The migration resistance of masterbatch is closely related to the characteristics of the pigments it contains. The pigment particles selected by high-quality masterbatch are small and the molecular structure is stable, which is not easy to diffuse in the plastic matrix. These pigments have a strong affinity with plastic molecules and can be firmly embedded in the molecular chain of plastics, reducing the possibility of migration to the surface due to molecular movement, and providing protection for migration resistance from the source.
The optimization of processing technology is crucial to improving the migration resistance of masterbatch. In the production process of masterbatch, through sufficient melt mixing, the pigments will be evenly dispersed and wrapped in the carrier resin to form a stable particle structure. This tight wrapping state can prevent the pigment particles from detaching from the carrier during the subsequent processing and use of plastic products, reduce the chance of migration to the surface of the product or the contact object, and keep the pigment stably present in the plastic.
In the use environment of plastic products, temperature changes have a greater impact on the migration resistance of masterbatch. High-quality masterbatch can remain stable within a certain temperature range. Even at higher temperatures, the carrier resin will not lose its bondage to the pigment due to softening. In contrast, in a high-temperature environment, the pigment of inferior masterbatch is easy to migrate due to the softening of the carrier resin, resulting in color change on the surface of the product or contamination of the contact object, while masterbatch with good migration resistance can effectively resist this temperature influence.
When in contact with other materials, masterbatch with good migration resistance shows good stability. For example, when packaging materials made of plastic containing masterbatch come into contact with food or cosmetics, the pigment will not migrate to the packaged items due to contact; when in long-term contact with other materials such as plastics or metals, color transfer will not occur, ensuring the cleanliness of the product itself and the contact object. This feature is particularly important in the fields of food packaging and medical supplies.
The additives added to masterbatch will also enhance its migration resistance. Some additives can improve the compatibility of pigments and carrier resins, making the two more closely combined and reducing the possibility of pigments being free; some additives can form a protective film on the surface of pigment particles to prevent them from migrating to the outside world. The rational use of these additives further consolidates the migration resistance of masterbatch and allows the pigment to remain stable throughout the life cycle of plastic products.
During long-term use, masterbatch with good migration resistance can maintain the consistency of product appearance. Even after long-term storage or use, there will be no "frosting" or "precipitation" on the surface of the product, and the color is always uniform and stable. However, masterbatch with poor migration resistance may cause color blocks and spots on the surface of the product or pollute the surrounding environment after a period of use, affecting the beauty and safety of the product.
High-quality masterbatch has good migration resistance and will not migrate to the surface of the product or contact objects under normal use conditions. The stable characteristics of the pigment, advanced processing technology, reasonable addition of additives, and good adaptability to environmental factors such as temperature together give masterbatch excellent migration resistance. This not only ensures the appearance quality of plastic products, but also avoids the potential safety hazards caused by pigment migration, so that it can be safely and reliably used in many fields.
