Hydroxyethyl Cellulose (HEC) thiab hydroxypropyl cellulose (HPC) yog ob feem ntau siv cellulose derivatives. Lawv muaj qee qhov sib txawv hauv cov qauv, kev ua tau zoo thiab kev siv.
1. Cov qauv tshuaj
Hydroxyethyl cellulose (HEC): Hydroxyethyl cellulose yog tsim los ntawm kev qhia ib pawg hydroxyethyl (-CH₂CH₂OH) mus rau cellulose molecule. Cov pab pawg hydroxyethyl muab HEC zoo solubility thiab stability.
Hydroxypropyl Cellulose (HPC): Hydroxypropyl cellulose yog tsim los ntawm kev qhia ib pawg hydroxypropyl (-CH₂CHOHCH₃) mus rau cellulose molecule. Kev taw qhia ntawm pawg hydroxypropyl muab HPC sib txawv solubility thiab viscosity yam ntxwv.
2. Solubility
HEC: Hydroxyethylcellulose muaj solubility zoo hauv dej thiab tuaj yeem tsim cov pob tshab colloidal tov. Nws solubility nyob ntawm qhov kev hloov pauv ntawm pawg hydroxyethyl (piv txwv li tus naj npawb ntawm hydroxyethyl pawg ib chav tsev piam thaj).
HPC: Hydroxypropyl cellulose muaj qee yam solubility hauv dej thiab cov kuab tshuaj organic, tshwj xeeb tshaj yog nyob rau hauv cov kuab tshuaj organic xws li ethanol. Lub solubility ntawm HPC yog heev cuam tshuam los ntawm kub. Thaum kub nce, nws solubility hauv dej yuav txo.
3. Viscosity thiab rheology
HEC: Hydroxyethyl cellulose muaj viscosity siab hauv dej thiab nthuav tawm cov khoom ntawm cov kua pseudoplastic, piv txwv li shear thinning. Thaum shear yog thov, nws viscosity txo, ua rau nws yooj yim rau thov thiab siv.
HPC: Hydroxypropyl cellulose muaj qhov viscosity tsawg thiab nthuav tawm cov pseudoplasticity zoo sib xws hauv cov tshuaj. HPC cov kev daws teeb meem kuj tuaj yeem tsim cov pob tshab colloids, tab sis lawv cov viscosity feem ntau qis dua HEC.
4. Cov chaw thov
HEC: Hydroxyethyl cellulose yog dav siv nyob rau hauv coatings, tsev cov ntaub ntawv, tshuaj pleev ib ce, detergents thiab lwm yam teb. Raws li ib tug thickener, stabilizer thiab suspending tus neeg sawv cev, nws muaj peev xwm tswj tau zoo viscosity thiab rheology ntawm lub system. Hauv cov xim thiab txheej, HEC tiv thaiv cov xim xim thiab txhim kho txheej txheej.
HPC: Hydroxypropyl cellulose feem ntau yog siv hauv tshuaj, khoom noj, tshuaj pleev ib ce thiab lwm yam. Hauv kev lag luam kws tshuaj, HPC feem ntau yog siv los ua cov ntawv khi thiab tswj kev tso tawm rau cov ntsiav tshuaj. Hauv kev lag luam zaub mov, nws tuaj yeem siv los ua cov thickener thiab emulsifier. Vim nws solubility hauv cov kuab tshuaj organic, HPC kuj tseem siv rau hauv qee yam txheej thiab cov ntaub ntawv membrane.
5. Kev ruaj ntseg thiab kav ntev
HEC: Hydroxyethyl cellulose muaj tshuaj lom neeg ruaj khov thiab ua haujlwm ntev, tsis cuam tshuam rau pH hloov, thiab tseem ruaj khov thaum khaws cia. HEC tseem nyob ruaj khov nyob rau hauv ob qho tib si siab thiab qis pH.
HPC: Hydroxypropyl cellulose yog rhiab heev rau kev hloov pauv hauv qhov kub thiab txias, pH, thiab nws yooj yim rau gelation tshwj xeeb tshaj yog thaum kub. Nws stability yog zoo dua nyob rau hauv acidic tej yam kev mob, tab sis nws stability yuav raug txo nyob rau hauv alkaline tej yam kev mob.
6. Ib puag ncig thiab biodegradability
HEC: Hydroxyethyl cellulose yog derivative ntawm natural cellulose, muaj biodegradability zoo thiab yog ib puag ncig tus phooj ywg.
HPC: Hydroxypropyl cellulose kuj yog cov khoom siv biodegradable, tab sis nws tus cwj pwm degradation yuav txawv vim nws solubility thiab ntau hom kev siv.
Hydroxyethyl cellulose thiab hydroxypropyl cellulose yog ob qho tseem ceeb cellulose derivatives. Txawm hais tias lawv ob leeg muaj peev xwm ua kom tuab, ruaj khov thiab tsim cov colloids, vim muaj qhov sib txawv ntawm cov qauv, lawv muaj qhov sib txawv hauv kev solubility, viscosity, thiab daim ntawv thov teb. Muaj qhov sib txawv tseem ceeb hauv kev ruaj ntseg. Kev xaiv ntawm cov cellulose derivative los siv yog nyob ntawm cov kev xav tau ntawm daim ntawv thov thiab kev ua haujlwm.
Post lub sij hawm: Aug-08-2024