Browsing by Author "Vithanachchi, J."

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    Development of a High Abrasion Resistance Shoe Sole Incorporating Four Different Silica Grades
    (Uva Wellassa University of Sri Lanka, 2021) Ruchikala, R.M.; Withanage, N.S.; Vithanachchi, J.
    Silica used as active reinforcing filler to improve high abrasion resistance in Rubber. In this study, the effect of four different silica grades (silica MP BET 161-190, silica powder newsil micro peral, silica 355GR and silica BET higher grade) on the abrasion resistance and other properties of the shoe sole have been studied. In this study type of silica grades was changed while keeping all the other ingredients and their amounts constant. The abrasion resistance was determined using DIN 53516 test method and the hardness, specific gravity, tensile strength and elongation at break were determined by following the respective ISO and ASTM standards. The results of the study showed that all four silica grades incorporated shoe soles have achieved acceptable abrasion resistance values. Achieved abrasion resistance value for shoe sole is maximum 350mm3. However, silica MP BET 161-190 has 289 mm3 which is also a quite higher abrasion resistance with a minimum loss of rubber in abrasion compared to other three silica grades. When considering the effect of silica grade on the physical properties of rubber compound, both silica MP BET 161-190 and 355GR grades showed acceptable values for all tested hardness, specific gravity, tensile strength and elongation at break of silica MP BET 161-190 grade incorporate sample were 48 IRHD, 1.088,17 MPa and 676% respectively. While silica 355GR incorporated sample were 51 IRHD, 17.1MPa and 631% respectively. However, both silica powder newsil micro peral and silica BET higher grade incorporated samples showed poor performance for the tested physical properties. Therefore, it can be concluded that, silica MP BET 161-190 is better performing as an active reinforcing filler with the highest abrasion resistance and a minimum loss of rubber in abrasion compared to other three silica grades. Keywords: Abrasion resistance; Physical properties; Shoe sole; Silica grades
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    Effect of Palm Oil as an Alternative Plasticizer in Tyre Tread Compound
    (Uva Wellassa University of Sri Lanka, 2013) Siriwardana, U.P.; De Silva, W.A.N.T.; Chandrasena, G.; Vithanachchi, J.
    Raw natural rubber and synthetic rubbers are compounded with other substances to have useful articles. Plasticizers play a major role in rubber compounding and petroleum based mineral oil are mostly used as plasticizers for tyre components. But mineral oil is a nonrenewable resource and some of them have been identified as carcinogenic. Naturally occurring oils from agricultural sources have been investigated as an alternative plasticizer in tyre tread compound for several years but there has been no systematic study of the effect of palm oil with respect to the all three types of mineral oils; aromatic, paraffinic and naphthenic oils. The objective of this work was to study the possibility of using palm oil as a cost effective alternative plasticizer for petroleum based mineral oils in tyre trade compound. The experiment was carried out in Research and Development section at Samson Compounds (Pvt) Ltd (DSI Group), Bataduwa, Galle, Sri Lanka. Four types of compounds were prepared with aromatic, naphthenic paraffinic and palm oil plasticizers according to the formulation of material. RSS III-75.000, SBR (Styrene Butadiene Rubber)-25.000, Processing oil-10.000, N330- Carbon Black-50.000, TMQ-Antioxidant-2.000, ZnO-5.000, Steric acid-1.500, 6PPD(N- benzthiazyl sulphenamide)-1.300, DPG (N-diphenylguanidine)-0.200, Sulfur-2.300, Wax-2.000 were used to prepare the tyre tread compound . Mixing was carried out on a laboratory size (160mmx320 mm) two roll mixing mill (Model - COMERI M-89) and the respective cure characteristics were determined using a Monsanto Rheometer (Model 100 FF). Tensile properties and tear strength were tested according to the ISO 37, 1977 using tensile tester (Model TS 1000). Hardness was determined as descri bed in ISO 48, 1979 with a dead load hardness tester. According to the ISO 815, 1991 compression set was tested. Abrasion resistance was measured according to the Din 53516 standards using Abrasion tester (Model GT-7012). Rebound resilience was measured using a Lupke Pendulum according to the ISO 4662-1986 standards. Specific gravity was measured using an Electronic densimeter. Thermal oxidative aging was analyzed as a measure of tensile properties. Tensile properties were tested for four types of compounds after aging over 22 hrs in 70 C and palm oil based compound was tested for tensile properties as a function over time.