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Cov nyhuv ntawm cov roj hmab hmoov thiab cellulose hauv cov nplais nplaum

Pobzeb nplaum yog ib qho ntawm cov ntawv thov loj tshaj plaws ntawm kev sib xyaw qhuav-sib nphua tom ntej no. Nov yog hom xis mas yog cov tshuaj xis zoo thiab txhawb nqa cov neeg sawv cev, cov hmoov txhuas thaum ntxov thiab lwm cov organic lossis lwm cov organic lossis inorgegic additives. sib xyaw. Feem ntau, nws tsuas yog xav tau sib xyaw nrog dej thaum siv. Piv nrog dog dig colut, nws tuaj yeem txhim kho txoj kev sib raug zoo ntawm cov khoom siv thiab cov ntaub so zoo, muaj cov dej tsis kam ua tau zoo thiab cov cua sov ua tsis taus. Thiab qhov zoo ntawm khov-thaw puag ncig tiv taus, cov vuas luaj, chav tsev dai rau sab hauv, chav ua noj ua haus thiab lwm cov khoom siv hluav taws xob, yog tam sim no cov khoom siv hluav taws xob

Feem ntau thaum peb txiav txim rau kev ua yeeb yam ntawm cov nplais nplaum, peb tsis tsuas yog them rau kev ua haujlwm thiab kev tawm tsam kev ua haujlwm, tab sis kuj tseem ua tib zoo mloog nws lub zog kho zog thiab qhib lub sijhawm. Cellulose ether rau hauv cov nplais nplaum tsis yog cuam tshuam rau cov khoom ua haujlwm ntawm cov kab mob du, tab sis kuj tseem muaj cov khoom siv hluav taws xob, tab sis kuj tseem muaj cov khoom muaj zog ntawm cov pobzeb nplaum. Cuam tshuam rau lub sij hawm qhib ntawm cov nplais nplaum

Thaum roj hmab hmoov thiab cellulose ether can-ether ether muaj zog dua hauv cov roj hmab dej khov, uas cuam tshuam cov tshuaj khib ntau dua thiab cov sijhawm teeb tsa. Lub nro ntawm cellulose ether yog siab dua li ntawm cov roj hmab hmoov av, thiab ntau dua cellule interface yuav muaj txiaj ntsig zoo rau kev tsim ntawm cov kab hlau thiab cellulose ether.

Hauv lub tshuaj khib nyiab ntub dej, thiab cov cellulose txheej, thiab cov yeeb yaj kiab tau muab tso rau ntawm cov dej phib tawj, thiab cov yeeb yaj kiab tau ua rau muaj qee qhov yuav coj cov cellulose ntau dua ether etrichment on cug cug saum npoo.

Yog li ntawd, zaj duab xis tsim ntawm cellulose ether rau saum npoo ntawm kab cort muaj qhov cuam tshuam zoo ntawm kev tshuaj khib.

1) Cov yeeb yaj kiab tsim tau dhau lawm thiab yuav yaj ob zaug, tsis tuaj yeem txwv txoj hlab dej thiab txo lub zog.

2) Cov yeeb yaj kiab tsim yog tuab heev, lub concentration ntawm cellulose ua kua siab, yog li nws tsis yooj yim los tsoo cov yeeb yaj kiab saum npoo thaum cov vuas yog pasted.

Nws tuaj yeem pom tau tias cov yeeb yaj kiab ua yeeb yam ntawm cellulose ether tau cuam tshuam rau lub sijhawm qhib. Hom ntawm cellulose ether (HPMC, Hemm, Hems (hloov chaw) thiab qib siab ntawm cov yeeb yaj kiab ether, thiab kev nyuaj thiab tawv ntawm zaj duab xis.

Ntxiv rau qhov ua kom pom cov txiaj ntsig saum toj saud kom tshuaj khib, cellulose ether tseem tuaj cov mineting kinetics ntawm cov cement. Qhov nyhuv retarding no yog feem ntau vim yog cov adsorption ntawm cellule cov khoom siv ither tau adsorbed rau ntau yam li CSHS thiab calciumide. Ntawm cov tshuaj lom neeg, nws tsis tshua muaj adsorbed ntawm thawj cov chaw ntxhoo ntawm clinker. Ib qho ntxiv, cellulose ether txo lub zog ntawm ions (CA2-, yog li cov kev daws teeb meem ntawm cov txheej txheem hydration.

Viscosity yog lwm qhov tseem ceeb parameter, uas sawv cev rau cov tshuaj lom neeg ntawm cellulose ether. Raws li tau hais los saum no, lub viscosity tsuas yog cuam tshuam rau lub peev xwm kav dej thiab tseem muaj cov txiaj ntsig tseem ceeb ntawm kev ua haujlwm ntawm cov cug cug. Txawm li cas los xij, kev sim tshawb pom tau pom tias cov viscosity ntawm cellulose ether muaj yuav luag tsis cuam tshuam rau Minas hulation kinetics. Molecular hnyav muaj cov nyhuv me me ntawm kev haus dej, thiab qhov hnyav tshaj plaws ntawm cov hnyav hnyav molecular tsuas yog 10min. Yog li ntawd, qhov hnyav molecular tsis yog qhov tseem ceeb ntsuas tswj kev tswj hwm txoj cai xis.

"Daim ntawv thov ntawm cellulose ether hauv cement-randed qhuav-celled qhuav-banded qhuav-setardation ntawm cellulose nyob ntawm nws cov qauv tshuaj. Thiab cov qauv dav dav xaus yog rau MHEC, qib siab dua ntawm kev methylation, qhov me dua cov txiaj ntsig ether ether. Tsis tas li ntawd, cov nyhuv retarding ntawm hydrophilic hloov (xws li hloov chaw rau HEC) muaj zog dua li ntawm Hydrophobic hloov (xws li hloov chaw rau MH, MHEC, MHPC). Kev ua kom raug retarding ntawm cellulose ether tsuas cuam tshuam los ntawm ob qho tsis muaj, hom thiab ntau thiab ntau ntawm cov pab pawg hloov chaw.

Cov kev sim siv cov ntsiab lus tseem pom tias cov ntsiab lus ntawm cov neeg hloov chaw yog lub luag haujlwm tseem ceeb hauv kev ua haujlwm muaj zog ntawm cov nplais nplaum. Rau HPMC, qee qhov kev hloov kho ntawm cov khoom siv yuav tsum ua kom nws cov dej solubility thiab teeb meem kev hloov chaw. Cov ntsiab lus ntawm cov ntsiab lus ntawm chaw tuaj yeem txiav txim lub zog ntawm HPMC. Cov pa taws kub kuj tseem txiav txim siab siv ib puag ncig HPMC. Tsis pub dhau qee yam, muaj kev nce hauv cov ntsiab lus methoxyl yuav coj mus rau hauv cov neeg rub tawm hauv lub zog ntawm hydroxyl pawg yuav ua rau txo qis ntawm rub tawm lub zog rub tawm. hloov pauv hloov zuj zus. Muaj cov txiaj ntsig zoo sib xws rau kev qhib teev.

Qhov hloov pauv ntawm kev kho tshuab muaj zog nyob rau lub sijhawm qhib lub sijhawm yog ua raws li qhov ntawd tsis tshua muaj xwm txheej kub. HPMC nrog cov methoxyl (DS) cov ntsiab lus thiab tsawg hydroxyprropoxyl (MS) Cov ntsiab lus muaj cov tshuaj khib nyiab zoo nkauj, tab sis nws yuav cuam tshuam rau cov tshuaj pleev ntub ntawm qhov tsis sib xws. Cov khoom ntub dej cov khoom.


Lub Sijhawm Post: Feb-14-2025