Cellulose ether feem ntau yog ib qho khoom tseem ceeb hauv cov mortars qhuav. Vim tias nws yog ib qho tseem ceeb uas khaws dej tau zoo heev. Qhov no tuaj yeem tiv thaiv cov dej hauv cov mortar ntub kom tsis txhob evaporate ua ntej lub sijhawm lossis raug nqus los ntawm cov substrate, ua kom lub sijhawm ua haujlwm ntawm cov mortar ntub ntev dua, xyuas kom cov cement tau hydrated tag nrho, thiab yog li ntawd thaum kawg xyuas kom meej cov khoom siv kho tshuab ntawm cov mortar, uas yog qhov tshwj xeeb tshaj yog rau kev tsim cov mortars nyias (xws li plastering mortars) thiab mortars hauv cov substrates nqus tau zoo (xws li aerated concrete blocks), kub siab thiab qhuav.
Qhov khoom siv khaws dej ntawm cellulose muaj feem cuam tshuam nrog nws cov viscosity. Qhov viscosity ntawm cellulose ether siab dua, qhov zoo dua qhov kev ua tau zoo ntawm kev khaws dej. Viscosity yog ib qho tseem ceeb ntawm MC kev ua tau zoo. Tam sim no, cov chaw tsim khoom MC sib txawv siv ntau txoj kev thiab cov cuab yeej los ntsuas qhov viscosity ntawm MC, thiab cov txheej txheem tseem ceeb yog Haake Rotovisko, Hoppler, Ubbelohde thiab Brookfield. Rau tib yam khoom, cov txiaj ntsig viscosity ntsuas los ntawm ntau txoj kev sib txawv heev, thiab qee qhov txawm tias txawv exponentially. Yog li ntawd, thaum piv viscosities, nws yog ib qho tseem ceeb kom ua li ntawd ntawm tib txoj kev xeem, suav nrog kub, rotor, thiab lwm yam.
Feem ntau hais lus, qhov siab dua qhov viscosity, qhov zoo dua qhov dej khaws cia nyhuv. Txawm li cas los xij, qhov siab dua qhov viscosity, qhov siab dua qhov molecular hnyav ntawm MC thiab qhov txo qis hauv nws cov solubility, uas muaj qhov tsis zoo rau lub zog thiab kev ua haujlwm ntawm cov mortar. Qhov siab dua qhov viscosity, qhov ntau dua qhov thickening effect ntawm cov mortar. Qhov siab dua qhov viscosity, qhov nplaum ntawm cov mortar ntub yuav, ob qho tib si hauv kev tsim kho, raws li pom los ntawm cov scraper nplaum thiab qhov lo rau lub substrate siab. Txawm li cas los xij, nws tsis pab ntau los ua kom lub zog ntawm cov mortar ntub nws tus kheej. Thaum ob qho tib si tsim kho, nws qhia tau hais tias qhov kev ua tau zoo tiv thaiv kev sagging tsis pom tseeb. Ntawm qhov tsis sib xws, qee qhov qis mus rau nruab nrab viscosity tab sis hloov kho methyl cellulose ethers muaj kev ua tau zoo heev hauv kev txhim kho lub zog ntawm cov mortar ntub.
Lub sijhawm tshaj tawm: Lub Peb Hlis-10-2022