HPMC (hydroxypropyl methylcellulose) yog ib qho tseem ceeb tshuaj ntxiv uas ua lub luag haujlwm tseem ceeb hauv ntau cov ntaub ntawv hauv tsev, tshwj xeeb tshaj yog cov nplaum nplaum. HPMC muaj ntau yam haujlwm, suav nrog kev ua kom tuab, tuav dej, thiab txhim kho rheology.
Qhib lub sijhawm ntawm cov nplais nplaum
Lub sijhawm qhib yog hais txog lub sijhawm lub qhov rais uas cov nplais nplaum tseem tuaj yeem muab tso rau tom qab nws siv rau hauv substrate. Hauv kev tsim kho tiag tiag, cov nplais nplaum yuav tsum muaj lub sijhawm qhib tsim nyog kom cov neeg ua haujlwm tsim kho muaj sijhawm txaus los ua kom tiav cov vuas. luv luv lub sij hawm qhib yuav ua rau cov nplaum poob nws cov viscosity, yog li cuam tshuam rau kev sib txuas ntawm cov vuas thiab txawm ua rau rov ua haujlwm. Lub sijhawm qhib ntev dhau los yuav cuam tshuam rau kev tsim kho kev ua haujlwm thiab lub zog kawg ntawm kev sib txuas. Yog li, kev tswj kom tsim nyog ntawm lub sijhawm qhib ntawm cov nplais nplaum yog qhov tseem ceeb rau kev txhim kho kev tsim kho kom zoo thiab ua haujlwm zoo.
Cov yam ntxwv tseem ceeb ntawm HPMC
HPMC yog cov dej-soluble polymer muab los ntawm cellulose. Nws muaj cov thickening zoo heev, film-forming thiab dej-retention zog. Hauv cov nplais nplaum, HPMC feem ntau cuam tshuam rau lub sijhawm qhib los ntawm cov txheej txheem hauv qab no:
Kev tuav dej: HPMC tuaj yeem nqus tau thiab khaws dej zoo, yog li tiv thaiv cov dej hauv cov nplaum los ntawm evaporating sai heev. Qhov no yog ib qho tseem ceeb ntawm kev txhim kho lub sijhawm qhib. Thaum lub sij hawm kev tsim kho, cov evaporation ntawm cov dej yuav ua rau cov nplaum nplaum kom qhuav tawm ntxov ntxov, yog li shortening lub sij hawm qhib. HPMC tsim ib qho kev tiv thaiv dej kom ncua kev poob dej thiab xyuas kom meej tias cov nplais nplaum tuav cov av noo tsim nyog rau lub sijhawm ntev.
Cov nyhuv Thickening: Cov tshuaj viscosity siab tsim tom qab HPMC yaj hauv dej tuaj yeem ua kom cov nplaum sib xws thiab tiv thaiv cov nplaum los ntawm ntws sai dhau los yog nkag mus rau hauv lub substrate thaum thov. Los ntawm kev kho tus nqi ntawm HPMC ntxiv, cov khoom rheological ntawm cov nplaum tuaj yeem ua kom zoo, yog li ncua nws lub sijhawm nyob ntawm qhov chaw substrate thiab yog li ua rau lub sijhawm qhib.
Cov cuab yeej ua yeeb yaj kiab: HPMC muaj peev xwm tsim cov yeeb yaj kiab zoo thiab tsim cov yeeb yaj kiab hloov tau yooj yim ntawm cov nplaum nplaum. Cov yeeb yaj kiab no tuaj yeem tsis tsuas yog txo cov dej evaporation, tab sis kuj tiv thaiv qhov tsis zoo ntawm qhov chaw sab nraud xws li cua ceev thiab kub ntawm cov nplaum, yog li txuas ntxiv rau lub sijhawm qhib. Kev ua yeeb yaj kiab ua yeeb yaj kiab ntawm HPMC yog qhov tseem ceeb tshwj xeeb hauv qhov kub thiab txias ib puag ncig, vim tias cov dej evaporates sai dua nyob rau hauv cov xwm txheej ib puag ncig thiab lub sijhawm qhib ntawm cov nplaum yuav luv dua.
Kev cuam tshuam ntawm cov qauv molecular ntawm HPMC ntawm lub sijhawm qhib
Cov qauv molecular thiab qib ntawm kev hloov pauv (piv txwv li, qib ntawm hydroxypropyl thiab methyl hloov pauv) ntawm HPMC yog qhov tseem ceeb cuam tshuam rau nws cov kev ua tau zoo hauv cov nplaum nplaum. Feem ntau, HPMC nrog rau qib siab dua ntawm kev hloov pauv muaj peev xwm khaws cov dej muaj zog dua thiab cov nyhuv thickening zoo dua, uas yuav pab kom ncua sij hawm qhib ntawm cov nplaum. Tsis tas li ntawd, qhov hnyav molecular ntawm HPMC tseem cuam tshuam rau nws cov solubility hauv dej thiab viscosity ntawm cov tshuaj, uas cuam tshuam tsis ncaj rau lub sijhawm qhib.
Hauv kev siv cov tswv yim, cov tuam txhab tsim khoom tuaj yeem xaiv HPMC ntawm cov kev qhia tshwj xeeb raws li kev tsim kho sib txawv kom ua tiav kev tswj xyuas meej ntawm lub sijhawm qhib ntawm cov nplais nplaum. Piv txwv li, nyob rau hauv ib qho chaw kub thiab qhuav, xaiv HPMC nrog kev hloov pauv siab thiab qhov hnyav molecular tuaj yeem tswj tau lub xeev ntub dej ntawm cov nplaum zoo dua, yog li ncua sijhawm qhib; Thaum nyob rau hauv ib qho chaw ntub thiab txias, HPMC nrog rau qib qis ntawm kev hloov pauv tuaj yeem raug xaiv kom tsis txhob qhib lub sijhawm ntev thiab cuam tshuam rau kev tsim kho.
Kev ua tau zoo ntawm HPMC nyob rau hauv ib puag ncig sib txawv
Cov chaw tsim kho sib txawv muaj cov kev ua tau zoo sib txawv rau cov nplais nplaum. Daim ntawv thov ntawm HPMC tuaj yeem pab cov nplais nplaum tuav lub sijhawm qhib ruaj khov nyob rau hauv ntau yam ntawm ib puag ncig. Hauv qhov chaw kub, qhuav thiab cua, dej evaporates sai dua, ua rau cov nplaum nplaum plam viscosity sai. HPMC cov dej tuav tau zoo tuaj yeem ua rau cov txheej txheem no qeeb qeeb, kom ntseeg tau tias cov nplais nplaum tseem nyob hauv lub xeev tsim nyog rau lub sijhawm ntev.
Nyob rau hauv qhov kub thiab txias los yog high humidity tej yam kev mob, txawm hais tias cov dej evaporates maj mam, lub thickening thiab zaj duab xis-tsim los ntawm HPMC tseem tuaj yeem pab tswj cov rheology ntawm cov nplaum thiab tiv thaiv cov nplaum los ntawm kev sib kis sai heev ntawm cov substrate nto, ua rau tsis sib xws. Los ntawm kev kho tus nqi thiab hom HPMC ntxiv, lub sijhawm qhib ntawm cov nplais nplaum tuaj yeem hloov kho tau zoo nyob rau hauv ntau yam ib puag ncig.
Qhov cuam tshuam ntawm HPMC siv rau kev tsim kho
Los ntawm kev ntxiv HPMC, lub sijhawm qhib ntawm cov nplais nplaum tuaj yeem txuas ntxiv, uas ua rau muaj txiaj ntsig ntau rau cov neeg ua haujlwm tsim kho. Ua ntej, cov neeg ua haujlwm tsim kho muaj sijhawm ntau los kho thiab nteg cov vuas, txo kev tsim kho los ntawm lub sijhawm qhib luv luv. Qhov thib ob, cov yeeb yaj kiab-tsim thiab dej-tswj cov teebmeem ntawm HPMC kuj txo cov kev tsim kho uas tshwm sim los ntawm qhov tsis sib xws ntawm qhov ziab, xws li pobzeb warping lossis hollowing. Tsis tas li ntawd, cov nyhuv thickening ntawm HPMC kuj tseem txhim kho txoj kev muaj peev xwm ntawm txoj hlua khi ntawm cov nplaum, kom tsis txhob zawv zawg ntawm cov vuas ntawm cov phab ntsa ntsug.
HPMC zoo txhim kho lub sijhawm qhib ntawm pobzeb nplaum los ntawm nws cov dej tuav zoo, thickening thiab zaj duab xis-tsim cov khoom. Qhov no tsis yog tsuas yog txhim kho qhov yooj yim thiab kev ua haujlwm ntawm kev tsim kho, tab sis kuj ua kom muaj kev sib raug zoo kawg. Nrog rau kev txhim kho txuas ntxiv ntawm kev tsim kho thev naus laus zis, HPMC, raws li cov khoom siv ntau yam ntxiv, yuav muaj qhov kev thov dav dav hauv cov nplais nplaum. Nyob rau hauv lub neej yav tom ntej, los ntawm kev ua kom zoo dua cov qauv molecular thiab daim ntawv thov ntawm HPMC, kev ua haujlwm ntawm cov nplais nplaum yuav tsum tau txhim kho ntxiv.
Post lub sij hawm: Sep-26-2024