Most of the thermoplastic plastic materials are transparent or milky white, and precision plastic parts often make various requirements on the color, optical components need to be black to prevent light leakage and eliminate stray light, appearance parts often use different colors according to design needs. Therefore, before the processing of plastic products, dyeing is required, that is, the plastics are mixed with different amounts of dyes. The thermoplastic dyeing methods are as follows:
(1) Dry Dyeing Method A certain proportion of dyes and plastic granules are loaded into a rotating drum, and 0.01% to 0.1% of zinc stearate or white mineral oil is added as a wetting agent to make the plastic easy to adhere to the dye and turn. The roller completely mixes the plastic with the dye.
(2) Extrusion Dyeing This method consists of mixing dyes and plastics by dry dyeing, then squeezing them in a thin strip with a special extruder, and cutting them into granules. The color mixing of the method is good and helps to disperse poorly. Paints.
(3) Dry thick dyeing method This method is basically the same as the extrusion dyeing method. The difference is that the proportion of dyes in plastics is 10 times higher than usual. When plastic injection can be added to many times the primary color plastic to dilute. use.
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