HPMC (HydroxyPropyyl methylcellulose) yog cov multifunctional polymer ntxiv cov khoom siv hauv cov ntaub ntawv hauv tsev, tshwj xeeb yog cov khoom siv caas. Cov lus qhia ntawm HPMC tuaj yeem txhim kho cov khoom ua tau zoo ntawm cov khoom siv rau kev ua kom khov, ua haujlwm ua haujlwm, yog li ua kom muaj kev phom sij rau qhov tshwm sim ntawm kev tawg.
Tshuaj lom neeg thiab lub cev ntawm HPMC
HPMC yog ib nrab hluavtaws polymer tshuaj hloov kho los ntawm cellulose. Nws cov qauv molecular suav nrog methyl thiab hydroxypropyl chaw, muab nws cim tshwj xeeb, thickening, dej tuav thiab ua yeeb yaj kiab-ua yeeb yam. Nws cov yam ntxwv tseem ceeb muaj:
Cov dej nplua nuj khaws cia: HPMC muaj cov dej ua kom zoo rau dej
Thickening cov nyhuv: HPMC tuaj yeem ua kom cov viscosity ntawm cov slurry, li kev txhim kho nws cov haujlwm ua haujlwm.
Zaj duab xis-ua cov khoom: nws cov yeeb yaj kiab zoo-tsim tau muaj peev xwm ua cov zaj duab xis hloov pauv ntawm cov khoom, muab kev tiv thaiv kev tiv thaiv kev tiv thaiv kev tiv thaiv zoo dua.
Lub tshuab hluav taws xob ntawm HPMC ntawm kev tawg ntawm cov khoom siv xis mas raws li cov ntaub ntawv
1. Dej khaws cia thiab txo cov shrinkage qhuav
Cov Khoom Siv Kev Lom Zem Tshaj Plaws Volumetric Shrinkage thaum Hardening, feem ntau vim dej poob thiab ua kom qhuav shrinkage. Kom qhuav shrinkage backs feem ntau yog tshwm sim los ntawm kev nrawm nrawm ntawm cov dej hauv lub cev tawv, ua rau cov khoom tsis sib xws, yog li ua rau tawg. Cov khoom siv dej-khaws cov khoom ntawm HPMC ua lub luag haujlwm tseem ceeb hauv no:
Zoov dej nce cov dej evaporation: HPMC khaws cov dej noo hauv cov cement slurry, yog li maj mam nqes tus nqi ntawm cov dej evaporation. Qhov kev ua haujlwm hauv cov dej no tsis tsuas pab kom ntev txog lub sijhawm ua haujlwm, tab sis kuj txo cov dej kom qhuav los ntawm dej evaporation.
Sib txig hydration Reaction Refration: Txij li thaum HPMC muab cov dej ntws ruaj khov, cov khoom noj kom loj hlob tuaj yeem ua rau muaj kev pheej hmoo thiab txo qhov kev pheej hmoo ntawm kev tawg.
2. Txhim kho cov viscosity thiab faib cov khoom sib luag ntawm cov ntaub ntawv
HPMC muaj cov nyhuv tuab, uas ua lub luag haujlwm tseem ceeb hauv kev txhim kho cov haujlwm ua haujlwm thiab kev sib txuam ntawm cov khoom siv xiss:
Nce Viscosity: HPMC nce viscosity ntawm slurry, txhim kho kev ua haujlwm thaum ntawv thov, tso cai rau cov neeg ua haujlwm tsis zoo thiab sau cov chaw cog qoob loo thiab cov chaw tsis sib xws.
Cov kev faib tawm niaj hnub: Los ntawm kev tawm viscosity ntawm slurry, HPMC ua rau kev faib tawm ntawm cov tub ntxhais kawm ua kom muaj kev ntxhov siab thiab kev txo qis vim muaj kev ntxhov siab hauv ib cheeb tsam.
3. Txhawb zaj duab xis-ua cov khoom thiab kev tiv thaiv nto
Zaj duab xis-tsim cov khoom ntawm HPMC pab kom cov txheej tiv thaiv nyob rau saum npoo ntawm cov khoom, uas muaj qhov cuam tshuam zoo ntawm kev txo cov kab nrib pleb
Cov kev tiv thaiv saum npoo: Tus sau zaj duab xis hloov tsim los ntawm HPMC nyob rau sab nraud ntawm cov khoom muaj peev xwm tiv thaiv ib puag ncig thiab muaj kev txo qhov tshwm sim ntawm cov kab nrib pleb.
Saj zawg zog cov kev pab cuam: Qhov yeeb yaj kiab no muaj qee qhov kev ntxhov siab me ntsis, yog li tiv thaiv me ntsis, yog li tiv thaiv me ntsis lossis qeeb qeeb ntawm cov kab nrib pleb.
4. Tswj cov txheej txheem hydration
HPMC tuaj yeem tswj hwm cov txheej txheem hydration ntawm cov cement, uas yog lub luag haujlwm tseem ceeb hauv kev txo cov kev ntxhov siab tsim los ntawm kev sib txawv:
Qeeb-tso IRUCKATION: HPMC tuaj yeem txo cov tshuaj tiv thaiv ceev ceev, yog li muab cov khoom siv co av me me thiab muaj kev txhawb nqa ib puag ncig. Cov nyhuv qeeb tawm no txo cov kev ntxhov siab los ntawm kev ua haujlwm hydren tsis sib xws, yog li txo qhov kev pheej hmoo ntawm kev tawg.
Cov piv txwv ntawm HPMC nyob rau hauv cov khoom siv xas-raws sib txawv
HPMC tau siv dav hauv cov ntaub ntawv tso tseg, suav nrog tab sis tsis txwv rau cov plag tsev tus kheej, cov tawv ntoo sab nrauv, cov khoom lag luam sab nrauv, cov khoom lag luam nyob sab nraud. Cov hauv qab no yog qee cov ntawv thov tshwj xeeb ua piv txwv:
1. Kev siv tus kheej hauv pem teb
Kev ntsuas tus kheej txoj kev xav tau cov khoom siv zoo thiab kev sib txuas lus thaum tsis txhob tawg sab nraud. HPMC txhim kho kev ntws thiab saum npoo ua tiav ntawm cov khoom los ntawm nws cov kev ua kom muaj dej ua kom muaj kev cuam tshuam thaum txo qhov tshwm sim ntawm qhov tawg.
2. Sab nrauv Phab Ntsa Xim
Cov xim sab nrauv yuav tsum muaj cov nplaum zoo thiab tawg tsis kam. Cov yeeb yaj kiab ua yeeb yam thiab cov dej khaws cia ntawm HPMC txhim kho cov txheej txheej txheem adhesion thiab yooj yim, yog li txhim kho txheej txheej tawm thiab huab cua.
3. Kho Cov Ntaub Ntawv
Cov pob zeb kho kom zoo kho cov ntaub ntawv xav tau lub zog siab thiab tawv sai thaum tswj cov shrinkage. HPMC muaj kev txuag dej zoo thiab tswj cov khoom siv kho kom haum kom muaj kev pheej hmoo qis thaum cov txheej txheem tawv me me thaum ua kom muaj kev pheej hmoo ntawm kev tawg tom qab kho.
Ceev faj rau kev siv HPMC
Txawm hais tias HPMC muaj qhov cuam tshuam loj hauv kev txo cov khoom tawg ntawm cov ntaub ntawv casent-raws li cov ntaub ntawv, cov ntsiab lus hauv qab no tseem yuav tsum tau sau tseg thaum siv:
Kev tswj ntau tshuaj tswj: cov tshuaj ntawm HPMC yuav tsum nruj me ntsis raws li cov qauv tsim. Ntau dhau los yog tsawg dhau yuav cuam tshuam rau cov khoom siv ua tau zoo. Feem ntau hais lus, cov nqi ntau npaum li cas ntawm 0.1% - 0.5%.
Sib tov sib xyaw: HPMC yuav tsum tau muab sib xyaw kom huv nrog lwm cov ntaub ntawv kom ntseeg tau tias nws ua haujlwm thoob plaws lub slurry.
Kev Tsim Kho: Cov kev tsim kho kom sov (xws li qhov ntsuas kub (vaum ntsig txog cov nyhuv ntawm HPMC, thiab yuav tsum tau hloov kho kom zoo raws li cov mob tshwj xeeb.
Raws li cov khoom siv cement zoo ntxiv, HPMC ua si lub luag haujlwm tseem ceeb hauv kev txo cov dej khov ntawm cov khoom noj kom tawg, thickening, zaj duab xis-ua thiab hydration tswj cov khoom. Nws noj cov dej evaporation, txhim kho cov khoom siv tau yooj yim, thiab tswj cov txheej txheem hydration, yog li cuam tshuam txog kev pheej hmoo ntawm kev tawg. Yog li ntawd, hauv daim ntawv thov cov khoom siv Maas-raws li cov khoom siv hauv HPMC tsis tuaj yeem txhim kho cov khoom siv tau zoo, tab sis kuj txuas ntxiv cov kev pabcuam lub neej thiab txo tus nqi kho.
Lub Sijhawm Post: Jun-26-2024