Redispersible looj hmoov (RDP) yog cov khoom tseem ceeb hauv tsev thiab tau siv dav hauv kev tsim cov nplaum, cov ntaub ntawv phab ntsa, cov ntaub ntawv hauv pem teb, cov ntaub ntawv hauv pem teb. Nws zoo redispersibility, adhesion thiab yoog tau yooj yim muab nws qhov tseem ceeb thaum lub sijhawm tsim kho.
1. Kev npaj ntawm emulsion
Thawj kauj ruam uas ua rau redispersible looj hmoov yog qhov kev npaj ntawm emulsion. Qhov no feem ntau yog ua los ntawm emulsion polymerization. Emulsion Polascerization yog cov txheej txheem ua kua tsim los ntawm uniformly dispersing monomers, emulsifiers, pib cov ntaub ntawv hauv dej. Thaum lub sij hawm polymerization, cov monomers polymerize nyob rau hauv qhov kev txiav txim ntawm cov pib los ua cov saw polymer, thiaj li ua tau ruaj khov emulsion.
Feem ntau siv monomers rau emulsion polasylene suav nrog cov ethylene, styrene, styrene, thiab monomers monomers tuaj yeem xaiv rau Copolymerization. Piv txwv li, ethylene-vinyl acetate copolymer (EVA) emulsion yog siv dav nyob rau hauv kev npaj ntawm recedix hmoov vim nws cov dej zoo tsis kam thiab cov tshuaj nplaum.
2. Txau kom qhuav
Tom qab emulsion tau npaj, nws yuav tsum tau hloov mus rau hauv cov hmoov av redispersible looj hmoov. Cov kauj ruam no feem ntau tau ua tiav los ntawm kev tshuaj tsuag tshuab ziab. Txau kom qhuav yog txoj kev ziab uas hloov cov khoom ua kom nrawm nrawm ua kua rau hauv cov hmoov.
Thaum lub sij hawm cov tshuaj tsuag cov txheej txheem kom qhuav, cov emulsion yog atomized rau hauv cov tee dej zoo los ntawm lub cev thiab hu nrog huab cua kub kub. Cov dej nyob hauv cov dej ntws sai sai evaporates, thiab cov seem khoom siv cov condenses rau hauv cov hmoov me me. Tus yuam sij rau tshuaj tsuag kom qhuav yog los tswj cov ziab khaub ncaws kom ruaj khov thiab lub sijhawm kom qhuav, thaum tsis txhob muaj thermal degradation tshwm sim los ntawm kev kub siab.
3. Nto Kho
Txhawm rau txhim kho kev ua tau zoo thiab kev ruaj ntseg ntawm redispersible looj hmoov, nws cov nplaim 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 cov txheej txheem sib txuas ntxiv xws li ntxiv cov tshuaj tiv thaiv kev tawm tsam, txheej cov neeg laus thiab cov neeg sawv cev thiab surfactants. Los tiv thaiv cov neeg sawv cev tuaj yeem tiv thaiv cov hmoov los ntawm kev tso tseg thaum lub sijhawm cia thiab tswj hwm nws cov kua zoo; cov cov neeg muaj zog feem ntau siv qee cov dej-soluble polymers kom tsho loj cov hmoov yas kom txhob tiv thaiv noo noo; Qhov sib ntxiv ntawm surfactants tuaj yeem txhim kho cov recispersibility ntawm looj cov hmoov kom nws tuaj yeem ua kom sai li sai thiab tawg tom qab ntxiv dej.
4. Ntim thiab cia
Cov kauj ruam kawg hauv cov txheej txheem ntau lawm ntawm redispersible looj hmoov ntim khoom thiab cia. Txhawm rau kom ua tau zoo thiab ua tau zoo ntawm cov khoom lag luam, yuav tsum tau them rau kev ya raws, muaj kuab paug thiab hmoov av los ntawm ya lub sijhawm ntim khoom. Feem ntau recispersible looj hmoov yog ntim rau hauv cov hnab ntawv muaj cov hnab yas ntim cov hnab yas uas muaj cov tso rau sab hauv lub hnab kom tiv thaiv noo noo.
Thaum khaws cia, cov hmoov liab liab yuav tsum muab tso rau hauv ib puag ncig qhuav, kom deb ntawm kev ua pa ncaj qha, kom tiv thaiv hmoov los yog ua rau muaj kev ua phem.
Cov txheej txheem ntau lawm ntawm redispersible looj roj ntau ntxiv rau ntau cov kauj ruam xws li emulsion npaj, tshuaj kho kom qhuav, ntim thiab ntim khoom. Los ntawm kev tswj cov txheej txheem txheej txheem ntawm txhua qhov txuas, redispersible looj cov khoom zoo thiab ruaj khov yuav ua tau kom tau raws li cov kev xav tau ntawm lub tsev cov khoom lag luam. Nrog kev nce qib nruam ntawm thev naus laus zis, txheej txheem npaj ntawm redispersible looj tes zoo thiab ua tau zoo nyob rau yav tom ntej, thiab kev ua haujlwm ntawm cov khoom tseem yuav muaj kev txhim kho ntxiv.
Lub sij hawm Post: Lub Yim Hli 27-2024