HydroxyPropyyl Metylcellulose (HPMC) yog ib qho tseem ceeb ntxiv cov neeg siv cov khoom lag luam ntxiv hauv kev lag luam, tshwj xeeb tshaj yog nyob rau hauv looj cov xim tsev. Raws li cov dej-soluble polymer compound, HPMC muaj ib qho tseem ceeb ntawm kev ua tau zoo ntawm cov xim yas los ntawm kev kho nws cov rheology, dej khaws cia thiab ruaj khov.
1. Cov qauv tshuaj lom neeg thiab cov khoom tseem ceeb ntawm HPMC
HPMC yog ib nrab hluavtaws polymer tau txais los ntawm Ethegation hloov kho ntawm cellulose. Nws cov txheej txheem theem pib yog cov khoom siv hydroxypropyl thiab methyl chaw nyob rau ntawm lub cellulose molecular. Cov qauv no muab HPMC zoo solubility thiab thickening muaj peev xwm hauv dej. Tsis tas li ntawd, txoj kev sib xyaw ua ke, qib kawm ntawm HPMC tuaj yeem muaj cov kev sib txawv ntawm nws cov kev ua tau zoo. Nyob rau hauv looj xim, hpmc feem ntau yog lub luag haujlwm ntawm cov tuab tuab, stabilizer thiab kev ua yeeb yaj kiab.
2. Cov nyhuv ntawm HPMC ntawm lub rheology ntawm looj xim
Rheology yog hais txog kev ntws thiab deformation tus cwj pwm ntawm cov ntaub ntawv raws li kev txiav txim ntawm sab nraud rog, uas cuam tshuam ncaj qha cuam tshuam thiab kev ua tau zoo ntawm cov txheej txheem. HPMC cuam tshuam rau cov rheology ntawm cov xim yas ntawm cov hau kev hauv qab no:
Thickening cov nyhuv: HPMC tuaj yeem ua kom muaj zog ua kom lub viscosity ntawm cov kab ke hauv looj cov xim. Txij li thaum cov qauv molecular Qhov tsim nyog viscosity pab cov xim kom covyely coated thaum thov thiab txwv tsis pub ua rau sagging thiab splashing.
Thixotropy: HPMC tuaj yeem muab cov xim yas lub siab zoo, uas yog, lub viscosity txo qis nyob rau hauv shear thiab rov qab tom qab shearing yog nres. Cov cuab yeej no ua rau cov xim zoo nkauj yooj yim rau kis thaum txhuam thiab dov thiab tuaj yeem ua kom sai thiab tuaj yeem ua zaj duab xis du thiab txawm tias ua tiav.
Anti-Sag: Thaum thov ntawm qhov chaw ntsug, cov xim pleev xim yog nquag mus rau sagging. Lub thickening nyhuv ntawm HPMC tuaj yeem txhim kho txoj kev dai ntsug ntawm cov txheej txheej, tso cai rau txheej txheej tuab yam tsis tau swb.
3. Tus cawv ntawm HPMC rau ntawm cov dej tuav tseg ntawm cov xim pleev xim
Dej khaws cia yog cov xim muaj peev xwm khaws cov dej noo thaum daim ntawv thov thiab ziab, uas yog qhov tseem ceeb rau kev ua yeeb yam ntawm cov xim huv. Cov cawv ntawm HPMC ntawm cov dej tuav ntawm cov xim looj xwb yog qhov yooj yim tshwm sim hauv cov hauv qab no:
Txhim kho kev siv tsim kho tshiab: HPMC tuaj yeem ua kom muaj peev xwm ua kom muaj peev xwm ua kom muaj peev xwm ua kom muaj peev xwm kav dej hauv txheej thiab txo cov dej evaporation thaum lub sijhawm qhib ntawm txheej. Qhov no tso cai rau kev tsim kho cov neeg siv sijhawm ntau dua los kho thiab hloov cov txheej, txhim kho qhov yooj ntawm cov kev ua haujlwm txheej.
Txhim kho cov dej kom qhuav: Kev tswj cov dej kom qhuav ntawm cov xim qhuav thiab pinholes thaum ntxov ntawm cov xim pleev xim, thiab xyuas kom meej meej thiab ncaj ncees ntawm cov xim pleev xim.
Txhim kho txheej yeeb yaj kiab ua tau zoo: Cov dej kom zoo pab cov txheej txheem ditex cwj pwm, txhim kho cov txheej txheem ua kom zoo nkauj thiab huab cua tiv thaiv ntawm cov yeeb yaj kiab txheej.
4. Cov nyhuv ntawm HPMC ntawm kev ruaj ntseg ntawm cov xim pleev xim
Qhov kev ruaj ntseg ntawm lowx xim tsuas yog hais txog kev tswj hwm cov kev sib xws thiab zam cov teeb meem xws li delamination thiab kev sib hais haum thaum lub sijhawm cia thiab siv. Qhov cuam tshuam ntawm HPMC ntawm kev ruaj ntseg ntawm cov xim looj kua yas yog raws li hauv qab no:
Anti-sedimentation nyhom: HPMC tuaj yeem nce viscosity ntawm cov xim ceev, tiv thaiv kev tawm tsam loj thiab kev tswj hwm ntawm cov xim sib dhos.
Txhim kho depinity stability: los ntawm adsorbing cov xim thiab fillers, txo cov kev sib sau ua ke, thiab kom lub cev ruaj khov ntawm cov xim thaum khaws cia.
Khov-thaw kuj muaj kev ruaj khov: HPMC tuaj yeem tswj lub fluab ntawm cov txheej txheem txheej los ua kom muaj cov txheej txheem kom khov, thiab txhim kho lub khov-thaw kiv cua-thaw tsis zoo ntawm cov txheej.
5. Cov cawv ntawm HPMC nyob rau saum npoo ci thiab cov khoom zoo nkauj ntawm cov xim looj xwb
Cov nyhuv ntawm HPMC nyob rau saum npoo av thiab cov khoom zoo nkauj ntawm cov xim looj kua yas kuj tseem yog qhov tseem ceeb ntawm nws daim ntawv thov hauv cov txheej txheem. Feem ntau yog manifested hauv:
Cuam Tshuam: Tus nqi thiab cov qauv molecular ntawm HPMC yuav cuam tshuam rau saum npoo ci ntawm txheej zaj duab xis. HPMC nrog lub siab molecular hnyav lossis cov viscosity siab ntau yam los txo cov thooj ntawm txheej ua yeeb yaj kiab, muab cov teeb meem matte. Los ntawm kho tus nqi HPMC, cov nyhuv xav tau tuaj yeem ua tiav hauv cov qauv sib txawv nrog cov kab sib txawv.
Daj smanness: lub thickening thiab dej khaws cia ntawm HPMC pab txhawb rau qhov sib dhos ntawm cov yeeb yaj kiab thiab qhov tsis xws luag, ua cov txheej txheem txheej xim ntxiv thiab du.
Fouling tsis kam thiab huv si: Txij li HPMC txhim kho lub ntom ntom thiab hnav tsis kam ntawm txheej xim zaj duab xis tseem zoo dua rau qee yam.
HydroxyPropyyl methylulose (HPMC) muaj qhov cuam tshuam tseem ceeb ntawm kev ntseeg, kev ruaj khov ntawm nws cov qauv tshuaj thiab cov khoom siv lub cev. Kev siv HPMC ua rau cov xim zoo nkauj tau yooj yim rau kev ua haujlwm, cov zaj duab xis txheej yog tsim kom muaj kev sib luag, thiab nws qhia tau zoo thaum lub sijhawm khaws cia thiab siv. Yog li ntawd, HPMC yog qhov tseem ceeb thiab tseem ceeb thiab tseem ceeb tivthaiv nyob rau hauv looj cov xim xim. Los ntawm cov kev ua tau zoo sib xws thiab cov ntawv thov, tag nrho cov kev ua tau zoo ntawm cov xim looj cov xim yas tuaj yeem ua kom tau raws li qhov kev xav tau ntawm cov xwm txheej sib txawv.
Lub Sijhawm Post: Feb-17-2025