Introduction: Paint Drum Bulging (container expansion) is a serious safety hazard during storage, manifesting as container deformation due to internal solvent vaporization or chemical reaction gas generation. This phenomenon is particularly common in aluminum powder coatings, zinc powder coatings, and certain polyurethane coatings, potentially leading to spontaneous combustion, fire, or even container rupture in severe cases.
What is Paint Drum Bulging?
- Container bulging and deformation during storage
- High-risk systems: Aluminum powder coatings, zinc powder coatings, polyurethane coatings
- Potential risks: Spontaneous combustion, fire, container rupture and other safety incidents
Common Causes of Paint Drum Bulging
- Physical Swelling:
- High temperature storage causing solvent vaporization, increasing internal pressure
- Chemical Swelling:
- Aluminum powder reacting with free acid in coating to generate hydrogen
- Similar chemical reactions with zinc powder
- Gas generation from reactions between polyurethane coating components
- Long-term chemical reactions due to coexistence of free acid and water
Solutions to Prevent and Fix Paint Drum Bulging
- Storage Management:
- Avoid storage under high temperature conditions
- Immediately move swollen containers to cool, ventilated areas away from ignition sources
- Cool containers with cold water if necessary
- Production Process Improvement:
- Use separate packaging for aluminum/zinc powder coatings, mix before use
- Add 1%-2% dibutyltin laurate and other additives to polyurethane coatings
- Control resin acid value during production, avoid water contamination
- Emergency Handling:
- Puncture a small hole with sharp tool to slowly release gas before opening
- Wear gas mask when large amounts of white smoke appear
- Check coating condition after opening; usable if no livering or gelling
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