Ground rubber tire (GRT) powder is devulcanized using a counter-rotating twin screw extruder and then the product is mixed with 30 phr virgin natural rubber (NR) and HAF carbon black added in various proportions. The data obtained from a cure rheometer is used to fit in a four-parameter logistic model to correlate the variation of torque with time. The mechanical properties were evaluated, which suggested that optimum properties are obtained with a 15 phr HAF addition. The effects of a sulfur/accelerator (S/CBS) ratio study reveals that satisfactory properties are obtained at a S/CBS ratio of 1.5/0.75.
Kohler, R. and O'Neill, J. (1999). New Technology for the Devulcanization of Sulfur-cured Scrap Elastomers , Rubber World, 216(2): 32–37 .
5.
Ishiaku, U.S. , Chong, C.S. and Ismail, H. (1999). Determination of Optimum De-Link R Concentration in a Recycled Rubber Compound, Polym . Testing, 18(8): 621–633 .
Adhikari, B. , De, D. and Maiti, S. (2000). Reclamation and Recycling of Waste Rubber, Prog . Polym. Sci., 25(7): 909–948 .
8.
Smith, F.G. (1978). In: Babbit, R. (ed.), The Vanderbilt Rubber Handbook, R.T. Vanderbilt Company Inc. , p. 329-329.
9.
Bilgili, E. , Arastoopor, H. and Bernstein, B. (2001). Pulverization of Rubber Granulates Using the Solid-state Shear Extrusion (SSSE) Process: Part I. Process Concepts and Characteristics , Powder Technol., 115(3): 265–276 .
10.
Isayev, A.I. , Chen, J. and Tukachinsky, A. (1995). Novel Ultrasonic Technology for Devulcanization of Waste Rubbers, Rubber Chem . Technol., 68(2): 267–280 .
11.
Hong, C.K. and Isayev, A.I. (2002). Ultrasonic Devulcanization of Unfilled SBR Under Static and Continuous Conditions, Rubber Chem . Technol., 75(1): 133—142 .
12.
Yun, J. , Oh, J.S. and Isayev, A.I. (2001). Continuous Ultrasonic Devulcanization of Carbon Black-filled NR Vulcanizates , J. Appl. Polym. Sci., 79(13): 2340–2348 .
13.
Yun, J. and Isayev, A.I. (2001). Ultrasonic Devulcanization Reactors for Recycling of GRT: Comparitive Study, Rubber Chem . Technol., 74(2): 317–330 .
14.
Yun, J. and Isayev, A.I. (2001). Superior Mechanical Properties of Ultrasonically Recycled EPDM Rubber, Rubber Chem . Technol., 76: 253–270 .
15.
Fukumori, K. , Matsushita, M. , Okamoto, H. , Sato, N. , Suzuki, Y. and Takeuchi, K. (2002). Recycling Technology of Tire Rubber , JSAE Review, 23(2): 259–264 .
16.
Ismail, H. , Nordin, R. and Noor, A.M. (2002). Cure Characteristics, Tensile Properties and Swelling Behaviour of Recycled Rubber Powder-filled Natural Rubber Compounds, Polym . Testing, 21: 565–569 .
17.
Fan, R. , Zhang, Y. , Huang, C. , Gong, P. and Zhang, Y. (2002). Simulation and Verification for Sulfur Accelerated Vulcanization of Gum Natural Rubber Compound, Rubber Chem . Technol., 75(2): 287–298 .
18.
Krejsa, M.R. , Koenig, J.L. and Sullivan, A.B. (1994). Analysis of the Mechanism of N-t-Butyl-2-Benzothiazole Sulfenamide Accelerated Sulfur Vulcanization of cis-Polyisoprene, Rubber Chem . Technol., 67(2): 348–358 .
19.
Maridass, B. and Gupta, B.R. (2006). Cure Modeling and Mechanical Properties of Counter Rotating Twin Screw Extruder Devulcanized Ground Rubber Tire and Natural Rubber Blends , J. Appl. Polym. Sci. (Communicated).
20.
Hofmann, W. (1989). Rubber Technology Handbook, Hanser Publishers, New York , p. 227-227.
