In the Coating industry, quality control is one of the key factors to ensure product performance and stability. One of the important mass parameters is the non-volatile content, which reflects the proportion of non-volatile components in Coatings. This article will discuss in depth the concept of Non-volatile content, the determination method and its importance in Coating production.
The concept of non-volatile content
Non-volatile refers to the substance remaining after Coating evaporates under specific test conditions. There are usually two ways to determine Non-volatile content:
Weight method: This method involves heating the Coating at a certain temperature to evaporate the volatile material, then measuring the mass of the remaining material and comparing it to the total mass of the sample. Non-volatile content is the ratio of the mass of the remaining material to the mass of the sample.
Volume method: This method requires a certain volume of liquid Coating for Spreader film formation and curing under specified conditions. Subsequently, the volume of the resulting curing film is measured. The Non-volatile content is determined by calculating the volume of the Coating film formation substance.
It is important to note that the Non-volatile content is not an absolute value, but depends on the test conditions used, such as heating temperature and time. Due to solvent residues in volatile components, thermal analysis and low molecular weight components, the measurement results of non-volatile-matter content are relative rather than absolutely accurate.
Importance of Non-volatile content
In Coating production, Non-volatile content is a crucial quality control parameter. Its content directly affects the film mass formed and the use value of Coatings. The following are some aspects of the importance of non-volatile content:
1. Film mass
Non-volatile content affects the mass and performance of the film. If the Non-volatile content is too high, it may cause the film to become too hard, fragile, and even problems such as checking and cracking. Conversely, if the Non-volatile content is too low, the film may lack sufficient curing substances, resulting in insufficient film adhesion and decreased durability.
2. Coating viscosity control
In Coating production, viscosity is another key parameter. There is a close relationship between Non-volatile content and viscosity. When the viscosity needs to be kept within a certain range, the content of film formation substances in Coatings can be determined by Non-volatile determination. This helps manufacturers adjust formulations to ensure stability of viscosity and Coating performance.
3. Use value of Coatings
The use value of a Coating depends on its Non-volatile content. If the Non-volatile content does not meet the specified requirements, the Coating may not meet the requirements of a specific application. For example, in automotive paintings, accurate control of the Non-volatile content is essential to ensure that the Coating has an appropriate curing speed and film mass.
Determination method of Non-volatile content
Non-volatile content determination methods usually use weight method and volume method. These methods have their advantages and applicability in different situations.
1. Weight method
The weight method is one of the commonly used methods for determining Non-volatile content. It is relatively simple and involves heating the Coating at a certain temperature, evaporating the volatiles, and then weighing the mass of the remaining material. This method is suitable for most Coating types, especially those that do not easily form a curing film.
2. Capacity method
The volumetric method is commonly used for liquid Coating of Spreader film formation, which requires measurement of the volume of the film after curing. This method is suitable for situations where precise control of the content of Coating film formation substances is required, such as in some special coating processes.
Conclusion
Non-volatile content is a key quality control parameter in the Coating industry, which directly affects the use value of film mass and Coatings. Through different measurement methods such as weight method and volumetric method, Coating manufacturers can ensure product conformity and performance stability. Accurate determination of Non-volatile content in different Applications is a key step in ensuring that Coatings meet specific needs. Therefore, Non-volatile content control in Coating production should be regarded as an indispensable task to ensure product mass and customer satisfaction.
