Zotsatira za Redispersible Emulsion Powder pa Slurry Structure

Redispersible latex powder ndi chinthu chomwe chimagwiritsidwa ntchito nthawi zambiri ndi organic gelling zinthu zomwe zimapezedwa poyanika polima emulsion ndi polyvinyl mowa ngati colloid yoteteza. Ikhoza kufalikiranso mofanana m'madzi kuti ipange emulsion ikakumana ndi madzi. Kuonjezera redispersible latex ufa kumatha kupititsa patsogolo magwiridwe antchito amatope osakanikirana a simenti.

Zinthu zozikidwa pa simenti zikangowonjezeredwa ndi madzi a latex ufa, hydration reaction imayamba, ndipo njira ya calcium hydroxide imafika mwachangu ndipo makhiristo amawotchedwa, ndipo panthawi imodzimodziyo, makristasi a ettringite ndi ma gels a calcium silicate hydrate amapangidwa. The particles olimba waikamo pa gel osakaniza ndi unhydrated simenti particles. Pamene hydration zimachitikira, ndi hydration mankhwala kuwonjezeka, ndi polima particles pang'onopang'ono kusonkhana mu capillary pores, kupanga kuli wodzaza wosanjikiza padziko gel osakaniza ndi pa unhydrated simenti particles. The aggregated polima particles pang`onopang`ono kudzaza pores, koma kwathunthu kwa mkati padziko pores. Monga madzi ndi yafupika ndi hydration kapena kuyanika, ndi odzaza kwambiri polima particles pa gel osakaniza ndi pores coalesce mu mosalekeza filimu, n'kupanga interpenetrating osakaniza ndi hydrated simenti phala ndi kuwongolera hydration Kugwirizana kwa mankhwala ndi aggregates.

Chifukwa mankhwala hydration ndi ma polima kupanga chophimba wosanjikiza pa mawonekedwe, zingakhudze kukula kwa ettringite ndi coarse kashiamu hydroxide makhiristo; ndipo chifukwa ma polima amapindika kukhala mafilimu m'mabowo a malo osinthira mawonekedwe, zida zopangira simenti ya polima Malo osinthira ndi ochulukirapo. Magulu omwe amagwira ntchito m'mamolekyu ena a polima apanganso machitidwe olumikizirana ndi Ca2+ ndi A13+ muzinthu za simenti ya simenti kuti apange zomangira zapadera za mlatho, kukonza mawonekedwe azinthu zolimba za simenti, kuchepetsa kupsinjika kwamkati, ndikuchepetsa kubadwa kwa ma microcracks.

Pamene mawonekedwe a gel osimenti akukula, madzi amadyedwa ndipo tinthu tating'onoting'ono ta polima timatsekeredwa pang'onopang'ono mu pores. Monga simenti ndi hydrated, chinyezi mu capillary pores amachepetsa, ndi polima particles aggregate padziko simenti hydration mankhwala gel osakaniza / unhydrated simenti tinthu osakaniza ndi akaphatikiza, potero kupanga mosalekeza odzaza wosanjikiza ndi pores lalikulu Anadzazidwa. yokhala ndi tinthu tating'onoting'ono ta polima kapena tomatira.

The omwazika emulsion wa redispersible latex ufa akhoza kupanga madzi-insoluble mosalekeza filimu (polymer network thupi) pambuyo kuyanika, ndipo otsika zotanuka modulus polima network thupi akhoza kusintha ntchito simenti; nthawi yomweyo, mu polima molekyulu Magulu ena polar mu simenti amachita mankhwala ndi mankhwala simenti hydration kupanga milatho wapadera, kusintha thupi la mankhwala simenti hydration, ndi kuchepetsa ndi kuchepetsa m'badwo wa ming'alu. Pambuyo redispersible latex ufa anawonjezera, ndi koyamba hydration mlingo wa simenti kubweza pansi, ndi polima filimu akhoza pang'ono kapena kwathunthu kukulunga simenti particles, kotero kuti simenti akhoza mokwanira hydrated ndi katundu wake zosiyanasiyana akhoza bwino.