Dispersible polymer hmoov thiab lwm yam inorganic binders (xws li cov 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 Agents, thiab lwm yam) yog lub cev sib xyaw ua kom qhuav. Thaum cov mortar qhuav sib tov nrog dej, nyob rau hauv qhov kev txiav txim ntawm hydrophilic tiv thaiv colloid thiab mechanical shearing, latex hmoov hais yuav disperse rau hauv dej.
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 ntawm kev txhawb nqa, thaum qee qhov muaj cov nyhuv ntawm 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 qhov sib txawv viscosity ntawm cov hmoov latex tom qab dispersion, kev cuam tshuam ntawm kev tiv thaiv colloid, thiab kev cuam tshuam ntawm cov cement thiab dej siv. Kev cuam tshuam ntawm cov hauv qab no suav nrog kev cuam tshuam ntawm qhov nce ntawm huab cua cov ntsiab lus ntawm mortar thiab kev faib tawm ntawm huab cua npuas, nrog rau kev cuam tshuam ntawm nws tus kheej additives thiab kev cuam tshuam nrog lwm cov additives. Yog li ntawd, kev kho kom haum thiab subdivided xaiv ntawm redispersible polymer hmoov yog ib qho tseem ceeb txhais tau tias cuam tshuam cov khoom zoo. Ntawm lawv, qhov kev pom ntau dua yog tias cov hmoov polymer residersible feem ntau ua rau cov ntsiab lus ntawm cov mortar, yog li lubricating kev tsim kho ntawm mortar, thiab affinity thiab viscosity ntawm cov hmoov polymer, tshwj xeeb tshaj yog thaum cov tshuaj tiv thaiv colloid dispersed, rau dej. Qhov nce ntawm α pab txhawb kev txhim kho ntawm kev sib koom ua ke ntawm kev tsim kho mortar, 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 qhov chaw ua haujlwm. Nrog rau qhov txo qis ntawm peb theem - qhov nqus ntawm lub hauv paus txheej, kev noj cov cement hydration cov tshuaj tiv thaiv, thiab cov volatilization ntawm cov av noo nyob rau hauv cov huab cua, cov resin hais maj mam mus rau hauv, lub interface 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 nyob rau hauv qhov pores ntawm cov tshuaj khib thiab qhov chaw ntawm cov khoom.
Nws yuav tsum tau hais tias, txhawm rau ua kom cov txheej txheem no hloov tsis tau, uas yog, thaum cov yeeb yaj kiab polymer tsis rov ua dua thaum nws ntsib dej dua, kev tiv thaiv colloid ntawm redispersible polymer hmoov yuav tsum tau muab cais tawm ntawm cov txheej txheem polymer. Qhov no tsis yog ib qho teeb meem nyob rau hauv alkaline cement mortar system, vim hais tias nws yuav saponified los ntawm alkali generated los ntawm hydration ntawm cement, thiab nyob rau tib lub sij hawm, cov adsorption ntawm quartz cov ntaub ntawv yuav maj mam cais nws los ntawm lub system tsis muaj hydrophilic tiv thaiv. Colloid, ib zaj duab xis uas yog insoluble hauv dej thiab tsim los ntawm ib zaug dispersion ntawm redispersible latex hmoov, tuaj yeem ua haujlwm tsis yog nyob rau hauv qhuav qhuav, tab sis kuj nyob rau hauv tej yam kev mob ntawm lub sij hawm mus rau immersion nyob rau hauv dej. Hauv cov tshuab uas tsis yog alkaline, xws li cov tshuab gypsum lossis cov tshuab uas tsuas muaj cov fillers, kev tiv thaiv colloids tseem yog ib feem nyob rau hauv zaj duab xis kawg polymer vim qee yam, cuam tshuam rau cov dej tsis kam ntawm zaj duab xis, tab sis vim tias cov tshuab no tsis siv rau hauv cov dej mus sij hawm ntev, thiab cov polymer tseem muaj nws cov khoom siv tshwj xeeb, nws tsis cuam tshuam rau daim ntawv thov ntawm cov hmoov polymer dispersible hauv cov tshuab no.
Lub sij hawm xa tuaj: Plaub Hlis-25-2024