HPMC (Hydroxypropyl Methyl Cellulose) yog ib qho kev siv ntau ntxiv hauv cov cement mortar. Nws yog non-ionic cellulose ether tau los ntawm kev kho cellulose nrog methyl chloride thiab propylene oxide. HPMC yog dav siv nyob rau hauv kev tsim kho kev lag luam vim nws zoo heev dej tuav cov khoom, raws li ib tug thickener thiab binder, thiab los txhim kho lub workability thiab lub zog ntawm cement mortar. Hauv tsab xov xwm no, peb yuav tham txog cov txheej txheem ntawm kev ua ntawm cellulose ethers hauv cement mortar.
tuav dej
HPMC muaj cov khoom tuav dej zoo heev thiab tuaj yeem tswj cov dej ntawm cov cement mortar thaum lub sijhawm teeb tsa. Cov dej khaws cia ntawm HPMC pab cov txheej txheem dej ntawm cov cement thiab ncua cov txheej txheem ziab, yog li txhim kho lub zog ntawm cov cement mortar. Nws pab txo qis shrinkage, tiv thaiv kev tawg thiab txhim kho kev sib raug zoo. Thaum HPMC ntxiv rau cov cement mortar, nws tsim ib txheej tiv thaiv nyob ib ncig ntawm cov khoom hydration, ua kom tus nqi ntawm cov evaporation ntawm cov dej hauv mortar.
Txhim kho kev ua haujlwm
HPMC txhim kho kev ua haujlwm ntawm cov cement mortars los ntawm kev ua cov thickener thiab binder. Thaum sib xyaw nrog dej, HPMC tsim cov khoom zoo li gel uas ua rau cov viscosity ntawm qhov sib tov. Cov tshuaj zoo li gel no pab ua kom cov cement mortar nyob rau hauv qhov chaw thiab tsis khiav tawm ntawm cov pob qij txha thiab cov crevices. Kev txhim kho kev ua haujlwm ntawm cov cement mortar kuj yuav pab txo qis tus nqi tag nrho ntawm qhov project vim nws tshem tawm qhov xav tau kev hloov kho tsis tu ncua. Ntxiv rau, nws tuaj yeem siv tau sai thiab yooj yim dua, nce kev tsim kho ceev.
nce zog
Lwm qhov txiaj ntsig tseem ceeb ntawm kev siv HPMC hauv cov cement mortar yog nws ua kom lub zog ntawm cov tshuaj khib. HPMC pab txhawm rau txhawm rau cov cement sib npaug, ua rau muaj zog dua, txhim khu kev qha rau cov substrate. Kev txhim kho dej tuav cov khoom ntawm HPMC pab hauv kev kho cov cement mortar, yog li ua kom nws lub zog. Cov dej hauv mortar muab dej rau cov cement thiab muaj HPMC pab khaws cov dej, yog li txhim kho cov txheej txheem kho.
txo shrinkage
Shrinkage yog ib qho teeb meem tshwm sim hauv cov cement mortar vim evaporation ntawm dej. Shrinkage tuaj yeem ua rau tawg, uas tuaj yeem cuam tshuam rau lub zog thiab durability ntawm cov qauv. Txawm li cas los xij, HPMC pab txo qis cov cement mortar shrinkage los ntawm kev khaws cov dej noo thiab qeeb evaporation. Qhov no txo qhov kev pheej hmoo ntawm kev tawg, ua rau muaj zog, ruaj khov dua.
txhim kho adhesion
Thaum kawg, HPMC pab txhim kho lub zog ntawm cov cement mortar. HPMC ua raws li ib tug binder uas pab tuav lub mortar ua ke. Nws kuj pab tsim kom muaj kev sib raug zoo ntawm cov tshuaj khib thiab cov substrate. Lub peev xwm sib txuas ntawm cov cement mortar yog txhim kho, thiab cov qauv muaj zog thiab ruaj khov dua, uas tuaj yeem tiv taus sab nraud.
nyob rau hauv xaus
Nyob rau hauv xaus, HPMC yog ib qho tseem ceeb additive nyob rau hauv cement mortar vim nws cov dej tuav, ua hauj lwm, lub zog, txo shrinkage thiab txhim kho cohesion. Lub mechanism ntawm kev txiav txim ntawm cellulose ethers nyob rau hauv cement mortar yog raws li kev txhim kho dej tuav, pab nyob rau hauv lub curing txheej txheem, muab uniform dispersion ntawm cov cement, txhim kho kev ua hauj lwm, txo shrinkage thiab txhim kho kev sib raug zoo. Kev siv HPMC zoo hauv cov cement mortars tuaj yeem ua rau muaj zog, ruaj khov thiab txhim khu kev qha, uas yog qhov tseem ceeb rau txhua qhov kev tsim kho. Nrog rau kev siv HPMC kom raug, cov phiaj xwm kev tsim kho tuaj yeem ua tiav sai dua, ua tau zoo dua thiab zoo dua.
Post lub sij hawm: Lub Xya hli ntuj-27-2023