Elastomeric materials used as seals in Siberia and Russian Far North have to meet requirements of the high freeze resistance. The butadiene-nitrile V-14 rubber (SKN-18 base) was modified by a 10 % addition of ultra-high molecular polyethylene or F4MB fluoropolymer. An increase in its elastic recovery coefficient at minus 45 deg C from 0.171 to 0.241 as well as increases in its hardness and wear resistance were achieved without any remarkable decrease in its mechanical strength. Another modification was carried out by addition of natural zeolites (1 % to 10 %) or ultradisperse diamond-like graphite (0.1 % to 1 %) as active fillers. The addition of zeolite did not result in any increase in the elastic recovery coefficient at minus 50 deg C (0.24 to 0.26) but caused a considerable increase in the tensile strength (from 14 MPa to 98 MPa). Addition of the diamond-like graphite resulted in an increase in the elastic recovery coefficient (from 0.24 to 0.45 at minus 50 deg C) and in the ultimate elongation (from 170 % to 286 %). An electron-microscopic study on the supramolecular structures of the diamond-like graphite-modified resins showed a substantially changed morphology of the matrix with some layered substructures. The seals made of the ultrahigh-molecular polyethylene-modified V-14 rubber were tested for air and oil-tightness in a special hydraulic stand (10 MPa, rod speed 0.2 m/s and frequency 0.5 GHz) and used for construction of the 200 km long Talakan-Vitim petroleum pipeline (operated at low air temperatures in the Sakha Republic) and for construction of Maria and Ruslan-type aeroplanes.
Freezeproof rubbers for sealing
Titel russisch
Tjazeloe Masinostroenie ; 4 ; 27-30
2001
4 Seiten, 4 Bilder, 2 Tabellen, 12 Quellen
Article (Journal)
Russian
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