Coating process: light resistance test of coating film

Core tip: the so-called light resistance of coating film refers to the ability of coating film to maintain its original optical properties such as color and luster after being exposed to light, as long as it is divided into light retention, color retention and yellowing resistance It takes a long time to test the light resistance of coating film under natural light conditions Generally, artificial light source is used to accelerate the change of coating film and shorten the testing time (1) Light retention test: the so-called light retention is the ability of the film to maintain its original luster when exposed to light The common coating testing method is to cover part of the coating sample to be tested 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 Home of coatings: the so-called light resistance of coating film refers to the ability of coating film to maintain its original optical properties such as color and luster after being exposed to light, as long as it is divided into light retention, color retention and yellowing resistance It takes a long time to test the light resistance of coating film under natural light conditions Generally, artificial light source is used to accelerate the change of coating film and shorten the testing time (1) Light retention test: the so-called light retention is the ability of the film to maintain its original luster when exposed to light The common coating detection method is to cover a part of the tested coating plate, under the sunlight or artificial light, after a certain time of irradiation, use the photoelectric glossmeter to measure the glossiness of the non irradiated and the irradiated parts, and express the result of light retention with its ratio (2) Color retention test: color retention refers to the ability of the coating to maintain its original color under the illumination of light The commonly used coating detection method is to irradiate the tested sample in the light, and also cover part of it After a certain period of time, use the color difference meter to detect the color of the two parts The greater the difference, the worse the color retention (3) Yellowing resistance test: the paint film containing grease coating often turns yellow in the use process, and even some white paint standard plates also turn yellow in the storage process in the dark place Generally, light paint is more likely to happen Therefore, in order to prevent and judge the occurrence of yellowing in advance, it is necessary to detect the yellowing of the film The test method is to apply the sample on the frosted glass plate, put it into the dryer filled with saturated potassium sulfate solution after drying and standing, take it out after a certain period of time, measure the tristimulus value x, y, Z of the film color, and then calculate the yellowing value according to the formula D = 1.28x-1.06z/y The paint family is focused on coating, diatom mud, paint coating and coating technology, News and information of fire retardant coating, coating, diatom mud, paint coating, coating technology, decoration knowledge and decoration effect map of fire retardant coating,