Colorimeters in the Coatings Industry: Applications and Technical Exchange

The 2025 China International Paint Expo and the 23rd China International Paint Exhibition were held at the Shanghai New International Expo Center from the 3rd to the 5th of this month with the theme of "Quality Development and Technology Empowerment." The exhibition covers the fields of coatings and related industries, with participation from many coating and related industry companies, and also attracted attention from steel structure, automotive, and real estate industries that use coatings. The exhibition covers a range of products including testing equipment and analytical instruments. Colorimeters, as a type of testing equipment, are displayed and used at this exhibition, which helps promote the application and technical exchange of colorimeters in the paint industry.

Powder coating development was initially focused on metal corrosion protection. With the continuous advancement in powder coating production and application techniques, and the strengthening of environmental awareness and regulations in various countries around the world, the range of powder coating applications has expanded. The decorative and beautifying role of powder coating has also gained significant attention. Modern enterprises' assembly lines (such as refrigerator, air conditioner, instrumentation, metal doors and windows, aluminum profiles, mechanical and electrical equipment manufacturers) require high stability in both internal and external coating quality, making consistent coating color between batches an important requirement for customers.

Powder coating generally involves atomizing electrostatic powder paint into fine and uniform particles under compressed air, adhering evenly to metal surfaces through the action of a high-pressure electric field, and curing at high temperatures to form a film. The curing time and baking temperature are factors that affect the color difference of the finished product.

For example, a gas stove curing device has a moderate production cost and is suitable for individual enterprises' coating workpieces. However, during the baking process of the gas stove, nitrogen oxides are generated, causing the powder coating to severely yellow after curing, which brings many troubles to the manufacturer.

The Haopu Jia Colorimeter HPC-821N can monitor the impact of baking temperature and curing time on color difference.

By recording the data of color change through the instrument and its relationship with curing time and baking temperature, we can understand how curing time and baking temperature affect color difference, thereby solving the issue of color difference in finished products.

Each powder coating has its own curing characteristic curve, which can achieve complete curing within a certain temperature and time range. The Haopu Jia Colorimeter can record the color information and color difference values of finished products, making it convenient for everyone to monitor color difference issues in coatings.