Nrog rau kev txhim kho thiab kev siv cov xim latex dej, kev xaiv cov xim latex thickener muaj ntau haiv neeg. Kev hloov kho ntawm rheology thiab viscosity tswj cov xim latex los ntawm siab, nruab nrab thiab qis shear tus nqi. Kev xaiv thiab siv cov thickeners rau latex xim thiab latex xim nyob rau hauv txawv emulsion systems (ntshiab acrylic, styrene-acrylic, thiab lwm yam).
Lub luag hauj lwm tseem ceeb ntawm cov thickeners nyob rau hauv cov xim latex, nyob rau hauv uas rheology yog ib qho tseem ceeb ntawm cov tsos thiab kev ua tau zoo ntawm cov xim zaj duab xis. Kuj tseem xav txog qhov cuam tshuam ntawm viscosity ntawm cov xim nag lossis daus, txhuam kom zoo, theem, puv ntawm cov xim zaj duab xis, thiab sag ntawm zaj duab xis saum npoo thaum txhuam ntsug. Cov no yog cov teeb meem zoo uas manufacturers feem ntau coj mus rau hauv tus account.
Qhov muaj pes tsawg leeg ntawm cov txheej txheej cuam tshuam rau rheology ntawm cov xim latex, thiab cov viscosity tuaj yeem hloov kho los ntawm kev hloov cov concentration ntawm emulsion thiab cov concentration ntawm lwm cov khoom sib cais hauv cov xim latex. Txawm li cas los xij, qhov kev hloov kho yog txwv thiab tus nqi siab. Lub viscosity ntawm latex xim yog tsuas yog kho los ntawm thickeners. Feem ntau siv cov thickeners yog: cellulose ether thickeners, alkali-swellable polyacrylic acid emulsion thickeners, non-ionic associative polyurethane thickeners, thiab lwm yam. Hydroxyethyl cellulose ether thickener mas ua rau nruab nrab thiab qis shear viscosity ntawm latex xim, thiab muaj ib tug loj thij. Tus nqi tawm los yog loj. Cov saw hlau hydrophobic tseem ceeb ntawm cellulose thickener yog txuam nrog cov dej nyob ib puag ncig los ntawm kev sib txuas ntawm hydrogen, uas ua rau kom cov kua ntim ntawm cov polymer nws tus kheej. Qhov chaw pub dawb txav ntawm cov khoom yog txo. Lub viscosity ntawm lub system yog nce, thiab ib tug cross-linked network qauv yog tsim ntawm cov xim thiab cov emulsion hais. Txhawm rau cais cov pigments ntawm ib leeg, cov emulsion hais tsis tshua muaj adsorb.
Post lub sij hawm: Nov-02-2022