.

Benefits

• Effective Dispersion: Improved stability of pigment dispersion and formulated paint.
• Minimal Impact: Releases ammonia during drying, which has little impact on water and alkali resistances of the dry film.
• Versatility: Suitable for a wide range of water-based coatings.
  

  Summary

  Dispex® AA 4040 is a versatile and highly effective dispersing agent that improves the stability and performance of water-based coatings, especially in the dispersion of inorganic pigments and fillers. Its ease of use and minimal impact on the final properties of coatings make it a valuable additive for formulators.