Redispersible latex poda uye simende ndiyo huru yekubatanidza uye firimu-inogadzira zvinhu zvemvura inodzivirira putty. Iyo inodzivirira mvura ndeye:
Munguva yekusanganiswa kweiyo redispersible latex poda uye simende, iyo latex poda inoramba ichidzoserwa kune yekutanga emulsion fomu, uye latex particles inoparadzirwa zvakafanana mune simende slurry. Mushure mekunge simenti yasangana nemvura, iyo hydration reaction inotanga, iyo Ca (OH) 2 mhinduro yakazara uye makristasi anonaya, uye ettringite makristasi uye hydrated calcium silicate colloids inoumbwa panguva imwe chete, uye latex particles inoiswa pane gel uye. isina mvura. pazvimedu zvesimende.
Nekufambira mberi kweiyo hydration reaction, zvigadzirwa zve hydration zvinoramba zvichiwedzera, uye latex zvimedu zvishoma nezvishoma zvinoungana mumavoids ezvigadzirwa zvemukati sesimende, uye zvinogadzira dhizaini rakazara pamusoro peiyo simende gel. Nekuda kwekudzikisira zvishoma nezvishoma kwehunyoro hwakaoma, iyo yakadhindwazve latex zvimedu zvakasungirirwa mugel uye voids zvinoungana kuti zvigadzire firimu rinoenderera, richigadzira musanganiswa nesamende paste inopindirana matrix, uye kugadzira simende paste uye imwe pfupa yehupfu yakanamirwa kune mumwe nemumwe. . Nekuti iyo latex particles inobatana uye inoumba firimu munzvimbo yekuchinja kwesemende uye mamwe mapoda, iyo interfacial shanduko yenzvimbo yeputty system yakanyanya kuoma, nekudaro ichivandudza kudzivirira kwayo kwemvura.
Panguva imwecheteyo, mapoka anoshanda anogadzirwa neiyo redispersible latex poda mushure mekupararira, senge inoshanda monomer methacrylic acid yakaunzwa panguva yekuumbwa kweemulsion, ine mapoka ecarboxyl, anogona kuyambuka-kubatanidza neCa2 +, Al3+, nezvimwe. simende inorema calcium hydration chigadzirwa. , gadzira yakakosha bhiriji chisungo, gadzirisa chimiro chesimende yakaomeswa dhaka, uye wedzera compactness ye putty interface. Iyo yakadhindwazve latex particles inoumba inoenderera uye dense firimu muvoids ye putty system.
Nguva yekutumira: Nov-01-2022