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TEXTURED FINISH PROPERTIES
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Pencil Hardness |
Hiding Power |
Double MEK rubs |
Chemical resistance (DIN 68861, 1B) ammonia (10%)(2min), red wine, cola, mustard, ketchup (16 h), acetone (10 s)
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| Black |
2H |
Color |
>200 |
no damage |
| Blue |
2H |
Good |
>200 |
no damage |
| Green |
2H |
Good |
>200 |
no damage |
| Red |
2H |
Good |
>200 |
no damage |
| White |
2H |
High |
>200 |
no damage |
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*The amount of texturing can be varied by changing the particle size
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POWDER COATINGS: THERMOSET vs. UV CURABLE
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Thermoset Powders
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| Heating/Curing Method |
Temperature |
Total Curing Time |
Substrates |
| Convection |
140-220ºC |
30-15 min |
metal |
| IR + Convection |
140-220ºC |
25-10 min |
metal |
| IR** |
160-250ºC |
15-5 min |
metal |
| Induction |
240-300ºC |
<1 min |
metal |
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UV Powders
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Heating
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Curing
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Temperature
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Total Curing Time
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Substrates
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| IR + Convection |
UV/EB seconds |
90-140ºC |
1-3 min |
metal, wood, platics,... |
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Recently, systems curable at 120ºC/20-3 min have become available for the coating of MDF
**Curing speed can be increased (total curing time = seconds) by using Near IR (NIR)
AN UNUSUAL COMBINATION OF FAST CURING + LOW TEMPERATURE
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UV POWDER COATING TECHNOLOGY
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| THERMOSET POWDER COATING |
LIQUID |
| Preparation of powder formaulation (conventional extresion/grinding) |
Preperation of liquid paint formulation |
| Handling of powder formulation |
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| Electrostatic spray application |
Fast application techniques (roller/curtain coater) |
| Thick layers: one-coat process |
Thin layers |
| Melting of powder (IRM/convection) |
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| Thermal crosslinking at hight temperature (>150ºC) |
Fast crosslinking initiated by UV light |
| Long curing times |
High line speed |
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UV POWDERS FOR MDF
•MDF
- Interesting properties (uniform density, dimensional stability, good machinability,...)
- Stable at 100-140ºC
•Fast Growing Market >10% /year
•MDF Properties and UV Powder Coating
- Uniform density — defect-free profiles
- Humidity:4.5-8% — electrostatic
- In some cases, pre-heating recommended (100ºC, 3 min)
TYPICAL MDF PROPERTIES
Main Properties of MDF Used in These Studies
- Density: 790 - 830 kg/m_
- Uniform density >750 kg/m_
- Humidity: 4.5 - 6.0%
- Dimensional Stabillity: good at 150ºC
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