Sai li cov khoom siv cement-based ntxiv nrog latex hmoov hu rau dej, cov tshuaj tiv thaiv hydration pib, thiab cov tshuaj calcium hydroxide sai sai mus txog saturation thiab crystals yog precipitated, thiab tib lub sij hawm, ettringite crystals thiab calcium silicate hydrate gels yog tsim.Cov khoom siv tau muab tso rau ntawm cov gel thiab cov cement uas tsis muaj dej.Raws li cov tshuaj tiv thaiv hydration tshwm sim, cov khoom hydration nce, thiab cov khoom siv polymer maj mam sib sau ua ke hauv cov pores capillary, tsim cov txheej txheem ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom cov khoom siv cov khoom siv hydration tau nce zuj zus, thiab cov khoom siv polymers maj mam sib sau ua ke hauv cov pores capillary.
Lub aggregated polymer hais maj mam sau lub pores, tab sis tsis tag rau sab hauv ntawm lub pores.Raws li cov dej tau txo qis los ntawm hydration los yog ziab, cov khoom sib xyaw ua ke ntawm cov gel thiab hauv cov pores coalesce mus rau hauv cov yeeb yaj kiab tas mus li, ua ib qho sib xyaw sib xyaw nrog cov hydrated cement paste thiab txhim kho hydration Bonding ntawm cov khoom thiab aggregates.Vim hais tias cov khoom hydration nrog polymers tsim ib txheej txheej ntawm lub interface, nws yuav cuam tshuam rau kev loj hlob ntawm ettringite thiab ntxhib calcium hydroxide crystals;thiab vim hais tias cov polymers condense mus rau hauv cov yeeb yaj duab nyob rau hauv lub pores ntawm lub interface hloov chaw, cov ntaub ntawv polymer cement-raws li txoj kev hloov chaw yog denser.Cov pab pawg nquag hauv qee cov polymer molecules tseem yuav tsim cov kev sib txuas sib txuas nrog Ca2+ thiab A13+ hauv cov khoom siv cement hydration los tsim cov kev sib txuas tshwj xeeb, txhim kho lub cev ntawm cov khoom siv cement-based hardened, txo cov kev ntxhov siab sab hauv, thiab txo cov tiam ntawm microcracks.Raws li cov cement gel qauv tsim, cov dej tau noj thiab cov khoom polymer yog maj mam kaw hauv qhov pores.Raws li cov cement yog ntxiv hydrated, cov dej noo nyob rau hauv capillary pores txo, thiab cov polymer hais aggregate nyob rau saum npoo ntawm cov cement hydration khoom gel / unhydrated cement particle sib tov thiab cov aggregate, yog li tsim ib tug nruam kaw-packed txheej nrog loj pores puv. nrog nplaum los yog nws tus kheej-adhesive polymer hais.
Lub luag hauj lwm ntawm redispersible latex hmoov nyob rau hauv mortar yog tswj los ntawm ob txheej txheem ntawm cement hydration thiab polymer zaj duab xis tsim.Kev tsim cov txheej txheem sib xyaw ntawm cov cement hydration thiab polymer zaj duab xis tsim yog ua tiav hauv 4 kauj ruam:
(1) Tom qab redispersible latex hmoov yog tov nrog cement mortar, nws yog tusyees dispersed nyob rau hauv lub system;
(2) Cov khoom polymer yog tso rau saum npoo ntawm cov cement hydration khoom gel / unhydrated cement particle sib tov;
(3) Cov khoom siv polymer ua ib txheej txuas ntxiv thiab sib sau ua ke;
(4) Thaum lub sij hawm cov cement hydration txheej txheem, cov khoom sib txuas sib txuas ua ke rau hauv cov yeeb yaj kiab tas mus li, sib txuas cov khoom siv dej ua ke los tsim cov qauv kev sib txuas ua tiav.
Lub dispersed emulsion ntawm redispersible latex hmoov tuaj yeem tsim cov dej-insoluble nruam zaj duab xis (polymer network lub cev) tom qab ziab, thiab qhov qis elastic modulus polymer network lub cev tuaj yeem txhim kho kev ua haujlwm ntawm cov cement;Nyob rau tib lub sij hawm, nyob rau hauv lub polymer molecule Tej pawg polar nyob rau hauv cov cement reacts chemically nrog cov cement hydration khoom los tsim tshwj xeeb txuas hniav, txhim kho lub cev qauv ntawm cov cement hydration khoom, thiab alleviate thiab txo cov tiam ntawm cov kab nrib pleb.Tom qab ntxiv cov hmoov latex redispersible, qhov pib hydration ntawm cov cement qeeb qeeb, thiab cov yeeb yaj kiab polymer tuaj yeem qhwv ib nrab los yog tag nrho cov cement, kom cov cement tuaj yeem ua kom muaj dej txaus thiab nws cov khoom muaj zog tuaj yeem txhim kho.
Redispersible latex hmoov plays lub luag haujlwm tseem ceeb ua ib qho ntxiv rau kev tsim mortar.Ntxiv cov hmoov latex ntxiv rau hauv cov mortar tuaj yeem npaj ntau yam khoom siv tshuaj xws li pobzeb nplaum, thermal rwb thaiv tsev mortar, self-leveling mortar, putty, plastering mortar, decorative mortar, jointing agent, kho mortar thiab waterproof sealing khoom, thiab lwm yam. kev ua haujlwm ntawm kev tsim kho mortar.Ntawm chav kawm, muaj teeb meem adaptability ntawm redispersible latex hmoov thiab cement, admixtures thiab admixtures, uas yuav tsum tau muab txaus mloog nyob rau hauv tej daim ntaub ntawv.
Post lub sij hawm: Mar-14-2023