Coating standard: Standard for determination of film adhesion

Core tip: film adhesion refers to the firmness of the film bonding substrate, which is evaluated by the integrity of the film within the scratch range of the rolling line, usually expressed by grade The following is the test method of film adhesion 1、 General provisions Materials and equipment are as follows: Tinplate: 50x 100x0.2-0.3mm Quadruple magnifier Paint brush: 25-35mm wide Adhesion tester: as shown in Figure 1 Specifications of relevant parts of adhesion tester are as follows: The pitch of the lead screw (9) of the test bench is 1.5mm, and its rotation is synchronous with the rotating needle Application scope and advantages of roller ceramic coating Recommended introduction: the surface of ceramic rubber plate used for roller ceramic coating is cast into durable rubber plate by hundreds of independent small ceramic pieces Each ceramic piece has raised characteristics Under general conveyor belt pressure, thousands of unique cast bumps can produce positive traction, prevent slipping and extend the service life of conveyor belt roller At the same time, the bottom layer adopts high-quality rubber, which has strong elasticity and can play a good impact resistance role The scope of application of roller ceramic coating is one three six 83857180 (the same as V) 1 Roller coating in extremely harsh working environment 2 The belt joint is not suitable for fixing with iron buckle; 3 It is suitable for leather Paint Home News: paint film adhesion refers to the firmness of the paint film bonding substrate It is evaluated by the integrity of the paint film within the scratch range of the rolling line, usually expressed by grade The following is the test method of film adhesion 1、 Generally, the specified materials and equipment are as follows: Tinplate: 50x 100x0.2-0.3mm quadruple magnifier paint brush: 25-35mm wide adhesion tester: as shown in Figure 1 The specifications o f the relevant parts of the adhesion tester are as follows: the pitch of the lead screw (9) of the test bench is 1.5mm, and its rotation is synchronous with that of the rotating needle; the rotating needle adopts the three or five brand phonograph needle, and the no-load pressure is 200g; the brick code can be placed on the load plate (1), and its weight is 1002005001000g; The turning radius of the rotary needle is adjustable, and the standard turning radius value is 5.25 mm 2、 The determination method is to prepare 3 sample plates on the tinplate (or the substrate specified in the product standard) according to the general preparation method of paint film (GB 1727-79) After the paint film is dry, the determination is carried out under the condition of constant temperature and humidity Check the needle of the adhesion tester before the test If it is not sharp, it should be replaced: lift the half nut (7) and pull out the test stand (6), then the needle can be replaced When it is found that the scratch does not conform to the standard turning radius, the turning radius shall be adjusted The method is to loosen the bolt behind the card pin plate (3) and the turning radius adjusting bolt (4) After the card pin plate is properly moved, the above bolts shall be tightened in turn The scratch is compared with the standard round roll line drawing If it still does not conform to the standard round roll line drawing, the turning radius shall be readjusted until it is the same as the standard round roll line with a turning radius of 5.25mm BI During the measurement, place the sample plate on the test bench (6), tighten the adjusting bolts (5), (8) and adjusting bolts (10) to fix the sample plate, and move the lifting rod (2) backward so that the tip of the rotating needle contacts the paint film If the scratch does not expose the bottom plate, the enamel code shall be added Shake the handle (11) evenly in a clockwise direction The rotating speed should be 80-100 rpm The standard drawing length of the round roll line scratch is 7.5 ± 0.5cm Move the lifting rod (2) forward to lift the card pin plate, loosen the bolts (5), (8) and (10) that fix the sample plate, take out the sample plate, remove the paint chips on the scratch with the paint brush, check the scratch with a quadruple magnifier and grade it 3、 The evaluation method of film adhesion test takes the upper side of the scratch on the sample plate as the inspection target, and marks seven parts successively, i.e 1, 2, 3, 4, 5, 6, 7, etc There are seven levels Check the integrity of each part of the paint film in sequence If more than 70% of the grids in a certain part are intact, it is determined that the part is intact, otherwise it shall be considered as damaged For example, Part 1 with good film and best adhesion is classified as grade I; Part 1 with bad film and Part 2 with good adhesion is classified as grade II By analogy, Grade 7 is the worst adhesion The standard scratch roll line is shown in Figure 2 The results shall be based on the level of at least two samples Note: since the implementation of this standard, the original standard hg2-462-78 is invalid Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration renderings,