Nyob rau hauv xyoo tas los no, nrog kev txhim kho txuas ntxiv ntawm sab nrauv phab ntsa thermal rwb thaiv tsev thev naus laus zis, kev nce qib ntawm hydroxypropyl methyl cellulose ntau lawm technology, thiab cov yam ntxwv zoo heev ntawm hydroxypropyl methyl cellulose HPMC nws tus kheej, hydroxypropyl methyl cellulose HPMC tau siv dav hauv kev tsim kho kev lag luam.
teem sijhawm
Lub sijhawm teeb tsa ntawm cov pob zeb yog feem ntau cuam tshuam nrog lub sijhawm teeb tsa ntawm cov cement, thiab qhov sib sau ua ke muaj kev cuam tshuam me ntsis.Yog li ntawd, lub sijhawm teem sijhawm ntawm mortar tuaj yeem siv los hloov cov kev tshawb fawb txog kev cuam tshuam ntawm HPMC ntawm lub sijhawm teeb tsa ntawm cov dej hauv qab dej tsis sib xyaw ua ke.Txij li thaum lub sijhawm teeb tsa ntawm mortar cuam tshuam los ntawm cov dej cement piv thiab cov cement xuab zeb piv, txhawm rau ntsuas qhov cuam tshuam ntawm HPMC ntawm lub sijhawm teeb tsa ntawm mortar, nws yog qhov yuav tsum tau kho cov dej cement piv thiab cement xuab zeb piv ntawm mortar.
Cov tshuaj tiv thaiv kev sim qhia tau hais tias qhov sib ntxiv ntawm HPMC muaj qhov cuam tshuam tsis zoo ntawm cov tshuaj khib nyiab sib xyaw, thiab lub sijhawm teeb tsa ntawm mortar nce nrog qhov nce ntawm cov cellulose ether HPMC.Nrog tib tus nqi ntawm HPMC, lub sijhawm teeb tsa ntawm mortar tsim nyob rau hauv dej yog ntev tshaj li qhov tsim hauv huab cua.Thaum ntsuas hauv dej, lub sijhawm teeb tsa ntawm mortar tov nrog HPMC yog 6 ~ 18 teev tom qab hauv qhov chaw pib thiab 6 ~ 22 teev tom qab hauv qhov chaw kawg tshaj li ntawm cov qauv dawb.Yog li, HPMC yuav tsum tau siv ua ke nrog tus neeg sawv cev muaj zog thaum ntxov.
HPMC yog ib qho polymer nrog macromolecular linear qauv, nrog hydroxyl pawg ntawm cov pab pawg ua haujlwm, uas tuaj yeem tsim cov ntawv cog lus hydrogen nrog kev sib xyaw dej molecules kom nce cov viscosity ntawm cov dej sib tov.Qhov ntev molecular chains ntawm HPMC yuav nyiam ib leeg, ua rau HPMC molecules intertwine los tsim ib tug network qauv, thiab qhwv cov cement thiab sib tov dej.Raws li HPMC tsim cov qauv network zoo ib yam li zaj duab xis thiab qhwv cov cement, nws tuaj yeem tiv thaiv kom tsis txhob muaj dej hauv cov tshuaj khib nyiab thiab cuam tshuam lossis ua kom cov cement hydration.
Ntshav
Qhov tshwm sim los ntshav ntawm mortar zoo ib yam li cov pob zeb, uas yuav ua rau muaj kev sib haum xeeb ntawm cov aggregates, nce cov dej cement piv ntawm cov txheej saum toj kawg nkaus slurry, ua rau cov txheej saum toj kawg nkaus slurry kom muaj cov yas loj, los yog tawg thaum ntxov, thiab lub zog ntawm slurry nto yog qhov tsis muaj zog.
Thaum cov koob tshuaj ntau dua 0.5%, tsis muaj qhov tshwm sim los ntshav.Qhov no yog vim hais tias thaum HPMC tov rau hauv mortar, HPMC muaj zaj duab xis-tsim thiab reticular qauv, nrog rau cov adsorption ntawm hydroxyl ntawm cov saw ntev ntawm macromolecule, uas ua rau cov cement thiab sib tov dej nyob rau hauv mortar daim ntawv flocculent, kom ruaj khov qauv. mortar.Thaum HPMC ntxiv rau hauv mortar, ntau cov npuas me me ywj siab yuav raug tsim.Cov npuas no yuav sib npaug sib npaug hauv cov tshuaj khib nyiab thiab cuam tshuam qhov kev tso tawm ntawm cov khoom sib xyaw.Qhov kev ua tau zoo ntawm HPMC no muaj kev cuam tshuam zoo rau cov khoom siv cement, thiab feem ntau yog siv los npaj cov cement-based composites tshiab xws li mortar qhuav thiab polymer mortar, kom lawv muaj dej zoo thiab cov yas tuav.
Cov dej xav tau ntawm mortar
Thaum tus nqi ntawm HPMC tsawg heev, nws muaj kev cuam tshuam zoo rau cov dej xav tau ntawm mortar.Raws li qhov xwm txheej uas qhov nthuav dav ntawm cov mortar tshiab yog qhov zoo ib yam, tus nqi ntawm HPMC thiab cov dej xav tau ntawm mortar hloov linearly nyob rau hauv ib lub sij hawm ntawm lub sij hawm, thiab cov dej xav tau ntawm mortar txo qis ua ntej thiab tom qab ntawd nce.Thaum HPMC cov ntsiab lus tsawg dua 0.025%, nrog qhov nce ntawm HPMC cov ntsiab lus, cov dej xav tau ntawm cov mortar txo qis hauv tib qhov kev nthuav dav, uas qhia tau hais tias qhov me me ntawm cov ntsiab lus HPMC, cov dej txo cov nyhuv ntawm cov tshuaj khib nyiab.Cov huab cua entraining nyhuv ntawm HPMC ua rau lub mortar muaj ib tug loj tus naj npawb ntawm me me npuas npuas, uas ua lub luag hauj lwm nyob rau hauv lubrication thiab txhim kho lub fluidity ntawm mortar.Thaum qhov ntau npaum li cas ntau dua 0.025%, cov dej xav tau ntawm mortar nce nrog qhov nce ntawm qhov ntau npaum li cas, uas yog vim muaj kev ncaj ncees ntxiv ntawm cov qauv ntawm HPMC, qhov luv ntawm qhov sib txawv ntawm cov flocs ntawm cov saw ntev molecular, qhov attraction thiab cohesion, thiab txo qhov fluidity ntawm mortar.Yog li ntawd, thaum lub expansion degree yog tib yam, lub slurry qhia tau hais tias ib tug nce nyob rau hauv dej thov.
Post lub sij hawm: Nov-25-2022