Cellulose ether (cellulose ether (cellulose ether) yog cov kab ke polymer rho tawm los ntawm cov nroj tsuag cellulose thiab tau los ntawm kev hloov kho tshuaj lom neeg. Muaj ntau hom cellulose ether, ntawm hydroxypropyl methylcelulose (HPMC) yog qhov muaj ntau. HPMC muaj cov dej ua dej zoo heev, thickening, kev sib sau ua ke, thiab yog siv dav hauv tsev, tshuaj, khoom noj thiab khoom noj txhua hnub.
1. Lub cev thiab tshuaj lom neeg ntawm HPMC
HPMC yog ib qho kev ua yeeb yam tau txais los ntawm hloov lub hydroxyl tshooj nyob rau hauv lub cellulose qauv nrog methoxy thiab hydroxyprropoxy. Nws muaj cov dej ua kom zoo thiab yuav yaj nyob rau hauv dej txias los tsim lub pob tshab thiab cov kev daws teeb meem qhia tau hais tias muaj qee qhov kub ntawm qhov kub. Ntawm cov qis dua, kev daws ntawm HPMC coj tus cwj pwm zoo li cov khoom siv pseudoplastic kua, thiab thov kom muaj kev ntxhov siab, tab sis lub zog viscosity, tab sis rov ua kom sai sai tom qab lub zog nres.
Lub visccity ntawm HPMC tuaj yeem tswj tau los ntawm kev kho nws txoj kev ua haujlwm hnyav thiab qib degree, uas ua rau nws hloov tau yooj yim hauv cov ntawv sib txawv. Hais txog cov khoom lag luam kev ruaj khov, HPMC tuaj yeem ua lub luag haujlwm los ntawm cov txheej txheem hauv qab no.
2. Mechanism ntawm HPMC los txhim kho cov khoom lag luam ruaj khov
Thickening thiab rheological cov kev cai
Raws li cov tuab dua, HPMC tuaj yeem nce cov viscosity ntawm cov kev daws teeb meem lossis slurries, vam meej nce qhov viscosity kev ruaj ntseg ntawm lub system. Rau qee cov khoom lag luam uas yuav tsum tau tswj kom muaj fluidity, xws li txheej ci, thiab chaw kho tshuaj noj kom tsis txhob muaj kev tawm tsam thiab txuas lub txee lub neej ntawm cov khoom. Ib qho ntxiv, cov pseudoploastic ntawm HPMC tso cai rau cov khoom kom nyob ruaj khov thaum lub sijhawm cia khoom thiab kev thauj mus los, thiab ua raws li kev thov nyiaj thaum siv.
Ncua thiab tshem tawm ruaj khov
Hauv qee cov tshuab tsis txaus ntseeg, kev ncua kev ruaj khov ntawm cov khoom siv lossis cov roj ntws hauv cov xov xwm ua kua yog tus yuam sij cuam tshuam rau cov khoom zoo. HPMC tuaj yeem tsim cov qauv sib xyaw ua ke hauv cov kua los ntawm nws cov qauv ua kom tsis txhob ua kom tiv thaiv kom tsis txhob muaj cov qauv siv roj av lossis stratification, yog li kev txhim kho qhov ruaj khov ntawm cov dispersed system. Qhov no yog qhov tshwj xeeb tshaj yog rau cov khoom lag luam xws li emulsions, raug tshem tawm, thiab txheej.
Zaj duab xis-ua cov khoom siv thiab kev tiv thaiv kev tiv thaiv
Cov yeeb yaj kiab ua yeeb yam ntawm HPMC pab kom nws los ua ib zaj yeeb yaj kiab tsis zoo nyob rau ntawm cov khoom tom qab ziab. Cov yeeb yaj kiab no tsis tuaj yeem tiv thaiv cov khoom xyaw nquag hauv cov khoom lag luam los ntawm cov qauv ntawm kev tso yeeb tshuaj sab nraud lossis txuas lub txee hauv lub neej. Tsis tas li ntawd, txheej txheej tiv thaiv tsim los ntawm HPMC kuj tseem tuaj yeem tiv thaiv kom tsis txhob muaj dej thiab txhim kho cov ntaub ntawv hauv tsev xws li cug cug thiab xis.
Thermal ruaj khov thiab ntsuas kub
HPMC qhia qhov ruaj khov nyob ruaj khov ntawm ntau qhov kub. Nws viscosity nyob rau hauv aqueous daws tau ntau dua rhiab rau qhov kub hloov, tab sis kev daws viscosity tseem pheej nyob ntawm chav tsev kub. Tsis tas li ntawd, HPMC undergoes reversible gelation ntawm ib qho kub thiab txias, uas ua rau nws muaj cov khoom ruaj khov rau cov tshuab uas yuav tsum tau nkag siab kub (xws li khoom noj thiab tshuaj).
3. Daim ntawv thov ntawm HPMC txhawm rau txhim kho kev ruaj khov hauv ntau thaj teb
Daim ntawv thov hauv cov ntaub ntawv tsim
Hauv cov ntaub ntawv hauv tsev xws li cakes cultion thiab pobzeb nplaum, HPMC feem ntau siv los kho qhov sib xws ntawm slurry thiab nce cov nqaij ntuag thiab ua haujlwm thaum tsim khoom. Tsis tas li ntawd, HPMC zoo nyob qeeb qeeb ntawm kev sib sau ua ib lub yeeb yaj kiab tom qab kev tsim kho, yog tsis txhob txhim kho lub sijhawm ua haujlwm, yog tsis txhob txhim kho qhov ruaj khov ntawm cov khoom siv thiab cov khoom siv tau zoo.
Daim ntawv thov nyob rau hauv kev npaj khoom lag luam
Hauv kev npaj tshuaj, HPMC tau siv dav siv raws li tuab, zaj duab xis yav tas los thiab tswj tso tawm cov neeg sawv cev. Nws cov nyhuv tuab tuaj yeem txhim kho cov khoom xyaw ruaj khov ntawm cov khoom xyaw nquag los yog emulsions thiab tiv thaiv nag lossis daus. Tsis tas li ntawd, cov yeeb yaj kiab tiv thaiv tsim los ntawm HPMC tuaj yeem tswj tau cov tshuaj tso tawm thiab ntev ntev ntawm kev ua tshuaj ua tau tshuaj. Tshwj xeeb tshaj yog nyob rau hauv kev tsim tawm-tso tawm, HPMC yog ib qho ntawm cov exciPients.
Daim ntawv thov hauv zaub mov
Hauv kev lag luam khoom noj khoom haus, HPMC yog siv los ua cov tuab thiab emulsifier los txhim kho cov qauv thiab saj ntawm cov zaub mov. Nws cov hydration zoo heev tuaj yeem khaws cov dej noo thiab ua kom lub txee txee ntawm cov khoom lag luam. Piv txwv li, hauv cov khoom ci, HPMC tuaj yeem tiv thaiv dej los ntawm kev nqus dej dhau sai thiab txhim kho cov mov ci thiab cov khoom qab zib. Ib qho ntxiv, cov duab ua yeeb yaj kiab ntawm HPMC kuj tseem siv tau rau cov khoom noj txheej kom tiv thaiv oxidation thiab detheration.
Daim ntawv thov hauv cov khoom lag luam txhua hnub
Hauv cov khoom lag luam txhua hnub xws li tshuaj ntxuav tshuaj, zawv plaub hau, thiab cov khoom tu tawv nqaij, HPMC feem ntau siv los ua cov thickener thiab stabilizer. Nws tuaj yeem nce cov khoom lag luam, txhim kho kev hnav khaub ncaws hnav, ua emulsions lossis cov khoom siv gel yooj yim dua thiab siv zog. Nyob rau tib lub sijhawm, cov moisturizing nyhuv ntawm HPMC kuj tseem pab txhim kho cov nyhuv yaa moisturizing ntawm cov khoom siv saib xyuas tawv nqaij.
Raws li ib qho tseem ceeb ntawm tes ether derivative, HPMC tau siv dav hauv ntau yam kev lag luam vim nws qhov kev ua yeeb yam zoo, tshwj xeeb yog kev txhim kho cov khoom ruaj ntseg. Txawm hais tias nyob rau hauv cov ntaub ntawv tsim tsev, tshuaj, khoom noj txhua hnub, kho kom haum rau kev ua haujlwm ntawm kev ua haujlwm, txhim kho kev hloov pauv ntawm lub viscancosity thiab tshem tawm kev kawm tsis meej thiab tshem tawm stability, thiab sib sau cov yeeb yaj kiab tiv thaiv. Nyob rau hauv lub neej yav tom ntej, nrog kev nce qib ntawm kev siv thev naus laus zis thiab kev nthuav dav txuas ntxiv, cov ntaub ntawv thov hauv HPMC hauv ntau daim teb yuav tau qhia ntxiv.
Lub Sijhawm Post: Sep-21-2024