Solenoid valve sealing cov ntaub ntawv, EPDM roj hmab

EPDM ethylene propylene diene roj hmab
EPDM roj hmab yog terpolymer ntawm ethylene, propylene thiab non-conjugated diene. Kev tsim khoom lag luam pib xyoo 1963. Kev noj txhua xyoo hauv ntiaj teb yog 800, 000 tons. Cov yam ntxwv tseem ceeb tshaj plaws ntawm EPDM yog nws cov kev tiv thaiv zoo tshaj rau oxidation, ozone thiab corrosion. Txij li thaum EPDM roj hmab belongs rau tsev neeg polyolefin, nws muaj vulcanization zoo heev. Ntawm tag nrho cov roj hmab, EPDM muaj qhov qis tshaj qhov tshwj xeeb. Nws tuaj yeem nqus tau ntau ntawm cov fillers thiab cov roj uas muaj cov nyhuv me me ntawm cov khoom. Yog li tus nqi-zoo roj hmab compound tuaj yeem tsim tau.
Molecular qauv thiab cov khoom: EPDM yog terpolymer ntawm ethylene, propylene thiab non-conjugated dienes. Dienes muaj cov qauv tshwj xeeb, thiab tsuas yog ib qho ntawm ob daim ntawv cog lus tuaj yeem ua copolymerized. Lub unsaturated ob daim ntawv cog lus feem ntau yog siv los ua qhov chaw sib txuas. Lwm qhov tsis txaus ntseeg yuav tsis dhau los ua cov saw tseem ceeb ntawm cov polymer, tab sis tsuas yog yuav dhau los ua cov saw hlau sab. Lub ntsiab polymer chains ntawm EPDM yog tag nrho saturated. Cov cuab yeej no ua rau EPDM tiv taus cua sov, lub teeb, oxygen, thiab tshwj xeeb tshaj yog ozone. EPDM yog non-polar nyob rau hauv cov xwm, resistant rau polar daws thiab tshuaj, muaj tsawg dej nqus thiab muaj zoo insulating zog.
Nta
1. Tsawg ceev thiab siab filling peev;
2. Kev laus tsis kam;
3. corrosion kuj;
4. Dej vapor tsis kam;
5. Resistance rau superheated dej;
6. Cov khoom siv hluav taws xob;
7. Yooj yim;
8. Adhesion.