Coating technology: Determination of flash point of coating and related products

Core tip: the flash point (closed cup) of the coating, that is, the lowest temperature at which the escaping steam can flash in the presence of flame when heating the coating product sample in the closed cup under the conditions specified in the standard, is called the flash point value of the coating Flash point principle of coating: Heat the sample in the closed cup at the horizontal position specified in the designed closed cup immersion water bath pot The temperature difference between the liquid in the water bath and the sample in the closed cup shall not be greater than 2 ℃, and the temperature of the water bath shall be increased slowly, and the heating process shall ensure that the temperature of the sample rises within 1.5min 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 flash point (closed cup), that is, under the conditions specified in the standard, when heating the paint product sample in the closed cup, the vapor escaping under the presence of the flame can flash at the lowest temperature in an instant, known as the paint flash point value Flash point principle of coating: heat the sample in the closed cup at the horizontal position specified in the designed closed cup immersion water bath pot The temperature difference between the liquid in the water bath and the sample in the closed cup shall not be greater than 2 ℃, and the temperature of the water bath shall be increased slowly, while the heating process shall ensure that the temperature of the sample rises within 1.5min, not more than 50 ℃ (see note ①) During heating, ignition inspection shall be carried out at intervals of not less than 1.5min (see note ②) Pay attention to the minimum temperature when the flash occurs, and determine the flash point of the test product according to the temperature and the minimum temperature repeatedly measured, and correct to the flash point value under atmospheric pressure of 101.3kPa (1013-bar or 760mmhg) Note: ① in order to ensure that some coating products with poor heat transfer or high consistency are tested under the condition of close balance, a slow heating speed is required ② In order to ensure that the space above the sample recovers to the vapor saturation concentration after each ignition test, a minimum time interval of not less than 1.5min is required Flash point testing instrument for coating: sampling and sample processing of the flash point tester for coating shall be in accordance with the national standard GB 3186-82 sampling of coating products, and representative coating samples shall be taken from the coating products to be tested Before the test, the sample shall be placed in a closed container, and the empty volume in the container shall not exceed 10% of the total volume of the container The samples shall not be stored in plastic bottles (such as polyethylene, polypropylene, etc.) As volatile components are easy to lose, the sample should be cooled to at least 10 ℃ lower than the expected flash point before opening the sample container to take out the sample, and only the minimum mixing treatment is allowed for the sample to ensure its uniformity After taking out the sample, immediately cover the container to ensure that the loss of volatile components in the container is minimized Otherwise, the sample is not suitable for further test Put the sample into the paint flash point tester, measure it several times, and get the average value 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,