Yini oyaziyo nge-EPDM?

Isingeniso ku-EPDM

I-EPDM iyi-terpolymer ye-ethylene, i-propylene kanye ne-non-conjugated dienes, eyaqala ukukhiqizwa kwezentengiselwano ngo-1963. Ukusetshenziswa konyaka komhlaba ngamathani angu-800000. Isici esiyinhloko se-EPDM ukumelana kwayo ne-oxidation ephakeme, ukumelana ne-ozone nokumelana nokugqwala. Njengoba i-EPDM iyingxenye yomndeni we-polyolefin (PO), inezinto ezinhle kakhulu ze-vulcanization. Phakathi kwawo wonke ama-rubber, i-EPDM ine-gravity ethize ephansi kakhulu futhi ingamunca inani elikhulu lama-filler namafutha ngaphandle kokuthinta izakhiwo. Ngakho-ke, ingakhiqiza izinhlanganisela zenjoloba ezingabizi kakhulu.

Ukusebenza

• Ukuminyana okuphansi nokugcwalisa okuphezulu

Irabha ye-ethylene-propylene ine-density ephansi ye-0.87. Ngaphezu kwalokho, inani elikhulu lamafutha lingagcwaliswa futhi i-ejenti yokugcwalisa ingafakwa, enganciphisa izindlekoimikhiqizo yenjoloba, yenza ukushiyeka kwenani eliphezulu le-EPDM irabha eluhlaza, kanye ne-EPDM enenani eliphakeme le-Mooney, amandla angokwenyama kanye nemishini ngemva kokugcwalisa okuphezulu awancishiswa kakhulu.

• Ukumelana nokuguga

Irabha ye-ethylene-propylene inokumelana nesimo sezulu esihle kakhulu, ukumelana ne-ozone, ukumelana nokushisa, ukumelana ne-asidi ne-alkali, ukumelana nomhwamuko wamanzi, ukuzinza kombala, izakhiwo zikagesi, ukugcwaliswa kwamafutha kanye nokushisa okuvamile.Imikhiqizo yerabha ye-ethylene-propylene ingasetshenziswa isikhathi eside ku-120 ℃, futhi ingasetshenziswa okwesikhashana noma ngezikhathi ezithile ku-150 - 200 ℃. Izinga lokushisa lokusebenzisa linganyuswa ngokungeza i-antioxidant efanelekile. I-EPDM exhunywe nge-peroxide ingasetshenziswa ngaphansi kwezimo ezinzima.Ngaphansi kwesimo sokuhlushwa kwe-ozone ye-50 phm kanye nokwelula kwe-30%, i-EPDM ayikwazi ukuqhekeka isikhathi esingaphezu kwe-150 h.

• Ukumelana nokugqwala

Ngenxa yokuntuleka kwe-polarity kanye ne-unsaturation ephansi yerabha ye-ethylene-propylene, inokumelana okuhle namakhemikhali e-polar ahlukahlukene njengotshwala, i-asidi, i-alkali, i-oxidant, isiqandisi, okokuhlanza, amafutha ezilwane nemifino, i-ketone namafutha; Kodwa-ke, inokungaqini kahle kwezinyibilikisi ze-aliphatic nezinephunga elimnandi (ezifana nophethiloli, benzene, njll.) namafutha amaminerali. Ngaphansi kwesenzo sesikhathi eside se-asidi egxilile, ukusebenza kuzokwehla.

• Ukumelana nomhwamuko wamanzi

I-EPDM inokumelana okuhle kakhulu nomhwamuko wamanzi futhi kulinganiselwa ukuthi iphakeme kunokumelana nokushisa kwayo. Ku-230 ℃ umusi oshisa kakhulu, alukho ushintsho ekubukekeni ngemva cishe kwamahora angu-100. Kodwa-ke, ngaphansi kwezimo ezifanayo, irabha ye-fluorine, irabha ye-silicon, iraba ye-fluorosilicone, irabha ye-butyl, irabha ye-nitrile nerabha yemvelo kwaba nokuwohloka okusobala ekubukekeni ngesikhathi esifushane uma kuqhathaniswa.

• Ukumelana namanzi ashisayo

Irabha ye-ethylene-propylene nayo inokumelana okuhle namanzi ashisayo, kodwa ihlobene eduze nazo zonke izinhlelo zokuphulukisa. Izakhiwo zemishini yerabha ye-ethylene-propylene ene-morpholine disulfide kanye ne-TMTD njengesistimu yokwelapha yashintsha kancane ngemva kokucwiliswa emanzini ashisayo angu-125 ℃ izinyanga ezingu-15, futhi izinga lokunwetshwa kwevolumu lalingu-0.3 kuphela%.

• Ukusebenza kukagesi

Irabha ye-ethylene-propylene ine-insulation kagesi enhle kakhulu kanye nokumelana ne-corona, futhi izakhiwo zayo zikagesi ziphakeme noma zisondele kunezo zenjoloba ye-styrene-butadiene, i-chlorosulfonated polyethylene, i-polyethylene kanye ne-polyethylene ehlangene.

• I-Elasticity

Ngenxa yokuthi ayikho i-polar substituent esakhiweni samangqamuzana enjoloba ye-ethylene-propylene futhi amandla okuhlangana kwamangqamuzana aphansi, uchungechunge lwamangqamuzana lungakwazi ukugcina ukuguquguquka kwezinto ezihlukahlukene, okwesibili kuphela kwerabha yemvelo kanye nerabha ye-cis-polybutadiene, futhi isengakwazi ukugcina izinga lokushisa eliphansi.

• Ukunamathela

Ngenxa yokuntuleka kwamaqembu asebenzayo esakhiweni samangqamuzanairabha ethylene-propylene, amandla okubumbana aphansi, kanye nokufuthwa kwesithwathwa okulula kwenhlanganisela yenjoloba, ukuzihlanganisa nokunamathelana kubi kakhulu.

Inzuzo

• Inesilinganiso sokusebenza-intengo ephezulu. Ubuningi benjoloba eluhlaza bungu-0.86 ~ 0.90g/cm3 kuphela, okuyirabha ejwayeleke kakhulu enobuningi obulula berabha eluhlaza; Ingabuye igcwaliswe ngobuningi ukuze kuncishiswe izindleko zenhlanganisela yenjoloba.
• Ukumelana nokuguga okuhle kakhulu, ukumelana nesimo sezulu, ukumelana ne-ozone, ukumelana nokukhanya kwelanga, ukumelana nokushisa, ukumelana namanzi, ukumelana nomhwamuko wamanzi, ukumelana ne-UV, ukumelana nemisebe nezinye izici zokuguga. Uma isetshenziswa nenye irabha ye-diene engafakwanga njenge-NR, SBR, BR, NBR, ne-CR, i-EPDM ingadlala indima ye-polymer antioxidant noma i-antioxidant.
• Ukumelana okuhle kwamakhemikhali, i-asidi, i-alkali, okokuhlanza, amafutha ezilwane nemifino, utshwala, i-ketone, njll; Ukumelana okuhle kakhulu kwamanzi, amanzi ashisayo kanye nesitimu; Ukumelana nowoyela we-polar.
• Ukusebenza okuhle kakhulu kokufakwa kwe-insulation, ukumelana nevolumu 1016Q · cm, i-voltage yokuphuka 30-40MV/m, i-dielectric constant (1kHz, 20 ℃) ​​2.27.
• Isebenza ezinhlobonhlobo zamazinga okushisa, nezinga lokushisa elincane lokusebenza elingu-40~-60 ℃, futhi lingasetshenziswa ku-130 ℃ isikhathi eside.