Hydroxypropyl Methylcellulose (HPMC) thiabHydroxyethyl Cellulose (HEC) yog ob qho tib si cellulose derivatives, dav siv hauv kev lag luam, tshuaj, tshuaj pleev ib ce thiab lwm yam. Lawv qhov sib txawv tseem ceeb yog xav txog hauv cov qauv molecular, cov yam ntxwv solubility, daim ntawv thov teb thiab lwm yam.
1. Molecular qauv
Hydroxypropyl Methylcellulose (HPMC)
HPMC yog cov dej-soluble derivative qhia los ntawm kev qhia methyl (-CH3) thiab hydroxypropyl (-CH2CHOHCH3) pawg rau hauv cov saw cellulose molecular. Tshwj xeeb, cov qauv molecular ntawm HPMC muaj ob qho kev hloov pauv, methyl (-OCH3) thiab hydroxypropyl (-OCH2CH(OH)CH3). Feem ntau, qhov kev taw qhia piv ntawm methyl yog siab dua, thaum hydroxypropyl tuaj yeem txhim kho cov solubility ntawm cellulose.
Hydroxyethyl Cellulose (HEC)
HEC yog ib qho derivative qhia los ntawm kev qhia ethyl (-CH2CH2OH) pawg rau hauv cov saw cellulose molecular. Hauv cov qauv ntawm hydroxyethyl cellulose, ib lossis ntau pawg hydroxyl (-OH) ntawm cellulose yog hloov los ntawm ethyl hydroxyl pawg (-CH2CH2OH). Tsis zoo li HPMC, cov qauv molecular ntawm HEC tsuas muaj ib qho kev hloov pauv hydroxyethyl thiab tsis muaj methyl pawg.
2. Dej solubility
Vim muaj qhov sib txawv ntawm cov qauv, cov dej solubility ntawm HPMC thiab HEC sib txawv.
HPMC: HPMC muaj dej solubility zoo, tshwj xeeb tshaj yog nyob rau nruab nrab los yog me ntsis alkaline pH qhov tseem ceeb, nws solubility zoo dua HEC. Kev taw qhia ntawm methyl thiab hydroxypropyl pawg txhim kho nws cov solubility thiab tuaj yeem ua kom nws cov viscosity los ntawm kev cuam tshuam nrog dej molecules.
HEC: HEC feem ntau yog soluble hauv dej, tab sis nws cov solubility tsis zoo, tshwj xeeb tshaj yog nyob rau hauv cov dej txias, thiab nws feem ntau yuav tsum tau yaj nyob rau hauv cov cua sov los yog xav tau ntau dua kom ua tau zoo viscosity los. Nws solubility muaj feem xyuam rau cov qauv sib txawv ntawm cellulose thiab hydrophilicity ntawm pawg hydroxyethyl.
3. Viscosity thiab rheological zog
HPMC: Vim muaj ob pawg hydrophilic sib txawv (methyl thiab hydroxypropyl) nyob rau hauv nws cov molecules, HPMC muaj qhov zoo viscosity hloov cov khoom hauv dej thiab yog siv dav hauv cov nplaum, coatings, detergents, tshuaj npaj thiab lwm yam. Ntawm qhov sib txawv ntawm qhov sib txawv, HPMC tuaj yeem muab kev hloov kho los ntawm qhov tsis muaj viscosity mus rau siab viscosity, thiab cov viscosity ntau dua rau pH hloov.
HEC: Lub viscosity ntawm HEC kuj tuaj yeem hloov kho los ntawm kev hloov cov concentration, tab sis nws qhov kev hloov kho viscosity yog nqaim dua li ntawm HPMC. HEC feem ntau yog siv rau hauv cov xwm txheej uas yuav tsum tau muaj viscosity qis mus rau nruab nrab, tshwj xeeb tshaj yog nyob rau hauv kev tsim kho, tshuaj ntxuav tes thiab cov khoom tu tus kheej. Cov khoom rheological ntawm HEC yog qhov ruaj khov, tshwj xeeb tshaj yog nyob rau hauv acidic lossis nruab nrab ib puag ncig, HEC tuaj yeem muab cov viscosity ruaj khov dua.
4. Daim ntawv thov teb
Hydroxypropyl methylcellulose (HPMC)
Kev tsim kho kev lag luam: HPMC feem ntau yog siv rau hauv cov cement mortar thiab coatings nyob rau hauv kev tsim kho kev lag luam los txhim kho fluidity, operability thiab tiv thaiv cov kab nrib pleb.
Kev lag luam kws tshuaj: Raws li tus neeg saib xyuas kev tso tawm tshuaj, HPMC tau siv dav hauv kev lag luam tshuaj. Nws tuaj yeem tsis tsuas yog siv los ua tus neeg sawv cev rau cov ntsiav tshuaj thiab tshuaj ntsiav, tab sis kuj yog ib qho nplaum los pab cov tshuaj tso tawm sib npaug.
Kev lag luam khoom noj khoom haus: HPMC feem ntau yog siv rau hauv kev ua zaub mov ua tus stabilizer, thickener lossis emulsifier los txhim kho qhov kev ntxhib los mos thiab saj ntawm cov zaub mov.
Kev lag luam tshuaj pleev ib ce: Raws li lub thickener, HPMC yog dav siv nyob rau hauv cov khoom xws li cream, tshuaj zawv plaub hau, thiab cov tshuaj ua kom lub viscosity thiab stability ntawm cov khoom.
Hydroxyethyl cellulose (HEC)
Kev tsim kho kev lag luam: HEC feem ntau siv hauv cov cement, gypsum, thiab cov nplais nplaum los txhim kho cov dej ntws thiab khaws lub sijhawm ntawm cov khoom.
Cov tshuab ntxhua khaub ncaws: HEC feem ntau yog siv hauv tsev ntxhua khaub ncaws, ntxhua khaub ncaws ntxhua khaub ncaws thiab lwm yam khoom los ua kom cov viscosity ntawm cov khoom thiab txhim kho cov nyhuv tu.
Kev lag luam tshuaj pleev ib ce: HEC yog dav siv hauv cov khoom siv tu tawv nqaij, cov gels da dej, tshuaj zawv plaub hau, thiab lwm yam ua cov thickener thiab tshem tawm cov neeg sawv cev los txhim kho kev ntxhib los mos thiab ruaj khov ntawm cov khoom.
Roj rho tawm: HEC kuj tseem siv tau rau hauv cov txheej txheem ntawm cov roj extraction ua cov thickener nyob rau hauv cov dej-raws li drilling kua los pab ua kom cov viscosity ntawm cov kua thiab txhim kho cov nyhuv drilling.
5. pH stability
HPMC: HPMC rhiab heev rau pH hloov. Nyob rau hauv acidic tej yam kev mob, lub solubility ntawm HPMC txo, uas tej zaum yuav cuam tshuam nws kev ua tau zoo. Yog li ntawd, nws yog feem ntau siv nyob rau hauv ib tug nruab nrab rau me ntsis alkaline ib puag ncig.
HEC: HEC tseem nyob ruaj khov tshaj pH dav. Nws muaj zog adaptability rau acidic thiab alkaline ib puag ncig, yog li nws yog feem ntau siv nyob rau hauv formulations uas yuav tsum tau muaj zog stability.
HPMCthiabHECSib txawv hauv cov qauv molecular, solubility, viscosity hloov kev ua tau zoo, thiab cov chaw siv. HPMC muaj dej solubility zoo thiab viscosity hloov kev ua tau zoo, thiab yog tsim rau cov ntawv thov uas yuav tsum tau muaj viscosity siab los yog kev tswj kev tso tawm tshwj xeeb; thaum HEC muaj pH zoo stability thiab ntau yam kev siv, thiab yog haum rau lub sij hawm uas yuav tsum tau nruab nrab thiab tsawg viscosity thiab muaj zog ib puag ncig adaptability. Hauv kev siv tiag tiag, kev xaiv ntawm cov khoom siv twg yuav tsum tau ntsuas raws li cov kev xav tau tshwj xeeb.
Post lub sij hawm: Feb-24-2025