Expanded Polystyrene Beads Coated with Intumescent Flame Retardant Material to Achieve Fire Safety Standards

Area of Science:

• Materials Science
• Polymer Chemistry
• Fire Safety Engineering

Background:

• Achieving effective flame retardancy in expanded polystyrene (EPS) foam is challenging due to compatibility issues with flame retardant materials.
• Optimizing the coating ratio between flame retardants and EPS is crucial for enhancing fire performance.

Purpose of the Study:

• To develop and evaluate a water-based intumescent flame retardant system for methylene diphenyl diisocyanate (MDI)-coated EPS.
• To investigate the compatibility and fire performance of the novel flame retardant system with MDI-coated EPS.

Main Methods:

• Preparation of a water-based intumescent flame retardant system.
• Coating of expandable polystyrene (EPS) microspheres with methylene diphenyl diisocyanate (MDI).
• Microscopic analysis to confirm material incorporation.
• Cone calorimeter tests (CCTs) to assess fire performance metrics.

Main Results:

• Successful incorporation of water-based intumescent flame retardant materials with MDI-coated EPS microspheres.
• MDI-coated EPS with the flame retardant system showed significantly reduced total heat release (THR) to 7.3 MJ/m², peak heat release rate (PHRR) to 57.6 kW/m², and fire growth rate (FIGRA).
• Substantial reduction in total smoke production (TSP) to 0.133 m² was observed.

Conclusions:

• The developed water-based intumescent flame retardant system is compatible with MDI-coated EPS.
• MDI-coated EPS incorporating this system exhibits superior flame retardant properties.
• The enhanced flame retardancy meets established fire safety standards.