Hoʻomaka i ka RDP-Redispersible Polymer Powder

ʻO ka pauka polymer redispersible (RDP) kahi pauka polymer i hoʻohana ʻia i nā noi like ʻole i ka ʻoihana kūkulu. Ua loaʻa iā RDP ma ka hoʻomaloʻo ʻana i nā emulsions polymer. Hoʻohana nui ʻia ia i nā ʻōnaehana sima e hoʻomaikaʻi i nā waiwai o nā morta e like me ka adhesion, ka pale wai a me ka ikaika flexural.

Hoʻokumu ʻia ka RDP me nā ʻano polymers, me ka vinyl acetate-ethylene (VAE), styrene-butadiene (SB), ethylene-vinyl chloride (EVC), a me ka polyvinyl alcohol (PVA). Hoʻolālā ʻia kēia mau polymers e kūpono me nā ʻano mea hoʻopaʻa like ʻole e like me ka cement, lime a me ka gypsum. Hoʻohana ʻia lākou i nā ʻano noi like ʻole me nā tile adhesives, nā pūhui hoʻonaninani ponoʻī, nā membrane wai wai a me nā ʻōnaehana waho a me nā ʻōnaehana hoʻopau (EIFS).

ʻO ke kaʻina hana o RDP he ʻekolu mau pae nui: polymerization, emulsification a me ka hoʻomaloʻo ʻana. I ka pae polymerization, ua polymerized nā monomers ma lalo o nā kūlana kūikawā, e like me ka mahana, ke kaomi a me ka manawa pane. Hoʻopaʻa ʻia ka hoʻopuehu polymer me nā surfactants e pale i ka agglomeration particle. I ka emulsification pae, ka polymer dispersion ua hou kaʻina hana e hana i ka emulsion, a laila spray maloʻo e loaa RDP. I ka wā e hoʻomaloʻo ai, hoʻoheheʻe ka wai mai nā kulu emulsion, e hana ana i nā ʻāpana polymer. A laila e hōʻiliʻili ʻia ka pauka a hoʻopaʻa ʻia no ka lawe ʻana.

Aia nā waiwai o RDP i kekahi mau mea e like me ke ʻano o ka polymer, ka nui o ka ʻāpana a me ka haku mele. ʻO ka polymer maʻamau i hoʻohana ʻia no RDP ʻo VAE, nona ka adhesion maikaʻi a me ke kūpaʻa wai. Hiki ke ʻokoʻa ka nui o ka RDP mai kekahi mau microns a i kekahi mau millimeters, e pili ana i ka noi. Hiki ke ʻokoʻa ke ʻano kemika o RDP ma muli o nā waiwai i makemake ʻia. No ka laʻana, hiki i nā RDP ke loaʻa i nā mea hoʻohui hou e like me nā plasticizers, dispersants a me nā mānoanoa e hoʻonui ai i kā lākou waiwai.

He nui nā pono o RDP ma mua o nā ʻano polymers ʻē aʻe i hoʻohana ʻia i ke kūkulu ʻana. ʻO kekahi o nā pōmaikaʻi nui ʻo ia ka hiki ke hoʻopuʻi hou i ka wai. ʻO kēia keʻano o ka RDP hiki ke hui pū me ka wai e hana i kahi emulsion paʻa, a laila hiki ke hoʻohanaʻia i nāʻano likeʻole. ʻO ka redispersibility o RDP e pili ana i kona haku mele a me ka nui o ka ʻāpana. Hoʻolālā ʻia nā ʻāpana RDP i kūpono i ka wai a hoʻopuehu koke i ka wā i hui ʻia me ka wai.

ʻO kekahi pōmaikaʻi o RDP ʻo ia ka hiki ke hoʻomaikaʻi i ka hana o nā ʻōnaehana sima. Hiki i ka RDP ke hoʻomaikaʻi i ka adhesion ma waena o ka mortar a me ka substrate, e hoʻemi i ka shrinkage a hoʻonui i ka ikaika o ka mortar. Hoʻomaikaʻi ia i ka pale wai o ka mortar, pale i ka komo ʻana o ka wai a hōʻemi i ka hopena o ka wā.