Cement-raws li pobzeb nplaum yog tam sim no qhov loj tshaj plaws ntawm daim ntawv thov tshwj xeeb qhuav-sib xyaw mortar, uas yog tsim los ntawm cov cement raws li cov khoom siv cementitious thiab ntxiv los ntawm cov khoom sib xyaw ua ke, cov dej tuav cov neeg ua haujlwm, cov neeg ua haujlwm thaum ntxov, cov hmoov latex thiab lwm yam organic lossis inorganic additives. sib tov. Feem ntau, nws tsuas yog yuav tsum tau tov nrog dej thaum siv. Piv nrog rau cov cement mortar zoo tib yam, nws tuaj yeem txhim kho lub zog sib txuas ntawm cov khoom siv thiab cov substrate, thiab muaj kev ua haujlwm tsis zoo thiab cov dej tsis zoo thiab cov cua sov. Thiab qhov zoo ntawm khov-thaw lub voj voog tiv thaiv, feem ntau yog siv los muab cov vuas vov tsev sab hauv thiab sab nrauv phab ntsa, cov vuas hauv pem teb thiab lwm yam khoom siv kho kom zoo nkauj, dav siv rau sab hauv thiab sab nrauv phab ntsa, hauv pem teb, chav dej, chav ua noj thiab lwm qhov chaw kho kom zoo nkauj architectural, yog tam sim no lub feem ntau dav siv ceramic pobzeb sib txuas cov ntaub ntawv.
Feem ntau thaum peb txiav txim siab qhov kev ua tau zoo ntawm cov pobzeb nplaum, peb tsis tsuas yog them sai sai rau nws txoj haujlwm ua haujlwm thiab muaj peev xwm tiv thaiv zawv zawg, tab sis kuj xyuam xim rau nws lub zog txhua yam thiab lub sijhawm qhib. Cellulose ether nyob rau hauv pobzeb nplaum tsis tsuas yog cuam tshuam rau cov khoom siv rheological ntawm porcelain nplaum, xws li kev ua haujlwm du, nplaum riam, thiab lwm yam.
1. Lub sijhawm qhib
Thaum cov hmoov roj hmab thiab cellulose ether sib koom ua ke hauv cov khib nyiab ntub dej, qee cov ntaub ntawv qauv qhia tau hais tias cov hmoov roj hmab muaj zog kinetic zog los txuas rau cov khoom siv cement hydration, thiab cellulose ether muaj ntau nyob rau hauv cov kua dej interstitial, uas cuam tshuam ntau dua Mortar viscosity thiab teem sij hawm. Qhov nro ntawm cellulose ether yog ntau dua li ntawm cov hmoov roj hmab, thiab ntau cellulose ether enriched ntawm lub mortar interface yuav muaj txiaj ntsig zoo rau kev tsim cov hydrogen bonds ntawm lub hauv paus nto thiab cellulose ether.
Nyob rau hauv lub mortar ntub dej, cov dej nyob rau hauv lub mortar evaporates, thiab cellulose ether yog enriched rau ntawm qhov chaw, thiab ib tug zaj duab xis yuav tsim nyob rau ntawm qhov chaw ntawm lub mortar nyob rau hauv 5 feeb, uas yuav txo tau cov tom ntej no evaporation tus nqi, raws li cov dej ntau dua. tshem tawm ntawm cov mortar thicker Ib feem ntawm nws migrates mus rau lub thinner mortar txheej, thiab cov zaj duab xis tsim nyob rau hauv thaum pib yog ib nrab yaj, thiab cov migration ntawm dej yuav coj ntau cellulose ether enrichment nyob rau hauv mortar nto.
Cov zaj duab xis tsim ntawm cellulose ether nyob rau saum npoo ntawm mortar muaj kev cuam tshuam zoo rau kev ua haujlwm ntawm mortar:
1. Cov zaj duab xis tsim yog nyias dhau thiab yuav yaj ob zaug, tsis tuaj yeem txwv cov evaporation ntawm dej thiab txo lub zog.
2. Cov zaj duab xis tsim yog tuab heev. Qhov concentration ntawm cellulose ether nyob rau hauv mortar interstitial kua yog siab thiab viscosity siab. Nws tsis yog yooj yim los rhuav cov zaj duab xis saum npoo thaum cov vuas yog pasted.
Nws tuaj yeem pom tias cov yeeb yaj kiab tsim cov khoom ntawm cellulose ether muaj kev cuam tshuam ntau dua rau lub sijhawm qhib. Hom cellulose ether (HPMC, HEMC, MC, thiab lwm yam) thiab cov degree ntawm etherification (substitution degree) ncaj qha cuam tshuam rau cov yeeb yaj kiab-tsim cov khoom ntawm cellulose ether, thiab hardness thiab toughness ntawm zaj duab xis.
Post lub sij hawm: Dec-26-2022