The pigments used in the color masterbatch must pay attention to the matching relationship between the pigments, plastic raw materials and additives. The selection points are as follows:
(1) Pigments cannot react with resins and various additives, and have strong solvent resistance, low migration, and good heat resistance. That is to say, 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 temperature of plastic products, the pigment should not decompose and discolor at the molding heating temperature. Generally, inorganic pigments have better heat resistance, while organic pigments and dyes have poor heat resistance, which should be paid enough attention when selecting pigment varieties.
(2) The dispersibility and tinting strength of the pigment are better. The uneven dispersion of the pigment will affect the appearance of the product; the poor tinting strength of the pigment will lead to an increase in the amount of pigment and the increase in material cost. The dispersibility and tinting strength of the same pigment in different resins are not the same, so this should be paid attention to when selecting pigments. The dispersibility of the pigment is also related to the particle size. The smaller the particle size of the pigment, the better the dispersibility and the stronger the tinting strength.
(3) Understand other properties of pigments. For example, for plastic products used in food and children’s toys, the pigments are required to be non-toxic; for plastic products used in electrical appliances, pigments with good electrical insulation should be selected; for outdoor use For plastic products, pigments with good weathering resistance should be selected.
References
[1] Zhong Shuheng. Color Composition. Beijing: China Art Publishing House, 1994.
[2] Song Zhuoyi et al. Plastic raw materials and additives. Beijing: Science and Technology Literature Publishing House, 2006.
[3] Wu Lifeng et al. Masterbatch User Manual. Beijing: Chemical Industry Press, 2011.
[4] Yu Wenjie et al. Plastic Additives and Formulation Design Technology. 3rd Edition. Beijing: Chemical Industry Press, 2010.
[5] Wu Lifeng. Plastic Coloring Formulation Design. 2nd Edition. Beijing: Chemical Industry Press, 2009
Post time: Jun-18-2022
