Cellulose ethers (HEC, HPMC, MC, thiab lwm yam) thiab redispersible polymer hmoov (feem ntau raws li VAE, acrylates, thiab lwm yam)yog ob qho tseem ceeb additives nyob rau hauv mortars, tshwj xeeb tshaj yog qhuav-mix mortars. Lawv txhua tus muaj cov haujlwm tshwj xeeb, thiab dhau los ntawm cov txiaj ntsig zoo sib xyaw ua ke, lawv ua kom muaj txiaj ntsig tag nrho ntawm cov tshuaj khib nyiab. Lawv qhov kev sib cuam tshuam feem ntau tshwm sim hauv cov hauv qab no:
Cellulose ethers muab qhov chaw tseem ceeb (dej tuav thiab thickening):
Kev tuav dej: Qhov no yog ib qho ntawm cov haujlwm tseem ceeb ntawm cellulose ether. Nws tuaj yeem tsim cov yeeb yaj kiab hydration ntawm cov khoom khib nyiab thiab dej, txo qis tus nqi ntawm cov dej evaporation mus rau lub substrate (xws li porous bricks thiab blocks) thiab huab cua.
Kev cuam tshuam rau redispersible polymer hmoov: Qhov kev tuav dej zoo heev no tsim cov xwm txheej tseem ceeb rau cov hmoov respersible polymer kom ua haujlwm:
Muab lub sijhawm ua zaj duab xis: cov hmoov polymer hmoov yuav tsum tau yaj hauv dej thiab rov ua dua rau hauv emulsion. Cov hmoov polymer ces coalesces mus rau hauv ib qho txuas ntxiv, hloov tau yooj yim polymer zaj duab xis raws li cov dej maj mam evaporates thaum lub sij hawm mortar qhuav. Cellulose ether slows dej evaporation, muab cov polymer hmoov particles lub sij hawm txaus (qhib lub sij hawm) kom tusyees disperse thiab migrate mus rau hauv mortar pores thiab interfaces, thaum kawg tsim ib tug zoo, ua tiav polymer zaj duab xis. Yog tias cov dej poob sai dhau lawm, cov hmoov polymer yuav tsis ua kom tiav cov yeeb yaj kiab lossis cov yeeb yaj kiab yuav tsum tsis tu ncua, txo nws txoj kev txhawb zog.
Xyuas kom Cement Hydration: Cement hydration yuav tsum tau dej.Cov dej-retention propertiesntawm cellulose ether xyuas kom meej tias thaum lub polymer hmoov tsim cov zaj duab xis, cov cement kuj tau txais cov dej txaus kom muaj dej txaus, yog li tsim lub hauv paus zoo rau thaum ntxov thiab lig zog. Lub zog tsim los ntawm cov cement hydration ua ke nrog qhov yooj yim ntawm cov yeeb yaj kiab polymer yog lub hauv paus rau kev txhim kho kev ua haujlwm.
Cellulose ether txhim kho kev ua haujlwm (thickening thiab cua nkag):
Thickening / Thixotropy: Cellulose ethers ho nce qhov sib xws thiab thixotropy ntawm mortars (tuab thaum tseem, thinning thaum nplawm / siv). Qhov no txhim kho cov mortar tsis kam rau sag (slipping down ntsug nto), ua kom yooj yim rau kis thiab theem, ua rau kom tiav zoo dua.
Huab cua entraining nyhuv: Cellulose ether muaj qee yam huab cua entraining muaj peev xwm, qhia me me, zoo ib yam thiab ruaj khov npuas.
Kev cuam tshuam rau cov hmoov polymer:
Txhim kho dispersion: Tsim nyog viscosity pab latex hmoov hais disperse ntau tusyees nyob rau hauv lub mortar system thaum sib tov thiab txo agglomeration.
Optimized workability: Cov khoom siv zoo thiab thixotropy ua rau cov tshuaj khib nyiab uas muaj cov hmoov latex yooj yim rau kev ua haujlwm, kom ntseeg tau tias nws yog qhov sib npaug ntawm cov substrate, uas yog qhov tseem ceeb rau kev sib koom ua ke ntawm cov hmoov latex ntawm lub interface.
Lubrication thiab cushioning los ntawm huab cua npuas: Cov cua npuas tau qhia ua raws li cov pob bearings, ntxiv txhim kho lubricity thiab workability ntawm lub mortar. Nyob rau tib lub sijhawm, cov microbubbles tsis muaj kev ntxhov siab nyob rau hauv cov tshuaj khib nyiab, ua kom cov nyhuv toughening ntawm cov hmoov latex (txawm tias huab cua ntau dhau tuaj yeem txo lub zog, yog li yuav tsum muaj qhov sib npaug).
Redispersible polymer hmoov muab kev sib txuas yooj yim thiab kev txhawb zog (zaj duab xis tsim thiab kev sib txuas):
Tsim cov zaj duab xis polymer: Raws li tau hais ua ntej, thaum lub sij hawm ziab ntawm cov mortar, cov latex hmoov particles aggregate mus rau hauv ib tug nruam peb-dimensional polymer network zaj duab xis.
Kev cuam tshuam rau mortar matrix:
Txhim khu kev sib koom ua ke: Cov yeeb yaj kiab polymer qhwv thiab txuas cov khoom siv cement hydration, unhydrated cement particles, fillers thiab aggregates, ua kom muaj zog sib koom ua ke (cohesion) ntawm cov khoom hauv lub mortar.
Txhim kho kev yooj yim thiab tawg tsis kam: Cov zaj duab xis polymer yog qhov hloov tau yooj yim thiab zawm, muab cov tshuaj khib nyiab ntau dua deformation muaj peev xwm. Qhov no ua rau cov mortar kom zoo dua nqus thiab faib cov kev ntxhov siab los ntawm qhov kub thiab txias, kev hloov pauv ntawm cov av noo, lossis kev hloov pauv me ntsis ntawm cov substrate, txo qhov kev pheej hmoo ntawm kev tawg (cracking resistance).
Txhim kho qhov cuam tshuam thiab hnav tsis kam: Cov yeeb yaj kiab polymer hloov tau tuaj yeem nqus lub zog thiab txhim kho qhov cuam tshuam thiab hnav tsis kam ntawm cov tshuaj khib nyiab.
Txo cov elastic modulus: ua rau cov mortar softer thiab adaptable rau deformation ntawm lub substrate.
Latex hmoov txhim kho interfacial bonding (interface li):
Ntxiv rau thaj chaw nquag ntawm cellulose ethers: Cov dej tuav cov nyhuv ntawm cellulose ethers kuj txo qhov teeb meem ntawm "interfacial water shortage" los ntawm kev nqus dej ntau dhau los ntawm cov substrate. Qhov tseem ceeb tshaj, cov hmoov polymer hmoov / emulsions muaj lub siab xav mus rau hauv lub mortar-substrate interface thiab mortar-reinforcement fiber (yog tias muaj) interface.
Tsim cov txheej txheem muaj zog: Cov yeeb yaj kiab polymer tsim ntawm qhov sib cuam tshuam tau nkag mus rau hauv lub substrate micropores (lub cev sib txuas). Nyob rau tib lub sijhawm, lub polymer nws tus kheej nthuav tawm cov adhesion zoo heev (tshuaj lom neeg / lub cev adsorption) rau ntau yam substrates (pob zeb, cib, ntoo, EPS / XPS rwb thaiv tsev boards, thiab lwm yam). Qhov no ua rau cov tshuaj khib nyiab lub zog (adhesion) rau ntau lub substrates, ob qho tib si thaum pib thiab tom qab immersion hauv dej thiab khov-thaw mus (dej tsis kam thiab huab cua tsis kam).
Synergistic optimization ntawm pore qauv thiab durability:
Cov teebmeem ntawm cellulose ether: Dej tuav optimizes cement hydration thiab txo cov pores los ntawm dej tsis txaus; huab cua entraining nyhuv qhia txog kev tswj tau me me pores.
Cov nyhuv ntawm cov hmoov polymer: cov ntaub ntawv polymer ib feem thaiv los yog txuas cov hlab ntsha capillary, ua rau lub pore qauv me me thiab tsis txuas nrog.
Synergistic Effect: Qhov sib xyaw ua ke ntawm ob yam no txhim kho cov tshuaj khib nyiab lub pore, txo cov dej nqus thiab ua kom nws cov impermeability. Qhov no tsis yog tsuas yog txhim khu lub mortar lub durability (khov-thaw kuj thiab ntsev corrosion kuj), tab sis kuj yuav txo tau cov efflorescence vim txo dej nqus. Qhov kev txhim kho pore qauv no kuj cuam tshuam nrog lub zog ntau dua.
Cellulose ether yog ob qho tib si "lub hauv paus" thiab "guarantee": nws muab qhov tsim nyog dej-tsim ib puag ncig (ua kom cov cement hydration thiab latex hmoov zaj duab xis tsim), optimizes workability (txheej txheem mortar tso), thiab cuam tshuam lub microstructure los ntawm thickening thiab cua nkag.
Redispersible latex hmoov yog ob qho tib si "txhim kho" thiab "choj": nws tsim ib zaj duab xis polymer nyob rau hauv cov xwm txheej zoo tsim los ntawm cellulose ether, txhim kho cov mortar cohesion, saj zawg zog, tawg tsis kam, daim ntawv cog lus lub zog, thiab durability.
Core synergy: Lub peev xwm khaws dej ntawm cellulose ether yog qhov yuav tsum tau ua ua ntej rau kev tsim cov yeeb yaj kiab zoo ntawm latex hmoov. Yog tias tsis muaj dej tuav txaus, latex hmoov tsis tuaj yeem ua haujlwm tag nrho. Hloov pauv, kev sib txuas yooj yim ntawm cov hmoov latex offsets lub brittleness, tawg, thiab tsis txaus adhesion ntawm ntshiab cement-raws li cov ntaub ntawv, ho txhim kho durability.
Kev sib xyaw ua ke: Ob qho kev txhim kho ib leeg hauv kev txhim kho qhov pore qauv, txo cov dej nqus dej, thiab txhim kho lub sijhawm ntev, ua rau muaj kev sib koom ua ke. Yog li ntawd, nyob rau hauv niaj hnub mortars (xws li pobzeb adhesives, sab nrauv rwb thaiv tsev plaster / bonding mortars, self-leveling mortars, waterproof mortars, thiab hniav mortars), cellulose ethers thiab redispersible polymer hmoov yuav luag ib txwm siv nyob rau hauv khub. Los ntawm kev hloov kho hom thiab ntau npaum li cas ntawm txhua qhov, cov khoom siv khib nyiab zoo tuaj yeem tsim los ua kom tau raws li kev ua tau zoo sib txawv. Lawv cov txiaj ntsig kev sib koom ua ke yog tus yuam sij rau kev txhim kho cov tsoos mortars rau hauv kev ua haujlwm siab polymer-hloov cementitious composites.
Post lub sij hawm: Aug-06-2025