Fields of application

ACRONAL® NS 567 (soon to be discontinued; click on replacement product Acronal 4567 for more info) an aqueous polymer dispersion for the manufacture of flexible Roof Coating (slope > 2°, non-ponding conditions), elastomeric coatings, architectural paints, textured finishes and primers for mineral substrates.

Processing

ACRONAL® NS 567 has good filler compatibility and pigment binding capacity. The unpigmented film is tacky at room temperature, clear, very flexible, water-resistant and resistant to saponification.

Emulsion paints are manufactured in the usual manner with the aid of high-speed dispersers. It is recommended that the pigments and fillers first be dispersed with dispersing and wetting agents such as Pigment Disperser A or Pigment Disperser N and water-soluble polyphosphates. The pigments and extenders should only be dispersed directly into ACRONAL® NS 567, if the end products are of high viscosity (e.g., textured finishes) and the mixers run at low speeds.

In general, thickeners have to be added to regulate the viscosity and facilitate application. The most suitable thickeners are cellulose ethers, either by themselves or in combination with inorganic compounds (montmorillonite, highly dispersed silicates), polyacrylates or diurethanes.

In the presence of pigments, particularly those in the form of pigment preparations (e.g. Luconyl® types), some thickeners may be responsible for pigment flocculation or the formation of serum. It is therefore advisable to carry out storage trials and compatibility tests, adding nonionic surfactants (Lumiten® N types) if necessary.

Although ACRONAL® NS 567 forms a continuous film above 33 °F (1 °C); it is recommended that a small quantity of coalescent be added to those paints, textured finishes and mixtures that are highly pigmented. Mineral spirit containing aromatics, glycol ethers, Lusolvan® FBH and Texanol® are suitable. A high-boiling, water miscible solvent such as propylene glycol may be added to improve the wet edge time.

In common with all other fine particle size dispersions, ACRONAL® NS 567 tends to foam. As a consequence, defoamers should be incorporated. They should be added in the amounts recommended by the manufacturers (i.e. about 0.3 – 1%), and their efficiency should be checked by prior experiment. Although ACRONAL® NS 567 is protected from attack by microorganisms; preservatives must be added to the made-up paints in order to ensure that their quality remains unimpaired over long storage periods. Again, prior experiment is essential for checking their compatibility and efficiency.