First, the masterbatch
1. Definition of masterbatch: A plastic mixture containing a high percentage of dosage aid. It is usually a concentrate made by mixing and granulating 30-70% of auxiliary agent and 70-30% of carrier resin.
2. Production method: The additive to be added into the resin is first added into a specific carrier to form pellets, and then pellets containing a high concentration of additives are added to the resin.
3, the classification of masterbatch
(1) Fill masterbatch: The main filler, reduce costs and improve product performance.
(2) Masterbatch: consists of a colorant, a carrier, and a dispersant; it can reduce the amount of colorant and improve the uniformity of color.
(3) Modified masterbatch: flame retardant masterbatch, degraded masterbatch, longevity masterbatch, flavor masterbatch and so on.

Second, color masterbatch
1. Definition: The masterbatch is a plastic granule obtained by uniformly placing an excessive amount of pigment in a resin. A highly concentrated, high-performance color formulation.
2. Development history: From the 1970s, foreign countries began to use color masterbatch coloring; China began in 1975, the study of masterbatch.
3, status quo: Currently has a considerable production capacity, and has been widely used.
4. Composition: colorant, carrier and dispersant
(1) Selection of colorants
Coloring agents are divided into inorganic pigments, organic pigments and dyes. The amount of colorant added generally accounts for about 15-40% of the mass of the masterbatch. Commonly used organic pigments are: phthalocyanine red, phthalocyanine blue, phthalocyanine green, fast red, macromolecule red, macromolecular yellow, permanent yellow, permanent purple, azo red and so on. Commonly used inorganic pigments are: cadmium red, cadmium yellow, titanium dioxide, carbon black, red iron oxide, yellow iron oxide and so on.
(2) Selection of carriers
The carrier is the matrix of the masterbatch. The special masterbatch generally chooses the same resin as the product resin as the carrier, and the compatibility between the two is best, but at the same time, the fluidity of the carrier should also be considered. The carrier is added in an amount of about 30-70% of the master batch.
(3) The choice of dispersant
The dispersant on the one hand facilitates the dispersion of the colorant in the carrier; on the other hand, it improves the processing flow of the masterbatch. The dispersant should have a lower melting point than the resin, good compatibility with the resin, and a good affinity for the pigment. The amount can be about 15%.
(4) Additives
Such as flame retardant, brightening, antibacterial, anti-static, anti-oxidation and other varieties, unless the customer requests, normally do not contain the above additives in the masterbatch.
5, the advantages of using masterbatch
(1) Better dispersibility of the pigment in the product. In the production process of masterbatch, the pigment must be refined to improve the dispersibility and coloring power of the pigment. The carrier of the special color masterbatch is the same as the plastic type of the product and has a good match. After heating and melting, the pigment particles can be well dispersed in the plastic of the product.
(2) It helps to maintain the chemical stability of the pigment. When the pigment is used directly, the pigment will undergo water absorption and oxidation during the storage and use of the pigment. When the color masterbatch is prepared, the resin carrier separates the pigment from the air and water, and the quality of the pigment can be prevented for a long period of time. change.
(3) to ensure the stability of the color of the product. The masterbatch particles are similar to the resin particles and are more convenient and accurate in metering. They do not adhere to the container during mixing, and the mixture with the resin is also uniform. Therefore, it is possible to ensure the stability of the additive amount, thereby ensuring the stability of the product color.
(4) Protect the health of operators. Pigments are generally powdery, and are easy to fly when added and mixed. Inhalation by the human body will affect the health of operators.
(5) Keep the environment clean
(6) Easy to use

Third, the preparation of masterbatch
color masterbatchgenerally adopts wet process. One of the common flushing methods is to grind the pigment, water and dispersant so that the pigment particles are less than 1 μm, use the pigment oleophilic characteristics, and use organic solvents to transfer the pigment into the oil phase, and then evaporate and dry to obtain the masterbatch. The process flow is as follows:

Fourth, the common defects of masterbatch
1, in the sunlight, the product has stripe-like paint strips, this problem needs to be considered from two aspects: plastic physical and mechanical properties and plastic molding process:
1.1 The temperature of injection molding equipment is not controlled well, and the masterbatch cannot mix well with the resin after entering the mixing chamber.
1.2 The injection molding machine did not add a certain back pressure, and the mixing effect of the screw was not good.
1.3 The masterbatch has poor dispersion or poor resin plasticization.
Process can be debugged as follows:
(1) The temperature of the kneading chamber is slightly increased by the discharge port portion.
(2) Apply a certain back pressure to the injection molding machine.
If the above adjustment is still not good, it may be the problem of dispersibility or matching of masterbatch and resin, and contact the masterbatch manufacturer to solve it.
2, after using a certain masterbatch, the product appears to be more easily broken
This may be due to poor diffusion and miscibility caused by the poor quality of dispersants or auxiliaries used by the manufacturer, affecting the physical and mechanical properties of the product.
3, according to the proportion of color masterbatch use, the problem is too dark or too shallow, but there are many possibilities, specifically:
3.1 Color masterbatch has not been carefully tried, too little or too much pigment.
3.2 Measurements are inaccurate when used, and there is a large number of phenomenon that domestic enterprises, especially SMEs, randomly measure.
3.3 There is a problem with the matching of color masterbatch and resin, which may be due to the improper selection of the masterbatch carrier, or it may be that the manufacturer arbitrarily changes the resin type.
3.4 Improper temperature of the machine, the masterbatch stays in the machine for too long.
Processing procedure: First, check whether the resin type matches the masterbatch and whether the measurement is accurate. Second, adjust the machine temperature or the rotation speed. If there are still problems, contact the masterbatch manufacturer.
4, the same color masterbatch, resin and formula, different injection molding machine injection products why the color depth?

This is often the cause of the injection molding machine. Different injection molding machines may cause differences in the mechanical conditions due to differences in manufacturing, use time, or maintenance conditions, and in particular the difference in the degree of closeness between the heating elements and the cartridge, so that the dispersion state of the master batch in the cartridge is also different. The phenomenon will appear.

Do coloring products fade without coloring?

There is no absolute non-fade products, the use of coloring products coloring products may still fade, but only for different grades of different product levels, some of the more obvious, while others are difficult to detect.