Features
Waterborne hydroxyl-functional polyacrylate dispersion, combined with fatty polyisocyanate for waterborne Two-component polyurethane varnish.
Supply Form
about 45% in water/1-butoxy-2-propanol , neutralized with dimethylethanolamine, 3.6% 1-butoxy-2-propanol.
Specifications
| Features | Number | unit | Test method |
| Viscosity, 23°C (D approx. 40 s-1) | ≤ 1200 | mPa·s | DIN EN ISO 3219/A.3 |
| Non-volatile component content (1g/1h/125°C, rotary oven) |
42 - 46 | % | DIN EN ISO 3251 |
| pH value (Form of Supply) |
7 - 9 | DIN ISO 976 |
Other Data
| Features | Number | unit | Test method |
|
Hydroxyl value calculated value |
about 3.9 | % | |
| acid value | about 11 | mg KOH/g | DIN EN ISO 2114 |
| density,20℃ | about 1.06 | g/ml | DIN EN ISO 2811 |
Features /application
Bayhydrol®A 2770 is a hydroxyl functional polyacrylate dispersion, the product It can be used after diluting with water. Bayhydrol® A 2770 can be mixed with aliphatic polyisocyanate to prepare high-gloss topcoat, which can be dried naturally or forced at room temperature. Example: at 80°C
The cured paint film is strong and flexible, and has excellent water resistance and solvent resistance resistance, chemical resistance. When properly prepared, e.g. in combination with Bayhydur®
ultra304, the ratio of NCO/OH is 1.5:1, and the pot life is about 4 hours.
Bayhydrol®A 2770 has good pigment wetting properties and excellent shear stability sex. A sander is suitable sanding equipment. Only pigments and fillers with minimum water soluble content may be used. Compatibility testing is usually performed for many pigments and fillers. When Bayhydur®
Or when Desmodur® is added to the slurry, a thickener must be added to ensure a high shear effect. The addition of about 0.4% Borchigen® PW25 (binder calculated on solids) has proven suitable for formulations based on Bayhydrol® A 2770. To improve the leveling and substrate wetting properties of coatings, eg BYK®349 and BYK®378 can be added. BYK®011 has proven to be a suitable defoamer. Coating and dispensing equipment can be cleaned with water, alkaline cleaners, or isopropanol.
Phase Capacitance
Suitable co-reactants for waterborne two-component polyurethane formulations, such as Desmodur® N3400, N 3600, N 3800 or N3900, Bayhydur®ultra 3100, ultra 304, ultra 305, 401-70, ultra 2487/1, XP 2655 or XP 2759
dissolve Sexuality/Dilution
Bayhydrol®A 2770 can be diluted with water in any proportion.
Save
Keep in an airtight original Covestro container.
Suggested storage temperature: >0-30℃
Avoid freezing, heat and foreign substances
General information: Short term cooling to -18°C usually does not damage the product. This product is sensitive to freezing. Freezing for long periods of time can seriously damage the product. Long-term storage at higher temperature will lead to a decrease in viscosity or an increase in average particle size, which may lead to precipitation or coagulation. The viscosity of this product mainly depends on the pH value. The pH may decrease during storage, resulting in a decrease in viscosity. The viscosity can be restored to its original value by adding a small amount of 10% aqueous solution of dimethylethanolamine. The product will be unusable due to contamination by certain bacteria, mold or algae.
Save Time
Covestro declares that the product is stored in full compliance with the Where required and properly handled, the product complies with the specifications or characteristic values stated in the above clause "Specifications or characteristic values" (as applicable) within 6 months from the date of shipment stated on the transport document. The fact that a product exceeds the aforementioned 6-month period does not mean that it no longer conforms to the values set forth in the specifications or characteristic values. However, Covestro recommends that products older than 6 months from the date of shipment be tested before use to confirm whether they still comply with the values set forth in the specifications or characteristic values. Covestro makes no promises and accepts no responsibility or liability for non-conformity to specifications or characteristic values for products beyond 6 months from the date of shipment.
Security
This product data sheet applies only to the latest version of the corresponding safety document. Any updates to safety-related information consistent with legal requirements will only be reflected in the Safety Data Sheet, which will be updated and published. Information pertaining to current classification and labelling, application and process methods, and additional safety data can be found on the latest valid safety data sheet.
The pH in �� may decrease, resulting in a decrease in viscosity. The viscosity can be restored to its original value by adding a small amount of 10% aqueous solution of dimethylethanolamine. The product will be unusable due to contamination by certain bacteria, mold or algae.
Save Time
Covestro declares that the product is stored in full compliance with the Where required and properly handled, the product complies with the specifications or characteristic values stated in the above clause "Specifications or characteristic values" (as applicable) within 6 months from the date of shipment stated on the transport document. The fact that a product exceeds the aforementioned 6-month period does not mean that it no longer conforms to the values set forth in the specifications or characteristic values. However, Covestro recommends that products older than 6 months from the date of shipment be tested before use to confirm whether they still comply with the values set forth in the specifications or characteristic values. Covestro makes no promises and accepts no responsibility or liability for non-conformity to specifications or characteristic values for products beyond 6 months from the date of shipment.
Security
This product data sheet applies only to the latest version of the corresponding safety document. Any updates to safety-related information consistent with legal requirements will only be reflected in the Safety Data Sheet, which will be updated and published. Information pertaining to current classification and labelling, application and process methods, and additional safety data can be found on the latest valid safety data sheet.
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