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DTI / MEMTI /A layer by layer assembled barrier to impart flame retardancy to polypropylene substrate

A layer by layer assembled barrier to impart flame retardancy to polypropylene substrate

Speaker: Anna Rita De Corso Authors: Andrea Castrovinci, Anna Rita De Corso, Simone Martinelli

marzo 4, 2017

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DTI / MEMTI /A layer by layer assembled barrier to impart flame retardancy to polypropylene substrate

Summary

• Intro SUPSI
• Project goal
• Layer by layer technique
• Multilayers formulations
• Combustion test
• Results and conclusions

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DTI / MEMTI /A layer by layer assembled barrier to impart flame retardancy to polypropylene substrate

Intro

University of Applied Sciences and Arts of Southern Switzerland

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DTI / MEMTI /A layer by layer assembled barrier to impart flame retardancy to polypropylene substrate

Intro

Mechanical Engineering And Materials Technology Institute (MEMTi)

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Mechanical Engineering Hybrid Materials Thermofluid Dynamics Therapeutic Technologies Bio- Environmental Technologies

Research topics § Structural simulations (FEM) § Plastic injection moulding § Metal stamping § Ceramic foams § Composite materials § Polymeric materials § Surface chemistry § Simulations of gas/liquid flows § Thermodynamics § Pharmaceutical technologies § Medical systems § Computational modeling § Quality assurance & regulatory issues § Waste water treatment § Bio-mass techn. § Material recovery

DTI / MEMTI /A layer by layer assembled barrier to impart flame retardancy to polypropylene substrate

Project goal

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• Flame retardant coating for a PP substrate
• Target performance : B Euroclass according to SBI test (EN 13823)

DTI / MEMTI /A layer by layer assembled barrier to impart flame retardancy to polypropylene substrate

Layer by Layer assembly

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• What is the LbL technique
• Why?

Materials engineering for surface-confined flame retardarcy, G. Malucelli, F. Carosio, J. Alongi, A. Fina, A. Frache, G. Camino, Material Science and engineering R (2014) 1-20 Layer-by-layer assembly for rapid fabrication of thick polymeric films Yang Li,a Xu Wanga and Junqi Sun*a Chem. Soc. Rev., 2012,41

DTI / MEMTI /A layer by layer assembled barrier to impart flame retardancy to polypropylene substrate

Coating formulations

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1 K.Apaydin, A. Laachachi, V. Ball, M. Jimenez, S. Bourbigot, V. Toniazzo and D. Ruch, Polymer Degradation and Stability, 2013, 98, 627.

Intumescent Hybrid (organic-inorganic)1 Inorganic

DTI / MEMTI /A layer by layer assembled barrier to impart flame retardancy to polypropylene substrate

Multilayer sequence 1

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• No reduction in HRR
• Poor adhesion to the PP substate
• Polymer melting and dripping

Intumescent hybrid Inorganic

After 30 sec After 180 sec

DTI / MEMTI /A layer by layer assembled barrier to impart flame retardancy to polypropylene substrate

Multilayer sequence 2

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Inorganic Hybrid Intumescent

• No reduction in HRR
• Poor adhesion to the PP substate
• Polymer melting and dripping

DTI / MEMTI /A layer by layer assembled barrier to impart flame retardancy to polypropylene substrate

Multilayer sequence 3

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Inorganic Intumescent Hybrid

• Slight reduction in HRR
• Good adhesion to the PP substate
• Slight melting and dripping

DTI / MEMTI /A layer by layer assembled barrier to impart flame retardancy to polypropylene substrate

Multilayer sequence 4

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Inorganic Hybrid

• Good reduction in HRR
• Good adhesion to the PP substate
• No melting and dripping

DTI / MEMTI /A layer by layer assembled barrier to impart flame retardancy to polypropylene substrate

Combustion test

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• Screening combustion test: mini Single Burning Item test1,2
• Best performers : standard SBI test

1 Mini single burning item (miniSBI): a unique lab-scale device to pre-screen reduced specimen for the EN 13823, A. De Corso, A. Castrovinci, Fire

resistance in plastics 2015, 8 - 10 December 2015, Cologne, Germany

2 A comparative test campaign between the “mini Single Burning Item” and the standard SBI (EN13823) to assess the correlation between the two testing

facilities, Anna Rita De Corso, Simone Martinelli, Ermanno Oberrauch, Andrea Castrovinci

DTI / MEMTI /A layer by layer assembled barrier to impart flame retardancy to polypropylene substrate

Combustion test : miniSBI results

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DTI / MEMTI /A layer by layer assembled barrier to impart flame retardancy to polypropylene substrate

Conclusions

• Effective layer by layer assembled FR coating
• Performance assessment by miniSBI
• Work in progress : SBI standard test

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DTI / MEMTI /A layer by layer assembled barrier to impart flame retardancy to polypropylene substrate

Acknowledgments

• Dr Jenny Alongi, Department of Chemistry, University of Milan, for fruitful

discussions and suggestions

• Commission for Technology and Innovation (CTI, Switzerland)

Project: FLAme REtarded polypropylene film for coated Steel (FLARES)

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DTI / MEMTI /A layer by layer assembled barrier to impart flame retardancy to polypropylene substrate

Thank you

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DTI / MEMTI /A layer by layer assembled barrier to impart flame retardancy to polypropylene substrate

Mini SBI results

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DTI / MEMTI /A layer by layer assembled barrier to impart flame retardancy to polypropylene substrate

Mini SBI results

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DTI / MEMTI /A layer by layer assembled barrier to impart flame retardancy to polypropylene substrate

Mini SBI results

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DTI / MEMTI /A layer by layer assembled barrier to impart flame retardancy to polypropylene substrate

Best performers

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