In the paint manufacturing and application fields, the thermal stability of pigments is a crucial parameter. The stability of pigments under heat conditions is directly related to the final performance, lifespan and appearance of the paint. This article will discuss the thermal stability comparison methods of pigments in drying paints, equipment requirements and how to interpret and apply the test results.
The importance of thermal stability
Thermal stability mainly refers to the stability of a pigment under heat conditions or its heat resistance. Good thermal stability and sexual < unk > Celebration eness means that the paint can maintain its color and performance under high temperature conditions. This is an important performance indicator for paint manufacturers and users, especially when the paint needs to be used in a high temperature environment or is often affected by heat.
Instruments and materials
The following instruments and materials are required for thermal stability comparison:
Model: Lightweight metal plate or other suitable material, with a specification of 150mm x 100mm x (0.2~ 0.3) mm.
Oven: requires good ventilation and can be maintained at the specified temperature.
Drying-type paints should comply with the requirements of product standards.
Determination process
A. Preparation of specimens
First, the pigment specimen needs to be prepared using the method specified in the product standard and a dry-type paint. This involves appropriate dilution of the pigment to obtain the appropriate consistency.
B. Coating sample
The pigment sample is coated on the template to ensure that the thickness of the wet film is 75 to 120 μm. Also, use the same method to prepare a coated template for the standard.
C. Baking and cooling
The coated sample needs to be kept under the specified ambient conditions for a period of time, then baked in an oven and cooled to room temperature.
D. Comparison and comparison
The sample sample is compared with the standard sample under specified conditions to evaluate the thermal stability of the sample.
How to interpret the results
The results are mainly evaluated based on the degree of discoloration of the pigment after baking. Accurate chromatic aberration data can be obtained by visual comparison or by using a Colorimeter. If the degree of discoloration of the specimen is less than, equal to, or greater than that of the standard specimen, it means that its thermal stability is correspondingly higher, the same, or lower.
Standard Reference
In order to ensure the accuracy and reliability of the determination, this method is carried out according to the national standard GB 1711-89 "Comparison of Thermal Stability of Pigments in Drying Paints".
conclusion
The thermal stability of pigments plays a crucial role in the manufacture and application of coatings. A pigment with hot topic stability not only ensures the durability and durability of the paint, but also provides a more stable and consistent color for the paint. Therefore, accurate testing and comparison of the thermal stability of pigments is essential for paint manufacturers and users.
