Masterbatch used in pigment, must pay attention to the pigment and plastic raw materials, additives with the relationship between the chosen points as described below.
(1) can not pigment and resin and various additives, solvent resistance, the migration of small, good heat resistance. In other words, the masterbatch can not participate in a variety of chemical reactions. Such as carbon black to be able to control the curing reaction of polyester plastic, so you can not add carbon black pigment in the polyester.
Plastic molding processing temperature is higher, so the pigment forming the heating temperature conditions do not break down color. General inorganic pigments better heat resistance, organic pigments and dyes, poor heat resistance, this point should be taken seriously enough in the choice of pigment varieties.
(2) pigment dispersion, tinting strength. The pigment is dispersed unevenly, will affect the appearance and performance of the products; pigment tinting strength, make the pigment increased use of material costs. The same pigment is dispersed in various resin and coloring power is not the same, so it should pay attention to the choice of pigment.
Pigment particle size and dispersion of pigment particle size is smaller, the better the dispersion, tinting strength.
(3) should be aware of other properties of the pigment, plastics used in food, children’s toys, the pigment should be non-toxic; for electrical aspects of plastic products should be selected electrical insulation and good pigment; for the outdoor aspects of plastic products, select resistant weathering properties and good pigment.
Masterbatch production process
Masterbatch production process is very strict, generally use a wet process. The masterbatch material by water grinding, phase, washing, drying, granulation made only so that product quality can be guaranteed.
Another pigment in the grinding treatment at the same time, but also a series of tests such as determination of the fineness of the sanding slurry measured the diffusion properties of the sanded grout determination sanding slurry solids content, and determination of colorant fine degree.