Plastic masterbatch consists of a high proportion of pigments or additives and thermoplastic resin, a well-dispersed plastic colorant. The selected resin has good wetting and dispersion of the colorant and has a good phase with the material Capacitive. That is: pigment + carrier + additive = masterbatch.
The classification methods of color masterbatch are commonly used in the following types:
Classification by carrier: such as PE masterbatch, PP masterbatch, ABS masterbatch, PVC masterbatch, EVA masterbatch, etc.
Classified by use: such as injection masterbatch, blow molding masterbatch, spinning masterbatch, etc. Each variety can be divided into different grades.
Pigments used in plastic masterbatches have different performance requirements for pigments due to different processing techniques and the way plastic products are made. Generally speaking, the following performance requirements are required:
1. Coloring power
The coloring power of the pigment refers to the amount of pigment required for a certain color product, expressed as a percentage of the coloring power of the standard sample. The coloring power of the pigment is not only related to its properties, but also to the degree of pigment dispersion. The degree of dispersion mainly refers to the degree of refinement of the pigment. The greater the degree of dispersion, the stronger the coloring power, but there is a saturation value.
2. Heat resistance
Heat resistance refers to the degree of change in the color or performance of the pigment during processing and use temperature. When considering the heat resistance of the pigment, the heating time should also be considered. When plastics are processed into products, the processing methods are different and the heating time is different. In the process of use, the purpose is different, and the heating time is also different. Generally, the higher the temperature, the shorter the heat resistance time.
3. Migration resistance
Pigment migration resistance refers to the long-term contact of colored plastics with other solid, liquid, gas and other substances or working in a specific environment may have physical and chemical effects with the above substances, which is manifested as the migration of pigments from the plastic to the product Free surface, or migrate to adjacent plastic or solvent.
4. Light resistance and weather resistance
Plastic products are required to have good light resistance and weather resistance for long-term outdoor use. Under the illumination of some pigments, the color will change to varying degrees. Weather resistance refers to the color stability of pigments under natural conditions. Because black mothers are used very much outdoors, they pay special attention to migration resistance and weather resistance.
5. Chemical resistance
Industrial plastic products are often used to store chemicals and used to transport acids, alkalis, etc. Therefore, the acid and alkali resistance properties of pigments should be considered.
The chemical resistance to acids, alkalis, etc. should also include resin decomposition products, other additives in products, and detergents, bleaches and other substances in the use environment.
6. Toxicity
More and more plastic products are used in daily life, so more and more attention is paid to the toxicity of colored plastics.
7. Mixed
When plastic products are colored, more than two kinds of pigments are often used for color matching, so it is necessary to understand the mixing performance between them. At the same time, it is also necessary to understand whether the plastic masterbatch reacts with additives and additives in plastic.