Redispersible looj hmoov (RDP) yog ib qho tseem ceeb qhuav ntxiv siv los txhim kho kev ua tau zoo ntawm cov tshuaj khib nyiab qhuav. Nws lub hauv paus kev ua haujlwm yog feem ntau yog txhim kho cov khoom tseem ceeb ntawm cov nplaum, yoog raws cov txheej txheem xws li dispersion, Zaj duab xis tsim thiab hla kev sib txuas.
1. Kev Tshaj Tawm Kev Sib Tham
RDP feem ntau muaj nyob rau hauv daim ntawv ntawm cov hmoov nplej hauv qhuav-tov cug, xws li txheej ntawm kev tiv thaiv polyvinyl (pva), kom muaj lub xeev ruaj khov. Tom qab ntxiv cov dej, kev tiv thaiv kev tiv thaiv hauv cov hmoov txhuas sai sai pib tsim cov roj av siab ua kom cov dej khov. Txoj kev rho tawm no yog qhov zoo ib yam li cov emulsions, tab sis nws cov yam ntxwv yog tias los ntawm kev co dej, RDP tuaj yeem xa rov qab sai sai rau lub xeev emulsions. Los ntawm kev faib tawm, RDP tuaj yeem faib covyees thoob plaws lub cug lub kaw lus, yog li txhim kho cov nplaum thiab anti-delamination ua tau zoo ntawm substrates.
2. Zaj duab xis-tsim txheej txheem
Thaum lub sij hawm cov txheej txheem signification ntawm cov cement lossis lwm cov ntaub ntawv inorganic, cov emulsion cov lus dispersed los ntawm RDP yuav maj mam poob dej. Thaum cov dej yaj tag nrho, cov polymer hais tawg los ntawm RDP sib sau ua ke los ua cov yeeb yaj kiab txuas ntxiv polymer. Cov yeeb yaj kiab polymer no ua yeeb yaj kiab "Bridging" lub luag haujlwm hauv cov hmoov nplej cais, nplua cov hmoov av, txhim kho cov zog ntawm lub zog. Daim txheej no ntawm polymer zaj duab xis muaj qee yam hloov tau thiab muaj zog, thiab tuaj yeem hloov kho cov kab cug cov kab cug. Tsis tas li ntawd, cov yeeb yaj kiab polymer tseem tuaj yeem thaiv cov micro-pores nyob rau hauv cov qauv hauv paus, thiab txhim kho cov dej tsis kam thiab ua kom zoo dua ntawm cov tshuaj khib.
3. Molecular qauv thiab txhawb nqa lub zog
Cov polymer lub ntsiab ntawm RDP feem ntau yog raws li monomers xws li ethylene acetate (Ethylene acetate (EVA) lossis acrylate, thiab muaj kev yooj yim heev thiab ua kom zoo nkauj. Thaum cov copolymers tsim los ntawm cov monomers tau qhuav thiab dispersed, lawv tuaj yeem tsim cov polymer ruaj khov hauv dej thiab nws thiaj li ua cov yeeb yaj kiab txuas ntxiv. Cov qauv no muaj cov nplaum nplaum muaj zog thiab muaj peev xwm ua cov kab cug uas ua kom zoo dua qub, txhim kho nws cov kev cuam tshuam tsis kam, cuam tshuam nrog ruaj khov. Los ntawm kev kho cov monomer piv, kev ua yeeb yam ntawm cov hmoov yas tau hloov kho hauv kev taw qhia kom tau raws li cov kev xav tau ntawm cov ntawv sau cug.
4. Txhim kho cov nyhuv hloov kho
RDP qhia cov txiaj ntsig tseem ceeb hauv cov tshuaj khib nyiab qhuav, uas yog feem ntau xav txog hauv cov hauv qab no:
Txhim kho kev sib raug zoo: Tom qab RDP yog ua yeeb yaj kiab, cov yeeb yaj kiab polymer tuaj yeem tsim kev kos duab lub cev, uas ua rau lub cev sib xyaw ua ke ntawm cov tshuaj khib thiab cov substrate. Tshwj xeeb tshaj yog thaum siv los ua tus neeg sawv cev ntawm tus neeg sab hauv thiab cov nyhuv vuas, cov nyhuv ntawm kev txhim kho txoj kev sib raug zoo yog pom tseeb.
Txhim kho kom tau zoo thiab tawg tsis kam: lub polymer zaj duab xis tom qab RDP kev ntxhov siab los ntawm kev sib tsoo sab nraud, thiab tuaj yeem txo qhov kev ntxhov siab sab nraud lossis kho kom huv, thiab txhim kho cov kab tsuag tsis kam ntawm cov cap.
Txhim kho cov dej tsis kam: cov yeeb yaj kiab polymer muaj cov nyhuv dej paug, uas tuaj yeem txo cov dej tsis kam ntawm cov dej cug. Yog li ntawd, RDP yog dav siv nyob rau hauv mortars nrog cov dej tsis kam, xws li cov tshuaj khib nyiab thiab cov dej txaws.
Txhim kho cov hnav tsis kam thiab cov yeeb yaj kiab polymer muaj cov coj zoo, uas tuaj yeem txhim kho cov tshuaj khib nyiab thiab cuam tshuam nws lub neej kev pabcuam. RDP-Modififified copure Qhia muaj cov kev tiv thaiv muaj zog nyob rau sab nraum zoov ntev, txo ib puag ncig kev puas tsuaj rau tshuaj khib.
5. Kev ua haujlwm txhim kho thiab kev thov
Daim ntawv thov ntawm RDP nyob rau hauv colph tau nthuav dav heev siv cov xwm txheej ntawm cug cug. Vim nws cov teeb meem tseem ceeb hauv kev txhim kho kev sib xyaw ua kom muaj zog thiab cov khoom sib xyaw ua ke, kev txhim kho cov nplaum, cov kab mob rwb thaiv tsev thiab kho cov khoom lag luam. Rwb thaiv tsev sab nrauv phab ntsa rwb thaiv tsev, sab hauv tsev thiab sab nraum zoov cov phiaj xwm, RDP tau dhau los ua ib qho ntawm cov khoom tseem ceeb.
6. Yav Tom Ntej Kev Loj Hlob
Nrog rau kev txhim kho ntawm kev tsim kho kev tsim kho, qhov kev thov rau ntsuab, ib puag ncig kev ua phooj ywg thiab kev ua kom muaj zog ntawm RDP hauv cov khoom noj muaj sib xyaw kom ruaj khov. Tam sim no, ib puag ncig phooj ywg, qis dua vocist organic compound) emission looj hmoov yog ua lub zog ntawm kev ua lag luam. Tshwj xeeb tshaj yog nyob rau hauv txoj kev txhim kho kev loj hlob thiab cov peev txheej kev txhim kho, RDP, uas maj mam ua qhov chaw kub hauv kev ua lag luam. Tsis tas li ntawd, kev txhim kho RDP cov khoom lag luam muaj huab cua siab ntxiv thiab muaj zog nplaum kom tau raws li kev nyab xeeb huab cua kuj tau dhau los ua kev tshawb fawb yav tom ntej.
RDP tau txais txiaj ntsig zoo dua, yooj yim, dej tsis kam thiab cuam tshuam los ntawm dispersing, zaj duab xis-forming thiab ntxiv dag zog rau cov qauv hauv lub cug lub kaw lus.
Lub sijhawm Post: Feb-15-2025