Cov teebmeem sib txawv ntawm cov cellulose sib txawv ntawm plaster of Paris yog dab tsi?
Ob qho tib si carboxymethyl cellulose thiab methyl cellulose siv tau ua cov neeg sawv cev khaws dej rau plaster, tab sis cov nyhuv khaws dej ntawm carboxymethyl cellulose qis dua li ntawm methyl cellulose, thiab carboxymethyl cellulose muaj sodium ntsev, yog li nws tsis haum rau plaster ntawm paris. Muaj cov nyhuv qeeb thiab txo qhov muaj zog ntawm plaster ntawm paris. Methyl cellulose yog cov khoom sib xyaw zoo tagnrho rau cov ntaub ntawv cementitious gypsum uas koom ua ke khaws dej, thickening, strengthening, thiab viscosifying, tsuas yog tias qee hom muaj cov nyhuv qeeb thaum cov koob tshuaj ntau dua li carboxymethyl cellulose. Vim li no, feem ntau cov ntaub ntawv gelling gypsum siv txoj kev sib xyaw ua ke.carboxymethyl cellulosethiabmethyl cellulose, uas tsis yog tsuas yog siv lawv cov yam ntxwv xwb (xws li cov nyhuv retarding ntawm carboxymethyl cellulose, cov nyhuv reinforcing ntawm methyl cellulose), thiab siv lawv cov txiaj ntsig zoo sib xws (xws li lawv cov dej khaws cia thiab cov nyhuv tuab). Ua li no, ob qho tib si kev ua tau zoo ntawm cov dej khaws cia ntawm cov khoom siv gypsum cementitious thiab kev ua tau zoo ntawm cov khoom siv gypsum cementitious tuaj yeem txhim kho, thaum tus nqi nce ntxiv khaws cia ntawm qhov qis tshaj plaws.
Qhov viscosity ntawm methyl cellulose ether tseem ceeb npaum li cas rau gypsum mortar?
Viscosity yog ib qho tseem ceeb ntawm kev ua tau zoo ntawm methyl cellulose ether.
Feem ntau hais lus, qhov siab dua qhov viscosity, qhov zoo dua qhov dej khaws cia ntawm gypsum mortar. Txawm li cas los xij, qhov siab dua qhov viscosity, qhov siab dua qhov hnyav molecular ntawm methyl cellulose ether, thiab 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 pom tseeb ntau dua qhov thickening effect ntawm cov mortar, tab sis nws tsis yog proportional ncaj qha. Qhov siab dua qhov viscosity, qhov ntau dua qhov ntub mortar yuav 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 mortar ntub nws tus kheej. Tsis tas li ntawd, thaum lub sijhawm tsim kho, qhov kev ua tau zoo tiv thaiv-sag ntawm cov mortar ntub tsis pom tseeb. Ntawm qhov tsis sib xws, qee qhov nruab nrab thiab qis viscosity tab sis hloov kho methyl cellulose ethers muaj kev ua tau zoo heev hauv kev txhim kho lub zog ntawm cov mortar ntub.
Qhov zoo ntawm cellulose ether tseem ceeb npaum li cas rau cov mortar?
Qhov zoo kuj yog ib qho tseem ceeb ntawm kev ua tau zoo ntawm methyl cellulose ether. MC siv rau cov hmoov qhuav mortar yuav tsum yog hmoov uas muaj cov dej tsawg, thiab qhov zoo kuj xav tau 20% txog 60% ntawm qhov loj me ntawm cov khoom me me kom tsawg dua 63m. Qhov zoo cuam tshuam rau qhov solubility ntawm methyl cellulose ether. Coarse MC feem ntau yog granular, uas yooj yim rau disperse thiab yaj hauv dej yam tsis muaj agglomeration, tab sis qhov kev yaj qeeb heev, yog li nws tsis haum rau siv rau hauv cov hmoov qhuav mortar. Qee cov khoom hauv tsev yog flocculent, tsis yooj yim rau disperse thiab yaj hauv dej, thiab yooj yim rau agglomerate. Hauv cov hmoov qhuav mortar, MC yog disperse ntawm cov ntaub ntawv cementing xws li aggregate, filler zoo thiab cement, thiab tsuas yog hmoov zoo txaus tuaj yeem zam methyl cellulose ether agglomeration thaum sib tov nrog dej. Thaum MC ntxiv nrog dej kom yaj cov agglomerates, nws nyuaj heev rau disperse thiab yaj. CoarseMCtsis yog tsuas yog pov tseg xwb, tab sis kuj txo qhov muaj zog ntawm cov mortar. Thaum cov hmoov mortar qhuav no siv rau hauv thaj chaw loj, qhov ceev ntawm cov mortar hauv zos yuav raug txo qis, thiab cov kab nrib pleb yuav tshwm sim vim yog lub sijhawm kho sib txawv. Rau cov mortar txau nrog kev tsim kho tshuab, qhov xav tau rau qhov zoo yog siab dua vim yog lub sijhawm sib tov luv dua.
Qhov zoo ntawm MC kuj muaj qee qhov cuam tshuam rau nws cov dej khaws cia. Feem ntau hais lus, rau methyl cellulose ethers nrog tib viscosity tab sis sib txawv fineness, nyob rau hauv tib qho ntxiv tus nqi, qhov finer qhov finer qhov zoo dua qhov dej khaws cia nyhuv.
Lub sijhawm tshaj tawm: Plaub Hlis-25-2024