Cov ntaub ntawv roj hmab feem ntau - EPDM tus yam ntxwv
Qhov Zoo:
Kev tiv thaiv kev laus zoo heev, tiv taus huab cua, rwb thaiv hluav taws xob, tiv taus tshuaj lom neeg thiab cuam tshuam elasticity.
Qhov Tsis Zoo:
Kev kho qeeb qeeb; Nws nyuaj rau sib xyaw nrog lwm cov roj hmab tsis muaj roj, thiab qhov kev nplaum tus kheej thiab kev sib txuas ua ke tsis zoo heev, yog li kev ua haujlwm tsis zoo.
Ningbo Yokey Automotive Parts Co., Ltd tsom mus rau kev daws cov teeb meem roj hmab ntawm cov neeg siv khoom thiab tsim cov qauv sib txawv raws li cov xwm txheej sib txawv.
Cov Khoom: cov ntsiab lus
1. Qhov ceev tsawg thiab kev sau siab
Roj hmab ethylene propylene yog ib hom roj hmab uas muaj qhov ceev qis dua 0.87. Tsis tas li ntawd, ntau cov roj tuaj yeem sau thiab ntxiv cov khoom sau, uas tuaj yeem txo cov nqi ntawm cov khoom roj hmab thiab ua rau tus nqi siab ntawm cov roj hmab nyoos ntawm roj hmab ethylene propylene. Tsis tas li ntawd, rau roj hmab ethylene propylene uas muaj Mooney nqi siab, lub zog lub cev thiab lub tshuab tom qab sau siab yuav tsis raug txo ntau.
2. Kev laus tiv taus
Cov roj hmab ethylene propylene muaj kev tiv thaiv huab cua zoo heev, tiv thaiv ozone, tiv thaiv kub, tiv thaiv acid thiab alkali, tiv thaiv dej pa, xim ruaj khov, kev ua haujlwm hluav taws xob, roj sau thiab kub hauv chav. Cov khoom roj hmab ethylene propylene siv tau ntev ntawm 120 ℃, thiab siv tau luv luv lossis tsis tu ncua ntawm 150 - 200 ℃. Qhov kub siv tuaj yeem nce ntxiv los ntawm kev ntxiv cov tshuaj antioxidant tsim nyog. EPDM crosslinked nrog peroxide tuaj yeem siv rau hauv cov xwm txheej hnyav. Thaum qhov concentration ozone ntawm EPDM yog 50 pphm thiab lub sijhawm ncab yog 30%, EPDM tuaj yeem ncav cuag 150 teev yam tsis tawg.
3. Kev tiv thaiv xeb
Vim tsis muaj polarity thiab qis unsaturation ntawm ethylene propylene roj hmab, nws muaj kev tiv thaiv zoo rau ntau yam tshuaj polar xws li cawv, kua qaub, alkali, oxidant, refrigerant, detergent, tsiaj thiab zaub roj, ketone thiab roj; Txawm li cas los xij, nws muaj kev ruaj khov tsis zoo hauv cov roj thiab aromatic solvents (xws li roj av, benzene, thiab lwm yam) thiab cov roj av. Kev ua tau zoo kuj tseem yuav poob qis nyob rau hauv kev ua haujlwm ntev ntawm concentrated acid. Hauv ISO / TO 7620, cov ntaub ntawv ntawm cov teebmeem ntawm yuav luag 400 corrosive gaseous thiab kua tshuaj rau cov khoom ntawm ntau yam roj hmab tau sau, thiab qib 1-4 tau teev tseg los qhia lawv cov teebmeem. Cov teebmeem ntawm corrosive tshuaj rau cov khoom ntawm roj hmab yog raws li nram no:
Cov Nyhuv ntawm Qib Ntim Swelling Rate /% Hardness Reduction rau Cov Khoom
1<10<10 Me ntsis los yog tsis muaj li
2 10-20<20 me dua
3 30-60<30 Nruab Nrab
4>60>30 loj heev
4. Kev tiv thaiv dej ua pa
EPDM muaj kev tiv thaiv pa zoo heev thiab kwv yees tias zoo dua li nws qhov kev tiv thaiv cua sov. Hauv 230 ℃ superheated pa, qhov tsos tsis hloov tom qab yuav luag 100 teev. Txawm li cas los xij, nyob rau hauv tib qho xwm txheej, qhov tsos ntawm fluorine roj hmab, silicon roj hmab, fluorosilicone roj hmab, butyl roj hmab, nitrile roj hmab thiab roj hmab ntuj tsim tau poob qis heev hauv lub sijhawm luv luv.
5. Kev tiv thaiv rau cov dej kub heev
Cov roj hmab ethylene propylene kuj muaj kev tiv thaiv zoo rau cov dej kub heev, tab sis nws muaj feem cuam tshuam nrog txhua lub tshuab vulcanization. Cov khoom siv kho tshuab ntawm ethylene propylene roj hmab (EPR) vulcanized nrog dimorphine disulfide thiab TMTD tsis hloov pauv me ntsis tom qab raug raus hauv 125 ℃ dej kub heev rau 15 lub hlis, thiab qhov ntim nthuav dav tsuas yog 0.3%.
6. Kev ua haujlwm hluav taws xob
Cov roj hmab ethylene propylene muaj kev rwb thaiv hluav taws xob zoo heev thiab tiv taus corona, thiab nws cov khoom hluav taws xob zoo dua lossis ze rau cov roj hmab styrene butadiene, chlorosulfonated polyethylene, polyethylene thiab cross-linked polyethylene.
7. Kev ywj pheej
Vim tias ethylene propylene roj hmab tsis muaj cov khoom hloov pauv polar hauv nws cov qauv molecular thiab lub zog sib xyaw molecular qis, nws cov saw molecular tuaj yeem tswj tau qhov yooj ywm hauv ntau yam, thib ob tsuas yog roj hmab ntuj thiab cis polybutadiene roj hmab, thiab tseem tuaj yeem tswj tau ntawm qhov kub qis.
8. Kev nplaum
Vim tsis muaj cov pab pawg nquag hauv cov qauv molecular ntawm ethylene propylene roj hmab, lub zog cohesion tsawg, thiab cov roj hmab yooj yim rau txau, yog li qhov kev nplaum tus kheej thiab kev sib txuas ua ke tsis zoo heev.
Lub sijhawm tshaj tawm: Lub Kaum Hli-10-2022