Coatings play an important role in modern manufacturing, not only to have excellent painting performance, but also to meet the requirements of product Appearance and mass. In the Coating industry, leveling and sag performance testing is essential to ensure the mass of Coatings. This article will introduce the testing methods of Coating flow and sag performance and their importance.
1. leveling test
Leveling refers to whether the film can flow from irregular and uneven surface to smooth and smooth surface after Coating in Spreader. Leveling directly affects the Appearance mass and decorative effect of the film.
Test method: The levelling test is usually evaluated using brushing and lame plating.
Brushing method: This method involves applying the sample to a smooth surface according to the specified viscosity, and then brushing the mark with a brush in the middle of the film. The time required to observe the disappearance of the brush mark is assessed as leveling, usually expressed in fractions, and the better leveling will disappear in a shorter time.
Lame plating: The leveling test of the lame plating method involves observing the time it takes for the Coating surface to become uniform, smooth, wrinkle-free, and orange peel-free. Qualified Coatings will achieve a uniform and smooth surface within a specified time.
2. Sagging test
The sag property refers to the phenomenon that the surface of the wet film falls downward under the influence of gravity when the Coating is constructed on a vertical surface. The sag property test helps to evaluate the flow characteristics and adaptability of the Coating.
Test method: The sag performance test is usually carried out using the Sag Tester. In this test, the Coating is applied to the test plate, and then the test plate is placed vertically to observe the falling phenomenon of the wet film and record it. The test results will be compared with the requirements specified in the product standard to determine whether the sag performance meets the requirements.
3. Importance
Appearance mass: The leveling and sagging performance directly affect the Appearance mass of the film. Excellent levelling performance can ensure that the surface of the film is smooth and defect-free, and improve the decorative and aesthetic appearance of the product.
Reduce painting problems: By testing leveling and sag performance, potential painting problems, such as sag, runes, ripples, etc., can be detected early, so that appropriate measures can be taken to repair or optimize the Coating formula.
Improve production efficiency: Coatings with good leveling and sagging performance are easier to construct, reduce problems and corrective work during construction, and improve production efficiency.
Product mass assurance: By testing leveling and sagging performance, we can ensure that the mass of Coating meets product standards and customer requirements, and provide high-quality painting products.
In the Coating industry, leveling and sag performance tests are key steps in ensuring Coating mass and performance. Through these tests, manufacturers can assess Coating suitability, improve painting efficiency, and ensure that the final product's Appearance mass meets requirements. Therefore, leveling and sag performance tests play an integral role in Coating engineering.
