What is a wetting dispersant? What role can it play in UV coating?

Lencolo 2022-08-03 966

Dispersant is a kind of intermolecular active agent with opposite properties of both lipophilic and hydrophilic. It can evenly disperse the solid and liquid particles of inorganic and organic pigments that are difficult to dissolve in liquid, and it can also prevent the settlement and condensation of particles to form amphiphilic reagents needed for stable suspension.

The function of dispersant is to use wetting dispersant to reduce the time and energy needed to complete the dispersion process, stabilize the dispersed pigment dispersion, modify the surface properties of pigment particles, and adjust the motion of pigment particles. Specifically reflected in the following aspects:

1, improve the luster, increase the leveling effect of the actual luster mainly depends on the surface of the paint to light scattering (that is, a certain degree of flatness can be. Of course, the detection instrument needs to determine whether it is smooth enough, considering not only the number and shape of the original particles, but also the way they are combined). When the particle size is less than 1/2 of the incident light, it will behave as refracted light, and the luster will not improve, and the covering power, which is mainly provided by scattering, will not increase. Note: The incident light refers to the range of visible light leveling can not be said; But pay attention to the reduction of the original number of particles, is to reduce the structural viscosity, but the increase of the surface will reduce the amount of free resin, whether there is an equilibrium point to say, but the general powder coating leveling is not the finer the better.

2, prevent floating color flower.

3, improve the coloring power pay attention to the coloring power in the automatic color system is not the higher the better.

4. Reduce viscosity and increase pigment loading.

5, reduce flocculation is so, but the finer the particle surface energy is higher, the need for higher adsorption strength of dispersant, but the adsorption strength is too high dispersant may cause adverse to the performance of the film.

6. The reasons for increasing storage stability are actually similar to the above. Once the stability strength of dispersant is not enough, the storage stability becomes worse.

7. Increase color development, increase color saturation, increase transparency (organic pigments) or cover power (inorganic pigments).

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