Coating raw materials

Water-reducible, hydroxyfunctional polyacrylic dispersion.In combination with aliphatic polyisocyanates to formulate aqueous two-component clear- and topcoats for vehicle repair applications, heavy transport finishing and industrial coating.In combination with amino resins or blocked polyisocyanates for waterborne, one-component, industrial baking coatings.

Product Types

Dispersion

Acrylate dispersion

Material

Coatings, paints & inks

Hard, Waterborne, Flexible, Elastic

Applications

General STD A 145 is a hydroxyfunctional polyacrylic dispersion which can be thinned with water to application viscosity. STD A 145 has good pigment wetting properties and high shear stability. Bead mills have proved suitable as grinding equipment. Only pigments and extenders with a minimal water-soluble content should be used.Given the many pigments and extenders available, compatibility testing should always be carried out.Application and formulation equipment can be cleaned with water, alkaline cleaning agents or isopropanol.Two-component industrial coatingsSTD A 145 combined with aliphatic polyisocyanates yields high-gloss topcoats which can be dried at room temperature or force-dried, e.g. at 80 °C.The cured paint films are hard and flexible with good single-coat adhesion and good resistance to solvents and water.When mixing STD or STD into the mill base, a thickener must be added to ensure a high shear effect.The addition of approx. 0.3 % STD RM 8 (calculated on the solid binder) has proved suitable for formulations based on STD A 145. One-component industrial baking coatingsSTD A 145 can be used in combination with melamine resins for the formulation of baking coatings with < 5 % co-solvent at application viscosity. The systems cure in as little as 30 min at 120 °C. The ratio of STD A 145 to amino resin (solids on solids) is generally 80 : 20. Given the many amino resins available, compatibility testing should always be carried out.As a hydroxyfunctional binder, STD A 145 is also suitable as a co-reactant for waterborne aliphatic polyisocyanates. The OH : NCO ratio should be 1 : 1.To ensure the storage stability of one-component coating systems based on STD A 145. the pH should be set to approx. 8.5 during formulation.

Form supplied

Approx. 45% in water / SN 100 / 2-butoxyethanol, dimethyl ethanol amine neutralized, 4% SN 100. 4% 2-butoxyethanol.

Solubility / thinnability

STD A 145 can be thinned with water. It has only partial compatibility with glycol ethers and glycol ether esters.

Compatibility

Suitable co-reactants for the formulation of waterborne two-component polyurethane systems are aliphatic polyisocyanates such as STD ultra N 3300. ultra 3600. STD 302. ultra 304. ultra 305 and ultra 401-70.

Specification

Property	Test Condition	Value	Unit	Standard
Acid value		10 ± 3	mg KOH/g	DIN EN ISO 2114
Viscosity	at 23 °C, D = 41.28 s^-1	950 ± 550	mPa*s	DIN EN ISO 3219/A.3
Non-volatile content	(1g/1h/125 °C/convection oven)	45 ± 2	%	DIN EN ISO 3251
pH-value		7.2 – 8.2		DIN ISO 976

Typical Values

Property	Test Condition	Value	Unit	Standard
Density	at 20 °C	approx. 1.06	g/ml	DIN EN ISO 2811-2
OH % on solid		approx. 3.3	%	calculated
Flash point		approx. 53	°C	DIN EN ISO 1523

Storage

– Storage in original sealed STD container.

– Recommended storage temperature: > 0 ≤ 30 °C.

– Protect from frost, heat and foreign material.

General information: Short-time cooling down to -18 °C does not typically damage the product, but the viscosity may increase significantly. Prolonged freezing can damage the product irreversibly.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 an aqueous 10 % solution of dimethylethanolamine. 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. Contamination with certain bacteria, fungi or algae may render the product unusable.

Storage time

We represent 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, we recommend to test such a product if it still meets the specifications or the set values. We do not make any representation regarding the product after the lapse of the six months period and we 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.

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