A detailed analysis of the basic properties and applications of pigment Yellow 151

151 yellow, also known as H4G yellow, holds a significant position in the world of pigments. Its international index number is Pigment Yellow 151, and it is an extremely important organic pigment. Next, a comprehensive and detailed introduction to it will be provided:

I. Basic Information

Its English name is Pigment Yellow 151, and this name is widely used in the field of international pigment communication and research. The CAS number is 31837-42-0. Just as every unique individual has a distinctive identity mark, this CAS number accurately defines 151 Yellow. Its molecular formula is C18H15N5O5. This complex molecular formula is like a mysterious key, revealing the arrangement and combination of atoms within the 151 yellow molecule. The molecular weight is 381.3422, which precisely reflects the relative mass of the 151 yellow molecule. In the Chinese context, it also has many alternative names, such as C.I. Pigment Yellow 151, benzimidazolone Yellow H4G, Permanent Yellow H4G, etc. These alternative names are just like its nicknames in different regions or application scenarios, making it convenient for people to identify and remember.

Ii. Physical Properties

In terms of appearance, 151 Yellow presents a yellow powder form. This yellow powder, like the golden sunlight in nature, is finely crushed into tiny particles and evenly scattered in every corner. Its melting point is 330, which is a key physical property, like a critical point. When the temperature reaches this value, 151 yellow will undergo a state change. Its density is approximately 1.5g/cm³. However, due to the influence of various factors during the preparation process, such as different proportions of reaction raw materials, reaction temperature and pressure, as well as differences in testing conditions, there are also data showing 1.55 ± 0.1g/cm³ or 1.57g/cm³. Its oil absorption capacity is approximately 52g/100g. This value is very important in certain application scenarios that require oil mixing, such as when preparing some special coatings or inks. The size of the oil absorption capacity will affect the texture and performance of the final product. The bulk density is 12.5lb/gal (approximately 1.98g/cm³. Extra caution must be exercised when converting units, as a slight mistake may lead to incorrect use of the data). This value reflects the density of 151 yellow in the bulk state. Its particle shape is flaky, just like tiny yellow scales. The existence form of these flaky particles will affect its dispersibility and coverage in various materials. The specific surface area may range from 18 to 23m²/g depending on the data from different sources. The size of the specific surface area determines the contact area between 151 yellow and its surrounding environment, thereby affecting the rate of some of its chemical and physical reactions. For instance, when adsorbing other substances or conducting chemical reactions with them, the larger the specific surface area, the easier the reaction may proceed. Regarding the pH value (10% slurry), although it is not explicitly stated, we know that the pH value of general pigment slurries is adjusted according to the specific formula and application requirements, as different pH value environments may affect the stability of 151 Yellow and its compatibility with other components.

Iii. Chemical Properties and Stability

The lightfastness of 151 Yellow is excellent, generally reaching grade 7 to 8. However, the series here is not absolutely fixed, as differences in testing methods and conditions may lead to variations in the results. Just like under different light intensities, light exposure durations and the precision of the testing equipment, the obtained lightfastness results will fluctuate. Its heat resistance usually reaches 200-250 degrees Celsius. In HDPE (high-density polyethylene), its heat stability can even reach 260/5 minutes. This characteristic makes it perform well in some environments that require high-temperature processing or use. For instance, in the production process of plastic products, high-temperature processing is often required. 151 Yellow can maintain color stability in such a high-temperature environment and will not change color or decompose due to excessive temperature. In terms of weather resistance stability, after being exposed to the Florida sun for one year, the weather fastness of the alkyd melamine resin colored samples can reach grade 5 gray scale. The climate conditions in Florida are complex and changeable, with intense sunlight, high humidity and various complex climatic factors. 151 Yellow can still achieve a weather fastness of grade 5 gray card after one year of exposure to such an environment, which is sufficient to prove its excellent performance in dealing with harsh weather conditions. Its water resistance is grade 5 (according to certain test standards), which means that when in contact with water or a humid environment, it can maintain its color and performance well and will not fade or undergo chemical changes due to water erosion. The oil resistance is also grade 5 (according to certain test standards). When in contact with oily substances, such as in some industrial coatings or plastic products that need to resist oil contamination, 151 Yellow can remain stable. The alkali resistance is also at level 5 (according to certain test standards). In an alkaline environment, it can resist the erosion of alkali and maintain its own chemical structure and color characteristics.

Iv. Main Uses

In the field of industrial coatings, Pigment Yellow 151 is simply a brilliant star. Industrial environments are often rather complex, and coatings need to be exposed to various conditions for long periods of time, such as high temperatures, light, and erosion by chemical substances. 151 Yellow is highly suitable for use in industrial coatings. With its excellent heat resistance and light resistance, it can ensure the durability and color stability of the coating. Whether in the protective coatings of large industrial plants and Bridges or in the shell coatings of various industrial equipment, 151 Yellow can keep the coatings in bright colors under high temperature and light conditions, just like a loyal guardian, safeguarding the color and performance of the coatings.

In terms of automotive primers, 151 Yellow has become an ideal choice for car primers due to its high heat resistance and stability. During the operation of a car, the engine compartment and the body will generate high temperatures under the sunlight, and the car primer also needs to withstand the influence of various factors such as friction and vibration from the road surface. 151 Yellow can maintain its color durability in such high-temperature environments, enabling the car primer not only to protect the vehicle body but also to retain an attractive color, adding luster to the overall appearance of the car.

In the field of plastic coloring, 151 yellow is widely used due to its heat resistance stability. During the processing of plastics, they often need to go through procedures such as high-temperature melting and molding. However, 151 Yellow can maintain its color unchanged during this high-temperature processing. Whether it is many common plastics such as PS (polystyrene), ABS (acrylonitrile-butadiene-styrene copolymer), PVC (polyvinyl chloride), PC (polycarbonate), PBT (polybutylene terephthalate), etc., 151 Yellow can provide them with stable and bright colors, meeting the color requirements of different plastic products. From daily-use plastic products to high-end engineering plastic products, 151 Yellow can be found everywhere.

In terms of ink, 151 yellow can be used in ink to provide bright and long-lasting colors for printed materials. The quality of printed matter and the durability of color largely depend on the performance of pigments in the ink. 151 Yellow is particularly suitable for coloring polyester laminated plastic film printing inks. In this printing scenario, it can make the colors of the printed matter more vivid and eye-catching, and will not fade during long-term storage, ensuring the quality and aesthetic appeal of the printed matter.

In addition to the above main applications, 151 yellow can also be used for rubber coloring and the sizing of synthetic fibers. In rubber products, it can offer a rich variety of color options for rubber, from colored rubber tires to various colored rubber products, 151 Yellow can exert its color magic. During the coloring process of the original pulp of synthetic fibers, 151 Yellow can be evenly dispersed in the original pulp, endowing synthetic fibers with rich colors, making synthetic fiber products more diverse in color and meeting the color demands of different consumers.