Hauv kev tsim cov ntaub ntawv siv hauv tsev, tshwj xeeb tshaj yog cov hmoov qhuav mortar,cellulose etherUa lub luag haujlwm tseem ceeb, tshwj xeeb tshaj yog hauv kev tsim cov tshuaj mortar tshwj xeeb (hloov kho mortar), nws yog ib qho khoom tseem ceeb. Lub luag haujlwm tseem ceeb ntawm cov cellulose ether uas yaj tau hauv dej hauv cov tshuaj mortar feem ntau yog nws lub peev xwm khaws dej zoo heev. Cov nyhuv khaws dej ntawm cellulose ether nyob ntawm qhov nqus dej ntawm cov txheej hauv paus, cov khoom sib xyaw ntawm cov tshuaj mortar, qhov tuab ntawm cov txheej tshuaj mortar, qhov xav tau dej ntawm cov tshuaj mortar, thiab lub sijhawm teeb tsa ntawm cov khoom teeb tsa.
Ntau cov tshuaj txhuam masonry thiab plastering mortars tsis tuav dej zoo, thiab cov dej thiab slurry yuav sib cais tom qab ob peb feeb sawv. Kev khaws dej yog ib qho tseem ceeb ntawm methyl cellulose ether, thiab nws kuj yog ib qho kev ua tau zoo uas ntau lub tuam txhab tsim cov tshuaj txhuam qhuav hauv tsev, tshwj xeeb tshaj yog cov neeg nyob rau sab qab teb uas muaj qhov kub siab, them sai sai rau. Cov yam ntxwv uas cuam tshuam rau kev khaws dej ntawm cov tshuaj txhuam hmoov qhuav suav nrog qhov ntau ntawm kev ntxiv, viscosity, fineness ntawm cov khoom me me, thiab qhov kub ntawm qhov chaw siv.
Kev khaws cia dej ntawmcellulose ethernws tus kheej los ntawm qhov solubility thiab dehydration ntawm cellulose ether nws tus kheej. Raws li peb txhua tus paub, txawm hais tias cov saw hlau molecular cellulose muaj ntau tus neeg OH pawg uas muaj dej ntau, nws tsis yaj hauv dej, vim tias cov qauv cellulose muaj qib siab ntawm crystallinity. Lub peev xwm hydration ntawm hydroxyl pawg ib leeg tsis txaus los npog cov hydrogen bonds muaj zog thiab van der Waals rog ntawm cov molecules. Yog li ntawd, nws tsuas yog swells tab sis tsis yaj hauv dej. Thaum ib qho substituent raug qhia rau hauv cov saw hlau molecular, tsis yog tsuas yog cov substituent rhuav tshem cov saw hlau hydrogen, tab sis kuj tseem muaj cov interchain hydrogen bond raug rhuav tshem vim yog qhov wedging ntawm cov substituent ntawm cov saw hlau sib ze. Qhov loj dua cov substituent, qhov ntau dua qhov deb ntawm cov molecules. Qhov ntau dua qhov deb. Qhov ntau dua qhov cuam tshuam ntawm kev rhuav tshem cov hydrogen bonds, cov cellulose ether ua dej-soluble tom qab cellulose lattice nthuav dav thiab cov tshuaj nkag mus, tsim cov tshuaj viscosity siab. Thaum qhov kub nce siab, qhov hydration ntawm polymer tsis muaj zog, thiab cov dej ntawm cov saw hlau raug tsav tawm. Thaum cov nyhuv ntawm lub cev qhuav dej txaus, cov molecules pib sib sau ua ke, tsim cov qauv network peb-seem gel thiab tais tawm.
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 thiab qhov siab dua qhov hnyav molecular, qhov txo qis hauv nws cov solubility yuav muaj qhov cuam tshuam 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, tab sis nws tsis yog proportional ncaj qha. Qhov siab dua qhov viscosity, qhov ntau dua viscosity ntawm cov ntub mortar yuav, uas yog, thaum lub sijhawm tsim kho, nws yog manifested li lo rau ntawm scraper thiab siab adhesion rau lub substrate. Tab sis nws tsis pab kom nce lub zog ntawm cov ntub mortar nws tus kheej. Thaum lub sijhawm tsim kho, qhov kev ua tau zoo tiv thaiv-sag tsis pom tseeb. Ntawm qhov tsis sib xws, qee qhov nruab nrab thiab qis viscosity tab sis hloov kho methylcov cellulose ethersmuaj kev ua tau zoo heev hauv kev txhim kho lub zog ntawm cov mortar ntub.
Lub sijhawm tshaj tawm: Plaub Hlis-25-2024