What are the requirements for plastic masterbatche？

Plastic masterbatch is a plastic colorant that is well dispersed with a high proportion of pigments or additives and thermoplastic resin. The selected resin has a good wetting and dispersing effect on the colorant, and has good properties with the material to be colored. compatibility. Namely: pigment + carrier + additive = masterbatch.

The classification methods of color masterbatches are commonly used as follows:

Classified by carrier: such as PE masterbatch, PP masterbatch, ABS masterbatch, PVC masterbatch, EVA masterbatch, etc.

Classified by purpose: such as injection masterbatch, blow molding masterbatch, spinning masterbatch, etc. Each species can be divided into different grades.

The pigments used in plastic masterbatches have different performance requirements for the pigments due to different processing techniques and plastic products. Generally speaking, plastic masterbatche have the following performance requirements:

1. Coloring power

The coloring power of a pigment refers to the amount of pigment required for a certain color product, expressed as a percentage of the coloring power of a standard sample. The coloring power of a pigment is not only related to its properties

It is also related 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 a pigment under processing and use temperatures. When considering the heat resistance of the pigment, the heating time must also be considered.

Because plastics are processed into products, the processing methods are different, and the heating time is different. During use, the purpose is different, and the heating time is also different.

The higher the degree, the shorter the heat resistance time.

3. Migration resistance

The migration resistance of the pigment means that the colored plastic may be in contact with other solid, liquid, gas and other substances for a long time or work in a certain environment.

Biological and chemical effects, manifested as the migration of pigments from the inside of the plastic to the free surface of the product, or to the 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. The color of certain pigments will change to varying degrees under the irradiation of light.

Weather resistance refers to the color stability of a pigment under natural conditions. Because black masterbatch is used very much outdoors, it pays special attention to migration and weather resistance.

5. Chemical resistance

Industrial plastic products are often used to store chemicals and to transport acids and alkalis. Therefore, the acid and alkali resistance of the pigment should be considered.

The chemical resistance to acids and alkalis 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 coloring plastic products, two or more pigments are often used to match colors. Therefore, it is necessary to understand the mixing performance between them. At the same time, it is also necessary to understand whether the color masterbatch reacts chemically with the additives and auxiliaries in the plastic.