Ethylene-propylene roj hmab yog derived ntawm copolymerization yas monomer thiab propylene li raws li lub ntsiab orientation. Nws muaj ob ethylene-propylene roj hmab (EPM) thiab ob hom EPDM roj hmab (EPDM).
EPM ua los ntawm ethylene thiab propylene 20% copolymerization ~ 30%. Qhov tseem ceeb nyob hauv cov saw hlau nws yog saturated rubbers. Tsis nrog leej faj tua, tsuas siv tau peroxide Crosslinking. Slow tua, tua tus neeg saib xyuas ntawm koj txwv cov ntaub ntawv.
EPDM yog tswvcuab hauv ethylene-propylene copolymers ntawm unsaturated monomers III. Xws li: cov yas norbornene coj cyclopentadiene. Qhov leej faj tua, xwm yog zoo li EPM. Muaj cov ncov qaumteb qabteb substituent, uas tsis yog-crystalline, tus kwv tij ceev 0.86 ~ 0.88.
1, cov laus yav tom ntej kuj. Nws kuj taus dua roj hmab butyl thiab CR. Good huab cua ua hauj, cracks tshav tau 3 xyoos. Nrib pleb speed, SBR5 hnub NR150 hnub, 70 hnub so. Kuj zoo rau cov laus. 150 ℃ siv mus sij hawm ntev. Ageing kuj yog cov cov roj hmab ntsiab zoo tshaj.
2, kuj mus tshuaj corrosion. Ntau yam tshuaj ncov qaumteb qabteb thiab txhuam cov acids, alkalis muaj ib lub siab qhov chaw ua hauj lwm. Kuj tsis rau roj hydrocarbon.
3, yav tom ntej hluav taws xob rwb thaiv tsev. Ntau dua butyl roj hmab, tsim rau 45 ~ 65KW ntawm kev kub siab.
4, poob siab zoo thiab no. Thaws dhia li 50% ~ 60%, tom qab lub NR and BR, elasticity tsis sov kom zoo kawm-57 tartar, nkig-77 ℃.
Disadvantages: slower tua tus nqi () 3 rau 4 zaug zaug dua li qeeb qeeb. Lwm cov roj hmab unsaturated thiab yooj yim; kev txom nyem qhov nplaum thiab kev sib nrig sib nplaum thiab nplaum yooj yim, tsis zoo ua.
Tiam sis nws yog ib qho yooj yim, pheej yig, mas siv hauv hose, ntaub, accessories automotive, xws li cov cables thiab nyob ntawm tej.
