Vegetable oils were investigated as plasticizers to improve the sustainability of rubber compounding. The potential use of different vegetable oils as an alternative to petroleum‐based rubber process oils was reviewed. This article presents a literature review on the current understanding of the influence of vegetable oil properties on natural rubber (NR) compounding. Hansen solubility parameters of the vegetable oils were determined to assist with the selection of vegetable oil for NR. We believe that the use of Hansen parameters could make the use of vegetable oils in rubber more convenient and cost‐effective.
Good selection of natural rubber compounds is substantial in rubber industry. Behavior of products based on natural rubber is determined by rubber blending components, especially nature of process oil and concentration of reinforcing fillers. Rubber process oil main purpose is to improve dispersibility of fillers and reduce the viscosity of the rubber compound, therefore enable better processing. Mineral oils are mostly used process oils in natural rubber compounding, but, due to their toxicity and new requirements for preservation of the environment, more and more well-known manufacturers have turned to the use of environmentally friendly process oils. In this study, influence of the hempseed oil as process oil on the products properties in natural rubber compounding was investigated. Properties of hempseed oil as process oil were experimentally determined or calculated. Blending of natural rubber was performed in a laboratory by internal batch mixer, at the constant temperature of 90°C and a rotor speed of 60 rpm. Main rubber properties such as hardness, tensile strength, elongation at break, modulus at 100 and 300% elongation, and rheological properties were determined. Also, voltage and amperage were experimentally measured for calculating power consumption during effective mixing phase in rubber blending.
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