{"id":12090,"date":"2026-04-13T05:52:20","date_gmt":"2026-04-13T05:52:20","guid":{"rendered":"https:\/\/ideal-pro.com\/?p=12090"},"modified":"2026-04-13T06:14:47","modified_gmt":"2026-04-13T06:14:47","slug":"performance-requirements-for-colorants-in-nylon-injection-molding-parts","status":"publish","type":"post","link":"https:\/\/ideal-pro.com\/fr\/performance-requirements-for-colorants-in-nylon-injection-molding-parts\/","title":{"rendered":"Performance Requirements for Colorants in Nylon Injection Molding Parts"},"content":{"rendered":"

Introduction<\/h4>\n

Selecting the right colorant for engineering plastics is a complex process. While many organic pigments, inorganic pigments, and solvent dyes work well for general thermoplastics, high-performance materials like Nylon (Polyamide) have strict requirements.<\/p>\n

Below, we explore the five critical performance characteristics colorants must possess for successful Nylon injection molding<\/a>1<\/a><\/sup>.<\/p>\n

1. Heat Resistance and Lightfastness<\/h4>\n

The processing temperature of the resin dictates the stability requirements for the colorant. As shown in the table below, Polyamide (Nylon) requires some of the highest processing temperatures among engineering plastics<\/a>2<\/a><\/sup>.<\/p>\n

Processing Temperatures and Colorant Requirements by Resin Type<\/strong><\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Resin Type<\/th>\nProcessing Temp (℃)<\/th>\nKey Colorant Requirements<\/th>\n<\/tr>\n<\/thead>\n
Polyamide (Nylon)<\/strong><\/td>\n270 - 290<\/strong><\/td>\nHeat resistance, Water-free, Good dispersion<\/strong><\/td>\n<\/tr>\n
Polyester<\/td>\n270 - 290<\/td>\nHeat resistance, Non-migrating, Neutral pH<\/td>\n<\/tr>\n
ABS<\/td>\n230 - 310<\/td>\nHeat resistance, Good dispersion<\/td>\n<\/tr>\n
Polypropylene<\/td>\n230 - 280<\/td>\nHeat resistance, Good dispersion<\/td>\n<\/tr>\n
Polyurethane<\/td>\n210 - 270<\/td>\nLightfastness, Acid\/Reduction resistance<\/td>\n<\/tr>\n
PMMA<\/td>\n200 - 230<\/td>\nFastness, Heat resistance, Non-migrating<\/td>\n<\/tr>\n
PVC<\/td>\n180 - 250<\/td>\nGood dispersion, Acid resistance<\/td>\n<\/tr>\n
Polystyrene<\/td>\n180 - 240<\/td>\nFastness, Good solubility<\/td>\n<\/tr>\n
Polycarbonate<\/td>\n150 - 200<\/td>\nHeat resistance, Water-free, Good dispersion<\/td>\n<\/tr>\n
PEHD<\/td>\n160 - 230<\/td>\nHigh thermal stability, Non-migrating<\/td>\n<\/tr>\n
LDPE<\/td>\n150 - 220<\/td>\nExcellent fastness, Non-migrating<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\n

Note :<\/strong> Due to the high processing temperatures of Polyamide, colorants must exhibit exceptional thermal stability. Many organic pigments can negatively affect the properties of the Nylon melt, limiting the selection to specific high-performance pigments with good lightfastness.<\/p>\n<\/blockquote>\n

\"Molten<\/p>\n

2. Chemical Stability<\/h4>\n

There must be no chemical reaction between the colorant and the resin, nor should the colorant promote resin decomposition.<\/p>\n

Polyamide resins (PA) are highly active. In their molten state, they exhibit reducing properties<\/strong>, which can easily cause colorants to shift in hue or degrade. Therefore, the choice of colorants for Nylon is limited to those with high chemical inertness.<\/p>\n

3. Migration Resistance<\/h4>\n

Migration refers to the movement of the colorant within the polymer or to the surface. There are three main types:<\/p>\n