The relationship between colorants, plastic raw materials and additives

Masterbatch must pay attention to the relationship between color materials, plastic raw materials and additives in terms of technology. The main points of selection are as follows:
1. The coloring material can't react with the resin and various additives, and has strong solvent resistance, small mobility and good heat resistance.
In other words, the masterbatch cannot participate in various chemical reactions. For example, carbon black can control the curing reaction of polyester plastics, so carbon black can not be added to the polyester.
Masterbatch technology Because plastic molding products have higher processing temperatures, the colorants should not decompose and discolor under the molding heating temperature conditions. 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 of the same colorant in different resins is not exactly the same as the tinting strength, 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. The masterbatch technology process requirements are very strict, and the commonly adopted masterbatch technology is a wet process. The masterbatch is made by aqueous phase grinding, phase inversion, water washing, drying and granulation. Only the quality of the product can be guaranteed.
The masterbatch technology process has the following four methods:
(1) Masterbatch technology Process Ink method: In the production of masterbatch, the production method of ink paste is adopted, that is, a low-molecular protective layer is coated on the surface of the pigment by three-roll grinding. The ground fine color paste is then mixed with a carrier resin, then plasticized by a two-roll plasticizer (also called a two-roll mill), and finally granulated by a single-screw or twin-screw extruder.
(2) Masterbatch technology Process: The pigment, water and dispersant are sanded to make the pigment particles less than 1 μm, and the pigment is transferred to the oil phase by 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.
(3) Masterbatch technology process kneading method: After the pigment is mixed with the oil carrier, the pigment is immersed from the water 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 coagulating.
(4) Masterbatch technology process Metal soap method: After the pigment is ground, the particle size reaches about 1μm, and the soap liquid is added at a certain temperature, so that the surface layer of each pigment particle is evenly wetted by the soap liquid to form a layer of saponification. Liquid, when the metal salt solution is added, 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 protection A certain degree of fineness.

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