Redispersible latex powder ndi zinthu zomwe zimagwiritsidwa ntchito nthawi zambiri, zomwe zimatha kubalalitsidwanso mofanana m'madzi kuti apange emulsion pambuyo pokhudzana ndi madzi. 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. Ufa wa latex umasintha kusasinthasintha ndi kuterera kwa dongosolo mumkhalidwe wosakanikirana wonyowa, ndipo mgwirizano umatheka powonjezera ufa wa latex. Pambuyo kuyanika, amapereka yosalala ndi wandiweyani pamwamba wosanjikiza ndi mgwirizano mphamvu, ndi bwino mawonekedwe zotsatira za mchenga, miyala ndi pores. , wolemeretsedwa mu filimu pa mawonekedwe, zomwe zimapangitsa kuti zinthuzo zikhale zosinthika, zimachepetsa zotanuka modulus, zimatengera kupsinjika kwa kutentha kwa kutentha kwakukulu, ndipo zimakhala ndi madzi otsutsa m'kupita kwanthawi, ndipo kutentha kwa buffer ndi kusinthika kwa zinthu ndizosagwirizana.
Kupanga filimu yopitilira polima ndikofunikira kwambiri pakuchita matope a simenti osinthidwa ndi polima. Pakukhazikitsa ndi kuumitsa kwa phala la simenti, zibowo zambiri zimapangidwira mkati, zomwe zimakhala zofooka za phala la simenti. Pambuyo powonjezera ufa wa latex wowonjezeredwa, ufa wa latex umamwazikana nthawi yomweyo mu emulsion ukakumana ndi madzi, ndikusonkhanitsa m'dera lamadzi (ndiko kuti, m'mimba). Pamene phala la simenti likukhazikika ndikuwumitsa, kuyenda kwa tinthu ta polima kumacheperachepera, ndipo kukangana kwapakati pamadzi ndi mpweya kumawakakamiza kuti agwirizane pang'onopang'ono. Pamene polima particles kukhudzana wina ndi mzake, maukonde madzi amasanduka nthunzi kudzera capillaries, ndi polima amapanga mosalekeza filimu kuzungulira patsekeke, kulimbikitsa ofooka mawanga. Panthawi imeneyi, filimu ya polima siingogwira ntchito ya hydrophobic, komanso osati kutsekereza capillary, kuti zinthuzo zikhale ndi hydrophobicity yabwino komanso mpweya wabwino.
Tondo la simenti lopanda polima limalumikizidwa momasuka kwambiri. M'malo mwake, polima kusinthidwa simenti matope kumapangitsa matope lonse zolimba kwambiri chifukwa cha kukhalapo kwa polima filimu, motero kupeza bwino makina katundu ndi nyengo kukana kugonana. Mu matope a latex ufa wosinthidwa simenti, ufa wa latex udzawonjezera porosity ya phala la simenti, koma kuchepetsa porosity ya mawonekedwe osinthika zone pakati pa simenti phala ndi aggregate, zomwe zimapangitsa kuti porosity yonse ya matope ikhale yosasinthika. Pambuyo lalabala ufa aumbike filimu, akhoza bwino kutsekereza pores mu matope, kupanga dongosolo la mawonekedwe kusintha zone pakati pa phala simenti ndi akaphatikiza wandiweyani kwambiri, ndi permeability kukana wa latex ufa kusinthidwa matope ndi bwino. , komanso kutha kukana kukokoloka kwa zoulutsira nkhani zoipa kumawonjezeka. Imakhala ndi zotsatira zabwino pakuwongolera kulimba kwa matope.
Nthawi yotumiza: Mar-14-2023