Pre-coated coil coatings resistance test
Pre-applied coil coatings need to be resistant to a variety of environmental conditions to ensure they maintain consistent performance and appearance during use. Pre-applied coil coatings play an important role in a variety of industrial and household applications. However, facing the challenges of different environmental conditions and usage scenarios, it is crucial to ensure the performance and durability of coatings. In order to evaluate the performance of coatings under various conditions, it is essential to conduct a series of resistance tests. The following is a detailed introduction to the test methods and standard requirements for different resistance aspects:
Acid and alkali resistance:
For solvent-based and water-based pre-coated coil coatings for construction, solvent-based and water-based pre-coated coil coatings for home appliances, and other types of solvent-based and water-based pre-coated coil coatings, tests are conducted according to Method C in GB/T 9274-1988 .
For powder-type pre-coated coil coatings for construction and home appliances, test according to Method A in GB/T 9274-1988.
After the specified time, place the test panels under natural sunlight or artificial sunlight to observe the coating. If at least two test panels have no coating defects, they will be rated as "no abnormality". Otherwise, according to GB/T 1766-2008 Give a description.
Self-cleaning properties:
Test according to the provisions of 5.4.2 in GB/T 31815-2015.
Salt spray resistance:
For solvent-based and water-based pre-coated coil coatings for construction, other solvent-based and water-based pre-coated coil coatings, and powder-based pre-coated coil coatings for construction and home appliances, tests shall be carried out in accordance with the regulations of GB/T 1771-2007.
The same test method is used for solvent-based and water-based pre-coil coatings for appliances.
Before the test, X-shaped scratches and V-shaped cuts are made on the test plate according to the provisions of GB/T 30786-2014, and the evaluation is carried out according to the standard method.
Resistance to artificial weathering:
According to different light sources, they are tested according to the regulations in GB/T 23987-2009 and described according to GB/T 1766-2008.
Low temperature resistance:
Place the test panel in a low-temperature box, and adopt different observation and testing methods according to different types of coatings, including visual observation under natural sunlight or artificial sunlight, reverse impact test, T-bend test, etc.
Heat resistance:
Testing is carried out in accordance with the provisions of GB/T 1735-2009, including placing the test panel at the specified temperature and observing the coating under natural daylight or artificial daylight.
High-low temperature resistance test:
The test panels were alternately exposed to low and high temperatures, and the coating condition was observed after multiple cycles, and relevant mechanical property tests were conducted.
Boiling water resistance, moisture resistance and contamination resistance:
Conduct corresponding experiments according to different test standards, including placing the test panel in boiling water, exposing it to a humid environment, and measuring color difference values ââbefore and after the test.
Resistance to artificial perspiration and detergents:
Test according to the regulations in GB/T 33394-2016 and GB/T 9274-1988 to evaluate the performance of the coating in artificial sweat and detergents.
In summary, durability testing of pre-applied coil coatings is a critical step in assessing their performance and suitability. These tests cover many aspects, including acid resistance, alkali resistance, self-cleaning, salt spray resistance, artificial weathering resistance, low temperature resistance, heat resistance, high-low temperature resistance, boiling water resistance, moisture resistance properties, pollution resistance, etc. Through these tests, we can comprehensively understand the performance of coatings under different environmental conditions, and provide users with reliable product selection basis to ensure the stability and durability of coatings in various application scenarios.
