Redispersible Latex Powder (RDP) yog cov khoom siv tseem ceeb hauv tsev thiab siv dav hauv kev tsim cov nplaum, cov ntaub ntawv phab ntsa, cov ntaub ntawv hauv pem teb thiab lwm yam. Nws zoo heev redispersibility, adhesion thiab saj zawg zog muab nws zoo heev thaum lub sij hawm tsim kho.
1. Kev npaj ntawm emulsion
Thawj kauj ruam hauv kev ua cov hmoov latex redispersible yog kev npaj ntawm emulsion. Qhov no feem ntau yog ua los ntawm emulsion polymerization. Emulsion polymerization yog ib theem ua kua uas tsim los ntawm uniformly dispersing monomers, emulsifiers, pib thiab lwm yam raw khoom nyob rau hauv dej. Thaum lub sijhawm txheej txheem polymerization, monomers polymerize nyob rau hauv qhov kev txiav txim ntawm cov neeg pib tsim cov saw hlau, yog li tsim cov emulsion ruaj khov.
Feem ntau siv cov monomers rau emulsion polymerization muaj xws li ethylene, acrylates, styrene, thiab lwm yam. Nyob ntawm cov khoom uas yuav tsum tau, cov monomers sib txawv tuaj yeem xaiv rau copolymerization. Piv txwv li, ethylene-vinyl acetate copolymer (EVA) emulsion yog dav siv nyob rau hauv kev npaj ntawm redispersible latex hmoov vim nws cov dej tsis kam thiab adhesion.
2. Txau kom qhuav
Tom qab cov emulsion tau npaj, nws yuav tsum tau hloov mus rau hauv cov hmoov redispersible latex hmoov. Cov kauj ruam no feem ntau yog ua tiav los ntawm kev siv tshuab ziab khaub ncaws. Txau kom qhuav yog txoj kev ziab kom qhuav sai sai hloov cov ntaub ntawv ua kua rau hauv cov hmoov.
Thaum lub sij hawm cov txheej txheem ziab qhuav, cov emulsion yog atomized rau hauv cov dej zoo los ntawm lub nozzle thiab tiv tauj nrog cov cua kub kub. Cov dej nyob rau hauv cov tee dej sai sai evaporates, thiab cov khoom tseem ceeb condenses rau hauv cov hmoov me me. Tus yuam sij rau kev ziab kom qhuav yog tswj qhov ziab kom qhuav thiab lub sijhawm kom ntseeg tau tias qhov sib txawv me me ntawm cov hmoov latex thiab kom qhuav txaus, thaum tsis txhob thermal degradation los ntawm qhov kub thiab txias.
3. Kev kho deg
Txhawm rau txhim kho kev ua tau zoo thiab kev ruaj ntseg ntawm redispersible latex hmoov, nws qhov chaw feem ntau yog kho. Lub hom phiaj tseem ceeb ntawm kev kho deg yog txhawm rau kom cov kua ntawm cov hmoov, txhim kho nws qhov chaw khaws khoom ruaj khov thiab txhim kho nws cov kev rov qab hauv dej.
Cov txheej txheem kho saum npoo feem ntau suav nrog kev ntxiv cov tshuaj tiv thaiv kab mob, cov tshuaj pleev xim thiab surfactants. Anti-caking cov neeg ua haujlwm tuaj yeem tiv thaiv cov hmoov los ntawm caking thaum lub sijhawm cia thiab tswj nws cov dej ntws zoo; Cov neeg ua haujlwm txheej txheej feem ntau siv qee cov dej-soluble polymers los npog cov hmoov latex los tiv thaiv cov dej noo nkag; qhov sib ntxiv ntawm cov surfactants tuaj yeem txhim kho qhov redispersibility ntawm latex hmoov kom nws thiaj li tau sai thiab sib npaug dispersed tom qab ntxiv dej.
4. Ntim thiab khaws cia
Cov kauj ruam kawg hauv cov txheej txheem tsim khoom ntawm redispersible latex hmoov yog ntim thiab cia. Txhawm rau kom ntseeg tau tias cov khoom zoo thiab kev ua tau zoo, yuav tsum tau them nyiaj rau kev tiv thaiv kev ya raws, kev ua qias tuaj thiab plua plav ya thaum lub sij hawm ntim khoom. Feem ntau redispersible latex hmoov yog ntim rau hauv cov hnab ntawv ntau txheej lossis hnab yas uas muaj cov dej noo zoo, thiab cov desiccant muab tso rau hauv lub hnab kom tsis txhob ya raws.
Thaum khaws cia, redispersible latex hmoov yuav tsum tau muab tso rau hauv qhov chaw qhuav, qhov cua, kom deb ntawm tshav ntuj ncaj qha thiab qhov kub thiab txias ib puag ncig, tiv thaiv cov hmoov caking lossis kev ua haujlwm tsis zoo.
Cov txheej txheem ntau lawm ntawm redispersible latex hmoov muaj ntau cov kauj ruam xws li kev npaj emulsion, tshuaj tsuag kom qhuav, kho nto, ntim thiab cia. Los ntawm kev tswj xyuas cov txheej txheem tsis raug ntawm txhua qhov txuas, cov hmoov av rov ua dua tshiab nrog kev ua tau zoo thiab ruaj khov zoo tuaj yeem tsim kom tau raws li qhov sib txawv ntawm cov khoom siv hauv tsev. Nrog rau kev nce qib ntawm kev siv thev naus laus zis tas li, cov txheej txheem kev npaj ntawm redispersible latex hmoov yuav ua rau tus phooj ywg zoo dua qub thiab ua haujlwm tau zoo nyob rau yav tom ntej, thiab kev ua haujlwm ntawm cov khoom kuj tseem yuav txhim kho ntxiv.
Post lub sij hawm: Aug-27-2024