Function and market prospect of powder coatings (4 of 4)

Self healing powder coating

At present, the coating performance is mainly protected by improving resin, pigment, additive and formula technology. However, once the coating is damaged, the substrate will be corroded at the exposed part, and then the substrate protected by the coating will be corroded continuously. In 2001, polymer self-healing technology was first proposed in the Journal of natural science.

Common self-healing composites can be divided into autonomous and non autonomous self-healing mechanisms.

The self healing mechanism is usually to embed polymerizable healing agent or corrosion inhibitor in the coating to realize the self repair function;

For the non autonomous healing mechanism, the chemical reaction or physical transformation is usually caused by external heat or light stimulation, so as to realize the self-healing function. It is mainly based on the self-healing material evenly dispersed in the matrix material. When it breaks under external stress, it releases its internal repair agent to make the catalyst cross-linked and solidified with the self-healing agent and fill the wall cracks.

As a new functional coating variety in the coating market, self-healing powder coating can repair itself when damaged, has the advantages of convenience and durability, and can protect the substrate for a long time. It will be an important direction of coating development in the future. However, the manufacturing process of self-healing powder coating is more complex, so it is particularly important to develop self-healing powder coating which is convenient and conducive to industrial production.

summary

Heavy duty anticorrosive coatings and weather resistant coatings are still the mainstream trend of future development due to their wide application. Hydrophobic coatings and high temperature resistant coatings will also develop more adaptive varieties according to their corresponding application environment, and other new powder coatings for specific purposes will continue to emerge. At present, the market share of powder coatings is low, and the development of functional powder coatings is still at a low level. However, due to the performance and environmental protection advantages of functional powder coatings, they have great application prospects in the fields of automobile, ship, pipeline and construction, and have significant development space, which still needs to be explored and studied continuously.

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