Hrehuš, Rudolf

Jurík, R.

Jurčiová, Jana

English

DSpace at VSB Technical University of Ostrava

Sborník vědeckých prací Vysoké školy báňské - Technické univerzity Ostrava číslo 1, rok 2009, ročník LIi, řada hutnická článek č. 1432 MONITORING SYSTEM OF THE CARBON BLACK DISPERSI ON IN A RUBBER BLEND Š I ' I Č Á2 R. HREHU , R. JURIK . J. JUR IOV 1 Faculty o/ lndustrial Technologies, Department o/ Physical Engineering o/ Materials, Alexander Dubfek University o/ Trenf{n; Púchov, Slovak Republic, e-mail: robert_jurik@fpt.tnuni.sk 1 Faculty o/ lndustrial Technologies, Department o/ Chemistry and Technology o/ Polymers, Alexander Dublek University o/ Trenf{n; Púchov, Slovak Republic, e-mail: jurciova@fpt.tnuni.sk ABSTRACT: The paper deals with the alternating current parameters of measurement in a mixer for preparation of rub ber blends. The mixing process was continuously monitored11through the changes of impedance Z and (fJ. Very good repetition ability ofthe mixing process was acliieved. KEY WORDS: rubber, electrical properties 1. INTRODUCTIONThe process of carbon black mixing is assumed in the following steps [1,2]. After the addition of the filler, agglomerates of the size up to 10-100 micrometers are created. In the blend, the rubber sheijs are created around the filler particles follo'Yed by filling up the voids within the filler agglomerates. Under stretching deformation caused by shearing forces, aggregates of 100 nanometers up to 0.5 micrometer appear after the breaking of the agglomerates. Primary particles, as a final product of mixing, have the dimension of approximately 20 nín. Smaller aggregates and primary particles appear at the expense of larger aggregates and agglomerates. It is necessary to underline that the whole process of mixing in the period of mastication and plasticization is accompanied by changes of rheological properties, where the viscosity decrease is caused by both the polymer breakdown and temperature rise respectively. The viscosity fall reaches the plateau with the smallest particle size (aggregates) in the structural point ofview. Further mixing spreads the particles homogeneously in the blend volume only. The change of conductivity and carbon black dispersion are determined by a very complex behavior of the mass in a mixing chamber. Corresponding change of the online conductivity, the rubber infiltration into the carbon black agglomerates, and the carbon black dispersion value in all the systems investigated have been observed on a large scale of rub ber mixtures. A linear chain structure, as well as a low molecular weight of the matrix rubber accelerates the infiltration process and hence the carbon black dispersion process takes place faster. In this paper we present the results of an electronic „in sítu" test of a rubber blend mixing. It has tested changes of AC electric parameters such as impedance, capacity, and phase angle caused by addition of chemical components to the natural rubber. 2. EXPERIMENTAL PROCEDURERubber blends were mixed in two steps. In the first step, we started with mixing natural rubber, then we added ZnO, then carbon black and finally oil. We have used carbon black N660 Cabot as a filler.. The temperature of the Brabender plasti-corder PLV 151 chamber was maintained at 80 °C. 36 

Monitoring system of the carbon black dispersion in a rubber blend

http://dspace.vsb.cz/bitstream/10084/71372/2/VSB%20HUF%202009-1_10_Hrehus.pdf

Monitoring system of the carbon black dispersion in a rubber blend

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