Coatings play an important role in a variety of applications, whether in construction, automotive manufacturing or industrial processing. In order to ensure the quality and performance of the coating, the performance testing of the coating product is an indispensable step. This article will discuss in detail all aspects of coating product performance testing, including appearance and transparency, color, paint density, nonvolatile matter, paint viscosity, paint fineness, and paint storage stability.

1. Paint appearance and transparency

The appearance and transparency of the paint is one of the basic signs of the quality of the paint. Appearance determination involves placing a sample in a colorimetric tube at a specific temperature to see if it contains mechanical impurities. The transparency measurement is to evaluate the transparency grade by comparing the performance of the sample under the transmitted light with the turbidity degree of the standard liquid. These test methods help to determine whether the coating meets the quality standards, especially for products such as varnishes, oils and paints.

Step 2: Color

Color is another key factor in the performance of paint products. The color of the paint not only affects aesthetics, but also plays a role in identification and decoration in some applications. The standard specifies the method of determining the color of varnish, oil and diluent, usually using an iron drill colorimeter or color card for visual comparison. In some cases, in order to reduce subjective errors, it is also possible to use an instrument such as an photoelectric colorimeter for quantitative determination.

Coating product performance testing: appearance color non-volatile substance viscosity fineness and storage stability

3. No volatiles

Non-volatile matter is the active component in the paint, and its content reflects the quality of the paint. The higher the content of non-volatile matter, the more active ingredients in the paint, which is an important quality control parameter in the paint production. The method for determining non-volatile matter involves heating the sample under specific conditions and then calculating the non-volatile matter content by the change in mass of the sample before and after weighing it. However, this method cannot accurately measure non-volatile substances such as trace amounts of water vapor, which may lead to a bias in the results.

4. Paint viscosity

The viscosity of coating is one of its physical and chemical properties, reflecting the size of molecular weight, which directly affects the performance of coating. Too high viscosity will make the paint difficult to use, and too low viscosity will easily lead to problems such as flow hanging. The measurement method of viscosity is usually detailed in the specification to ensure consistency and accuracy.

5. Paint fineness

Coating fineness detection is mainly used to check the size of pigments, fillers and other particles or the uniformity of dispersion, usually expressed in microns. Fineness directly affects the gloss, water permeability and storage stability of the coating. By measuring the size and distribution of particles, the performance characteristics of coatings can be better

Coating product performance testing: appearance color non-volatile substance viscosity fineness and storage stability

6. Paint storage stability

The storage stability test of coatings is a key step to evaluate the performance changes of coatings during storage. Tests include measuring changes in viscosity, pigment settling, ease of remixing, and changes in other performance parameters. These tests can be carried out under different environmental conditions to simulate what the paint is likely to encounter in real-world use. Stability testing helps to ensure that the coating maintains its performance uncompromised during storage and transportation.

In summary, coating product performance testing is a key step to ensure the quality and performance of coatings. The determination methods of various coating performance parameters are specified in detail in the national standards to ensure the accuracy and comparability of the results. Through rigorous performance testing, coatings can be guaranteed to perform well in a variety of applications and meet customer needs and standards. Therefore, professionals in the field of coating production and use must fully understand and comply with these performance testing standards to ensure the quality and reliability of coatings.