Thaum cov khoom siv cement uas ntxiv nrog cov hmoov latex kov dej, qhov kev ua kom dej noo pib, thiab cov tshuaj calcium hydroxide sai sai mus txog qhov saturation thiab cov siv lead ua rau precipitate, thiab tib lub sijhawm, cov siv lead ua ettringite thiab cov gels calcium silicate hydrate raug tsim. Cov khoom khov kho tau tso rau ntawm cov gel thiab cov khoom siv cement tsis muaj dej. Thaum qhov kev ua kom dej noo mus ntxiv, cov khoom siv hydration nce ntxiv, thiab cov khoom polymer maj mam sib sau ua ke hauv cov qhov capillary, tsim ib txheej ntim ntom ntom ntawm qhov chaw ntawm cov gel thiab ntawm cov khoom siv cement tsis muaj dej.
Cov khoom me me polymer uas tau sib sau ua ke maj mam sau cov qhov hws, tab sis tsis yog tag nrho rau sab hauv ntawm cov qhov hws. Thaum dej raug txo ntxiv los ntawm kev ua kom noo lossis ziab, cov khoom me me polymer uas tau ntim ze rau ntawm cov gel thiab hauv cov qhov hws sib sau ua ke rau hauv ib zaj duab xis txuas ntxiv, tsim cov khoom sib xyaw nrog cov tshuaj nplaum hydrated cement thiab txhim kho kev sib txuas ntawm cov khoom thiab cov khoom sib sau ua ke. Vim tias cov khoom hydration nrog cov polymers tsim ib txheej npog ntawm qhov sib tshuam, nws yuav cuam tshuam rau kev loj hlob ntawm ettringite thiab cov siv lead ua los ntawm calcium hydroxide; thiab vim tias cov polymers condense rau hauv cov yeeb yaj kiab hauv cov qhov hws ntawm thaj chaw hloov pauv interface, cov khoom siv polymer cement thaj chaw hloov pauv yog denser. Cov pab pawg nquag hauv qee cov polymer molecules kuj tseem yuav tsim cov tshuaj sib txuas nrog Ca2 + thiab A13 + hauv cov khoom siv cement hydration los tsim cov choj sib txuas tshwj xeeb, txhim kho cov qauv ntawm cov khoom siv cement uas tau tawv, txo kev ntxhov siab sab hauv, thiab txo cov kab nrib pleb me me. Thaum cov qauv cement gel tsim, cov dej raug noj thiab cov khoom me me polymer maj mam kaw hauv cov qhov hws. Thaum cov cement raug hydrated ntxiv, cov dej noo hauv cov qhov capillary txo qis, thiab cov polymer particles sib sau ua ke ntawm qhov chaw ntawm cov cement hydration product gel / unhydrated cement particle sib tov thiab cov aggregate, yog li tsim cov txheej txheem kaw-ntim nrog cov qhov loj Puv nrog cov khoom polymer nplaum lossis tus kheej nplaum.
Lub luag haujlwm ntawm cov hmoov latex uas tawg tau dua hauv cov mortar yog tswj los ntawm ob txoj kev ntawm kev ua kom cov cement hydration thiab kev tsim cov zaj duab xis polymer. Kev tsim cov txheej txheem sib xyaw ntawm cov cement hydration thiab kev tsim cov zaj duab xis polymer yog ua tiav hauv 4 kauj ruam:
(1) Tom qab cov hmoov latex uas rov tawg tau sib xyaw nrog cov cement mortar, nws tau sib kis thoob plaws hauv lub kaw lus;
(2) Cov khoom me me polymer tau muab tso rau ntawm qhov chaw ntawm cov khoom sib xyaw ua ke ntawm cov cement hydration gel / cov khoom sib xyaw ua ke ntawm cov cement tsis muaj dej;
(3) Cov khoom polymer tsim ib txheej sib txuas thiab sib dhos ua ke;
(4) Thaum lub sijhawm ua cov cement hydration, cov khoom polymer uas tau ntim ze ze sib sau ua ke rau hauv ib zaj duab xis txuas ntxiv, txuas cov khoom hydration ua ke los tsim cov qauv network tiav.
Cov emulsion uas tawg ua tej daim me me ntawm cov hmoov latex uas tau tawg ua tej daim me me tom qab ziab tuaj yeem tsim cov zaj duab xis uas tsis yaj hauv dej (polymer network body) tom qab ziab, thiab cov polymer network modulus uas tsis tshua muaj elastic no tuaj yeem txhim kho kev ua tau zoo ntawm cov cement; tib lub sijhawm, hauv cov polymer molecule Qee pawg polar hauv cov cement teb nrog cov khoom cement hydration los tsim cov choj tshwj xeeb, txhim kho cov qauv ntawm cov khoom cement hydration, thiab txo qhov tshwm sim ntawm cov kab nrib pleb. Tom qab ntxiv cov hmoov latex uas tawg ua tej daim me me, qhov pib ntawm cov cement qeeb qeeb, thiab cov zaj duab xis polymer tuaj yeem qhwv cov cement ib feem lossis tag nrho, yog li cov cement tuaj yeem hydrated tag nrho thiab nws cov khoom sib txawv tuaj yeem txhim kho.
Cov hmoov latex uas yaj tau dua ua lub luag haujlwm tseem ceeb ua cov khoom ntxiv rau cov tshuaj mortar hauv kev tsim kho. Kev ntxiv cov hmoov latex uas yaj tau dua rau hauv cov tshuaj mortar tuaj yeem npaj ntau yam khoom siv mortar xws li cov nplaum pobzeb, cov tshuaj mortar rwb thaiv tsev, cov tshuaj mortar uas nws tus kheej leveling, putty, cov tshuaj mortar plastering, cov tshuaj mortar kho kom zoo nkauj, cov tshuaj sib koom ua ke, cov tshuaj mortar kho thiab cov khoom siv sealing dej, thiab lwm yam. Qhov ntau thiab tsawg ntawm kev siv thiab kev ua tau zoo ntawm cov tshuaj mortar hauv kev tsim kho. Tau kawg, muaj teeb meem kev hloov pauv ntawm cov hmoov latex uas yaj tau dua thiab cov cement, cov khoom sib xyaw thiab cov khoom sib xyaw, uas yuav tsum tau muab kev saib xyuas txaus rau hauv cov ntawv thov tshwj xeeb.
Lub sijhawm tshaj tawm: Lub Peb Hlis-14-2023