Redispersible polymer hmoov (RDPs) ua lub luag haujlwm tseem ceeb hauv ntau yam kev lag luam, suav nrog kev tsim kho, nplaum, thiab txheej txheej. Cov hmoov no tau dav siv los txhim kho cov khoom ntawm cov khoom siv cementitious, txhim kho adhesion, yooj, thiab durability. Nkag siab txog cov txheej txheem tsim khoom ntawm RDPs yog qhov tseem ceeb rau cov tuam txhab tsim khoom kom ntseeg tau cov khoom zoo.
Raw Khoom:
Kev tsim cov respersible polymer hmoov pib nrog ua tib zoo xaiv cov ntaub ntawv raw uas cuam tshuam cov khoom ntawm cov khoom kawg. Cov khoom tseem ceeb muaj xws li polymer resins, tiv thaiv colloids, plasticizers, thiab ntau yam additives.
Polymer Resins: Ethylene-vinyl acetate (EVA), vinyl acetate-ethylene (VAE), thiab acrylic polymers feem ntau yog siv los ua lub ntsiab polymer resins. Cov resins no muab adhesion, yooj, thiab dej tsis kam rau RDPs.
Kev Tiv Thaiv Colloids: Hydrophilic tiv thaiv colloids xws li polyvinyl cawv (PVA) los yog cellulose ethers yog ntxiv rau stabilize cov polymer hais thaum ziab thiab khaws cia, tiv thaiv kev sib sau.
Plasticizers: Plasticizers txhim kho qhov yooj thiab ua haujlwm ntawm RDPs. Cov plasticizers feem ntau suav nrog glycol ethers lossis polyethylene glycols.
Additives: Ntau yam additives xws li dispersants, thickeners, thiab cross-linking agents yuav raug muab tso ua ke los txhim kho cov khoom tshwj xeeb xws li dispersibility, rheology, lossis mechanical zog.
Txheej txheem txheej txheem:
Kev tsim cov khoom siv rov ua dua tshiab ntawm cov hmoov polymer muaj ntau yam kev ua haujlwm nyuaj, suav nrog emulsion polymerization, tshuaj tsuag kom qhuav, thiab cov txheej txheem tom qab kho.
Emulsion Polymerization:
Cov txheej txheem pib nrog emulsion polymerization, qhov twg monomers, dej, emulsifiers, thiab cov pib sib xyaw hauv lub reactor nyob rau hauv kev tswj ntawm qhov kub thiab txias. Cov monomers polymerize los tsim cov khoom latex dispersed hauv dej. Cov kev xaiv ntawm monomers thiab cov tshuaj tiv thaiv tej yam kev mob txiav txim siab cov polymer muaj pes tsawg leeg thiab cov khoom.
Stabilization thiab coagulation:
Tom qab polymerization, cov latex tau stabilization los ntawm kev ntxiv cov tshuaj tiv thaiv colloids thiab stabilizers. Cov kauj ruam no tiv thaiv particle coagulation thiab ua kom ruaj khov ntawm cov latex dispersion. Coagulation cov neeg ua hauj lwm yuav raug qhia kom induce tswj coagulation ntawm latex hais, tsim ib tug ruaj khov coagulum.
Txau kom qhuav:
Lub stabilized latex dispersion yog ces muab tso rau hauv lub tshuab ziab khaub ncaws. Nyob rau hauv cov tshuaj tsuag kom qhuav chamber, cov dispersion yog atomized rau hauv me me droplets siv high-pressure nozzles. Cua kub yog ib txhij qhia kom evaporate cov ntsiab lus dej, tawm hauv qab cov khoom polymer hais. Cov huab cua qhuav, suav nrog huab cua kub, lub sijhawm nyob, thiab huab cua ntws, cuam tshuam rau cov khoom morphology thiab hmoov.
Kev Kho Mob Tom Qab:
Tom qab cov tshuaj tsuag kom qhuav, cov hmoov polymer uas tau txais cov txheej txheem tom qab kho los txhim kho nws cov kev ua tau zoo thiab kev ruaj khov. Cov txheej txheem no yuav suav nrog kev hloov kho saum npoo, granulation, thiab ntim khoom.
a. Kev Hloov Kho Nto: Cov neeg ua haujlwm saum npoo av lossis cov neeg sib txuas sib txuas tuaj yeem raug siv los hloov kho cov khoom ntawm cov khoom siv polymer, txhim kho lawv cov dispersibility thiab compatibility nrog lwm cov ntaub ntawv.
b. Granulation: Txhawm rau txhim kho kev tuav thiab dispersibility, cov hmoov polymer yuav dhau los ua granulation los tsim cov khoom me me thiab txo cov hmoov av.
c. Ntim: RDPs zaum kawg tau ntim rau hauv cov thawv ntim dej noo kom tiv thaiv kom tsis txhob ya raws thiab ua kom lawv ruaj khov thaum khaws cia thiab thauj mus los.
Kev Tswj Xyuas Zoo:
Kev tswj kom zoo yog qhov tseem ceeb thoob plaws hauv cov txheej txheem tsim khoom kom ntseeg tau tias muaj kev sib luag thiab kev ntseeg siab hauv cov khoom ntawm cov khoom siv rov ua dua tshiab polymer hmoov. Ob peb qhov tseem ceeb tsis raug saib xyuas thiab tswj tau ntawm ntau theem:
Raw Khoom Zoo: Kev tshuaj xyuas zoo thiab kuaj cov ntaub ntawv raw, suav nrog cov polymers, colloids, thiab additives, yog ua los xyuas lawv qhov zoo, purity, thiab compatibility nrog rau daim ntawv thov.
Kev Saib Xyuas Txheej Txheem: Cov txheej txheem tseem ceeb xws li cov tshuaj tiv thaiv kub, siab, monomer pub tus nqi, thiab kev ziab kom qhuav tau raug saib xyuas thiab kho kom zoo thiab sib xws.
Particle Characterization: Particle loj tis, morphology, thiab nto thaj chaw ntawm cov hmoov polymer yog soj ntsuam siv cov tswv yim xws li laser diffraction, electron microscopy, thiab deg cheeb tsam tsom xam.
Kev Ntsuam Xyuas Kev Ua Haujlwm: Cov khoom siv hluav taws xob hloov pauv tau dhau los ua qhov kev ntsuas kev ua tau zoo los ntsuas lawv lub zog nplaum, tsim zaj duab xis, dej tsis kam, thiab cov khoom siv kho tshuab raws li cov qauv kev lag luam thiab cov neeg siv khoom.
Kev Ntsuam Xyuas Kev Ruaj Ntseg: Kev ntsuas kev laus nrawm thiab kev tshawb fawb txog kev ruaj ntseg yog ua los ntsuas qhov kev ruaj ntseg mus ntev ntawm RDPs nyob rau hauv ntau yam kev cia khoom, suav nrog qhov kub thiab txias hloov pauv.
Kev tsim cov khoom siv rov ua dua tshiab ntawm cov hmoov polymer muaj feem ntau ntawm cov kauj ruam, los ntawm emulsion polymerization mus rau tshuaj tsuag kom qhuav thiab cov txheej txheem tom qab kho. Los ntawm kev ua tib zoo tswj cov ntaub ntawv raw, kev ua haujlwm tsis zoo, thiab kev tswj xyuas zoo, cov tuam txhab tsim khoom tuaj yeem ua kom muaj kev sib raug zoo thiab kev ua tau zoo ntawm RDPs rau ntau yam kev siv hauv kev tsim kho, nplaum, thiab coatings industries. To taub qhov intricacies ntawm cov txheej txheem ntau lawm yog qhov tseem ceeb rau optimizing cov yam ntxwv ntawm cov khoom thiab ua tau raws li cov kev xav tau ntawm cov neeg muas zaub nyob rau hauv lub lag luam.
Post lub sij hawm: Mar-12-2024