Aromatic and Epoxidised Oil Curing and Rebound Resilience Characteristic and their Humidity Effect of Hardness on NR Vulcanizates

Abstract:

Recently, aromatic oil (AO) is one of the substances that is typically used as a processing aid especially for high filler loadings in formulating rubber compound. Aromatic oil has disadvantages in that, it is hazardous to environment, toxic and has been labeled as carcinogenic. In this research, an epoxidised oil (EO) and aromatic oil were used to investigate the effect incorporation of oil onto the SBR/NR natural rubber vulcanizates (NR). From the result obtained, EO showed shorter cure time and scorch time as the oil loading were increased up to 20 pphr of EO. Physical properties such as hardness and rebound resilience of NR/EO vulcanisate were also investigated upon exposure to different humidity level in humidity chamber. At room temperature, the hardness of EO loading onto the SBR/NR vulcanisate is lower than AO loadings. Hardness was slightly decreased with increasing rate of humidity. There is great difference in hardness and rebound resilience values between AO and EO. Both hardness and rebound resilience were not affected by humidity. This implies the existence of good filler interaction with EO and rubber which do not impart changes in the hardness and resilience properties of rubber compound. Epoxidised oil has great promising potential to replace the carcinogenic aromatic oil as it has good overall performance and renewable in nature .

• Periodical: Advanced Materials Research (Volume 812)
• Pages: 138-144
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.812.138
• Online since: September 2013
• Authors: Mohamed Rahmah, Wan Zain Norazira, Shafie Nur Ashyikin, Mohd Nurazzi Norizan
• Keywords: Aromatic Oil, Cure, Epoxidized Oil, Hardness, Natural Rubber (NR), Rebound Resilience, Scorch Time

References

[1] S. Dasgupta, S.L. Agrawal, S. Bandyopadhyay,S. Chakraborty, R. Mukhopadhyay, R.K. Malkani and S.C. Ameta, Characterization of eco-friendly processing aids for rubber compound. Polymer Testing, Vol 26(4) (2007).pp.489-500.

DOI: 10.1016/j.polymertesting.2007.01.007

[2] A. Emilio, and R. Vivirito, Rubber processing oil and rubber products containing it, Exxon Research and Engineering, United States, (1993).

[3] A. Wik, and G. Dave, Environmental labeling of car tires-toxicity to Daphnia magna can be used as a screening method, Chemosphere, Vol 58(5) (2005) pp.645-651.

DOI: 10.1016/j.chemosphere.2004.08.103

[4] A. Samsuri, An Introduction to Polymer Science and Rubber Technology Pusat Penerbitan Universiti, Universiti Teknologi MARA, (2009).

[5] H.M. da Costa, T.A.S. Abrantes, R.C.R. Nunes, L.L.Y. Visconte and C.R.G. Furtado Design and analysis of experiments in silica filled natural rubber compounds-effect of castor oil. Polymer Testing, Vol 22(7) (2003), pp.769-777.

DOI: 10.1016/s0142-9418(03)00011-4

[6] P.P. Meyer, N.T. Salamah Manundawee, Sasitorn Sangkeaw, Wannapit Junlakan and Chakrit Tongurai Epoxidation of Soybean Oil and Jatropha Oil Int .J. Sc. Tech, Vol (13) (2008).Special edition: p.5.

[7] A.P. Kuriakose and G. Rajendran, Rice bran oil as a novel compounding ingredient in sulphur vulcanization of natural rubber. European Polymer Journal, Vol 31(6) (1995), pp.595-602.

DOI: 10.1016/0014-3057(94)00202-9

[8] N. Rattanasom, S. Prasertsri, and T. Ruangritnumchai, Comparison of the mechanical properties at similar hardness level of natural rubber filled with various reinforcing-fillers. Polymer Testing, 28(1) (2009), pp.8-12.

DOI: 10.1016/j.polymertesting.2008.08.004

[9] S. Laube, S. Monthey and M.J. Wang, Compounding with Carbon Black and Oil, USA: Hanser Publication. (2001).

[10] D.A. Mahapatra, B,P, Revathi, Performance evaluation of high structure carbon black in different polymer blends. Rubber World, November Vol. 231(2) (2004), p.33.

[11] K.R. Rajeesh, R, Gnanamoorthy, and R. Velmurugan, Effect of humidity on the indentation hardness and flexural fatigue behavior of polyamide 6 nanocomposite. Materials Science and Engineering, A, 527(12) (2010), pp.2826-2830.

DOI: 10.1016/j.msea.2010.01.070

[12] G. Chandrasekara, M.K. Mahanama, D.G. Edirisinghe and L. Karunanayake, Epoxidized vegetable oils as processing aids and activators in carbon-black filled natural rubber compounds. Journal of the National Science Foundation of Sri Lanka, Vol 39(3) (2011).

DOI: 10.4038/jnsfsr.v39i3.3628

[13] P.P. Kundu, Improvement of Filler–Rubber Interaction by the Coupling Action of Vegetable Oil in Carbon Black Reinforced Rubber. Journal of Applied Polymer Science, Vol. (75) (2000), p.735–739.

DOI: 10.1002/(sici)1097-4628(20000207)75:6<735::aid-app1>3.0.co;2-t

[14] P.P. Kundu, and T.R. Kukreja, Surface modification of carbon black by vegetable oil?. Its effect on the rheometric, hardness, abrasion, rebound resilience, tensile, tear, and adhesion properties. Journal of Applied Polymer Science, 84(2) (2002), pp.256-260.

DOI: 10.1002/app.10320