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Test method for paint adhesion
Paint adhesion is an important indicator for judging the quality of paint and coatings. Here, this paper focuses on the determination method of paint adhesion and the test operation process. For more information, please consult. Paint adhesion test method: Paint adhesion refers to the ability of the paint film and the surface to be coated or the ability of the coating to bond with each other. Adhesion is an important technical indicator, and it is the premise for the paint film to have a series of properties. The common test method is to use a paper cutter to draw a 15X15mm grid within the range of 50X100mm on the paint surface, and then stick the tape on the painted surface with the grid. Press with a stick or finger with a load of 500G, then hold one end of the tape and pull the tape away in a rapid and sudden manner in a direction perpendicular to the surface of the coating to check whether the coating is peeled off by the tape. If no peeling occurs, it is considered acceptable. If peeling occurs between the coatings, it is also considered acceptable. If peeling occurs between the metal and the coating, it is considered unqualified. The factory's professional test is to use a hundred grid test. The tool is a hundred grid knife. The width of the knife edge is about 10mm~12mm. Every 1mm~1.2mm is an interval. There are 10 grids in total. When a straight line is drawn, 10 straight line knife marks with the same interval will appear. , and draw the vertical position of the straight line knife mark, it becomes a 10*10 square of 100 grids. After the 100 grid knife is finished, you must use tape to test whether it will fall off. First, stick the tape to the 100 grid position, press down with your fingers to stick the tape tightly, and then tear off the tape with an instant force. Visual material Whether the paint on it has peeled off In addition, not just any tape can be used. According to the JIS standard, it is necessary to specify the brand and model. Precautions for paint adhesion test: 1. The incision should penetrate the coating, but the incision into the substrate should not be too deep. The test is invalid if the coating is too thick and hard to penetrate the substrate. 2. The tape is generally a 25mm wide translucent tape, and the backing material is polyester film or acetate fiber. Stick the tape on the entire grid, and then tear it off at a small angle. The result can be obtained according to the proportion of the glued area on the surface of the paint film. 3. The test should be performed at a temperature of 23±2°C and relative humidity 50±5% paint adhesion test standard: a total of five grades, adhesion≥4B is qualified. 5B-The edge of the scribed line is smooth, and there is no paint peeling off at the edge and intersection of the scribed line; 4B-A small piece of paint peels off at the intersection of the scribed line, and the total peeling area is less than 5%; 3B-On the scribed line Small pieces of paint peel off at the edges and intersections, and the total peeling area is between 5% and 15%; 2B - There are pieces of paint peeling off at the edges and intersections of the line, and the total peeling area is between 15% and 15%. Between 35%; 1B-Flakes of paint fall off at the edges and intersections of the scribes, and the total peeling area is between 35% and 65%; 0B-Flakes at the edges and intersections of the scribes The paint peeled off, and the total peeling area is greater than 65%. The paint adhesion test is important. It is an important standard and basis for classifying paint grades and judging quality. It is also an important indicator for judging whether a paint and coating product is a product. The paint adhesion will directly affect the decoration effect. When purchasing, we must carefully read the adhesion test level on the label of paint and coating products.
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