POLYMER COMPOSITION FOR EXTREMELY SEVERE OPERATING CONDITIONS, SEALING DEVICE FOR FLEXIBLE AND FIXED JOINTS, DIAPHRAGM AND METHOD OF MAKING POLYMER ARTICLES FOR PNEUMATIC BRAKING SYSTEMS OF RAILWAY VEHICLES Russian patent published in 2011 - IPC C08L9/02 C08K3/04 C08K3/06 C08K3/22 C08K5/09 C08K5/10 C08K5/18 C08K5/40 C08K5/44 C08J3/12 C08J5/10 C08J5/22 

FIELD: chemistry.

SUBSTANCE: invention relates to production of industrial rubber articles which are used in conditions with heavy mechanical loads, friction, aggressive media and severe climatic conditions and can be used to make sealing devices for flexible and fixed joints of the type of rings, cuffs and linings, as well as for making actuating devices for membrane converters of pressure changes into linear displacements and components of braking systems of railway vehicles. The polymer composition contains the following components in pts. wt: paraffin butadiene nitrile rubber 90-100, butadiene methylstyrene rubber 0-10, technical sulphur 0.5-1.5, tetramethylthiuram disulphide 1-2, N,N'-dithiodimorpholine 1.5-2.5, N-cyclohexyl-2-benzthiazolyl-sulphenamide 1.0-2.5; zinc oxide 4-8, phenyl-β-naphthylamine 0.5-2.5, technical carbon 100-150, dibutylphthalate 20-40, dibutyl sebacate 20-40 and stearic acid 0.5-2.5.

EFFECT: invention enables to obtain articles which can work in aggressive media at temperature as low as minus 60°C, are stable under periodic dynamic loads and have high operational reliability and a guaranteed long useful life.

6 cl, 2 tbl, 3 ex