Lub luag haujlwm ntawmredispersiblepolymerhmoovnyob rau hauv putty hmoov: nws muaj zog adhesion thiab mechanical zog, zoo waterproofness, permeability, thiab zoo heev alkali tsis kam thiab hnav tsis kam, thiab tuaj yeem txhim kho cov dej tuav thiab ua kom lub sijhawm qhib rau kev txhim kho durability.
1. Cov nyhuv ntawm cov tshuaj mortar tshiab
1) Txhim kho kev tsim kho.
2) Ntxiv dej tuav los txhim kho cov cement hydration.
3) Ua kom muaj peev xwm ua haujlwm.
4) Tsis txhob tawg thaum ntxov.
2. Cov nyhuv ntawm hardening mortar
1) Txo cov elastic modulus ntawm lub mortar thiab ua rau kom muaj kev sib raug zoo nrog lub hauv paus txheej.
2) Ua kom yoog raws thiab tiv thaiv kev tawg.
3) Txhim kho qhov tsis kam rau cov hmoov poob.
4) Hydrophobic lossis txo qhov nqus dej.
5) Ua kom cov adhesion rau lub hauv paus txheej.
Lub redispersible latex hmoov tsim ib lub polymer emulsion nyob rau hauv kev sib cuag nrog dej.Thaum lub sij hawm sib tov thiab ziab, cov emulsion yog dehydrated dua.Cov hmoov latex ua haujlwm hauv cov hmoov putty, thiab cov txheej txheem sib xyaw ua ke ntawm cov cement hydration thiab latex hmoov zaj duab xis tsim ua tiav hauv plaub kauj ruam:
①Thaum cov hmoov latex redispersible sib tov sib xyaw nrog dej hauv cov hmoov putty, nws tau tawg mus rau hauv cov khoom zoo polymer;
② Cov cement gel yog maj mam tsim los ntawm thawj hydration ntawm cov cement, cov kua theem yog saturated nrog Ca (OH) 2 tsim thaum lub sij hawm hydration txheej txheem, thiab cov polymer hais los ntawm cov hmoov latex yog tso rau saum npoo ntawm cov cement gel / unhydrated cement particle sib tov;
③ Raws li cov cement yog ntxiv hydrated, cov dej hauv capillary pores txo qis, thiab cov khoom polymer yog maj mam kaw rau hauv cov hlab ntsha capillary, tsim cov txheej ntim nruj nreem rau saum npoo ntawm cov cement gel / unhydrated cement particle sib tov thiab muab tub lim;
④ Nyob rau hauv qhov kev txiav txim ntawm hydration cov tshuaj tiv thaiv, lub hauv paus txheej nqus thiab nto evaporation, cov ya raws yog ntxiv txo, thiab tsim stacking txheej yog aggregated rau hauv ib tug nyias zaj duab xis, thiab cov hydration tshuaj tiv thaiv cov khoom yog sib koom ua ke los tsim ib tug tag nrho network qauv.Cov txheej txheem sib xyaw ua ke tsim los ntawm cov cement hydration thiab latex hmoov zaj duab xis tsim txhim kho lub zog tawg tsis kam ntawm putty.
Los ntawm qhov kev xav ntawm kev siv tswv yim, lub zog ntawm putty siv los ua cov txheej txheem hloov pauv ntawm cov rwb thaiv tsev sab nraud thiab cov txheej txheem ntawm cov phab ntsa sab nrauv yuav tsum tsis txhob siab dua li ntawm plastering mortar, txwv tsis pub nws yog ib qho yooj yim los tsim cracking.Nyob rau hauv tag nrho cov rwb thaiv tsev system, qhov yooj ntawm lub putty yuav tsum siab tshaj ntawm cov substrate.Nyob rau hauv txoj kev no, lub putty tuaj yeem hloov kho kom zoo dua rau qhov deformation ntawm lub substrate thiab tsis nws tus kheej deformation nyob rau hauv qhov kev txiav txim ntawm ib puag ncig ib puag ncig, txo kev ntxhov siab, thiab txo qhov muaj peev xwm ntawm kev tawg thiab tev ntawm txheej.
Post lub sij hawm: Oct-27-2022