Jiangyin jinmansheng Plastic Technology Co., Ltd
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  • Introduction to the process of plastic color matching

    Plastic color matching and coloring can adopt the method of adding toner directly to the resin and the method of masterbatch. After the toner is directly mixed with the plastic resin, it is sent to the next step of the product forming process, which has a short process and low cost, but it has a poor working environment, poor coloring power, poor color uniformity and quality stability.

    The color masterbatch method is to formulate colorant, carrier resin, dispersant, and other auxiliary agents into pellets with a certain concentration of colorant. When the product is formed, a certain amount of color masterbatch is added according to the coloring requirements, so that the product contains the required amount of colorant. Coloring requirements.

    Color masterbatch can be classified according to the resin to be colored, such as ABS masterbatch, PC masterbatch, PP masterbatch, etc.; it can also be classified according to the coloring resin addition process, including injection molding, blown film, and extrusion masterbatches. . The color masterbatch has high tinting strength due to the pretreatment of the pigment first, the dosage can be reduced, the quality is stable, the transportation, storage, and use are convenient, and the environmental pollution is greatly reduced.

    The dispersant for plastic color matching removes the surface air by wetting and penetrating the pigment, dispersing the agglomerates and agglomerates into fine, stable and uniform particles, and no longer agglomerates during the processing. The commonly used dispersant is low molecular weight polymer For ethylene wax, EVA wax or oxidized polyethylene wax is used for organic pigments and carbon black that are difficult to disperse. There is a big difference between synthetic low molecular weight polyethylene wax and low molecular weight polyethylene wax made by polyethylene cracking.

    Other auxiliaries include coupling agents, antioxidants, light stabilizers, antistatic agents, fillers, etc., depending on the requirements and varieties, called multifunctional masterbatch, and the addition of brighteners is beneficial to molded products Demould and improve the surface brightness of the product.

    The performance indicators of color masterbatches in plastic color matching include color difference, whiteness, yellowness, yellowness, thermal stability, oxygen index, melt flow rate, etc. Of course, the fineness, migration, chemical resistance, and toxicity of the pigment are also Related to the performance of the masterbatch, some indicators are very important for special purposes, such as the fineness of the filter pressure value (DF value) of the fiber-grade masterbatch.