PP masterbatch production process and masterbatch composition of the basic composition of the same masterbatch quality plays a decisive role! So, for brewing masterbatch masterbatch of four kinds of process, you know in the end how much? The following Xiaobian to bring you a comprehensive and thorough understanding of the masterbatch produced by the four kinds of polypropylene masterbatch process!

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Polypropylene macromolecules do not contain polar groups or can react with the dye molecules of the group, and the high degree of crystallinity polypropylene fibers, compact structure, so the dyeing of polypropylene is very difficult, the color fastness is quite poor.

To solve the polypropylene fiber is not easy to dye, usually the following three methods:

1. The use of copolymerization or graft copolymerization of the introduction of the dye molecules to accept the polar groups. Commonly used copolymers are acrylic acid, acrylonitrile, vinyl pyridine and so on.

2. Polypropylene with a small amount of dye acceptor blending and extrusion. One approach is the introduction of organometallic compounds Ni or A1, Zn; another approach is mixed with cationic organic nitrides, such as polyvinyl pyridine and pyrrolidone derivatives. Since this method does not change the fiber structure, and does not affect its physical properties, so is a more practical method.

3. Spinning before the use of color. That is, the pigment is added to the polymer prior to melt spinning. The method also includes melt coloring and master coloring.

At present, the most commonly used at home and abroad coloring method of masterbatch or masterbatch coloring.

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Several Production Methods of PP Masterbatch

Production method of dry powder masterbatch
Pigment dry powder masterbatch production process shown in Figure 1.

The investment in the production equipment is low, and the cost is low because the low-cost pigment is used. This production method in some small masterbatch manufacturers are more common. However, the weakness of this method is that the pigment can not be fully refined treatment, pigment particle size can not meet the requirements, so the masterbatch can only be used in the injection molding and other requirements of the particle size of the field is not high. In the production of polypropylene fibers can only be used in some carpet yarn and other coarse denier fibers.

Pretreatment of pigment masterbatch production method
The masterbatch used in the production of pigments must be refined through the pigment and surface treatment, the system can have a good masterbatch quality. The advantage of this method of production is the simplicity of the process, see Fig. Equipment, fixed investment, the drawback is that the pigment is not available. Production flexibility is limited, and the particle size of the pigment can not be controlled.

Foreign manufacturers of the application of the typical Dainichisee and West Germany Hirst and so on. Domestic masterbatch manufacturers also have many use this method of production, more typical is the new fiber masterbatch factory. The plant production process is more simple: the dispersant, pre-dispersed pigments and resin into the mixer at the same time blending, the twin-screw extruder made of masterbatch.

Pigment dispersion masterbatch production method (wet process)
The production method comprises the following steps: the particle size of the pigment is reduced by mechanical grinding and surface active agent in the water phase, and the pigment is transferred from the water phase to the oil phase through a certain chemical treatment and is combined with the dispersant to form The occurrence of re-agglomeration of the treatment-type pigments, and then mixed with the resin in a certain proportion of granulation to produce masterbatch. The production process shown in Figure 3.

The advantages of this method are that it has the ability to control the particle size of the pigment, can select the pigment powder and make it get excellent coloring power, opacity and other optical properties after processing, At the same time can be applied to the pigment particle size requirements of high fine denier polypropylene production, that is able to produce high-quality masterbatch.

Application of the production process abroad, a typical manufacturer is a Ciba-based company in Switzerland. China is currently using the pigment refining processing masterbatch production of the manufacturers of Beijing Yanshan Petrochemical Company Resin Application Institute, the introduction of a Ciba-Jiaji technology; the other is Shanghai Dye Chemical Plant 12, the plant is used kneading method , The production process shown in Figure 4.

Jin Cai concluding remarks

The development direction of polypropylene - is the production of polypropylene fine denier, the corresponding masterbatch in the pigment particle size put forward higher requirements. Due to the fact that China's pigment industry is still relatively backward compared with foreign countries and lacks the necessary means of pigment pretreatment, wet master batch production method is a kind of masterbatch production method suitable for China's national conditions.