Coating technology: testing of coating hardness

Core tip: coating hardness: an important performance index indicating the mechanical strength of the coating, which can also be understood as the resistance when the coating is penetrated by another hard object The hardness of the coating generally depends on the type of paint and the degree of curing There are many methods to test the hardness of coating (such as pencil hardness method and indentation method) At present, pencil hardness method is generally used in our laboratory The principle of all pencil hardness testers is the same They use a 45 degree angle and exert a certain force to push the pencil to draw a straight line in the coating The hardness of the coating is determined by the pencil type of the first series Paint knowledge | precautions for wall paint color selection Recommended introduction: when painting the wall, the owner sometimes has difficulty in choosing what color of the wall paint to paint In fact, there is no ugly color in the wall paint, only the disharmonious color matching The use of wall color contains the knowledge of health Too strong color will stimulate people's perception, make people have a sense of fidgety, affect people's mental health Grasp the basic principles of wall color and paint a colorful space 1、 Wall paint color selection notice 1 Light color is generally used for the top surface Light colors make people feel light, dark colors make people feel heavy Usually, the treatment of rooms is from top to bottom, from shallow to deep For example, the ceiling and walls of rooms are white and Coating home news: coating hardness: an important performance index indicating the mechanical strength of the coating, which can also be understood as the resistance when the coating is penetrated by another hard object The hardness of the coating generally depends on the type of paint and the degree of curing There are many methods to test the hardness of coating (such as pencil hardness method and indentation method) At present, pencil hardness method is generally used in our laboratory The principle of all pencil hardness testers is the same They use a 45 degree angle and exert a certain force to push the pencil to draw a straight line in the coating The hardness of the coating is determined by the type of pencil in the first series The hardness of the coating is measured from soft to hard, and the hardness of the coating is the hardness of the coating before the coating is damaged 1 Use the pencil designated by the customer and use 400 × sandpaper to grind the end of the pen flat (cylindrical) 2 Insert the pencil into the tube of the pen holder, make the center of the pen roughly flush with the table and then lock it 3 Place the pen holder assembly on the surface of the test piece and push a scratch horizontally forward 4 Use an eraser to wipe the scribed line to see if there is any scratch If there is no scratch, it is qualified Pencil hardness from low to high: 6B, 5b, 4b, 3b, 2b, B, Hb, F, h, 2h, 3h, 4h, 5h, 6h, 7h, 8h, 9h note: the speed of the pen holder should be uniform in the process of pushing (at least about 10 mm according to different requirements, and three different parts should be tested, each time the pencil should be rotated, the pen head must be sharp) necttype = "rect" O: extrusio NOK = "F" Style = "margin top: 0px; margin right: 0px; margin bottom: 0px; margin left: 0px; padding top: 0px; padding right: 0px; padding bottom: 0px; padding left: 0px; word wrap: break word; line height: 25px;" > paint home is dedicated to coating materials, diatom mud, paint coating, coating technology, news information and coating of fireproof coating, diatom mud, paint coating, coating technology, Decoration knowledge and effect drawing of fireproof coating,