Cov hmoov polymer uas yaj tau dua tshiabthiab lwm yam inorganic adhesives (xws li cement, slaked lime, gypsum, av nplaum, thiab lwm yam) thiab ntau yam aggregates, fillers thiab lwm yam additives (xws li cellulose, starch ether, ntoo fiber, thiab lwm yam) yog sib xyaw ua ke los ua cov mortar qhuav. Thaum cov mortar qhuav ntxiv rau hauv dej thiab do, nyob rau hauv qhov kev ua ntawm hydrophilic tiv thaiv colloid thiab mechanical shear force, cov hmoov latex hmoov me me tuaj yeem tawg sai sai rau hauv dej, uas txaus los ua tag nrho cov hmoov polymer redispersible rau hauv ib zaj duab xis. Cov khoom sib xyaw ntawm cov hmoov polymer redispersible muaj cov teebmeem sib txawv ntawm cov khoom rheological ntawm cov mortar thiab ntau yam khoom siv hauv kev tsim kho: qhov sib raug zoo ntawm cov hmoov latex rau dej thaum nws rov dispersed, qhov sib txawv viscosities ntawm cov hmoov latex tom qab dispersion, qhov cuam tshuam rau cov pa hauv cov mortar thiab kev faib tawm ntawm cov pa npuas, Kev sib cuam tshuam ntawm cov hmoov latex thiab lwm yam additives ua rau cov hmoov latex sib txawv muaj cov teebmeem ntawm kev nce fluidity, nce thixotropy, thiab nce viscosity.
Qhov sib txuas ntawm cov hmoov latex thiab cov colloid tiv thaiv rau dej thaum tawg ua rau cov slurry viscosity nce thiab txhim kho qhov sib koom ua ke ntawm cov mortar tsim kho. Tom qab cov mortar sib xyaw tshiab uas muaj cov hmoov tawg dua tshiab tau tsim, nrog rau kev nqus dej los ntawm qhov chaw hauv paus, kev noj cov tshuaj tiv thaiv hydration, thiab kev ua kom huab cua volatilization, dej yuav maj mam txo qis, cov khoom me me yuav maj mam los ze, qhov interface yuav maj mam blur, thiab maj mam sib koom ua ke, thiab thaum kawg ua cov zaj duab xis sib sau ua ke.
Nrog rau qhov kawg ntawm cov zaj duab xis polymer, ib lub kaw lus uas muaj cov qauv inorganic thiab organic binder tau tsim nyob rau hauv cov mortar kho, uas yog, ib lub pob txha brittle thiab tawv uas muaj cov ntaub ntawv hydraulic, thiab ib zaj duab xis uas tsim los ntawm cov hmoov latex redispersible hauv qhov sib txawv thiab qhov chaw khov kho. Lub network ywj pheej. Lub zog tensile thiab cohesion ntawm cov zaj duab xis polymer uas tsim los ntawm cov hmoov latex tau txhim kho. Vim yog qhov yooj ywm ntawm cov polymer, lub peev xwm deformation siab dua li ntawm cov qauv pob zeb cement, qhov kev ua tau zoo ntawm cov mortar tau txhim kho, thiab cov nyhuv ntawm kev tawg kev ntxhov siab tau txhim kho zoo heev, yog li txhim kho qhov tawg tsis kam ntawm cov mortar.
Tom qab kho, cov polymer theem hauv cov mortar maj mam ntau dua li cov khoom inorganic hydration theem, ua rau cov mortar hloov pauv zoo, ua elastomer. Tib lub sijhawm, cov khoom cement hydration ua "filler." Kev hloov kho nrog cov hmoov polymer redispersible txhim kho lub zog tensile, elasticity, flexibility, thiab sealing zog. Kev ntxiv cov hmoov polymer redispersible tsim ib daim nyias nyias polymer (latex zaj duab xis) uas yog ib feem ntawm cov phab ntsa pore, kaw cov mortar lub porous qauv. Cov zaj duab xis latex qhia txog lub tshuab ncab nws tus kheej, ua rau muaj kev nruj ntawm nws cov ntsiab lus anchoring nrog cov mortar. Cov zog sab hauv no tswj cov mortar ua ib chav tsev, txhim kho nws lub zog sib koom ua ke. Qhov muaj cov polymers yooj ywm thiab elasticity txhim kho cov mortar qhov yooj ywm thiab elasticity. Lub tshuab ntawm kev nce kev ntxhov siab thiab kev ua tsis tiav yog raws li nram no: Thaum siv lub zog, qhov kev hloov pauv thiab elasticity zoo dua qeeb qhov tsim ntawm microcracks kom txog thaum muaj kev ntxhov siab ntau dua. Ntxiv mus, cov polymer domains interwoven cuam tshuam kev sib koom ua ke ntawm microcracks rau hauv cov kab nrib pleb. Yog li ntawd, cov hmoov polymer redispersible ua rau cov khoom siv kev ntxhov siab thiab kev ua tsis tiav ntau ntxiv.
Cov zaj duab xis polymer hauv cov polymer-modified mortar ua lub luag haujlwm tseem ceeb hauv kev ua kom cov mortar tawv.hmoov latex uas yaj tau dua tshiabfaib tawm ntawm qhov sib txuas, los ntawm kev sib kis thiab kev tsim zaj duab xis, ua lub luag haujlwm tseem ceeb: txhim kho kev nplaum rau cov ntaub ntawv sib cuag. Hauv qhov microstructure ntawm qhov sib txuas ntawm cov hmoov polymer-hloov kho cov vuas nplaum thiab cov vuas, zaj duab xis polymer tsim ib lub choj ntawm cov vuas vitrified uas nqus dej tsawg heev thiab cov cement mortar matrix. Thaj chaw sib cuag ntawm ob yam khoom sib txawv yog thaj chaw muaj kev pheej hmoo siab rau kev tsim cov kab nrib pleb thiab ua rau poob kev nplaum. Yog li ntawd, zaj duab xis latex lub peev xwm los kho cov kab nrib pleb ua lub luag haujlwm tseem ceeb hauv cov nplaum vuas.
Lub sijhawm tshaj tawm: Lub Yim Hli-28-2025