The compatibility of the black masterbatch is one of the factors that determines the quality of the masterbatch. If the masterbatch is produced using chips or recycled materials, it may contain contaminants or other non-meltable polymers. This can cause unforeseen, unmanageable troubles, wasting the end consumer's time and materials. At this time, primer resin can be used to produce high-quality color masterbatch, and the masterbatch has good compatibility during the melting process. High quality masterbatches can be produced using LLDPE, LDPE, HDPE, PP, PS, SAN, PA and other materials.
Specially polymerized black masterbatches are available if engineering grades and stringent physical properties are specified. Several large international masterbatch manufacturers are conducting research, trying to produce the so-called global universal black masterbatch. These masterbatches are widely compatible with other raw materials, have good rheology, and can be used flexibly.
The commonly used black masterbatch technology is a wet process. The color masterbatch is made by water phase grinding, phase inversion, water washing, drying and granulation. Only in this way can the product quality be guaranteed. In addition, while the pigment is being ground, a series of color masterbatch technical tests should be carried out, such as measuring the fineness of the sanding slurry, measuring the diffusion performance of the sanding slurry, measuring the solid content of the sanding slurry, and measuring the fineness of the color paste, etc.
The black masterbatch is generally composed of three parts, the colorant carrier dispersant, after being kneaded by a high-speed mixer, crushed, extruded and pulled into granules, the masterbatch has high concentration, good dispersibility, cleanliness in the process of plastic processing and other significant advantages.
The mainstream black masterbatch production equipment is mainly twin-screw extruder. The common black masterbatch production process is: batching, mixing, extrusion, k-stretching, cooling, all particles, and packaging. The defect in the appearance of the masterbatch product is a major quality problem. The possible reasons for this problem include the production process of the masterbatch, the quality of the raw materials of the masterbatch, the production equipment of the masterbatch, and the production environment.
Problem 1: The black masterbatch has long strips. Lengths greater than 2 times of normal particles are regarded as long strips. The main reasons are that the strip is pulled or broken when the machine is turned on, the direction of the strip is not straight, and the pelletizer is worn or has gaps.
Solution:
1. During normal production, adjust the direction of the strip entering the pelletizer and adjust the length of the water.
2. Seriously broken bars during production need to be adjusted and dealt with.
3. Pay attention to the inspection of the granulating motor knife, and replace the damaged movable knife in time.
4. Appropriate vibrating screen should be used for the long strips that appear and sieved.
Question 2: The black masterbatch has continuous grains. Two or more particles joined together side by side are called concatemers. The main reasons are that the strip is broken when pulling the strip, and the length of the water is not enough.
Solution:
1. When extruding the strands, use a guide wheel with a suitable width to separate the connected strands.
2. Adjust the appropriate cooling water length, that is, reduce the continuous grain.
3. For the contiguous grains that appear, the vibrating screen with appropriate mesh size can be used for sieving.
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