Hauv kev lag luam tshuaj niaj hnub no, peb lub glycols sawv tawm rau lawv cov kev siv ntau yam: Monoethylene Glycol (MEG), Diethylene Glycol (DEG), thiab Triethylene Glycol (TEG). Thaum lawv sib koom cov qauv zoo sib xws, lawv cov ntawv thov thiab cov khoom sib txawv, ua rau nws tseem ceeb heev rau cov neeg yuav khoom kom nkag siab txog qhov txawv ntawm cov khoom siv.
Monoethylene Glycol (MEG):
Monoethylene glycol yog daim ntawv yooj yim tshaj plaws ntawm dihydric cawv, feem ntau hu ua ethylene glycol lossis tsuas yog glycol. Nws tuaj yeem tau txais los ntawm hydrolyzing ethylene chlorohydrin, uas nws tus kheej yog tsim los ntawm ethylene. Hauv kev tsim khoom, MEG feem ntau yog tsim los ntawm ethylene oxide. Qhov no tsis muaj xim, qab zib -tasting, viscous kua yog hygroscopic nyob rau hauv cov xwm. Nws sib tov tau yooj yim nrog dej thiab cawv tab sis tsis tshua muaj soluble hauv ether. MEG ua lub luag haujlwm tseem ceeb hauv kev tsim khoom ntawm polyethylene terephthalate (PET), alkyd resins, thiab hluavtaws fibers.
Diethylene Glycol (DEG):
DEG belongs rau glycol tsev neeg thiab yog tsim los ntawm ob ethylene glycol units nrog poob ntawm ib tug dej molecule. Nws feem ntau tau txais los ntawm - khoom thaum lub sij hawm tsim cov ethylene glycol thiab ua hauj lwm raws li ib tug tseem ceeb raw khoom rau hluavtaws resins. Ntxiv rau,DEGyog dav siv nyob rau hauv cov tshuaj antifreeze, cov dej nres, lubricants, cork plasticizers, coatings, thiab ntim cov ntaub ntawv. Ua tsis yog -flammable, nrog tsawg vapor toxicity thiab tsawg tsawg ntawm daim tawv nqaij nqus, DEG feem ntau xaiv los ua cov kuab tshuaj nyob hauv ntau lub lag luam.
Triethylene Glycol (TEG):
TEGyog lwm tus tswv cuab ntawm pawg glycol, muaj peb ethylene glycol units, thiab tseem siv los ua raw khoom rau hluavtaws resins. Piv nrog MEG, ob qho tib si DEG thiab TEG nthuav tawm ntau dua viscosity thiab cov ntsiab lus kub. TEG, txawm tias flammable, tsis tso cov pa phem los yog ua rau muaj teeb meem ntawm daim tawv nqaij, ua rau nws tsim nyog rau kev siv hnyav. Raws li nws cov tshuaj zoo sib xws rau DEG, nws kuj pom kev siv dav hauv kev tsim khoom thiab cov txheej txheem cuam tshuam.
Dab tsi yog qhov txawv ntawm MEG, DEG, thiab TEG?
Triethylene Glycol (TEG), Diethylene Glycol (DEG) thiab Monoethylene Glycol (MEG) yog siv los ua kua desiccants, tab sis TEG yog qhov feem ntau rau cov roj nkev lub cev qhuav dej vim nws qhov ruaj khov thiab vim tias nws cov kev xaiv txo qis glycol poob.