Studies on the Synthesis of Silica Powder from Rice Husk Ash as Reinforcement Filler in Rubber Tire Tread Part: Replacement of Commercial Precipitated Silica

Abstract

Abstract:Rice husks, which can be considered as an agricultural waste, are produced every year in South Gonder, Ethiopia.Precipitated silica is commonly used as reinforcing filler in rubber industry, in the present study an effort has been attempted to replace commercial silica commonly used in natural rubber industries with rice husk ash silica (RHAS). Silica was extracted from RHA by using alkaline extraction followed by acid precipitation. The synthesized RHAS was characterized by AAS, BET, DSC, FTIR, and XRD. RHAS was then used as reinforcing filler in natural rubber. The curing characteristics of natural rubber products filled with RHAS resulted a smaller scorch time which caused a premature vulcanization than the commercial silica filled rubber composite. Overall mechanical properties like hardness, young's modulus, abrasion resistance of rubber products reinforced with RHAS was better than commercial silica filled rubber composite.

The effect of high purity rice husk silica synthesised using solvent-thermal extraction method on the properties of natural rubber compounds

“…The RHS-NR compound also showed lower abrasion loss compared to the CS-NR compound, thus indicating better reinforcing efficiency of the RHS-filled NR compound. This result is in agreement with the results in a similar study by Lemessa Jembere and Fanta (2017). The authors also suggested that the surface area of the filler is one of the crucial aspects indicating the tensile strength of the composites, which would also increase the modulus of the compound.…”

“…As shown by Dominic et al (2013) and Lemessa et al (2017), a filler's high surface area could provide better interactions between the fillers and the rubber matrix. Consequently, the overall strength-related properties of the rubber compounds are improved.…”

“…The rigidity of the RHS due to the high silica content in the ash increased the stiffness and reduced the elasticity of the rubber compound. Thereby, the incorporation of RHS in the NR restricted the movement of the rubber chains and consequently reduced the Eb value (Tiwari et al 2015;Jembere et al 2017).…”

“…The increasing decomposition temperatures suggested that the thermal aging resistance of the RHS-filled NR compounds was improved. The thermal stability analysis is very important to investigate how much the RHS fillers could withstand the vulcanisation temperature during the curing process of rubber compounds (Jembere et al 2017).…”

Effect of shrimp shell chitosan loading on antimicrobial, absorption and morphological properties of natural rubber composites reinforced with silica-chitosan hybrid filler

“…Peak at 1375 cm -1 and 1432 cm -1 are characteristic of CH 2 deformation and at the region 2852-2925 cm -1 represented the CH 2 symmetric stretching vibrations [21][22]. All of NR composites filled SiO 2 show a strong peak at 464 and 1086 cm -1 that were attributed to the asymmetric bending vibration and the asymmetrical stretching vibration of Si-O-Si, respectively [23][24]. The region between 908-1259 cm -1 of pure NR was intercepted by the asymmetrical stretching vibration of Si-O-Si in NR composites.…”