HydroxyPropyyl methylcellulose (HPMC)Yog ib qho tseem ceeb hauv tsev cov khoom siv ntxiv, siv dav hauv txoj kev cug cug, cug qhuav, cov txheej txheem thiab lwm thaj teb. HPMC ua si lub luag haujlwm tseem ceeb hauv dej ua kom khib nyiab ntawm cug, thiab tuaj yeem txhim kho qhov kev ua haujlwm, fluhesion thiab catch captis liab. Tshwj xeeb tshaj yog nyob rau hauv kev tsim kho niaj hnub, nws plays ib lub luag haujlwm irreplacleable hauv kev txhim kho qhov zoo thiab kev siv cov tshuaj khib.
1. Cov yam ntxwv ntawm HPMC
HPMC yog lub cellulose derivative hloov los ntawm cellulose hloov chemistry, nrog dej solubility zoo, nplaum thiab thickening cov khoom. Kev txhawj xeeb ® Nws lub luag haujlwm tseem muaj xws li cov dej ua kom tuab, txhim kho cov rheology thiab adhesion ntawm tshuaj khib, thiab lwm yam.
2. Kev txhais thiab qhov tseem ceeb ntawm Dej Tuav
Dej ceev ceev ntawm cult yog hais txog kev muaj peev xwm ntawm collch los khaws dej thaum cov txheej txheem kev tsim kho. Cov dej poob ntawm txoj kab hlig ncaj qha cuam tshuam nws cov txheej txheem tawv, lub zog thiab qhov ua tau zoo kawg nkaus. Yog tias cov dej yaj tau sai dhau sai, cov cement thiab lwm yam khoom siv rau hauv lub cev ua kom txaus siab yuav tsis muaj kuab tshuaj txaus thiab tsis muaj kuab. Yog li ntawd, cov dej zoo khaws cia yog tus yuam sij los ua kom muaj kev sib khib.
3. Cov nyhuv ntawm HPMC ntawm Cug Kev Khaws Dej Ua Haujlwm
Qhov kev sib txuas ntawm HPMC rau tshuaj khib tau txhim kho cov dej rov qab los tuav cov tshuaj khib, uas yog qhia meej tshwj xeeb hauv cov hauv qab no:
(1) Txhim kho cov dej ua kom rov ua tshuaj khab
HPMC tuaj yeem tsim cov qauv hydrogel-zoo li cov kab tsuag rau hauv cov dej khib nyiab, uas tuaj yeem nqus thiab khaws cov dej ntau, yog li ncua ntawm cov dej evaporation. Tshwj xeeb tshaj yog thaum tsim hauv qhov kub thiab txias lossis qhuav ib puag ncig, dej tuav tseg ntawm HPMC ua lub luag haujlwm tseem ceeb. Los ntawm kev txhim kho cov dej cia, HPMC tuaj yeem ua kom cov dej hauv cov tshuaj khib nyiab tau sib xyaw ntawm cov cement thiab txhim kho lub zog ntawm lub cug.
(2) txhim kho cov fluidity thiab cov haujlwm ntawm cug
Thaum lub sij hawm tsim qauv, lub tshuaj txaws yuav tsum muaj lub felliticy kom pab txhawb kev ua haujlwm ntawm cov neeg ua haujlwm pabcuam. Dej zoo khaws cia yuav ua rau qeeb qeeb ntawm cov tshuaj khib nyiab, ua rau nws ntau du tshuab ua haujlwm nqa cov haujlwm xws li smearing thiab scraping. Tsis tas li ntawd, HPMC kuj tseem tuaj yeem txhim kho cov viscosity ntawm cug cug thiab tiv thaiv kev muab tshuaj khib sib cais lossis kev ua kom huv, tsis muaj kev tswj hwm nws txoj kev sib xws.
(3) tiv thaiv kab cug ntsug saum npoo tawg
Tom qab HPMC txhim kho cov dej khib nyiab, nws tuaj yeem txo cov dej evaporation ntawm lub tshuaj khib thiab txo qhov kev pheej hmoo ntawm kev tawg. Tshwj xeeb tshaj yog nyob rau ib puag ncig nrog cov cua sov siab lossis cov av noo, dej evaporation tau yooj yim ua rau muaj kab cug ntawm lub cug kab. HPMC pab tswj cov dej noo tshuav ntawm kab tshuaj khib los ntawm kev ua kom huv ntawm cov dej khib nyiab thiab zam kev tsim cov kab nrib pleb.
(4) ntev lub sij hawm qhib ntawm cug
Lub sijhawm qhib ntawm collh hais txog lub sijhawm uas cug cug yuav ua haujlwm thaum lub sijhawm tsim kho. Lub sijhawm luv luv yuav cuam tshuam kev ua haujlwm zoo. Qhov kev sib txuas ntawm HPMC tuaj yeem ua tau zoo ntev lub sij hawm cap, muab cov chaw ua haujlwm siv sijhawm ntau dua los ua cov haujlwm xws li scraping thiab smearing. Tshwj xeeb tshaj yog nyob rau hauv cov chaw ua haujlwm nyuaj, ua kom lub sijhawm qhib qhib tuaj yeem ua kom cov nplaum thiab ua haujlwm ntawm cug.
4. Mechanism ntawm HPMC cov cawv ntawm cug dej khaws cia
Lub ntsiab lus tseem ceeb ntawm HPMC hauv kev txhim kho cap dej khaws cia yog raws li hauv qab no:
(1) Kev tswj cov dej thiab cov qauv molecular
HPMC lwg me me muaj ntau ntawm hydrophilic hydroxyl (-H) thiab hydroxypropyl thiab txhim kho cov adsorption ntawm cov lwg dej. Tsis tas li ntawd, HPMC muaj cov qauv molecular loj thiab tuaj yeem tsim cov qauv sib txuas hauv lub tshuaj txau, uas tuaj yeem ntes thiab khaws cov dej evaporate thiab qeeb qeeb.
(2) Nce cov xwm yeem thiab viscosity ntawm lub tshuaj khib
Thaum txhawj xeeb ®hpmc yog ntxiv rau lub thickener, nws yuav cuam tshuam qhov sib xws thiab vortcosity ntawm cap, ua rau lub tshuaj khib ntau dua thiab txo cov dej poob. Tshwj xeeb tshaj yog nyob rau hauv ib puag ncig kev tsim kho qhuav, cov nyhuv tuab ntawm HPMC pab txhim kho cov tshuaj khib kev tawm tsam kev ua haujlwm.
(3) Txhim kho cov txheej txheem ruaj ntseg ntawm lub tshuaj khib
HPMC tuaj yeem txhim kho cov cohesion ntawm lub tshuaj khib thiab txhim kho cov qauv kev ruaj ntseg ntawm nws cov kev sib txuam. Cov kev ruaj khov no tso cai rau lub cug tshuaj kom raug tswj xyuas ntawm cov tshuaj xis nyob ntev, yog li ua kom muaj zog ntawm cov xis ntawm lub cug.
5. Cov nyhuv ntawm HPMC nyob rau hauv cov ntawv thov siv
Hauv kev siv cov ntawv thov,HPMCFeem ntau yog siv ua ke nrog lwm cov tshuaj ntxiv (xws li cov yas tshuab, dispersants, thiab lwm yam) kom ua tiav cov tshuaj cug zoo tshaj plaws. Los ntawm cov kev sib tw tsim nyog, HPMC tuaj yeem ua si sib txawv hauv ntau hom kev ua pob. Piv txwv li, hauv collection cug cug, cem cov tshuaj khib, nws tuaj yeem txhim kho cov dej khaws cia thiab lwm yam khoom ntawm lub cug cug.
Lub luag haujlwm ntawm HPMC hauv tshuaj khib tsis tuaj yeem xav tsis thoob. Nws tseem ceeb txhim kho qhov zoo thiab siv cov txiaj ntsig ntawm kev txhim kho cov dej tshem tawm ntawm cug, txuas lub sijhawm qhib, thiab txhim kho kev tsim kho. Hauv kev tsim kho niaj hnub, nrog kev ua kom zoo dua ntawm kev siv tshuab thiab kev txhim kho kev txuas ntxiv rau, HPMC, raws li tus tseem ceeb ntxiv, yog ua rau muaj txoj haujlwm tseem ceeb ntxiv.
Lub sijhawm Post: Feb-15-2025