Cov hmoov emulsion thaum kawg ua cov yeeb yaj kiab polymer, thiab cov khoom siv organic yog tsim los ntawm cov ntaub ntawv zoo nkauj, thiab ib zaj duab xis tsim los ntawm redispersible looj thiab khoom nto. Saj zawg zog network. Lub zog tensile thiab cohesion ntawm cov duab dhos polymer resin tsim los ntawm cov hmoov yas yooj yim. Vim tias qhov hloov zuj zus ntawm cov polymer, muaj peev xwm deformation muaj ntau dua li cov Maas pob zeb nruj heev, yog li txhim kho cov capt tsis kam ntawm lub cug Cov. Nrog kev nce ntawm cov ntsiab lus ntawm redispersible looj hmoov, tag nrho cov kab ke tsim rau cov yas. Nyob rau hauv cov ntaub ntawv ntawm cov ntsiab lus zoo cov ntsiab lus, cov tshuaj khib nyiab hauv cov khoom sib xyaw ua ke thiab ua ib qho kev ua haujlwm ntawm cov khoom noj muaj txiaj ntsig, thaum cov khoom siv hydration ntawm cov cement ua "muab tub lim". ".
Lub zog tensile, elasticity, yooj yim thiab feetability thiab cug hloov los ntawm redispersible looj hmoov yog txhua yam zoo dua. Kev sib xyaw ntawm redispersible looj zaj duab xis (latex zaj duab xis) los ua thiab tsim ib feem ntawm lub porosity porosity ntawm lub cug. Daim Ntawv Mooj phib xas muaj tus kheej-ncab tshuab hluav taws xob uas muaj kev tawm tsam qhov twg nws yog anchored rau lub cug. Los ntawm cov rog sab hauv, lub cug yog tswj hwm raws li tag nrho, yog li nce cov cohesive zog ntawm lub tshuaj khib. Lub xub ntiag ntawm cov hloov tau yooj yim thiab elastic polymers txhim kho qhov hloov tau yooj yim thiab elasticity ntawm lub tshuaj khib. Tus txheej txheem rau kev nce ntxiv nyob rau hauv cov kev ntxhov siab thiab tsis ua hauj lwm muaj raws li nram no: thaum muaj kev ntxhov siab tau mus txog vim muaj kev txhim kho yooj yim thiab elasticity. Tsis tas li ntawd, cov interwoven polymer domains kuj tseem tabkaum lub coalescence ntawm microcacks rau hauv cov kab nrib pleb. Yog li no, cov neeg recispersible polymer polymer hmoov txhim kho kev ntxhov siab thiab tsis ua tiav hom ntawm cov khoom.
Cov yeeb yaj kiab polymer nyob rau hauv polymer hloov cug tau muaj qhov cuam tshuam tseem ceeb rau cov cortaring tawv. Redispersible looj hmoov faib rau ntawm lub interface ua si lwm lub luag haujlwm thiab ua yeeb yaj kiab ua yeeb yam, uas yog kom nce adhesion rau cov ntaub ntawv tiv tauj. Hauv microstructure ntawm cov hmoov polymer hloov lub cug cov tshuaj khib thiab cov yeeb yaj kiab uas muaj cov kab vaph formed los ntawm cov dej veptures tsis tshua muaj pa thiab txoj cai xis. Lub chaw sib tiv tauj ntawm ob qho kev sib tiv tauj cov ntaub ntawv yog ib thaj chaw pheej hmoo ntau rau cov kev tawg rau cov kab tawg kom ua thiab ua rau ploj ntawm cohesion. Yog li ntawd, lub peev xwm ntawm cov yeeb yaj kiab latex kom zoo shrinkage cracks yog qhov tseem ceeb rau cov nplais nplaum.
Lub sij hawm ncua: Mar-06-2023