HPMC (Hydroxypropyl Methylcellulose)yog ib yam khoom siv polymer uas siv ntau hauv kev lag luam kev tsim kho. Nws siv dav hauv cov cement-based mortar, dry-mixed mortar, adhesives thiab lwm yam khoom kom tuab, khaws dej, txhim kho. Nws muaj ntau yam haujlwm xws li kev nplaum thiab kev txhim kho kev ua haujlwm ntawm kev tsim kho. Nws lub luag haujlwm hauv mortar yog qhov tseem ceeb, tshwj xeeb tshaj yog hauv kev txhim kho qhov tawg ntawm mortar.
1. Kev khaws cia dej zoo dua
HPMC muaj cov dej khaws cia zoo, uas txhais tau tias dej yuav tsis ua pa sai sai thaum lub sijhawm tsim cov mortar, yog li tiv thaiv cov kab nrib pleb uas tshwm sim los ntawm kev poob dej ntau dhau. Tshwj xeeb tshaj yog nyob rau hauv qhov chaw qhuav thiab kub siab, cov nyhuv khaws cia dej ntawm HPMC yog qhov tshwj xeeb tshaj yog. Cov dej noo hauv cov mortar tuaj yeem nyob ruaj khov rau ib lub sijhawm kom tsis txhob qhuav ua ntej, uas yog qhov tseem ceeb heev rau kev txhim kho qhov tsis kam ntawm cov mortar. Kev khaws cia dej tuaj yeem ncua cov txheej txheem hydration ntawm cement, tso cai rau cov cement kom ua rau cov dej sib xyaw nrog dej ntev dua, yog li ua kom cov mortar tsis kam tawg.
2. Txhim kho qhov adhesion ntawm mortar
Ua ib qho thickener, HPMC tuaj yeem tsim cov qauv molecular zoo hauv cov mortar kom txhim kho qhov adhesion thiab fluidity ntawm cov mortar. Qhov no tsis yog tsuas yog txhim kho lub zog sib txuas ntawm cov mortar thiab txheej hauv paus thiab txo qhov tawg ntawm cov txheej interface, tab sis kuj txhim kho qhov toughness ntawm cov mortar thiab txo qhov tshwm sim ntawm cov kab nrib pleb los ntawm cov zog sab nraud thaum lub sijhawm tsim kho. Kev nplaum zoo ua rau cov mortar sib xws ntau dua thaum lub sijhawm tsim kho thiab txo cov kab nrib pleb los ntawm qhov tuab tsis sib xws ntawm cov pob qij txha.
3. Txhim kho qhov plasticity thiab workability ntawm mortar
HPMC txhim kho qhov plasticity thiab kev ua haujlwm ntawm cov mortar, uas tuaj yeem txhim kho qhov yooj yim ntawm kev tsim kho. Vim nws cov nyhuv thickening, HPMC tuaj yeem ua rau cov mortar muaj kev sib txuas zoo dua thiab kev ua tau zoo, txo qhov tshwm sim ntawm cov kab nrib pleb los ntawm cov mortar tsis sib npaug thiab cov dej tsis zoo thaum lub sijhawm tsim kho. Qhov zoo plasticity ua rau cov mortar sib npaug ntau dua thaum lub sijhawm ziab thiab shrinkage, txo qhov ua tau ntawm cov kab nrib pleb vim kev ntxhov siab tsis sib npaug.
4. Txo cov kab nrib pleb me me
Kev ntsws qhuav yog qhov ntim ntsws uas tshwm sim los ntawm dej evaporation thaum lub sijhawm ziab ntawm cov mortar. Kev ntsws qhuav ntau dhau yuav ua rau muaj kab nrib pleb ntawm qhov chaw lossis sab hauv ntawm cov mortar. HPMC ua rau qeeb qeeb ntawm kev nqus dej sai thiab txo qhov tshwm sim ntawm kev ntsws qhuav los ntawm nws cov dej khaws cia siab thiab cov teebmeem txhim kho plasticity. Kev tshawb fawb qhia tau hais tias cov mortar ntxiv nrog HPMC muaj qhov nrawm qis dua thiab nws qhov ntim hloov pauv tsawg dua thaum lub sijhawm ziab, yog li tiv thaiv cov kab nrib pleb uas tshwm sim los ntawm kev ntsws qhuav. Rau cov phab ntsa lossis pem teb loj, tshwj xeeb tshaj yog nyob rau lub caij ntuj sov kub lossis qhov chaw muaj cua thiab qhuav, lub luag haujlwm ntawm HPMC yog qhov tseem ceeb heev.
5. Txhim kho qhov tawg tsis kam ntawm mortar
Cov qauv molecular ntawm HPMC tuaj yeem tsim qee yam kev sib cuam tshuam tshuaj nrog cov cement thiab lwm yam khoom siv inorganic hauv cov mortar, ua rau cov mortar muaj kev tiv thaiv kab nrib pleb ntau dua tom qab ua kom tawv. Qhov kev txhim kho no tsis yog los ntawm kev sib xyaw nrog HPMC thaum lub sijhawm ua cov cement hydration, tab sis kuj txhim kho qhov tawv ntawm cov mortar mus rau qee qhov. Qhov tawv ntawm cov mortar tom qab ua kom tawv yog txhim kho, uas pab nws tiv taus kev ntxhov siab sab nraud loj thiab tsis yooj yim tawg. Tshwj xeeb tshaj yog nyob rau hauv ib puag ncig nrog qhov sib txawv ntawm qhov kub thiab txias lossis kev hloov pauv loj ntawm cov khoom sab nraud, HPMC tuaj yeem txhim kho qhov tsis kam ntawm cov mortar.
6. Ua kom cov mortar tsis nkag tau zoo
Ua ib yam khoom siv polymer organic, HPMC tuaj yeem tsim cov qauv me me hauv lub mortar kom txhim kho qhov compactness ntawm lub mortar. Cov yam ntxwv no ua rau lub mortar tsis nkag tau zoo thiab txo qhov permeability ntawm cov dej noo thiab lwm yam xov xwm sab nraud. Hauv qhov chaw noo noo lossis dej ntub, cov kab nrib pleb ntawm qhov chaw thiab sab hauv ntawm lub mortar yuav raug dej noo nkag mus, ua rau kev nthuav dav ntawm cov kab nrib pleb. Kev ntxiv ntawm HPMC tuaj yeem txo qhov nkag mus ntawm dej thiab tiv thaiv kev nthuav dav ntawm cov kab nrib pleb los ntawm dej nkag mus, yog li txhim kho qhov tsis kam ntawm lub mortar mus rau qee qhov.
7. Tiv thaiv kom tsis txhob muaj kab nrib pleb thiab nthuav dav
Thaum lub sijhawm ziab thiab ua kom tawv ntawm cov mortar, cov kab nrib pleb me me feem ntau tshwm sim sab hauv, thiab cov kab nrib pleb me me no yuav maj mam nthuav dav thiab tsim cov kab nrib pleb pom tseeb nyob rau hauv qhov kev ua ntawm cov zog sab nraud. HPMC tuaj yeem tsim cov qauv sib xws hauv cov mortar los ntawm nws cov qauv molecular, txo qhov muaj feem yuav muaj cov kab nrib pleb me me. Txawm tias muaj cov kab nrib pleb me me, HPMC tuaj yeem ua lub luag haujlwm tiv thaiv kab nrib pleb thiab tiv thaiv lawv kom tsis txhob nthuav dav ntxiv. Qhov no yog vim tias cov saw hlau polymer ntawm HPMC tuaj yeem ua rau muaj kev ntxhov siab ntawm ob sab ntawm cov kab nrib pleb los ntawm kev sib cuam tshuam ntawm cov molecular hauv cov mortar, yog li ntawd txwv tsis pub nthuav dav ntawm cov kab nrib pleb.
8. Txhim kho qhov elastic modulus ntawm mortar
Elastic modulus yog ib qho cim qhia tseem ceeb ntawm lub peev xwm ntawm cov khoom siv los tiv taus kev hloov pauv. Rau cov mortar, cov modulus elastic siab tuaj yeem ua rau nws ruaj khov dua thaum raug rau sab nraud thiab tsis tshua muaj kev hloov pauv ntau dhau lossis tawg. Ua ib qho plasticizer, HPMC tuaj yeem ua rau nws cov modulus elastic hauv mortar, uas ua rau cov mortar zoo dua tswj nws cov duab nyob rau hauv qhov kev ua ntawm sab nraud, yog li txo qhov tshwm sim ntawm kev tawg.
HPMCzoo txhim kho qhov tsis kam ntawm cov mortar hauv ntau yam los ntawm kev txhim kho qhov tuav dej, kev nplaum, plasticity thiab kev ua haujlwm ntawm mortar, txo qhov tshwm sim ntawm cov kab nrib pleb qhuav, thiab txhim kho qhov tsis kam ntawm cov kab nrib pleb, impermeability thiab elastic modulus. kev ua tau zoo. Yog li ntawd, daim ntawv thov ntawm HPMC hauv kev tsim kho mortar tsis tsuas yog txhim kho qhov tsis kam ntawm cov mortar, tab sis kuj txhim kho kev ua haujlwm ntawm kev tsim kho thiab txuas ntxiv lub neej kev pabcuam ntawm cov mortar.
Lub sijhawm tshaj tawm: Lub Kaum Ob Hlis-16-2024