HPMC (hydroxypropyl methylcellulose) yog ib qho tseem ceeb hauv tsev additive thiab yog dav siv nyob rau hauv tus kheej-leveling mortar. Self-leveling mortar yog ib yam khoom uas muaj fluidity siab thiab nws tus kheej-leveling muaj peev xwm, uas yog feem ntau siv nyob rau hauv pem teb kev tsim kho los tsim ib tug du thiab tiaj tus. Hauv daim ntawv thov no, lub luag haujlwm ntawm HPMC feem ntau cuam tshuam txog kev txhim kho cov dej ntws, dej tuav, adhesion thiab kev tsim kho ntawm cov mortar.
1. Cov yam ntxwv thiab cov txheej txheem ntawm kev ua ntawm HPMC
HPMC yog non-ionic cellulose ether nrog hydroxyl thiab methoxy pawg hauv nws cov qauv molecular, uas yog tsim los ntawm kev hloov qee cov hydrogen atoms hauv cellulose molecules. Nws cov khoom tseem ceeb muaj xws li dej solubility zoo, thickening, dej tuav, lubricity thiab muaj peev xwm sib txuas, uas ua rau nws siv dav hauv cov khoom siv hauv tsev.
Hauv tus kheej-leveling mortar, cov teebmeem tseem ceeb ntawm HPMC suav nrog:
Thickening nyhuv: HPMC ua kom cov viscosity ntawm tus kheej-leveling mortar los ntawm kev cuam tshuam nrog dej molecules los tsim cov tshuaj colloidal. Qhov no pab tiv thaiv kev sib cais ntawm cov mortar thaum tsim kho thiab ua kom cov khoom sib xws.
Kev tuav dej: HPMC muaj cov dej tuav tau zoo, uas tuaj yeem txo cov dej tsis zoo thaum lub sij hawm hardening txheej txheem ntawm mortar thiab ncua sij hawm ua haujlwm ntawm mortar. Qhov no yog ib qho tseem ceeb tshwj xeeb tshaj yog rau tus kheej-leveling mortar, vim tias cov dej poob sai heev tuaj yeem ua rau tawg los yog tsis sib haum ntawm cov tshuaj khib.
Flow regulation: HPMC kuj tseem tuaj yeem tswj cov dej ntws zoo thiab ua kom tus kheej muaj peev xwm los ntawm kev tswj cov rheology ntawm mortar. Qhov kev tswj no tuaj yeem tiv thaiv cov mortar los ntawm qhov siab dhau lossis qis dhau thaum lub sijhawm tsim kho, kom ntseeg tau tias kev ua haujlwm zoo ntawm cov txheej txheem tsim kho.
Txhim kho kev sib raug zoo: HPMC tuaj yeem ua kom lub zog sib txuas ntawm tus kheej-leveling mortar thiab lub hauv paus nto, txhim kho nws qhov kev ua tau zoo, thiab tsis txhob hollowing, tawg thiab lwm yam teeb meem tom qab kev tsim kho.
2. Daim ntawv thov tshwj xeeb ntawm HPMC nyob rau hauv tus kheej-leveling mortar
2.1 Txhim kho kev tsim kho kev ua haujlwm
Self-leveling mortar feem ntau xav tau lub sijhawm ua haujlwm ntev thaum lub sijhawm tsim kho kom paub meej txaus txaus thiab lub sijhawm leveling. Kev tuav dej ntawm HPMC tuaj yeem txuas ntxiv lub sijhawm pib ntawm mortar, yog li txhim kho qhov yooj yim ntawm kev tsim kho. Tshwj xeeb tshaj yog nyob rau hauv cheeb tsam loj hauv pem teb kev tsim kho, cov neeg ua haujlwm tsim kho tuaj yeem muaj sijhawm ntau los kho thiab qib.
2.2 Txhim kho kev ua haujlwm ntawm mortar
Cov nyhuv thickening ntawm HPMC tuaj yeem tsis tsuas yog tiv thaiv kev sib cais ntawm mortar, tab sis kuj ua kom muaj kev sib faib ntawm cov khoom sib xyaw thiab cov cement hauv cov tshuaj khib nyiab, yog li txhim kho tag nrho cov kev ua tau zoo ntawm mortar. Tsis tas li ntawd, HPMC kuj tseem tuaj yeem txo qhov tsim ntawm npuas ntawm qhov chaw ntawm tus kheej-leveling mortar thiab txhim kho qhov ua tiav ntawm cov mortar.
2.3 Txhim kho kev tawg tsis kam
Thaum lub sij hawm hardening txheej txheem ntawm nws tus kheej-leveling mortar, ceev ceev evaporation ntawm cov dej yuav ua rau nws ntim kom shrink, yog li ua rau tawg. HPMC tuaj yeem ua kom qeeb qeeb kom qhuav ceev ntawm mortar thiab txo qhov tshwm sim ntawm shrinkage tawg los ntawm kev khaws cov dej noo. Nyob rau tib lub sijhawm, nws yooj yim thiab adhesion kuj pab txhim kho qhov tawg tsis kam ntawm mortar.
3. Cov nyhuv ntawm HPMC ntau npaum li cas rau kev ua haujlwm ntawm mortar
Nyob rau hauv tus kheej-leveling mortar, tus nqi ntawm HPMC ntxiv yuav tsum tau tswj nruj me ntsis. Feem ntau, tus nqi ntawm HPMC ntxiv yog nyob nruab nrab ntawm 0.1% thiab 0.5%. Tus nqi tsim nyog ntawm HPMC tuaj yeem txhim kho cov dej ntws thiab dej tuav ntawm cov tshuaj khib nyiab, tab sis yog tias qhov ntau npaum li cas, nws yuav ua rau muaj teeb meem hauv qab no:
Tsis tshua muaj fluidity: HPMC ntau dhau yuav txo qhov fluidity ntawm mortar, cuam tshuam rau kev tsim kho, thiab tseem ua rau tsis muaj peev xwm ntawm tus kheej.
Kev ncua sij hawm teem sijhawm: Ntau dhau HPMC yuav txuas ntxiv lub sijhawm teeb tsa ntawm mortar thiab cuam tshuam rau kev tsim kho tom ntej.
Yog li ntawd, hauv kev siv tswv yim, nws yog ib qho tsim nyog yuav tsum tau kho qhov ntau npaum li cas ntawm HPMC raws li cov qauv ntawm tus kheej-leveling mortar, ambient kub thiab lwm yam los xyuas kom meej qhov kev tsim kho zoo tshaj plaws.
4. Kev cuam tshuam ntawm HPMC ntau yam ntawm kev ua yeeb yam mortar
HPMC muaj ntau yam kev qhia tshwj xeeb. Ntau yam ntawm HPMC tuaj yeem muaj qhov sib txawv ntawm qhov kev ua tau zoo ntawm tus kheej-leveling mortar vim lawv qhov sib txawv molecular hnyav thiab hloov qib. Feem ntau hais lus, HPMC nrog qib siab hloov pauv thiab qhov hnyav molecular siab muaj zog thickening thiab dej tuav cov teebmeem, tab sis nws qhov kev sib cais qeeb. HPMC nrog qib qis hloov pauv thiab qhov hnyav molecular tsawg dissolves sai dua thiab tsim nyog rau lub sijhawm uas yuav tsum tau tawg sai sai thiab luv luv coagulation. Yog li ntawd, thaum xaiv HPMC, nws yog ib qho tsim nyog yuav tau xaiv ntau yam tsim nyog raws li kev tsim kho tshwj xeeb.
5. Kev cuam tshuam ntawm ib puag ncig ntawm kev ua haujlwm ntawm HPMC
Cov dej tuav thiab cov nyhuv thickening ntawm HPMC yuav raug cuam tshuam los ntawm ib puag ncig kev tsim kho. Piv txwv li, nyob rau hauv qhov kub thiab av noo ib puag ncig, dej evaporates sai heev, thiab cov dej tuav cov nyhuv ntawm HPMC ua ib qho tseem ceeb tshwj xeeb; Nyob rau hauv ib qho chaw ntub dej, tus nqi ntawm HPMC yuav tsum tau txo kom tsim nyog kom tsis txhob muaj cov tshuaj khib nyiab qeeb heev. Yog li ntawd, nyob rau hauv cov txheej txheem tsim kho tiag tiag, tus nqi thiab hom HPMC yuav tsum tau hloov kho raws li ib puag ncig ib puag ncig kom ntseeg tau tias kev ruaj ntseg ntawm tus kheej-leveling mortar.
Raws li ib qho tseem ceeb additive nyob rau hauv tus kheej-leveling mortar, HPMC ho txhim kho kev tsim kho kev ua tau zoo thiab cov nyhuv kawg ntawm lub mortar los ntawm nws thickening, dej tuav, fluidity hloov thiab adhesion li. Txawm li cas los xij, hauv kev siv tiag tiag, yam xws li tus nqi, ntau yam thiab ib puag ncig kev tsim kho ntawm HPMC yuav tsum tau txiav txim siab kom tau txais cov txiaj ntsig zoo tshaj plaws. Nrog rau kev nce qib ntawm kev siv thev naus laus zis tas li, daim ntawv thov ntawm HPMC hauv tus kheej-leveling mortar yuav dhau los ua ntau dua thiab paub tab.
Post lub sij hawm: Sep-24-2024