The determination of moisture and heat resistance of coating films is a method to evaluate the stability of coatings in humid or high temperature environments. It is mainly used to test the durability and weather resistance of coatings in humid or high temperature environments.
The determination of the moisture and heat resistance of the coating film is usually tested using a damp heat chamber, which can place the coating sample in a constant high temperature and humid environment, usually 60 ℃ and a relative humidity of 100%. During a certain period of time, the changes in properties such as appearance, color, adhesion and hardness of the coating sample are detected to evaluate the moisture and heat resistance of the coating.
Coating film moisture and heat resistance measurement can be used to evaluate the durability and stability of various types of coatings, such as automotive paints, architectural coatings, electronic products, etc. By measuring the performance changes of coatings in humid and hot environments, the durability and life of coatings can be predicted, providing basic data for formulating coating maintenance and improvement programs.
The moisture and heat resistance of the coating film refers to whether the coating film can maintain its original performance and appearance in a high temperature and high humidity environment. The following are the steps for measuring the moisture and heat resistance of the coating film:
Preparation of samples: According to the type and requirements of the coating film to be measured, brush the required coating film on the test plate, and cut it into a sample that meets the standard size after drying.
Constant temperature and Humidity Chamber: Place the sample in a constant temperature and Humidity Chamber and store it for a certain period of time under the condition of 80 ℃ ± 2 ℃ and relative humidity of 95%, generally 7 days.
Test performance: Take out the sample and perform corresponding performance tests, such as observing the appearance of the coating film, measuring the thickness of the coating film, and measuring the hardness, viscosity, tensile strength, adhesion and other indicators of the coating film.
Comparative analysis: The performance test results of the sample in the normal temperature and humidity environment are compared with the test results under constant temperature and humidity conditions, and the moisture and heat resistance of the coating film under high temperature and high humidity conditions is evaluated.
NBCHAO reminds you that the determination of moisture and heat resistance of the coating film should be combined with the actual application situation, taking into account the environmental conditions, service life and use requirements of the coating film.
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