Redispersible latex powder ndi zinthu zomwe zimagwiritsidwa ntchito kwambiri ndi gelling.Ndi ufa wopezedwa ndi kupopera-kuyanika polima emulsion ndi polyvinyl mowa monga zoteteza colloid.Ufa uwu ukhoza kumwazikana mofanana m'madzi mukakumana ndi madzi., kupanga emulsion.Kuonjezera redispersible latex ufa kungathandize kuti madzi asungidwe mumatope a simenti osakanikirana, komanso kugwira ntchito, kusinthasintha, kusasunthika komanso kukana kwa dzimbiri kwa matope olimba a simenti.
Zotsatira za latexr ufa pa mphamvu ya bondi ya zinthu zopangidwa ndi simenti
Emulsion ndi redispersible latex ufa akhoza kupanga mkulu kumakokedwa mphamvu ndi kugwirizana mphamvu pa zipangizo zosiyanasiyana pambuyo filimu mapangidwe, iwo ntchito monga binder wachiwiri mu matope kuphatikiza ndi organic binder simenti, simenti ndi polima motero Perekani kusewera kwathunthu kwa lolingana mphamvu kusintha ntchito ya matope.Poona microstructure wa polima-simenti gulu zakuthupi, akukhulupirira kuti Kuwonjezera redispersible latex ufa akhoza kupanga polima kupanga filimu ndi kukhala mbali ya dzenje khoma, ndi kupanga matope mawonekedwe lonse kudzera mkati mphamvu, zomwe zimawonjezera mphamvu yamkati ya matope.Mphamvu ya polima, potero imakulitsa kulephera kwa matope ndikuwonjezera kupsinjika komaliza.Kuchita kwa nthawi yayitali kwa ufa wa latex wopangidwanso mumatope kunaphunziridwa.Zinawonedwa ndi SEM kuti patapita zaka 10, microstructure wa polima mu matope sanasinthe, ndi kugwirizana khola, flexural ndi compressive kukana akhala anakhalabe.mphamvu ndi kuthamangitsa madzi abwino.The redispersible latex ufa waphunzira momwe amapangira mphamvu zomatira matailosi, ndipo adapeza kuti polima atawumitsidwa ndikupangidwa kukhala filimu, filimu ya polima imapanga kulumikizana kosinthika pakati pa matope ndi matailosi mbali imodzi, ndi mbali imodzi. Kumbali ina, matope atsopano, polima sing'anga kumawonjezera mpweya wa matope ndipo zimakhudza mapangidwe ndi wettability pamwamba, ndipo kenako pa ndondomeko yoika, polima ali ndi chikoka bwino pa hydration ndondomeko ndi shrinkage wa simenti mu. ndi binder, zonsezi zidzathandiza kupititsa patsogolo mphamvu ya mgwirizano.
Kuwonjezera redispersible latex ufa ku matope akhoza kwambiri kusintha mphamvu yomangira ndi zipangizo zina, chifukwa hydrophilic latex ufa ndi madzi gawo la kuyimitsidwa simenti kudutsa mu pores ndi capillaries a masanjidwewo, ndi lalabala ufa likulowerera mu pores ndi capillaries. .Filimu yamkati imapangidwa ndikumangika mwamphamvu pamwamba pa gawo lapansi, motero kuonetsetsa kuti pali mgwirizano wabwino pakati pa zinthu za simenti ndi gawo lapansi.
Kukhathamiritsa kwa ufa wa latex pa ntchito ya matope ndi chifukwa chakuti ufa wa latex ndi ma polima apamwamba omwe ali ndi magulu a polar.Pamene latex ufa wothira EPS particles, sanali polar gawo mu unyolo waukulu wa latex ufa polima adzakhala Thupi adsorption zidzachitika ndi sanali polar padziko EPS.Magulu polar mu polima ndi zochokera kunja pamwamba pa EPS particles, kuti EPS particles kusintha hydrophobicity kuti hydrophilicity.Chifukwa cha kusinthidwa kwa pamwamba pa EPS particles ndi latex powder, imathetsa vutoli kuti ma EPS particles amawonekera mosavuta m'madzi.Kuyandama, vuto lalikulu kusanjikiza matope.Panthawi imeneyi, pamene simenti anawonjezera ndi kusakaniza, magulu polar adsorbed pamwamba pa EPS particles kucheza ndi particles simenti ndi kuphatikiza kwambiri, kotero kuti workability wa EPS kutchinjiriza matope kwambiri bwino.Izi zikuwonekera mu mfundo yakuti ma EPS particles amanyowetsedwa mosavuta ndi phala la simenti, ndipo mphamvu yogwirizanitsa pakati pa ziwirizi imakhala bwino kwambiri.
Nthawi yotumiza: Mar-14-2023