1. Inorganic thickener
Feem ntau siv yog cov organic bentonite, nws lub ntsiab yog montmorillonite. Nws cov qauv tshwj xeeb lamellar tuaj yeem ua rau cov txheej txheem muaj zog pseudoplasticity, thixotropy, ncua kev ruaj ntseg thiab lubricity. Lub hauv paus ntsiab lus ntawm thickening yog cov hmoov absorbs dej thiab swells kom thicken cov dej theem, yog li nws muaj ib tug tej yam dej tuav.
Qhov tsis zoo yog: cov dej ntws tsis zoo thiab kev ua haujlwm zoo, tsis yooj yim rau disperse thiab ntxiv.
2. Cellulose
Feem ntau siv yog hydroxyethyl cellulose (HEC), uas muaj cov thickening efficiency, zoo ncua kev kawm ntawv, dispersion thiab dej tuav cov khoom, feem ntau yog rau thickening theem dej.
Qhov tsis zoo yog: cuam tshuam rau cov dej tsis kam ntawm cov txheej txheem, kev ua haujlwm tsis txaus los tiv thaiv pwm, thiab kev ua haujlwm tsis zoo.
3. Acrylic
Acrylic thickeners feem ntau muab faib ua ob hom: acrylic alkali-swellable thickeners (ASE) thiab associative alkali-swellable thickeners (HASE).
Lub hauv paus ntsiab lus thickening ntawm acrylic acid alkali-swellable thickener (ASE) yog dissociate lub carboxylate thaum lub pH hloov mus rau alkaline, kom cov molecular saw txuas ntxiv los ntawm ib tug helical mus rau ib tug pas nrig los ntawm isotropic electrostatic repulsion ntawm carboxylate ions, txhim kho lub Lub viscosity ntawm aqueous theem. Hom thickener no kuj muaj cov thickening efficiency, muaj zog pseudoplasticity thiab zoo ncua kev kawm ntawv.
Lub associative alkali-swellable thickener (HASE) qhia txog cov pab pawg hydrophobic raws li cov alkali-swellable thickeners (ASE). Ib yam li ntawd, thaum lub pH hloov mus rau alkaline, tib-poj niam txiv neej electrostatic repulsion ntawm carboxylate ions ua rau cov saw molecular extends los ntawm ib tug helical zoo mus rau ib tug pas nrig, uas ua rau kom lub viscosity ntawm cov dej theem; thiab cov pab pawg hydrophobic qhia rau ntawm cov saw tseem ceeb tuaj yeem koom nrog cov khoom siv latex kom nce viscosity ntawm emulsion theem.
Disadvantages yog: rhiab rau pH, tsis txaus txaus thiab theem ntawm cov xim zaj duab xis, yooj yim rau thicken tom qab.
4. Polyurethane
Polyurethane associative thickener (HEUR) yog hydrophobically hloov kho ethoxylated polyurethane dej-soluble polymer, uas belongs rau non-ionic associative thickener. Nws muaj peb ntu: hydrophobic puag, hydrophilic saw thiab polyurethane puag. Lub hauv paus polyurethane nthuav dav hauv cov tshuaj pleev xim, thiab cov saw hlau hydrophilic ruaj khov hauv cov dej theem. Lub hauv paus hydrophobic koom nrog cov qauv hydrophobic xws li latex hais, surfactants, thiab pigments. , tsim ib tug peb-dimensional network qauv, thiaj li mus cuag lub hom phiaj ntawm thickening.
Nws yog tus cwj pwm los ntawm cov thickening ntawm emulsion theem, zoo heev ntws thiab theem kev ua tau zoo, zoo thickening efficiency thiab ruaj khov viscosity cia, thiab tsis muaj pH txwv; thiab nws muaj qhov pom tseeb zoo hauv dej tsis kam, gloss, pob tshab, thiab lwm yam.
Qhov tsis zoo yog: nyob rau hauv nruab nrab thiab qis viscosity system, cov nyhuv tiv thaiv ntawm cov hmoov tsis zoo, thiab cov nyhuv thickening yog yooj yim cuam tshuam los ntawm dispersants thiab cov kuab tshuaj.
Post lub sij hawm: Dec-29-2022