The two-component polyurethane primer-enamel is used as an anticorrosive primer and decorative enamel for painting metal surfaces (black, galvanized, steel, and aluminum).
It is utilized in machine-building, shipbuilding, bridge construction, industrial and civil construction, oil and gas, chemical industries, housing and communal services, and agriculture.
Base (Component A) — a mixture of anticorrosive pigments and special additives in hydroxyl-containing acrylic resin.
Hardener (Component B) — aliphatic isocyanate.
The primer-enamel is characterized by a high drying speed of the coating, strength, elasticity, and resistance to mechanical stress, exposure to water, salts, and oils.
The coating is weather-resistant, immune to direct sunlight, temperature changes from minus 50°C to plus 60°C, and can withstand short-term heating up to plus 140°C.
Table 1. Technical Characteristics of the Liquid Material
| Characteristic | Value |
|
Recommended ratio of components: Component A Component B |
100 parts by mass 8.5 parts by mass |
| Non-volatile content | no less than 65% |
| Conditional viscosity by viscometer VZ-246 (nozzle 4 mm) at (20±2)ºC | 80-130 s |
| Degree of grinding | no more than 50 micrometers |
| Drying time to degree 3 | no more than 0.5 hours |
|
Coverage of the dried film: white, yellow, red, orange, green blue, black, gray, brown, gray-white |
no more than 250 g/m2 no more than 100 g/m2 |
Table 2. Technical Characteristics of the Coating
| Property | Value |
| Appearance | Smooth, uniform glossy surface |
| Gloss of the coating by photoelectric gloss meter | Not less than 70% |
| Coating resistance to static liquid exposure | Water — not less than 720h, 3% NaCl solution — not less than 720h, 0.5% detergent solution — not less than 24h |
| Film elasticity during bending | Not more than 1 mm |
| Film strength upon impact | Not less than 50 cm |
| Film hardness by «TML» pendulum device | Not less than 0.5 relative units |
| Heat resistance at 140°C | Not less than 48 hours |
| Total thickness in the dry layer | 90-120 µm |
The paint in liquid form causes irritation when it comes into contact with the skin or eyes and can trigger an allergic reaction.
Once dry, the coating does not have a negative impact on the human body or the environment.
Clean the surface from old coating residues, rust, dirt, dust, traces of grease, and other contaminants to degree 2 according to GOST 9.402.
Degrease the surface to degree 1 according to GOST 9.402.
Perform the painting no later than 6 hours after surface preparation.
Allow the primer-enamel and the equipment for its application to stand for a day at an air temperature of +15°C to +30°C.
Stir component A to form a uniform mass for 5 minutes using a mixer with a spiral attachment (ZUBR MR-1400-21 or similar), at a speed of 300-450 rpm.
Add component B to component A in the recommended ratio and mix to obtain a homogeneous mass. Close the container and let it stand for 20 minutes to remove air bubbles from the mixture.
Air temperature from +5°C to +30°C.
Substrate temperature from +5°C to +30°C and 3°C above the dew point.
Relative air humidity less than 80%.
Primer-enamel application is allowed at temperatures below 5°C and above 30°C. Consider the change in the viscosity of the components, drying time of the coating, taking into account the temperature dependence of the material hardening reaction (see Table 4).
Do not work near open sources of fire. When working with polyurethane primer-enamel in a closed space, ensure ventilation and have fire extinguishing means available. Use personal protective equipment: special clothing, gloves, footwear, protective glasses, and a respirator.
In case of contact with skin, remove the product with a cotton swab or cloth, then rinse with warm soapy water. In case of contact with eyes, rinse with plenty of water. Seek medical attention if irritation occurs.
Airless spraying (spray gun similar to HYVEST 7300);
Pneumatic spraying (spray gun similar to FUBAG BASIC S1000/1.8 HP);
Manually using a brush or roller.
Table 3. Recommended Application Parameters
|
Parameter |
Value |
| Recommended thinner | xylene, toluene |
| Airless Spraying | |
| Amount of thinner | up to 5% |
| Working pressure | 12–16 MPa (120–160 bar) |
| Nozzle diameter | 0.011–0.017 inches (0.28–0.43 mm) |
| Spraying angle | 20–60° |
| Pneumatic Spraying | |
| Amount of thinner | up to 10% |
| Working pressure | 0.2–0.4 MPa (2–4 bar) |
| Nozzle size | 1.5–2.0 mm |
Apply in 2–3 layers, considering the drying time between layers.
Total thickness of the finished coating should not exceed 120 µm. Control the thickness of the finished coating using a thickness gauge like Konstanta K5.
Table 4. Dependence of Interlayer Drying Time on Temperature
| Air Temperature During Application | Drying Time for Single Layer Application |
| −10°C | no more than 6 h |
| +5°C | no more than 3 h |
| +10°C | no more than 1 h |
| +20°C | no more than 30 min |
| +40°C | no more than 20 min |
Problem: The base of the primer-enamel (component A) delaminates during prolonged storage.
Solution: Stir component A to form a uniform mass for 5 minutes using a mixer with a spiral attachment (like ZUBR MR-1400-21 or similar), at a speed of 300-450 rpm.
Problem: Poor fan pattern opening during spraying due to high viscosity.
Solution: Heat the paint to a temperature of +15°C to +30°C by keeping it for a day in a heated room or dilute it with xylene/toluene (see Table 3). If the fan pattern opening is still insufficient after diluting the paint, adjust the working pressure of the device or the nozzle diameter.
The primer-enamel is transported by all types of transport in closed vehicles in accordance with the rules for cargo transportation that ensure the preservation of the containers without damage and leaks.
Storage temperature for components: from 0°C to +30°C.
Transportation temperature for components: from −10°C to +30°C.
Shelf life under the recommended conditions without opening the container: 18 months from the date of manufacture.
Polyurethane glossy ground enamel for painting concrete, wood, and metal surfaces exposed to atmospheric and/or chemical effects.
To increase fire resistance in heat - insulation materials made of polyurethane foam.
