Nrog rau kev tsim thiab siv cov xim latex uas yog dej, kev xaiv cov xim latex thickener tau ntau yam. Kev kho qhov rheology thiab viscosity tswj ntawm cov xim latex los ntawm qhov siab, nruab nrab thiab qis shear rates. Kev xaiv thiab kev siv cov thickeners rau cov xim latex thiab cov xim latex hauv ntau hom emulsion systems (acrylic ntshiab, styrene-acrylic, thiab lwm yam).
Lub luag haujlwm tseem ceeb ntawm cov khoom ua kom tuab hauv cov xim latex, uas rheology yog ib qho ntawm cov yam tseem ceeb uas ua rau pom thiab ua tau zoo ntawm cov zaj duab xis xim. Tsis tas li ntawd xav txog qhov cuam tshuam ntawm viscosity rau cov xim precipitation, txhuam tau, leveling, puv ntawm cov zaj duab xis xim, thiab sag ntawm cov zaj duab xis saum npoo thaum txhuam ntsug. Cov no yog cov teeb meem zoo uas cov chaw tsim khoom feem ntau coj mus rau hauv tus account.
Cov khoom sib xyaw ua ke ntawm cov txheej txheej cuam tshuam rau qhov rheology ntawm cov xim latex, thiab qhov viscosity tuaj yeem hloov kho los ntawm kev hloov pauv qhov concentration ntawm emulsion thiab qhov concentration ntawm lwm cov khoom khov uas tawg hauv cov xim latex. Txawm li cas los xij, qhov ntau thiab tsawg ntawm kev hloov kho yog txwv thiab tus nqi siab. Qhov viscosity ntawm cov xim latex feem ntau yog kho los ntawm cov thickeners. Cov thickeners siv feem ntau yog: cellulose ether thickeners, alkali-swellable polyacrylic acid emulsion thickeners, non-ionic associative polyurethane thickeners, thiab lwm yam. Hydroxyethyl cellulose ether thickener feem ntau ua rau qhov nruab nrab thiab qis shear viscosity ntawm cov xim latex, thiab muaj thixotropy loj. Tus nqi tawm los loj. Lub hydrophobic tseem ceeb saw ntawm cellulose thickener yog txuam nrog cov dej nyob ib puag ncig los ntawm kev sib txuas hydrogen, uas ua rau cov kua dej ntawm cov polymer nws tus kheej nce. Qhov chaw rau kev txav mus los dawb ntawm cov khoom me me raug txo qis. Qhov viscosity ntawm lub kaw lus raug nce, thiab cov qauv sib txuas ntawm cov xim thiab cov khoom emulsion raug tsim ntawm cov xim thiab cov khoom emulsion. Txhawm rau cais cov xim ntawm ib leeg, cov khoom emulsion tsis tshua muaj adsorb.
Lub sijhawm tshaj tawm: Kaum Ib Hlis-02-2022