Qhuav-sib xyaw mortar yog tsim los ntawm lub cev sib xyaw redispersible latex hmoov nrog rau lwm yam inorganic adhesives thiab ntau yam aggregates, fillers thiab lwm yam additives. Thaum cov hmoov hmoov qhuav ntxiv rau hauv dej thiab nplawm, nyob rau hauv qhov kev txiav txim ntawm hydrophilic tiv thaiv colloid thiab mechanical shear force, latex hmoov hais tau sai sai dispersed rau hauv dej, uas yog txaus rau tag nrho cov redispersible latex hmoov rau hauv ib tug zaj duab xis.
Qhov sib xyaw ntawm cov hmoov latex sib txawv, uas yuav cuam tshuam rau rheology thiab ntau yam kev tsim kho ntawm mortar. Lub affinity ntawm latex hmoov rau dej thaum nws yog redispersed, sib txawv viscosities ntawm latex hmoov tom qab dispersion, lub cawv ntawm cov huab cua ntsiab lus ntawm mortar thiab tis ntawm huab cua npuas, kev sib cuam tshuam ntawm latex hmoov thiab lwm yam additives, thiab lwm yam. latex hmoov tau nce fluidity. , nce thixotropy, nce viscosity thiab lwm yam.
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 plooj, thiab maj mam sib koom ua ke, thiab thaum kawg sib sau ua zaj duab xis. 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.
Nyob rau theem thib ob, thaum cov khoom sib cuag nrog ib leeg, cov dej hauv lub network evaporates los ntawm cov hlab ntsha capillary, thiab lub siab capillary nro thov rau saum npoo ntawm cov khoom ua rau cov deformation ntawm cov latex spheres rau fuse lawv ua ke, thiab cov dej uas seem nyob puv lub pores, thiab zaj duab xis yog roughly tsim.
Qhov thib peb, theem kawg ua rau lub diffusion ntawm polymer molecules rau hauv cov yeeb yaj kiab tsis tu ncua. 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. Obviously, thiaj li yuav pab kom cov redispersible latex hmoov los ua ib zaj duab xis nyob rau hauv lub hardened mortar, nws yog ib qhov tsim nyog los xyuas kom meej tias qhov tsawg kawg nkaus zaj duab xis tsim kub yog qis dua qhov kub ntawm lub mortar. .
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. Nyob rau hauv lub mortar, nws yog los txhim kho lub brittleness, siab elastic modulus thiab lwm yam tsis muaj zog ntawm cov tsoos cement mortar, thiab muab cov cement mortar nrog zoo elasticity thiab tensile daim ntawv cog lus lub zog, thiaj li tiv thaiv thiab ncua lub tiam ntawm cement mortar tawg. Txij li thaum lub polymer thiab cov mortar tsim ib qho kev sib txuas network qauv, ib tug nruam polymer zaj duab xis yog tsim nyob rau hauv lub qhov hws, uas ntxiv dag zog rau kev sib raug zoo ntawm cov aggregates thiab blocks ib co pores nyob rau hauv lub mortar, yog li cov hloov mortar tom qab hardening yog zoo dua li cov cement mortar. Muaj kev txhim kho loj.
Post lub sij hawm: Mar-20-2023