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.
Udindo wa ufa wa latex wopangidwanso mumatope umayendetsedwa ndi njira ziwiri za simenti ya hydration ndi kupanga filimu ya polima. Mapangidwe a kaphatikizidwe ka simenti hydration ndi mapangidwe a filimu ya polima amamalizidwa munjira zinayi:
(1) Pambuyo pa redispersible latex ufa wosakanikirana ndi matope a simenti, amamwazikana mofanana mu dongosolo;
(2) The polima particles ndi waikamo pamwamba pa simenti hydration mankhwala gel osakaniza / unhydrated simenti tinthu osakaniza;
(3) The polima particles kupanga mosalekeza ndi yaying'ono stacked wosanjikiza;
(4) Pa ndondomeko simenti hydration, ndi odzaza kwambiri polima particles aggregate mu mosalekeza filimu, bonding ndi mankhwala hydration pamodzi kupanga wathunthu maukonde dongosolo.
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.
Redispersible latex ufa umagwira ntchito yofunikira ngati chowonjezera pamatope omanga. Kuonjezera redispersible latex ufa mu matope akhoza kukonza zinthu zosiyanasiyana matope monga zomatira matailosi, matenthedwe kutchinjiriza matope, matope okha, putty, pulasitala matope, matope okongoletsera, ophatikizana, kukonza matope ndi zinthu zosindikizira madzi, ndi zina zambiri. ntchito yomanga matope. Zachidziwikire, pali zovuta zosinthika pakati pa ufa wopangidwa ndi latex wopangidwanso ndi simenti, zosakaniza ndi zosakaniza, zomwe ziyenera kutsatiridwa mokwanira pazogwiritsa ntchito zina.
Nthawi yotumiza: Mar-14-2023