Qhov ntau dua ntawm viscosityHPMChydroxypropyl methyl cellulose, qhov zoo dua qhov kev ua tau zoo ntawm kev khaws dej. Viscosity yog ib qho tseem ceeb ntawm HPMC kev ua tau zoo. Tam sim no, cov chaw tsim khoom HPMC sib txawv siv ntau txoj hauv kev 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 cov khoom tib yam, cov txiaj ntsig ntawm viscosity ntsuas los ntawm ntau txoj kev sib txawv yog txawv heev, qee qhov txawm tias muaj ntau qhov sib txawv. Yog li ntawd, thaum piv viscosity, nws yuav tsum tau ua tiav ntawm tib txoj kev xeem, suav nrog qhov kub thiab txias, rotor, thiab lwm yam.
Rau qhov loj ntawm cov khoom me me, cov khoom me me dua, qhov zoo dua qhov khaws dej. Cov khoom loj ntawm cellulose ether sib cuag 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 rau hauv, qee zaum ntev lub sijhawm do tsis tuaj yeem sib npaug dispersed yaj, tsim cov kua flocculent av nkos lossis agglomerate. Qhov solubility ntawm cellulose ether yog ib qho ntawm cov yam tseem ceeb xaiv cellulose ether. Fineness kuj yog ib qho tseem ceeb ntawm kev ua tau zoo ntawm methyl cellulose ether. MC rau cov mortar qhuav xav tau hmoov, cov dej tsawg, thiab fineness ntawm 20% ~ 60% qhov loj me tsawg dua 63um. Fineness cuam tshuam rau 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 ceev ntawm kev yaj qeeb heev, yog li nws tsis haum rau siv hauv cov mortar qhuav. Hauv cov mortar qhuav, MC raug faib ntawm cov aggregate, cov fillers zoo thiab cov ntaub ntawv cementing xws li cement, thiab tsuas yog cov hmoov uas zoo txaus tuaj yeem zam kev sib sau ua ke ntawm methyl cellulose ether thaum sib tov nrog dej. Thaum MC ntxiv dej los yaj agglomerate, nws nyuaj heev rau kev faib thiab yaj nws. MC nrog coarse fineness tsis yog tsuas yog pov tseg, tab sis kuj txo qhov muaj zog ntawm cov mortar hauv zos. Thaum cov mortar qhuav no raug tsim hauv thaj chaw loj, qhov ceev ntawm kev kho ntawm cov mortar qhuav hauv zos raug txo qis, ua rau muaj kev tawg vim yog lub sijhawm kho sib txawv. Rau cov mortar txau tshuab, vim yog lub sijhawm sib tov luv luv, qhov fineness siab dua.
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 yog, qhov siab dua qhov hnyav molecular ntawm MC yog, thiab qhov kev ua tau zoo ntawm kev yaj yuav txo qis sib xws, uas muaj qhov cuam tshuam tsis zoo rau lub zog thiab kev tsim kho ntawm mortar. Qhov siab dua qhov viscosity, qhov ntau dua qhov thickening nyhuv ntawm mortar, tab sis nws tsis yog proportional rau kev sib raug zoo. Qhov siab dua qhov viscosity, qhov ntub mortar yuav nplaum ntau dua, ob qho tib si kev tsim kho, kev ua tau zoo ntawm cov scraper nplaum thiab kev nplaum siab rau cov khoom siv hauv paus. Tab sis nws tsis pab kom nce lub zog ntawm cov mortar ntub. Thaum lub sijhawm tsim kho, qhov kev ua tau zoo tiv thaiv kev poob qis tsis pom tseeb. Ntawm qhov tsis sib xws, qee qhov viscosity qis tab sis hloov kho methyl cellulose ethers muaj kev ua tau zoo heev hauv kev txhim kho lub zog ntawm cov mortar ntub.
Qhov ntau cellulose ether ntxiv rau hauv cov mortar, qhov zoo dua ntawm kev khaws cia dej, qhov siab dua qhov viscosity, qhov zoo dua ntawm kev khaws cia dej.
HPMC fineness kuj muaj qee yam cuam tshuam rau nws cov dej khaws cia, 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 ntawm kev ntxiv, qhov finer dej khaws cia nyhuv zoo dua.
Qhov kev khaws dej ntawm HPMC kuj muaj feem cuam tshuam nrog qhov kub ntawm kev siv, thiab qhov kev khaws dej ntawm methyl cellulose ether txo qis nrog qhov nce ntawm qhov kub. Tab sis hauv daim ntawv thov cov khoom siv tiag tiag, ntau qhov chaw ntawm cov mortar qhuav feem ntau yuav nyob rau hauv qhov kub siab (siab dua 40 degrees) nyob rau hauv qhov xwm txheej ntawm kev tsim kho hauv cov khoom kub, xws li lub caij ntuj sov insolation ntawm phab ntsa sab nraud putty plastering, uas feem ntau ua kom ceev cov cement solidification thiab qhuav mortar hardening. Qhov txo qis ntawm cov dej khaws cia tus nqi ua rau muaj kev xav tias ob qho tib si constructability thiab tawg tsis kam raug cuam tshuam. Hauv qhov xwm txheej no, txo qhov cuam tshuam ntawm cov yam ntxwv kub dhau los ua qhov tseem ceeb heev. Txawm hais tias cov khoom ntxiv ntawm methyl hydroxyethyl cellulose ether raug suav hais tias yog nyob rau pem hauv ntej ntawm kev txhim kho thev naus laus zis, nws qhov kev vam khom rau qhov kub tseem yuav ua rau lub zog ntawm cov khoom ntawm qhuav mortar tsis muaj zog. Txawm tias nrog kev nce ntawm methyl hydroxyethyl cellulose koob tshuaj (lub caij ntuj sov mis), kev tsim kho thiab tawg tsis kam 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 kev nce qib ntawm etherification, cov dej khaws cia ntawm MC tuaj yeem tswj tau qhov zoo dua nyob rau hauv qhov kub siab, yog li nws tuaj yeem muab kev ua tau zoo dua nyob rau hauv cov xwm txheej hnyav.
Lub sijhawm tshaj tawm: Tsib Hlis-18-2022