Txhawm rau txhim kho lub brittleness thiab siab elastic modulus ntawm tsoos cement mortar hauv mortar, feem ntau nws yog ib qho tsim nyog yuav tsum tau ntxiv cov hmoov latex redispersible raws li ib qho ntxiv, uas tuaj yeem muab cov cement mortar zoo elasticity thiab tensile zog. Txhawm rau tiv thaiv thiab ncua kev tsim cov cement mortar tawg, vim hais tias cov polymer thiab mortar tsim ib qho kev sib cuam tshuam network qauv, ib tug nruam polymer zaj duab xis yog tsim nyob rau hauv lub qhov hws, uas ntxiv dag zog rau kev sib raug zoo ntawm aggregates thiab blocks qhov chaw nyob rau hauv lub mortar Pores, yog li cov hloov. mortar tom qab hardening tau zoo heev kev ua tau zoo dua li cement mortar.
Cov hmoov latex yog tsim los ntawm qhov kub thiab txias, kev kub siab, tshuaj tsuag kom qhuav thiab homopolymerization nrog ntau yam active reinforcing micropowders, uas tuaj yeem txhim kho lub peev xwm thiab tensile lub zog ntawm mortar, thiab muaj kev tsim kho zoo ntawm kev tiv thaiv kev poob, dej tuav thiab thickening. , dej tsis kam thiab khov-thaw kuj, Zoo heev thaum tshav kub kub aging kuj, yooj yim cov khoom xyaw, yooj yim mus use. Xindadi latex hmoov muaj kev sib raug zoo nrog cov cement, tuaj yeem ua tiav hauv cov cement-raws li cov khoom sib xyaw qhuav, tsis txo lub zog ntawm cov cement tom qab kho, tsis tsuas yog tswj cov adhesion zoo heev, zaj duab xis-tsim zog thiab yoog raws, tab sis kuj muaj qhov zoo. Huab cua tsis kam, ruaj khov, kev sib txuas ua haujlwm thiab tawg ua haujlwm. Tom qab ziab, nws tuaj yeem tiv thaiv kev yaig ntawm cov pa acidic ntawm phab ntsa, thiab nws tsis yooj yim rau pulverize thiab deliquesce tom qab ntub dej. Nws tuaj yeem txhim kho lub zog ntawm cov khoom. Ntxiv cov hmoov latex redispersible rau putty hmoov thiab mortar tuaj yeem ua rau nws lub zog, thiab nws muaj txiaj ntsig zoo los txhim kho cov tawv tawv. Nws muaj qhov ua tau zoo ntawm cov dej tsis zoo, kev sib txuas zoo zog, tuaj yeem ua kom lub zog ntawm cov tshuaj khib nyiab thiab muaj lub sijhawm qhib ntev dua, thiab muab cov tshuaj khib nrog cov alkali tiv thaiv zoo, thiab tuaj yeem txhim kho cov adhesion / adhesiveness thiab flexural tsis kam ntawm mortar. Ntxiv nrog rau lub zog, hnav tsis kam thiab kev tsim kho, nws muaj zog ua kom yooj yim hauv cov tshuaj tiv thaiv kev sib tsoo.
Raws li kev hais lus, cov hmoov latex nrog lub khob hloov pauv kub hauv qab 5 ° C yog qhov hloov tau yooj yim dua thiab feem ntau yog siv rau sab nrauv phab ntsa rwb thaiv tsev mortar, thiab cov hmoov latex nrog iav hloov kub siab tshaj 10 ° C yog tsuas yog siv rau hauv cov nplaum thiab nws tus kheej-leveling. mortars.
Nyob ntawm seb muaj pes tsawg leeg ntawm mortar, daim ntawv thov kev ua tau zoo ntawm cov tshuaj khib kuj tseem yuav cuam tshuam los ntawm kev hloov pauv ntawm cov nyiaj ntxiv ntawm cov tshuaj respersible latex hmoov ntxiv: cov nyiaj ntxiv ntawm cov hmoov av redispersible latex tsawg dua 1%, uas muaj qee yam cuam tshuam. ntawm kev tsim kho thiab adhesion ntawm mortar; Qhov sib ntxiv ntawm redispersible latex hmoov yog 1, 2.0%, uas txhim kho lub zog, dej tsis kam thiab yoog raws ntawm mortar; qhov sib ntxiv ntawm redispersible latex hmoov yog 2.0, 5%, ua ib tug network polymer zaj duab xis nyob rau hauv mortar. Nyob rau hauv cov huab cua sib txawv thiab kev sib cuam tshuam, lub zog thiab yoog raws ntawm mortar yog pom tseeb txhim kho.
Nyob rau hauv cov ntaub ntawv ntawm high latex hmoov cov ntsiab lus, lub polymer theem nyob rau hauv lub kho mortar maj mam tshaj lub theem ntawm cov inorganic hydration khoom, thiab cov mortar tau txais ib tug zoo hloov thiab ua ib tug elastic lub cev, thaum cov khoom hydration ntawm cov cement los ua ib tug "filler. ”. Cov zaj duab xis tsim los ntawm redispersible latex hmoov faib nyob rau hauv lub interface plays lwm lub luag hauj lwm tseem ceeb, uas yog, txhim khu lub adhesion rau cov ntaub ntawv tiv tauj, uas yog haum rau ib co nyuaj-rau-stick nto, xws li tsis tshua muaj dej nqus los yog Non- Qhov chaw nqus dej (xws li cov pob zeb du thiab cov khoom siv cement, cov phaj hlau, cov cib sib xyaw ua ke, cov av ci ntsa iab, thiab lwm yam) thiab cov khoom siv organic (xws li EPS boards, plastics, thiab lwm yam) yog qhov tseem ceeb. Vim tias kev sib txuas ntawm cov khoom siv los ntawm cov khoom siv hluav taws xob yog ua tiav los ntawm lub hauv paus ntsiab lus ntawm kev siv tshuab, uas yog, hydraulic slurry nkag mus rau hauv qhov khoob ntawm lwm cov ntaub ntawv, maj mam solidifies, thiab thaum kawg tuav lub mortar zoo li tus yuam sij embedded rau hauv lub xauv. . Nyob rau saum npoo ntawm cov khoom, rau saum npoo nyuaj-rau-bond nto, vim qhov tsis muaj peev xwm nkag mus rau hauv cov khoom siv los tsim cov khoom siv zoo, cov tshuaj khib nrog tsuas yog cov nplaum nplaum tsis zoo rau nws, thiab cov khoom siv hluav taws xob. microscope soj ntsuam kuj zoo heev. Nws ua pov thawj nws. Cov txheej txheem sib txuas ntawm cov polymers txawv. Polymers daim ntawv cog lus nrog rau saum npoo ntawm lwm cov ntaub ntawv los ntawm cov intermolecular rog, ywj siab ntawm lub porosity ntawm qhov chaw (ntawm chav kawm, ib tug ntxhib nto thiab ib tug nce kev sib cuag saum npoo yuav txhim kho lub sib raug zoo quab yuam), uas yog pom tseeb dua nyob rau hauv cov ntaub ntawv ntawm cov organic substrates, thiab kev soj ntsuam ntawm electron microscopes kuj proves lub superiority ntawm nws nplaum quab yuam.
Cov hmoov latex hloov qhov sib xws thiab slipperiness ntawm lub kaw lus nyob rau hauv lub ntub sib tov lub xeev, thiab cov cohesion yog zoo dua los ntawm kev ntxiv latex hmoov. Tom qab ziab, nws muab cov txheej txheem du thiab ntom ntom nrog lub zog cohesive, thiab txhim kho cov nyhuv cuam tshuam ntawm cov xuab zeb, gravel thiab pores. , enriched rau hauv ib zaj duab xis ntawm lub interface, uas ua rau cov pobzeb nplaum ntau saj zawg zog, txo cov elastic modulus, absorbs thermal deformation kev nyuaj siab mus rau ib tug loj npaum li cas, thiab muaj dej kuj nyob rau hauv lub tom ntej theem, thiab tsis kub thiab khoom deformation yog inconsistent. . Qhov yooj thiab rigidity ntawm latex hmoov feem ntau yuav raug txiav txim raws li lub iav hloov kub. Yog tias cov iav hloov pauv kub qis dua 0 degrees, nws hloov tau yooj yim dua. Yam twg ntawm cov hmoov latex xav tau nyob rau hauv mortar feem ntau txiav txim siab raws li qhov ua tau zoo ntawm cov khoom. Cov nplaum nplaum yuav tsum siv cov hmoov latex nrog adhesion zoo dua.
Post lub sij hawm: Mar-14-2023