Ntuj Roj Hmab
Ua los ntawm latex sau los ntawm cov ntoo roj hmab, nws yog ib tug polymer ntawm isoprene. Nws muaj cov yam ntxwv ntawm kev ua haujlwm siab, siab elasticity, tensile zog, thiab elongation. Nws muaj hnub nyoog yooj yim hauv huab cua, ua nplaum thaum cua sov, thiab yooj yim swells thiab yaj hauv cov roj ntxhia lossis roj av. Nws yog alkali-resistant tab sis tsis muaj zog acid-resistant. Qhov zoo: Zoo elasticity, acid thiab alkali tsis kam.
Styrene-Butadiene Roj Hmab
Ib copolymer ntawm butadiene thiab styrene. Piv nrog rau cov roj hmab ntuj, nws muaj qhov zoo sib xws, tsawg impurities, thiab kev puas tsuaj zoo dua thiab kev laus ua haujlwm, tab sis nws lub zog txhua yam tsis muaj zog. Nws tuaj yeem sib xyaw nrog cov roj hmab ntuj.
Butyl Roj Hmab
Nws yog ib qho polymer ntawm isobutylene thiab ib qho me me ntawm isoprene. Vim yog qhov steric hindrance ntawm pawg methyl, cov molecular motion yog tsawg dua nyob rau hauv lwm cov polymers, ua rau cov roj permeability qis. Nws muaj kev tiv thaiv siab rau tshav kub, tshav ntuj, thiab ozone, thiab zoo heev hluav taws xob rwb thaiv tsev. Nws kuj tseem muaj kev tiv thaiv siab rau polar solvents. Qhov kev khiav hauj lwm kub yog -54 txog 110 degree. Qhov zoo: impermeable rau feem ntau cov pa roj, zoo tiv thaiv tshav ntuj thiab tsw, thiab tuaj yeem raug rau tsiaj lossis zaub roj lossis tshuaj vaporizable.
Hydrogenated Nitrile Roj Hmab
Hydrogenated nitrile roj hmab yog nitrile roj hmab uas tau undergone hydrogenation tshem tawm ib co ntawm ob chains. Tom qab hydrogenation, nws qhov kub thiab txias tsis kam thiab huab cua tiv thaiv tau zoo dua piv rau cov roj hmab nitrile zoo tib yam, thaum nws cov roj kuj zoo sib xws. Kev khiav hauj lwm kub yog -25 txog 150 degree. Qhov zoo: Nws muaj kev ua kom zoo dua qub dua li cov roj hmab nitrile zoo tib yam thiab zoo heev tiv thaiv corrosion, nro, tearing, thiab compression.
Ethylene -propylene roj hmab (EPDM)
Ua los ntawm copolymerization ntawm ethylene thiab propylene, nws nthuav tawm cov cua sov zoo, kev laus ua haujlwm, ozone tsis kam, thiab ruaj khov. Txawm li cas los xij, nws tsis tuaj yeem ua sulfurized. Yuav kom daws tau qhov teeb meem no, ib qho me me ntawm ib feem peb nrog ob txoj hlua khi yog nkag rau hauv EP lub ntsiab saw, tso cai rau sulfurization thiab yog li tsim EPDM. Nws qhov kev khiav hauj lwm kub yog -50 ~ 150℃. Nws muaj kev tiv thaiv zoo rau cov kuab tshuaj polar xws li cawv thiab ketones. Qhov zoo: huab cua tsis zoo thiab ozone tsis kam; zoo heev dej thiab tshuaj tiv thaiv; tuaj yeem siv nrog cawv thiab ketones; resistant rau high-kub vapors; thiab zoo heev impermeability rau gases.
Nitrile roj hmab (Nubryl butadiene roj hmab)
Ua los ntawm copolymerization ntawm acrylonitrile thiab butadiene, nrog rau cov ntsiab lus acrylonitrile li ntawm 18% mus rau 50%. Cov ntsiab lus acrylonitrile siab dua ua rau muaj kev tiv thaiv zoo dua rau cov roj petrochemical thiab cov roj hydrocarbon roj, tab sis qis dua - qhov kub thiab txias. Nws qhov kev khiav hauj lwm kub yog -25 ~ 100℃. Nitrile roj hmab yog ib qho ntawm cov roj hmab feem ntau siv rau cov roj foob thiab O{10}}rings. Qhov zoo: Kev ua haujlwm zoo rau cov roj, dej, cov kuab tshuaj, thiab cov roj muaj zog. Zoo compressibility, abrasion tsis kam, thiab elongation.
Cycloprene roj hmab
Ua los ntawm chloroprene monomers. Tom qab vulcanization, cov roj hmab muaj elasticity zoo thiab abrasion tsis kam, tsis ntshai ntawm tshav ntuj ncaj qha, muaj huab cua zoo heev, tsis ntshai ntawm qhov torsion loj, tsis ntshai cov tub yees, thiab tiv taus cov kua qaub thiab silicone ester lubricants, tab sis tsis tiv taus phosphate ester hydraulic roj. Nws yooj yim crystallizes thiab hardens ntawm qhov kub thiab txias, tsis zoo cia ruaj khov, thiab nthuav dav hauv cov roj ntxhia nrog cov ntsiab lus aniline tsawg. Kev khiav hauj lwm kub ntau yog -50 ~ 150℃. Qhov zoo: Zoo elasticity thiab compression teeb; sulfur-dawb formulation ua rau nws yooj yim heev los tsim; resistant rau tsiaj thiab zaub roj, thiab nws cov khoom tsis cuam tshuam los ntawm cov tshuaj nruab nrab, rog, roj, ntau yam roj, thiab cov kuab tshuaj; nplaim-retardant khoom.
Kev sib xyaw ntawm Synthetic Rubber
Synthetic roj hmab yog ib tug polymer ua los ntawm polymerizing roj av thiab natural gas li raw cov ntaub ntawv thiab dienes thiab olefins li monomers.