In the Coating industry, fineness of grinding is a crucial mass index, which is directly related to the film formation mass of Coating, the Gloss, durability of the paint film and the storage stability of Coating. This article will discuss the concept of fineness of grinding, Measuring method and its key role in Coating production.
Fineness of ground concept
Fineness of grind is an important measure of Color and dispersion in Coating, which reflects the maximum particle size of pigment aggregates in Coating. Specifically, fineness of grind is a reading obtained by Fineness of Gauge under specified test conditions, which indicates the depth of a groove somewhere in Fineness of Gauge, that is, the size of the solid particles protruding from the depth of the groove in the Coating. These solid particles are usually pigment or Miscellaneous dispersed solid components.
In Coating production, the measurement of fineness of grinding is not for the size of individual pigments or particle sizes, but for the size of coacervation groups that exist after the pigment is ground dispersed during the production process. The size of these coacervation groups directly affects the uniformity, flowability and final film mass of the Coating. Therefore, accurate measurement of fineness of grinding is essential to ensure Coating mass.
Influencing factors
Fineness of grinding has a significant impact on the performance and mass of coatings, the following are some of the main factors:
Film formation mass
Fineness of grinding directly affects the film formation mass of Coating. When the fineness of grinding is large, there are large particle groups in Coating, which may lead to uneven surface of the paint film and reduce the film formation mass.
Gloss of paint film
Fine particles disperse more uniformly in the Coating, helping to produce a beautiful Gloss paint film. Conversely, rough fineness of grinding can lead to uneven Gloss.
Durability
Fineness of grinding is also related to the durability of coatings. Smaller particles help improve the weathering resistance and corrosion resistance of the paint film.
Storage stability
Coating pigment coacervation size also affects storage stability. Smaller particles are more easily dispersed, making the Coating more stable.
Measuring method of grinding fineness
In the Coating industry, there are many ways to measure fineness of grinding, and one of the commonly used methods is the Grindometer method. The following are the basic principles and operation steps of the Grindometer method:
It is necessary to prepare a flat test surface, usually using a special test plate or Glass sheet.
Coatings to be tested are evenly applied to the test surface to ensure that the coating is uniform and sufficient.
Use Grindometer to scrape the Coating vertically. The drawdown blade angle of the drawdown blade and the applied pressure are key to ensure accurate measurements.
Immediately observe the scraped Coating surface at an appropriate angle. Where significant particles appear on the Coating surface, read the scale value on the Grindometer. This value is usually expressed in microns (μm), the reading of fineness of ground.
Record the measured fineness of ground readings and ensure that the conditions tested and the Coating Sample information are indicated.
Fineness of grind plays a key role in the Coating industry, and it is directly related to the mass, performance and stability of Coatings. By measuring fineness of grind, Coating manufacturers can ensure that the product has good film formation mass, gloss and durability. At the same time, it also helps to improve the storage stability of Coatings, ensuring that the product maintains stability during long-term storage. Therefore, at all stages of Coating production, the measurement of fineness of grind is an integral part, which is essential to ensure Coating mass and market competitiveness. By accurately measuring fineness of grind, we are able to gain insight into the intrinsic characteristics of Coatings, improve Coating quality, and ensure that Coatings perform well in various applications.
