1. Taw qhia
Polystyrene particle rwb thaiv tsev mortar yog cov khoom siv feem ntau siv rau kev tsim cov phab ntsa sab nrauv. Nws muab cov txiaj ntsig zoo ntawm cov khoom siv polystyrene (EPS) thiab cov tshuaj mortar, muab cov txiaj ntsig zoo rwb thaiv tsev thiab cov khoom siv kho tshuab. Txhawm rau txhawm rau txhim kho nws cov kev ua tau zoo, tshwj xeeb tshaj yog txhawm rau txhim kho nws cov adhesion, tawg tsis kam thiab kev tsim kho, redispersible latex hmoov (RDP) feem ntau ntxiv. RDP yog ib tug polymer emulsion nyob rau hauv hmoov daim ntawv uas yuav tsum tau redispersed nyob rau hauv dej.
2. Txheej txheem cej luam ntawm redispersible latex hmoov (RDP)
2.1 Txhais thiab cov khoom
Redispersible latex hmoov yog cov hmoov ua los ntawm cov tshuaj tsuag kom qhuav ib lub polymer emulsion tau los ntawm emulsion polymerization. Nws tuaj yeem hloov pauv hauv dej los tsim cov emulsion ruaj khov nrog cov yeeb yaj kiab zoo thiab ua kom muaj zog. Feem ntau RDPs suav nrog ethylene-vinyl acetate copolymer (EVA), acrylate copolymer thiab styrene-butadiene copolymer (SBR).
2.2 Lub luag haujlwm tseem ceeb
RDP tau dav siv hauv cov khoom siv hauv tsev thiab muaj cov haujlwm hauv qab no:
Txhim khu adhesion: Muab kev ua tau zoo adhesion, ua kom muaj kev sib raug zoo ntawm mortar thiab substrate, mortar thiab polystyrene hais kom muaj zog.
Txhim kho qhov tawg tsis kam: Txhim kho qhov tawg tsis kam ntawm mortar los ntawm kev tsim cov yeeb yaj kiab polymer hloov tau.
Txhim kho kev tsim kho kev ua haujlwm: Ua kom yooj yim thiab kev tsim kho fluidity ntawm mortar, yooj yim rau kev sib kis thiab qib.
Txhim kho dej tsis kam thiab khov-thaw tsis kam: Txhim kho cov dej tsis kam thiab khov-thaw lub voj voog tiv thaiv ntawm mortar.
3. Kev siv RDP hauv polystyrene particle rwb thaiv tsev mortar
3.1 Txhim kho kev sib raug zoo
Hauv polystyrene particle rwb thaiv tsev mortar, adhesion yog ib qho tseem ceeb ua haujlwm. Txij li cov khoom siv polystyrene lawv tus kheej yog cov khoom siv hydrophobic, lawv yooj yim poob tawm ntawm cov tshuaj khib matrix, ua rau tsis ua haujlwm ntawm lub rwb thaiv tsev. Tom qab ntxiv RDP, cov zaj duab xis polymer tsim nyob rau hauv mortar tuaj yeem npog qhov chaw ntawm polystyrene hais, ua rau thaj chaw sib txuas ntawm lawv thiab cov mortar matrix, thiab txhim kho lub zog sib txuas.
3.2 Enhanced crack resistance
Cov yeeb yaj kiab polymer tsim los ntawm RDP muaj qhov hloov pauv tau yooj yim thiab tuaj yeem tsim cov qauv mesh hauv mortar los tiv thaiv kev nthuav dav ntawm cov kab nrib pleb. Cov yeeb yaj kiab polymer kuj tuaj yeem nqus tau qhov kev ntxhov siab los ntawm cov rog sab nraud, yog li tiv thaiv cov kab nrib pleb los ntawm thermal expansion thiab contraction lossis shrinkage.
3.3 Txhim kho kev tsim kho kev ua haujlwm
Polystyrene particle rwb thaiv tsev mortar yog qhov ua rau cov dej tsis zoo thiab nyuaj rau kev sib kis thaum tsim kho. Qhov sib ntxiv ntawm RDP tuaj yeem txhim kho qhov fluidity thiab kev ua haujlwm ntawm lub mortar, ua rau lub mortar yooj yim rau kev tsim thiab txhim kho kev tsim kho. Tsis tas li ntawd, RDP kuj tseem tuaj yeem txo qhov kev sib cais ntawm cov tshuaj khib thiab ua rau kev faib cov tshuaj khib nyiab ntau dua.
3.4 Txhim kho dej tsis kam thiab kav ntev
Polystyrene particle rwb thaiv tsev mortar yuav tsum muaj cov dej tsis zoo hauv kev siv mus sij hawm ntev los tiv thaiv cov dej nag los ntawm eroding txheej rwb thaiv tsev. RDP tuaj yeem tsim cov txheej txheem hydrophobic hauv mortar los ntawm nws cov yeeb yaj kiab tsim cov khoom, tiv thaiv kom tsis txhob ya raws nkag mus rau hauv mortar. Tsis tas li ntawd, cov yeeb yaj kiab hloov pauv tau muab los ntawm RDP kuj tuaj yeem txhim kho cov tshuaj khib nyiab los tiv thaiv khov thiab thaw thiab txuas ntxiv lub neej kev pab cuam ntawm rwb thaiv tsev mortar.
4. Mechanism ntawm kev ua
4.1 Film-forming effect
Tom qab RDP yog redispersed nyob rau hauv dej nyob rau hauv lub mortar, cov polymer hais maj mam sib koom ua ke rau hauv ib tug mus tsim ib tug nruam polymer zaj duab xis. Cov yeeb yaj kiab no tuaj yeem kaw cov qhov hws me me hauv cov tshuaj khib nyiab, tiv thaiv kev nkag mus ntawm cov dej noo thiab cov khoom tsis zoo, thiab txhim kho lub zog sib txuas ntawm cov khoom.
4.2 Txhim kho qhov cuam tshuam interface
Thaum lub sij hawm hardening txheej txheem ntawm mortar, RDP tuaj yeem txav mus rau qhov sib cuam tshuam ntawm cov mortar thiab cov khoom siv polystyrene los tsim ib txheej txheej. Cov zaj duab xis polymer no muaj zog adhesion, uas tuaj yeem txhim kho lub zog sib txuas ntawm cov khoom siv polystyrene thiab mortar matrix thiab txo cov tiam ntawm cov kab nrib pleb.
4.3 Txhim kho yooj
Los ntawm kev tsim ib qho kev hloov pauv hauv lub mortar, RDP ua rau kom tag nrho cov kev hloov pauv ntawm cov tshuaj khib nyiab. Qhov kev hloov pauv tau yooj yim no tuaj yeem cuam tshuam kev ntxhov siab sab nraud thiab txo qis kev ntxhov siab, yog li txhim kho qhov tawg tsis kam thiab ua haujlwm ntev ntawm cov tshuaj khib nyiab.
5. Cov nyhuv ntawm RDP ntxiv
5.1 Tsim nyog tus nqi ntxiv
Tus nqi ntawm RDP ntxiv muaj qhov cuam tshuam loj rau kev ua haujlwm ntawm polystyrene particle rwb thaiv tsev mortar. Feem ntau, tus nqi ntawm RDP ntxiv yog nyob nruab nrab ntawm 1-5% ntawm tag nrho cov khoom siv cementitious. Thaum cov nyiaj ntxiv yog nruab nrab, nws tuaj yeem txhim kho lub zog sib txuas, tawg ua haujlwm thiab kev tsim kho ntawm cov mortar. Txawm li cas los xij, kev sib ntxiv ntau dhau tuaj yeem ua rau tus nqi nce ntxiv thiab cuam tshuam rau qhov hardness thiab compressive zog ntawm mortar.
5.2 Kev sib raug zoo ntawm tus nqi ntxiv thiab kev ua haujlwm
Daim ntawv cog lus muaj zog: Raws li tus nqi ntawm RDP ntxiv nce, lub zog sib txuas ntawm cov mortar maj mam nce, tab sis tom qab ncav cuag ib qho kev faib ua feem, cov txiaj ntsig ntawm kev nce ntxiv ntawm cov nyiaj ntxiv rau kev txhim kho ntawm kev sib koom ua ke yog txwv.
Kev tiv thaiv kev sib tsoo: Ib qho tsim nyog ntawm RDP tuaj yeem txhim kho qhov tawg ntawm cov tshuaj khib nyiab, thiab qhov sib ntxiv me me los yog ntau dhau yuav cuam tshuam rau nws cov txiaj ntsig zoo.
Kev tsim kho kev ua haujlwm: RDP txhim kho cov dej ntws thiab kev ua haujlwm ntawm cov mortar, tab sis kev sib ntxiv ntau dhau yuav ua rau cov mortar ua kom khov heev, uas tsis tsim nyog rau kev tsim kho.
6. Kev siv tau thiab siv tau
6.1 Kev tsim kho rooj plaub
Nyob rau hauv qhov tseeb tej yaam num, RDP yog dav siv nyob rau hauv sab nrauv rwb thaiv tsev systems (EIFS), plaster mortars thiab bonding mortars. Piv txwv li, nyob rau hauv sab nrauv phab ntsa rwb thaiv tsev ntawm ib tug loj coj mus muag complex, los ntawm kev ntxiv 3% RDP rau cov polystyrene particle rwb thaiv tsev mortar, kev tsim kho kev ua tau zoo thiab rwb thaiv tsev nyhuv ntawm lub mortar yog ho txhim kho, thiab cov kev pheej hmoo ntawm tawg thaum lub sij hawm tsim kho. txo tau zoo.
6.2 Kev soj ntsuam xyuas
Txoj kev tshawb nrhiav pom tau hais tias cov polystyrene particle rwb thaiv tsev mortar nrog ntxiv ntawm RDP muaj kev txhim kho tseem ceeb hauv kev sib txuas ntawm lub zog, compressive zog thiab tawg tsis kam ntawm 28 hnub. Piv nrog rau cov qauv tswj tsis muaj RDP, lub zog sib txuas ntawm RDP-ntxiv cov qauv tau nce los ntawm 30-50% thiab qhov tawg tsis kam nce 40-60%.
Redispersible latex hmoov (RDP) muaj ib qho tseem ceeb daim ntawv thov nqi nyob rau hauv polystyrene particle rwb thaiv tsev mortar. Nws ua tau zoo txhim kho cov kev ua tau zoo ntawm cov rwb thaiv tsev mortar los ntawm kev txhim kho kev sib raug zoo, txhim kho kev tawg, txhim kho kev tsim kho, thiab txhim kho dej tsis kam thiab kav ntev. Hauv kev siv cov tswv yim, qhov tsim nyog ntxiv ntawm RDP tuaj yeem txhim kho qhov ruaj khov thiab ua haujlwm ntev ntawm cov rwb thaiv tsev, muab qhov tseem ceeb lav rau kev txuag hluav taws xob thiab kev nyab xeeb ntawm cov qauv.
Post lub sij hawm: Jun-19-2024