HPMC (HydroxyPropy cellulose cellulose) yog cov feem ntau siv cov cellulose siv nyob rau hauv ntau cov teb, tshwj xeeb hauv viscosity tswj thiab thickening cov yam ntxwv. Vim nws cov qauv tshuaj tshwj xeeb, HPMC tuaj yeem txhim kho lub viscosity, ruaj khov thiab rheological cov khoom lag luam. Yog li ntawd, nws tau siv dav hauv cov txheej txheem, cov ntaub ntawv tsim tsev, tshuaj, tshuaj pleev ib ce, khoom noj thiab lwm daim teb.
Cov yam ntxwv yooj yim ntawm HPMC
HPMC yog cov khoom siv polymer ua los ntawm kev hloov kho lub cev hloov kho ntuj. Nws cov roj molecular muaj cov pab pawg hydrophilic, yog li nws muaj dej solubility thiab organic zoo li cas. Nws yaj nyob rau hauv dej txias los tsim lub pob tshab lossis translucous tov. Cov yam ntxwv tseem ceeb ntawm HPMC suav nrog:
Zoo heev thickening cov khoom: HPMC tuaj yeem ua kom muaj viscority ntawm cov kev daws teeb meem ntawm cov kev ua kom zoo dua, muab cov teebmeem tuab zoo dua. Qhov no ua rau nws muaj cov khoom siv tsis tseem ceeb hauv kev lag luam xws li cov ntaub ntawv tsim tsev thiab cov khoom siv ua kom tau zoo dua cov khoom siv thov.
Zoo viscosity tswj: HPMC tuaj yeem ua tiav qhov tseeb viscosity tswj kev los ntawm kev kho nws cov roj ntsha hloov (xws li kev siv methoxy thiab hydroxy hloov cov nqi) kom tau raws li cov kev xav tau ntawm kev thov sib txawv. Piv txwv li, hauv kev lag luam txheej, HPMC nrog cov viscosities sib txawv tuaj yeem muab qib theem sib txawv thiab kev ua haujlwm rau cov txheej txheem txheej txheem.
Kev hloov kho rheological hloov kho: lub zog rheological ntawm HPMC tuaj yeem hloov pauv nrog kev hloov pauv ntawm cov kab mob shear. Qhov no txhais tau tias thaum zoo li qub, nws tsim cov qauv vancous heev, thiab viscosity txo thaum cov rog ua haujlwm (xws li txau lossis txau cov khoom yooj yim thov. Ntawm qee cov ntaub ntawv hauv tsev hauv pem teb, cov xeeb ceem no ntawm HPMC tshwj xeeb yog ib qho tseem ceeb.
Zoo biocompatibility thiab tsis muaj txiaj ntsig: HPMC yog muab tau los ntawm cov ntaub ntawv ntawm ntuj ntuj, muaj cov tshuaj lom neeg zoo, tsis muaj kev txhawj xeeb, thiab ua tau raws li kev tiv thaiv kev tiv thaiv. Yog li ntawd, nws tau ua kom muaj kev nyab xeeb dua hauv cov tshuaj pleev ib ce, tshuaj, khoom noj, thiab lwm yam tseem muaj siv nyob rau hauv high-end teb.
Thickening meticism ntawm HPMC hauv cov khoom lag luam
Cov khoom thickening ntawm HPMC feem ntau yog vim nws cov qauv molecular thiab kev sib cuam tshuam ntawm cov lwg me me hauv kev daws. Thaum HPMC yog yaj nyob rau hauv dej los yog lwm yam kuab tshuaj, nws cov macromolecular khi thiab tsim cov tshuaj pleev ib ce muaj zog, yog li nce lub viscosity ntawm lub system. Tsis tas li ntawd, peb-seem Network cov qauv tsim los ntawm HPMC hauv kev daws teeb meem tseem yog tus yuam sij rau nws cov tuab tuab. Cov molecular chains hauv HPMC kev daws teeb meem tau cuam tshuam los ua tus qauv network, uas txo cov kev daws teeb meem ntawm kev daws teeb meem.
Rau cov ntawv thov sib txawv, lub viscosity ntawm HPMC tuaj yeem hloov kho raws li cov hauv qab no:
Kev kho ntawm cov molecular hnyav: lub viscosity ntawm HPMC feem ntau yog sib piv rau nws txoj kev hnyav molecular. Qhov loj dua cov molecular hnyav, ntau dua viscosity ntawm kev daws. Yog li ntawd, los ntawm xaiv HPMC cov khoom lag luam nrog cov hnyav molecular, cov kev daws teeb meem nrog cov viscosities txawv tuaj yeem ua tau kom tau raws li cov khoom lag luam ntau yam.
Kev tswj hwm ntawm cov degree ntawm kev hloov chaw: Cov nyhuv thickening ntawm HPMC kuj muaj feem cuam tshuam nrog nws cov qib ntawm kev hloov pauv. Qhov siab dua qib ntawm kev hloov pauv, lub zog hydrophilicity thiab zoo dua cov nyhuv thickening. Los ntawm kev tswj hwm cov qib ntawm kev hloov pauv ntawm HPMC tus metoxy thiab hydroxypropy thiab hom viscosity tuaj yeem tswj tau precisely.
Cov nyhuv ntawm kev daws teeb meem: cov concentration ntawm HPMC hauv kev daws teeb meem kuj cuam tshuam nrog nws viscosity. Feem ntau hais lus, qhov siab dua ntawm kev daws teeb meem, ntau hom viscosity. Yog li ntawd, los ntawm kev kho cov concentration ntawm HPMC, kho kev tswj ntawm kev daws viscosity tuaj yeem ua tiav.
Daim ntawv thov cov chaw thov thiab ua kom tuab ntawm HPMC
Cov ntaub ntawv hauv tsev: HPMC feem ntau siv los ua cov kev tswj cov tuab thiab viscosity mortarars, cov khoom nplaum hauv av hauv cov ntaub ntawv hauv tsev. Nws cov nyhuv tuab yuav nce cov dej khaws cia ntawm cov ntaub ntawv no, txhim kho lawv cov haujlwm, thiab tiv thaiv kev tawg lossis tawg. Tshwj xeeb tshaj yog nyob rau hauv cov tsheb kub ib puag ncig, HPMC tuaj yeem txuas lub sijhawm qhib ntawm cov khoom siv thiab nce nws txoj haujlwm.
Cov xim pleev xim rau cov xim tha xim: hauv cov txheej txheem kev lag luam, HPMC yog siv los ua cov neeg sawv cev ua kom tiav thiab txhim kho lawv txoj kev ua kom zoo thiab sag tiv taus thaum sib dhos. Nyob rau tib lub sijhawm, HPMC tuaj yeem pab cov xim kom muaj kev faib tawm cov khoom xa tawm, tiv thaiv kev sib hais haum xim, thiab ua kom cov duab zaj duab xis smoother thiab ntau yam kev hnav khaub ncaws.
Tshuaj thiab cov tshuaj pleev ib ce: hauv kev npaj tshuaj, HPMC feem ntau siv los tswj cov tshuaj tso tawm, raws li cov tshuaj txheej kho cov tshuaj thiab cov tshuaj ntsiav. Nws cov khoom siv thickening zoo tau pab txhim kho kev ruaj ntseg ntawm cov tshuaj thiab txuas lub sijhawm ntawm cov tshuaj cuam tshuam. Hauv cov tshuaj pleev ib ce, HPMC yog dav siv nyob rau hauv cov tshuaj pleev, cream, cream, cov khoom siv kom nce viscosity thiab ruaj khov ntawm cov khoom thaum txhim kho kom zoo nkauj thiab noo noo thaum ua ntawv thov.
Kev lag luam khoom noj khoom haus: HPMC feem ntau siv nyob rau hauv kev lag luam khoom noj ua cov ntaub tuab thiab cov khoom noj kom zoo, jellies thiab dej haus. Nws cov khoom tsis muaj tshuaj lom thiab tsw ntxhiab thiab tsis muaj ntxhiab ua rau nws muaj kev nyab xeeb thiab txhim khu kev qha tuab cov khoom noj thiab cov khoom noj.
HPMC tau dhau los ua cov khoom lag luam tsis tseem ceeb hauv cov khoom lag luam niaj hnub vim nws qhov kev ua tau zoo heev thiab viscosity tswj lub peev xwm. Los ntawm kho nws cov roj ntsha hnyav, qib ntawm cov hloov chaw thiab kev daws teeb meem, HPMC tuaj yeem ntsib cov khoom siv viscosity. Nyob rau tib lub sijhawm, nws cov tshuaj uas tsis muaj tshuaj lom, muaj kev nyab xeeb thiab cov kev nyiam ib puag ncig tseem tau siv nyob rau hauv cov zaub mov, tshuaj thiab cov tshuaj pleev ib ce thiab lwm thaj chaw. Nyob rau yav tom ntej, nrog kev nce qib nro ntawm science thiab thev naus laus zis, daim ntawv thov kev coj ua thiab nws yuav tau tshawb fawb ntxiv thiab siv tau.
Sijhawm Sijhawm: Sep-25-2024