Chiyambi cha RDP-Redispersible Polymer Powder

Redispersible polymer powder (RDP) ndi ufa wopangidwa ndi polima womwe umagwiritsidwa ntchito mosiyanasiyana pantchito yomanga.RDP idapezedwa ndi kuyanika kutsitsi kwa ma emulsions a polima.Amagwiritsidwa ntchito kwambiri m'makina a simenti kuti apititse patsogolo zinthu zamatope monga adhesion, madzi kukana ndi mphamvu flexural.

RDP imapangidwa ndi ma polima osiyanasiyana, kuphatikiza vinyl acetate-ethylene (VAE), styrene-butadiene (SB), ethylene-vinyl chloride (EVC), ndi polyvinyl alcohol (PVA).Ma polima awa adapangidwa kuti azigwirizana ndi mitundu yosiyanasiyana ya zomangira monga simenti, laimu ndi gypsum.Amagwiritsidwa ntchito m'mitundu yosiyanasiyana ya ntchito kuphatikizapo zomatira matailosi, zodzikongoletsera zokha, zotchingira madzi komanso kutsekereza kwakunja ndi makina omaliza (EIFS).

Njira yopangira RDP imakhala ndi magawo atatu akuluakulu: polymerization, emulsification ndi kuyanika kwautsi.Mu polymerization siteji, monomers ndi polymerized pansi zinthu zinazake, monga kutentha, kuthamanga ndi anachita nthawi.The chifukwa polima kubalalitsidwa ndi okhazikika ndi surfactants kuteteza tinthu agglomeration.Mu emulsification siteji, ndi polima kubalalitsidwa ndi zina kukonzedwa kuti apange emulsion, amene ndiye utsi zouma kupeza RDP.Pa kuyanika kutsitsi, madzi amasanduka nthunzi ku emulsion m'malovu, kupanga polima particles.Ufa wotsatirawo umasonkhanitsidwa ndi kupakidwa kuti utumizidwe.

Katundu wa RDP amadalira zinthu zingapo monga mtundu wa polima, kukula kwa tinthu ndi kapangidwe kake.Polima yomwe imagwiritsidwa ntchito kwambiri pa RDP ndi VAE, yomwe imakhala ndi zomatira komanso kukana madzi.Kukula kwa tinthu ta RDP kumatha kusiyanasiyana kuchokera ku ma microns angapo mpaka ma millimeter angapo, kutengera ntchito.Mankhwala a RDP amathanso kusiyanasiyana kutengera zomwe mukufuna.Mwachitsanzo, ma RDP amatha kukhala ndi zina zowonjezera monga mapulasitiki, ma dispersants ndi ma thickeners kuti awonjezere katundu wawo.

RDP ili ndi zabwino zambiri kuposa mitundu ina ya ma polima omwe amagwiritsidwa ntchito pomanga.Ubwino umodzi waukulu ndikutha kufalikiranso m'madzi.Izi zikutanthauza kuti RDP ikhoza kusakanikirana ndi madzi kuti ikhale emulsion yokhazikika, yomwe ingagwiritsidwe ntchito m'njira zosiyanasiyana.Kuchulukitsanso kwa RDP kumadalira kapangidwe kake ka mankhwala ndi kukula kwake.Ma particles a RDP adapangidwa kuti azigwirizana ndi madzi ndipo amabalalika mwachangu akasakanikirana ndi madzi.

Ubwino wina wa RDP ndikutha kupititsa patsogolo magwiridwe antchito a simenti.RDP imatha kupititsa patsogolo kumamatira pakati pa matope ndi gawo lapansi, kuchepetsa kuchepa ndikuwonjezera mphamvu yamatope.Zimathandizanso kuti madzi asasunthike mumatope, kuteteza madzi kulowa komanso kuchepetsa ngozi ya nyengo.