Color masterbatch coloring requirements
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For the color materials used in the masterbatch, attention must be paid to the matching relationship between the colorant and the plastic raw materials and additives. The selection points are as follows.
(1) The coloring material cannot react with the resin and various auxiliary agents, and has strong solvent resistance, small mobility, and good heat resistance. That is to say, the masterbatch cannot participate in various chemical reactions. If carbon black can control the curing reaction of polyester plastic, carbon black can not be added to the polyester.
Since the molding temperature of the plastic product is high, the color material should not decompose and discolor under the molding heating temperature condition. Generally, inorganic pigments have good heat resistance, and organic pigments and dyes have poor heat resistance, which should be paid enough attention when selecting colorant varieties.
(2) The dispersibility and coloring power of the colorant should be good. When the color material is unevenly dispersed, it will affect the appearance performance of the product; when the coloring power of the color material is poor, the amount of color material will increase and the material cost will increase. The dispersibility and tinting strength of the same colorant in different resins are not the same, so you should pay attention to this when selecting the colorant.
The particle size of the colorant is also related to the dispersibility. The smaller the particle size, the better the dispersibility and the strong coloring power.
(3) It should be understood that other properties of colorants, such as plastic products used in food and children's toys, should be non-toxic; for plastic products used in electrical appliances, colorants with good electrical insulation should be selected; For outdoor plastic products, colorants with good weathering resistance should be selected.
2. Masterbatch production process
The masterbatch production process is very strict, and the wet process is generally used. The masterbatch is made by aqueous phase grinding, phase inversion, water washing, drying and granulation. Only the quality of the product can be guaranteed.
In addition, the pigment should be subjected to a series of tests, such as measuring the fineness of the sanding slurry, measuring the diffusion performance of the sanding slurry, determining the solid content of the sanding slurry, and measuring the fineness of the colorant.
There are four ways to process the masterbatch production:
(1) Ink method: As the name implies, it is a production method using ink color paste in the production of masterbatch, that is, a three-roll mill is used to coat a surface of a pigment with a low molecular protective layer. The ground fine color paste is then mixed with a carrier resin, then plasticized by a two-roll mill (also called a two-roll mill), and finally granulated by a single-screw or twin-screw extruder.
The process is as follows:
Ingredient mixing coarse color paste three-roll grinding fine color paste two-roll plasticating extrusion granulation
(2) Washing method: the pigment, water and dispersing agent are sanded to make the pigment particles smaller than 1 μm, and the pigment is transferred to the oil phase by a phase transfer method, and then dried to obtain a masterbatch. An organic solvent, as well as a corresponding solvent recovery unit, is required for phase inversion. The process is as follows:
Fine color paste rinse evaporation concentrate dry to add carrier extrusion granulation
(3) Pinching method: After blending the pigment and the oily carrier, the pigment is oleophilic, and the pigment is washed from the aqueous phase into the oil phase by kneading. At the same time, the surface of the pigment is coated by an oil carrier to stabilize the dispersion of the pigment and prevent the pigment from agglomerating.
(4) Metal soap method: after the pigment is ground, the particle size reaches about 1 μm, and the soap liquid is added at a certain temperature, so that the surface layer of each pigment particle is uniformly wetted by the soap liquid to form a saponification liquid, when the metal After the salt solution is added, it chemically reacts with the saponified layer on the surface of the pigment to form a protective layer of metal soap (magnesium stearate), so that the finely divided pigment particles do not cause flocculation, but protect a certain fine degree.
3. Precautions for use of masterbatch
(1) After the masterbatch is stored for a period of time, it will absorb moisture, especially PET, ABS, PA, PC, etc., so it should be dried according to the same process of the color particles and reach the water content requirement.
(2) It is very prudent to use the masterbatch to match the color to achieve the desired color, and the color difference and color change often occur.
(3) Masterbatches and other additives will react, so be careful when using them.
(4) The selection of the dilution ratio of the masterbatch should be noted. When a high dilution ratio is used, the production cost is low, but it is also limited by the processing equipment.