Qhov ntau dua qhov viscosity ntawmHPMChydroxypropyl methyl cellulose, qhov zoo dua cov dej tuav kev ua haujlwm. Viscosity yog qhov tseem ceeb ntawm HPMC kev ua haujlwm. Tam sim no, cov tuam txhab HPMC sib txawv siv cov kev sib txawv thiab cov cuab yeej los txiav txim siab qhov viscosity ntawm HPMC. Cov txheej txheem tseem ceeb yog Haake Rotovisko, Hoppler, Ubbelohde thiab Brookfield, thiab lwm yam.
Rau tib yam khoom, cov txiaj ntsig ntawm viscosity ntsuas los ntawm ntau txoj kev sib txawv heev, qee qhov txawm tias ntau qhov sib txawv. Yog li ntawd, thaum sib piv viscosity, nws yuav tsum tau nqa tawm ntawm tib txoj kev sim, xws li kub, rotor, thiab lwm yam.
Rau particle loj, qhov finer particle, qhov zoo dua cov dej tuav. Cov khoom loj ntawm cellulose ether tiv tauj nrog dej, qhov chaw tam sim ntawd yaj thiab tsim cov gel los qhwv cov khoom kom tiv thaiv cov dej molecules los ntawm kev txuas ntxiv mus, qee zaum ntev stirring tsis tuaj yeem sib npaug dispersed yaj, tsim cov av nkos flocculent tov los yog agglomerate. Lub solubility ntawm cellulose ether yog ib qho ntawm cov yam ntxwv los xaiv cellulose ether. Fineness kuj yog ib qho tseem ceeb Performance index ntawm methyl cellulose ether. MC rau mortar qhuav yuav tsum tau hmoov, cov dej tsis muaj dej, thiab fineness ntawm 20% ~ 60% particle loj tsawg dua 63um. Fineness cuam tshuam cov solubility ntawmHPMChydroxypropyl methyl cellulose ether. Coarse MC feem ntau yog granular thiab tuaj yeem yaj tau yooj yim hauv dej yam tsis muaj agglomerating, tab sis qhov kev sib cais nrawm yog qeeb heev, yog li nws tsis haum rau siv hauv mortar qhuav. Hauv mortar qhuav, MC yog sib cais ntawm cov sib sau ua ke, cov khoom ua kom zoo thiab cov khoom siv cementing xws li cov cement, thiab tsuas yog cov hmoov uas zoo txaus tuaj yeem zam qhov clumping ntawm methyl cellulose ether thaum sib tov nrog dej. Thaum MC ntxiv dej kom yaj agglomerate, nws nyuaj heev rau disperse thiab yaj nws. MC nrog ntxhib fineness tsis tsuas yog khib nyiab, tab sis kuj txo lub zog hauv zos ntawm mortar. Thaum xws li mortar qhuav yog tsim nyob rau hauv ib tug loj cheeb tsam, lub curing ceev ntawm lub zos mortar qhuav yog ho txo, uas ua rau tawg los ntawm txawv sij hawm curing. Rau cov neeg kho tshuab txau mortar, vim lub sijhawm sib tov luv luv, qhov kev ua tau zoo dua.
Feem ntau hais lus, qhov siab dua qhov viscosity, qhov zoo dua cov dej tuav. Txawm li cas los xij, qhov siab dua qhov viscosity yog, qhov siab dua qhov hnyav molecular ntawm MC yog, thiab qhov kev ua tiav ntawm kev sib cais yuav txo qis, uas 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 ntawm mortar, tab sis nws tsis yog proportional rau kev sib raug zoo. Qhov siab dua qhov viscosity, cov khib nyiab ntub yuav ntau nplaum, ob qho tib si kev tsim kho, kev ua haujlwm ntawm cov nplaum nplaum nplaum thiab siab adhesion rau cov khoom siv hauv paus. Tab sis nws tsis muaj txiaj ntsig los ua kom lub zog muaj zog ntawm cov mortar ntub dej. Thaum lub sij hawm tsim kho, qhov kev ua tau zoo anti-sag tsis pom tseeb. Ntawm qhov tsis sib xws, qee qhov tsis muaj 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 ntau cellulose ether ntxiv rau hauv mortar, cov dej tuav tau zoo dua, qhov viscosity siab dua, cov dej tuav tau zoo dua.
HPMC fineness kuj muaj qee yam cuam tshuam rau nws cov dej tuav, feem ntau hais lus, rau tib lub viscosity thiab sib txawv fineness ntawm methyl cellulose ether, nyob rau hauv cov ntaub ntawv ntawm tib tus nqi ntxiv, lub finer cov dej tuav nyhuv yog zoo dua.
Cov dej tuav ntawm HPMC kuj muaj feem xyuam rau qhov kub ntawm kev siv, thiab cov dej tuav ntawm methyl cellulose ether txo qis nrog qhov kub thiab txias. Tab sis nyob rau hauv cov ntaub ntawv siv tiag tiag, ntau qhov chaw ntawm cov mortar qhuav feem ntau yuav nyob rau hauv qhov kub thiab txias (siab tshaj 40 degrees) nyob rau hauv cov xwm txheej ntawm kev tsim kho nyob rau hauv kub substrate, xws li lub caij ntuj sov insolation ntawm sab nrauv phab ntsa putty plastering, uas feem ntau accelerates lub solidification ntawm. cement thiab qhuav mortar hardening. Qhov txo qis ntawm cov dej tuav tus nqi ua rau pom pom tseeb tias ob qho tib si constructability thiab cracking kuj raug cuam tshuam. Hauv qhov xwm txheej no, txo qhov cuam tshuam ntawm qhov kub thiab txias yog qhov tseem ceeb heev. Txawm hais tias cov additive ntawm methyl hydroxyethyl cellulose ether yog suav hais tias yog nyob rau hauv lub forefront ntawm kev tsim kho technology, nws dependence rau kub tseem yuav ua rau lub weakening ntawm cov khoom ntawm qhuav mortar. Txawm hais tias qhov nce ntawm methyl hydroxyethyl cellulose ntau npaum li cas (lub caij ntuj sov mis), kev tsim kho thiab kev sib tsoo tseem tsis tuaj yeem ua tau raws li qhov xav tau ntawm kev siv. Los ntawm qee qhov kev kho tshwj xeeb ntawm MC, xws li nce qib ntawm etherification, cov dej tuav cov nyhuv ntawm MC tuaj yeem tswj tau cov nyhuv zoo dua nyob rau hauv qhov kub thiab txias, kom nws tuaj yeem muab kev ua tau zoo dua hauv cov xwm txheej hnyav.
Post lub sij hawm: May-18-2022