Lub affinity ntawm latex hmoov rau dej thaum nws yog redispersed, qhov sib txawv viscosities ntawm latex hmoov tom qab dispersion, lub zog ntawm cov huab cua ntsiab lus ntawm mortar thiab tis ntawm huab cua npuas, kev sib cuam tshuam ntawm roj hmab hmoov thiab lwm yam additives, thiab lwm yam. latex hmoov tau nce fluidity. , nce thixotropy, nce viscosity thiab lwm yam.
Txhim kho kev ua haujlwm
Nws feem ntau ntseeg tau tias cov hmoov latex redispersible txhim kho kev ua haujlwm ntawm cov mortar tshiab: cov hmoov latex, tshwj xeeb tshaj yog cov tshuaj tiv thaiv colloid, muaj affinity rau dej thiab tsub kom lub viscosity ntawm slurry thiab txhim kho cov cohesion ntawm kev tsim mortar. Tom qab cov tshuaj sib xyaw tshiab uas muaj cov latex hmoov dispersion yog tsim, nrog rau kev nqus dej los ntawm lub hauv paus nto, kev noj cov tshuaj tiv thaiv hydration, thiab cov volatilization rau saum huab cua, cov dej yuav maj mam txo, cov khoom yuav maj mam mus, lub interface yuav maj mam ua plooj, thiab lawv yuav maj mam sib koom ua ke thiab thaum kawg sib sau ua ke. zaj duab xis tsim. Cov txheej txheem ntawm kev tsim cov yeeb yaj kiab polymer tau muab faib ua peb theem. Nyob rau hauv thawj theem, cov polymer hais txav dawb do nyob rau hauv daim ntawv ntawm Brownian motion nyob rau hauv thawj emulsion. Raws li cov dej evaporates, kev txav ntawm cov khoom yog ib txwm muaj kev txwv ntau dua, thiab qhov sib cuam tshuam ntawm cov dej thiab huab cua ua rau lawv maj mam ua ke. Hauv theem ob, thaum cov khoom pib sib cuag, cov dej hauv lub network evaporates los ntawm capillary, thiab siab capillary nro thov rau saum npoo ntawm cov khoom ua rau deformation ntawm cov latex spheres rau fuse lawv ua ke, cov dej uas tshuav nyob puv lub pores, thiab zaj duab xis yog roughly tsim. Qhov thib peb, theem kawg tso cai rau qhov diffusion (qee zaum hu ua nws tus kheej-adhesion) ntawm cov polymer molecules los ua ib zaj duab xis txuas ntxiv. Thaum lub sij hawm tsim cov yeeb yaj kiab, cov xov tooj ntawm tes latex sib cais sib sau ua ke rau hauv cov yeeb yaj kiab tshiab nrog kev ntxhov siab tensile siab. Pom tseeb, txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhuam cov hmoov av yuav tsum tau ua
Ua kom cov khoom siv zog
Nrog rau qhov kawg tsim ntawm cov zaj duab xis polymer, ib tug system uas muaj inorganic thiab organic binder lug, uas yog, ib tug nkig thiab tawv skeleton tsim los ntawm hydraulic cov ntaub ntawv, thiab ib tug zaj duab xis tsim los ntawm redispersible latex hmoov nyob rau hauv lub qhov khoob thiab cov khoom nto yog tsim nyob rau hauv lub kho mortar. hloov tau yooj yim network. Lub zog tensile thiab cohesion ntawm polymer resin zaj duab xis tsim los ntawm latex hmoov yog txhim kho. Vim lub elasticity ntawm cov polymer, lub peev xwm deformation yog ntau dua li cov cement pob zeb nruj qauv, qhov deformation kev ua tau zoo ntawm cov mortar yog txhim kho, thiab cov nyhuv ntawm dispersing kev nyuaj siab yog heev txhim kho, yog li txhim kho qhov tawg tsis kam ntawm mortar. . Nrog rau qhov nce ntawm cov ntsiab lus ntawm redispersible latex hmoov, tag nrho cov txheej txheem tsim los ntawm yas. Nyob rau hauv cov ntaub ntawv ntawm high latex hmoov cov ntsiab lus, lub polymer theem nyob rau hauv lub kho mortar maj mam tshaj lub inorganic hydration khoom theem, thiab lub mortar yuav hloov mus rau qhov zoo thiab ua ib tug elastomer, thaum lub hydration khoom ntawm cement yuav ua ib tug "filler". ". Lub zog tensile, elasticity, saj zawg zog thiab sealability ntawm mortar hloov los ntawm redispersible latex hmoov yog tag nrho cov txhim kho. Kev sib xyaw ntawm cov kua roj hmab redispersible tso cai rau cov yeeb yaj kiab polymer (latex zaj duab xis) tsim thiab tsim ib feem ntawm phab ntsa pore, yog li sealing lub siab porosity qauv ntawm lub mortar. Lub latex membrane muaj ib tug self-stretching mechanism uas exerts nro qhov twg nws yog anched rau lub mortar. Los ntawm cov zog sab hauv, cov tshuaj khib nyiab yog khaws cia tag nrho, yog li ua kom lub zog cohesive ntawm lub mortar. Lub xub ntiag ntawm cov khoom siv tau yooj yim thiab cov khoom siv elastic zoo txhim kho qhov yooj thiab elasticity ntawm cov tshuaj khib nyiab. Cov txheej txheem rau kev nce hauv kev ntxhov siab thiab tsis ua haujlwm lub zog yog raws li hauv qab no: thaum siv lub zog, microcracks ncua sij hawm kom txog thaum muaj kev ntxhov siab ntau dua vim kev txhim kho yooj thiab elasticity. Tsis tas li ntawd, cov interwoven polymer domains tseem cuam tshuam cov coalescence ntawm microcracks rau hauv cov kab nrib pleb. Yog li ntawd, cov respersible polymer hmoov txhim kho qhov tsis ua hauj lwm kev nyuaj siab thiab tsis ua hauj lwm strain ntawm cov khoom.
Post lub sij hawm: Mar-09-2023