Hydroxypropyl Methylcellulose (HPMC) yog cov khoom siv dej-soluble polymer uas tau siv dav hauv cov khoom siv hauv tsev, txheej, tshuaj, khoom noj thiab lwm yam. Hauv kev tsim cov cement, HPMC tau siv ntau ntxiv. Nws qhov kev ua tau zoo tshwj xeeb thiab cov yam ntxwv zoo tshaj plaws ua rau nws yog qhov tseem ceeb ntawm cov khoom siv cement.
1. Txhim kho kev ua haujlwm thiab kev tsim kho
HPMC tuaj yeem txhim kho kev ua haujlwm ntawm cov cement sib tov. Nyob rau hauv cov txheej txheem tsim cov cement, fluidity thiab cohesiveness ntawm qhov sib tov yog qhov tseem ceeb cuam tshuam rau kev tsim kho kom zoo. HPMC muaj cov khoom tawg yooj yim thiab thickening hauv dej, ua rau cov cement slurry yooj yim rau do, ncuav thiab du thaum siv. Qhov kev txhim kho no tsis yog tsuas yog txhim kho kev ua haujlwm ntawm kev tsim kho, tab sis kuj txo qhov tsim ntawm npuas thiab ua kom lub compactness thiab tag nrho cov zoo ntawm cov pob zeb.
2. Txhim kho dej tuav
HPMC muaj cov khoom tuav dej zoo heev thiab tuaj yeem txo cov dej evaporation zoo. Qhov no yog qhov tseem ceeb rau cov txheej txheem kho cov khoom cement. Cement yuav tsum muaj dej txaus rau cov tshuaj tiv thaiv dej thaum lub sijhawm kho, thiab kev siv HPMC tuaj yeem txuas ntxiv lub sijhawm khaws dej ntawm cov cement slurry thiab xyuas kom meej tias cov dej tuaj yeem nkag mus rau hauv cov cement particles, yog li txhim kho lub zog thiab kav ntev ntawm cov cement. Tshwj xeeb tshaj yog nyob rau hauv qhov kub thiab txias ib puag ncig, cov dej khaws cia ntawm HPMC yog qhov tseem ceeb tshwj xeeb.
3. Txhim khu kev ua kom tawg
Hauv kev tsim thiab siv cov khoom siv cement, qhov tshwm sim ntawm cov kab nrib pleb yog ib qho teeb meem tshwm sim. Kev siv HPMC tuaj yeem txo qhov tshwm sim ntawm cov kab nrib pleb. Vim nws cov dej tuav tau zoo, HPMC tuaj yeem txo qis qis qis los ntawm cov dej evaporation, yog li txo qhov kev pheej hmoo ntawm cov kab nrib pleb los ntawm shrinkage. Tsis tas li ntawd, HPMC tseem tuaj yeem tsim cov qauv sib txuas hauv cov cement matrix, ua rau kom muaj zog thiab tawg tsis kam ntawm cov khoom, thiab txhim kho tag nrho cov kav ntev.
4. Txhim kho adhesion
HPMC tuaj yeem txhim kho lub zog sib txuas ntawm cov cement thiab substrate. Tshwj xeeb tshaj yog thaum siv cov ntaub ntawv hmoov, cov khoom thickening ntawm HPMC tuaj yeem txhim kho qhov adhesion ntawm cov cement slurry. Rau kev siv cov nplais nplaum, gypsum thiab lwm yam khoom siv hauv tsev, HPMC tuaj yeem ua kom muaj kev sib raug zoo ntawm cov ntaub ntawv, tiv thaiv hollowing thiab ntog tawm, thiab xyuas kom muaj kev tsim kho zoo.
5. Txhim kho kev txav mus los thiab ua haujlwm tau zoo
Qhov sib ntxiv ntawm HPMC tuaj yeem txhim kho qhov fluidity ntawm cov cement slurry, ua kom cov sib tov sib npaug thiab yooj yim rau kev tsim thaum lub sij hawm tsim kho. Tshwj xeeb tshaj yog nyob rau hauv cov qauv uas muaj cov ntsiab lus muab tub lim siab, HPMC tuaj yeem txo qhov viscosity ntawm cov khoom sib tov thiab txhim kho nws cov dej ntws, yog li txhim kho qhov yooj yim ntawm kev tsim kho. Qhov no yog qhov tseem ceeb tshwj xeeb hauv kev tsim kho loj, uas tuaj yeem txhim kho kev ua tau zoo thiab kev tsim kho kom zoo.
6. Muaj zog adaptability
HPMC muaj qhov hloov tau dav thiab sib haum nrog ntau hom cement thiab lwm yam khoom ntxiv. Txawm hais tias nws yog Portland cement zoo tib yam, ceev ceev cov cement, lossis cov cement tshwj xeeb, HPMC tuaj yeem siv nws qhov zoo. Tsis tas li ntawd, HPMC tseem tuaj yeem siv ua ke nrog lwm cov tshuaj ntxiv (xws li cov neeg ua haujlwm hauv huab cua, cov dej txo cov neeg ua haujlwm, thiab lwm yam) txhawm rau txhim kho cov kev ua tau zoo ntawm cov pob zeb thiab ua tau raws li cov kev xav tau sib txawv.
7. Txhim kho cov kav ntev
Cov khoom siv cement siv HPMC muaj qhov ua tau zoo heev. HPMC tuaj yeem tiv thaiv kev laus thiab kev puas tsuaj ntawm cov cement substrates thiab txhim kho lawv cov kua qaub thiab alkali tsis kam, noo noo tsis kam, thiab khov-thaw kuj. Los ntawm kev txo cov dej poob, HPMC xyuas kom meej tias cov cement tuaj yeem ua rau lub sijhawm ua dej, ua rau muaj zog thiab kav ntev. Qhov no yog qhov tseem ceeb rau kev siv mus ntev thiab tu cov khoom siv hauv tsev.
8. Ntsuab thiab ib puag ncig tus phooj ywg
Raws li cov khoom siv polymer ntuj, HPMC muaj kev tiv thaiv ib puag ncig zoo. Tsis muaj cov tshuaj phem yuav raug tso tawm thaum lub sijhawm tsim khoom thiab siv, thiab nws ua tau raws li cov kev cai ntawm cov tsev ntsuab niaj hnub. Nrog rau kev txhim kho txuas ntxiv ntawm kev tiv thaiv ib puag ncig hauv kev tsim kho kev lag luam, daim ntawv thov ntawm HPMC tau txais kev saib xyuas ntau dua. Cov khoom siv cement siv HPMC ua tiav kev ua haujlwm siab thaum tseem ua rau muaj kev tiv thaiv ib puag ncig.
9. Tus nqi zoo
Txawm hais tias tus nqi ntawm HPMC hauv kev tsim khoom yog qhov siab, ntau qhov zoo uas nws coj tuaj yeem txo qis kev siv lwm yam khoom ntxiv, yog li ua kom zoo dua tus nqi tag nrho. Tsis tas li ntawd, kev siv HPMC tuaj yeem txhim kho kev tsim kho kom zoo thiab txo lub sijhawm tsim kho, yog li txo cov nqi tsim kho ntxiv. Zuag qhia tag nrho, daim ntawv thov ntawm HPMC yog kev lag luam ua tau.
HPMC muaj ntau yam zoo hauv kev tsim cov cement, suav nrog kev txhim kho kev ua haujlwm, kev tuav dej, tawg tsis kam, adhesion, fluidity, thiab lwm yam. Raws li kev tsim kho kev lag luam cov kev xav tau ntawm cov khoom siv kev ua tau zoo txuas ntxiv mus ntxiv, daim ntawv thov ntawm HPMC yuav dhau los ua ntau thiab ntau dua, txhawb kev tsim cov khoom cement nyob rau hauv kev coj ua kom zoo dua qub thiab kev tiv thaiv ib puag ncig.
Post lub sij hawm: Lub Xya hli ntuj-22-2024