HydroxyPropyyl methylcellose (HPMC) yog ib feem siv dej-soluble cellulose cellulose derivative, siv nyob rau hauv cov xim pleev xim thiab pleev xim txhuam. Nws yog ua los ntawm methylcellulose los ntawm hydroxypulose los ntawm hydroxyprropility, thiab nws muaj tshuaj tseem ceeb rau kev tsim kho, tshuaj lom neeg thiab lwm thaj chaw.
1. Kev thov ntawm hydroxypropyyl methylcellose hauv cov xim pleev xim dej
Cov xim xim dej yog xim nrog dej ua cov kuab tshuaj loj. Nws muaj cov yam ntxwv ntawm kev tiv thaiv ib puag ncig, thiab tsis muaj volaticity organic (voc), thiab tau maj mam hloov cov kuab tshuaj yeeb yaj kiab. Raws li cov tuab dua, hpmc plays lub luag haujlwm tseem ceeb hauv cov xim pleev xim.
Thickening nyhuv
Ib qho ntawm cov haujlwm tseem ceeb ntawm HPMC nyob rau hauv cov xim tha xim dej yog muab cov nyhuv tuab. Nws tuaj yeem cuam tshuam nrog cov dej lwg me los ntawm cov pawg mydroxulropyl thiab methyl pawg los tsim cov qauv hydrated, kom cov xim pleev xim muaj cov tshuaj pleev xim zoo. Cov xim tuab tuab muaj zog dua, muaj cov nplaum thiab ua haujlwm zoo dua, thiab tuaj yeem ntseeg lub thickness thiab nto smoothness ntawm txheej.
Txhim kho kev tsim kho ntawm cov txheej txheem
Cov nyhuv tuab ntawm HPMC tsis yog pab txhawm rau txhim kho cov dej ntawm lub tsho, tab sis kuj tseem ua rau cov pigments thiab fillers ntau dua cov hnoos qeev. Qhov no tseem ceeb heev rau kev tsim kho cov xim pleev xim rau cov dej tsis yeem tuaj yeem zam cov teeb meem xws li xim sib txawv, nag lossis daus los yog sagging thaum tsim kho.
Muab cov dej tuav tseg
Txoj kev evaporation ntawm dej thaum lub sij hawm ziab khaub ncaws ntawm cov xim pleev xim rau cov dej xim yog qhov tseem ceeb. Lub sijhawm hauv dej khaws cia ntawm HPMC tuaj yeem hais txog lub sijhawm ntawm cov xim av (qhib lub sijhawm qhib lub sijhawm uas cov xim pleev tom qab tau txais kev txhuam). Qhov yeeb yam no yog qhov tseem ceeb kom ntseeg tau tias cov kev tsim kho zoo, txo cov txhuam txhuam thiab txhim kho theem ntawm cov xim.
Txhim kho lub cev lub cev ntawm txheej ua yeeb yaj kiab
HPMC hauv cov xim tha xim dej tsis tuaj yeem tsuas yog nce cov viscosity ntawm cov khoom siv zog, hloov tsis taus thiab dej tsis kam ntawm cov yeeb yaj kiab txheej. Vim muaj cov pab pawg hydrophilic xws li hydroxyplicyl thiab methyl nyob rau hauv txheej txheej txheem kev ruaj ntseg thiab txhim kho cov huab cua tsis kam thiab kev laus tsis kam ntawm cov txheej.
2. Daim ntawv thov ntawm hydroxypropyl methylcellose hauv cov kab pleev xim
Cov kab hlau xim yog cov tshuaj pleev cov tshuaj siv los tshem cov txheej txheej qub lossis cov yeeb yaj kiab pleev xim, thiab feem ntau siv hauv kev kho xim thiab hloov kho. Cov kab mob xim ib txwm muaj cov kuab tshuaj uas muaj teeb meem, thaum muaj kev nyab xeeb dej ntxiv, ib puag ncig kev nyab xeeb ntawm cov khoom thaum siv nyob rau hauv cov kab pleev xim.
Thickening thiab gelling cuam tshuam
Nyob rau hauv cov kab pleev xim, HPMC ua si lub luag haujlwm hauv thickening thiab gelling, ua cov kab pleev xim tam sim no muaj cov viscosity ntau dua. Qhov kev loj-viscosity stripper tuaj yeem ua raws li cov txheej thiab tsis yooj yim ntws, kom muaj kev sib chwv, kom muaj kev sib chwv nrog cov xim ntev thiab txhim kho nws cov xim stripping cov nyhuv.
Qeeb tso tawm ntawm cov kuab tshuaj
Cov dej-solubility thiab thickening cov khoom ntawm HPMC pab kom cov xim sib tsoo kom maj mam tso nws cov khoom siv kom txaus, yog li txo kev puas tsuaj rau lub substrate. Piv nrog tsoos hlau txaij, cov xim pleev xim rau HPMC tuaj yeem tshem cov txheej me me thiab yog qhov tsim nyog rau ntau qhov kev ua yeeb yaj kiab tshem tawm.
Txhim kho qhov kev ruaj ntseg ntawm cov xim av
Qhov sib ntxiv ntawm HPMC tseem tuaj yeem txhim kho kev ruaj ntseg ntawm cov xim pleev xim thiab txuas ntxiv lawv lub neej cia. HPMC muaj cov dej khov kho kom zoo, uas tiv thaiv stratification lossis nag lossis daus, thiab xyuas kom nws muaj kev sib xws thaum siv.
Txhim kho cov haujlwm ntawm cov xim stripping txheej txheem
Txij li thaum HPMC tuaj yeem txhim kho lub viscosity ntawm cov kab txaij xim, nws tuaj yeem tswj tau zoo dua qhov kev siv tsis yooj yim los ntawm kev nrawm nrawm ntawm cov kuab tshuaj. Nws cov viscosity kuj tseem tuaj yeem txo cov khib nyiab ntawm cov kab pleev xim thiab xyuas kom txhua qhov kev siv tuaj yeem ua rau loj tshaj cov nyhuv.
3. Qhov zoo ntawm HPMC thiab nws cov kev lag luam kev lag luam
Raws li ib puag ncig phooj ywg, cov tshuaj tsis muaj tshuaj lom, tsis muaj kuab tshuaj ntxiv ntxiv, HPMC muaj cov ntawv thov kev lag luam dav heev. Tshwj xeeb tshaj yog nyob rau hauv daim ntawv thov cov xim tsev thiab cov kab pleev xim, lub yam ntxwv ntawm HPMC ua rau nws xaiv qhov zoo tshaj plaws. Nws cov txiaj ntsig hauv thickening, dej khaws cia, rheological cov khoom siv thiab cov nplaum ua kom cov txheej txheem dej ntau ntxiv rau ib puag ncig thiab muaj kev nyab xeeb, thiab cov khoom tsim nyog. Tsis tas li ntawd, cov nyhuv tuab thiab cov kuab tshuaj tso tawm ntawm HPMC hauv cov xim pleev xim los kuj tseem tuaj yeem txhim kho cov kob stripping cov nyhoo thiab tiv thaiv kev puas tsuaj rau substrate.
Raws li kev cai ib puag ncig ua cov hlua khi ua kom nce ntxiv, qhov kev thov rau cov xim pleev xim rau cov dej thiab cov xim ntsuab yuav txuas ntxiv ntxiv. Raws li lub neej zoo ntxiv, HPMC yuav ua lub luag haujlwm tseem ceeb ntxiv hauv cov teb no. Nrog kev txhim kho ntawm tib neeg txoj kev paub txog ib puag ncig thiab kev txhim kho kev xav tau rau cov khoom lag luam pleev xim, cov kev cia siab ntawm HPMC yog qhov dav heev.
HydroxyPropyyl methylulose, raws li kev sib xyaw dej ntau ntau yam dej-soluble polymer, tau siv dav hauv cov xim pleev xim rau hauv cov dej thiab cov xim pleev xim. Nws cov zoo heev thickening, siv dej ua ke, tshem tawm thiab kev ruaj khov txhim kho kev tsim kho thiab ib puag ncig kev phooj ywg ntawm cov khoom no. Yav tom ntej, nrog kev txhim kho ntawm kev tiv thaiv ib puag ncig thiab kev nthuav dav ntawm HPMC yuav txuas ntxiv mus nthuav tawm, nqa ntau dua kev lag luam thiab kev txhim kho ntau dua kev lag luam.
Lub Sijhawm Post: Feb-19-2025