Viscosity yog ib qho tseem ceeb ntawm cov cellulose ether. Feem ntau, qhov viscosity siab dua, qhov zoo dua qhov dej-retaining effect ntawm gypsum mortar. Txawm li cas los xij, qhov viscosity siab dua, qhov hnyav molecular ntawm cellulose ether siab dua, thiab solubility ntawm cellulose ether txo qis raws li. Qhov viscosity siab dua, qhov thickening effect pom tseeb dua, tab sis nws tsis yog proportional. Qhov viscosity siab dua, qhov nplaum ntau dua ntawm cov ntub mortar yuav, hauv kev tsim kho, kev ua tau zoo ntawm sticking scraper thiab kev nplaum siab rau lub substrate. Tab sis nws tsis pab kom nce lub zog ntawm cov ntub mortar nws tus kheej. Tsis tas li ntawd, thaum lub sijhawm tsim kho, kev ua tau zoo ntawm cov ntub mortar tiv thaiv kev poob qis tsis pom tseeb. Hauv kev sib piv, qee qhov hloov kho Methyl cellulose nrog qis mus rau nruab nrab viscosity tau qhia txog kev txhim kho hauv lub zog ntawm cov ntub mortar. Cov ntaub ntawv phab ntsa tsev feem ntau yog cov qauv porous, lawv muaj dej nqus. Thiab cov ntaub ntawv siv rau kev tsim phab ntsa gypsum, tom qab ntxiv dej modulation rau ntawm phab ntsa, cov dej noo yooj yim kom phab ntsa nqus tau, ua rau gypsum tsis muaj dej noo tsim nyog rau kev ua kom noo, ua rau muaj teeb meem hauv kev tsim kho plastering thiab txo qhov muaj zog sib txuas, yog li muaj cov kab nrib pleb, lub nruas hollow, spalling thiab lwm yam teeb meem zoo. Kev txhim kho qhov khaws dej ntawm cov ntaub ntawv siv gypsum tuaj yeem daws qhov teeb meem ntawm kev tsim kho zoo thiab txhim kho lub zog sib txuas nrog phab ntsa. Yog li ntawd, tus neeg sawv cev khaws dej tau dhau los ua ib qho ntawm cov khoom siv tseem ceeb ntawm cov ntaub ntawv siv gypsum.
Yuav kom yooj yim rau kev tsim kho, cov khoom siv hmoov tsev xws li plaster, nplaum plaster, sib koom ua ke plaster thiab plaster putty siv, thiab gypsum retarder ntxiv rau hauv kev tsim khoom kom ntev lub sijhawm tsim kho ntawm plaster paste, vim tias cov txheej txheem hydration ntawm hemihydrate gypsum raug txwv los ntawm kev ntxiv retarder rau gypsum, hom gypsum paste no yuav tsum nyob 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 phab ntsa cib, phab ntsa aerated concrete, perforated thermal insulation panels, yog li ua kom dej-tuav kev kho mob ntawm gypsum slurry, kom tsis txhob hloov qee qhov dej slurry mus rau phab ntsa, ua rau gypsum paste tawv thaum dej tsis txaus, hydration tsis tiav, ua rau gypsum thiab phab ntsa qhov chaw sib cais, lub plhaub. Ntxiv dej-tuav tus neeg sawv cev yog kom khaws cov dej noo uas muaj nyob hauv gypsum paste, kom ntseeg tau tias cov tshuaj tiv thaiv hydration ntawm gypsum paste ntawm qhov sib tshuam, yog li ua kom muaj zog sib txuas. Cov neeg sawv cev dej-tuav feem ntau yog cellulose ethers, xws li Methyl cellulose (MC), hypromellose (HPMC), hydroxyethyl methyl cellulose (HEMC), thiab lwm yam. Tsis tas li ntawd, polyvinyl cawv, sodium alginate, modified starch, diatomite thiab rare earth hmoov kuj tseem siv tau los txhim kho kev khaws dej.
Lub sijhawm tshaj tawm: Lub Xya Hli-26-2023