Bayhydrol® A 2770
Bayhydrol A 2770 is an aqueous hydroxyl-functional polyacrylic dispersion, in combination with aliphatic polyisocyanates for waterborne two-component polyurethane coatings.
Bayhydrol A 2770 should be stored in tightly sealed original containers and protected from freezing, heat, and foreign materials. Short-time cooling down to -18°C does not typically damage the product. Prolonged freezing can damage the product irreversibly. Prolonged storage at higher temperatures may result in a decrease of viscosity and/or an increase of average particle size, possibly resulting in sedimentation or coagulation. The viscosity of the product is largely governed by the pH. As the pH may decrease during storage, a decrease in viscosity is also to be expected. The viscosity can be adjusted to its original value by the addition of small amounts of an aqueous 10% solution of dimethyl ethanol amine. Recommended storage temperature is greater than 0ºC-30ºC.
|Viscosity at 23°C(D = approx. 40 s^-1)||mPa∙s||≤ 1,200|
|pH (1:4 in demineralized water)||7.0 - 9.0|
|Non-volatile content (1g/1h/125°C,circulating air oven)||%||42 - 46|
|Hydroxyl content (on solid resin, calculated)||%||approx. 3.9|
|Acid value||mg KOH/g||approx. 11.0|
|Density at 20°C||g/ml||approx. 1.06|