Effect of ENR50/STR5L Blends on Properties of Foodstuff Conveyor Belts Compound

Abstract:

Natural rubber blending with nitrile rubber is the important raw material employed for the foodstuff conveyor belts formulation. This research involves the replacement of nitrile rubber with epoxidised natural rubber (ENR) aiming for food safety precaution and cost saving on the materials. This work included the investigation on the ratio of ENR with 50% epoxidation (ENR50) and natural rubber (Standard Thai Rubber 5L,STR5L). The ratios of ENR50:STR5L were 100:0, 75:25, 50:50, 25:75 and 0:100. The effect of fillers, i.e. silica (SiO₂) and magnesium carbonate (MgCO₃) on the properties of rubber blends was also investigated. The vulcanizing system was semi-efficient vulcanization (Semi-EV). The study was further focused on the morphological characterization and mechanical properties. It was found that increasing the proportion of ENR50 and STR5L at 50% produced better mechanical property, however, the elongation at break increased once the ENR50 was down at 25%. Thus, this enhanced the property of the foodstuff conveyor belts compound.

• Periodical: Key Engineering Materials (Volume 701)
• Pages: 243-249
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.701.243
• Online since: July 2016
• Authors: Suphatchakorn Limhengha, Sunpasit Limnararat, Wipoo Sriseubsai
• Keywords: Foodstuff Conveyor Belt, Mixed Filler, Rubber Blends

References

[1] J.G. Bonner, P.S. Hope, Compatibilisation and reactive blending, In polymer blends andAlloys, M.J. Folkes and P.S. Hope, (eds. ). Blackkie Academic and Professional, London, 1993, Chapter 3.

DOI: 10.1007/978-94-011-2162-0_3

[2] J.T. Andrew, P.J. Kevin, Blends of natural rubber novel techniques for blending with speciality polymers, London: Chapman and Hall, (1998).

[3] F.W. Barlow, Rubber compounding : principles, materials and techniques. 2nd Edition, Marcel Dekker, Inc., New York, (1993).

[4] P. Soo-Jin, C. Ki-sook, Fill-elastomer interactions : influence of silica coupling agent on crosslink density and thermal stability of silica of silica/rubber composites. Journal of colloid and interface Science, 267(2003) 86-91.

DOI: 10.1016/s0021-9797(03)00132-2

[5] K. Kongsin, V.L. Micheeal, Improving the morphology and properties of NR/NBR blends with polychloroprene as the compatibilizing agent. In J.T. Andrew and P.J. Kevin, Blends of natural rubber: novel techniques for blending with speciality polymer. London ; Chapman and Hall, 1998, pp.80-93.

DOI: 10.1007/978-94-011-4922-8_7

[6] A.R. Bhattacharyya, A.K. Ghosh A. Misra and K.J. Eichhorn, Reactively compatibilised polyamide 6/ ethylene-co-vinyl acetate blends: mechanical properties and morphology. Polymer, 46(2005) 1661-1674.

DOI: 10.1016/j.polymer.2004.12.012

[7] V.L. Micheal, NR/NBR blends-basic problems and solutions. In J.T. Andrew and P.J. Kevin, Blends of natural rubber: novel techniques for blending with speciality polymer. London ; Chapman and Hall, 1998, pp.53-67.

DOI: 10.1007/978-94-011-4922-8_5

[8] C. Sirisinha, S. Baulek-Limcharoen and J. Thunyarittikorn, Relationships among blending condition, size of dispersed phase, and oil resistance in natural rubber and nitrile rubber blends. Journal of Applied Polymer Science, 82(2001) 1232-1237.

DOI: 10.1002/app.1957

[9] Z.P. Fang, G.W. Ma, B.Q. Shentu, G.P. Cai and C.W. Xu, Influence of viscosity ratio on the morphology of PVC/PE blends. European Polymer Journal, 36(10)(2000) 2309-2311.

DOI: 10.1016/s0014-3057(99)00275-x

[10] R. Tol, G. Groeninckx, I. Vinckier, P. Moldenaers and J. Mewis, Pase morphology and stability of co–continuous (PPE/PS)/ PA6 and PS/ PA6 blends: Effect of rheology and reactive compatibilization. Polymer, 45(8)(2004) 2587 – 2601.

DOI: 10.1016/j.polymer.2003.12.072

[11] S.C. Jana, M. Sau, Effects of viscosity ratio and composition on development of morphology in chaotic mixing of polymers. Polymer, 45(2004) 1665–1678.

DOI: 10.1016/j.polymer.2003.12.047

[12] I.R. Gelling, Epoxidised natural rubber. J. Nat Rub., 6(1991) 184-205.

[13] N. Rattanasom, T. Saowapark and C. Deeprasertkul, Reinforcement of natural rubber with silica/carbon black hybrid filler. Polymer Testing, 26(2007) 369-377.

DOI: 10.1016/j.polymertesting.2006.12.003

[14] S.Y. Lee, J.H. Kim and B.K. Kim, Natural rubber blends with epoxidized natural rubber. J. Macrom. Sci., 36(1997) 579-594.

DOI: 10.1080/00222349708220443

[15] Y. Heping, L. Sidong and P. Zheng, Preparation and study of epoxidized natural rubber. Journal of Thermal Analysis and Calorimetry, 58(1999) 293-299.

DOI: 10.1023/a:1010199013587

[16] C.K.L. Davies, S.V. Woffe, I.R. Gelling and A.G. Thomas, Strain crystallization in random copolymers produced by epoxidation of cis-1, 4-Polyisoprene. Polymer, 24 (1983) 107-113.

DOI: 10.1016/0032-3861(83)90090-3

[17] H. Ismail, M.N. Nasaruddin and U.S. Ishiaku, White rice husk ash filled natural rubber compounds : the effect of multifunctional additive and silane coupling agents. Polymer Testing, 18 (1999) 287-298.

DOI: 10.1016/s0142-9418(98)00030-0