EPDM

Iirubha ze-EPDM   yintsapho yeerubha zokwenziwa zeqela le-M ngokwe-DIN/

/ISO 1629 kunyene -ASTM D 1418-19 yokuhlelwa. Iqela le-M liquka i-elastomers equkethe i-polymethylene-type polymer chain ngaphandle kwe-unsaturation ( i-double or triple bods ).

Iirubha ze-EPDM ziyi -terpolymers ezifunyenwe kwi- copolymerization ye -ethylene, ipropylene kunye ne-monomer yesithathu emelwe yi- diene .  Ii-dienes ezisetyenziselwa ukwenza iirubha ze-EPDM ziyi- dicyclopentadiene (DCPD), i-ethylidene norbornene (ENB), kunye ne -vinyl norbornene (VNB).

Umxube wee-reagents zokuveliswa kweerubha ze-EPDM ziqulethe malunga ne-45÷75% ethylene. Ukuphakama komxholo, ukuphakama kwamathuba okulayisha i-polymer, ngcono ukuxuba kunye ne-extrusion. I-vulcanization esekwe kwi-peroxide inika ezi polima ubuninzi bokudibanisa umnqamlezo xa kuthelekiswa ne -amorphous analogues. Iipolymers ze-Amorphous nazo zineempawu ezibalaseleyo zokucwangcisa, ezixhomekeke kwisakhiwo sabo se-molecular. I-dienes, eqhele ukuhluka ukusuka kwi-2.5% ukuya kwi-12% ngobunzima bekhompawundi, isebenza njenge-cross-links xa i-vulcanization isenziwa ngesulfure kunye ne-resin, ngelixa nge-peroxide-based vulcanizations i-diene (okanye i-monomer yesithathu) isebenza njenge-coagent. kwaye inikezela ukuchasana ngokuchasene ne -viscosity engafunekiyo, ukutyibilika okanye ukuhamba kwezinto ngexesha lokusetyenziswa kokugqibela.