The dispersion of pigments is essentially the process of breaking aggregates into native particles and agglomerates, and these newly formed particles evolve and tend to a stable state. The specific dispersion process of pigments in resin can be divided into the following three steps: first, the molten resin wets the surface of pigment aggregates, and then penetrates into the pores inside the aggregates; In the second step, the aggregates undergo fragmentation under the action of external shear force and mutual collision between pigment particles; The final step is to wet and coat the newly formed particles with the resin melt until it stabilizes and no longer agglomerates. This process can be simply described as wetting, crushing, and stabilization.Today in this article, Sainuo takes you to understand the role of  ope wax  in pigments.

However, the melt viscosity of resin is high, which makes it difficult to blend with pigments and has poor wettability. As a result, it is difficult to penetrate into the pores of aggregates, and shear force cannot be efficiently transmitted, resulting in incomplete fragmentation of aggregates. Even if some aggregates are broken, the resin melt cannot quickly wet them, and particles collide with each other to undergo re aggregation, which is also the reason for the uneven dispersion of pigments and fillers in the resin system. To solve this problem, oxidized polyethylene wax can be added to the above system.

After adding oxidized polyethylene wax to the system, the resin and oxidized polyethylene wax are first melted and coated on the surface of the filler. Due to the low viscosity and good compatibility with the filler, oxidized polyethylene wax is easy to wet the filler and then penetrate into the interior of the aggregate, weakening the cohesion. Moreover, with the help of external shear force, the aggregates of pigments and fillers are more easily broken, and newly formed particles can also obtain rapid wetting and protection. Oxidized polyethylene wax not only plays a dispersing role, but also increases the mechanical properties of the coating. During the process of powder coating solidification and film formation, oxidized polyethylene wax particles will move towards the surface of the coating due to squeezing or floating, providing protection for the coating. Larger particles can resist external stress and increase the scratch resistance of the coating, while smaller particles will tightly accumulate and increase the hardness of the coating. 

Due to the large number of carboxyl groups in the structure of oxidized polyethylene wax, it has a good affinity with alkaline pigments and can promote the dispersion of pigments in the system. The structure also contains many hydroxyl groups, so it has good compatibility with polar resins. When the powder coating is solidified into a film, it can increase the impact resistance and flexibility of the coating. In addition, the addition of ope wax can reduce the viscosity of the system and improve the flowability of the system. Therefore, adding ope wax in the production of coatings can improve production efficiency and increase yield.

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