EPS granular thermal rwb thaiv tsev mortar yog ib lub teeb yuag thermal rwb thaiv tsev cov khoom sib xyaw nrog cov khoom siv hauv cov khoom siv, cov organic binder, admixture, admixture thiab lub teeb aggregate nyob rau hauv ib qho kev faib ua feem. Hauv kev tshawb fawb tam sim no thiab daim ntawv thov ntawm EPS particle rwb thaiv tsev mortar, recyclable redispersible latex hmoov muaj kev cuam tshuam zoo rau kev ua haujlwm ntawm mortar thiab occupies ib feem ntawm tus nqi, yog li nws yeej ib txwm ua kom pom tseeb. Kev sib koom ua ke ntawm EPS particle thermal rwb thaiv tsev mortar sab nrauv phab ntsa thermal rwb thaiv tsev feem ntau yog los ntawm cov ntaub ntawv polymer, thiab nws cov khoom feem ntau yog vinyl acetate / ethylene copolymer. Hom polymer emulsion no tuaj yeem muab tshuaj tsuag kom qhuav kom tau txais cov hmoov latex redispersible. Vim qhov kev npaj ntawm cov kua roj hmab respersible latex hauv kev tsim kho, kev thauj mus los yooj yim thiab kev khaws cia yooj yim, cov hmoov xoob xoob rau cov polymers tau dhau los ua ib qho kev txhim kho vim nws qhov kev npaj meej, kev thauj mus los yooj yim thiab khaws cia yooj yim. Qhov kev ua tau zoo ntawm EPS particle rwb thaiv tsev mortar yog nyob ntawm ntau yam ntawm cov khoom siv thiab cov khoom siv polymer. Ethylene-vinyl acetate latex hmoov (EVA) nrog cov ntsiab lus ethylene siab thiab tsis tshua muaj Tg (iav hloov kub) tus nqi muaj cov khoom zoo dua ntawm kev cuam tshuam lub zog, daim ntawv cog lus lub zog thiab dej tsis kam.
Kev ua kom zoo ntawm kev ua tau zoo ntawm redispersible latex hmoov ntawm mortar yog vim lub fact tias cov hmoov polymer yog ib tug siab molecular polymer nrog polar pawg. Thaum RDP sib xyaw nrog EPS hais, ntu tsis yog-polar nyob rau hauv cov saw tseem ceeb ntawm cov hmoov polymer yuav lub cev adsorb nrog cov tsis-polar nto ntawm EPS. Cov pawg polar hauv cov polymer yog taw qhia sab nraud ntawm EPS cov khoom, ua rau EPS cov khoom hloov ntawm hydrophobic mus rau hydrophilic. Vim yog kev hloov kho ntawm qhov chaw ntawm EPS cov khoom los ntawm cov hmoov polymer, qhov teeb meem uas EPS cov khoom yog yooj yim kom tau raws li dej yog daws. Floating, loj teeb meem ntawm mortar delamination. Lub sijhawm no, thaum ntxiv cov cement thiab nplawm, cov pawg polar adsorbed rau ntawm qhov chaw ntawm EPS cov khoom sib cuam tshuam nrog cov cement hais thiab sib xyaw ua ke, uas ua rau txhim kho kev ua haujlwm ntawm EPS rwb thaiv tsev mortar. Qhov no tau tshwm sim nyob rau hauv qhov tseeb hais tias EPS hais tau yooj yim wetted los ntawm cov cement slurry, thiab lub zog sib txuas ntawm ob qho kev txhim kho zoo heev.
Tom qab cov emulsion thiab redispersible latex hmoov yog tsim rau hauv ib zaj duab xis, lawv tuaj yeem tsim lub zog tensile siab dua thiab kev sib txuas ntawm cov khoom sib txawv. Lawv yog siv los ua tus thib ob binder nyob rau hauv mortar los ua ke nrog inorganic binder cement, cement thiab polymer feem. Ua si lub zog sib xws thiab txhim kho kev ua haujlwm ntawm cov tshuaj khib. Los ntawm kev soj ntsuam lub microstructure ntawm cov khoom siv polymer-cement composite, nws tau txiav txim siab tias qhov sib ntxiv ntawm redispersible latex hmoov tuaj yeem ua rau cov yeeb yaj kiab polymer ua ib feem ntawm lub qhov phab ntsa, thiab ua rau cov mortar tsim tag nrho los ntawm kev quab yuam sab hauv, uas txhim kho lub zog sab hauv ntawm mortar. Polymer lub zog, yog li ua rau tsis ua hauj lwm kev nyuaj siab ntawm lub mortar thiab ua rau qhov kawg strain. Txhawm rau kawm txog kev ua haujlwm ntev ntawm redispersible latex hmoov nyob rau hauv mortar, soj ntsuam los ntawm scanning electron microscope, tom qab 10 xyoo, lub microstructure ntawm polymer nyob rau hauv lub mortar tsis tau hloov, tuav ruaj khov, flexural zog thiab compressive zog raws li zoo raws li hydrophobic. Noj redispersible latex hmoov raws li cov khoom tshawb fawb, kev tsim cov txheej txheem ntawm cov pobzeb sib txuas lub zog tau kawm, thiab nws tau pom tias tom qab cov polymer tau qhuav rau hauv zaj duab xis, cov yeeb yaj kiab polymer tsim ib qho kev sib txuas ntawm cov tshuaj khib thiab cov nplais ntawm ib sab, thiab ntawm qhov tod tes, cov polymers nyob rau hauv mortar nce cua cov ntsiab lus ntawm mortar, cuam tshuam rau lub substrate txheej txheem thiab peb. kuj muaj txiaj ntsig zoo rau cov txheej txheem hydration thiab shrinkage ntawm cov cement. Adhesives, tag nrho cov no pab kom muaj zog daim ntawv cog lus.
Ntxiv cov hmoov latex redispersible rau cov tshuaj khib tuaj yeem txhim kho lub zog sib txuas nrog lwm cov ntaub ntawv, vim tias cov kua theem ntawm hydrophilic polymer hmoov thiab cement suspension nkag mus rau hauv lub pores thiab capillaries ntawm cov matrix, thaum cov hmoov latex nkag mus rau hauv lub qhov hws thiab hauv capillary. Cov zaj duab xis sab hauv yog tsim thiab khov kho adsorbed rau ntawm qhov chaw ntawm lub substrate, yog li ua kom muaj kev sib txuas zoo ntawm cov khoom siv gelled thiab cov substrate.
Post lub sij hawm: Jun-16-2023