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IJSTR >> Volume 8 - Issue 8, August 2019 Edition

International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616

Study On Use Of Lignin As An Antioxidant In SBR Based Tire Tread Compound

[Full Text]



A.H.L.R. Nilmini, Nuwan Surej



Tire tread compound, Kraft Lignin, Antioxidant



Next to cellulose, Lignin is the second most abundant plant based organic polymer in the world. Currently over 70 million of lignin is produced mainly through chemical pulping process. At present high amount of lignin use as inexpensive fuel or raw material to produce low added value products. The main aim of this study was investigation of potential of lignin to use as low cost, environmental friendly, high effective antioxidant for SBR based tire tread compound. Tread of a solid tire is degraded in static and dynamic conditions as it is exposed with the external environment. Oxygen is the principal environment factor, however, property deterioration are also supported by heat, light, humidity and radiation. Antioxidants hinder the oxidation of rubber and prevent property deterioration. Petroleum-based antioxidants are commonly used in tread compounds, though they have disadvantages like risk on health and adverse influence to environment. Therefore, this study aimed to investigate the possibility of replacing conventional antioxidants with a bio-based substitute. Kraft lignin (KL) is a naturally abundant and cost competitive wood-derivative and possesses antioxidant properties with Phenolic functionality. Lignin was compared with two conventional antioxidants, namely, N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine (6PPD) and sterically hindered styrenated phenol (SP). KL was varied from 2 to 3 phr at 0.5 phr intervals when it was used alone. When Lignin was combined with 6PPD and SP, each antioxidant was varied from 0 to 2 phr at 0.5 phr intervals, maintaining total loading at 2 phr. Mechanical Properties, Cure characteristics and other industrially important testing on rubber tread compound was investigated before and after thermo-oxidative aging. KL has reinforced the Vulcanizate, showing highest physical properties in tensile strength, tear strength, elongation at break, rebound resilience, hardness and abrasion resistance compared to Vulcanizate prepared incorporating commercially available antioxidants before the aging. After the aging cross linking density, abrasion resistance, rebound resilience and hardness have increased and other properties and their retentions have decreased in lignin alone than other Vulcanizate. Higher properties retention in tensile strength, tear strength, elongation at break and improvement in abrasion resistance except 6PPD and styrinated phenol alone show by Vulcanizate with lignin: 6PPD (1: 1) and lignin: Styrenated phenol (0.5: 1.5) ratios. Blend of KL and other antioxidants demonstrate better antioxidant effect than KL alone. The results obtained are shown that the KL exerts a stabilizing effect. Moreover KL blends with other selected antioxidants increased the stabilization effect.



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