HydroxyPropyyl methylulose (HPMC) yog lub cellulent tseem ceeb siv hauv cov khoom siv hauv tsev, tshwj xeeb tshaj yog nyob rau hauv tov cug. HPMC tsis tsuas yog txhim kho kev tsim kho ntawm tshuaj khib, tab sis kuj tseem txhim kho cov khoom siv thiab tshuaj lom neeg ntawm cov khoom tiav.
Cov yam ntxwv yooj yim ntawm HPMC
HPMC yog cov dej tsis-ionic-soluble polymer tshuaj hloov kho los ntawm cov cellulose ntuj. Nws cov khoom tseem ceeb suav nrog cov dej so kom zoo, ua yeeb yaj kiab ua yeeb yam, cov nplaum, tuab thiab ruaj khov. Cov khoom no ua HPMC tau zoo heev hauv ntau cov ntawv thov, tshwj xeeb tshaj yog nyob rau hauv cov qauv hauv kev tsim kho kev tsim kho.
Lub luag haujlwm ntawm HPMC hauv kev txig sib xyaw
Txhim Kho Dej Tuav
HPMC muaj cov khoom siv tau zoo thiab muaj peev xwm txhim kho cov dej khaws cov tshuaj cug. Nws swells nyob rau hauv dej thiab ua cov gel-zoo li kev daws, uas tuaj yeem txo cov dej evaporation thiab poob, yog li ua kom lub tshuaj khib ntub. Qhov kev ua kom muaj txiaj ntsig los ntawm cov dej no yog qhov tseem ceeb rau kev nce qib ntawm cov xis ntawm lub zog ntawm cov tshuaj khib thiab txo qhov kev pheej hmoo ntawm kev tawg.
thickening nyhuv
Thaum HPMC yog yaj hauv dej, nws yuav ua rau lub hom phiaj colloidal, nce viscosity ntawm cov tshuaj khib. Cov nyhuv thickening tuaj yeem txhim kho cov sag tiv thaiv cov tshuaj khib, ua kom nws yooj yim rau kev thov thiab ua cov tshuaj khib thaum kev tsim kho. Qhov no pab cov tsim vaj tse siv cug ntawm cov kab ntsug xws li phab ntsa kom tiv thaiv kev tshuaj khib los ntawm ntws lossis poob.
Txhim Kho Kev Ua Haujlwm
Vim tias HPMC txhim kho lub txiv ntoo thiab cov yas ntawm cov tshuaj khib, nws ua rau nws yooj yim dua, twj tso kua mis thiab kis tau. Txoj kev txhim kho no ua rau muaj kev txhim kho yooj yim dua thiab nce ntxiv kev ua haujlwm. Nyob rau tib lub sijhawm, nws kuj tseem tuaj yeem txhim kho lub thixotropy ntawm cug tshuab nqus thaum raug shear zog thiab thicker thaum nyob ruaj ruaj, uas tau txais txiaj ntsig zoo rau kev ua haujlwm.
Txhim kho adheesion
Tus qauv colloidal tsim los ntawm HPMC hauv kev tshuaj khib nyiab tuaj yeem txhim kho txoj kev sib tsoo ntawm lub tshuaj khib thiab cov khoom siv. Cov nplaum txhim kho yog qhov tseem ceeb hauv cov ntawv thov xws li Pobzeb Txheej Txheem Cug lossis Rwb thaiv cov kab hlau kom tiv thaiv cov khoom los ntawm kev pleev tshuaj los ntawm kev pleev tshuaj los ntawm cov tev thiab delaminating.
Tswj cracking
Txij li thaum HPMC tuaj yeem txhim kho cov dej tshem tawm, nws pab txo qhov kev tsim ntawm cov shrinkage thaum ntxov. Tsis tas li ntawd, nws cov khoom siv tuab ntxiv kuj tsis muaj kev ntxhov siab thiab txo cov kab nrib pleb tshwm sim los ntawm qhov kub thiab txias hloov los yog shrinkage ntawm substrate.
Kev Ntsuam Xyuas Cov Txheej Txheem
Molecular qauv thiab dej ua ke
Cov qauv molecular ntawm HPMC muaj ntau pawg hydrophilic, xws li hydroxyl thiab methoxy pawg. Cov pab pawg nruab nrab no ua cov lwg dej, muab HPMC lub peev xwm muaj zog los nqus thiab khaws dej. Thaum HPMC tau yaj nyob hauv dej, lawv tsim ib qho cuab yeej cuab tam uas muaj cov qauv siv hluav taws xob uas khaws cov dej los ntawm kev kos duab lub cev thiab tshuaj lom neeg.
Colloid tsim thiab thickening
Nyob rau hauv cug vaph, hpmc dissolves los ua ib qho kev daws colloidal. Qhov kev daws colloidal no ua rau vov taws hauv lub tshuaj khib thiab nce qhov viscosity tag nrho ntawm cov tshuaj khib. HPMC molecular chains peet tsim kho lub network ruaj khov los ntawm kev koom tes thiab lub cev ua lub cev, nyob ntawm lub cev ua kom viscosity ntawm lub tshuaj khib.
Lubrication thiab Kev Ua Haujlwm
HPMC molecular chains ua raws li lubricants nyob rau hauv cug. Lawv tuaj yeem tsim cov yeeb yaj kiab lubricating nyob rau saum npoo ntawm cov lus sib sau ua ke, txo qhov kev sib txhuam ntawm cov khoom sib txhuam. Cov ntaub xyaws no ua rau cov tshuaj khib yooj yim kom do thiab txua, txhim kho kev txhim kho smoothness.
Interfacial adhesion thiab cohesion
Tus qauv colloidal ntawm HPMC yuav tsim ib zaj duab xis nyias tom qab ziab. Cov yeeb yaj kiab nyias nyias tuaj yeem ua tau zoo rau cov npoo ntawm cov khoom siv hauv paus thiab txhim kho txoj kev sib raug zoo ntawm lub tshuaj khib thiab cov khoom siv. Cov nyhuv no yog qhov tseem ceeb heev rau kev txhim kho cov nplaum ntawm cug cug.
Cov Piv Txwv Ua Ntawv Piv Txwv ntawm HPMC
Pobzeb Cov Tshuaj Khib Khib
Nyob rau hauv ceramic nplais mortars, cov dej ua kom muaj zog thiab sib xyaw ua ke ntawm cov vuas ntub dej, tiv thaiv cov vuas luaj ntub dej los ntawm kev poob thiab zawv zawg thaum lub sijhawm ua kom qhuav.
Plastering Cug
Nyob rau hauv plastering mortars, cov nyhuv tuab ntawm HPMC ua rau nws tau yooj yim dua rau cov kab cug rau ntawm phab ntsa thiab tiv thaiv kev tshuaj khib los ntawm kev poob. Nws cov dej zoo siv dej kom txo qis kev pheej hmoo ntawm cov nrib pleb hauv txheej txheej plaster.
CUG SELFLING CUG
Rau kev coj tus kheej txoj kab sib nraus, lub thixotrostries thiab lubriccc ntseeg tau tias lub tshuaj khib nyiab kom zoo thaum ruaj khov, uas yooj yim rau kev tsim kho kev tsim kho.
Lub luag haujlwm ntawm HPMC hauv qhuav-colleded cug yog multifaceted. Nws tsis tsuas yog txhim kho kev tshuaj khib los ntawm kev txhim kho dej khaws cia thiab thickening cov khoom, tab sis kuj ua rau kev txhim kho cov txiaj ntsig ua haujlwm thiab cov nplaum. Daim ntawv thov ntawm HPMC tau qhib cug c tov qhuav ua kom tau dav siv hauv kev tsim kho niaj hnub, txhim kho kev ua haujlwm zoo thiab ua tau zoo ntawm kev tsim kho. Yav tom ntej, nrog kev nce qib nruam ntawm cov ntaub ntawv siv thev naus laus zis, daim ntawv thov tau txais kev txuas ntxiv thiab txhim kho.
Lub Sijhawm Post: Feb-17-2025