Cov xim tsev thiab pleev xim yog cov khoom tseem ceeb hauv kev lag luam niaj hnub thiab kev tsim kho, thiab lawv tau siv dav los tiv thaiv thiab ua kom zoo nkauj. Txawm li cas los xij, txhawm rau kom ntseeg tau tias cov ntaub ntawv no muaj kev pabcuam tsim kho zoo, cov kev pab cuam uas ruaj khov thiab ruaj khov ntawm cov chaw tsim khoom sib txawv yog qhov tshwj xeeb. HydroxyPropy cellulose (HPMC), raws li ib txwm siv dej-soluble polymer compound, ua lub zog tseem ceeb hauv kev txhim kho cov khoom siv rheological ntawm cov xim tsev thiab txheej.
Cov Khoom Yooj Yim ntawm HPMC
HPMC yog lub ntuj cellulose derivative, uas tau npaj los ntawm hloov qee pawg hydroxyl hauv cellulose molecules nrog methoxy thiab hydroxypropoxy pawg. Cov yam ntxwv ntawm HPMC ua nws muaj solubility zoo hauv dej thiab ua pob tshab lossis transcu colloidal daws teeb meem. Tsis tas li ntawd, nws muaj cov kev cai viscosity kev cai, cov dej zoo khaws cia thiab ua rau cov yeeb yaj kiab zoo nkauj, uas ua rau nws yog ib qho kev sib ntxiv zoo tshaj plaws hauv cov xim thiab kev lag luam txheej.
Mechanism ntawm kev ua ntawm HPMC hauv cov xim tha xim thiab txheej
Cov kev cai ntawm rheological cov khoom hluav taws xob rheological cov khoom xa mus rau deformation thiab ntws tus cwj pwm ntawm cov ntaub ntawv ntawm cov rog sab nraud. Rau cov xim tsev thiab cov txheej txheem, cov khoom tsim kom zoo pab txhim kho lawv txoj kev tsim kho thiab zam cov teeb meem xws li sagging thiab txaws. HPMC muaj cov nyhuv tuab rau hauv cov tshuab dej. Nws nce viscosity ntawm txheej los ntawm kev tsim lub network qauv, yog li nws tuaj yeem muaj tusyees them rau ntawm qhov chaw ntsug tsis muaj dej ntws ntau dhau.
Tshwj xeeb, macromolecular chains ntawm HPMC ua tus qauv network ntawm cov kev daws teeb meem ntawm cov lus daws teeb meem, uas tuaj yeem ua rau cov kab mob viscosity thiab qhia shear uas cov yam ntxwv siab. Qhov no txhais tau tias thaum txhuam hniav lossis txau, lub viscosing nres, thiab tom qab lub zog viscosting nres, thiab tom qab lub zog viscos Cov cuab yeej thinning cov cuab yeej zoo heev txhim kho cov xim ua kom zoo thiab pleev xim.
Dej khaws cia thiab ruaj khov HPMC kuj muaj cov khoom siv kom qhuav, uas tau txuas ntxiv rau cov dej kom qhuav vim qhov txheej txheem ziab. Cov cuab yeej no yog qhov tshwj xeeb tshaj yog nyob rau hauv cov chaw tsim khoom kub thiab qhuav, kom ua kom muaj cov nplaum kom loj hlob ua ntej, thiab yog li txhim kho cov nplaum thiab nto smoothness thiab nto smoothness ntawm cov xim.
HPMC tuaj yeem txhim kho kev ruaj ntseg ntawm cov xim. Vim nws cov nyhuv tuab, nws tuaj yeem tiv thaiv cov xim los ntawm kev sib tsoo, tswj kom muaj kev sib txawv ntawm lub cev, thiab txuas lub txee lub neej ntawm cov xim.
Txhim kho cov xim xim hauv cov xim tsim qauv, cov xim yog cov khoom tseem ceeb uas txiav txim xim thiab kev pab them nqi. Txhawm rau kom cov kev sib txuam xim thiab cov kev tiv thaiv siab ntawm cov xim, cov xim yuav tsum yog tusyees dispersed hauv lub system. Qhov kev sib txuas ntawm HPMC tuaj yeem txhim kho cov dispmation ntawm cov xim xim, yog li cov xim xim zoo nyob rau hauv cov xim xim, tiv thaiv kom tsis txhob sib xws ntawm cov xim txheej txheej. Ib qho ntxiv, lub wettability ntawm HPMC ua rau kom zoo txo cov agglomeration ntawm cov khoom siv xim thiab ua kom cov xim pleev xim.
Tiv thaiv kev txig thiab txhuam cov cim thaum lub sijhawm ua kev tsim kho, tshwj xeeb tshaj yog los ntawm kev txau thiab txhuam hniav thiab cov xim pleev xim rau cov teeb meem ntawm kev sib cais thiab txhuam cov cim. Kev sib cais tsis tsuas yog nkim cov ntaub ntawv, tab sis kuj yuav ua rau lub chaw tsim khoom siv, thaum txhuam cov cim cuam tshuam rau lub smoothness cuam tshuam rau lub smoothness thiab loog ntawm txheej kawg. HPMC tuaj yeem txo qhov kev sib cais ntawm cov xim uas tsim los ntawm kev kho lub piscosity thiab tib lub sijhawm ua rau cov xim Flowly nyob rau saum npoo thiab txo ntau tiam ntawm txhuam txhuam.
Cuam tshuam rau txheej tsim txheej txheej txheej txheem yog cuam tshuam los ntawm cov khoom sib dhos thiab cov txheej txheem kom qhuav ntawm cov xim. Vim nws cov yeeb yaj kiab zoo-tsim thiab dej khaws cia, txhim kho cov xim ua kom zoo dua qub, txhim kho cov txheej txheem ua kom qhuav thiab huab cua tsis kam ntawm cov txheej. Nyob rau tib lub sijhawm, nws tseem tuaj yeem txhim kho cov nplaum ntawm txheej, kom cov txheej txheej muaj cov khoom sib txawv zoo dua rau ntawm cov sib txawv ntawm cov txheej txheem ntawm txheej.
Daim ntawv thov HPMC nyob rau ntau hom kev sib txawv
HPMC tuaj yeem siv tau dav hauv ntau hom kev pleev xim xws li cov xim tha xim dej, xim pleev xim rau cov xim yas, thiab cov xim kos duab. Rau cov xim pleev xim rau cov dej, HPMC tuaj yeem txhim kho nws qhov viscosity, kev ua haujlwm theem thiab kev tsim kho; Hauv cov xim tsev zoo, HPMC lub tshuab ua tuab thiab dej khaws cia muaj tshwj xeeb tshaj yog ua tau zoo, txhim kho qhov ua tau zoo thiab cov xim zoo ntawm cov xim. Hauv thaj teb kws kos duab txheej txheem ua yeeb yam, HPMC txhim kho cov tshuaj tiv thaiv sagging thiab anti-splashing cov yam ntxwv ntawm cov xim, yoog raws kev xav tau ntawm kev tsim kho loj.
HPMC, raws li cov tuab tuab tuab thiab rheology kho kom zoo, ua lub luag haujlwm tseem ceeb hauv cov xim pleev xim thiab pleev xim. Nws tsis tuaj yeem txhim kho cov txheej txheem rheological ntawm txheej, xyuas kom cov txheej txheem zoo nkauj thiab txuas ntxiv rau cov txheej thiab kev pabcuam lub neej ntawm txheej. Nrog kev txhim kho kev lag luam tas li ntawm cov kev lag luam niaj hnub, daim ntawv thov HPMC yuav dhau los ua kev txhawb nqa ntau dua los txhim kho kev ua haujlwm ntawm kev ua tau zoo.
Lub Sijhawm Post: Sep-29-2024