RAL Color Metal Appliance Epoxy Polyester Powder Coating
| Composition | It is made of epoxy resin, polyester resin, pigment, filler and anti-yellowing additives
through melting, extruding, grinding and processing. |
Main
features | The gloss can be adjusted within 5-60% (60°);
Good anti-yellowing performance;
Good physical and mechanical performance and resistance to chemicals and heat. |
| Application | It is applicable to the coating of household appliances, instruments, meters, light industrial products,
office equipment, library equipments and electromechanical equipment with relatively
high requirements. |
Product
series | Powders with different glosses and colors can be made according to customers’ requirements. |
Technical
indexes
| Residue on sieve %125μm | 0 or based on negotiation |
| Color and appearance of paint film | The paint film should be smooth but slight orange peel is allowed
and the color should meet the color difference specified. |
| Hardness | ≥2 H |
| Gloss (60°) | According to customers’ requirements |
| Bending mm | 2 |
| Adhesive force (1×1 mm) Grade 6×6 | 0 |
| Impact resistance kg.cm | ≥5 |
| Acid resistance (HCI 3%)240 h | The film has no change. |
| Alkali resistance (NaOH 5%) 168 h | Slight change is allowed but it shall recovered within 2h. |
| Salt spray resistance 400 | ≤ Grade 1 |
| Damp-heat resistance 500 | ≤ Grade 1 |
| Film thickness μm | 50~60 |
Surface
preparation | The corresponding treatment method should be used based on the substrates, such as phosphating,
chromizing, shot blasting or blast cleaning
1. The surface roughness should be 30 ~75 μm if reaching Grade Sa2.5 by shot blasting
or blast cleaning.
2. Phosphating: degreasing- derusting- neutralizing- surface control- phosphating- passivating
Appearance of phosphating film: The phosphating film should be crystallized densely,
continuously and evenly.
3. Chromizing: degreasing- rinsing- immersion cleaning- deoxidating- rinsing- chromizing |
Method of
Application | It is applicable to high voltage electrostatic spraying
Spraying voltage: 50-90 kV; air pressure for spraying: 0.1-0.2 Mpa;
distance between the gun and workpiece: 200-300 mm
Curing condition: 180/15-20 minutes or customized according to customers’ requirements.
Additional coating: different measures should be taken for the specific conditions:
1. If the requirements are not high, paints with the same color can be used for additional coating;
2. In case of high requirements, spraying and curing should be made after polishing the omitted part
with sand paper and spraying the whole surface. |
