Yiziphi izici zerabha ye-EPDM?

1. Ukuminyana okuphansi kanye nokugcwalisa okuphezulu
Irabha ye-ethylene-propylene iyirabha enobukhulu obuphansi, enobukhulu obungu-0.87. Ngaphezu kwalokho, ingagcwaliswa ngenani elikhulu lamafutha kanye ne-EPDM.
Ukwengeza ama-filler kunganciphisa izindleko zemikhiqizo yerabha futhi kulungise intengo ephezulu yerabha eluhlaza yerabha ye-ethylene propylene. Kurabha ye-ethylene propylene enenani eliphezulu leMooney, amandla angokomzimba nawomshini wokugcwalisa okuphezulu awanciphi kakhulu.

2. Ukumelana nokuguga
Irabha ye-ethylene-propylene inokumelana okuhle kakhulu nesimo sezulu, ukumelana ne-ozone, ukumelana nokushisa, ukumelana ne-asidi ne-alkali, ukumelana nomhwamuko wamanzi, ukuqina kombala, izakhiwo zikagesi, izakhiwo zokugcwalisa uwoyela kanye nokugeleza ekushiseni kwegumbi. Imikhiqizo yerabha ye-ethylene-propylene ingasetshenziswa isikhathi eside ku-120°C, futhi ingasetshenziswa isikhashana noma ngezikhathi ezithile ku-150-200°C. Ukwengeza ama-antioxidants afanele kungandisa izinga lokushisa lokusetshenziswa kwayo. Irabha ye-EPDM exhunywe nge-peroxide ingasetshenziswa ngaphansi kwezimo ezinzima. Irabha ye-EPDM ingafinyelela amahora angaphezu kwangu-150 ngaphandle kokuqhekeka ngaphansi kwezimo zokuhlushwa kwe-ozone okungu-50pphm kanye nokwelulwa okungu-30%.

3. Ukumelana nokugqwala
Ngenxa yokuthi irabha ye-ethylene propylene ayinayo i-polarity kanye nezinga eliphansi lokungagcwali, inokumelana okuhle namakhemikhali ahlukahlukene e-polar afana nama-alcohol, ama-acid, ama-alkali, ama-oxidants, ama-refrigerant, ama-detergents, uwoyela wezilwane nemifino, ama-ketones namafutha. Kodwa ayinakho ukuzinza okuhle kuma-solvents anamafutha namakha (njengephethiloli, i-benzene, njll.) kanye namafutha amaminerali. Ukusebenza kuzoncipha futhi ngaphansi kwesenzo sesikhathi eside se-acid egxilile. Ku-ISO/TO 7620, cishe izinhlobo ezingu-400 zamakhemikhali e-gaseous kanye noketshezi aqoqe ulwazi ngezakhiwo ezahlukene zerabha, futhi yacacisa amazinga angu-1-4 ukukhombisa izinga lawo lokusebenza, kanye nomthelela wamakhemikhali a-corrosive ezimpahleni zerabha.

Ivolumu Yebanga Izinga lokuvuvukala/% Inani lokunciphisa ukuqina Umthelela ekusebenzeni kahle
1 <10 <10 okuncane noma cha
2 10-20 <20 ezincane
3 30-60 <30 okuphakathi
4 >60 >30 okunzima

4. Ukumelana nomhwamuko wamanzi
Irabha ye-ethylene-propylene inokumelana okuhle kakhulu nomhwamuko wamanzi futhi kulinganiselwa ukuthi ingcono kunokumelana kwayo nokushisa. Ku-230℃ umusi oshisiwe kakhulu, ukubonakala kwe-EPDM akushintshanga ngemva kwamahora acishe abe yi-100. Kodwa-ke, ngaphansi kwezimo ezifanayo, irabha ye-fluorine, irabha ye-silicone, irabha ye-fluorosilicone, irabha ye-butyl, irabha ye-nitrile, kanye nerabha yemvelo kwabhekana nokuwohloka okukhulu kokubukeka ngemva kwesikhathi esifushane.

5. Ukumelana namanzi ashisayo kakhulu
Irabha ye-ethylene-propylene nayo inokumelana okungcono namanzi ashisayo kakhulu, kodwa ihlobene eduze nazo zonke izinhlelo ze-vulcanization. Irabha ye-ethylene-propylene ene-dimorpholine disulfide kanye ne-TMTD njengohlelo lwe-vulcanization, ngemva kokucwiliswa emanzini ashisayo kakhulu ku-125°C izinyanga ezingu-15, izakhiwo zemishini zishintsha kancane kakhulu, futhi izinga lokukhulisa ivolumu lingu-0.3% kuphela.

6. Ukusebenza kukagesi
Irabha ye-ethylene-propylene inezakhiwo ezinhle kakhulu zokuvikela ugesi kanye nokumelana ne-corona, futhi izakhiwo zayo zikagesi zingcono noma ziseduze nezerabha ye-styrene-butadiene, i-polyethylene e-chlorosulfonated, i-polyethylene kanye ne-polyethylene exhumene.

7. Ukuzivumelanisa nezimo
Ngenxa yokuthi azikho izinto ezithatha indawo ye-polar esakhiweni sama-molecule enjoloba ye-ethylene-propylene, amandla ahlangene e-molecule aphansi, futhi uchungechunge lwama-molecule lungagcina ukuguquguquka okubanzi, okwesibili kuphela kunenjoloba yemvelo exoxisanayo ne-butadiene, futhi lungagcinwa emazingeni okushisa aphansi.

8. Ukunamathela
Irabha ye-ethylene-propylene ayinawo amaqembu asebenzayo ngenxa yesakhiwo sayo sama-molecule futhi inamandla amancane okuhlangana. Ngaphezu kwalokho, irabha kulula ukuyiqhakaza, futhi ukuzinamathela kwayo kanye nokunamathelana kwayo kuphansi kakhulu.