xov xwm

Cov tshuaj dispersant kuj hu ua cov tshuaj wetting thiab dispersing agent. Ib sab tes, nws muaj cov nyhuv wetting, ib sab tes, ib kawg ntawm nws cov pab pawg nquag tuaj yeem nqus tau rau ntawm qhov chaw ntawm cov xim uas raug tsoo ua cov khoom me me, thiab lwm qhov kawg yog yaj rau hauv cov khoom siv hauv paus los tsim cov txheej adsorption (cov pab pawg adsorption ntau dua, qhov txuas ntev dua, cov txheej adsorption tuab dua) los tsim cov nqi repulsion (xim dej) lossis entropy repulsion (xim yaj), yog li cov xim pigment tuaj yeem tawg thiab dai rau hauv cov xim ntev ntev kom tsis txhob rov ua dua. Qhov no ua kom ntseeg tau tias qhov chaw khaws cia ntawm lub kaw lus xim.
 
Cov hom dispersants uas siv ntau.
1. Anionic wetting thiab dispersing tus neeg sawv cev
Feem ntau ntawm lawv yog tsim los ntawm cov saw hydrocarbon tsis-polar, cov roj hydrocarbon tsis muaj nqi thiab pawg hydrophilic polar. Ob pawg no nyob ntawm ob qho kawg ntawm lub molecule, tsim cov qauv molecular asymmetric hydrophilic thiab oleophilic. Nws cov ntau yam yog: sodium oleate C17H33COONa, carboxylate, sulfate (RO-SO3Na), sulfonate (R-SO3Na), thiab lwm yam. Kev sib raug zoo ntawm anionic dispersants yog qhov zoo, thiab polycarboxylic acid polymers, thiab lwm yam kuj tuaj yeem siv rau cov txheej txheem solvent-based thiab siv dav ua cov dispersants tswj flocculation-hom.

2. Tus neeg sawv cev ntub dej thiab faib cov khoom sib kis
Lawv yog cov tshuaj uas tsis muaj polar base positively charged, feem ntau yog cov ntsev amine, cov ntsev amine quaternary, cov ntsev pyridinium, thiab lwm yam. Cov tshuaj cationic surfactants muaj zog adsorption thiab muaj cov nyhuv dispersion zoo dua rau cov pa roj carbon dub, ntau yam hlau oxides thiab cov organic pigments, tab sis nws yuav tsum tau sau tseg tias lawv tshuaj lom neeg nrog pawg carboxyl hauv cov khoom siv hauv paus, thiab tseem nco ntsoov tias lawv yuav tsum tsis txhob siv tib lub sijhawm nrog cov tshuaj anionic dispersants.

3. Tswj cov dawb radical hom hyperdispersant
Qhov thib ob, lub luag haujlwm ntawm dispersant
1. Txhim kho qhov ci ntsa iab thiab ua rau kom muaj kev sib npaug zoo.
2. Tiv thaiv kom tsis txhob muaj xim ntab thiab paj.
3. Txhim kho lub zog xim.
4. Txo qhov viscosity thiab ua kom cov xim ntxiv.
5. Txo cov flocculation, ua kom muaj kev tsim kho thiab siv tau yooj yim.
6. Tiv thaiv kom tsis txhob rov ua dua thiab ua kom ruaj khov ntawm kev cia khoom.
7. Ua kom xim sib kis thiab xim saturation ntau ntxiv.
8. Ua kom pom tseeb lossis npog lub hwj chim.
9. Txhim kho kev sib tsoo zoo thiab txo cov nqi tsim khoom.
10. Tiv thaiv kom tsis txhob poob qis.