Powder coatings are widely used in industry, but in practical applications, incompatibility problems often occur due to mixing different kinds of powder coatings. This incompatibility can affect the surface quality, mechanical properties and other important properties of the coating. Therefore, it is very important to measure and analyze the compatibility of powder coatings. This method and its application will be discussed in detail.

Compatibility determination of powder coatings: methods, effects and applications

1. Measurement range and purpose

The purpose of this method is to determine the quality variation trend of the coating surface after mixing two different powder coatings. This change may be manifested as a change in gloss, the appearance of pinholes, orange peels, shrinkage holes, lumping, or color mixing. This change in appearance largely depends on the chemical reactivity, chemical composition and melting properties of powder coatings. In addition, the mixing ratio is also a key factor, which determines the beginning, nature and extent of change.

2. Measuring materials and equipment

To ensure the accuracy and consistency of the determination, the following materials and equipment are required:

Clean and oiled steel plate with a hole for hanging at one end, made in accordance with ISO 1514.

Powder spraying system consisting of corona charged spray gun or friction charged spray gun, equipped with appropriate powder collection device and exhaust powder cabinet.

Clean containers or plastic bags for carrying large amounts of powder coatings.

Oven for baking test plates.

Compatibility determination of powder coatings: methods, effects and applications

Analyze the balance and weigh accurately to 10mg.

Compatibility determination of powder coatings: Methods, effects and applications Figure 1

3. Determination method

Determination involves the following steps:

Mix different powder coatings in predetermined proportions.

The mixture is applied to the standard test plate using a powder coating system.

Bake the coated test plate in the oven.

Observe and record the incompatibility of the coating surface.

Compatibility determination of powder coatings: methods, effects and applications

4. Result presentation

The description of the appearance of the coating can be done by text, but when a quantitative measurement of gloss is required, a digital form should be used. Because even trace contamination can cause large changes in gloss, it is recommended to chart the gloss measurements. This chart can clearly show the effect of one powder on another powder at low concentrations.

5. Precision

Precision data may not be applicable in non-quantitative measurements. The precision of gloss measurement can be referred to ISO 2813.

6. Application and importance

The compatibility measurement of powder coatings is very important for industrial production, it can predict the problems that may occur when different powder coatings are mixed, and help enterprises avoid unnecessary losses in the production and painting process. In addition, this determination method can also be used to develop new coating formulations to ensure their performance and stability.

7. Conclusion

The compatibility of powder coating is one of the key factors to determine its application effect. Its systematic determination and analysis can not only ensure product quality, but also provide strong support for the development and optimization of coatings. With the advancement of science and technology and the development of the market, the demand for powder coatings will continue to grow, therefore, strengthening the compatibility research and application will have a profound impact on the future coating industry.