Bayhydrol® A 2646
page 1 of 3
Edition Bayhydrol®
Replaces edition dated Product Datasheet
Type Anionic polyacrylate dispersion
Form supplied approx. 50 % in water/Dowanol® PnB/triethanolamine (46 : 1.1 : 2.9)
Uses Waterborne, low VOC two-component polyurethane coatings in combination
with aliphatic polyisocyanates.
Specification
Property Value Unit of measurement Method
Non-volatile content
(1 g/1 h/125 °C/convection oven)
48 - 51 % DIN EN ISO 3251
Viscosity at 23 °C
D = approx. 40 s-1
1,000 - 3,500 mPa·s DIN EN ISO 3219/A.3
pH
(1 : 4 in demineralised water)
7 - 8 DIN ISO 976
Other data*
Property Value Unit of measurement Method
Hydroxyl content,
(calculated on solid)***
approx. 3.8 % internal method
Hydroxyl content,
(supply form)
approx. 2.7 % internal method
Density at 20°C approx. 1.06 g/ml DIN EN ISO 2811-2
*** w/o OH groups of the Dowanol® PnB and triethanolamine
*These values provide general information and are not part of the product specification.
Solubility / thinnability The product is soluble in water.
Properties / Applications On account of its outstanding mechanical and chemical resistance, the product
is particularly suitable for the formulation of hard, high-gloss sealers for mineral
substrates and reactive resins (EP, PUR). Furthermore, excellent accentuation
of the grain of the substrate (e.g. colored coatings) is achieved.
The binder can also be used for the formulation of high-grade low VOC
coatings for use on substrates such as wood, metal, plastic, etc.
The product can also be combined with other water-reducible binders. On
account of the many potential co-reactants, compatibility testing should always
be carried out.
The high reactivity enables short drying times, which contribute to enhanced
productivity.
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 restored to its original value by the addition of small amounts
of triethanol amine.
Dowanol® PnB and triethanolamine are OH-functional cosolvents/amines
that react with isocyanates. They are therefore reactive thinners and not
VOC-relevant pursuant to the Decopaint Directive EC.
Storage - Storage in original sealed Bayer MaterialScience containers.
- Recommended storage temperature: > 0 - 30 °C.
- Protect from frost, heat and foreign material.
General information: The product is sensitive to frost. 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 Triethanolamine.
Contamination with certain bacteria, fungi or algae may render the product
unusable.
Bayhydrol® A 2646
page 3 of 3
Edition Bayhydrol®
Replaces edition dated Product Datasheet
Storage time Bayer MaterialScience represents that, for a period of six months following the
day of shipment as stated in the respective transport documents, the product
will meet the specifications or values set forth in section "specifications or
characteristic data" above, what ever is applicable, provided that the product is
stored in full compliance with the storage conditions set forth in and referenced
under section "storage" above and is otherwise handled appropriately.
The lapse of the six months period does not necessarily mean that the product
no longer meets specifications or the set values. However, prior to using
said product, Bayer MaterialScience recommends to test such a product if it
still meets the specifications or the set values. Bayer MaterialScience does
not make any representation regarding the product after the lapse of the six
months period and Bayer MaterialScience shall not be responsible or liable in
any way for the product failing to meet specifications or the set values after
the lapse of the six months period.
Safety Hazards identification
Not classified as a hazardous product as per Council Directive EC
or EC.
The safety data
