Cellulose ether rau gypsum mortar

Ob leeg carboxymethyl cellulose thiab methyl cellulose tuaj yeem siv los ua cov dej khaws cia rau plaster, tab sis cov dej khaws cov nyhuv 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 retarding thiab txo lub zog ntawm plaster ntawm paris. Methyl cellulose yog ib qho zoo tagnrho admixture rau gypsum cementitious cov ntaub ntawv ua ke nrog dej tuav, thickening, ntxiv dag zog rau, thiab viscosifying, tshwj tsis yog tias qee hom muaj cov nyhuv retarding thaum ntau npaum li cas. siab tshaj carboxymethyl cellulose. Vim li no, feem ntau gypsum composite gelling cov ntaub ntawv tau txais cov txheej txheem ntawm kev sib xyaw carboxymethyl cellulose thiab methyl cellulose, uas tsis tsuas yog siv lawv cov yam ntxwv (xws li cov nyhuv retarding ntawm carboxymethyl cellulose, lub zog txhawb zog ntawm methyl cellulose), thiab siv lawv cov txiaj ntsig zoo. (xws li lawv cov dej tuav thiab cov nyhuv thickening). Nyob rau hauv txoj kev no, ob qho tib si dej tuav kev ua tau zoo 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 yog khaws cia ntawm qhov qis tshaj.

Qhov viscosity ntawm methyl cellulose ether tseem ceeb npaum li cas rau gypsum mortar?

Viscosity yog ib qho tseem ceeb parameter ntawmmethyl cellulose etherkev ua tau zoo.

Feem ntau hais lus, qhov siab dua qhov viscosity, qhov zoo dua cov dej tuav cov nyhuv ntawm gypsum mortar. Txawm li cas los xij, qhov siab dua qhov viscosity, siab dua qhov hnyav molecular ntawm methyl cellulose ether, thiab kev txo qis hauv nws cov solubility yuav muaj kev cuam tshuam tsis zoo rau lub zog thiab kev tsim kho 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 yog manifested raws li sticking rau lub scraper thiab siab adhesion rau lub substrate. Tab sis nws tsis muaj txiaj ntsig los ua kom lub zog muaj zog ntawm cov mortar ntub nws tus kheej. Tsis tas li ntawd, thaum lub sij hawm tsim kho, qhov kev ua tau zoo los tiv thaiv sag ntawm ntub mortar 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 hauv kev txhim kho lub zog ntawm cov khoom ntub dej.

Qhov tseem ceeb npaum li cas ntawm cov cellulose ether rau mortar?

Fineness kuj yog ib qho tseem ceeb Performance index ntawm methyl cellulose ether. MC siv rau cov hmoov qhuav mortar yuav tsum yog cov hmoov uas muaj dej tsawg, thiab cov fineness kuj yuav tsum tau 20% mus rau 60% ntawm particle loj yuav tsum tsawg tshaj li 63m. Lub fineness cuam tshuam rau solubility ntawm methyl cellulose ether. Coarse MC feem ntau yog granular, uas yog ib qho yooj yim rau disperse thiab yaj nyob rau hauv dej tsis muaj agglomeration, tab sis lub dissolution tus nqi qeeb heev, yog li nws tsis haum rau siv nyob rau hauv qhuav hmoov mortar. Qee cov khoom siv hauv tsev yog flocculent, tsis yooj yim rau disperse thiab yaj hauv dej, thiab yooj yim rau agglomerate. Nyob rau hauv qhuav hmoov mortar, MC yog dispersed ntawm aggregates, nplua fillers thiab cement thiab lwm yam ntaub ntawv cementing. Tsuas yog cov 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. Coarse MC 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 siv rau hauv ib cheeb tsam loj, kev kho ceev ntawm cov tshuaj khib hauv zos yuav txo qis, thiab cov kab nrib pleb yuav tshwm sim vim lub sijhawm sib txawv. Rau cov tshuaj txau nrog cov khoom siv kho tshuab, qhov yuav tsum tau ua kom zoo yog siab dua vim lub sijhawm sib xyaw luv.

Qhov zoo ntawm MC kuj muaj qee yam cuam tshuam rau nws cov dej tuav. Feem ntau hais lus, rau methyl cellulose ethers nrog tib viscosity tab sis txawv fineness, nyob rau hauv tib qhov sib ntxiv, qhov finer lub finer qhov zoo dua cov dej tuav nyhuv.