Okwu Mmalite nke RDP-Redispersible Polymer Powder

Redispersible polymer powder (RDP) bụ polymer dabeere ntụ ntụ eji na ngwa dị iche iche na-ewu ụlọ ọrụ. Enwetara RDP site na ihicha ihicha nke emulsions polymer. A na-eji ya eme ihe n'ọtụtụ ebe na usoro ciment iji melite njirimara nke ngwa agha dị ka adhesion, nkwụsị mmiri na ike mgbanwe.

RDP bụ ụdị polymers dị iche iche, gụnyere vinyl acetate-ethylene (VAE), styrene-butadiene (SB), ethylene-vinyl chloride (EVC), na mmanya polyvinyl (PVA). Emebere polymers ndị a ka ha kwekọọ na ụdị ihe dị iche iche dị ka ciment, lime na gypsum. A na-eji ha n'ụdị ngwa dị iche iche gụnyere tile adhesives, ogige ndị na-edozi onwe ha, mkpuchi mmiri na mkpuchi mpụta na usoro mmecha (EIFS).

Usoro nrụpụta nke RDP nwere usoro atọ bụ isi: polymerization, emulsification na ihicha ịgba. N'ime usoro polymerization, a na-eme monomers n'okpuru ọnọdụ ụfọdụ, dị ka okpomọkụ, nrụgide na oge mmeghachi omume. Ihe ndị na-akpata polymer mgbasa na-stabilized na surfactants iji gbochie urughuru agglomeration. Na emulsification ogbo, na polymer dispersion na-esikwa ọzọ emepụta emulsion, nke a na-efesa a mịrị amị iji nweta RDP. N'oge ihicha ịgba, mmiri na-epupụta site na ụmụ irighiri mmiri emulsion, na-akpụ mkpụrụ osisi polymer. A na-anakọta ntụ ntụ nke na-esi na ya pụta ma chịkọta ya maka mbupu.

Ngwongwo nke RDP na-adabere n'ọtụtụ ihe dị ka ụdị polymer, nha nha na ihe mejupụtara kemịkal. Polymer a na-ejikarị eme ihe maka RDP bụ VAE, nke nwere ezigbo adhesion na mmiri na-eguzogide. Ogo urughuru nke RDP nwere ike ịdị iche site na microns ole na ole ruo milimita ole na ole, dabere na ngwa ahụ. Ngwakọta kemịkalụ nke RDP nwekwara ike ịdịgasị iche dabere na njirimara achọrọ. Dịka ọmụmaatụ, RDP nwere ike ịnwe mgbakwunye ndị ọzọ dị ka plasticizers, dispersants na thickeners iji welie ihe onwunwe ha.

RDP nwere ọtụtụ uru karịa ụdị polymers ndị ọzọ eji arụ ọrụ. Otu n'ime uru ndị bụ isi bụ ikike ya ịgbasa na mmiri. Nke a pụtara na enwere ike ịgwakọta RDP na mmiri iji mepụta emulsion kwụsiri ike, nke enwere ike iji ya na ngwa dị iche iche. The redispersibility nke RDP dabeere ya chemical mejupụtara na urughuru size. Emebere irighiri RDP ka ọ bụrụ mmiri dakọtara ma na-agbasa ngwa ngwa mgbe agwakọta ya na mmiri.

Uru ọzọ nke RDP bụ ikike ya iji melite arụmọrụ nke usoro ciment. RDP nwere ike melite nrapado n'etiti ngwa agha na mkpụrụ, belata shrinkage na welie ike nke ngwa agha. Ọ na-emekwa ka mgbochi mmiri nke ngwa agha dịkwuo mma, na-egbochi ịbanye mmiri na ibelata ihe ize ndụ nke ihu igwe.