Nyob rau hauv cov khoom xyaw ntawm cov hmoov qhuav mortar,cellulose etheryog ib qho khoom siv tseem ceeb uas muaj qhov ntxiv tsawg, tab sis nws tuaj yeem txhim kho qhov kev sib xyaw thiab kev tsim kho ntawm cov mortar. Hauv kev hais yooj yim, yuav luag txhua qhov kev sib xyaw ntub ntawm cov mortar uas tuaj yeem pom nrog lub qhov muag liab qab yog muab los ntawm cellulose ether. Nws yog ib qho cellulose derivative tau los ntawm kev siv cellulose los ntawm ntoo thiab paj rwb, reacting nrog caustic soda, thiab tom qab ntawd etherifying nrog tus neeg sawv cev etherifying.
Hom cellulose ethers
A. Hydroxypropyl methyl cellulose (HPMC), uas yog ua los ntawm cov paj rwb ntshiab siab ua cov khoom siv raw, tshwj xeeb yog etherified nyob rau hauv alkaline tej yam kev mob.
B. Hydroxyethyl methylcellulose (HEMC), ib qho non-ionic cellulose ether, yog hmoov dawb zoo li, tsis muaj ntxhiab thiab tsis qab.
C. Hydroxyethyl cellulose (HEC), ib qho surfactant uas tsis yog ionic, dawb zoo li, tsis muaj ntxhiab, tsis muaj saj thiab yooj yim ntws hmoov.
Cov saum toj no yog cov non-ionic cellulose ethers, thiab ionic cellulose ethers (xws li carboxymethyl cellulose CMC).
Thaum siv cov hmoov qhuav mortar, vim tias ionic cellulose (CMC) tsis ruaj khov nyob rau hauv qhov muaj calcium ions, nws tsis tshua muaj siv rau hauv cov txheej txheem inorganic gelling nrog cement thiab slaked lime ua cov ntaub ntawv cementing. Hauv qee qhov chaw hauv Suav teb, Qee cov phab ntsa sab hauv putties ua tiav nrog cov hmoov txhuv nplej hloov kho ua cov ntaub ntawv cementing tseem ceeb thiab Shuangfei hmoov ua cov khoom siv siv CMC ua cov thickener. Txawm li cas los xij, vim tias cov khoom no yooj yim rau mildew thiab tsis tiv taus dej, nws maj mam tshem tawm los ntawm kev ua lag luam. Tam sim no, cellulose ether feem ntau siv hauv Suav teb yog HPMC.
Cellulose ether feem ntau yog siv los ua tus neeg sawv cev khaws dej thiab ua kom tuab hauv cov ntaub ntawv cement.
Nws lub luag haujlwm khaws dej tuaj yeem tiv thaiv cov substrate kom tsis txhob nqus dej ntau dhau thiab cuam tshuam kev ua kom dej tsis txhob evaporate, yog li ntawd kom ntseeg tau tias cov cement muaj dej txaus thaum nws hydrated. Piv txwv li, kev ua haujlwm plastering. Thaum cov cement slurry ib txwm siv rau ntawm qhov chaw, cov substrate qhuav thiab porous yuav sai sai nqus dej ntau ntawm cov slurry, thiab cov cement slurry txheej ze rau ntawm txheej hauv paus yuav yooj yim poob dej uas xav tau rau hydration. , yog li tsis tsuas yog tsis tuaj yeem tsim cov cement gel nrog lub zog sib txuas ntawm qhov chaw ntawm cov substrate, tab sis nws kuj yooj yim rau warping thiab dej seepage, yog li ntawd cov cement slurry txheej saum npoo av yooj yim poob tawm. Thaum cov grout siv yog nyias, nws kuj yooj yim los tsim cov kab nrib pleb hauv tag nrho cov grout. Yog li ntawd, hauv kev ua haujlwm plastering saum npoo av yav dhau los, dej feem ntau yog siv los ntub cov substrate ua ntej, tab sis qhov kev ua haujlwm no tsis yog tsuas yog siv zog thiab siv sijhawm ntau xwb, tab sis kuj tseem nyuaj rau tswj qhov zoo ntawm kev ua haujlwm.
Feem ntau hais lus, qhov kev khaws dej ntawm cov cement slurry nce ntxiv nrog rau qhov nce ntawm cov cellulose ether. Qhov viscosity ntau dua ntawm cov cellulose ether ntxiv, qhov kev khaws dej zoo dua.
Ntxiv rau qhov khaws dej thiab ua kom tuab, cellulose ether kuj tseem cuam tshuam rau lwm yam khoom ntawm cov cement mortar, xws li kev ncua, entraining cua, thiab ua kom lub zog sib txuas ntxiv. Cellulose ether ua rau qeeb qeeb qhov teeb tsa thiab cov txheej txheem tawv ntawm cement, yog li ua kom lub sijhawm ua haujlwm ntev dua. Yog li ntawd, nws qee zaum siv ua cov tshuaj coagulant.
Nrog rau kev tsim cov mortar qhuav-mixed,cellulose ethertau dhau los ua ib qho tseem ceeb ntawm cov cement mortar admixture. Txawm li cas los xij, muaj ntau hom thiab cov lus qhia ntawm cellulose ether, thiab qhov zoo ntawm cov pawg tseem hloov pauv.
Lub sijhawm tshaj tawm: Plaub Hlis-25-2024