Hydroxypropyl methylcellulose ether (HPMC) tau dhau los ua ib qho tseem ceeb ntxiv rau cov cement-based mortar vim nws cov khoom zoo thiab qhov zoo. HPMC yog hloov kho cellulose ether tau los ntawm kev kho cellulose nrog propylene oxide thiab methyl chloride. Nws yog cov hmoov dawb los yog dawb dawb uas yaj hauv dej los tsim cov kua dej ntshiab.
Qhov sib ntxiv ntawm HPMC rau cement-based mortars muaj qhov zoo ntawm kev txhim kho kev ua haujlwm, tuav dej, teeb tsa lub sijhawm thiab muaj zog ntxiv. Nws kuj tseem txhim kho mortar adhesion rau lub substrate thiab txo cov kab nrib pleb. HPMC yog ib puag ncig tus phooj ywg, nyab xeeb siv thiab tsis muaj tshuaj lom.
Txhim kho kev ua haujlwm
Lub xub ntiag ntawm HPMC nyob rau hauv cov cement-based mortars nce qhov sib xws ntawm qhov sib tov, ua kom yooj yim rau kev tsim thiab sib kis. Lub peev xwm khaws dej siab ntawm HPMC ua rau lub mortar nyob twj ywm ua haujlwm tau ntev. Qhov no yog qhov tseem ceeb tshwj xeeb tshaj yog nyob rau hauv huab cua kub thiab qhuav qhov chaw uas cov txheej txheem tsim kho yuav nyuaj.
Kev tuav dej
HPMC pab khaws cov dej noo hauv qhov sib tov rau lub sijhawm ntev dua. Qhov no yog qhov tseem ceeb vim tias dej yog ib qho tseem ceeb hauv kev ua kom cov cement thiab ua kom nws lub zog thiab kav ntev. Qhov muaj peev xwm tuav tau dej ntau ntxiv yog qhov muaj txiaj ntsig tshwj xeeb hauv thaj chaw uas muaj cov av qis lossis qhov kub siab, qhov twg cov dej hauv cov mortar tuaj yeem evaporate sai.
teem sijhawm
HPMC kho lub sijhawm teeb tsa ntawm cov cement-based mortar los ntawm kev tswj cov dej ntawm cov cement. Qhov no ua rau cov sijhawm ua haujlwm ntev dua, muab sijhawm rau cov neeg ua haujlwm txaus los thov thiab kho cov mortar ua ntej nws teeb tsa. Nws kuj tseem ua kom muaj kev ua tau zoo sib xws thoob plaws ib puag ncig sib txawv.
Kev siv zog ntau ntxiv
Qhov sib ntxiv ntawm HPMC txhawb kev tsim cov txheej txheem hydrate zoo, yog li txhim kho cov kav ntev thiab lub zog ntawm cov cement-based mortar. Qhov no yog vim qhov nce thickness ntawm txheej tsim nyob ib ncig ntawm cov cement clinker hais. Cov qauv tsim nyob rau hauv cov txheej txheem no yog qhov ruaj khov dua, yog li txhim kho lub peev xwm ntawm cov khoom khib nyiab.
Txhim kho adhesion
Lub xub ntiag ntawm HPMC nyob rau hauv cov cement-raws li mortars txhim kho qhov adhesion ntawm mortar thiab substrate. Qhov no yog vim HPMC lub peev xwm sib txuas nrog cov cement thiab substrate los ua ib daim ntawv cog lus ruaj khov. Yog li ntawd, lub caij nyoog ntawm cov mortar cracking los yog sib cais los ntawm lub substrate yog ho txo.
Txo kev tawg
Kev siv HPMC hauv cov cement-based mortars ua kom yooj yim dua thiab txo qhov yuav ua rau tawg. Qhov no yog vim muaj cov txheej txheem zoo hydrate uas tso cai rau cov tshuaj khib kom tiv thaiv kev tawg los ntawm kev nqus kev ntxhov siab thiab nthuav tawm lossis cog lus raws li. HPMC kuj txo qis shrinkage, lwm qhov ua rau tawg ntawm cov cement-based mortars.
HPMC yog ib puag ncig tus phooj ywg thiab tsis muaj tshuaj lom ntxiv uas ua lub luag haujlwm tseem ceeb hauv kev txhim kho kev ua haujlwm ntawm cov cement-based mortars. Nws cov txiaj ntsig deb tshaj nws cov nqi, thiab nws txoj kev siv tau nce nrov hauv kev tsim kho kev lag luam. Nws muaj peev xwm txhim kho kev ua haujlwm, dej tuav, teeb tsa lub sijhawm, nce lub zog, txhim kho adhesion thiab txo qhov tawg ua rau nws yog ib feem tseem ceeb ntawm kev tsim kho niaj hnub.
Post lub sij hawm: Sep-20-2023