Redispersible latex hmoov nrog rau lwm yam inorganic binders (xws li cement, slaked txiv qaub, gypsum, thiab lwm yam) thiab ntau yam aggregates, fillers thiab lwm yam additives (xws li methyl hydroxypropyl cellulose ether, starch ether, lignocellulose, hydrophobic agent, thiab lwm yam) rau lub cev sib tov ua kom qhuav-mixed mortar. Thaum cov hmoov sib tov qhuav ntxiv rau hauv dej thiab nplawm, cov hmoov latex yuav raug xa mus rau hauv dej raws li kev ua ntawm hydrophilic tiv thaiv colloid thiab mechanical shear. Lub sij hawm yuav tsum tau rau ib txwm redispersible latex hmoov rau disperse yog luv heev, thiab lub sij hawm redispersion Performance index kuj yog ib qho tseem ceeb parameter rau kev ntsuam xyuas nws zoo. Nyob rau theem pib sib xyaw, cov hmoov latex twb tau pib cuam tshuam rau rheology thiab kev ua haujlwm ntawm cov tshuaj khib.
Vim muaj cov yam ntxwv sib txawv thiab kev hloov kho ntawm txhua qhov subdivided latex hmoov, cov nyhuv no kuj txawv, qee qhov muaj cov nyhuv ntws-pab, thiab qee qhov muaj cov nyhuv thixotropy. Cov txheej txheem ntawm nws cov kev cuam tshuam los ntawm ntau yam, nrog rau kev cuam tshuam ntawm cov hmoov latex ntawm kev sib raug zoo ntawm cov dej thaum lub sij hawm dispersion, kev cuam tshuam ntawm txawv viscosity ntawm latex hmoov tom qab dispersion, kev cuam tshuam ntawm kev tiv thaiv colloid, thiab kev cuam tshuam ntawm cement thiab dej siv. Influences muaj xws li qhov nce ntawm huab cua cov ntsiab lus nyob rau hauv lub mortar thiab kev faib ntawm huab cua npuas, raws li zoo raws li lub zog ntawm nws tus kheej additives thiab kev cuam tshuam nrog lwm yam additives. Yog li ntawd, kev kho kom haum thiab kev xaiv ntawm cov khoom siv rov ua dua tshiab latex hmoov yog ib qho tseem ceeb uas cuam tshuam rau cov khoom zoo. Lub ntsiab lus ntau dua ntawm kev pom yog tias cov hmoov latex redispersible feem ntau ua rau cov huab cua ntawm cov tshuaj khib, yog li lubricating kev tsim kho ntawm mortar, thiab affinity thiab viscosity ntawm cov hmoov latex, tshwj xeeb tshaj yog kev tiv thaiv colloid, rau dej thaum nws tawg. Qhov nce ntawm cov concentration pab txhim kho kev sib koom ua ke ntawm cov tshuaj khib nyiab, yog li txhim kho kev ua haujlwm ntawm mortar. Tom qab ntawd, cov ntaub ntub dej uas muaj cov hmoov latex dispersion yog siv rau ntawm qhov chaw ua haujlwm. Nrog kev txo cov dej ntawm peb theem - qhov nqus ntawm lub hauv paus txheej, kev noj cov cement hydration cov tshuaj tiv thaiv, thiab cov volatilization ntawm cov dej saum npoo av mus rau saum huab cua, cov resin hais maj mam mus, cov kev sib tshuam maj mam sib koom ua ke, thiab thaum kawg ua. ib tug nruam polymer zaj duab xis. Cov txheej txheem no feem ntau tshwm sim hauv qhov pores ntawm cov tshuaj khib thiab qhov chaw ntawm cov khoom.
Nws yuav tsum tau muab sau tseg tias nyob rau hauv thiaj li yuav ua rau cov txheej txheem no irreversible, uas yog, thaum lub polymer zaj duab xis ntsib dej dua, nws yuav tsis tau dispersed dua, thiab cov kev tiv thaiv colloid ntawm redispersible latex hmoov yuav tsum tau muab cais los ntawm lub polymer zaj duab xis system. Qhov no tsis yog teeb meem nyob rau hauv alkaline cement mortar system, vim hais tias nws yuav saponified los ntawm alkali generated los ntawm cement hydration, thiab nyob rau tib lub sij hawm, lub adsorption ntawm quartz-zoo li cov ntaub ntawv yuav maj mam cais nws los ntawm lub system, tsis muaj kev tiv thaiv. hydrophilicity Colloids, uas yog insoluble nyob rau hauv dej thiab tsim los ntawm ib-lub sij hawm dispersion ntawm redispersible latex hmoov, yuav ua hauj lwm tsis tau tsuas yog nyob rau hauv qhuav tej yam kev mob, tab sis kuj nyob rau hauv ib lub sij hawm dispersion. mus sij hawm ntev immersion tej yam kev mob. Hauv cov tshuab uas tsis yog-alkaline, xws li gypsum systems lossis cov tshuab uas tsuas yog muab tso rau, vim qee qhov kev tiv thaiv colloid tseem muaj qee qhov hauv cov yeeb yaj kiab polymer kawg, uas cuam tshuam rau cov dej tsis kam ntawm cov yeeb yaj kiab, tab sis vim tias cov tshuab no tsis siv rau hauv Cov ntaub ntawv ntawm kev nkag mus rau hauv dej mus ntev, thiab cov polymer tseem muaj nws cov khoom siv kho tshuab tshwj xeeb, nws tsis cuam tshuam rau daim ntawv thov ntawm redispersible latex hmoov hauv cov tshuab no.
Nrog rau kev tsim cov yeeb yaj kiab polymer zaum kawg, lub hauv paus txheej txheem tsim los ntawm cov khoom siv tsis zoo thiab cov organic binders yog tsim nyob rau hauv cov tshuaj mortar, uas yog, cov khoom siv hydraulic tsim ib lub nkig thiab tawv, thiab cov latex hmoov redispersible ua ib zaj duab xis ntawm qhov sib txawv thiab cov khoom nto. Kev sib txuas yooj yim. Qhov kev sib txuas zoo li no tuaj yeem xav txog tias tau txuas nrog cov pob txha pob txha los ntawm ntau qhov me me. Txij li thaum lub zog tensile ntawm polymer resin zaj duab xis tsim los ntawm latex hmoov feem ntau yog ib qho kev txiav txim ntawm qhov loj dua li ntawm cov ntaub ntawv hydraulic, lub zog ntawm cov mortar nws tus kheej tuaj yeem txhim kho, uas yog, cohesion yuav txhim kho. Txij li qhov yooj thiab deformability ntawm cov polymer yog ntau dua li cov qauv nruj xws li cov cement, deformability ntawm mortar yog txhim kho, thiab cov nyhuv ntawm dispersing kev nyuaj siab yog heev txhim khu kev qha, yog li txhim kho cov tawg kuj ntawm lub mortar.
Post lub sij hawm: Mar-07-2023