Methylcellulose (MC) thiab hydroxypropylulose (HPMC) yog ob qhov sib txawv cellulose uas muaj qee qhov sib txawv hauv cov qauv tshuaj thiab chaw thov. Ntawm no yog cov ncauj lus piav qhia ntawm lawv:
1. Tshuaj Txhuam Qauv Sib Txawv
Methylcellulose (MC):
Methylcellulose yog lub cellulose derivative ua los ntawm kev qhia methyl (-ch₃) pawg rau hauv lub ntuj cellulose molecules. Qee cov pab pawg hydroxyl (-h) hauv cellulose molecule raug hloov los ntawm methyl pawg (-ochiv) los ua methylculose. Feem ntau cov qib ntawm methylation ntawm methylcellulose yog li 1.5 txog 2.5 methyl pawg.
HydroxyPropyyl methylcellulose (HPMC):
HydroxyPropyyl methylulose yog lub cellulose derivative uas ntxiv qhia txog hydroxypropyl (-c₃hoh) ntawm methylcellose. Kev qhia txog cov pab pawg hydroxyprropyl ua rau HPMC muaj kev ua haujlwm zoo dua thiab dav ua haujlwm. Nws cov qauv tshuaj muaj ob qho chaw sib hloov, methyl thiab hydroxypropyl.
2. Qhov sib txawv ntawm solubility
Methylcellulose (MC) muaj cov dej ua kom muaj zog dej, tshwj xeeb yog cov dej sov, nws tuaj yeem tsim cov tshuaj colloidal. Nws solubility yog nyob ntawm cov qib ntawm methylation. Lub siab dua kawm methylation, qhov zoo dua cov dej solubility.
HydroxyPropyyl methylcellose (HPMC) muaj cov dej solubility zoo dua li methylcellose. Vim tias ntawm kev qhia txog cov pab pawg hydroxypropylropyl, HPMC kuj tseem tuaj yeem ploj hauv dej txias. Piv nrog methylcellulose, HPMC muaj cov dider solubility, tshwj xeeb tshaj yog nws tuaj yeem ploj sai sai ntawm qis kub.
3. Qhov sib txawv ntawm cov khoom siv lub cev
Methylcellulose (MC) feem ntau yog tsis muaj xim rau cov hmoov dawb lossis cov khoom siv yog viscous, nrog zoo emulsification, thickening thiab gelling cov khoom. Hauv qee cov kev daws teeb meem, methylcellulose tuaj yeem tsim ib qho gel yooj yim, tab sis "rupture" tshwm sim thaum rhuab.
HydroxyPropyyl methylcellueculose (HPMC) muaj cov viscosity siab dua thiab zoo dua thermal stability. HPMC cov kev daws teeb meem feem ntau yog ruaj khov tshaj li ib qho kev sib tw dav thiab tsis txhob poob lawv cov khoom loj thaum ua kom dav zoo li MC, yog li nws tau siv dav hauv cov khoom kub-rhiab.
4. Daim ntawv thov teb
Vim tias lawv cov kev pab cuam solubility thiab lub cev, methylcellulose thiab hydroxypropylulose yog dav siv nyob rau hauv cov teb sib txawv:
Methylcellulose (MC):
Raws li cov tuab dua, emulsifier thiab stabilizer, nws yog dav siv nyob rau hauv kev lag luam khoom noj, tshuaj pleev ib ce thiab cov tshuaj pleev ib ce.
Hauv cov ntaub ntawv hauv tsev, MC feem ntau siv hauv cov cement, gypsum, nplais nplaum thiab lwm yam khoom lag luam raws li dej khaws cia tus neeg sawv cev thiab cov tuab tuab.
Nws tseem raug siv los ua kev ntxiv rau cov txheej txheem thiab inks.
HydroxyPropyyl methylcellulose (HPMC):
Raws li cov tuab dua, emulsifier thiab stabilizer, HPMC tau dav siv hauv kev lag luam kws tshuaj, tshwj xeeb tshaj yog cov tshuaj muaj kev tso tshuaj.
Hauv kev tsim kho kev tsim kho, HPMC yog siv rau hauv cov txheej txheem phab ntsa, qhuav culture, cov nplaum qhuav, cov khoom nplaum thiab lwm yam kom muaj adhesion zoo dua thiab dej tsis kam.
Hauv kev lag luam khoom noj khoom haus, HPMC feem ntau siv los ua tuab, stabilizer, emulsifier, thiab lwm yam.
Hauv cov tshuaj pleev ib ce, HPMC tuaj yeem siv ua kev nyiam, gel yav tas los, thiab lwm yam.
5. Kev ruaj khov thiab kub tiv taus
Methylcellulose (MC) yog rhiab rau qhov kub siab. Tshwj xeeb tshaj yog thaum rhuab, MC daws teeb meem yuav gel thiab tawg, ua rau muaj kev daws teeb meem tsis txaus ntseeg. Nws yog ntau soluble hauv dej kub, tab sis tsawg soluble hauv dej txias.
Piv nrog MC, HydroxyPropyY methylcellose (HPMC) tau zoo dua Thermal ruaj khov thiab muaj peev xwm nyob ruaj khov, yog li nws tau siv dav hauv cov khoom lag luam hauv qhov chaw kub.
6. Tus nqi thiab kev ua lag luam
Vim yog cov txheej txheem sib xyaw ua ke thiab tus nqi siab ntawm HPMC, nws feem ntau yog kim dua methylcellose. Hauv qee cov ntawv thov nrog cov nqi qis dua, Methylcellulose tuaj yeem yog qhov kev ua tau zoo dua, xws li cov kws tshuaj thiab cov ntaub ntawv ua haujlwm hauv tsev.
Txawm hais tias ob lub methylcellulose (MC) thiab hydroxypropylulose (HOLMC) yog cov qauv siv tshuaj, solubility thiab cov khoom siv lub cev thiab cov khoom siv lub cev sib txawv. HPMC tau siv dav hauv ntau daim teb (xws li cov chaw ua tshuaj, kev tsim kho thiab kev siv tshuaj pleev ib ce zoo dua qub thiab cov ntawv siv hluav taws xob zoo dua qub
Lub sijhawm Post: Feb-15-2025