Os revestimentos desempenham um papel importante na indústria e na construção para proteger, embelezar e melhorar o desempenho dos materiais. In order to ensure the quality of the coating, a series of performance tests must be carried out in order to obtain excellent results in practical applications. This article will delve into all aspects of coating performance testing, incluindo adesão, flexibilidade, impact strength, dureza, lustro, resistência ao calor, aging resistance, resistência ao desgaste, and other performance indicators.

1. Adesão

Adhesion refers to the degree of firm bond between the coating and the surface of the coated object. This binding force depends on the interaction between the polymer groups in the coating, such as hydroxyl or carboxylic groups, and the polar groups on the surface of the coated material. Adhesion can be affected by a variety of factors, including pollution, umidade, shrinkage stress of the coating, and crosslinking degree. The measurement methods of coating adhesion include grid method, circle method, drawing method and solvent test. These methods help to ensure that the coating adheres tightly to the surface of the coating without peeling or stripping.

2. Flexibilidade

Flexibility refers to the ability of the coating to remain intact without cracking or peeling when subjected to bending or deformation. The flexibility of the coating is usually affected by the flexibility and crosslinking density of the film-forming material. The method for determining the flexibility of the coating consists of bending the painted sample over the different diameters of the rod using a rod tester to determine the minimum diameter, which is an indicator of the flexibility of the coating.

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3. Força de impacto

Impact strength assesses the resistance of the coating to high velocity impact, especially for metallic materials. The coating with good impact strength is not easy to crack or peel under impact conditions. The method of determining the impact strength includes the use of an impact tester to evaluate the performance of the coating by dropping a weight of a certain mass. The impact strength is usually expressed as “kg·cm”.

4. Dureza

Hardness is the resistance of the coating surface to the object, and is one of the mechanical strength of the coating. The hardness of the coating is usually affected by the properties of the film-forming material and the degree of crosslinking. Different hardness determination methods include pendulum damping hardness method, pencil hardness method, scratch hardness method and indentation hardness method. These methods can be used to measure the hardness of a coating, helping to assess its quality and durability.

5. Brilho

Gloss is the property of the coating surface’s ability to reflect light. Gloss is usually expressed numerically, reflecting the degree of specular surface of the coating. Gloss determination is usually performed using a gloss meter, which is one of the key indicators to evaluate the appearance quality of the coating.

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6, heat resistance and aging resistance

Heat resistance evaluates the ability of the coating to maintain its properties under high temperature conditions. Aging resistance evaluates the performance of the coating under the influence of environmental factors such as light, heat and oxidation. These performance indicators are critical to the coating in a specific application environment and are therefore often regarded as an important indicator of the quality of the coating.

7. Resistência ao desgaste

Wear resistance refers to the resistance of the coating to friction and wear. The commonly used wear resistance measurement methods include the use of a coating wear tester to test the wear of the coating under a certain load. Smaller weight loss values mean better wear resistance, which is important for applications that require frequent wear, such as road marking paint and floor paint.

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8. Other performance

In addition to the above performance metrics, there are some other performance parameters to consider. Light retention assesses the coating’s ability to maintain shine under light conditions, while water resistance tests the coating’s resistance to water. Performance parameters such as solvent resistance and temperature resistance may also be critical for a coating for a specific application.

In the testing of coating properties, appropriate testing methods and standards are the key to ensure coating quality. By taking these performance parameters into account, coating manufacturers and users can choose a coating that suits their needs and ensures excellent performance and reliability in real-world applications. Through rigorous performance testing, it is possible to ensure that the coating will perform well in a variety of environmental conditions, providing lasting protection and aesthetic results.