Coating fineness of ground - Fineness gauge

Fineness of grinding, an important measure of color and dispersion in a paint, is measured by a scraper Fineness Meter. Under the specified test conditions, the maximum particle size of pigment aggregates in the coating can be indirectly assessed by taking the readings on the scraper finer. In this article, we will delve into the significance, influence, and determination methods of fineness of grind.

Grinding fineness is one of the important intrinsic qualities of coatings, which has an important impact on the quality of film formation, the gloss and durability of the paint film, and the storage stability of the coating. The measured fineness value is not the size of a single pigment or a pigment particle, but rather the size of the agglomeration that exists after the pigment is ground and dispersed in the paint. Therefore, the measurement of grinding fineness can be used to evaluate the degree of qualification of grinding in coating production, to compare the rationality of different grinding procedures, and to compare the efficiency of the grinding equipment used.

Method for determining fineness of grinding

Taking the scraper fineness gauge assay as an example, the principle is to use the wedge-shaped groove on the scraper fineness gauge to scrape a wedge-shaped layer of paint, and use the naked eye to identify the prominent position of the particles in the wet film to obtain a fineness reading. The steps are as follows:

1. The specimen is dropped into the deepest part of the groove of the scraper fineness gauge.

2. Use a scraper to scrape the specimen perpendicularly across the entire length of the groove.

3. Immediately observe at a 150° angle of view, and find out the scale value of the judgment point is the fineness of the sample, which is expressed in microns (μm).

Grinding fineness is of great significance in the production of coatings, which directly affects the quality and performance of coating products. By determining the fineness of grinding, we can assess the degree of acceptance of the grinding in the production of coatings and optimize the production process to improve the consistency and stability of the product. Therefore, the method of determining the fineness of grinding and its application has important research value in the coating industry.