Analysis of current internal and external wall coa
2022-09-30- Detail
Analysis of China's current standards for interior and exterior wall coatings
at present, China's paint testing standards are: synthetic lotion exterior wall coatings - gb/t
synthetic lotion interior wall coatings - gb/t; GB/T
for exterior wall architectural coatings, people are more concerned about the aging resistance of the coatings, because the exterior wall coatings are exposed to the atmosphere and are subjected to severe environmental tests, which requires good 6 The aging resistance of experimental data is preserved, and the national standard is tested by manually accelerating aging with xenon lamp. This method simulates the loss of paint caused by the change of weather environment. The current standard is: 200 hours for qualified products; The first-class product is 250 hours. For interior wall architectural coatings, people are most concerned about PVC powder. In fact, SG (7) 100 is the washability of the coating. The national standard also adopts the method of manual accelerated detection. At present, the requirement of the national standard is ≥ 300 times
in addition, the test indicators also include the state in the container, workability, film appearance, drying time, alkali resistance, freeze-thaw resistance, and temperature denaturation resistance and crack elongation of the coating
it should be said that the domestic testing standard is very low, which is much lower than that of foreign developed countries. For example, the aging resistance is generally required to be more than 500 hours abroad
gb (limit of harmful substances in interior wall paint)
1. The content of volatile organic compounds (VOC) in the product should be less than 200g/l
2. During the production process, it is not allowed to artificially add compounds containing heavy metals, and the total content should be less than 90mg/kg (calculated by lead)
3. Formaldehyde and its polymer shall not be artificially added in the production process of the product, and the content shall be less than 100mg/kg
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