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The thermal stability of pigments refers to their ability to withstand high temperatures without undergoing significant changes in their chemical structure or physical properties. This characteristic is crucial for pigments used in various applications, such as coatings, plastics, and inks, where exposure to heat can occur during processing or end-use. A pigment with good thermal stability will maintain its color, consistency, and performance even when subjected to elevated temperatures, ensuring durability and longevity in the final product.
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2025.02.08
Summary
The heat resistance of pigments refers to the ability of pigments to resist significant changes in color and coloring power at a certain processing temperature, which indicates the resistance of pigments to changes in coloring power caused by processing temperature.
For various types of resins, the processing temperature generally ranges from 150°C for polyvinyl chloride resin to 300°C for polycarbonate resin.
However, even for the same resin (such as LDPE), the processing temperature can vary from 180°C for the blow molding process to 280°C for the cast film process, depending on the equipment, process conditions, and product requirements. It is worth noting that while considering the high-temperature resistance of pigments, the heating time must also be taken into account. For example, during the polymerization of nylon 6 and polyester, the heating time is 4 hours. Another factor to consider is the thermal stability of the resin being colored, as the resin may undergo discoloration, such as yellowing, due to thermal degradation when heated.
The evaluation of pigment thermal stability can be conducted using thermal analysis methods, among which thermogravimetric analysis (TG) measures the weight change of pigments when heated at a certain heating rate. The weight loss rate of the sample at different temperatures can be represented by a temperature-weight curve, allowing for the measurement of the thermal stability of the pigment.
Yuhong Pigments is an organic pigment manufacturer that integrates research and development, production, and sales. The organic pigments produced are easy to disperse, vibrant in color, and have excellent temperature and chemical resistance. Yuhong Pigments is customer-centric, continuously improving and innovating, and dedicated to serving every customer with care and responsibility.
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Yuhong Pigment Co.,LTD. It is a professional company that produces "Ninghong" and "Kaihong" brand series of organic pigments. It focuses on "easy dispersion" of pigments and is committed to the cause of pigments. Products are widely used in ink, plastic, rubber, paint, paint, paper, culture and education, printing, printing paste and other industries.
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