Lub thickening mechanism ntawmhydroxyethyl celluloseyog ua kom cov viscosity los ntawm kev tsim cov intermolecular thiab intramolecular hydrogen bonds, nrog rau hydration thiab chain entanglement ntawm molecular chains. Yog li ntawd, txoj kev thickening ntawm hydroxyethyl cellulose yuav muab faib ua ob yam: ib tug yog lub luag hauj lwm ntawm intermolecular thiab intramolecular hydrogen bonds. Cov saw hlau hydrophobic koom nrog cov dej nyob ib puag ncig los ntawm hydrogen bonds, uas txhim kho cov dej ntws ntawm cov polymer nws tus kheej. Lub ntim ntawm cov khoom txo qhov chaw dawb txav ntawm cov khoom, yog li ua kom cov viscosity ntawm lub cev; Thib ob, los ntawm kev sib txuam thiab sib tshooj ntawm cov saw hlau molecular, cov saw cellulose yog nyob rau hauv peb-dimensional network qauv hauv tag nrho cov kab ke, yog li txhim kho cov viscosity.
Cia peb saib yuav ua li cas cellulose plays lub luag hauj lwm nyob rau hauv lub cia stability ntawm lub system: ua ntej, lub luag hauj lwm ntawm hydrogen bonds txwv tsis pub cov dej ntws, plays lub luag hauj lwm nyob rau hauv dej tuav, thiab pab tiv thaiv cov dej sib cais; Thib ob, kev sib cuam tshuam ntawm cellulose chains Cov ceg tawv entanglement tsim ib qho kev sib txuas sib txuas los yog thaj chaw sib cais ntawm cov pigments, fillers thiab emulsion hais, uas tiv thaiv kev daws teeb meem.
Nws yog kev sib xyaw ua ke ntawm ob hom kev ua haujlwm saum toj no uas ua rauhydroxyethyl cellulosekom muaj peev xwm zoo heev los txhim kho kev ruaj ntseg cia. Nyob rau hauv kev tsim cov xim latex, HEC ntxiv thaum lub sij hawm ntaus thiab dispersing tsub kom nrog kev nce ntawm sab nraud quab yuam, shear velocity gradient nce, cov molecules yog teem nyob rau hauv ib qho kev taw qhia nyob rau hauv ib tug kom sib npaug zos rau cov kev taw qhia ntws, thiab lub puab tsaig winding system ntawm cov molecular chains raug rhuav tshem, uas yog ib qho yooj yim rau zawv zawg nrog ib leeg, qhov system viscosity. Txij li thaum lub kaw lus muaj ntau ntau ntawm lwm yam khoom (pigments, fillers, emulsions), qhov kev txiav txim siab no tsis tuaj yeem rov qab kho lub xeev ntawm kev sib txuas thiab sib tshooj txawm tias nws tau muab tso rau lub sijhawm ntev tom qab cov xim sib xyaw. Hauv qhov no, HEC tsuas yog tso siab rau hydrogen bonds. Cov nyhuv ntawm dej tuav thiab thickening txo cov thickening efficiency ntawmHEC, thiab kev koom tes ntawm lub xeev dispersion no rau kev cia ruaj khov ntawm lub kaw lus kuj raug txo raws li. Txawm li cas los xij, HEC yaj tau sib cais nyob rau hauv lub kaw lus ntawm qis qis qis thaum lub sij hawm cia, thiab cov qauv tsim los ntawm kev sib txuas ntawm HEC chains tau raug puas tsuaj tsawg. Yog li qhia ntau dua thickening efficiency thiab cia stability. Obviously, ib txhij ua ntawm ob txoj kev thickening yog lub hauv paus ntawm kev thickening ntawm cellulose thiab ua kom ruaj khov cia. Hauv lwm lo lus, lub xeev yaj thiab tawg ntawm cellulose hauv dej yuav cuam tshuam rau nws cov nyhuv thickening thiab nws txoj kev koom tes rau kev khaws cia ruaj khov.
Lub sij hawm xa tuaj: Plaub Hlis-25-2024