The white masterbatch seems unfamiliar but indeed familiar to many people. Almost everyone has used it. It has bright color, high color strength, good dispersion, high concentration, good whiteness, and strong hiding power. It is widely used in injection molding, blowing molding, drawing, casting, extrusion, blown film, foaming, sheet, pipe, pumping, hollowing molding, EVA, blowing molding, sheets, such as household appliances, toys, packaging materials, wires and cables, plastic bags, automobiles, building materials, sports and leisure products, packaging bags, bottles and other plastic products.
How to identify the quality of white masterbatch?
May wish to understand the main technical indicators of white masterbatch:
1, resistance to migration (grade) [≥ 4]
2, the moisture content (%) [≤ 0.30] 8, the total color difference [≤ 1.50]
3, melting temperature (℃) [125 ~ 200]
4, white masterbatch dispersibility: [no color dots, stripes]
5, lightfastness (level) [5-8]
6, white masterbatch appearance granular, uniform particles, uniform color
7, heat resistance (grade) [≥4]
If the white masterbatch meets the above criteria, it can be judged that the white masterbatch is of good quality.
Precautions when using white masterbatch
1. In order to reduce the color difference of the fibers after color matching, the white masterbatch shall be diluted to control the mixing ratio. The filaments shall be no less than 3% to 10%, the staple fibers not less than 1% to 3%, and the monochrome expanded continuous filaments are spinned with three-color equipment, the white masterbatch must be fed into the extruder after mixing. At the same time, to increase the mixing capacity of the melt itself, a mixing device can be added to the extruder section.
Second, white masterbatch mixing method is that after determination of the color silk color formula, the white masterbatch is evenly dispersed in polypropylene before spinning, which is the key to ensure product quality. There are two types of concrete mixing methods, one is the weight method and volume method. After the white masterbatch is melted in the extruder or in the back of the extruder, it is injected into the polypropylene melt with a small extruder and the uniformity is very good.
Third,  when choosing white masterbatch, according to the selection of the scope of use. Polypropylene masterbatch is divided into fine denier and coarse denier, coarse denier white masterbatch color can not be used for fine denier color. When spinning color, should consider the denier of the monofilament of the fiber, choose the same level of white masterbatch.
Fourth, the chosen white masterbatch must be better from the same manufacturer's products, in order to reduce costs high concentration white masterbatch should be selected. Pigments for white masterbatch have high, middle and low grades. When matching colors, white masterbatch of different grades should be properly selected according to the quality requirements of fiber-forming. In order to avoid the quality variation of the finished fiber caused by the different light and thermal stability of the pigment, in the color matching should choose the white color of the masterbatch that have the same level of light and heat stability and meet fiber quality requirements, and the concentration required for the coarse fiber is lower than the fine fiber. Its white masterbatch application ratio is proportional to the square root of the fiber denier.