HPMC (hydroxypropyl methylcellulose) yog ib hom cellulose etherate uas tsis yog ionic uas siv dav hauv cov ntaub ntawv siv hauv kev tsim kho, tshwj xeeb tshaj yog cov ntaub ntawv siv cement, vim nws cov yam ntxwv tshwj xeeb ntawm lub cev thiab tshuaj. Lub luag haujlwm ntawm HPMC hauv cement feem ntau yog los txhim kho kev ua haujlwm ntawm kev tsim kho, txhim kho lub zog sib txuas, txhim kho kev khaws dej, thiab ncua sijhawm teeb tsa.
1. Txhim kho kev ua haujlwm ntawm kev tsim kho
HPMC tuaj yeem txhim kho kev ua tau zoo ntawm cov cement mortar. HPMC muaj cov nyhuv thickening zoo heev, uas tuaj yeem ua rau cov mortar muaj qhov sib xws nruab nrab thiab pab txhawb kev ua haujlwm tsim kho. Nws cov nyhuv thickening pab txhim kho qhov kev tiv thaiv sag ntawm cov cement mortar, tshwj xeeb tshaj yog hauv kev tsim kho ntsug, xws li phab ntsa plastering thiab vuas, uas tuaj yeem tiv thaiv cov mortar los ntawm sagging, yog li ua kom ntseeg tau tias kev tsim kho zoo. Lubricity ntawm HPMC ua rau cov txheej txheem tsim kho du, txo qhov kev tiv thaiv thaum lub sijhawm tsim kho, thiab txhim kho kev ua haujlwm zoo.
2. Txhim kho lub zog sib txuas
Hauv cov ntaub ntawv ua los ntawm cement, lub zog sib txuas yog qhov qhia tau tseem ceeb. Los ntawm nws cov qauv molecular fibrous, HPMC tuaj yeem tsim cov qauv network ruaj khov hauv cov cement matrix, yog li txhim kho lub zog sib txuas ntawm cov mortar. Tshwj xeeb, HPMC tuaj yeem txhim kho qhov sib txuas ntawm cov mortar thiab cov khoom siv hauv paus, ua rau cov mortar lo rau cov ntaub ntawv hauv paus xws li phab ntsa thiab pem teb. Cov cuab yeej no yog qhov tseem ceeb tshwj xeeb hauv cov ntawv thov xws li cov nplaum pobzeb thiab cov khoom plaster uas xav tau lub zog sib txuas siab.
3. Txhim kho kev khaws dej
Qhov kev khaws dej ntawm HPMC yog lub luag haujlwm tseem ceeb ntawm nws daim ntawv thov hauv cov ntaub ntawv ua los ntawm cement. Cement xav tau dej tsim nyog rau cov tshuaj tiv thaiv hydration thaum lub sijhawm ua kom tawv, thiab HPMC tuaj yeem tiv thaiv kev poob dej ntau dhau los ntawm kev nqus dej thiab faib nws sib npaug hauv cov mortar, yog li ua kom muaj dej txaus ntawm cement. Qhov kev khaws dej no yog qhov tseem ceeb heev rau kev txhim kho lub zog ntawm mortar thiab txo qhov kev ntsws thiab tawg. Tshwj xeeb tshaj yog nyob rau hauv huab cua kub lossis qhuav, qhov cuam tshuam ntawm kev khaws dej ntawm HPMC tuaj yeem txhim kho qhov ruaj khov thiab zoo ntawm mortar.
4. Ncua lub sijhawm coagulation
HPMC tuaj yeem ncua lub sijhawm teeb tsa ntawm cov cement thiab muab sijhawm tsim kho ntev dua. Qhov no yog qhov tseem ceeb tshwj xeeb hauv cov xwm txheej kev tsim kho uas xav tau kev hloov kho thiab kev hloov kho mus sij hawm ntev. Los ntawm kev qeeb qeeb qhov ceev ntawm cov tshuaj tiv thaiv hydration ntawm cement, HPMC tso cai rau cov neeg ua haujlwm tsim kho lub sijhawm txaus los ua haujlwm thiab kho, yog li zam kev puas tsuaj ntawm kev tsim kho los ntawm kev ua kom sai dhau. Qhov no yog qhov zoo heev rau kev tsim kho thaj chaw loj lossis kev tsim kho cov qauv nyuaj.
5. Txhim kho qhov tawg tsis kam ntawm mortar
Kev siv HPMC kuj tseem tuaj yeem txhim kho qhov tsis kam ntawm cov mortar. Thaum lub sijhawm ua kom tawv ntawm cov cement mortar, cov kab nrib pleb shrinkage feem ntau tshwm sim vim yog evaporation thiab poob dej. Los ntawm kev txhim kho qhov khaws dej ntawm cov mortar, HPMC txo cov shrinkage qhuav los ntawm kev poob dej, yog li txo qhov tshwm sim ntawm cov kab nrib pleb. Cov nyhuv thickening thiab lubricating ntawm HPMC kuj pab txhim kho qhov yooj ywm ntawm cov mortar, ntxiv txo qhov tshwm sim ntawm cov kab nrib pleb.
6. Txhim kho kev tiv thaiv khov-thaw
Hauv thaj chaw txias, cov ntaub ntawv tsim kho feem ntau raug rau lub voj voog khov-thaw. Kev siv HPMC hauv cov mortar tuaj yeem txhim kho qhov kev tiv thaiv khov-thaw ntawm cov mortar. Nws cov dej khaws cia zoo thiab cov khoom tuab ua rau cov mortar tswj tau lub zog siab thaum lub sijhawm khov thiab yaj, zam kev puas tsuaj ntawm cov qauv los ntawm kev nthuav dav thiab kev cog lus ntawm dej hauv cov khoom.
7. Lwm yam kev siv
Ntxiv rau cov haujlwm tseem ceeb saum toj no, HPMC kuj tseem tuaj yeem kho qhov viscosity thiab fluidity ntawm cov cement mortar los tswj qhov pumpability thiab rheological cov khoom ntawm cov mortar kom hloov kho rau ntau yam kev xav tau ntawm kev tsim kho. Piv txwv li, hauv cov ntaub ntawv hauv pem teb uas tus kheej leveling, kev siv HPMC tuaj yeem txhim kho qhov fluidity ntawm cov khoom thiab xyuas kom meej tias lub hauv pem teb tiaj tus thiab sib xws. HPMC kuj tseem tuaj yeem txhim kho qhov ruaj khov ntawm cov mortar sib xyaw qhuav thiab tiv thaiv cov mortar los ntawm kev sib cais lossis kev sib sau ua ke thaum lub sijhawm khaws cia.
HPMC siv dav hauv cov ntaub ntawv ua los ntawm cement. Nws tsis tsuas yog txhim kho kev ua tau zoo ntawm cov mortar, ua kom lub zog sib txuas, thiab ncua sijhawm teeb tsa, tab sis kuj txhim kho qhov tuav dej thiab tawg ntawm mortar, yog li txhim kho qhov zoo thiab ruaj khov ntawm cov khoom cement. Raws li kev lag luam kev tsim kho qhov kev thov rau cov ntaub ntawv ua tau zoo txuas ntxiv mus, kev siv HPMC hauv cement yuav dav dua.
Lub sijhawm tshaj tawm: Lub Yim Hli-16-2024