1. Taw qhia rau cellulose ether:
Chemical Structure: Cellulose ethers yog dej-soluble polymers muab tau los ntawm cellulose, ib tug natural polysaccharide pom nyob rau hauv cov nroj tsuag cell phab ntsa. Nws muaj cov piam thaj rov qab txuas los ntawm β-1,4-glycosidic bonds.
Hydrophilicity: Cellulose ether yog hydrophilic, uas txhais tau hais tias nws muaj zog affinity rau dej.
2. Lub luag haujlwm ntawm cellulose ether hauv mortar:
Kev tuav dej: Ib qho ntawm lub luag haujlwm tseem ceeb ntawm cellulose ether hauv mortar yog txhawm rau txhim kho dej tuav. Nws tsim ib zaj duab xis nyias nyob ib ncig ntawm cov cement hais, txo cov dej evaporation thiab ua kom cov txheej txheem hydration ntev dua.
Txhim kho kev ua haujlwm: Cellulose ether ua raws li kev hloov kho rheology txhawm rau txhim kho kev ua haujlwm ntawm mortar. Qhov no yog qhov tshwj xeeb tshaj yog rau cov ntawv thov xws li plastering thiab rendering.
3. Qhov cuam tshuam rau lub ntim ntim:
Kev nqus dej: Lub hydrophilic xwm ntawm cellulose ethers ua rau lawv nqus dej los ntawm kev sib tov. Raws li nws nthuav dav, tag nrho cov dej ntsiab lus hauv mortar nce, ua rau ntim expansion.
Huab cua nkag: Ntxiv cellulose ethers tuaj yeem ua kom cua nkag mus rau hauv mortar. Trapped cua npuas ua rau lub ntim nce.
Pore qauv: Cellulose ethers tuaj yeem cuam tshuam rau microstructure ntawm mortar, ua kom muaj qhov ntxeem tau ntau dua. Qhov kev hloov pauv ntawm qhov pore qauv no ua rau muaj qhov nce ntxiv hauv ntim.
4.Hydration txheej txheem thiab ntim expansion:
Kev ncua dej tsis tu ncua: Cellulose ethers tuaj yeem ua rau cov txheej txheem hydration ntawm cov cement. Qhov kev ncua sij hawm dej no tso cai rau kev faib dej ntau dua hauv cov tshuaj khib nyiab, uas tuaj yeem ua rau muaj qhov ntim ntau ntxiv.
Curing nyhuv: Cov dej txuas ntxiv tau txhawb nqa los ntawm cellulose ethers pab txuas ntxiv lub sijhawm kho, tso cai rau cov cement hais kom muaj dej ntau dua thiab cuam tshuam rau qhov kawg ntim ntawm mortar.
5. Kev sib cuam tshuam nrog lwm cov khoom xyaw:
Kev sib cuam tshuam ntawm cov khoom sib txuas: Cellulose ethers cuam tshuam nrog cov cement binders los tsim cov matrix ruaj khov. Qhov kev cuam tshuam no cuam tshuam rau kev sib raug zoo ntawm cov khoom thiab ua rau lub ntim nthuav dav.
Admixture synergy: Yog tias cov cellulose ethers siv ua ke nrog lwm cov khoom sib xyaw, cov nyhuv synergistic yuav tshwm sim, cuam tshuam rau tag nrho cov ntim ntawm cov tshuaj khib.
6. Particle dispersion thiab faib:
Uniform dispersion: Thaum cellulose ether yog dispersed kom zoo nyob rau hauv lub mortar, nws yuav ua rau cov particle tis ntau uniform. Qhov kev sib txuam no cuam tshuam rau cov ntim ntim thiab yog li qhov ntim ntawm cov tshuaj khib.
7. Ib puag ncig tej yam kev mob:
Kub thiab av noo: Ib puag ncig tej yam kev mob xws li kub thiab av noo tuaj yeem cuam tshuam tus cwj pwm ntawm cellulose ethers hauv mortar. Cov khoom o thiab dej nqus dej tuaj yeem sib txawv raws li ib puag ncig sib txawv, cuam tshuam rau ntim.
8. Xaus:
Nyob rau hauv cov ntsiab lus, qhov nce ntim tau pom raws li qhov sib ntxiv ntawm cellulose ethers rau mortars yog qhov tshwm sim ntawm kev sib cuam tshuam nrog rau cov dej uptake, ncua hydration, huab cua nkag, thiab kev hloov hauv mortar microstructure. Kev nkag siab txog cov txheej txheem no yog qhov tseem ceeb rau kev txhim kho kev siv cellulose ethers hauv cov khoom sib tov thiab ua tiav cov khoom xav tau hauv kev tsim kho.
Post lub sij hawm: Dec-01-2023