Qhov sib txawv tseem ceeb ntawm DEHT thiab DEHP yog tias DEHT yog cov yas tsis yog phthalate, qhov DEHP yog phthalate plasticizer.
Cov ntsiab lus DEHT thiab DEHP sawv cev rau ob hom khoom siv polymer uas tuaj yeem faib ua cov yas yas. Plasticizer yog ib qho khoom siv uas peb tuaj yeem ntxiv rau qee yam khoom kom nce cov yas los ntawm softening thiab ua kom yooj yim ntawm cov khoom ntawd.
DEHT yog dab tsi
Lub sij hawm DEHT sawv rau dioctyl terephthalate. Qee lub sij hawm nws kuj tseem hu ua DOTP. Peb tuaj yeem categorize nws ua ib qho tsis-phthalate plasticizer. Nws yog cov organic compound uas muaj cov tshuaj formula C6H4(CO2C 8H17)2Cov tshuaj no muaj ob pawg carboxylate ntawm qhov chaw ntawm lub nplhaib benzyl. Nws yog, yog li ntawd, ib tug diester ntawm terephthalic acid thiab nws muaj ob 2-ethylhexanol branched chains txuas mus rau pawg carboxylate.
Daim duab 01: Cov Qauv Tshuaj ntawm DEHT
DEHT tshwm sim raws li cov kua tsis muaj xim, kua nplaum. Txij li nws yog ib hom yas yas, peb tuaj yeem siv cov kua no rau cov khoom muag ntawm cov polymers xws li PVC yas. Yog li ntawd, nyob rau hauv lub hom phiaj dav dav, DEHT zoo ib yam li DEHP thiab lwm yam phthalates, tab sis qhov kev ua ntawm softening siv DEHT tuaj yeem ua tiav nrog kev tswj tsis zoo, uas yog qhov zoo dua. DEHT muaj cov khoom muaj txiaj ntsig zoo, yog li peb tuaj yeem siv nws rau kev hloov pauv ntawm DEHP hauv ntau daim ntawv thov.
Muaj ob txoj hauv kev los tsim DEHT: transesterification ntawm dimethyl terephthalate nrog 2-ethylhexanol thiab ncaj qha esterification ntawm terephthalic acid nrog 2-ethylhexanol. Cov txheej txheem transesterification ua rau cov khoom lag luam: methanol, uas tuaj yeem ua kom huv si kom tau txais cov tshuaj methanol ntshiab los siv rau hauv lwm yam kev siv. Txawm li cas los xij, hauv txoj kev ncaj qha esterification, cov khoom lag luam yog dej. Yog li ntawd, txoj kev thib ob yog ib puag ncig zoo dua.
DEHP yog dab tsi?
Lub sij hawm DEHP sawv rau dioctyl phthalate. Nws yog cov organic compound uas muaj cov tshuaj formula C6H4(CO2C 8H17)2 Nws yog ib hom phthalate plasticizer. Thaum xav txog cov qauv tshuaj ntawm DEHP, nws muaj ob pawg carboxylate nyob rau hauv ortho txoj hauj lwm ntawm lub nplhaib benzyl. Yog li ntawd, peb tuaj yeem lees paub tias nws yog tus neeg tuag ntawm phthalic acid. Nws muaj ob ceg saw ntawm 2-ethylhexanol. DEHP tshwm sim raws li cov xim tsis muaj xim thiab cov kua nplaum ntawm chav tsev kub. Nws tuaj yeem yaj hauv roj tab sis tsis tuaj yeem yaj hauv dej.
Daim duab 02: Cov Qauv Tshuaj ntawm DEHP
DEHP muaj cov khoom zoo thiab tus nqi qis los siv ua cov yas yas. Nws yog ib hom phthalic plasticizer. Feem ntau, cov yas xws li PVC muaj 1-40% DEHP sib xyaw nrog lwm cov khoom. Cov khoom siv polymer no kuj yog siv los ua cov kua dej hydraulic, thiab nws yog ib qho tseem ceeb dielectric kua hauv capacitors. Txoj kev uas feem ntau tsim DEHP yog cov tshuaj tiv thaiv ntawm phthalic anhydride nrog 2-ethylhexanol.
Qhov txawv ntawm DEHT thiab DEHP yog dab tsi?
Lub sij hawm DEHT sawv cev rau dioctyl terephthalate, thaum lub sij hawm DEHP sawv cev rau dioctyl phthalate. Qhov sib txawv tseem ceeb ntawm DEHT thiab DEHP yog tias DEHT yog cov yas uas tsis yog phthalate, qhov DEHP yog phthalate plasticizer. Dhau li ntawd, qhov sib txawv ntawm DEHT thiab DEHP yog tias DEHT muaj nws cov carboxylate pawg ntawm para txoj hauj lwm ntawm lub nplhaib benzyl thaum DEHP muaj nws ob pawg carboxylate ntawm ortho txoj hauj lwm ntawm lub nplhaib benzyl.
Ntxiv mus, DEHT muaj tshuaj lom tsawg dua DEHP, yog li DEHT yog siv los hloov DEHP.
Hauv qab infographic qhia qhov txawv ntawm DEHT thiab DEHP.
Summary – DEHT vs DEHP
DEHT thiab DEHP yog cov khoom siv yas tseem ceeb. DEHT sawv cev rau dioctyl terephthalate thaum DEHP sawv cev rau dioctyl phthalate. Qhov sib txawv tseem ceeb ntawm DEHT thiab DEHP yog tias DEHT yog cov yas tsis yog phthalate thaum DEHP yog phthalate plasticizer.
