HPMC (hydroxypropyl methylcellulose)yog ib qho tshuaj polymer uas siv dav hauv cov khoom cement. Nws muaj cov khoom zoo heev uas ua rau tuab, tawg, khaws dej thiab nplaum, yog li nws tuaj yeem txhim kho kev ua tau zoo ntawm cov khoom cement. Hauv kev tsim khoom thiab kev siv cov khoom cement, lawv feem ntau ntsib teeb meem xws li txhim kho kev ntws, txhim kho kev tiv thaiv kab nrib pleb, thiab txhim kho lub zog. Kev ntxiv HPMC tuaj yeem daws cov teeb meem no tau zoo.
1. Txhim kho qhov fluidity thiab workability ntawm cement slurry
Hauv cov txheej txheem tsim cov khoom cement, qhov fluidity yog ib qho tseem ceeb uas cuam tshuam rau kev ua haujlwm tsim kho thiab qhov zoo ntawm cov khoom. Ua ib qho polymer thickener, HPMC tuaj yeem tsim cov qauv colloidal network ruaj khov hauv cov cement slurry, yog li ua kom zoo dua qhov fluidity thiab kev ua haujlwm ntawm cov slurry. Nws tuaj yeem txo qhov sib txawv viscosity 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 tau qhov sib xws ntawm cov cement slurry, tiv thaiv cov cement slurry los ntawm kev sib cais thaum lub sijhawm sib tov, thiab txhim kho kev ua haujlwm thaum lub sijhawm tsim kho.
2. Txhim kho qhov khaws dej ntawm cov khoom cement
Cov txheej txheem hydration ntawm cement yog qhov tseem ceeb rau kev tsim lub zog ntawm cov khoom cement. Txawm li cas los xij, yog tias cov dej hauv cov cement slurry evaporates lossis ploj sai dhau, qhov kev ua kom hydration yuav tsis tiav, yog li cuam tshuam rau lub zog thiab compactness ntawm cov khoom cement. HPMC muaj cov dej khaws cia zoo, uas tuaj yeem nqus dej tau zoo, ncua qhov evaporation ntawm dej, thiab tswj cov dej noo ntawm cov cement slurry ntawm qib ruaj khov, yog li pab txhawb rau qhov ua kom tiav ntawm cov cement, yog li txhim kho lub zog thiab lub zog ntawm cov khoom cement. Ceev.
3. Txhim kho qhov tawg tsis kam thiab tawv ntawm cov khoom cement
Cov khoom siv cement feem ntau yuav tawg thaum lub sijhawm ua kom tawv, tshwj xeeb tshaj yog cov tawg uas ntsws vim yog poob dej sai sai thaum lub sijhawm ziab. Kev ntxiv HPMC tuaj yeem txhim kho qhov tsis kam ntawm cov khoom siv cement los ntawm kev ua kom cov viscoelasticity ntawm cov slurry nce ntxiv. Cov qauv molecular ntawm HPMC tuaj yeem tsim cov qauv network hauv cement, uas pab faib cov kev ntxhov siab sab hauv thiab txo qhov kev ntxhov siab ntsws thaum lub sijhawm ua kom tawv cement, yog li txo qhov tshwm sim ntawm cov kab nrib pleb. Tsis tas li ntawd, HPMC kuj tseem tuaj yeem txhim kho qhov tawv ntawm cov khoom siv cement, ua rau lawv tsis tshua tawg thaum qhuav lossis kub qis.
4. Txhim kho qhov tsis kam dej thiab kev ua haujlwm ntev ntawm cov khoom siv cement
Qhov ruaj khov thiab tsis kam dej ntawm cov khoom cement muaj feem cuam tshuam ncaj qha rau lawv cov kev ua tau zoo hauv qhov chaw nyuaj. HPMC tuaj yeem tsim cov zaj duab xis ruaj khov hauv cov cement slurry kom txo qhov nkag mus ntawm cov dej noo thiab lwm yam tshuaj lom neeg. Nws kuj tseem tuaj yeem txhim kho qhov tsis kam dej ntawm cov khoom cement los ntawm kev txhim kho qhov ceev ntawm cement thiab txhim kho qhov tsis kam ntawm cov khoom cement rau cov dej noo. Thaum siv ntev, cov khoom cement ruaj khov dua hauv cov av noo siab lossis cov chaw hauv qab dej, tsis tshua muaj kev yaj thiab kev yaig, thiab ntev lawv lub neej kev pabcuam.
5. Txhim kho lub zog thiab qhov ceev ntawm cov khoom cement
Thaum lub sijhawm ua cov txheej txheem hydration ntawm cov khoom cement, qhov ntxiv ntawm HPMC tuaj yeem txhawb kev sib kis ntawm cov khoom cement hauv cov cement slurry thiab ua rau thaj chaw sib cuag ntawm cov khoom cement, yog li ua rau kom muaj dej ntau ntxiv thiab lub zog loj hlob ntawm cement. Tsis tas li ntawd, HPMC tuaj yeem ua kom zoo dua qhov kev sib txuas ntawm cement thiab dej, txhim kho kev loj hlob ntawm lub zog thaum ntxov, ua rau cov txheej txheem tawv ntawm cov khoom cement sib xws dua, thiab yog li txhim kho lub zog kawg. Hauv qee qhov kev siv tshwj xeeb, HPMC kuj tseem tuaj yeem kho qhov dej ntau ntxiv ntawm cement kom hloov kho rau cov kev xav tau ntawm kev tsim kho hauv ntau qhov chaw sib txawv.
6. Txhim kho qhov tsos thiab qhov zoo ntawm cov khoom siv cement
Qhov zoo ntawm cov khoom cement yog qhov tseem ceeb rau qhov siv kawg, tshwj xeeb tshaj yog hauv kev tsim kho siab thiab cov khoom dai kom zoo nkauj, qhov twg qhov tiaj tus thiab du ntawm qhov tsos yog ib qho ntawm cov yam tseem ceeb los ntsuas qhov zoo. Los ntawm kev kho qhov viscosity thiab rheological cov khoom ntawm cov cement slurry, HPMC tuaj yeem txo cov teeb meem xws li npuas, qhov tsis xws luag, thiab kev faib tsis sib xws, yog li ua rau qhov chaw ntawm cov khoom cement du thiab du, thiab txhim kho qhov zoo ntawm qhov tsos. Hauv qee cov khoom cement dai kom zoo nkauj, kev siv HPMC kuj tseem tuaj yeem txhim kho qhov sib xws thiab ruaj khov ntawm lawv cov xim, muab cov khoom zoo nkauj dua.
7. Txhim kho qhov kev tiv thaiv te ntawm cov khoom cement
Cov khoom siv cement siv rau hauv qhov chaw kub qis yuav tsum muaj qee qib ntawm kev tiv thaiv te kom tiv thaiv kev tawg thiab kev puas tsuaj los ntawm kev khov-thaw voj voog. HPMC tuaj yeem txhim kho kev tiv thaiv te ntawm cov khoom cement los ntawm kev txhim kho kev ruaj khov ntawm cov cement slurry. Los ntawm kev txhim kho qhov compact ntawm cov khoom cement thiab txo cov dej noo ntawm cov qhov hws cement, HPMC txhim kho kev tiv thaiv te ntawm cov khoom cement nyob rau hauv qhov kub qis thiab zam kev puas tsuaj ntawm cov qauv los ntawm kev nthuav dav ntawm cement vim khov dej.
Daim ntawv thov ntawmHPMCHauv cov khoom 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 tsis tsuas yog tuaj yeem txhim kho qhov fluidity, dej tuav, tawg tsis kam thiab lub zog ntawm cov khoom cement, tab sis kuj txhim kho qhov zoo ntawm qhov chaw, ruaj khov thiab te tsis kam ntawm cov khoom cement. Raws li kev lag luam kev tsim kho txuas ntxiv txhim kho cov kev xav tau kev ua tau zoo ntawm cov khoom cement, HPMC yuav raug siv ntau dua thiab dav dua los muab kev txhawb nqa kev ua tau zoo dua thiab ruaj khov rau kev tsim khoom thiab kev siv cov khoom cement.
Lub sijhawm tshaj tawm: Lub Kaum Ob Hlis-06-2024