Redispersible latex powder inowanzoshandiswa organic gelling material, inogona kuparadzirwa zvakare mumvura kuti iite emulsion mushure mekusangana nemvura. Kuwedzera redispersible latex poda inogona kuvandudza mashandiro emvura ekuchengetedza simende ichangobva kusanganiswa semende, pamwe nekuita kwekubatanidza, kuchinjika, kusamira uye kusadzivirirwa kwekuomarara kwesamende yakaoma simende. Iyo latex poda inoshandura kuenderana uye kutsvedza kweiyo sisitimu mukunyorova kusanganisa mamiriro, uye kubatana kunovandudzwa nekuwedzera latex poda. Mushure mekuomeswa, inopa yakatsetseka uye yakaomeswa pamusoro pedenga nechisimba chakabatana, uye inovandudza iyo interface maitiro ejecha, matombo uye pores. , yakagadziridzwa mufirimu pane interface, iyo inoita kuti zvinhu zviwedzere kushanduka, inoderedza elastic modulus, inotora thermal deformation stress kusvika pamwero mukuru, uye ine kudzivirira kwemvura muchikamu chekupedzisira, uye tembiricha yebuffer uye deformation yezvinhu hazvienderani.
Kuumbwa kweinoenderera mberi polymer firimu kwakakosha zvakanyanya pakuita kwepolymer-yakagadziridzwa simende dhaka. Munguva yekumisikidza uye kuomeswa kwesimende paste, mhango yakawanda inogadzirwa mukati, inova iyo isina kusimba semendi paste. Mushure mekunge iyo redispersible latex poda yawedzerwa, iyo latex poda inokurumidza kupararira mu emulsion kana ikasangana nemvura, uye inoungana munzvimbo ine mvura yakawanda (kureva, mugomba). Sezvo simende paste inogadzika uye ichiomesa, kufamba kwepolymer particles kunowedzera kurambidzwa, uye kusawirirana kwechiso pakati pemvura nemhepo kunovamanikidza kuti vawirirane zvishoma nezvishoma. Kana zvimedu zvepolymer zvasangana, network yemvura inoputika kuburikidza necapillaries, uye iyo polima inoumba firimu rinoenderera rakatenderedza mhango, ichisimbisa aya asina kusimba mavara. Panguva ino, iyo polymer firimu haigoni kungoita hydrophobic basa, asiwo haivharidzi capillary, kuitira kuti zvinhu zvive zvakanaka hydrophobicity uye mhepo inopera.
Iyo simende dhaka isina polymer yakanyatso sungirirwa pamwe chete. Kusiyana neizvi, iyo polymer yakagadziridzwa simende dhaka inoita kuti dhaka rese ribatanidzwe zvakanyanya nekuda kwekuvapo kwepolymer firimu, nekudaro kuwana zvirinani zvemuchina uye kusamira kwemamiriro ekunze bonde. Mu latex poda yakagadziridzwa simende dhaka, iyo latex poda ichawedzera porosity ye simende paste, asi kuderedza porosity yenzvimbo yekushandura yekushandura pakati pesement paste uye aggregate, zvichiita kuti porosity yese yevhu ive isingachinji. Mushure mekunge latex poda yaumbwa kuita firimu, inogona kuvharira zvirinani ma pores mudhaka, ichiita chimiro cheiyo interface yekuchinja nzvimbo pakati pesimende paste uye aggregate yakawedzera dense, uye kupindira kwekudzivirira kwelatex poda yakagadziridzwa dhaka inovandudzwa. , uye kukwanisa kudzivisa kukukurwa kwezvinobudisa nhau zvinokuvadza kunowedzerwa. Iine mhedzisiro yakanaka pakuvandudza kusimba kwedhaka.
Nguva yekutumira: Mar-14-2023