HPMC (hydroxypropyl methylcellulose) yog nonnionic cellulose etherate uas tau siv dav hauv cov khoom siv hauv tsev, tshwj xeeb tshaj yog nyob rau hauv cov ntaub ntawv cement, vim nws lub cev thiab tshuaj lom neeg tshwj xeeb. Lub luag haujlwm ntawm HPMC hauv cov cement yog qhov tseem ceeb hauv kev txhim kho kev tsim kho, txhim kho kev sib raug zoo, txhim kho dej tuav, thiab ncua sijhawm teem sijhawm.
1. Txhim kho kev tsim kho kev ua haujlwm
HPMC tuaj yeem txhim kho kev tsim kho kev ua haujlwm ntawm cov cement mortar. HPMC muaj cov nyhuv thickening zoo heev, uas tuaj yeem ua rau cov mortar muaj qhov sib xws thiab ua kom yooj yim rau kev tsim kho. Nws cov nyhuv thickening pab txhim kho cov sag tsis kam ntawm cov cement mortar, tshwj xeeb tshaj yog nyob rau hauv kev tsim kho ntsug, xws li phab ntsa plastering thiab tiling, uas tuaj yeem tiv thaiv mortar los ntawm sagging, yog li ua kom muaj kev tsim kho zoo. Lubricity ntawm HPMC ua rau cov txheej txheem kev tsim kho smoother, txo cov kev tiv thaiv thaum lub sij hawm tsim kho, thiab txhim kho kev ua hauj lwm efficiency.
2. Txhim khu kev sib txuas
Hauv cov ntaub ntawv cement-based, daim ntawv cog lus lub zog yog qhov taw qhia tseem ceeb. Los ntawm nws cov qauv fibrous molecular, HPMC tuaj yeem tsim cov qauv sib txuas 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 adhesion ntawm mortar thiab cov khoom siv hauv paus, tso cai rau cov mortar ua kom ruaj khov rau cov ntaub ntawv xws li phab ntsa thiab cov plag tsev. Cov cuab yeej no tseem ceeb tshwj xeeb hauv cov ntawv thov xws li cov nplais nplaum thiab cov khoom siv plaster uas yuav tsum tau muaj zog heev.
3. Txhim kho dej tuav
Kev tuav dej ntawm HPMC yog lub luag haujlwm tseem ceeb ntawm nws daim ntawv thov hauv cov khoom siv cement. Cement xav tau cov dej tsim nyog rau cov tshuaj tiv thaiv dej thaum lub sij hawm hardening txheej txheem, thiab HPMC tuaj yeem tiv thaiv cov dej ntau dhau los ntawm kev nqus dej thiab sib npaug sib faib hauv cov tshuaj khib nyiab, yog li ua kom muaj dej txaus ntawm cov cement. Qhov kev tuav dej no yog qhov tseem ceeb heev rau kev txhim kho lub zog ntawm mortar thiab txo qis shrinkage thiab tawg. Tshwj xeeb tshaj yog nyob rau hauv cov huab cua kub los yog qhuav, cov dej tuav nyhuv ntawm HPMC tuaj yeem txhim kho cov kav ntev thiab zoo ntawm mortar.
4. ncua sij hawm coagulation
HPMC tuaj yeem ncua sijhawm teem sijhawm ntawm cov cement thiab muab sijhawm ntev dua kev tsim kho. Qhov no feature yog tshwj xeeb tshaj yog ib qho tseem ceeb nyob rau hauv kev tsim kho tej yam kev mob uas yuav tsum tau mus sij hawm ntev kev kho thiab kev hloov kho. Los ntawm kev ua kom cov dej ntws nrawm nrawm ntawm cov cement, HPMC tso cai rau cov neeg ua haujlwm tsim kho lub sijhawm txaus los ua haujlwm thiab hloov kho, yog li zam kev tsim kho tsis zoo los ntawm kev ua kom nrawm dhau. Cov yam ntxwv no muaj txiaj ntsig zoo heev rau kev tsim kho thaj tsam loj lossis kev tsim kho ntawm cov vaj tse complex.
5. Txhim kho qhov tawg tsis kam ntawm mortar
Kev siv HPMC kuj tuaj yeem txhim kho qhov tawg tsis kam ntawm cov tshuaj khib nyiab. Thaum lub sij hawm hardening txheej txheem ntawm cement mortar, shrinkage tawg feem ntau tshwm sim vim evaporation thiab poob dej. Los ntawm kev txhim kho cov dej khaws cia ntawm mortar, HPMC txo qis qis qis los ntawm cov dej poob, yog li txo qhov tshwm sim ntawm cov kab nrib pleb. Lub thickening thiab lubricating los ntawm HPMC kuj pab txhim kho qhov yooj ntawm cov mortar, ntxiv txo qhov tshwm sim ntawm cov kab nrib pleb.
6. Txhim kho khov-thaw tsis kam
Hauv cov cheeb tsam txias, cov khoom siv hauv tsev feem ntau raug rau lub voj voog khov-thaw. Daim ntawv thov ntawm HPMC hauv mortar tuaj yeem txhim kho qhov khov-thaw tsis kam ntawm mortar. Nws cov dej tuav tau zoo thiab cov khoom thickening tso cai rau lub mortar kom muaj zog thaum lub sij hawm khov thiab thawing txheej txheem, zam kev puas tsuaj los ntawm kev nthuav dav thiab kev cog lus ntawm cov dej hauv cov khoom.
7. Lwm yam kev siv
Ntxiv nrog rau cov haujlwm tseem ceeb saum toj no, HPMC kuj tuaj yeem kho cov viscosity thiab fluidity ntawm cov cement mortar los tswj cov twj tso kua mis thiab cov khoom siv rheological ntawm cov tshuaj khib kom hloov mus rau kev tsim kho sib txawv. Piv txwv li, nyob rau hauv tus kheej-leveling cov ntaub ntawv hauv pem teb, kev siv HPMC tuaj yeem txhim kho cov dej ntws ntawm cov ntaub ntawv thiab xyuas kom meej qhov flatness thiab uniformity ntawm hauv pem teb. HPMC tseem tuaj yeem txhim kho qhov ruaj khov ntawm cov khoom sib xyaw qhuav thiab tiv thaiv cov mortar los ntawm kev sib cais lossis daws thaum lub sijhawm khaws cia.
HPMC yog siv dav hauv cov khoom siv cement. Nws tuaj yeem tsis tsuas yog txhim kho kev tsim kho ntawm mortar, ua kom lub zog sib txuas, thiab ncua sij hawm teem sijhawm, tab sis kuj tseem txhim kho cov dej tuav thiab tawg tsis kam ntawm mortar, yog li txhim kho tag nrho cov khoom zoo thiab kav ntev ntawm cov khoom cement. Raws li kev tsim kho kev lag luam qhov kev thov rau cov ntaub ntawv ua tau zoo txuas ntxiv mus, daim ntawv thov kev cia siab ntawm HPMC hauv cov cement yuav dav dua.
Post lub sij hawm: Aug-16-2024