Viscosity yog ib qho khoom tseem ceeb ntawm cellulose ether.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 yog, qhov siab dua qhov hnyav molecular ntawm cellulose ether yog, thiab solubility ntawm cellulose ether txo qis raws li.Qhov siab dua qhov viscosity yog, qhov pom tseeb dua cov nyhuv thickening, tab sis nws tsis yog proportional.Qhov siab dua qhov viscosity, cov nplaum ntub dej ntau yuav yog, hauv kev tsim kho, kev ua haujlwm ntawm cov nplaum nplaum nplaum thiab siab adhesion rau substrate.Tab sis nws tsis muaj txiaj ntsig los ua kom cov txheej txheem muaj zog ntawm cov mortar ntub nws tus kheej.Tsis tas li ntawd, thaum lub sij hawm tsim kho, kev ua tau zoo ntawm cov mortar ntub dej los tiv thaiv kev ua haujlwm tsis pom tseeb.Hauv qhov sib piv, qee qhov hloov kho Methyl cellulose nrog qis mus rau nruab nrab viscosity pom kev txhim kho hauv cov txheej txheem lub zog ntawm cov mortar ntub dej.Cov khoom siv phab ntsa hauv tsev feem ntau yog cov qauv ntxeem tau, lawv muaj dej nqus.Thiab cov khoom siv hauv tsev gypsum siv rau kev tsim kho phab ntsa, tom qab ntxiv dej hloov ntawm phab ntsa, cov dej noo yog yooj yim absorbed los ntawm phab ntsa, ua rau cov gypsum tsis muaj cov dej noo tsim nyog rau hydration, ua rau muaj teeb meem hauv plastering kev tsim kho thiab txo lub zog ntawm daim ntawv cog lus. , yog li muaj cov kab nrib pleb, hollow nruas, spalling thiab lwm yam teeb meem zoo.Kev txhim kho cov dej tuav ntawm cov khoom siv hauv tsev gypsum tuaj yeem daws qhov teeb meem ntawm kev tsim kho kom zoo thiab txhim kho kev sib raug zoo nrog cov phab ntsa.Yog li ntawd, tus neeg saib xyuas dej tuav tau dhau los ua ib qho tseem ceeb ntawm cov khoom siv hauv tsev gypsum.
Txhawm rau ua kom yooj yim rau kev tsim kho, cov ntaub ntawv hauv tsev xws li plaster, nplaum plaster, sib koom ua ke plaster thiab plaster putty, thiab gypsum retarder yog ntxiv rau hauv kev tsim khoom kom ncua sij hawm tsim kho ntawm plaster paste, vim tias cov txheej txheem hydration ntawm hemihydrate. gypsum yog txwv tsis pub los ntawm kev ntxiv retarder rau gypsum, hom gypsum muab tshuaj txhuam yuav tsum nyob twj ywm rau ntawm phab ntsa rau 1-2 teev ua ntej teeb tsa, thiab feem ntau ntawm cov phab ntsa muaj cov khoom nqus dej, tshwj xeeb tshaj yog cov khoom siv phab ntsa tshiab xws li cib ntsa, aerated pob zeb phab ntsa, perforated thermal rwb thaiv tsev vaj huam sib luag, yog li kom ua tiav cov dej-tswj kev kho mob ntawm gypsum slurry, kom tsis txhob muaj kev hloov ntawm qee cov dej slurry rau phab ntsa, ua rau cov gypsum paste hardens thaum cov dej tsis txaus, cov dej tsis tiav. , ua rau cov gypsum thiab cov phab ntsa nto qhov chaw sib cais, lub plhaub.Ntxiv dej-retaining tus neeg saib xyuas yog ua kom cov dej noo muaj nyob rau hauv gypsum muab tshuaj txhuam, kom ntseeg tau tias cov tshuaj tiv thaiv hydration ntawm gypsum muab tshuaj txhuam ntawm qhov sib txuas, yog li ua kom muaj zog ntawm daim ntawv cog lus.Cov khoom siv dej khaws cia yog cov cellulose ethers, xws li Methyl cellulose (MC), hypromellose (HPMC), hydroxyethyl methyl cellulose (HEMC), lwm..Tsis tas li ntawd, polyvinyl cawv, sodium alginate, hloov cov hmoov txhuv nplej siab, diatomite thiab hmoov av tsawg kuj tuaj yeem siv los txhim kho cov dej tuav.
Post lub sij hawm: Lub Xya hli ntuj-26-2023