8 functions of paint dispersant

2021-09-24   Pageview:151

1. Improve gloss and increase leveling effect gloss. Actually, the most important thing depends on the scattering of light on the surface of the coating (that is, a certain level of flatness is sufficient);
2. Prevent floating color and blooming;
3. Improve the tinting strength, pay attention to the tinting strength in the automatic tinting system is not as high as possible;
4. Reduce viscosity and increase pigment loading;
5. To reduce flocculation, the finer the particle, the higher the surface energy, and the higher the adsorption strength of the dispersant is required, but the dispersant with too high adsorption strength may cause disadvantages to the performance of the coating;
6. Increase storage stability;
7. Increase color development and increase color saturation;
8. Increase transparency (organic pigments) or hiding power (inorganic pigments).

 

 

 

 

 

 

 

 

 

 

 

 

High molecular polymer wetting and dispersing agent
High-molecular-weight wetting and dispersing agents refer to surface-active polymer compounds with molecular weights in the thousands or even tens of thousands. In a colloidal dispersion system, it can be adsorbed on the surface of the dispersed particles to form a strong adsorption layer, deurex pe wax making the dispersion system into a thermodynamically stable dispersion state. Therefore, a polymer dispersant must meet two different requirements at the same time.
Requirements:
①The molecule must contain a chain segment that can be dissolved and stretched in a solvent or resin solution to play a steric stabilization effect.
②The molecule must also contain an adsorption group that can be firmly adsorbed on the surface of the pigment particle. Obviously, homopolymers cannot meet these two often contradictory requirements. However, a certain form of functionalized polymer or copolymer has good conditions and may be made into an effective polymer dispersant.

Polymer wetting and dispersing agent for waterborne coatings
Polymer wetting and dispersing agents for water-based coatings generally consist of two parts, like low-molecular-weight surfactants, they are composed of a hydrophilic part and a hydrophobic part. Regarding water-based polymer wetting and dispersing agents, there is no clear classification standard. They are roughly divided into traditional polymer surfactants and polysoap compounds.

The main difference between them is: traditional polymer surfactants are generally not in water. It has the ability to form micelles and the ability to reduce surface tension is not strong. Polysoap compounds can also be said to be compounds that hydrophobically modify polyelectrolytes, and hydrophobic groups can form micelles in an aqueous solution. These two types of polymer surfactants can also be classified according to ionicity, including anionic, cationic, nonionic and amphoteric compounds.

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