Influence of Radiation Cross-linking and Nano-filler on the Flammability of Ethylene Vinyl Acetate and Low Density Polyethylene Blends for Wire and Cable Applications

Abstract

Magnesium hydroxide and huntite hydromagnesite were used in halogen free flame retardant (HFFR) compounds based on blends of ethylene vinyl acetate and low density polyethylene. The effect of both cross-linking with electron beam (EB) and the introduction of nano-filler on flammability were investigated. The developed compounds exhibited an improved oxidation induction temperature. A delay in the beginning of the decomposition of compounds was observed due to barrier effect as demonstrated by the cone calorimeter test. In addition, time to ignition increased with increase of irradiation dose and heat release rate was inhibited due to use of nano-fillers.

Keywords

HFFR compound flame retardant magnesium hydroxide huntite hydromagnesite wire and cable EB cross-linking nano-filler EVA LDPE.

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References

Morga, A.B. , Cogen, J.M. , Opperman, R.S. and Harris, J.D. ( 2007). The Effectiveness of Magnesium Carbonate-based Flame Retardants for Poly(ethylene-co-vinyl acetate) and Poly(ethylene-co-ethyl acrylate), Fire Materials, 31: 387-410.

Naskar, K. , Mohanty, S. and Nando, G.B.J. ( 2007). Development of Thin Walled Halogen Free Cable Insulating and Halogen Free Fire Resistant Low Smoke Cable Sheathing Compound based on Polyolefin Elastomer and EVA Blends, Applied Polymer Science , 104: 2839-2848.

Weil, E.D. and Levchik, S.C. ( 2008). Flame Retardants in Commercial Use or Development for Polyolefins, Journal of Fire Sciences, 26: 5-42.

Bourbigot, S. , Le Bras, M. , Duquesne, S. and Rochery, M. (2004). Recent Advances for Intumescent Polymers, Macromolecular Materials and Engineering, 289: 499-511.

Estevao, L.R.M. , Le Bras, M. , Delobel, R. and Nascimento, R.S.V. (2005). Spent Refinery Catalyst as a Synergistic Agent in Intumescent Formulations: Influence of the Catalyst’s Particle Size and Constituents, Polymer Degradation Stability , 88: 444-455.

Xie, F. , Wang, Y.Z. , Yang, B. and Liu, Y. ( 2006). A Novel Intumescent Flame-retardant Polyethylene System , Macromolecular Materials and Engineering, 291: 247-253.

Haurie, L. , Fernández, A.I. , Velasco, J.I. , Chimenos, J.M. , Cuesta, J.M.L. and Espiell, F. ( 2006). Synthetic Hydromagnesite as Flame Retardant. Evaluation of the Flame Behaviour in a Polyethylene Matrix, Polymer Degradation Stability, 91: 989-994.

Scelza, C. and Zaopo, A. ( 2004). Self-extinguishing Cable and Fire Retardant Composition used therein, US Patent 6, 797, 200.

Durin-France, A. , Ferry L. , Lopez-Cuesta, J.M. and Crespy, A. (2000). Magnesium Hydroxide/Zinc Borate/Talc Compositions as Flame-retardants in EVA Copolymer, Polymer International, 49: 1101-1105.

10.

Laoutid, F. , Gaudon, P. , Taulemesse, J.M. , Lopez-Cuesta , J.M. , Velasco, J.I. and Piechaczyk, A. (2006). Study of Hydromagnesite and Magnesium Hydroxide Based Fire Retardant Systems for Ethylene-Vinyl Acetate containing Organo-modified Montmorillonite, Polymer Degradation Stability, 91: 3074-3082.

11.

Szep, A. , Szabo, A. , Toth, N. , Anna, P. and Marosi, G. ( 2006). Role of Montmorillonite in Flame Retardancy of Ethylene-Vinyl Acetate Copolymer, Polymer Degradation Stability, 91: 593-599.

12.

Genovese, A. and Shanks, R.A. ( 2007). Structural and Thermal Interpretation of the Synergy and Interactions between the Fire Retardants Magnesium Hydroxide and Zinc Borate, Polymer Degradation Stability, 92: 2-13.

13.

Hashimoto, D. , Nishiguchi, M. , Iwata, K. and Saito, K. (2003). Insulated Wire, US Patent 6, 627, 819.

14.

Ali, Z.I. (2007). Effect of Electron Beam Irradiation and Vinyl Acetate Content on the Physicochemical Properties of LDPE/EVA Blends, Journal of Applied Polymer Science, 104: 2886-2895.

15.

Dadbin, S. , Frounchi, M. and Sabet, M. ( 2005). Studies on the Properties and Structure of Electron-beam Cross-linked Low-density Polyethylene/ Poly[ethylene-co-(vinyl acetate)] Blends , Polymer International, 54: 686-691.

16.

Jiao, C.M. , Wang, Z.Z. , Ye, Z. , Hu, Y. and Fan, W.C. ( 2006). Flame Retardation of Ethylene-Vinyl Acetate Copolymer Using Nano Magnesium Hydroxide and Nano Hydrotalcite, Journal of Fire Science, 24: 47-64.

17.

Jiao, C. , Wang, Z. , Chen, X. , Yu, B. and Hu, Y. ( 2006). Irradiation Cross-linking and Halogen-free Flame Retardation of EVA using Hydrotalcite and Red Phosphorus, Radiation Physics and Chemistry, 75: 557-563.

18.

Laoutid, F. , Ferry, L. , Leroy, E. and Lopez Cuesta , J.M. (2006). Intumescent Mineral Fire Retardant Systems in Ethylene-Vinyl Acetate Copolymer: Effect of Silica Particles on Char Cohesion, Polymer Degradation Stability, 91: 2140-2145.

19.

Ghaffari, M. and Ahmadian, V. (2007). Investigation of Antioxidant and Electron Beam Radiation Effects on the Thermal Oxidation Stability of Low-density Polyethylene, Radiation Physics and Chemistry , 76: 1666-1670.

20.

Du, L. , Qu, B. and Xu, Z. ( 2006). Flammability Characteristics and Synergistic Effect of Hydrotalcite with Microencapsulated Red Phosphorus in Halogen-free Flame Retardant EVA Composite, Polymer Degradation Stability, 91: 995-1001.

21.

Wang, Z.Z. , Qu, B.J. , Fan, W.C. and Huang, P. ( 2001). Combustion Characteristics of Halogen-free Flame-retarded Polyethylene Containing Magnesium Hydroxide and some Synergists, Journal of Applied Polymer Science, 81: 206-214.