Recispersible polymer hmoov (RDP) yog cov khoom tseem ceeb siv hauv kev tsim kho, cov xim nplaum, cov nplaum thiab lwm thaj teb. Nws yog tsim los ntawm cov tshuaj tsuag kom qhuav emulsion thiab muaj qhov zoo dispersibility thiab adhesion.
1. Cov Khoom Siv Khoom Raw
Cov ntaub ntawv raw tseem ceeb rau kev ua redispersible looj hmoov suav nrog:
Polymer emulsion: xws li polyvinyl cawv (PVA), ethylene-vinyl acetate (EVA), STYRE-acrylate (sa), thiab lwm yam), thiab lwm yam), thiab lwm yam), thiab lwm yam), thiab lwm yam), thiab lwm yam), thiab lwm yam)
Kev Tiv Thaiv Kev Tiv Thaiv: xws li polyvinyl cawv, methyl cellulose, hydroxyprropyl cellulose, thiab lwm yam.
Defoamer: Siv los tshem tawm npaus hauv cov txheej txheem ntau lawm, xws li cov roj silicone thiab polyether defoamer.
Stabilizer: xws li sodium dodecylbenzene suleczene suleczene (sdbs), sodbs), sodium polyacrylate, thiab lwm yam, siv los ua kom ruaj khov.
2. Emulsion npaj
Xaiv cov kev cai monomers tsim nyog raws li cov qauv rau polymerization tshwm sim los npaj cov polscer emulsion nrog cov khoom uas xav tau. Thaum lub sij hawm npaj ntawm emulsion, cov kauj ruam tseem ceeb hauv qab no yuav tsum tau sau tseg:
Monomer Xaiv thiab ratio: xaiv cov monomers tsim nyog, xws li lub hom phiaj, thiab txiav txim siab lawv cov kev ua tau zoo ntawm cov emulsion.
Emulsion Poliymerization: feem ntau dawb radical polymerization yog siv rau polymerize cov monomers rau cov polscer emulsion. Cov tshuaj tiv thaiv polymerization yuav tsum tau nqa tawm raws li cov kev tswj hwm raug, suav nrog qhov kub thiab txias, tus thawj coj ntxiv, etc.
Txuas ntxiv ntawm kev tiv thaiv kev tiv thaiv thiab stabilizer: Ntxiv cov nyiaj tsim nyog ntawm kev tiv thaiv kev tiv thaiv thiab stabilizer rau kev tiv thaiv cov emulsion los ntawm agglomerating thaum lub sijhawm ua kom qhuav.
3. Pretreatment ntawm Emulsion
Ua ntej tshuaj tsuag qhuav, lub emulsion xav tau ua kom pom tseeb, feem ntau yog suav nrog cov kauj ruam hauv qab no:
Pom kev: tshem tawm impurities nyob rau hauv lub pulsion los ntawm lub lim lossis centrifuge kom ntseeg tau tias qhov emulsion.
Lub siab: mloog cov emulsion rau ib cov ntsiab lus zoo los ntawm kev siv thoob plaws lossis membrane fundiciency.
4. Txau kom qhuav
Txau kom qhuav yog cov txheej txheem tseem ceeb rau kev ua cov hmoov liab redispersible. Cov kauj ruam tshwj xeeb yog raws li hauv qab no:
Xaiv tshuaj tsuag kom qhuav ntauwd: xaiv tsim kom muaj tshuaj tsuag kom qhuav cov khoom siv raws li cov khoom thiab cov zis ntawm emulsion. Cov cuab yeej siv ntau yam suav nrog Centrifugal txau kom qhuav ntauwd thiab siab txau kom qhuav ntauwd.
Kev nthuav dav cov lus qhia: Teeb tsim nyog inlet huab cua kub, qhov hluav taws xob cua sov thiab txau siab. Feem ntau, cov pa inlet huab cua kub tau tswj hwm ntawm 150-200 ℃, thiab qhov hluav taws xob tawm ntawm 60-80 ℃.
Txau cov txheej txheem: emulsion omulsion yog atomized rau cov tshuaj txau zoo los ntawm cov tshuaj txau, thiab cov dej tau nrawm los ua cov hmoov av kom qhuav.
Kev Sau Cov Hmoov: Cov hmoov txhuam tau qhuav yog sau los ntawm Cyclone Separator lossis lub hnab lim. Cov ntaub ntawv sau tau cov hmoov thiab cov khoom loj yog muab tshem tawm los ntawm kev tshuaj ntsuam kom ntseeg tau tias qhov kev sib txawv ntawm cov khoom.
5. Tom qab ua thiab ntim khoom
Lub ziab redispersible looj hmoov zoo yuav tsum tau ua kom raug tom qab ua tiav kom ntseeg tau tias nws cov kev ua tau ruaj khov thiab kev cia khoom. Kev ua tom qab yog suav nrog:
Anti-Caking Kev Kho Mob: Ntxiv tshuaj tiv thaiv cov neeg sawv cev (xws li Talcum hmoov, silicon dioxide) mus rau saum npoo ntawm cov hmoov av los ntawm agglomerating thaum khaws thiab tsheb thauj mus los.
Ntim: Raws li cov neeg siv khoom xav tau, cov hmoov yas yas tau ntim rau hauv noo noo-pov thawj thiab hmoov av-ntawv pov thawj hnab lossis cov ntoo txig. Cov av noo yuav tsum tau nruj me ntsis tswj tau thaum lub sijhawm ntim khoom kom tiv thaiv cov hmoov los ntawm nqus ya raws.
6. Tswjhwm Zoo
Thaum lub sijhawm cov txheej txheem ntau lawm, kev tswjhwm nruj yog qhov yuav tsum tau ua kom ntseeg tau tias cov cuab yeej ua tau zoo ntawm cov hmoov av redispersible. Cov khoom tswj cov khoom muaj xws li:
Particle loj faib: Qhov loj me faib tawm ntawm cov hmoov raug kuaj pom los ntawm lub laser collets loj tus kws tshuaj ntsuam xyuas cov khoom lag luam.
Adhesion lub zog: sim cov nplaum muaj zog ntawm cov hmoov yas ntawm cov sib txawv ntawm kev sib txawv los xyuas nws cov nplaum.
Recispersibility: Sib tov cov hmoov yas nrog dej kom pom tias nws tuaj yeem raug rhuav tshem thiab rov qab rau lub xeev emulsion.
7. Daim ntawv thov thiab cov kev ceev faj
Redispersible looj cov hmoov yog dav siv hauv kev tsim lub vaj cug, pobzeb nplaum, sab nrauv phab ntsa rwb thaiv tsev tshuab thiab lwm thaj teb. Cov ntsiab lus hauv qab no yuav tsum tau sau tseg thaum siv:
Cia EARD: Cov hmoov kom zoo yuav tsum muab cia rau hauv ib puag ncig qhuav thiab txias kom tsis txhob sov thiab av noo.
Kev Siv Siv Tau: Raws li cov ntawv thov yuav tsum tau ua, ntxiv cov hmoov yas looj txiav txim kom tau txais cov kev ua tau zoo tshaj plaws.
Nrog lwm cov khoom sib ntxiv: cov hmoov zoo li qub yog feem ntau siv nrog lwm cov kev sib ntxiv ntawm tes ether ether, defoamer) los txhim kho cov khoom ua haujlwm.
Redispersible looj cov hmoov nrog kev ua tau zoo tuaj yeem ua tiav. Hauv kev tsim khoom tiag tiag, nws yog qhov tsim nyog los kho raws li cov kev mob tshwj xeeb thiab cov khoom lag luam kom tau ruaj khov thiab txhim khu kev qha ntawm cov khoom kawg.
Lub Sijhawm Post: Feb-17-2025