Raws li cov khoom siv tseem ceeb tshaj plaws hauv kev tsim cov khoom siv tshuaj khib nyiab qhuav, cellulose ether plays lub luag haujlwm tseem ceeb hauv kev ua haujlwm thiab tus nqi ntawm cov tshuaj khib nyiab qhuav. Muaj ob hom cellulose ethers: ib qho yog ionic, xws li sodium carboxymethyl cellulose (CMC), thiab lwm yam yog non-ionic, xws li methyl cellulose (MC), hydroxyethyl cellulose (HEC), Hydroxypropyl cellulose (HPMC), thiab lwm yam. . Tam sim no, feem ntau ntawm cov khoom siv cellulose ether thoob ntiaj teb tau siv rau hauv cov khoom siv. Nrog rau txoj kev loj hlob sai ntawm kev lag luam qhuav sib xyaw mortar, kuv lub teb chaws cellulose ether tau ua tiav hauv zos, thiab qhov xwm txheej ntawm cov khoom txawv teb chaws tswj kev lag luam tau tawg. Nrog rau qhov muaj koob meej ntawm daim ntawv thov ntawm cov khoom siv khib nyiab qhuav qhuav, kuv lub teb chaws yuav dhau los ua lub ntiaj teb loj tshaj plaws ntawm cov khoom siv tshuaj khib nyiab qhuav, daim ntawv thov ntawm cellulose ether yuav nce ntxiv, thiab nws cov tuam txhab thiab cov khoom lag luam yuav nce ntxiv. Cov khoom ua tau zoo ntawm cellulose ether nyob rau hauv qhuav sib xyaw mortar tau dhau los ua qhov tseem ceeb ntawm cov neeg tsim khoom thiab cov neeg siv khoom.
Cov cuab yeej tseem ceeb tshaj plaws ntawm cellulose ether yog nws cov dej tuav hauv cov khoom siv hauv tsev. Yog tias tsis muaj qhov sib ntxiv ntawm cellulose ether, cov txheej nyias nyias ntawm cov mortar tshiab dries sai sai uas cov cement tsis tuaj yeem hydrate li qub thiab cov mortar tsis tuaj yeem tawv thiab ua tau zoo cohesion. Nyob rau tib lub sijhawm, qhov sib ntxiv ntawm cellulose ether ua rau cov mortar muaj cov yas zoo thiab yoog raws, thiab txhim kho kev sib raug zoo ntawm cov mortar. Cia peb tham txog qhov cuam tshuam ntawm daim ntawv thov ntawm cov tshuaj khib nyiab qhuav los ntawm cov khoom lag luam ntawm cellulose ether.
1. Qhov zoo ntawm cellulose
Lub fineness ntawm cellulose ether cuam tshuam nws solubility. Piv txwv li, qhov qis dua qhov zoo ntawm cellulose ether, nws sai dua nws yaj hauv dej thiab txhim kho cov dej tuav kev ua haujlwm. Yog li ntawd, qhov zoo ntawm cellulose ether yuav tsum suav nrog ua ib qho ntawm nws cov khoom tshawb nrhiav. Feem ntau hais lus, lub sieve residue ntawm cellulose ether fineness tshaj 0.212mm yuav tsum tsis txhob ntau tshaj 8.0%.
2. Qhuav qhov hnyav poob tus nqi
Qhov ziab poob qhov hnyav yog hais txog qhov feem pua ntawm cov khoom ploj hauv qhov loj ntawm cov qauv qub thaum cov cellulose ether qhuav ntawm qhov kub thiab txias. Rau qee qhov zoo ntawm cellulose ether, qhov ziab poob qis yog siab dhau, uas yuav txo cov ntsiab lus ntawm cov khoom xyaw nquag hauv cellulose ether, cuam tshuam rau daim ntawv thov cuam tshuam ntawm cov lag luam downstream, thiab nce tus nqi yuav khoom. Feem ntau, qhov poob phaus ntawm ziab ntawm cellulose ether tsis ntau tshaj 6.0%.
3. Sulfate tshauv cov ntsiab lus ntawm cellulose ether
Rau qee qhov zoo ntawm cellulose ether, cov hmoov tshauv yog siab dhau lawm, 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. Lub sulfate tshauv ntsiab lus ntawm cellulose ether yog ib qho tseem ceeb ntsuas ntawm nws tus kheej kev ua tau zoo. Ua ke nrog cov xwm txheej tam sim no ntawm kuv lub teb chaws cov tuam txhab cellulose ether uas twb muaj lawm, feem ntau cov hmoov tshauv ntawm MC, HPMC, HEMC yuav tsum tsis pub tshaj 2.5%, thiab cov hmoov tshauv ntawm HEC cellulose ether yuav tsum tsis pub tshaj 10.0%.
4. Viscosity ntawm cellulose ether
Cov dej tuav thiab cov nyhuv thickening ntawm cellulose ether feem ntau yog nyob ntawm viscosity thiab ntau npaum ntawm cellulose ether nws tus kheej ntxiv rau cov cement slurry.
5. Tus nqi pH ntawm cellulose ether
Lub viscosity ntawm cellulose ether cov khoom yuav maj mam txo tom qab khaws cia ntawm qhov kub thiab txias los yog lub sij hawm ntev, tshwj xeeb tshaj yog rau high-viscosity khoom, yog li nws yog tsim nyog los txwv pH. Feem ntau, nws raug nquahu kom tswj pH ntau ntawm cellulose ether rau 5-9.
6. Lub teeb transmittance ntawm cellulose ether
Lub teeb xa hluav taws xob ntawm cellulose ether ncaj qha cuam tshuam rau nws txoj kev siv cov khoom siv hauv tsev. Lub ntsiab tseem ceeb cuam tshuam rau lub teeb xa hluav taws xob ntawm cellulose ether yog: (1) cov khoom siv raw zoo; (2) cov nyhuv ntawm alkalization; (3) tus txheej txheem piv; (4) hnyav ratio; (5) neutralization nyhuv. Raws li kev siv cov nyhuv, lub teeb xa hluav taws xob ntawm cellulose ether yuav tsum tsis pub tsawg dua 80%.
7. Lub gel kub ntawm cellulose ether
Cellulose ether feem ntau yog siv los ua viscosifier, plasticizer thiab dej tuav tus neeg sawv cev hauv cov khoom siv cement, yog li viscosity thiab gel kub yog qhov tseem ceeb rau kev ntsuas qhov zoo ntawm cellulose ether. Lub gel kub yog siv los txiav txim seb hom cellulose ether, uas muaj feem xyuam rau qib ntawm kev hloov ntawm cellulose ether. Tsis tas li ntawd, ntsev thiab impurities tuaj yeem cuam tshuam rau qhov kub thiab txias. Thaum qhov kub ntawm cov tshuaj nce, cov cellulose polymer maj mam poob dej, thiab cov viscosity ntawm cov tshuaj txo. Thaum lub gel point yog mus txog, lub polymer yog kiag li lub cev qhuav dej thiab tsim ib tug gel. Yog li ntawd, nyob rau hauv cov khoom cement, qhov kub thiab txias feem ntau yog tswj hauv qab qhov pib gel kub. Nyob rau hauv cov xwm txheej no, qhov kub thiab txias, qhov siab dua qhov viscosity, thiab qhov pom tseeb ntawm cov nyhuv ntawm thickening thiab dej tuav.
Post lub sij hawm: Feb-17-2023