The heat resistance of the pigment means that under a certain processing temperature, the pigment does not have obvious changes in shade and tinting strength, For various types of resins, the processing temperature generally ranges from 150°C for polyvinyl chloride resins to 300°C for polycarbonate resins.

    However, even with the same resin (such as LDPE), depending on its equipment, process conditions, and product requirements, the processing temperature can range from 180°C in the blown film process to 280°C in the cast film process. It is worth noting that when considering the high temperature resistance of the pigment, it is also necessary to consider its heating time. For example, when nylon 6 and polyester are polymerized, the (heating) time is 4h.

  Another thing to consider is the thermal stability of the resin to be colored. When the resin is heated, it will change color due to thermal degradation, such as yellowing. 

  Analysis method can be used to evaluate the thermal stability of pigments, wherein thermal gravimetric analysis (TG) is to measure the weight change of the pigment when heated at a certain heating rate, and the temperature and weight curve is used to represent the weight loss of the sample at different temperatures. rate, the thermal stability of the pigment can be measured.

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