Hauv mortar qhuav, cellulose ether yog ib qho tseem ceeb ntxiv uas tuaj yeem txhim kho kev ua haujlwm ntawm mortar ntub thiab cuam tshuam rau kev tsim kho ntawm mortar. Methyl cellulose ether plays lub luag haujlwm ntawm dej tuav, thickening, thiab txhim kho kev tsim kho kev ua haujlwm. Kev tuav dej zoo ua kom ntseeg tau tias cov mortar yuav tsis ua rau cov xuab zeb, hmoov av thiab lub zog txo vim dej tsis txaus thiab tsis tiav cov cement hydration; Cov nyhuv thickening Lub zog ntawm cov mortar ntub dej yog qhov zoo heev, thiab qhov sib ntxiv ntawm methyl cellulose ether tuaj yeem txhim kho cov viscosity ntub dej ntawm cov mortar, thiab muaj qhov zoo adhesion rau ntau yam substrates, yog li txhim kho kev ua haujlwm ntawm cov mortar ntub dej ntawm phab ntsa. thiab txo cov khoom pov tseg; Tsis tas li ntawd, sib txawv Lub luag hauj lwm ntawm cellulose nyob rau hauv cov khoom kuj txawv, piv txwv li: cellulose nyob rau hauv pobzeb adhesives yuav ua rau kom lub sij hawm qhib thiab kho lub sij hawm; cellulose nyob rau hauv mechanical spraying mortar tuaj yeem txhim kho lub zog ntawm cov mortar ntub dej; nyob rau hauv tus kheej-leveling, cellulose plays lub luag hauj lwm nyob rau hauv kev tiv thaiv kev sib haum xeeb, Segregation thiab stratification.
Kev tsim cov cellulose ether yog tsim los ntawm ntuj fibers los ntawm alkali dissolution, grafting cov tshuaj tiv thaiv (etherification), ntxuav, ziab, sib tsoo thiab lwm yam txheej txheem. Lub ntsiab raw cov ntaub ntawv ntawm ntuj fibers yuav muab faib ua: paj rwb fiber, cedar fiber, beech fiber, thiab lwm yam. Lawv degree ntawm polymerization yog txawv, uas yuav cuam tshuam rau qhov kawg viscosity ntawm lawv cov khoom. Tam sim no, cov tuam txhab loj cellulose siv paj rwb fiber ntau (ib yam khoom ntawm nitrocellulose) ua cov khoom siv tseem ceeb. Cellulose ethers tuaj yeem muab faib ua ionic thiab non-ionic. Hom ionic feem ntau suav nrog carboxymethyl cellulose ntsev, thiab hom non-ionic feem ntau suav nrog methyl cellulose, methyl hydroxyethyl (propyl) cellulose, thiab hydroxyethyl cellulose. Su thiab lwm yam. Nyob rau hauv qhuav hmoov mortar, vim ionic cellulose (carboxymethyl cellulose ntsev) yog tsis ruaj tsis khov nyob rau hauv lub xub ntiag ntawm calcium ions, nws yog tsis tshua muaj siv nyob rau hauv qhuav hmoov khoom xws li cov cement slaked txiv qaub li cov ntaub ntawv cementitious.
Cov dej tuav ntawm cellulose kuj muaj feem xyuam rau qhov kub thiab txias siv. Cov dej tuav ntawm methyl cellulose ether txo qis nrog qhov nce ntawm qhov kub thiab txias. Piv txwv li, nyob rau lub caij ntuj sov, thaum muaj tshav ntuj, sab nrauv phab ntsa putty yog plastered, uas feem ntau accelerates kho ntawm cement thiab mortar. Lub hardening thiab qhov txo qis ntawm cov dej tuav tus nqi ua rau pom tseeb tias ob qho tib si kev tsim kho thiab kev tiv thaiv kev ua haujlwm tau cuam tshuam. Hauv qhov no, nws yog ib qho tseem ceeb tshwj xeeb los txo qhov cuam tshuam ntawm qhov kub thiab txias. Qee zaum nws tsis tuaj yeem ua tau raws li qhov xav tau ntawm kev siv. Qee qhov kev kho mob tau ua tiav ntawm cov cellulose, xws li nce qib ntawm etherification, thiab lwm yam, kom cov dej tuav cov nyhuv tseem tuaj yeem tswj tau qhov zoo ntawm qhov kub thiab txias.
Kev tuav dej ntawm cellulose: Lub ntsiab tseem ceeb cuam tshuam rau cov dej khaws cia ntawm mortar suav nrog tus nqi ntawm cellulose ntxiv, viscosity ntawm cellulose, fineness ntawm cellulose, thiab qhov kub ntawm qhov chaw ua haujlwm.
Viscosity ntawm cellulose: Feem ntau hais lus, qhov siab dua qhov viscosity, qhov zoo dua cov dej tuav, tab sis qhov siab dua qhov viscosity, siab dua qhov hnyav molecular ntawm cellulose, thiab qhov sib piv hauv nws cov solubility, uas muaj kev cuam tshuam tsis zoo rau kev tsim kho. thiab lub zog ntawm mortar. Qhov siab dua qhov viscosity, qhov pom tseeb dua cov nyhuv thickening ntawm mortar, tab sis nws tsis ncaj qha proportional. Qhov siab dua qhov viscosity, qhov viscous ntau dua cov mortar ntub yuav. Thaum lub sij hawm tsim kho, nws yuav lo rau lub scraper thiab muaj siab adhesion rau lub substrate, tab sis nws yuav tsis pab ntau npaum li cas los mus nce lub structural zog ntawm lub ntub mortar nws tus kheej, thiab anti-sag kev kawm yuav tsis pom tseeb thaum lub sij hawm tsim kho.
Lub fineness ntawm cellulose: Lub fineness cuam tshuam rau solubility ntawm cellulose ether. Coarse cellulose feem ntau yog granular thiab yooj yim dispersed nyob rau hauv dej yam tsis muaj agglomeration, tab sis lub dissolution tus nqi qeeb heev. Nws tsis haum rau siv hauv cov hmoov qhuav mortar. Hauv tsev tsim Ib txhia ntawm cov cellulose yog flocculent, nws tsis yooj yim rau disperse thiab yaj nyob rau hauv dej, thiab nws yog ib qho yooj yim rau agglomerate. Tsuas yog cov hmoov zoo txaus tuaj yeem zam methyl cellulose ether agglomeration thaum ntxiv dej thiab nplawm. Tab sis cov thicker cellulose ether tsis yog tsuas yog khib nyiab xwb tab sis kuj txo lub zog hauv zos ntawm mortar. Thaum xws li cov hmoov qhuav mortar yog tsim nyob rau hauv ib cheeb tsam loj, kev kho ceev ntawm lub mortar hauv zos yog pom tseeb txo, thiab cov kab nrib pleb vim lub sij hawm sib txawv. Vim lub sij hawm sib tov luv luv, mortar nrog kev tsim kho tshuab yuav tsum tau ua kom zoo dua qub.
Post lub sij hawm: Feb-13-2023