Cov hmoov latex uas tawg tau dua nrog lwm cov khoom sib txuas inorganic (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 agent, thiab lwm yam) rau kev sib tov lub cev kom ua cov mortar qhuav sib xyaw. Thaum cov mortar qhuav sib xyaw ntxiv rau hauv dej thiab do, cov hmoov latex yuav tawg mus rau hauv dej nyob rau hauv qhov kev ua ntawm hydrophilic tiv thaiv colloid thiab mechanical shear. Lub sijhawm xav tau rau cov hmoov latex uas tawg tau dua kom tawg yog luv heev, thiab qhov ntsuas lub sijhawm tawg no kuj yog ib qho tseem ceeb los tshuaj xyuas nws qhov zoo. Thaum pib sib tov, cov hmoov latex twb pib cuam tshuam rau rheology thiab workability ntawm cov mortar.
Vim muaj ntau yam ntxwv thiab kev hloov kho ntawm txhua cov hmoov latex uas muab faib ua pawg, cov nyhuv no kuj txawv, qee qhov muaj cov nyhuv pab kom ntws tau, thiab qee qhov muaj cov nyhuv thixotropy ntau ntxiv. Lub tshuab ntawm nws cov nyhuv los ntawm ntau yam, suav nrog cov nyhuv ntawm cov hmoov latex rau qhov sib txuas ntawm dej thaum lub sijhawm sib kis, cov nyhuv ntawm cov viscosity sib txawv ntawm cov hmoov latex tom qab sib kis, cov nyhuv ntawm cov colloid tiv thaiv, thiab cov nyhuv ntawm cov cement thiab cov siv dej. Cov nyhuv suav nrog kev nce ntawm cov pa hauv cov mortar thiab kev faib 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 latex uas tau faib ua pawg yog ib txoj hauv kev tseem ceeb los cuam tshuam rau cov khoom zoo. Lub ntsiab lus pom ntau dua yog tias cov hmoov latex uas tau faib ua pawg feem ntau ua rau cov pa hauv cov mortar nce ntxiv, yog li ua kom cov mortar ua haujlwm tau zoo, thiab qhov sib txuas thiab viscosity ntawm cov hmoov latex, tshwj xeeb tshaj yog cov colloid tiv thaiv, rau dej thaum nws sib kis. Kev nce ntawm qhov concentration pab txhim kho kev sib koom ua ke ntawm cov mortar 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 dej ntawm peb theem - kev nqus ntawm cov txheej hauv paus, kev siv cov tshuaj cement hydration, thiab kev ua kom dej ntws mus rau saum huab cua, cov khoom siv resin maj mam mus txog, cov interfaces 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 yuav kom ua rau cov txheej txheem no tsis rov qab ua tau, uas yog, thaum cov zaj duab xis polymer ntsib dej dua, nws yuav tsis tawg dua, thiab cov colloid tiv thaiv ntawm cov hmoov latex uas rov ua dua tshiab 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 cement hydration, thiab tib lub sijhawm, kev nqus ntawm cov khoom zoo li quartz yuav maj mam cais nws ntawm lub kaw lus, tsis muaj kev tiv thaiv ntawm hydrophilicity Colloids, uas tsis yaj hauv dej thiab tsim los ntawm kev tawg ib zaug ntawm cov hmoov latex uas rov ua dua tshiab, tuaj yeem ua haujlwm tsis yog nyob rau hauv cov xwm txheej qhuav xwb, tab sis kuj nyob rau hauv cov xwm txheej dej ntev. Hauv cov txheej txheem tsis-alkaline, xws li cov txheej txheem gypsum lossis cov txheej txheem nrog tsuas yog cov khoom sau, rau qee qhov laj thawj colloid tiv thaiv tseem muaj ib feem hauv cov txheej txheem polymer kawg, uas cuam tshuam rau qhov tsis kam dej ntawm cov zaj duab xis, tab sis vim tias cov txheej txheem no tsis siv rau Hauv qhov xwm txheej ntawm kev nqus dej 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 latex uas rov ua dua tshiab hauv cov txheej txheem no.
Nrog rau kev tsim cov zaj duab xis polymer kawg, ib lub cev tsim los ntawm cov khoom siv inorganic thiab organic binders tau tsim nyob rau hauv cov mortar kho, uas yog, cov khoom siv hydraulic tsim cov qauv brittle thiab tawv, thiab cov hmoov latex redispersible tsim cov zaj duab xis ntawm qhov sib txawv thiab qhov chaw khov kho. Kev sib txuas yooj ywm. Hom kev sib txuas no tuaj yeem xav tias yog txuas nrog lub cev pob txha los ntawm ntau lub caij nplooj ntoos hlav me me. Txij li thaum lub zog tensile ntawm cov zaj duab xis polymer resin tsim los ntawm cov hmoov latex feem ntau yog qhov kev txiav txim siab ntawm qhov loj dua li ntawm cov ntaub ntawv hydraulic, lub zog ntawm cov mortar nws tus kheej tuaj yeem txhim kho, uas yog, kev sib koom ua ke tau txhim kho. Txij li thaum qhov yooj ywm thiab deformability ntawm cov polymer yog siab dua li ntawm cov qauv khov kho xws li cement, qhov deformability ntawm cov mortar tau txhim kho, thiab cov nyhuv ntawm kev ntxhov siab dispersing tau txhim kho zoo heev, yog li txhim kho qhov tawg tsis kam ntawm cov mortar.
Lub sijhawm tshaj tawm: Lub Peb Hlis-07-2023