Masterbatch is composed of an excess of chemical additives, carrier resins and dispersants. The masterbatch is an aggregate obtained by uniformly superabsorbing a pigment (dye) in a resin. The color concentrate is mainly composed of a pigment, a dispersant, and a carrier resin.

  The masterbatch technology process is very strict, and the commonly used masterbatch technology is a wet process. The color masterbatch is ground, phase-inverted, washed, dried, and granulated by water, so that the quality of the product can be guaranteed. In addition, the pigment should be subjected to a series of masterbatch technology tests, such as determining the fineness of the sanding slurry, measuring the diffusion properties of the sanding slurry, determining the solid content of the sanding slurry, and measuring the fineness of the colorant. project.

  Some advantages of using a masterbatch:

  1. Conducive to maintaining the chemical stability and color stability of the pigment;

  2. Make the pigment more dispersible in plastics;

  3. Protect the health of the operator;

  4. The process is simple and the color change is easy;

  5. Clean, non-staining utensils;

  6. Save time and raw materials.

  Since the pigment directly contacts the air during storage and use, moisture absorption, oxidation, agglomeration, etc. may occur, and the direct use may cause color spots on the surface of the plastic product, the hue is dark, the color is easily faded, and it is caused by mixing. Dust is flying, affecting the health of the operators. The masterbatch is mechanically processed in the production process, and the pigment is refined, and the pigment and the resin carrier and the dispersing agent are thoroughly mixed to separate the pigment from the air and moisture, thereby enhancing the weather resistance of the pigment and improving the pigment. The dispersibility and tinting strength of the pigment, the hue is bright. Since the masterbatch is similar in shape to the resin particles, it is more convenient and accurate in metering, and does not adhere to the container during mixing, thereby saving time for cleaning the container and the machine and raw materials used for cleaning.

   Basic composition of color masterbatch

   Pigment or dye

   Pigments are further divided into organic pigments and inorganic pigments.

   Commonly used organic pigments are: phthalocyanine red, phthalocyanine blue, phthalocyanine green, fast red, macromolecular red, macromolecular yellow, permanent yellow, permanent solid purple, azo red and so on.

   Commonly used inorganic pigments are: cadmium red, cadmium yellow, titanium white powder, carbon black, iron oxide red, iron oxide yellow and the like.

   2. Carrier

   The carrier is the matrix of the masterbatch. The special color master generally selects the same resin as the carrier resin as the carrier, and the compatibility between the two is the best, but the fluidity of the carrier is also considered.

   3. Dispersant

   The dispersing agent promotes uniform dispersion of the pigment and no longer agglomerates. The melting point of the dispersing agent should be lower than that of the resin, have good compatibility with the resin, and have good affinity with the pigment. The most commonly used dispersants are: polyethylene low molecular waxes, stearates.

   4. Additives

   Such as flame retardant, brightening, antibacterial, antistatic, anti-oxidation and other varieties, unless the customer asks, in general, the color masterbatch does not contain the above additives.

   Color masterbatch and grade

   The classification method of color masterbatch is commonly used in the following types:

   Classified by carrier: such as PE masterbatch, PP masterbatch, ABS masterbatch, PVC masterbatch, EVA color masterbatch, etc.;

   Classified by use: such as injection color masterbatch, blown color masterbatch, spinning masterbatch, etc.;

   Each variety can be divided into different levels, such as:

   1. Advanced injection masterbatch

   Used in cosmetic packaging boxes, toys, electrical enclosures and other advanced products.

   2. Ordinary injection color masterbatch

   Used in general daily plastic products, industrial containers, etc.

   3. Advanced blown film masterbatch

   Used for blow molding coloring of ultra-thin products.

   4. Ordinary blown film masterbatch

   It is used for blow molding coloring of general bags and woven bags.

   5. Spinning masterbatch

   It is used for textile fiber spinning and coloring. The color masterbatch pigment particles are fine, the concentration is high, the tinting strength is strong, and the heat resistance and light resistance are good.

   6. Low-grade color masterbatch

   Used to manufacture low-grade products that do not require high color quality, such as trash cans, low-grade containers, etc.

Use of color masterbatch and precautions:

   The use of color masterbatch is very simple, as long as it is thoroughly mixed with plastic resin according to a certain ratio, and can be extruded and formed according to various plastic processing requirements.

   It should be noted that when converting the color, the hopper must be cleaned, and the residual material in the barrel of the machine should be washed out with the original color plastic or adding the screw cleaning agent. Replace the new filter net, preferably the filter net of 100 mesh or more; pay attention to the temperature. Is it correct to prevent color changes?

The effect of using color masterbatch on product cost:

 This is the case in most cases. However, in some cases, coloring with color masterbatch is more economical than coloring with toner, because colorists can achieve higher color pigment coloring through a combination of several lower-priced pigments.

  Also consider the following two phenomena:

  1. In many cases, the choice of pigments used by plastics manufacturers in color matching is not the most economical, and because of the lack of familiarity with pigments, it is very common to repeatedly test the color and cause waste of manpower and materials. This problem does not exist with the color master.

   2. The products colored with color masterbatch and the products colored with toner are completely different in grade, and the selling price is also higher. The higher selling price is often higher than the cost increased by using color masterbatch, so the color The mother can create "profit" instead.

   From this perspective, in some cases, coloring with color masterbatch is more "economical" than coloring with toner.

   Problems and treatments when plastic products are colored

  1. Product surface granulation:

  Main reasons: 1 barrel and die have impurities; 2 temperature is not correct; 3 material stays in the barrel for too long; 4 color masterbatch or toner dispersion is not treated well; 5 filter has been perforated.

  Treatment method: adjust the temperature of the plastic machine to 10-20 °C below the normal temperature, start the plastic machine, and re-clean the work with the primary color plastic resin at the slowest speed. If necessary, disassemble the die and adjust the temperature. Replace the filter. Switch to a well-dispersed masterbatch or toner to re-commission.

   2. Uneven diffusion:

   Main reasons: 1 uneven mixing; 2 temperature is not suitable; 3 color masterbatch and raw materials are poorly soluble; 4 plastic machine itself has poor plasticizing effect; 5 color masterbatch ratio is too small.

   Treatment method: full agitation, appropriate temperature adjustment, replacement of color masterbatch or raw materials, replacement of other machine production, adjustment of color mother delivery ratio.

   3. Frequent cuts

   Main reasons: 1 temperature is not correct; 2 raw material affinity is poor; 3 color master dispersion is too poor; 4 color mother delivery ratio is too high.

   Treatment method: adjust the temperature accurately, replace the raw materials used, replace the well-dispersed masterbatch, and reduce the proportion of color masterbatch.

   4. The color has changed:

  Main reasons: 1 The raw materials used are inconsistent; 2 The plastic machine is not clean; 3 The color masterbatch or toner used is low in temperature resistance, and the temperature is too high to eliminate color; 4 The material door is not clean; 5 The process changes 6 color masterbatch or toner itself has color difference; 7 nozzle material is not properly matched; 8 mixer is not clean or the mixing time is not controlled.

  Treatment method: use the raw materials with the same color as the board and adjust the proportion of the nozzle material; thoroughly clean the plastic machine, the material feeding door and the mixing machine; use the color masterbatch or toner with appropriate temperature resistance and uniform color. ; Use a stable processing technology.