Analysis of current standards for interior and exterior wall coatings in China

wallpapers Industry 2020-12-09
At present, the

standard for coating detection in China is: synthetic emulsion exterior wall coating GB/T9755-1995; synthetic emulsion interior wall coating -- GB/T9756-1995; GB/T18582-2001

.

for the exterior wall architectural coating, people are more concerned about the aging resistance of the coating, because the exterior wall coating is exposed to the atmosphere and is subjected to severe environmental test, so it needs to have good aging resistance. The national standard detection adopts xenon lamp artificial accelerated aging method to detect. The current standard is: qualified products 200 hours; first class products 250 hours. For the interior wall architectural coatings, people are most concerned about the washability of the coatings, and the national standard also adopts the method of artificial accelerated detection. At present, the national standard requires more than 300 times. In addition,

and

also include the state in the container, workability, coating appearance, drying time, alkali resistance, freeze-thaw resistance, temperature denaturation resistance and crack resistance elongation of the coating.

and

should be said that the domestic test standards are very low, much lower than the standards of foreign developed countries, for example: the aging resistance in foreign countries is generally required to be more than 500 hours.

gb18582-2001 (limit of harmful substances in interior wall coatings)

1. The content of volatile organic compounds (VOC) in the product should be less than 200g / L;

2. During the production process of the product, the compounds containing heavy metals should not be added artificially, and the total content should be less than 90mg / kg (based on lead);

Formaldehyde and formaldehyde polymer should not be added artificially in the production process, and the content should be less than 100mg / kg.


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