Redispersible Polymer Powder (RDP) yog cov hmoov polymer uas tuaj yeem hloov pauv hauv dej los tsim cov emulsion ruaj khov. Nws yog feem ntau siv rau hauv cov khoom siv cement xws li qhuav-siv mortar. Nws cov khoom tseem ceeb feem ntau yog ethylene-vinyl acetate copolymer (EVA), styrene-acrylate copolymer, thiab lwm yam. Vim hais tias redispersible latex hmoov muaj zoo dispersion, adhesion thiab film-forming zog, nws plays ib tug tseem ceeb luag hauj lwm nyob rau hauv cov cement-based systems. Tshwj xeeb tshaj yog cov nplaum, nws cov kev ua tau zoo ntawm ntau qhov kev txhim kho tseem ceeb txhim kho cement-based systems. Cov khoom ua tau zoo thiab durability.
1. Txhim kho adhesion
Qhov adhesion ntawm cov ntaub ntawv cement-based yog qhov teeb meem tseem ceeb hauv kev tsim kho, thiab kev sib txuas ntawm cov khoom siv cement-based yog tsis muaj zog. Tshwj xeeb tshaj yog thaum siv rau cov substrates sib txawv, teeb meem xws li shedding thiab cracking yog feem ntau yooj yim tshwm sim. Redispersible latex hmoov yog siv los ua cov ntawv khi hauv cov cement-based systems, thiab nws cov txiaj ntsig tseem ceeb tshaj plaws yog txhawm rau txhim kho kev sib raug zoo zog.
Tom qab redispersible latex hmoov yog tov nrog cement mortar nyob rau hauv dej, nws muaj peev xwm tsim ib tug nruam polymer zaj duab xis nrog cov hais nyob rau hauv cov cement-based khoom. Cov yeeb yaj kiab zoo li no tsis yog tsuas yog muaj qhov adhesion zoo heev, tab sis kuj tseem tuaj yeem txhim kho cov kev sib cuam tshuam ntawm cov khoom siv hauv paus thiab cov cement, ua kom lub zog sib cuam tshuam, yog li txhim kho kev sib raug zoo ntawm cov khoom siv cement thiab ntau yam ntaub ntawv hauv paus. Nws tuaj yeem daws qhov teeb meem kev sib raug zoo ntawm cov khoom siv cement-based thiab du lossis qis dej-nqus substrates (xws li cov vuas ceramic, iav, thiab lwm yam).
2. Txhim kho qhov yooj yim thiab tawg tsis kam
Tom qab cov ntaub ntawv cement-based hardening, lawv feem ntau ua rau tawg vim lawv cov brittleness siab, tshwj xeeb tshaj yog nyob rau hauv kev cuam tshuam ntawm kub hloov thiab sab nraud quab yuam. Qhov tshwm sim tawg yuav pom tseeb dua. Cov yeeb yaj kiab tsim los ntawm cov khoom siv polymer hauv cov hmoov av rov ua dua tom qab hardening muaj qhov yooj yooj yim, tuaj yeem cuam tshuam kev ntxhov siab thiab txo qhov kev puas tsuaj rau cov khoom los ntawm sab nraud quab yuam, yog li txhim kho qhov yooj thiab tawg tsis kam ntawm cov khoom siv cement.
Tom qab ib co ntawm cov redispersible latex hmoov yog tov rau hauv cov cement-raws li cov ntaub ntawv, lub toughness ntawm cov khoom yog ho txhim khu kev qha, uas yuav ua tau ib tug buffering lub luag hauj lwm nyob rau hauv kev nyuaj siab concentration cheeb tsam thiab txo qhov tshwm sim ntawm cov kab nrib pleb. Qhov no yog ib qho tseem ceeb tshwj xeeb rau cov ntaub ntawv uas yuav tsum tau tiv thaiv sab nraud deformation (xws li sab nrauv phab ntsa rwb thaiv tsev, cov ntaub ntawv hloov tau yooj yim, thiab lwm yam).
3. Txhim khu kev tiv thaiv dej thiab huab cua tsis kam
Cov ntaub ntawv cement-based feem ntau ua rau dej seepage los yog kev ua haujlwm degradation thaum raug dej los yog ya raws rau lub sijhawm ntev. Cov ntaub ntawv siv cement-based cov khoom siv muaj cov dej nqus dej siab, thiab lawv lub zog txo qis, tshwj xeeb tshaj yog tom qab immersion mus ntev. Redispersible latex hmoov tuaj yeem txhim kho cov dej tsis kam ntawm cov khoom siv cement, feem ntau vim tias cov ntaub ntawv polymer nws tsim tom qab kho yog hydrophobic, uas tuaj yeem thaiv cov dej nkag mus rau hauv dej thiab txo cov dej nqus.
Kev tsim cov yeeb yaj kiab polymer kuj tuaj yeem tiv thaiv cov evaporation ntawm cov dej hauv cov khoom siv cement thiab tsis txhob shrinkage thiab cracking teeb meem tshwm sim los ntawm kev poob dej sai thaum lub sij hawm ziab. Qhov no kuj ua rau cov kua roj respersible latex ua lub luag haujlwm tseem ceeb hauv kev txhim kho huab cua tiv thaiv thiab khov-thaw tsis kam ntawm cov ntaub ntawv cement-based, yog li txuas ntxiv lub neej kev pab cuam ntawm cov khoom.
4. Txhim kho kev tsim kho kev ua haujlwm
Redispersible latex hmoov tuaj yeem tsis tsuas yog txhim kho lub cev ntawm cov khoom siv cement, tab sis kuj tseem txhim kho kev tsim kho. Tom qab siv cov hmoov latex, kev ua haujlwm, kev tuav dej thiab dej ntawm cov ntaub ntawv cement-based yog qhov zoo dua. Redispersible latex hmoov tuaj yeem ua kom lubricity ntawm cov cement mortar, ua rau nws yooj yim dua rau kev thov thiab sib kis, yog li txo qhov nyuaj thiab tsis ua haujlwm hauv kev tsim kho thiab txhim kho kev ua haujlwm.
Cov polymers hauv cov hmoov latex tuaj yeem txhim kho cov dej khaws cia ntawm cov ntaub ntawv cement-based, txo qhov tshwm sim los ntshav ntawm cov ntaub ntawv, tiv thaiv cov dej tsis txaus ntawm slurry, thiab xyuas kom meej tias cov ntaub ntawv muaj dej txaus rau cov tshuaj tiv thaiv dej thaum lub sij hawm hardening txheej txheem. Qhov no tsis tsuas yog ua rau lub zog ntawm cov khoom sib xws, tab sis kuj txhim kho kev ua haujlwm ntawm kev tsim kho.
5. Txhim kho qhov cuam tshuam thiab hnav tsis kam
Hauv kev siv cov khoom siv, cov khoom siv cement feem ntau yuav tsum tau tiv thaiv ntau yam kev cuam tshuam sab nraud, xws li taug kev, kev sib txhuam, thiab lwm yam. Cov khoom siv cement-based tsis ua haujlwm zoo hauv cheeb tsam no thiab nyiam hnav lossis tawg yooj yim. Redispersible latex hmoov tuaj yeem txhim kho qhov cuam tshuam thiab hnav tsis kam ntawm cov khoom siv los ntawm kev hloov pauv thiab tawv ntawm cov yeeb yaj kiab polymer.
Tom qab ntxiv cov hmoov latex redispersible, thaum cov cement-raws li cov khoom raug cuam tshuam los ntawm sab nraud quab yuam, cov ntaub ntawv polymer tsim sab hauv tuaj yeem nqus tau thiab cuam tshuam lub zog cuam tshuam thiab txo qhov kev puas tsuaj. Nyob rau tib lub sijhawm, kev tsim cov yeeb yaj kiab polymer kuj tseem txo qis cov khoom siv thaum hnav, yog li txhim kho cov khoom siv tau ntev.
6. Ib puag ncig phooj ywg
Raws li ib puag ncig tus phooj ywg cov ntaub ntawv, redispersible latex hmoov yog non-toxic thiab harmless thaum siv, thiab yog nyob rau hauv txoj kab nrog rau txoj kev loj hlob ntawm cov niaj hnub ntsuab tsev cov ntaub ntawv. Nws tsis tsuas yog txo cov tiam ntawm kev tsim khoom pov tseg, tab sis kuj ua rau kev ua haujlwm ntawm cov khoom siv thiab txo qhov kev xav tau ntawm kev saib xyuas thiab hloov ntau zaus, yog li txo qhov cuam tshuam ntawm ib puag ncig rau qee yam.
Raws li ib tug binder nyob rau hauv cement-raws li systems, daim ntawv thov ntawm redispersible latex hmoov zoo heev txhim kho cov khoom ntawm cov khoom, xws li adhesion, yooj, tawg kuj, dej tsis kam thiab hnav tsis kam. Tsis tas li ntawd, nws txoj kev txhim kho kev tsim kho thiab kev ua phooj ywg ib puag ncig kuj tau ua rau nws siv dav hauv cov khoom siv hauv tsev. Nrog rau kev nce qib ntawm kev siv thev naus laus zis thiab kev xav tau ntawm kev tsim kho, redispersible latex hmoov yuav ua lub luag haujlwm tseem ceeb hauv cov khoom siv cement thiab muab cov kev daws teeb meem zoo dua thiab ruaj khov rau kev tsim kho kev lag luam.
Post lub sij hawm: Sep-29-2024