Emulsion le redispersible latex phofo e ka theha matla a phahameng a tensile le matla a tlamahano holim'a lisebelisoa tse fapaneng ka mor'a hore filimi e thehoe, e sebelisoa e le binder ea bobeli ka seretse ho kopanya le samente, samente le polymer ka ho latellana Fana ka ho bapala ka botlalo ho matla a tšoanang ho ntlafatsa. tshebetso ya seretse.
Ka ho shebella microstructure ea lintho tse entsoeng ka polymer-samente, ho lumeloa hore ho eketsoa ha phofo ea morao-rao ea latex ho ka etsa hore polymer e thehe filimi 'me e be karolo ea lerako la lesoba,' me e etse hore seretse se be le sebopeho se feletseng ka matla a ka hare, e ntlafatsang matla a ka hare a seretse. Matla a polymer, ka hona a ntlafatsa khatello ea maikutlo ea seretse le ho eketsa khatello ea mantlha.
The microstructure ea polymer ka seretse ha e e-s'o fetohe ka nako e telele, 'me e boloka bonding e tsitsitseng, flexural le compressive matla, le hydrophobicity e ntle. Mochini oa sebopeho sa "latex powder" o ka sebelisoang hape ka matla a likhomaretsi tsa lithaele o fumane hore ka mor'a hore polymer e omelle filiming, filimi ea polymer e theha khokahano e feto-fetohang pakeng tsa seretse le thaele ka lehlakoreng le leng, 'me ka lehlakoreng le leng, polymer ka lehlakoreng le leng. seretse se secha Eketsa moea oa seretse mme o ama sebopeho le ho koloba ha bokaholimo, ebe nakong ea ts'ebetso ea ho beha, polymer e boetse e na le tšusumetso e ntle ts'ebetsong ea hydration le shrinkage ea samente ka se tlamang, e leng tla kenya letsoho ntlafatsong Bond matla na le thuso e molemo.
Ho kenyelletsa phofo ea latex e ka sebelisoang hape seretseng ho ka ntlafatsa haholo matla a tlamahano le lisebelisoa tse ling, hobane phofo ea hydrophilic latex le karolo ea mokelikeli ea ho emisoa ha samente e kenella ka har'a pores le capillaries ea matrix, 'me phofo ea latex e kenella ka har'a pores le capillaries. . Filimi e ka hare e thehoa 'me e tsitsitse ka thata holim'a substrate, kahoo e tiisa matla a maqhama a matle pakeng tsa lisebelisoa tsa cementitious le substrate.
Ntlafatso ea phofo ea latex ts'ebetsong ea seretse e bakoa ke taba ea hore phofo ea latex ke polymer e phahameng ea molek'hule e nang le lihlopha tsa polar. Ha latex phofo e kopantsoe le likaroloana tsa EPS, karolo e seng ea polar ka har'a ketane e kholo ea polymer ea phofo ea latex e tla ba Physical adsorption e tla etsahala ka sebaka se seng sa polar sa EPS. Lihlopha tsa polar tse polymer li lebisitsoe ka ntle holim'a likaroloana tsa EPS, e le hore likaroloana tsa EPS li fetohe ho tloha ho hydrophobicity ho ea ho hydrophilicity. Ka lebaka la ho fetoloa ha bokaholimo ba likaroloana tsa EPS ka phofo ea latex, e rarolla bothata ba hore likaroloana tsa EPS li pepesehela metsi habonolo. Ho phaphamala, bothata ba ho beha seretse se seholo. Ka nako ena, ha samente e eketsoa 'me e kopantsoe, lihlopha tsa polar tse adsorbed holim'a likaroloana tsa EPS li sebelisana le likaroloana tsa samente ebe li kopanya haufi-ufi, e le hore ho sebetsa ha seretse sa EPS ho ntlafatsoe haholo. Sena se bonahala ka taba ea hore likaroloana tsa EPS li kolobisoa habonolo ke pente ea samente, 'me matla a ho kopanya pakeng tsa tse peli a ntlafala haholo.
Nako ea poso: Mar-18-2023