Ko redispersible polymer poda inokanganisa sei kushanduka kwedhaka?

Iyo admixture ine mhedzisiro yakanaka pakuvandudza kushanda kwekuvaka yakaoma-yakasanganiswa dhaka. Redispersible latex poda inogadzirwa nekupfapfaidza kuomeswa kweyakakosha polymer emulsion. Iyo yakaoma yepolymer hupfu ndeye 80 ~ 100mm spherical zvidimbu zvakaungana pamwechete. Izvi zvimedu zvinonyungudika zviri nyore mumvura, zvinogadzira kupararira kwakagadzikana zvishoma kudarika emulsion particles yepakutanga, uye inoumba firimu mushure mekushaya mvura uye kuoma.

Matanho ekugadzirisa akasiyana anoita kuti iyo redispersible latex poda ive nemhando dzakasiyana senge mvura yekudzivirira, alkali kuramba, kuramba mamiriro ekunze uye kuchinjika. Redispersible latex poda yedhaka inogona kuvandudza kupikisa, kusimba, kupfeka kuramba, kuve nyore kuvaka, kusimba kwechisungo uye kubatana, kuramba kwemamiriro ekunze, kutonhora-kunyungudika, kuramba kwemvura, simba rekushanduka uye kuramba kwesimba rekupeta dhaka. Chero bedzi simenti-yakavakirwa zvinhu ine latex poda iri kusangana nemvura, iyo hydration reaction ichatanga, uye iyo calcium hydroxide solution ichakurumidza kuzadzwa uye kupenya. Panguva imwe chete, ettringite makristasi uye calcium silicate hydrate gels inoumbwa. Solid particles anoiswa pa gel uye unhydrated simende particles. Sezvo iyo hydration reaction inofambira mberi, zvigadzirwa zve hydration zvinowedzera, uye zvimedu zvepolymer zvishoma nezvishoma zvinoungana mumacapillary pores, zvichigadzira dense kuunganidza layer pamusoro pegel uye isina mvura simende masimende. Iyo yakaunganidzwa yepolymer particles zvishoma nezvishoma inozadza pores.

Redispersible latex poda inogona kuvandudza simba rekukotama uye kusimba kwechisungo chedhaka nekuti inogona kugadzira firimu repolymer pamusoro pezvimedu zvedhaka. Iko kune pores pamusoro pefirimu, uye pamusoro pemapores izere nedhaka, iyo inoderedza kushushikana kwepfungwa. Uye ichazorora pasina kuputsa pasi pekuita kwesimba rekunze. Pamusoro pezvo, dhaka rinoumba skeleton yakaoma mushure mekunge simende yanyoroveswa, uye iyo polymer muskeleton ine basa remajoini anofambiswa, akafanana nematishu emuviri wemunhu. Iyo membrane inoumbwa nepolymer inogona kufananidzwa nemajoini nemarunda, nekudaro kuve nechokwadi kusimba uye kuchinjika kweiyo rigid skeleton.

Mune iyo polymer-yakagadziridzwa simende dhaka sisitimu, inoenderera uye yakazara yepolymer firimu yakarukwa nesamende paste uye jecha zvimedu, zvichiita kuti dhaka rese rive rakanaka, uye panguva imwechete ichiita iyo yese elastic network nekuzadza capillaries nemakomba. Naizvozvo, iyo polymer firimu inogona kunyatso fambisa kudzvanywa uye elastic tension. Iyo firimu repolymer rinogona kubhuroka kutsemuka kwe shrinkage papolymer-mortar interface, kuporesa kutsemuka kwe shrinkage, uye kugadzirisa chisimbiso uye kubatanidza simba redhaka. Kuvepo kweakanyanya kuchinjika uye akanyanya elastic polymer domains kunowedzera kuchinjika uye elasticity yedhaka, ichipa kubatana uye inosimba zvivakwa kune yakaoma skeleton. Kana simba rekunze rinoshandiswa, iyo microcrack yekukura maitiro inononoka kusvika kushushikana kwakanyanya kwasvika nekuda kwekuwedzera kushanduka uye elasticity. Iwo interwoven polymer domains anoitawo sechivharo che microcracks kuti abatanidzwe mukupinda mukati. Naizvozvo, iyo redispersible polymer poda inowedzera kutadza kushushikana uye kutadza kunetsa kwezvinhu.