Powder coatings are widely used in the modern painting industry. Like Miscellaneous polymer materials, powder coatings will also experience various irreversible damage phenomena over time, such as discoloration, loss of light, chalking, cracking, etc. Therefore, comprehensive and systematic testing of their performance is particularly important.
1. Impact resistance
Impact resistance refers to the degree of deformation of the film under high-speed load, reflecting the resilience of the film and the adhesion to the substrate. The state of the coating after being subjected to specific Impact energy is detected by positive and recoil, such as crazing, peeling, etc. The thickness and surface preparation of the film and substrate will affect the result of Impact strength.
2. humidity resistance
The humidity resistance of the film reflects its stability in a high temperature and high humidity environment, and is also an important indicator for evaluating its corrosion resistance. In order to ensure the accuracy of the measurement, a special Conditioning box is required, as well as distillation water and metal plate samples that meet specific requirements. The humidity resistance of the film can be obtained by exposing the test plate to a thermostatic and humid environment and rating it according to the degree of damage to the coating Appearance.
3. Resistant to neutral salt spray performance
This method is mainly to evaluate the stability of the coating in the salt fog environment. First, a certain concentration of sodium chloride solution needs to be prepared, and the pH value of the solution is ensured to be between 6.5 and 7.2. Using Salt Spray Tester, the test plate is exposed to a neutral salt spray, and then evaluated according to the degree to which the coating is affected by salt fog.
4. Resistance to liquid media
This test examines the resistance of film or painting specimens to liquids, including immersion, absorbent media, and drip methods. Different panel materials, such as tinplate, steel, and Aluminum Panels, have specific specifications and pretreatment requirements to ensure test Reliability.
5. Water resistance test
The water resistance is to evaluate the stability of the film in the water environment. This method includes the immersion test method and the immersion boiling water test method, which requires the use of a specific specification of the baseplate and ensures that the water used meets the standard requirements.
6. Artificial climate aging resistance
This is a method to simulate the aging process of films in the natural environment, and accelerate the aging of films by simulating natural climate factors. Compared with natural climate exposure, artificial climate aging tests can obtain film durability data more quickly and directly.
The inspection of coating performance is not only the evaluation of its Appearance and basic physical and chemical properties, but also a comprehensive evaluation of its stability and durability in a specific environment. With the continuous advancement of painting technology, the detection methods of film performance should also be continuously improved and updated to ensure the high quality and long life of painting products.
