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Requirements for pigments used in masterbatch
(1) The pigment cannot react with resin and various additives, and has strong solvent resistance, low migration and good heat resistance. In other words, the masterbatch cannot participate in various chemical reactions. For example, carbon black can control the curing reaction of polyester plastic, so carbon black material cannot be added to polyester.
Due to the high molding processing temperature of plastic products, the pigment should not decompose and change color under the conditions of molding heating temperature. Generally, inorganic pigments have better heat resistance, while organic pigments and dyes have poor heat resistance. This point should be paid attention to when choosing pigments.
(2) The dispersion and tinting strength of the pigment should be good. When the pigment is unevenly dispersed, it will affect the appearance of the product; when the coloring power of the pigment is poor, the amount of the pigment will increase and the material cost will increase. The same colorant has different dispersibility and tinting power in different resins, so you should pay attention to this when choosing a colorant.
The particle size of the pigment is also related to the dispersibility. The smaller the particle size of the pigment, the better the dispersibility and the stronger the coloring power.
(3) Other properties of the colorants should be understood. For example, for plastic products used in food and children's toys, the color materials should be non-toxic; for plastic products used in electrical appliances, color materials with good electrical insulation should be selected; For outdoor plastic products, color materials with good weathering resistance should be selected.