Iyo Nhoroondo Yekuvandudza yeRedispersible Powder

Redispersible poda (RDP) imhando yepolymer poda inoshandiswa muindasitiri yekuvaka sekuwedzera mune zvigadzirwa-simende zvakaita sedhaka, grouts, uye self-leveling makomisheni. MaRDPs akatanga kugadzirwa muma1950s uye akave chinhu chakakosha muzvigadzirwa zvemazuva ano zvekuvaka. Muchinyorwa chino, isu tichanyatso tarisisa nhoroondo yekuvandudza yeRDP uye kukosha kwayo muindasitiri yekuvaka.

Makore ekutanga

MaRDP ekutanga akagadzirwa mu1950s nekambani yeGerman inonzi Wacker Chemie AG. Panguva iyoyo, Wacker Chemie AG yakanga ichigadzira zvinhu zvitsva zvekugadzira kuti zvizadzise zvinodiwa nekukura kwemashure ehondo yekuvaka. Vakanga vachitsvaga nzira yekuvandudza zvinhu zvesimende-based materials, zvakadai semvura inodzivirira, kusimba, uye kushanduka.

Mumazuva ekutanga, maRDPs akagadzirwa nekunyunguduka kwepolyvinyl acetate (PVA) mune yakanyungudutsa uyezve kupfapfaidza mhinduro mukamuri yaipisa umo iyo solvent yaizobuda, ichisiya mushure mehupfu hwakatsetseka. Hupfu uhu hunogona kuparadzirwa nyore nyore mumvura uye huchishandiswa sechiwedzera muzvigadzirwa zvine simende.

Nekudaro, pakanga paine zvimwe zvisingakwanisi kune iyi yekutanga fomu yeRDP. Semuenzaniso, zvainge zvakaoma kudzora hukuru hwehupfu uye chimiro chehupfu, izvo zvinogona kukanganisa kushanda kwayo muzvigadzirwa zvesimende. Mukuwedzera, hupfu hwakanga husina kunyatsogadzikana uye hunowanzoita mapundu kana zviputi, zvichiita kuti zvive zvakaoma kubata nekushandisa.

Kuvandudzwa uye zvitsva

Kwemakore, vaongorori uye mainjiniya vakaita kuvandudza kwakakura kumaitiro ekugadzira uye zvivakwa zveRDPs. Semuyenzaniso, kufambira mberi kwepolymer chemistry kwakonzera kuvandudzwa kwemapolima matsva anopa kuvandudzwa kwekuita uye kugadzikana.

Imwe yebudiriro yakakosha muhunyanzvi hweRDP yakauya muma1980 nekuunzwa kwemaitiro matsva ekugadzira anonzi spray drying. Iyi nzira inosanganisira kupfapfaidza emulsion yepolymer mukamuri inopisa umo mvura inoputika, ichisiya poda yakanaka. Iyi nzira yakabvumira kutonga kukuru pamusoro pekukura kwechidimbu uye chimiro chehupfu, zvichiita kuti kuwedzere kuwirirana uye kufungidzirwa kushanda mune zvigadzirwa zvesimende.

Imwe hunyanzvi muRDP tekinoroji yakauya nekuunza redispersible latex powder (RPL), iyo inogadzirwa kubva kune latex emulsion panzvimbo yePVA. RPLs inopa yakagadziridzwa kudzivirira kwemvura uye kunamatira kana ichienzaniswa nePVA-based RDPs, ichivaita sarudzo yakakurumbira yekunze kwekushandisa senge stucco neEIFS (kunze kwekuvhara uye kupedzisa system).

Zvikumbiro uye zvinobatsira

MaRDP anopa akati wandei mabhenefiti muindasitiri yekuvaka, kusanganisira kuvandudzwa kwekushanda, kunamatira, uye kuramba mvura. Inogona kushandiswa mune zvakasiyana-siyana zvesimende-based zvigadzirwa, zvinosanganisira madhaka, grouts, self-leveling compounds, uye tile adhesives.

Imwe yemabhenefiti akakosha eRDPs kugona kwavo kuvandudza kushanda uye kureruka kwekushandisa kwesemende-based zvigadzirwa. Vanogona kuderedza kuwanda kwemvura inodiwa kuti uwane kuwirirana kunodiwa, izvo zvinogona kuvandudza simba uye kusimba kwechigadzirwa chakapedzwa. Vanogonawo kubatsira kuderedza kutsemuka uye shrinkage, izvo zvinogona kuitika kana simende-based zvigadzirwa zvikaoma nekukurumidza.

Pamusoro pezvo, maRDP anogona kuvandudza kunamatira kwezvigadzirwa-simende kune akasiyana ma substrates, anosanganisira huni, simbi, uye masonry. Vanogona zvakare kuvandudza kudzivirira kwemvura uye kusimba kwezvigadzirwa-simende, zvichiita kuti zvive zvakanaka kuti zvishandiswe munzvimbo dzakanyorova kana nzvimbo dziri pasi pekukwira kwetraffic kana kukanganisa.

Mhedziso

Mukupedzisa, nhoroondo yebudiriro yeRDP yakaratidzwa nekufambira mberi kwakakosha mumapolymer chemistry uye maitiro ekugadzira. Kubva payakatanga kuzvininipisa muma1950s, RDP yave chinhu chakakosha muzvigadzirwa zvemazuva ano zvekuvaka, ichipa mabhenefiti akawanda maererano nekushanda, kunamatira.