The Effect of Fillers of Various Activities on the Water Swelling of Rubbers Based on BNR

Abstract

The influence of fillers of various activities on the water swelling (WS) of rubbers based on BNR (BNKS-28AMN) was studied. Carbon black of
different activity grades N330, N550, P705 and white soot BS-120 were used as fillers. The swelling of the vulcanized rubbers was carried out in
distilled water. Processing properties and vulcanization characteristics of the studied rubber compounds, physical and mechanical properties
and resistance to aging of vulcanized rubbers were determined according to the corresponding GOST. The study of changes in the mass and
volume of samples in water during exposure at room temperature was carried out according to GOST 9.030-74. The kinetics of vulcanization
of rubber compounds was studied on the MDR-2000 vibroreometer (Alpha Technologies, USA). Dynamic tensile endurance was determined
under elongation of 150 %. There is white soot BS-120 and carbon black N330 in the amounts of 10,0 and 30,0 phr respectively in composition
of vulcanized rubber of optimal properties. For products where a small WS is required, one can use this vulcanized rubber. If 60 phr a waterswelling
reagent (sodium polyacrylate, SAP) is injected into this rubber, it can be used for products where high WS is needed, such as packers.
Possible reasons for the difference in changes in mass and volume at WS are discussed.