HPMC (Hydroxypropyl methylcellulose)yog ib qho polymer compound dav siv hauv cov khoom cement. Nws muaj cov thickening zoo heev, dispersing, tuav dej thiab cov khoom nplaum, yog li nws tuaj yeem txhim kho kev ua tau zoo ntawm cov khoom cement. Hauv kev tsim thiab siv cov txheej txheem ntawm cov khoom siv cement, lawv feem ntau ntsib teeb meem xws li kev txhim kho fluidity, txhim khu kev tiv thaiv tawg, thiab txhim kho lub zog. Qhov sib ntxiv ntawm HPMC tuaj yeem daws cov teeb meem no tau zoo.
1. Txhim kho fluidity thiab workability ntawm cement slurry
Hauv kev tsim cov khoom siv cement, fluidity yog ib qho tseem ceeb cuam tshuam rau kev tsim kho kev lag luam thiab cov khoom zoo. Raws li cov polymer thickener, HPMC tuaj yeem tsim cov qauv sib txuas sib txuas ruaj khov hauv cov cement slurry, yog li txhim kho cov dej ntws thiab kev ua haujlwm ntawm cov slurry. Nws tuaj yeem txo qhov viscosity sib txawv ntawm cov cement slurry, ua rau cov slurry ntau yas thiab yooj yim rau kev tsim kho thiab nchuav. Tsis tas li ntawd, HPMC tuaj yeem tswj xyuas qhov sib xws ntawm cov cement slurry, tiv thaiv cov cement slurry los ntawm kev sib cais thaum lub sij hawm sib tov, thiab txhim kho kev ua haujlwm thaum lub sij hawm tsim kho.
2. Txhim kho cov dej tuav ntawm cov khoom cement
Cov txheej txheem hydration ntawm cov cement yog tus yuam sij rau kev tsim lub zog ntawm cov khoom cement. Txawm li cas los xij, yog tias cov dej hauv cov cement slurry evaporates los yog poob sai heev, cov tshuaj tiv thaiv dej yuav ua tsis tiav, yog li cuam tshuam rau lub zog thiab compactness ntawm cov khoom cement. HPMC muaj cov dej tuav ruaj khov, uas tuaj yeem nqus dej tau zoo, ncua sijhawm cov dej ntws tawm, thiab tswj cov dej noo ntawm cov cement slurry ntawm cov qib ruaj khov, yog li ua rau cov dej tiav ntawm cov cement, yog li txhim kho lub zog thiab lub zog ntawm cov cement slurry. cov khoom siv cement. Qhov ntom.
3. Txhim kho qhov tawg tsis kam thiab toughness ntawm cov khoom cement
Cov khoom siv cement yog cov kab nrib pleb thaum lub sij hawm hardening txheej txheem, tshwj xeeb tshaj yog shrinkage kab nrib pleb tshwm sim los ntawm sai sai poob ntawm noo noo thaum lub sij hawm ziab. Qhov sib ntxiv ntawm HPMC tuaj yeem txhim kho qhov tawg tsis kam ntawm cov khoom cement los ntawm kev ua kom cov viscoelasticity ntawm slurry. Cov qauv molecular ntawm HPMC tuaj yeem tsim cov qauv sib txuas hauv cov cement, uas pab cuam tshuam cov kev ntxhov siab sab hauv thiab txo qis kev ntxhov siab thaum lub sij hawm cement hardening, yog li txo qhov tshwm sim ntawm cov kab nrib pleb. Tsis tas li ntawd, HPMC tseem tuaj yeem txhim kho qhov tawv ntawm cov khoom cement, ua rau lawv tsis tshua muaj kev tawg nyob rau hauv qhuav lossis kub kub.
4. Txhim kho cov dej tsis kam thiab kav ntev ntawm cov khoom cement
Lub durability thiab dej tsis kam ntawm cov khoom cement yog ncaj qha ntsig txog lawv cov kev ua tau zoo nyob rau hauv ib puag ncig hnyav. HPMC tuaj yeem tsim cov yeeb yaj kiab ruaj khov hauv cov cement slurry kom txo tau qhov nkag ntawm cov dej noo thiab lwm yam khoom tsis zoo. Nws tseem tuaj yeem txhim kho cov dej tsis kam ntawm cov khoom cement los ntawm kev txhim kho qhov ntom ntom ntawm cov cement thiab txhim kho cov khoom siv cement kom ya raws. Thaum siv mus sij hawm ntev, cov khoom siv cement yog ruaj khov nyob rau hauv high humidity los yog underwater ib puag ncig, tsis tshua muaj kev puas tsuaj thiab yaig, thiab ntev lawv cov kev pab cuam lub neej.
5. Txhim kho lub zog thiab hardening ceev ntawm cov khoom cement
Thaum lub sij hawm hydration cov txheej txheem ntawm cov khoom cement, qhov sib ntxiv ntawm HPMC tuaj yeem txhawb kev tawg ntawm cov cement hauv cov cement slurry thiab ua rau thaj chaw sib cuag ntawm cov khoom cement, yog li ua kom cov dej ntws thiab lub zog loj hlob ntawm cov cement. Tsis tas li ntawd, HPMC tuaj yeem txhim kho kev sib raug zoo ntawm cov cement thiab dej, txhim kho kev loj hlob thaum ntxov, ua kom cov txheej txheem hardening ntawm cov khoom cement ntau dua, thiab yog li txhim kho lub zog kawg. Hauv qee daim ntawv thov tshwj xeeb, HPMC kuj tuaj yeem kho tus nqi dej ntawm cov cement kom haum rau cov kev tsim kho hauv ntau qhov chaw.
6. Txhim kho qhov tsos thiab qhov zoo ntawm cov khoom cement
Cov tsos zoo ntawm cov khoom cement yog qhov tseem ceeb rau qhov kawg siv cov nyhuv, tshwj xeeb tshaj yog nyob rau hauv high-end kev tsim kho thiab cov khoom siv kho kom zoo nkauj, qhov twg cov flatness thiab smoothness ntawm cov tsos yog ib qho tseem ceeb ntawm kev ntsuas qhov zoo. Los ntawm kev kho cov viscosity thiab rheological zog ntawm cov cement slurry, HPMC tuaj yeem txo cov teeb meem xws li npuas, qhov tsis xws luag, thiab kev faib tsis sib luag, yog li ua rau cov khoom siv cement smoother thiab smoother, thiab txhim kho cov tsos zoo. Hauv qee cov khoom siv cement zoo nkauj, kev siv HPMC kuj tuaj yeem txhim kho qhov sib xws thiab kev ruaj ntseg ntawm lawv cov xim, muab cov khoom muag zoo nkauj dua.
7. Txhim kho cov Frost tsis kam ntawm cov khoom cement
Cov khoom siv cement siv nyob rau hauv qhov chaw qis qis yuav tsum muaj qee qhov kev tiv thaiv kev tiv thaiv kom tsis txhob muaj kab nrib pleb thiab kev puas tsuaj los ntawm lub voj voog khov-thaw. HPMC tuaj yeem txhim kho cov Frost tsis kam ntawm cov khoom cement los ntawm kev txhim kho cov qauv kev ruaj ntseg ntawm cov cement slurry. Los ntawm kev txhim kho cov compactness ntawm cov khoom cement thiab txo cov dej noo ntawm cov cement pores, HPMC txhim kho cov te tiv thaiv cov khoom cement nyob rau hauv qhov kub thiab txias thiab tsis txhob muaj kev puas tsuaj los ntawm kev nthuav dav ntawm cov cement vim yog dej khov.
Daim ntawv thov ntawmHPMCnyob rau hauv cov khoom siv cement muaj ntau yam zoo thiab tuaj yeem txhim kho kev ua tau zoo ntawm cov khoom cement los ntawm ntau yam txheej txheem. Nws tuaj yeem tsis tsuas yog txhim kho fluidity, dej tuav, tawg tsis kam thiab lub zog ntawm cov khoom cement, tab sis kuj txhim kho qhov zoo ntawm qhov chaw, durability thiab Frost tsis kam ntawm cov khoom cement. Raws li kev tsim kho kev lag luam txuas ntxiv txhim kho cov kev ua tau zoo ntawm cov khoom siv cement, HPMC yuav siv ntau dua thiab ntau dua los muab kev ruaj khov thiab muaj txiaj ntsig zoo rau kev tsim thiab siv cov khoom cement.
Post lub sij hawm: Dec-06-2024