Cov khoom siv roj hmab-EPDM tus yam ntxwv
Qhov zoo:
Kev laus zoo heev, huab cua tsis kam, hluav taws xob rwb thaiv tsev, tshuaj tiv thaiv corrosion thiab cuam tshuam elasticity.
Qhov tsis zoo:
qeeb curing ceev; Nws yog ib qho nyuaj rau kev sib xyaw nrog lwm cov roj hmab tsis sib xws, thiab kev sib txuas ntawm tus kheej thiab kev sib koom ua ke yog qhov tsis zoo, yog li kev ua haujlwm tsis zoo.
Ningbo Yokey Automotive Parts Co., Ltd tsom rau kev daws cov neeg siv khoom 'cov teeb meem ntawm cov khoom siv roj hmab thiab tsim cov ntaub ntawv sib txawv raws li qhov sib txawv ntawm daim ntawv thov scenarios.
Khoom: lus qhia
1. Tsawg ceev thiab siab filling
Ethylene propylene roj hmab yog ib hom roj hmab nrog qhov ntom ntom ntawm 0.87. Tsis tas li ntawd, cov roj ntau tuaj yeem muab ntim thiab muab cov khoom ntim ntxiv, uas tuaj yeem txo cov nqi ntawm cov khoom siv roj hmab thiab ua rau cov nqi siab ntawm cov roj hmab roj hmab ntawm ethylene propylene roj hmab. Tsis tas li ntawd, rau cov roj hmab ethylene propylene nrog cov nqi siab Mooney, lub zog ntawm lub cev thiab cov tshuab ua haujlwm tom qab siab filling yuav tsis raug txo los ntawm ntau.
2. Kev laus tsis kam
Ethylene propylene roj hmab muaj cov huab cua zoo heev, ozone tsis kam, kub tsis kam, acid thiab alkali tsis kam, dej vapor tsis kam, xim stability, hluav taws xob ua haujlwm, roj filling thiab chav dej fluidity. Cov khoom siv roj hmab ethylene propylene tuaj yeem siv tau ntev ntawm 120 ℃, thiab tuaj yeem siv luv luv lossis sib nrug ntawm 150 - 200 ℃. Kev siv kub tuaj yeem nce ntxiv los ntawm kev ntxiv cov tshuaj tiv thaiv antioxidant. EPDM crosslinked nrog peroxide tuaj yeem siv rau hauv cov xwm txheej hnyav. Thaum ozone concentration ntawm EPDM yog 50 ppm thiab lub sij hawm ncab yog 30%, EPDM tuaj yeem ncav cuag 150 h yam tsis muaj kev tawg.
3. 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 cov roj ntsha thiab cov tshuaj tsw qab (xws li roj av, benzene, thiab lwm yam) thiab cov roj ntxhia. Qhov kev ua tau zoo kuj tseem yuav poob qis raws li kev ua haujlwm ntev ntawm cov concentrated acid. Hauv ISO / TO 7620, cov ntaub ntawv ntawm cov teebmeem ntawm ze li ntawm 400 corrosive gaseous thiab kua tshuaj ntawm cov khoom ntawm ntau yam roj hmab tau sau, thiab qib 1-4 tau teev tseg los qhia txog lawv cov teebmeem. Cov teebmeem ntawm cov tshuaj corrosive ntawm cov khoom ntawm rubbers yog raws li nram no:
Cov nyhuv ntawm Qib Volume Swelling Rate /% Hardness txo ntawm cov khoom
1 < 10 < 10 me ntsis los yog tsis muaj
2 10-20 <20 me me
3 30-60 < 30 Nruab nrab
4> 60> 30 loj
4. Dej vapor tsis kam
EPDM muaj lub zog ua haujlwm zoo heev thiab kwv yees kom zoo dua rau nws cov cua sov ua haujlwm. Hauv 230 ℃ superheated chav, qhov tsos tsis hloov tom qab ze li 100 teev. Txawm li cas los xij, nyob rau hauv tib lub sijhawm, cov tsos ntawm fluorine roj hmab, silicon roj hmab, fluorosilicone roj hmab, butyl roj hmab, nitrile roj hmab thiab ntuj roj hmab deteriorated tseem ceeb nyob rau hauv ib lub sij hawm luv luv.
5. Resistance rau superheated dej
Ethylene propylene roj hmab kuj muaj kev tiv thaiv zoo rau cov dej superheated, tab sis nws muaj feem xyuam nrog txhua lub tshuab vulcanization. Cov khoom siv hluav taws xob ntawm ethylene propylene roj hmab (EPR) vulcanized nrog dimorphine disulfide thiab TMTD tau hloov me ntsis tom qab muab tso rau hauv 125 ℃ superheated dej rau 15 lub hlis, thiab qhov ntim nthuav dav tsuas yog 0.3%.
6. Kev ua haujlwm hluav taws xob
Ethylene propylene roj hmab muaj hluav taws xob rwb thaiv tsev zoo heev thiab tiv thaiv corona, thiab nws cov khoom hluav taws xob zoo dua los yog ze rau cov roj hmab styrene butadiene, chlorosulfonated polyethylene, polyethylene thiab cross-linked polyethylene.
7. elasticity
Vim tias cov roj hmab ethylene propylene tsis muaj cov khoom siv polar nyob rau hauv nws cov qauv molecular thiab tsis tshua muaj molecular cohesion zog, nws cov saw molecular muaj peev xwm tswj tau yooj yim nyob rau hauv ntau yam, thib ob tsuas yog cov roj hmab ntuj thiab cis polybutadiene roj hmab, thiab tseem tuaj yeem tswj tau ntawm qhov kub thiab txias.
8. Adhesion
Vim tias tsis muaj cov pab pawg muaj zog hauv cov qauv molecular ntawm ethylene propylene roj hmab, lub zog cohesion yog tsawg, thiab cov roj hmab yooj yim rau tshuaj tsuag, yog li nws tus kheej adhesion thiab kev sib nrig sib adhesion yog qhov tsis zoo.
Post lub sij hawm: Oct-10-2022