Introduction: The application of plastic products is quite extensive, with various colors and vibrant colors on the market, loved by the public. So, how is the coloring of injection molding products processed? What factors cause product fading? This article briefly describes the methods of plastic coloring and fading factors, which can be referenced by purchasing friends:
The coloring method has a great relationship with the colorant used and is closely related to the plastic’s properties, molding parameters, and the additives used. For example, pearlescent powder can be added, and talcum powder can be added to make PET transparent color become opaque color (adding some color powder for color adjustment). The formation of water ripples is related to the amount of pearlescent powder added.
Pigments generally fall into three categories: inorganic pigments, organic pigments, and dyes.
They have good temperature resistance and weather resistance, but the disadvantages are poor coloring power and poor dispersibility. It is mainly mineral refining, with a temperature resistance of over 300 degrees, and is not suitable for transparent and bright colors.
They have poor temperature resistance and good dispersibility, and can be used for elastomers. Petrochemical refining;
They have good temperature resistance, the best dispersibility, and high vividness. The disadvantage is that they are more prone to migration, and are not suitable for elastomers.
Good dispersibility, suitable for small-batch plastic processing, low cost, saving the consumption of manpower and material in the process of coloring masterbatch and coloring paste.
Not suitable for film blowing, spinning products, using pigment coloring, because the pigment powder is evenly distributed in the resin to be colored, so its dispersibility is better.
2.Coloring with Color Masterbatch
Coloring with color masterbatch employs a certain process and corresponding equipment, and under the effect of the additive, pigments (or dyes) are mixed into the carrier. Through heating, plasticization, stirring, and cutting actions, the molecular structure of the pigments and the carrier resin become thoroughly combined and eventually made into particles similar in size to resin particles.