Hydroxyethyl cellulose (HEC) yog tsis-ionic, dej-soluble polymer muab tau los ntawm cellulose, ib qho tshwm sim hauv cov phab ntsa ntawm tes. Nws yog dav siv nyob rau hauv ntau yam kev lag luam xws li cov tshuaj duab, tshuaj pleev ib ce, pleev xim, thiab khoom noj khoom haus, ruaj khov, thiab lub zog khaws cia thiab dej sib dhos. Txawm li cas los xij, sib tham txog tus nqi ntawm HEC kom muaj kev nkag siab dav dav ntawm nws cov khoom, qauv, thiab kev siv.
Nkag siab hydroxyethyl cellulose (HEC):
1. Cov qauv tshuaj:
HEC tau synthesized los ntawm cov tshuaj tiv thaiv ntawm ethylene oxide, ua rau kev qhia ntawm hydroxyethyl pab pawg.
Cov degree ntawm kev hloov pauv (DS) yog hais txog qhov nruab nrab tus naj npawb ntawm cov pab pawg hydroxyethyl ib chav dej qab zib nyob rau hauv lub cellulose chav thiab txiav txim siab cov khoom ntawm HEC. Cov nuj nqis DS ntau dua ua rau cov dej solubility nce ntxiv thiab qis viscosity.
2. Cov Khoom:
HEC yog soluble hauv dej thiab cov kev daws teeb meem ntshiab, uas ua rau nws haum rau ntau yam uas xav tau cov khoom xa tuaj.
Nws ua cov yeeb yam pseudopastic cwj pwm, txhais tau tias nws viscosity txo qis nyob rau hauv shear kev nyuaj siab, cia rau kev thov yooj yim thiab tuav.
Lub viscosity ntawm kev daws teeb meem hec yog cuam tshuam los ntawm cov ntsiab lus xws li kev xav tau, kub, pH, thiab muaj cov ntsev lossis lwm yam ntxiv.
3. Daim Ntawv Thov:
Kws Tshuaj: HEC yog siv los ua cov thickener thiab stabilizer hauv cov tshuaj thiab cov tshuaj pleev ib ce xws li tshuaj pleev ib ce, cream, thiab kev ncua.
Cov tshuaj pleev ib ce: Nws yog ib qho khoom siv uas muaj nyob rau hauv cov khoom lag luam saib xyuas ntawm tus kheej nrog cov zawv plaub hau, muaj cov tshuaj pleev xim rau nws cov pa thickening.
Cov xim tsev thiab cov xim pleev xim: HEC tau ntxiv rau cov xim tha xim, txheej txheem, thiab cov nplaum kom tswj viscosity, txhim kho cov khoom txaus ntshai, thiab txhim kho zaj duab xis tsim.
Kev lag luam khoom noj khoom haus: hauv cov khoom noj khoom noj, hec pab ua cov tuab, stabilizer, thiab emulsifier hauv cov khoom zoo li cov kua nplaum, hnav khaub ncaws, thiab khoom noj siv mis.
PH tus nqi ntawm hydroxyethyl cellulose (HEC):
1. Pha kev vam khom:
PHIC cov tshuaj uas muaj hec tuaj yeem cuam tshuam nws tus cwj pwm thiab kev ua tau zoo nyob rau hauv ntau yam kev siv.
Feem ntau, HEC yog ruaj khov tshaj li ntau ntawm PHAB NTAU, feem ntau ntawm Ph 2 thiab Ph 12. Txawm li cas los xij, yuav cuam tshuam rau nws cov khoom thiab kev ruaj khov.
2. PHEEB RAU VISCOST:
Lub viscosity ntawm HEC kev daws teeb meem tuaj yeem yog P-dependent, tshwj xeeb ntawm cov pH siab lossis tsawg.
Nyob ze ntawm nruab nrab ntawm cov tsiaj nruab nrab (PH 5-8), HEC cov kev daws teeb meem feem ntau ua rau lawv cov viscosity ntau tshaj.
Ntawm qhov tsawg heev los yog pH qhov tseem ceeb, tus caj qaum cellulose yuav yauv mus hauv cov pa hydrolysis, ua rau muaj kev txo qis hauv viscosity thiab ruaj khov.
3. PHOOJ YWG:
Nyob rau hauv cov qauv nyob qhov twg yuav hloov kho pH kev hloov kho yog qhov tsim nyog, buffers feem ntau siv los tswj cov pher xav tau.
Cov cuffers sib txuam xws li citrate lossis phosphate buffers yog sib xws nrog HEC thiab pab tswj hwm nws cov khoom hauv cov phot xaim tshwj xeeb.
4. Daim ntawv thov saib xyuas:
Cov kws sau yuav tsum txiav txim siab txog kev sib xyaw ua pec nrog lwm cov khoom xyaw hauv kev tsim qauv.
Muaj qee kis, kev kho kom haum rau Ph ntawm daim qauv yuav tsum tau ua kom ua tau zoo ntawm Hec.
Hydroxyethyl cellulose (HEC) yog ib qho ntau yam polymer nrog cov ntawv thov thoob plaws ntau yam lag luam. Thaum nws lub pH ruaj khov feem ntau muaj zog thoob plaws ntau qhov ntau, phrualles tuaj yeem cuam tshuam nws cov kev ua tau zoo thiab kev ruaj khov. Nkag siab txog HEC yog qhov tseem ceeb rau cov khoom lag luam zoo thiab cov khoom siv nyob hauv cov tshuaj, tshuaj pleev ib ce, pleev xim, thiab khoom noj khoom haus. Los ntawm kev xav txog cov qauv PHEEJ thiab ua haujlwm tsim nyog tsim cov tswv yim tsim nyog, HEC tuaj yeem txuas ntxiv ua cov khoom siv muaj txiaj ntsig.
Lub Sijhawm Post: Apr-15-2024