Environment-friendly preparation method of plastic color master batch

Abstract

The invention discloses an environment-friendly preparation method of a plastic color master batch. The preparation method is characterized in that an inorganic pigment is dissolved in a supercriticalfluid; then the supercritical mixed solution is mixed with a resin carrier; the supercritical mixed solution permeates into a plurality of hole structures of the resin carrier; the inorganic pigmentparticles are gradually deposited in the carrier through reduced pressure expansion; and finally, separating and drying are performed for obtaining the master batch. The preparation method provided bythe invention has the following advantages that no solvent is involved in the whole preparation process, and no harmful substance is discharged, so that the problem that industrial three wastes (waste gas, waste water and industrial residue) are difficult to treat is fundamentally solved, and the atmosphere and water resources are effectively protected; the natural utilization rate is high, and the recycling rate of carbon dioxide can reach 90% or more; surfactants such a dispersing agent, a detergent and the like are not needed in the preparation process; and the dyeing production efficiencyis high, the supercritical carbon dioxide fluid is low in viscosity, large in diffusion coefficient, and small in diffusion boundary layer, so that the dissolved monomolecular inorganic pigment can rapidly permeate into gaps of the carrier resin, the coloring rate is far larger than coloring rates of traditional systems, the production period is greatly shortened, and the production efficiency isimproved.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to an environment-friendly method for preparing color material masterbatch. Background technique [0002] The traditional methods of plastic coloring include dry (floating dyeing) coloring, paste colorant coloring, liquid colorant coloring, color particle coloring, etc. These methods all have many disadvantages, such as poor dispersion of pigments, large flying, polluting the environment, endangering the health of workers, difficult control of pigment metering, poor coloring effect, and high cost. Especially in products with a very small amount of pigment added, due to the poor dispersibility of the pigment, color difference will occur. For products with high pigment concentration, due to the poor affinity between the pigment and the resin, the processing performance of the product is not good, and the physical and mechanical properties are reduced. Masterbat...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems of uneven dispersion of inorganic pigments in traditional plastic color masterbatches and compatibility with carrier resins, and the preparation requires the use of a large number of chemical reagents to modify inorganic pigments, which is likely to cause chemical pollution

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