Hydroxypropyl Methylcellulose (HPMC)yog ib qho tseem ceeb cellulose ether compound siv dav hauv cov ntaub ntawv tsim kho, tshwj xeeb tshaj yog hauv cov cement-based mortars, gypsum-based cov ntaub ntawv thiab coatings. HPMC ua lub luag haujlwm tseem ceeb hauv kev txhim kho cov khoom ntawm mortar, suav nrog kev txhim kho nws cov khoom tiv thaiv dej.
1. Txhim kho qhov kev khaws cia dej ntawm cov mortar
Ib qho ntawm cov yam ntxwv tseem ceeb tshaj plaws ntawm HPMC yog nws lub peev xwm khaws dej zoo heev. Ntxiv HPMC rau hauv mortar tuaj yeem txo qhov kev poob dej hauv mortar. Qhov kev ua tau zoo tshwj xeeb yog:
Ntev lub sijhawm ua kom cov cement hydration teb: HPMC tuaj yeem tswj cov av noo kom zoo hauv cov mortar thiab xyuas kom meej tias cov cement me me ua rau cov dej sib xyaw ua ke los ua cov khoom hydration denser.
Tiv thaiv kom tsis txhob muaj kab nrib pleb: Kev poob dej sai sai tuaj yeem ua rau cov mortar ntsws thiab pib muaj kab nrib pleb me me, yog li txo cov yam ntxwv tiv thaiv dej.HPMCtuaj yeem ua rau qeeb qeeb ntawm kev poob dej thiab txo cov kab nrib pleb los ntawm kev ntsws qhuav.
Qhov kev txhim kho ntawm kev ua tau zoo ntawm kev khaws dej ua rau cov qauv sab hauv ntawm cov mortar ntom dua, txo qhov porosity, thiab txhim kho qhov impermeability ntawm cov mortar, yog li txhim kho nws cov kev ua tau zoo ntawm kev tiv thaiv dej.
2. Txhim kho qhov ua haujlwm tau ntawm cov mortar
Cov yam ntxwv viscosity ntawm HPMC txhim kho cov khoom rheological ntawm cov mortar, yog li txhim kho nws cov haujlwm ua haujlwm:
Txo kev los ntshav: HPMC tuaj yeem faib cov dej kom sib npaug, ua rau cov dej faib tau ruaj khov dua hauv cov tshuaj khib thiab txo cov qhov hws uas tshwm sim los ntawm kev sib cais dej.
Txhim kho qhov kev nplaum ntawm cov tshuaj khib: HPMC txhim kho lub zog sib txuas ntawm cov tshuaj khib thiab cov khoom siv hauv paus, tso cai rau cov tshuaj khib kom npog qhov chaw ntawm cov khoom siv hauv paus ze dua, yog li txo qhov ua tau ntawm cov dej noo nkag mus los ntawm qhov sib txawv ntawm cov khoom siv hauv paus thiab cov tshuaj khib.
Kev txhim kho qhov zoo ntawm kev tsim kho ncaj qha cuam tshuam rau qhov cuam tshuam ntawm cov mortar tiv thaiv dej. Ib txheej mortar npog sib npaug thiab tuab tuaj yeem tiv thaiv tau cov dej noo nkag.
3. Tsim ib daim zaj duab xis tiv thaiv saum npoo av
HPMC muaj cov khoom ua zaj duab xis thiab tuaj yeem tsim cov zaj duab xis tiv thaiv nyias thiab ntom ntom rau ntawm qhov chaw ntawm cov mortar:
Txo qhov dej ntws sai: Tom qab kev tsim kho tiav lawm, HPMC yuav tsim ib daim zaj duab xis tiv thaiv rau ntawm qhov chaw ntawm cov mortar kom txo qhov nqus dej noo hauv cov mortar los ntawm ib puag ncig sab nraud.
Thaiv kev nkag mus rau hauv cov dej noo: Cov txheej HPMC tom qab tsim zaj duab xis muaj qee qib ntawm kev tiv thaiv dej thiab tuaj yeem siv ua qhov thaiv kom tiv thaiv cov dej noo sab nraud kom tsis txhob nkag mus rau hauv cov mortar.
Qhov kev tiv thaiv saum npoo no muab kev tiv thaiv ntxiv rau cov khoom tiv thaiv dej ntawm cov mortar.
4. Txo qhov porosity ntawm mortar
HPMC tuaj yeem txhim kho qhov microstructure ntawm mortar. Nws cov txheej txheem ua haujlwm yog raws li nram no:
Cov nyhuv sau: HPMC molecules tuaj yeem nkag mus rau hauv cov qauv microporous hauv cov mortar thiab ib feem sau cov pores, yog li txo cov dej noo.
Txhim kho qhov compactness ntawm cov khoom hydration: Los ntawm kev khaws dej, HPMC txhim kho qhov sib xws thiab compactness ntawm cov khoom cement hydration thiab txo cov naj npawb ntawm cov qhov loj hauv cov mortar.
Qhov txo qis ntawm cov porosity ntawm cov mortar tsis yog tsuas yog txhim kho qhov kev ua tau zoo ntawm kev tiv thaiv dej xwb, tab sis kuj txhim kho qhov ruaj khov ntawm cov mortar.
5. Txhim kho kev tiv thaiv te thiab kev ua haujlwm ntev
Qhov dej nkag mus yuav ua rau cov mortar puas tsuaj vim yog te nyob rau hauv qhov chaw kub qis. Cov nyhuv tiv thaiv dej ntawm HPMC tuaj yeem txo qhov dej nkag mus thiab txo qhov kev puas tsuaj rau mortar los ntawm cov voj voog khov-thaw:
Tiv thaiv kom tsis txhob muaj dej noo: Txo qhov khaws dej noo hauv cov mortar thiab txo qhov cuam tshuam ntawm te.
Lub neej ntev ntawm cov mortar: Los ntawm kev txo cov dej tawm tsam thiab kev puas tsuaj ntawm cov khoom siv khov-thaw, HPMC ua rau cov mortar ruaj khov ntev dua.
HPMC txhim kho kev ua haujlwm tsis muaj dej ntawm cov mortar los ntawm cov hauv qab no: txhim kho kev khaws cia dej, ua kom zoo dua kev ua haujlwm, tsim cov zaj duab xis tiv thaiv, txo qhov porosity thiab txhim kho kev tiv thaiv te. Cov txiaj ntsig synergistic ntawm cov khoom no ua rau cov mortar ua kom pom cov txiaj ntsig zoo dua rau kev tiv thaiv dej hauv kev siv tiag tiag. Txawm hais tias nyob rau hauv cov mortars tiv thaiv dej, cov mortars tus kheej lossis cov nplaum pobzeb, HPMC ua lub luag haujlwm tseem ceeb.
Hauv kev siv ua haujlwm, qhov ntau ntawm HPMC ntxiv yuav tsum tau ua kom zoo raws li qhov xav tau tshwj xeeb kom ntseeg tau tias nws tsis tsuas yog ua rau muaj kev tiv thaiv dej zoo xwb, tab sis kuj tseem tswj tau qhov sib npaug ntawm lwm cov ntsuas kev ua tau zoo ntawm cov mortar. Los ntawm kev siv HPMC kom raug, kev ua haujlwm tiv thaiv dej ntawm cov ntaub ntawv hauv tsev tuaj yeem txhim kho tau zoo heev thiab kev tiv thaiv txhim khu kev qha dua tuaj yeem muab rau cov haujlwm tsim kho.
Lub sijhawm tshaj tawm: Kaum Ib Hlis-23-2024