Isingeniso se-RDP-Redispersible Polymer Powder

I-Redispersible polymer powder (RDP) iyimpushana esekelwe ku-polymer esetshenziswa emisebenzini ehlukahlukene embonini yezokwakha. I-RDP yatholwa ngokufafazwa kwe-emulsion ye-polymer. Isetshenziswa kabanzi ezinhlelweni zikasimende ukuthuthukisa izakhiwo zodaka ezifana nokunamathela, ukumelana namanzi namandla okuguquguquka.

I-RDP yakhiwe ngama-polymer ahlukahlukene, okuhlanganisa i-vinyl acetate-ethylene (VAE), i-styrene-butadiene (SB), i-ethylene-vinyl chloride (EVC), ne-polyvinyl alcohol (PVA). Lawa ma-polymer aklanyelwe ukuthi ahambisane nezinhlobo ezahlukene zokuhlanganisa ezifana usimende, umcako kanye negypsum. Asetshenziswa ezinhlotsheni ezihlukene zezinhlelo zokusebenza ezihlanganisa okunamathelisa amathayili, izinhlanganisela ezizilinganisa, ulwelwesi olungangenwa amanzi kanye nokufakwa kwangaphandle kanye nezinhlelo zokuphothula (EIFS).

Inqubo yokukhiqiza ye-RDP inezigaba ezintathu ezibalulekile: i-polymerization, i-emulsification kanye nokomisa isifutho. Esigabeni se-polymerization, ama-monomers enziwe nge-polymerized ngaphansi kwezimo ezithile, ezifana nezinga lokushisa, ingcindezi kanye nesikhathi sokuphendula. Umphumela wokuhlakazeka kwe-polymer uzinzile ngama-surfactants ukuvimbela ukuhlangana kwezinhlayiyana. Esigabeni se-emulsification, ukuhlakazeka kwe-polymer kuphinde kucutshungulwe ukuze kwakhiwe i-emulsion, ebese ifafazwa yomiswa ukuze kutholwe i-RDP. Ngesikhathi sokumiswa kwesifutho, amanzi ayahwamuka emaconsini e-emulsion, enze izinhlayiya ze-polymer. Impushana ewumphumela ibe isiqoqwa futhi ipakishwe ukuze ithunyelwe.

Izakhiwo ze-RDP zincike ezintweni ezimbalwa ezifana nohlobo lwe-polymer, usayizi wezinhlayiyana kanye nokwakheka kwamakhemikhali. I-polymer esetshenziswa kakhulu ye-RDP i-VAE, enokunamathela okuhle kakhulu nokumelana namanzi. Usayizi wezinhlayiyana ze-RDP ungahluka ukusuka kuma-microns ambalwa ukuya kumamilimitha ambalwa, kuye ngohlelo lokusebenza. Ukwakheka kwamakhemikhali e-RDP nakho kungahluka kuye ngezakhiwo ezidingekayo. Isibonelo, ama-RDP angaqukatha izithasiselo ezengeziwe ezifana nama-plasticizer, ama-disperants kanye nama-thickeners ukuthuthukisa izakhiwo zawo.

I-RDP inezinzuzo eziningi kunezinye izinhlobo zama-polymer asetshenziswa ekwakheni. Enye yezinzuzo eziyinhloko yikhono layo lokuphinde lihlakazeke emanzini. Lokhu kusho ukuthi i-RDP ingaxutshwa namanzi ukuze kwakhiwe i-emulsion ezinzile, engase isetshenziswe ezinhlobonhlobo zezicelo. Ukuhlakazeka kabusha kwe-RDP kuncike ekwakhekeni kwamakhemikhali nosayizi wezinhlayiyana. Izinhlayiya ze-RDP zenzelwe ukuthi zihambisane namanzi futhi zihlakazeke ngokushesha lapho zixutshwe namanzi.

Enye inzuzo ye-RDP yikhono layo lokuthuthukisa ukusebenza kwezinhlelo zikasimende. I-RDP ingathuthukisa ukunamathela phakathi kodaka ne-substrate, inciphise ukushwabana futhi ikhulise amandla odaka. Iphinde ithuthukise ukumelana namanzi kodaka, ivimbele ukungena kwamanzi futhi inciphise ingozi yesimo sezulu.