Les pigments de couleur sont des matières particulaires insolubles utilisées pour colorer les plastiques. Ils se distinguent des colorants par leur insolubilité dans la résine, ce qui améliore la stabilité de la teinte et réduit les phénomènes de migration. Les principales classes sont les pigments inorganiques, organiques, le noir de carbone et les pigments à effets. Le choix d’un pigment dépend de la stabilité thermique, de la solidité à la lumière, de la compatibilité avec le polymère et des exigences réglementaires. Dans les plastiques, les pigments sont souvent introduits sous forme de masterbatch pour améliorer la dispersion et la précision du dosage. Les défis actuels incluent la recyclabilité, la réduction des substances dangereuses et le développement de pigments haute performance plus durables.
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