Pemanfaatan minyak kulit biji mete sebagai plasticizer dalam pembuatan sol sepatu

The objective of the research was to study cashew nut shell liquid (CNSL) utilized as rubber plasticizer in shoe soles preparation. CNSL found from pressed cashew nut shells. CNSL consists of anacardict acid (90%) and cardol (10%). To remove the poison ivy, CNSL was treated by heating them at temperature 1200C for two hours. Sulfuric acid was also added to remove the impurities such as nitrogenous, sulphur and inorganic matters. Compounding process was carried out on two roll mill. Shoe sole compounds were prepared in various level of CNSL and Minarex B oil either separated formulation or in combination. Vulcanized rubber was then tested based on SNI 12-0172-1987 : Canvas shoes for general. The result of the research showed that CNSL can be utilized as rubber plasticizer in the shoe soles preparation. Compound with 5 phr CNSL provided good physical properties and conformed the requirements of SNI 12-0172-1987, such as tensile strength 136,4 kg/cm2, elongation at break 198,3%, tear resistance 63,56 kg/cm2, hardness 62,3 shore A, density 1,13 g/cm3, Grasselli abrasion resistance 0,711 mm3/ kgm, permanent set 6,40% and no crack detected on the flex cracking test. The research showed also that compound with the addition of 5 phr Minarex B oil into the compound, the CNSL provided better physical properties.