A kind of high-concentration color color masterbatch and preparation method thereof

Abstract

The invention discloses a high-concentration colored master batch. The high-concentration colored master batch is composed of, by mass, 50-70% of colored pigment, 5-15% of a dispersing agent, 20-39% of resin and 0.5-1% of a processing aid. The invention further discloses a preparation method of the high-concentration colored master batch. The preparation method comprises the following steps of 1, weighing the colored pigment, the dispersing agent, the resin and the processing aid according to the mass percentage compounding ratio of the constitute raw materials, and mixing the raw materials in a high-and-low-speed blender mixer till the raw materials are caked; 2, adding the mixed raw materials into a three-roller grinding machine, and conducting grinding till the raw materials are dispersed uniformly; 3, adding the ground raw materials into a single-screw or a double-screw extruder for extrusion and granule cutting. The high-concentration colored master batch and the preparation method thereof have the advantages that the pigment is dispersed uniformly; the surface of the master batch is smooth and free of pores; black spots or toner points do not appear; the preparation method is simple; dispersity is good; consumption of the pigment is saved; no dust is generated in the processing process; a processed product is free of dust or pollution.

Description

technical field [0001] The invention relates to the technical field of plastic coloring, in particular to a high-concentration color masterbatch and a preparation method thereof. Background technique [0002] The color masterbatch disperses the toner evenly in the carrier resin, has a fixed shape, is convenient for customers to use, has a small amount of addition, and is clean and dust-free. The existing color masterbatch preparation process mainly includes the following types: [0003] 1. Raw materials are mixed by high and low speed mixers, and then enter the single-screw / twin-screw extruder to extrude and pelletize. In this process, except that the concentration of titanium dioxide and calcium carbonate masterbatch can reach 60% to 80%, it is difficult to disperse when the content of color, especially organic pigments with high oil absorption exceeds 20%. [0004] 2. Raw materials are kneaded by a kneader or an internal mixer, and then enter the single-screw / twin-screw ...

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Problems solved by technology

[0005] 3. The pigment in the masterbatch raw material is pre-dispersed with 50% dispersant and 50% pigment, and then processed according to the above process. This method is well dispersed, but the concentration of the pigment is limited by the concentration of the pigment pre-dispersion , but unable to increase the concentration of the pigment

In the prior art, the high-low speed mixer uses high-speed rotation to make the raw materials rub against each other. For the hard lumps and particles that have been formed, the ability to grind is limited. The kneader and the internal mixer use low-speed rotation to heat the raw materials. The thermoplastic raw material is slowly transformed from solid to glass or liquid. During the conversion process, the pigment is evenly dispersed in the thermoplastic raw material by using the strong shear force when the thermoplastic raw material is just softened. The dispersion of this method is better than that of high and low speed mixers. , but the energy consumption is much higher, and it is also the friction between raw materials, so when the pigment concentration is too high, there will be poor dispersion, and the higher the pigment concentration, the more difficult it is to disperse