HydroxyPropyyl Methylcellulose (HPMC) thiabHydroxyethyl cellulose (HEC) Yog ob lub cellulose derivatives, siv dav hauv kev lag luam, tshuaj, tshuaj pleev ib ce thiab lwm thaj teb. Lawv qhov sib txawv tseem ceeb tau cuam tshuam hauv cov qauv molecular, solubility cov yam ntxwv, thov teb thiab lwm yam.
1. Molecular qauv qauv
HydroxyPropyyl Methylcellulose (HPMC)
HPMC yog dej-soluble derivative qhia los ntawm kev qhia methyl (-ch3) thiab hydroxypropyl (-ch2chohch3) pawg rau hauv cellulose molecular. Tshwj xeeb, cov qauv molecular ntawm HPMC muaj ob qho chaw ua haujlwm, methyl (-och3) thiab hydroxypropyl (-och2ch (Oh) CH3). Feem ntau, cov lus qhia sib piv ntawm methyl ntau dua, thaum hydroxypropyl tuaj yeem txhim kho cov solubility ntawm cellulose.
Hydroxyethyl cellulose (HEC)
HEC yog qhov kev qhia ua derivative los ntawm kev qhia txog ethyl (-ch2ch2oh) pawg rau hauv cellulose molecular molecular. Hauv cov qauv ntawm hydroxyethyl cellulose, ib lossis ntau dua hydroxyl pawg (-oh) ntawm cov pab pawg hydroxyl (-ch2ch2oh). Tsis zoo li HPMC, cov qauv molecc, cov qauv meccular ntawm HEC muaj tsuas yog ib hydroxyethyl hloov chaw thiab tsis muaj methyl pawg.
2. Dej Solubility
Vim tias cov txheej txheem sib txawv, cov dej solubility ntawm HPMC thiab HEC txawv.
HPMC: HPMC muaj cov dej so zoo, tshwj xeeb ntawm nruab nrab lossis me ntsis alkaline p values, nws solubility yog qhov zoo dua li HEC. Cov lus qhia ntawm methyl thiab hydroxypropropyl pab pawg txhim kho nws solubility thiab tseem tuaj yeem nce nws viscosity los ntawm kev sib cuam tshuam nrog dej lwg me me.
HEC: Hec feem ntau soluble hauv dej, tab sis nws solubility kuj tsis zoo, thiab nws feem ntau yuav tsum tau yaj nyob rau hauv cov cua txias lossis yuav tsum tau ua kom tiav kom ua tiav cov viscosity zoo ib yam li. Nws solubility yog cuam tshuam nrog cov txheej txheem sib txawv ntawm cellulose thiab hydrophilicity ntawm hydroxyethyl pab pawg.
3. Viscosity thiab rheological khoom
HPMC: Vim tias muaj ob pab pawg hydrophilic sib txawv (Methyl thiab yog dav siv nyob rau hauv cov nplaum, Hydropospropyl) nyob rau hauv nws cov lwg me me, tshuaj ntxuav tshuaj, chaw tsim khoom thiab lwm thaj chaw. Ntawm ntau qhov ntau, HPMC tuaj yeem hloov kho los ntawm kev hloov kho qis los ntawm cov viscosity siab, thiab cov viscosity yog ntau rhiab rau cov kwv.
HEC: Lub viscosity ntawm HEC kuj tseem tuaj yeem hloov kho los ntawm kev hloov pauv ntawm cov siab, tab sis nws cov viscososity hloov tau ntau tshaj li HPMC. HEC feem ntau yog siv nyob rau hauv cov xwm txheej uas tsawg rau nruab nrab viscosity yog xav tau, tshwj xeeb yog hauv kev tsim kho, xab npum thiab cov khoom lag luam tu. Cov yam ntxwv rheological ntawm HEC yog qhov ruaj khov, tshwj xeeb tshaj yog nyob rau hauv acidic lossis neutral ib puag ncig, HEC tuaj yeem muab cov viscosity ruaj khov.
4. Daim ntawv thov teb
HydroxyPropyyl methylcellulose (HPMC)
Kev lag luam tsim kev tsim kho: HPMC feem ntau yog siv nyob rau xisent cug thiab txheej hauv kev tsim kho kev lag luam los txhim kho kev txhim kho kom zoo dua huab cua, ua haujlwm thiab tiv thaiv cov kab nrib pleb.
Kws Tshuaj Kho Mob: Ua cov tshuaj tso tawm tshuaj tso tawm, HPMC tau dav siv hauv kev lag luam kws tshuaj. Nws tsis tuaj yeem siv los ua tus neeg sawv cev rau cov ntsiav tshuaj thiab cov tsiav tshuaj, tab sis kuj yog cov nplaum kom pab cov tshuaj uas tso tawm ntawm cov tshuaj yaum.
Feem ntau kev lag luam khoom noj: HPMC feem ntau siv hauv kev ua zaub mov noj ua lub stabilizer, thickener lossis emulsifier los txhim kho cov qauv thiab saj cov zaub mov.
Kev lag luam tshuaj pleev ib ce: Raws li cov tuab dua, hpmc tau siv dav hauv cov khoom lag luam xws li cov tshuaj pleev, tshuaj ntxhua, thiab cov tshuaj ntxuav kom nce viscosity thiab ruaj khov ntawm cov khoom.
Hydroxyethyl cellulose (HEC)
Kev lag luam kev tsim kho: Hec feem ntau siv hauv cov cement, gypsum, thiab cov nplaum nplaum los txhim kho lub hauv qab thiab ua kom tiav lub sijhawm ntawm cov khoom.
Cov tshuaj ntxuav hauv tsev neeg siv cov tshuaj ntxuav tsev neeg, cov khaub ncaws ntxhua khaub ncaws thiab lwm yam khoom kom nce viscosity ntawm cov khoom thiab txhim kho cov nyhuv ntxuav.
Kev lag luam tshuaj pleev ib ce: HEC tau dav siv hauv cov khoom tu tawv nqaij, tshuaj lom neeg da dej, thiab lwm yam raws li cov neeg sawv cev thiab muaj kev ruaj khov ntawm cov khoom.
Cov roj tawm: HEC kuj tseem siv tau rau cov txheej txheem kev rho tawm cov roj tawm los pab kom cov kua dej ua kom dej thiab txhim kho cov nyhuv drilling.
5. PHEEJ
HPMC: HPMC yog rhiab heev rau cov ntawv hloov. Nyob rau hauv acidic tej yam kev mob, lub solubility ntawm HPMC txo qis, uas tuaj yeem cuam tshuam nws qhov kev ua tau zoo. Yog li ntawd, nws feem ntau yog siv nyob rau hauv ib qho nruab nrab mus rau ib qho chaw alkaline me ntsis.
HEC: HEC tseem nyob hauv qhov chaw ruaj khov tshaj li. Nws muaj qhov muaj zog yoog rau acidic thiab alkaline ib puag ncig, yog li nws feem ntau siv hauv cov qauv uas xav tau ruaj khov.
HPMCthiabTus paSib txawv hauv cov qauv molecular, solubility, kho kom zoo nkauj, thiab thaj chaw thov. HPMC muaj cov dej ua kom zoo thiab viscosity Haum kev ua haujlwm, thiab yog qhov tsim nyog rau cov ntawv thov uas yuav tsum muaj viscosity lossis kev qhia tshwj xeeb; Thaum HEC muaj cov ntawv thov zoo thiab haum rau qee zaus uas xav tau viscosity thiab tsis muaj viscosity thiab muaj zog ib puag ncig kev yoog. Hauv kev thov tiag tiag, kev xaiv ntawm cov khoom uas yuav tsum tau ntsuas raws li cov kev xav tau.
Lub Sijhawm Post: Feb-24-2025