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 ƒp, breaking strain εр, 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 ƒp and εр 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 ƒp on 14-17 % and εр on 15-30 % in comparison with unfilled TPV. Effect on ƒp and εр 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.