Dab tsi yog Cov Haujlwm Ntawm Dispersants
Feb 19, 2024
Ib tug dispersant yog ib tug interfacial active neeg sawv cev uas nthuav tawm ob qho tib si oleophilic thiab hydrophilic zog nyob rau hauv ib tug molecule. Nws tuaj yeem faib ua cov khoom sib txawv ntawm cov khoom tsis zoo thiab cov organic pigments uas nyuaj rau yaj hauv cov kua, thaum tseem tiv thaiv kev teeb tsa thiab agglomeration ntawm cov khoom, tsim cov reagents uas yuav tsum tau ua kom ruaj khov.
Kev ua haujlwm ntawm dispersants yog tshwm sim hauv cov hauv qab no:
1. Siv wetting dispersants kom txo tau lub sij hawm thiab lub zog uas yuav tsum tau ua kom tiav cov txheej txheem dispersion, stabilize lub dispersed pigment dispersion, txhawb PP adhesion, hloov cov khoom nto ntawm cov xim pigment, thiab kho cov kev txav ntawm cov xim xim.
2. Txo cov kev sib tshuam ntawm cov kua thiab cov kua ua kua. Dispersants kuj yog surfactants. Cov hom dispersants muaj xws li anionic, cationic, non-ionic, zwitterionic, thiab polymeric. Ntawm lawv, hom anionic feem ntau siv.
3. Dispersants yog cov khoom siv ntxiv uas tuaj yeem txhim kho thiab txhim kho kev ua haujlwm ntawm cov khoom tawg los yog kua.
Ib tug dispersant yog ib tug interfacial active neeg sawv cev uas nthuav tawm ob qho tib si oleophilic thiab hydrophilic zog nyob rau hauv ib tug molecule. Nws tuaj yeem sib cais cov khoom thiab cov kua ua kua ntawm cov xim tsis muaj zog thiab cov organic pigments uas nyuaj rau yaj hauv cov kua, thaum tseem tiv thaiv cov khoom me me thiab kev sib sau ua ke, tsim cov amphiphilic reagents xav tau rau kev ncua ruaj khov. Dispersants thiab thickeners yog indispensable additives nyob rau hauv dej-raws li txheej. Associative thickeners muaj lipophilic thiab hydrophilic pawg, uas ua zoo li polymeric surfactants. Associative thickeners tsis tsuas yog qhia txog tus cwj pwm zoo sib xws nrog cov surfactants, tab sis kuj cuam tshuam nrog cov khoom qub lossis zoo sib xws. Kev siv dav siv polymer txheej dispersant yog qhov tshwj xeeb ntawm interfacial active neeg sawv cev. Cov dispersant thiab cov thickener cuam tshuam yog nyob rau hauv tib lub nruab nrab aqueous thiab muaj kev sib tw adsorption ntawm cov xim thiab cov tshuaj pleev ib ce. Muaj kev sib tw nyuaj ntawm ob qho tib si.
