In our lives, colorful plastic products not only have a strong practicality, but also give people a visual enjoyment. In order to make the plastic products rich in color, colorants are used in the production of plastic products. The colorant is mainly divided into two types of pigments and dyes. Dyes are organic compounds that are soluble in water and most solvents and dyed plastics. It can color the inside and outside of the dyed object. The advantages are small density, high tinting strength and good transparency, but its general molecular structure is small, and migration occurs easily during coloring.
Colorants of plastic products can be divided into seven categories according to color: red, yellow, blue, green, purple, black and white.
Red coloring agent: Lisuobaohong - more dosage, bright color, good tinting strength and solvent resistance, but not resistant to sunlight; reddish - more use, heat, but poor transparency; Molybdenum chrome red, iron oxide red and phthalocyanine red - used for color matching, less used alone.
Yellow coloring agent: lemon yellow, medium chrome yellow and deep chrome yellow - yellow opaque, chromic acid-based pigment, can be used alone or color matching; fluorescent yellow - green pigment with yellow color, bright color, can be used alone Or color matching.
Blue coloring agent: Phthalocyanine Blue B, Phthalocyanine Blue BS - has good heat resistance, light resistance and solvent resistance, good dispersibility, can be used as blue transparent plastic products, can also be notified to color matching; Ultramarine - sulfur-containing sodium aluminosilicate, high temperature and light resistant, but not acid resistant, commonly used in the production of PET bottles and caps;
Green coloring agent: The phthalocyanine green is applied in a large amount, and can be used as a transparent plastic product alone or in color, has good heat resistance and solvent resistance, and has good dispersibility.
Purple coloring agent: Permanent purple RL - a purple pigment with a small mobility and a blue light, good heat and light resistance.
Black coloring agent: carbon black - cheap, large amount, low mobility, heat resistance. There are UV protection and conductive effects on plastic products. Different production processes can obtain a variety of different carbon blacks with a wide range of particle sizes, and the properties are also very different. Carbon black is divided into pigment carbon black and rubber reinforcing carbon black according to the use. The pigment carbon black is further classified into high pigment carbon black, medium pigment carbon black and low pigment carbon black according to its coloring ability. The carbon black particles are prone to aggregation, and the coloring power of the carbon black is increased to solve the dispersibility of the carbon black.
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