Redispersible polymer hmoov raug txheej txheem

Taw qhia

Redispersible polymer hmoov (RDP) yog ib hom polymer hmoov uas tuaj yeem hloov pauv hauv dej los tsim cov emulsion ruaj khov. Nws yog dav siv nyob rau hauv kev tsim kho kev lag luam raws li ib tug additive los txhim kho kev ua tau zoo ntawm cement-based cov ntaub ntawv. RDP yog tsim los ntawm cov txheej txheem hu ua spray-drying, uas koom nrog atomization ntawm cov tshuaj polymer rau hauv cov hmoov zoo. Cov hmoov yog ces qhuav thiab milled rau qhov xav tau particle loj.

Cov txheej txheem tsim khoom ntawm RDP suav nrog ntau cov kauj ruam, suav nrog kev xaiv cov khoom siv polymer, kev npaj tshuaj, atomization, ziab, thiab milling. Qhov zoo ntawm cov khoom kawg yog nyob ntawm qhov zoo ntawm cov khoom siv raw thiab cov txheej txheem tsis siv thaum lub sijhawm tsim khoom.

Kev xaiv Polymer

Thawj kauj ruam hauv kev tsim cov txheej txheem ntawm RDP yog xaiv cov khoom siv polymer uas tsim nyog. Kev xaiv ntawm cov polymer yog raws li qhov xav tau ntawm cov khoom kawg, xws li dej tsis kam, adhesion, thiab yoog raws. Feem ntau siv cov polymers rau RDP ntau lawm yog yas acetate-ethylene copolymer, acrylic copolymer, thiab styrene-butadiene copolymer.

Kev npaj daws teeb meem

Thaum cov polymer tau raug xaiv, nws yog tom qab ntawd yaj hauv cov kuab tshuaj los tsim cov tshuaj. Cov kuab tshuaj feem ntau siv rau kev tsim RDP yog dej thiab cov kuab tshuaj organic xws li ethanol thiab isopropanol. Qhov concentration ntawm cov tshuaj polymer yog feem ntau ntawm 10-20%.

Atomization

Cov kauj ruam tom ntej hauv kev tsim khoom ntawm RDP yog atomization. Atomization yog txheej txheem ntawm kev rhuav tshem cov tshuaj polymer rau hauv cov tee me me. Qhov no feem ntau yog ua los ntawm kev siv lub tshuab hluav taws xob siab lossis lub tshuab atomizer teb. Tom qab ntawd cov tee dej tau qhuav rau hauv cov cua kub kom tsim tau cov hmoov.

Qhuav

Cov hmoov yog ces qhuav nyob rau hauv ib tug kub cua kwj kom tshem tawm cov kuab tshuaj. Cov txheej txheem ziab yog feem ntau ua ntawm qhov kub ntawm 80-120 ° C. Lub sij hawm ziab yog nyob ntawm hom polymer siv, qhov concentration ntawm cov tshuaj, thiab qhov xav tau particle loj.

Milling

Cov kauj ruam kawg hauv kev tsim khoom ntawm RDP yog milling. Milling yog txheej txheem ntawm kev sib tsoo cov hmoov rau hauv qhov loj me me. Qhov no feem ntau yog ua tiav siv rauj zeb lossis pob zeb. Qhov loj me me ntawm cov khoom kawg yog feem ntau ntawm 5-50 microns.

Xaus

Redispersible polymer hmoov yog ib hom polymer hmoov uas tuaj yeem hloov pauv hauv dej los tsim cov emulsion ruaj khov. Nws yog dav siv nyob rau hauv kev tsim kho kev lag luam raws li ib tug additive los txhim kho kev ua tau zoo ntawm cement-based cov ntaub ntawv. Cov txheej txheem tsim khoom ntawm RDP suav nrog ntau cov kauj ruam, suav nrog kev xaiv polymer, kev npaj tshuaj, atomization, ziab, thiab milling. Qhov zoo ntawm cov khoom kawg yog nyob ntawm qhov zoo ntawm cov khoom siv raw thiab cov txheej txheem tsis siv thaum lub sijhawm tsim khoom.