EPDM
Iirubha ze-EPDM [1] [2] 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.
- ↑ Green, Mark M. (luglio 2003) Organic Chemistry Principles and Industrial Practice Weinheim (Germania): Wiley p. 170 ISBN 978-3-527-30289-5
- ↑ Louie, Douglas K. (2005) Handbook of sulphuric acid manufacturing Richmond Hill (Canada): DKL Engineering, Inc. pp. 16–116 ISBN 978-0-9738992-0-7