Monga zomatira zazikulu za putty, kuchuluka kwa redispersible latex powder kumakhudza mphamvu yomangirira ya putty.Figure 1 ikuwonetsa mgwirizano pakati pa kuchuluka kwa ufa wa latex wopangidwanso ndi mphamvu ya mgwirizano. kuchuluka kwa re-dispersible latex ufa, chomangira mphamvu pang'onopang'ono chinawonjezeka. Pamene kuchuluka kwa ufa wa latex ndi kochepa, mphamvu yogwirizanitsa imawonjezeka ndi kuwonjezeka kwa kuchuluka kwa ufa wa latex. Ngati mlingo wa emulsion ufa ndi 2% , mphamvu ya mgwirizano imafika ku 0182MPA, yomwe imagwirizana ndi dziko lonse la 0160MPA. Chifukwa chake ndi chakuti hydrophilic latex ufa ndi gawo lamadzimadzi la kuyimitsidwa kwa simenti limalowa mu pores ndi capillary ya masanjidwewo, ufa wa latex umapanga filimu mu pores ndi ma capillaries ndipo umakhazikika pamwamba pa masanjidwewo, motero kuonetsetsa kuti pali zabwino. kugwirizana mphamvu pakati pa zinthu simenti ndi masanjidwewo [4] . Pamene putty imachotsedwa mu mbale yoyesera, zikhoza kupezeka kuti kuwonjezeka kwa kuchuluka kwa ufa wa latex kumawonjezera kumamatira kwa putty ku gawo lapansi. Komabe, pamene kuchuluka kwa ufa wa latex kunali pamwamba pa 4%, kuwonjezeka kwa mphamvu zomangira kunachepetsedwa. Osati kokha redispersible latex ufa, komanso inorganic zipangizo monga simenti ndi heavy calcium carbonate zimathandiza kuti kugwirizana mphamvu putty.
Kukana kwamadzi ndi kukana kwa alkali kwa putty ndiyeso lofunikira kuti muwone ngati putty angagwiritsidwe ntchito ngati kukana kwamadzi khoma lamkati kapena putty lakunja. Mkuyu 2 anafufuza zotsatira za kuchuluka kwa ufa wa latex wosakanizikanso pa kukana kwa madzi kwa putty.
Monga momwe tingawonere kuchokera ku Chithunzi 2, pamene kuchuluka kwa ufa wa latex ndi wocheperapo 4%, ndi kuwonjezeka kwa kuchuluka kwa ufa wa latex, kuchuluka kwa madzi kumawonetsa kutsika. Pamene mlingo unali woposa 4%, kuchuluka kwa madzi kumatsika pang'onopang'ono. Chifukwa chake ndi chakuti simenti ndizomwe zimamangiriza mu putty, pamene palibe redispersible latex ufa wowonjezeredwa, pali kuchuluka kwa voids mu dongosolo, pamene redispersible latex ufa wawonjezedwa, emulsion polima yopangidwa pambuyo pa kubalalitsidwanso ikhoza kusungunuka kukhala filimu mu putty voids, kusindikiza ma voids mu putty system, ndikupanga zokutira za putty ndi kukanda kuti apange filimu yowuma pamwamba mutatha kuyanika, motero kupewa kulowetsedwa kwamadzi, kuchepetsa kuchuluka kwa mayamwidwe amadzi, kuti apitirire. kukana madzi. Mlingo wa latex ufa ukafika pa 4%, ufa wa latex wopangidwanso ndi redispersible polima emulsion ukhoza kudzaza ma voids mu dongosolo la putty kwathunthu ndikupanga filimu yathunthu komanso wandiweyani, motero, chizolowezi cha kuchepa kwa mayamwidwe amadzi. imakhala yosalala ndi kuchuluka kwa ufa wa latex.
Poyerekeza zithunzi za SEM za putty zopangidwa mwa kuwonjezera ufa wa latex wowonjezera kapena ayi, zikhoza kuwoneka kuti mu Mkuyu 3 (a) , zinthu zowonongeka sizimangiriridwa mokwanira, pali voids ambiri, ndipo voids sizigawidwa mofanana, kotero, mphamvu yake yomangirira si yabwino. Kuchuluka kwa voids mu dongosolo kumapangitsa madzi kukhala osavuta kulowa, kotero kuti madzi amayamwa madzi ndi apamwamba. Mkuyu. 3 (b) , emulsion polima pambuyo kachiwiri kubalalika akhoza kwenikweni kudzaza voids mu dongosolo putty ndi kupanga filimu wathunthu, kotero kuti inorganic zakuthupi mu dongosolo lonse putty akhoza omangika kwambiri kwathunthu, ndipo kwenikweni si. kukhala ndi kusiyana, chifukwa chake kumatha kuchepetsa kuyamwa kwa madzi a putty. Poganizira mphamvu ya ufa wa latex pa mphamvu yogwirizanitsa ndi kukana madzi a putty, ndikuganizira mtengo wa ufa wa latex, 3% ~ 4% ya ufa wa latex ndi woyenera. Mlingo wake ukakhala 3% ~ 4%, putty imakhala ndi mphamvu zomangirira komanso kukana madzi abwino
Nthawi yotumiza: Jul-19-2023