Redispersible latex ufa ndi zomangira zina (monga simenti, slaked laimu, gypsum, etc.) ndi aggregates osiyanasiyana, fillers ndi zina (monga methyl hydroxypropyl mapadi efa, wowuma efa, lignocellulose, hydrophobic wothandizila, etc.) kwa thupi kusanganikirana matope mixed kuti youma-. Pamene matope osakaniza owuma akuwonjezeredwa kumadzi ndikugwedezeka, tinthu tating'ono ta latex tidzamwazikana m'madzi pansi pa zochita za hydrophilic protective colloid ndi kumeta ubweya wamakina. Nthawi yofunikira kuti ufa wokhazikika wa latex ubalalike ndi yaifupi kwambiri, ndipo index iyi ya nthawi ya redispersion ndiyonso gawo lofunikira kuti liwunike mtundu wake. Kumayambiriro kosanganikirana, ufa wa latex wayamba kale kukhudza rheology ndi ntchito ya matope.
Chifukwa cha mikhalidwe yosiyana ndi kusinthidwa kwa ufa uliwonse wogawanika wa latex, zotsatira zake zimakhalanso zosiyana, zina zimakhala ndi zotsatira zothandizira, ndipo zina zimakhala ndi zotsatira za thixotropy. Njira ya chikoka chake imachokera kuzinthu zambiri, kuphatikizapo chikoka cha latex ufa pa kuyanjana kwa madzi panthawi ya kubalalitsidwa, chikoka cha kukhuthala kosiyana kwa latex ufa pambuyo kubalalitsidwa, mphamvu ya colloid yotetezera, ndi mphamvu ya simenti ndi malamba amadzi. Zisonkhezero zimaphatikizapo kuwonjezeka kwa mpweya mumatope ndi kugawidwa kwa thovu la mpweya, komanso mphamvu ya zowonjezera zake ndi kugwirizana ndi zina zowonjezera. Choncho, kusankha mwamakonda ndi kugawanika kwa redispersible latex powder ndi njira yofunikira yokhudzira khalidwe la mankhwala. Mfundo yodziwika bwino ndi yakuti ufa wa latex womwe umapezekanso nthawi zambiri umawonjezera mpweya wa matope, motero umapangitsa kuti matope apangidwe, komanso kuyanjana ndi kukhuthala kwa latex ufa, makamaka colloid yoteteza, kuti madzi akabalalitsidwa. Pambuyo pake, matope onyowa okhala ndi latex powder dispersion amagwiritsidwa ntchito pamalo ogwirira ntchito. Ndi kuchepetsa madzi pa milingo itatu - mayamwidwe m'munsi wosanjikiza, kumwa simenti hydration anachita, ndi volatilization madzi pamwamba mpweya, ndi utomoni particles pang'onopang'ono kuyandikira , ndi zolumikizira pang'onopang'ono kuphatikiza wina ndi mzake, ndipo potsiriza kukhala mosalekeza polima filimu. Izi zimachitika makamaka pores a matope ndi pamwamba pa olimba.
Tiyenera kutsindika kuti kuti njirayi ikhale yosasinthika, ndiko kuti, pamene filimu ya polima ikukumananso ndi madzi, sidzabalalitsidwanso, ndipo colloid yotetezera ya redispersible latex ufa iyenera kupatulidwa ndi filimu ya polima. Izi si vuto mu zamchere simenti matope dongosolo, chifukwa adzakhala saponified ndi zamchere kwaiye hydration simenti, ndipo pa nthawi yomweyo, adsorption wa zinthu khwatsi-ngati pang'onopang'ono kulekanitsa ndi dongosolo, popanda chitetezo cha hydrophilicity Colloids, amene insoluble m'madzi ndi kupangidwa ndi nthawi imodzi canspers disperible, osati mochedwa, komanso mochedwa pansi pa disperible ufa, komanso mochedwa pansi pa disperible ufa. mikhalidwe yomizidwa m'madzi kwa nthawi yayitali. Mu machitidwe osakhala amchere, monga machitidwe a gypsum kapena machitidwe omwe ali ndi fillers okha, pazifukwa zina, colloid yotetezera idakalipobe mufilimu yomaliza ya polima, yomwe imakhudza kukana kwa madzi a filimuyi, koma chifukwa chakuti machitidwewa sagwiritsidwa ntchito ngati kumizidwa kwa nthawi yaitali m'madzi, ndipo polima akadali ndi mawonekedwe ake apadera, sizikhudza kugwiritsa ntchito mochedwa redisper mu machitidwe awa.
Ndi mapangidwe omaliza a polima filimu, chimango dongosolo wopangidwa ndi zinthu zachilengedwe ndi organic binders aumbike mu matope anachiritsa, ndiko kuti, zinthu hayidiroliki zimapanga chimango Chimaona ndi zolimba, ndi redispersible latex ufa amapanga filimu pakati kusiyana ndi pamwamba olimba. Kulumikizana kosinthika. Kulumikizana kotereku kungaganizidwe ngati kulumikizidwa ndi mafupa olimba ndi akasupe ang'onoang'ono ambiri. Popeza mphamvu yamphamvu ya filimu ya utomoni wa polima yopangidwa ndi ufa wa latex nthawi zambiri imakhala ndi dongosolo lapamwamba kuposa la zida za hydraulic, mphamvu ya matope yokha imatha kukulitsidwa, ndiko kuti, kugwirizana kukhale bwino. Popeza kusinthasintha ndi kupunduka kwa polima ndikwambiri kuposa momwe zimakhalira zolimba monga simenti, kupunduka kwa matope kumakhala bwino, ndipo zotsatira za kupsinjika kwamwalako zimakhala bwino kwambiri, potero kumapangitsa kuti matope azitha kukana.
Nthawi yotumiza: Mar-07-2023