Typical physical properties
Appearance: Milky white liquid
Solid content: 30%
PH value: 2.0-4.0
Emulsification system: anionic
Thickening viscosity: 5000-6000cps
Terada pointed out [41: In water-based pigment dispersions, containing coexisting organic solvents, it will reduce the dispersion stability of the pigment. The degree of this decrease is related to the hydrophobic interaction between the pigment/dispersing resin. The interfacial tension (ywg) between water and coexisting solvent has a great influence on the adsorption of the resin on the pigment. The lower the interfacial tension yw., the less the amount of resin adsorbed on the pigment surface, the larger the pigment particle size, munzing pe wax the worse the stability.
It can be seen from the above examples that the solvent’s solvency and the nature of the solvent will affect the adsorption of polymer, surfactant, etc. on the surface of the pigment.
For resins, solvents, additives, etc., if two or more of them have a common adsorption center on the surface of the pigment, then competitive adsorption will occur in the dispersion. If the solvent preferentially adsorbs on the surface of the pigment, the adsorption layer will be thin. Affect the stability of the dispersion system. If this phenomenon occurs, the order of addition must be changed to allow the pigment to be combined with the resin or additive first.
The effect of the nature of the resin polymer on the adsorption Many coating resins contain active functional groups, the most important ones are carboxyl, hydroxyl, amino, etc. The resin will pass these groups
Adsorbed on the surface of the pigment.
Kobayashi Minteng 152, when studying the influence of acid/base on the dispersion properties, produced alkyd resins containing acid/base properties suitable for the dispersion of acid/base pigments.
Carbon black with acidic surface was dispersed in acidic and alkaline alkyd resin modified with melamine and hydroxyethyl ethyleneimine (HEE I) to make paint, and its 20° specular gloss value and Yield value, investigate its dispersion performance.
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