Powder coatings are widely used in industry, but in practical applications, incompatibility problems due to mixing different kinds of powder coatings often occur. This incompatibility can affect the surface quality, mechanical properties and other important properties of the coating. Therefore, it is essential to determine and analyze the compatibility of powder coatings. This determination method and its applications will be discussed in detail in this article.
I. Measurement scope and purpose
The determination method of powder coating compatibility aims to determine the quality change trend of the coating surface after the mixing of two different powder coatings. This change may be manifested as a change in gloss, the appearance of pinholes, orange peel, shrinkage holes, lumping or color mixing. And this change in appearance largely depends on the chemical reactivity, chemical composition and melting performance of the powder coating. In addition, the mixing ratio is also a key factor, which determines the beginning, nature and degree of change.
II. Determination of materials and equipment
To ensure the accuracy and consistency of the determination, the following materials and equipment are required:
Clean and degreased steel plate with a hole at one end for hanging the plate, made according to ISO 1514.
A powder spraying system consisting of a corona charged gun or a friction charged gun with an appropriate powder collection device and an exhaust powder spray cabinet.
A clean container or plastic bag for loading large amounts of powder coatings.
An oven for baking test plates.
Analytical balance, accurately weighed to 10mg.
III. Determination method
The assay involves the following steps:
Mix the different powder coatings in a predetermined proportion.
The mixture was applied to a standard test plate using a powder coating system.
Bake the coated plate in an oven.
Observe and record the incompatibility of the coating surface.
IV. Display of results
The description of the appearance of the coating can be made by text, but when a quantitative measurement of gloss is required, a digital form should be used. Because even a small amount of contamination can cause a large change in gloss, it is recommended to draw a graph of gloss measurements. This kind of chart can clearly show the effect of one powder on another at a low concentration.
V. Precision
In non-quantitative measurements, precision data may not be applicable. The precision of gloss measurement can be referred to ISO 2813.
VI. 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 during production and coating. In addition, this measurement method can also be used to develop new coating formulations to ensure their performance and stability.
VII. Conclusion
The compatibility of powder coatings is one of the key factors that determine their application effect. Systematic determination and analysis of them can not only ensure product quality, but also provide strong support for the research and 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 compatibility research and application will have a profound impact on the future coating industry.
