Raws li cov khoom sib xyaw tseem ceeb tshaj plaws hauv kev tsim cov khoom siv mortar qhuav, cellulose ether ua lub luag haujlwm tseem ceeb hauv kev ua tau zoo thiab tus nqi ntawm cov mortar qhuav. Muaj ob hom cellulose ethers: ib qho yog ionic, xws li sodium carboxymethyl cellulose (CMC), thiab lwm qhov yog non-ionic, xws li methyl cellulose (MC), hydroxyethyl cellulose (HEC), Hydroxypropyl cellulose (HPMC), thiab lwm yam. Nrog rau kev nce ntxiv ntawm kev siv cov khoom siv mortar qhuav, kuv lub tebchaws yuav dhau los ua lub ntiaj teb cov neeg tsim khoom siv mortar qhuav loj tshaj plaws, kev siv cellulose ether yuav nce ntxiv, thiab nws cov chaw tsim khoom thiab cov khoom lag luam kuj yuav nce ntxiv. Kev ua tau zoo ntawm cov khoom ntawm cellulose ether hauv cov mortar qhuav tau dhau los ua qhov chaw tsom mus rau cov neeg tsim khoom thiab cov neeg siv.
Qhov tseem ceeb tshaj plaws ntawm cellulose ether yog nws cov dej khaws cia rau hauv cov ntaub ntawv tsim kho. Yog tsis muaj ntxiv cellulose ether, cov txheej nyias nyias ntawm cov mortar tshiab qhuav sai heev uas cov cement tsis tuaj yeem hydrate hauv txoj kev ib txwm thiab cov mortar tsis tuaj yeem tawv thiab ua tiav kev sib koom ua ke zoo. Tib lub sijhawm, qhov ntxiv ntawm cellulose ether ua rau cov mortar muaj plasticity zoo thiab yooj ywm, thiab txhim kho lub zog sib txuas ntawm cov mortar. Cia peb tham txog qhov cuam tshuam rau kev siv cov mortar qhuav-sib xyaw los ntawm cov khoom ua tau zoo ntawm cellulose ether.
1. Qhov zoo ntawm cellulose
Qhov fineness ntawm cellulose ether cuam tshuam rau nws cov solubility. Piv txwv li, qhov qis dua qhov fineness ntawm cellulose ether, qhov sai dua nws yaj hauv dej thiab kev txhim kho ntawm kev ua haujlwm khaws dej. Yog li ntawd, qhov fineness ntawm cellulose ether yuav tsum suav nrog ua ib qho ntawm nws cov khoom tshawb nrhiav. Feem ntau hais lus, qhov seem ntawm sieve ntawm cellulose ether fineness tshaj 0.212mm yuav tsum tsis pub ntau tshaj 8.0%.
2. Kev ziab kom qhuav qhov hnyav poob qis
Tus nqi poob phaus thaum ziab yog hais txog feem pua ntawm qhov hnyav ntawm cov khoom poob hauv qhov hnyav ntawm cov qauv qub thaum cov cellulose ether raug ziab ntawm qee qhov kub. Rau qee qhov zoo ntawm cellulose ether, tus nqi poob phaus thaum ziab siab dhau, uas yuav txo cov ntsiab lus ntawm cov khoom xyaw nquag hauv cellulose ether, cuam tshuam rau cov txiaj ntsig ntawm kev siv ntawm cov lag luam downstream, thiab ua rau tus nqi yuav khoom nce ntxiv. Feem ntau, qhov hnyav poob thaum ziab ntawm cellulose ether tsis ntau tshaj 6.0%.
3. Cov ntsiab lus ntawm cov tshauv sulfate ntawm cellulose ether
Rau qee qhov zoo ntawm cellulose ether, cov tshauv ntsiab lus siab dhau, uas yuav txo cov ntsiab lus ntawm cov khoom xyaw nquag hauv cellulose ether thiab cuam tshuam rau daim ntawv thov cov txiaj ntsig ntawm cov lag luam downstream. Cov sulfate tshauv ntsiab lus ntawm cellulose ether yog qhov ntsuas tseem ceeb ntawm nws tus kheej kev ua tau zoo. Ua ke nrog cov xwm txheej tam sim no ntawm kuv lub teb chaws cov cellulose ether manufacturers uas twb muaj lawm, feem ntau cov tshauv ntsiab lus ntawm MC, HPMC, HEMC yuav tsum tsis pub tshaj 2.5%, thiab cov tshauv ntsiab lus ntawm HEC cellulose ether yuav tsum tsis pub tshaj 10.0%.
4. Viscosity ntawm cellulose ether
Qhov kev khaws cia dej thiab cov nyhuv tuab ntawm cellulose ether feem ntau nyob ntawm qhov viscosity thiab koob tshuaj ntawm cellulose ether nws tus kheej ntxiv rau cov cement slurry.
5. Tus nqi pH ntawm cellulose ether
Qhov viscosity ntawm cov khoom cellulose ether yuav maj mam txo qis tom qab khaws cia rau qhov kub siab dua lossis ntev, tshwj xeeb tshaj yog rau cov khoom muaj viscosity siab, yog li nws yog qhov tsim nyog los txwv pH. Feem ntau, nws raug nquahu kom tswj cov pH ntawm cellulose ether rau 5-9.
6. Kev xa hluav taws xob ntawm cellulose ether
Qhov kev xa tawm ntawm lub teeb ntawm cellulose ether ncaj qha cuam tshuam rau nws cov txiaj ntsig ntawm kev siv hauv cov ntaub ntawv tsim kho. Cov yam tseem ceeb uas cuam tshuam rau qhov kev xa tawm ntawm lub teeb ntawm cellulose ether yog: (1) qhov zoo ntawm cov ntaub ntawv raw; (2) qhov cuam tshuam ntawm alkalization; (3) qhov piv ntawm cov txheej txheem; (4) qhov piv ntawm cov kuab tshuaj; (5) qhov cuam tshuam neutralization. Raws li kev siv cov txiaj ntsig, qhov kev xa tawm ntawm lub teeb ntawm cellulose ether yuav tsum tsis pub tsawg dua 80%.
7. Qhov kub ntawm cellulose ether hauv gel
Cellulose ether feem ntau yog siv ua viscosifier, plasticizer thiab dej khaws cia tus neeg sawv cev hauv cov khoom cement, yog li viscosity thiab gel kub yog cov ntsuas tseem ceeb los piav qhia qhov zoo ntawm cellulose ether. Qhov kub gel yog siv los txiav txim siab hom cellulose ether, uas muaj feem cuam tshuam rau qib ntawm kev hloov pauv ntawm lwm cov cellulose ethers. Tsis tas li ntawd, ntsev thiab impurities kuj tuaj yeem cuam tshuam rau qhov kub gel. Thaum qhov kub ntawm cov tshuaj nce siab, cov cellulose polymer maj mam poob dej, thiab qhov viscosity ntawm cov tshuaj txo qis. Thaum lub ntsiab lus gel raug ncav cuag, cov polymer raug qhuav tag nrho thiab tsim cov gel. Yog li ntawd, hauv cov khoom cement, qhov kub feem ntau raug tswj qis dua qhov kub gel pib. Hauv qab qhov xwm txheej no, qhov kub qis dua, qhov viscosity siab dua, thiab qhov pom tseeb ntau dua ntawm cov nyhuv ntawm thickening thiab dej khaws cia.
Lub sijhawm tshaj tawm: Lub Rau Hli-01-2023