Cov hmoov polymer uas yaj tau thiab lwm yam khoom siv tsis sib xws (xws li cement, slaked lime, 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) raug sib xyaw ua ke los ua cov mortar qhuav. Thaum cov mortar qhuav sib xyaw nrog dej, nyob rau hauv qhov kev ua ntawm hydrophilic protective colloid thiab mechanical shearing, cov hmoov latex yuav tawg mus rau hauv dej.
Vim muaj ntau yam ntxwv thiab kev hloov kho ntawm txhua cov hmoov latex uas raug faib ua pawg, cov nyhuv no kuj txawv, qee qhov muaj cov nyhuv ntawm kev txhawb nqa kev ntws, thaum qee qhov muaj cov nyhuv ntawm kev nce thixotropy. Lub tshuab ntawm nws cov kev cuam tshuam los ntawm ntau yam, suav nrog kev cuam tshuam ntawm cov hmoov latex rau qhov sib txuas ntawm dej thaum lub sijhawm tawg, kev cuam tshuam ntawm qhov sib txawv viscosity ntawm cov hmoov latex tom qab tawg, kev cuam tshuam ntawm cov colloid tiv thaiv, thiab kev cuam tshuam ntawm cov cement thiab dej siv. Kev cuam tshuam ntawm cov yam hauv qab no suav nrog kev cuam tshuam rau kev nce ntawm cov pa hauv cov mortar thiab kev faib tawm ntawm cov pa npuas, nrog rau kev cuam tshuam ntawm nws cov additives thiab kev sib cuam tshuam nrog lwm cov additives. Yog li ntawd, kev xaiv cov hmoov polymer redispersible yog ib txoj hauv kev tseem ceeb los cuam tshuam rau cov khoom zoo. Ntawm lawv, qhov kev xav ntau dua yog tias cov hmoov polymer redispersible feem ntau ua rau cov pa hauv cov mortar nce ntxiv, yog li ua rau lubrication ntawm cov mortar, thiab qhov sib txuas thiab viscosity ntawm cov hmoov polymer, tshwj xeeb tshaj yog thaum cov colloid tiv thaiv tawg, rau dej. Qhov nce ntawm α pab txhawb rau kev txhim kho ntawm kev sib koom ua ke ntawm cov mortar kev tsim kho, yog li txhim kho kev ua haujlwm ntawm cov mortar. Tom qab ntawd, cov mortar ntub uas muaj cov hmoov latex dispersion raug siv rau ntawm qhov chaw ua haujlwm. Nrog rau kev txo qis ntawm cov dej noo ntawm peb theem - kev nqus ntawm cov txheej hauv paus, kev noj ntawm cov tshuaj tiv thaiv cement hydration, thiab kev ua kom cov dej noo ntawm qhov chaw mus rau hauv huab cua, cov khoom siv resin maj mam mus txog qhov, qhov interface maj mam sib koom ua ke, thiab thaum kawg ua ib zaj duab xis polymer tas mus li. Cov txheej txheem no feem ntau tshwm sim hauv cov qhov hws ntawm cov mortar thiab qhov chaw ntawm cov khoom khov.
Yuav tsum tau hais meej tias, txhawm rau ua kom cov txheej txheem no tsis rov qab ua haujlwm tau, uas yog, thaum cov zaj duab xis polymer tsis rov tawg dua thaum nws ntsib dej dua, cov colloid tiv thaiv ntawm cov hmoov polymer rov tawg dua yuav tsum tau sib cais ntawm cov txheej txheem zaj duab xis polymer. Qhov no tsis yog teeb meem hauv cov txheej txheem alkaline cement mortar, vim tias nws yuav raug saponified los ntawm alkali tsim los ntawm kev ua kom cov cement noo, thiab tib lub sijhawm, kev nqus ntawm cov ntaub ntawv quartz yuav maj mam cais nws ntawm lub kaw lus yam tsis muaj kev tiv thaiv hydrophilic. Colloid, ib zaj duab xis uas tsis yaj hauv dej thiab tsim los ntawm kev sib cais ib zaug ntawm cov hmoov latex rov tawg dua, tuaj yeem ua haujlwm tsis yog nyob rau hauv cov xwm txheej qhuav, tab sis kuj nyob rau hauv cov xwm txheej ntawm kev immersion ntev hauv dej. Hauv cov txheej txheem tsis-alkaline, xws li cov txheej txheem gypsum lossis cov txheej txheem nrog tsuas yog cov khoom sau, cov colloids tiv thaiv tseem muaj ib feem nyob rau hauv cov txheej txheem polymer kawg rau qee qhov laj thawj, cuam tshuam rau qhov tsis kam dej ntawm cov zaj duab xis, tab sis txij li cov txheej txheem no tsis siv rau Hauv qhov xwm txheej ntawm kev immersion ntev hauv dej, thiab cov polymer tseem muaj nws cov khoom siv kho tshuab tshwj xeeb, nws tsis cuam tshuam rau kev siv cov hmoov polymer dispersible hauv cov txheej txheem no.
Lub sijhawm tshaj tawm: Plaub Hlis-25-2024