Hydroxypropylencellulose (HPMC) thiab hydroxyethylcelleculose (HEC) yog ob hom ntawm cellulose derivatives siv nyob rau hauv ntau yam kev lag luam. Txawm hais tias lawv qhia qee yam sib xws, tseem muaj ntau yam sib txawv, suav nrog cov qauv tshuaj, cov khoom siv lub cev, thiab cov ntawv thov.
Cov Qauv Tshuaj
Lub ntsiab sib txawv ntawm HPMC thiab HEC yog lawv cov qauv tshuaj. HPMC yog cov hluavtaws polymer ua los ntawm cov celling cellulose nrog cov tshuaj pleev cov tshuaj pleev thiab methyl chloride. Cov txheej txheem tsim cov polymers uas yog ob qho hydrophilic thiab lipophilic, ua rau lawv cov khoom siv sib txawv hauv ntau cov khoom lag luam, suav nrog saib xyuas tus kheej.
HEC, ntawm qhov tod tes, yog biopolymer muab tau los ntawm cellulose. Nws yog tsim los ntawm cov tshuaj tiv thaiv ntawm cellulose nrog ethylene oxide, uas ua cov pab pawg hydroxyethyl ntawm lub cellulose molecules. Qhov no ua rau cov dej-soluble polymer nrog cov khoom siv zoo heev thiab rheological cov khoom, ua rau nws haum rau ntau cov ntawv thov.
Cov Khoom Siv Lub Cev
HPMC thiab HEC muaj cov zog sib txawv vim yog lawv cov qauv sib txawv. Piv txwv li, HPMC yog ntau Hydrophobic dua HEC, uas txhais tau tias nws yog tsawg soluble hauv dej. Yog li, HPMC feem ntau siv los ua cov stabilizer thiab emulsifier hauv cov khoom siv roj xws li cream thiab muaj cov tshuaj pleev. HEC, ntawm qhov tod tes, yog soluble heev hauv dej thiab feem ntau siv los ua cov tshuaj uas tuab thiab ua kom zoo nkauj hauv cov kua aqueous.
Lwm lub cev cov khoom ntawm HPMC thiab HEC yog lawv viscosity. HEC muaj cov viscosity ntau dua HPMC, uas txhais tau tias nws muaj txiaj ntsig zoo ntawm kev daws teeb meem tuab thiab tsim cov kua pleev. Cov cuab yeej no ua rau HEC zoo tagnrho rau kev siv cov xim thiab pleev xim, cov nplaum, thiab lwm yam khoom uas yuav tsum muaj tuab tuab.
Chaw thov
HPMC thiab HEC tau siv dav hauv ntau yam kev lag luam. HPMC feem ntau yog siv nyob rau hauv kev lag luam kws tshuaj li cov nplaum, cov tshuaj pleev xim, thiab cov tshuaj. Nws tseem raug siv los ua cov tuab thiab emulsifier hauv cov khoom lag luam ntawm tus kheej xws li tshuaj zawv plaub hau, cov ntaub qhwv thiab tshuaj pleev ib ce thiab tshuaj pleev ib ce. HPMC kuj tseem siv los ua khoom noj ntxiv thiab hauv kev tsim cov khoom lag luam.
HEC, ntawm qhov tod tes, feem ntau siv los ua tuab thiab tus neeg sawv cev ntawm caj dab hauv ntau yam kev lag luam. Nyob rau hauv cov xim thiab pleev xim kev lag luam, HEC yog siv los ua cov tuab tuab, rheology hloov kho thiab kev pab. Nws kuj yog siv los ua cov dej-tuav dej hauv kev tsim kho kev tsim kho thiab hauv kev tsim cov nplaum, textiles thiab ceramics.
HPMC thiab HEC yog ob lub cellulose derivatives nrog cov qauv sib txawv, cov khoom siv lub cev thiab cov ntawv thov. HPMC yog ntau Hydrophobic thiab yog siv nyob rau hauv ntau yam kev lag luam, thaum HYEC yog ntau cov dej-soluble thiab zoo tagnrho rau cov kua dej uas ua kom tuab thiab tsim cov kua pleev. Nws yog ib qho tseem ceeb kom nkag siab txog qhov sib txawv ntawm ob lub cellulose derivatives thaum xaiv cov khoom siv zoo rau ib qho kev thov.
Lub Sijhawm Post: Feb-19-2025