Common architectural coating testing technical indicators
Architectural coatings are closely related to our lives and have a direct impact on the home life and working environment. In recent years, there have been many diseases caused by the quality problems of architectural coatings. Nowadays, families are cautious when choosing architectural coatings, but they still have to be careful. This requires everyone to understand the quality judgment standards of architectural coatings.
Common architectural coating testing technical indicators
1, water resistance
The purpose is to test the resistance of the coating film to water, that is, to immerse the cured paint film test board (the paint film on the asbestos board) in distilled water under the specified conditions, 2/3 of the paint film is in the water, 1/ 3 Above the water surface, after immersing for 96 hours, observe whether the surface of the paint film is whitish, lose light, blister, fall off, etc. If not, pass the test.
2, alkali resistance
The purpose is to test the resistance of the coating film to alkaline substances, that is, under the specified conditions, the cured paint film test board (the paint film is made on the asbestos board) is immersed in a certain concentration of alkali liquor, 2/ of the paint film. 3 In the water, 1/3 is above the water surface, after immersing for 48 hours, observe whether the paint film has whitish, lost light, foaming, falling off and so on.
3, the contrast ratio
The purpose is to test the hiding ability of the coating film on the substrate, that is, under the specified conditions, the cured test film (the paint film is made on black and white paper) is tested by reflectometer for different reflectivity on black and white paper, namely Rb and Rw. , the contrast ratio = Rb / Rw (such as: 0.87, 0.90, 0.93, 0.95, etc.).
4, stain resistance
The purpose is to test the ability of the coating film to resist atmospheric dust, that is, to test the reflectance value A of the cured test film sample (the paint film is made on asbestos) under the specified conditions, and then apply 0.7g on the paint film. Fly ash, after drying, use the specified experimental equipment to wash the paint film, repeat the same experiment five times, and test the reflectance value B of the paint film again, then the stain resistance of the paint film X=(AB)/A (such as : 20%, 15%, 10%).
5, anti-aging
(1). Natural aging: The gradual change of performance of the coating film exposed to outdoor natural conditions, such as fading, chalking, etc., but due to the long test time, it is generally not operable.
(2). Artificial accelerated aging: After the coating film is tested by artificial aging test machine, observe the changes of the paint film, such as powdering and discoloration. Artificial aging is in units of hrs, such as 250 hrs, 400 hrs, 600 hrs, and the like.
True and false architectural coating identification method
1. Look at the factory name, factory address, registered trademark, and whether there is a test report from the quality supervision department. If you are unclear, please do not buy. The key is to look at the original test certificate and the inspection report of the quality supervision department.
2, see if the product packaging is intact, shake the paint tube whether there is too much noise, the loud sound indicates that the quantity is not enough. You can check the weight of the paint and compare it to the product packaging instructions.
3. Check whether the printed matter is clear and exquisite, and whether the packaging pattern is clear and exquisite.
4. After opening the paint tube, look at the surface for impurities, and whether the whole is clear.
5. Stir to see if there is a block.
6, the smell is nose and spicy eyes.
7, see the brushing effect with or without discoloration and yellowing.
Xiao Bian reminds everyone to choose a regular store and building materials city to buy when buying architectural paint, shop around three do not because of the low price and small loss!
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