Hydroxypropyl methyl cellulose
Kev teem sijhawm sim
Lub sijhawm teeb tsa ntawm cov pob zeb feem ntau yog cuam tshuam nrog lub sijhawm teeb tsa ntawm cov cement, qhov cuam tshuam ntawm cov khoom sib xyaw tsis loj, yog li lub sijhawm teeb tsa ntawm cov mortar tuaj yeem siv hloov chaw kawm ntawm HPMC rau lub sijhawm teeb tsa cov pob zeb hauv qab dej uas tsis tawg, qhov cuam tshuam ntawm kev sib tov vim lub sijhawm teeb tsa los ntawm qhov sib piv ntawm dej-cement ntawm mortar, qhov cuam tshuam ntawm cov xuab zeb cement, yog li txhawm rau ntsuas HPMC cuam tshuam rau lub sijhawm teeb tsa mortar, Qhov sib piv ntawm dej-cement thiab cov xuab zeb cement ntawm mortar yuav tsum tau kho.
HPMC yog ib qho qauv macromolecule linear, nrog rau pawg hydroxyl ntawm pawg ua haujlwm, uas tuaj yeem tsim cov hydrogen bonds nrog cov dej sib tov thiab ua rau cov dej sib tov viscosity nce ntxiv. HPMC cov saw ntev molecular yuav rub ib leeg, yog li ntawd HPMC molecules intertwine nrog ib leeg los tsim ib lub network qauv, cov cement, sib tov dej qhwv. Vim tias HPMC tsim ib lub network qauv zoo ib yam li zaj duab xis nyias thiab cov nyhuv qhwv ntawm cement, nws yuav tiv thaiv tau qhov evaporation ntawm cov dej noo hauv mortar, cuam tshuam lossis qeeb qeeb qhov hydration ntawm cement.
Kev ntsuam xyuas dej ntws
Qhov dej ntws ntawm cov mortar zoo ib yam li cov pob zeb ua vaj tse, uas yuav ua rau muaj kev sib sau ua ke loj heev, ua rau muaj kev nce ntxiv ntawm cov dej-cement piv ntawm cov txheej sab saud ntawm cov slurry, thiab ua rau cov txheej sab saud ntawm cov slurry muaj cov yas shrinkage loj lossis txawm tias tawg thaum ntxov, thiab lub zog ntawm cov txheej saum npoo ntawm cov slurry tsis muaj zog heev. Los ntawm kev sim, nws tuaj yeem pom tias thaum cov khoom sib tov ntau dua 0.5%, tsis muaj dej xau. Qhov no yog vim tias thaumHPMCYog sib xyaw rau hauv cov mortar, HPMC muaj cov zaj duab xis tsim thiab cov qauv network, nrog rau kev nqus ntawm hydroxyl ntawm cov saw ntev ntawm macromolecules, yog li ntawd cov cement hauv mortar thiab cov dej sib tov tsim flocculation, kom ntseeg tau tias cov qauv ruaj khov ntawm lub cev mortar. Tom qab ntxiv HPMC hauv mortar dua, ntau lub npuas me me ywj pheej yuav tsim. Cov npuas no yuav raug faib sib npaug hauv cov mortar thiab cuam tshuam kev tso cov khoom sib sau ua ke. HPMC kev ua tau zoo ntawm cov ntaub ntawv cement muaj qhov cuam tshuam loj heev, feem ntau siv los npaj xws li mortar qhuav, polymer mortar thiab lwm yam khoom siv cement tshiab, yog li nws muaj kev khaws cia dej zoo, plasticity.
Lub sijhawm tshaj tawm: Plaub Hlis-26-2024