Taw qhia rau EPDM
EPDM yog terpolymer ntawm ethylene, propylene thiab non-conjugated dienes, uas tau pib ua lag luam hauv xyoo 1963. Kev noj txhua xyoo hauv ntiaj teb yog 800000 tons.Lub ntsiab yam ntxwv ntawm EPDM yog nws superior oxidation kuj, ozone kuj thiab corrosion kuj.Raws li EPDM belongs rau tsev neeg polyolefin (PO), nws muaj vulcanization zoo heev.Ntawm tag nrho cov roj hmab, EPDM muaj qhov tshwj xeeb lub ntiajteb txawj nqus qis tshaj plaws thiab tuaj yeem nqus tau ntau cov khoom ntim thiab roj yam tsis muaj kev cuam tshuam rau cov khoom.Yog li ntawd, nws tuaj yeem tsim cov khoom siv roj hmab uas tsis muaj nqi.
Kev ua tau zoo
- Tsawg ceev thiab siab filling
Ethylene-propylene roj hmab muaj qhov ntom ntom ntawm 0.87.Tsis tas li ntawd, cov roj ntau ntau tuaj yeem sau thiab tus neeg sawv cev filling tuaj yeem ntxiv, uas tuaj yeem txo tus nqi ntawmcov khoom siv roj hmab, ua rau qhov tsis txaus ntawm tus nqi siab ntawm EPDM raw roj hmab, thiab rau EPDM nrog tus nqi Mooney siab, lub zog ntawm lub cev thiab txhua yam tom qab siab filling tsis txo qis.
- Kev laus tsis kam
Ethylene-propylene roj hmab muaj huab cua zoo heev, ozone tsis kam, kub tsis kam, acid thiab alkali tsis kam, dej vapor tsis kam, xim stability, hluav taws xob khoom, roj filling thiab kub fluidity.Ethylene-propylene roj hmab cov khoom tuaj yeem siv rau lub sijhawm ntev ntawm 120 ℃, thiab tuaj yeem siv tau ib ntus lossis cuam tshuam ntawm 150 - 200 ℃.Kev siv kub tuaj yeem nce ntxiv los ntawm kev ntxiv cov tshuaj tiv thaiv antioxidant.EPDM crosslinked nrog peroxide yuav siv tau nyob rau hauv hnyav tej yam kev mob. Nyob rau hauv lub mob ntawm ozone concentration ntawm 50 pphm thiab stretch ntawm 30%, EPDM tsis tuaj yeem tawg rau ntau tshaj 150 h.
- Corrosion kuj
Vim tsis muaj polarity thiab tsis tshua muaj unsaturation ntawm ethylene-propylene roj hmab, nws muaj zoo tiv thaiv ntau yam polar tshuaj xws li cawv, acid, alkali, oxidant, refrigerant, detergent, tsiaj thiab zaub roj, ketone thiab roj;Txawm li cas los xij, nws muaj kev ruaj ntseg tsis zoo hauv aliphatic thiab cov kuab tshuaj tsw qab (xws li roj av, benzene, thiab lwm yam) thiab cov roj ntxhia.Nyob rau hauv lub sij hawm ntev kev txiav txim ntawm concentrated acid, qhov kev ua tau zoo kuj yuav poob.
- Dej vapor tsis kam
EPDM muaj dej vapor kuj zoo heev thiab kwv yees tias yuav ua tau zoo dua rau nws cov cua sov.Hauv 230 ℃ superheated chav, tsis muaj qhov hloov pauv hauv qhov tsos tom qab ze li 100 teev.Txawm li cas los xij, nyob rau hauv tib lub sijhawm, fluorine roj hmab, silicon roj hmab, fluorosilicone roj hmab, butyl roj hmab, nitrile roj hmab thiab cov roj hmab ntuj tau ntsib pom kev tsis zoo nyob rau hauv lub sijhawm luv luv.
- Kub dej tsis kam
Ethylene-propylene roj hmab kuj muaj kev tiv thaiv zoo rau cov dej superheated, tab sis nws muaj feem cuam tshuam nrog txhua lub tshuab kho.Cov khoom siv kho tshuab ntawm ethylene-propylene roj hmab nrog morpholine disulfide thiab TMTD raws li kev kho qhov system hloov me ntsis tom qab soaking hauv 125 ℃ superheated dej rau 15 lub hlis, thiab qhov ntim nthuav dav tsuas yog 0.3%.
- Kev ua haujlwm hluav taws xob
Ethylene-propylene roj hmab muaj cov rwb thaiv tsev zoo heev thiab corona tiv thaiv, thiab nws cov khoom siv hluav taws xob zoo dua los yog ze rau cov roj hmab styrene-butadiene, chlorosulfonated polyethylene, polyethylene thiab cross-linked polyethylene.
- Elasticity
Vim tias tsis muaj cov polar hloov pauv hauv cov qauv molecular ntawm ethylene-propylene roj hmab thiab lub zog molecular cohesion qis, cov saw molecular tuaj yeem tswj tau yooj yim hauv ntau yam, thib ob tsuas yog cov roj hmab ntuj thiab cis-polybutadiene roj hmab, thiab tseem tuaj yeem tswj tau ntawm kub kub.
- Adhesion
Vim tsis muaj active pab pawg nyob rau hauv lub molecular qauv ntawmethylene-propylene roj hmab, tsis tshua muaj zog cohesion, thiab yooj yim frost txau ntawm roj hmab compound, tus kheej-adhesion thiab kev sib nrig sib adhesion yog heev tsis zoo.
Qhov zoo
- Nws muaj qhov ua tau zoo-nqi piv.Qhov ceev ntawm cov roj hmab nyoos tsuas yog 0.86 ~ 0.90g / cm3, uas yog cov roj hmab ntau tshaj plaws nrog lub lightest ntom ntawm cov roj hmab nyoos;Nws kuj tseem tuaj yeem ua rau ntau qhov ntau los txo cov nqi ntawm cov roj hmab sib xyaw.
- Kev laus zoo heev, huab cua tsis kam, ozone kuj, tshav ntuj tiv thaiv, tshav kub tsis kam, dej tsis kam, dej vapor tsis kam, UV tsis kam, hluav taws xob tiv thaiv thiab lwm yam kev laus.Thaum siv nrog lwm cov roj hmab uas tsis muaj roj xws li NR, SBR, BR, NBR, thiab CR, EPDM tuaj yeem ua lub luag haujlwm ntawm polymer antioxidant lossis antioxidant.
- Cov tshuaj tiv thaiv zoo heev, acid, alkali, xab npum, tsiaj thiab zaub roj, cawv, ketone, thiab lwm yam;Zoo heev tiv thaiv dej, superheated dej thiab chav;Ua tsis taus pa roj.
- Kev ua haujlwm zoo rwb thaiv tsev, ntim resistivity 1016Q · cm, tawg voltage 30-40MV / m, dielectric tas li (1kHz, 20 ℃) 2.27.
- Nws muaj feem xyuam rau ntau yam ntawm qhov kub thiab txias, nrog rau qhov ntsuas kub tsawg kawg nkaus ntawm - 40 ~ - 60 ℃, thiab tuaj yeem siv tau ntawm 130 ℃ ntev.
Post lub sij hawm: Jan-10-2023
