The Effect of Modified Carbon Black on the Properties of Thermoplastic Vulcanizates Based on Blend of ABS-Plastic with Copolymer of Butadiene and Acrylonitrile
The results of the study of the effect of modified carbon black (MCB) on the physical and mechanical properties (tensile strength ƒ<sub>p</sub>, breaking strain ε<sub>р</sub>, tear strength, hardness, resilience), resistance to liquid aggressive environments (standard oil, motor oil, hydraulic oil, Euro-92 gasoline) and thermo-oxidative ageing of thermoplastic vulcanizate (TPV) based on blend of ABS-plastic with a copolymer of butadiene and acrylonitrile (BNKS) are presented. The values of ƒ<sub>p</sub> and ε<sub>р</sub> of TPV were measured by tensile tester Zwick / Roell Z 2.5. Two fluorinated fillers PKF-MS and PKF-2V grades, of a different type of production, elemental composition, and particles size were used as MCB. In all cases relationship BNKS / ABS plastic in TPV was 70/30. To prepare TPV, a two-stage mixing method was used, rubber compounds based on BNKS were obtained in the first stage, and ABS-plastic was introduced in the second stage, rotor mixer Plasti-corder LabStationBrabender was in use. The dosage of MCB ranged from 0 to 7 phr. The use of dosage of MCB of 3÷5 phr results in increase of ƒ<sub>p</sub> on 14-17 % and ε<sub>р</sub> on 15-30 % in comparison with unfilled TPV. Effect on ƒ<sub>p</sub> and ε<sub>р</sub> of thermo-oxidative ageing at 72 и 120 °С for 72 h and of action of aggressive liquids at 23 and 120 °С also for 72 h has been measured. The resistance of filled TPV to these actions is shown.