Kenyelletso ea RDP-Redispersible Polymer Powder

Redispersible polymer powder (RDP) ke phofo e thehiloeng ho polymer e sebelisoang lits'ebetsong tse fapaneng indastering ea kaho. RDP e ile ea fumanoa ka ho omisa li-emulsion tsa polymer. E sebelisoa haholo lits'ebetsong tsa samente ho ntlafatsa thepa ea liretse tse kang ho khomarela, ho hanyetsa metsi le matla a flexural.

RDP e entsoe ka mefuta e fapaneng ea li-polymers, ho kenyelletsa vinyl acetate-ethylene (VAE), styrene-butadiene (SB), ethylene-vinyl chloride (EVC), le polyvinyl alcohol (PVA). Li-polymer tsena li etselitsoe hore li lumellane le mefuta e fapaneng ea li-binders tse kang samente, lime le gypsum. Li sebelisoa mefuteng e fapaneng ea lits'ebetso tse kenyelletsang li-adhesives tsa lithaele, metsoako ea ho ikemela, li-membrane tse thibelang metsi le litsamaiso tsa ka ntle tsa ho kenya le ho qeta (EIFS).

Ts'ebetso ea tlhahiso ea RDP e na le mekhahlelo e meraro e meholo: polymerization, emulsification le ho omisa ka spray. Mokhahlelong oa polymerization, li-monomers li entsoe ka polymerized tlas'a maemo a khethehileng, joalo ka mocheso, khatello le nako ea ho itšoara. The sephetho le polymer hasana e tsitsisoa le surfactants ho thibela phatsa agglomeration. Mokhahlelong oa emulsification, ho qhalakanngoa ha polymer ho ntse ho sebetsoa ho etsa emulsion, e ntan'o fafatsa e omisitsoe ho fumana RDP. Nakong ea ho omisa, metsi a fetoha mouoane ho tloha marotholi a emulsion, a etsa likaroloana tsa polymer. Joale phofo e hlahisoang e bokelloa ebe e phutheloa bakeng sa ho romelloa.

Thepa ea RDP e ipapisitse le lintlha tse 'maloa joalo ka mofuta oa polymer, boholo ba likaroloana le sebopeho sa lik'hemik'hale. Polymer e sebelisoang haholo bakeng sa RDP ke VAE, e nang le ho khomarela hantle le ho hanyetsa metsi. Boholo ba karoloana ea RDP bo ka fapana ho tloha ho li-micron tse seng kae ho ea ho limilimithara tse seng kae, ho itšetlehile ka kopo. Sebopeho sa lik'hemik'hale tsa RDP le sona se ka fapana ho latela thepa e lakatsehang. Mohlala, li-RDP li ka ba le li-additives tse ling tse kang li-plasticizers, dispersants le thickeners ho ntlafatsa thepa ea tsona.

RDP e na le melemo e mengata ho feta mefuta e meng ea li-polymer tse sebelisoang kahong. E 'ngoe ea melemo e ka sehloohong ke bokhoni ba eona ba ho qhala hape ka metsing. Sena se bolela hore RDP e ka kopanngoa le metsi ho etsa emulsion e tsitsitseng, e ka sebelisoang mefuteng e fapaneng ea likopo. Redispersibility ea RDP e ipapisitse le sebopeho sa eona sa lik'hemik'hale le boholo ba likaroloana. Likaroloana tsa RDP li etselitsoe ho lumellana le metsi le ho hasana ka potlako ha li kopane le metsi.

Molemo o mong oa RDP ke bokhoni ba eona ba ho ntlafatsa ts'ebetso ea litsamaiso tsa samente. RDP e ka ntlafatsa ho khomarela pakeng tsa seretse le substrate, ea fokotsa ho fokotseha le ho eketsa matla a seretse. E boetse e ntlafatsa ho thibela metsi ha seretse, ho thibela ho kenella ha metsi le ho fokotsa kotsi ea boemo ba leholimo.