A method for improving the hue of granular iron oxide black pigment

Abstract

The invention provides a method for improving particle iron oxide black pigment hue. The method comprises the steps that a dispersing agent aqueous solution, a binding agent aqueous solution and a hue adjusting agent aqueous solution are mixed, the mixture is evenly sprayed to particles of iron oxide black pigment, and therefore the mixed solution permeates into each particle of the iron oxide black pigment; the dispersing agent comprises one of sulfonate diffusing agent and dispersant NNO, and the dosage of the dispersing agent is controlled to account for 0.08-0.16% of the mass fraction of the iron oxide black pigment; sodium silicate is selected as the binding agent, and the dosage of the binding agent is controlled to account for 0.4-0.8% of the mass fraction of the iron oxide black pigment; urea is selected as the hue adjusting agent, and the dosage of the hue adjusting agent is controlled to account for 0.008-0.016% of the mass fraction of the iron oxide black pigment. The method has the advantages that the manufacturing technology is simple, the cost is low, tinting strength is greatly improved, the pigment dosage is reduced, the production cost of clients is reduced, and the particle iron oxide black pigment hue can be significantly improved.

Description

technical field [0001] The invention relates to the production of a granular iron oxide black pigment, in particular to a method for improving the hue of the granular iron oxide black pigment, and belongs to the field of chemical pigments. Background technique [0002] Ordinary iron oxide black pigments are in powder form, and there are certain difficulties in transportation, measurement, packaging, dust, etc. For example, in terms of transportation and packaging, ordinary iron oxide black powder has a small specific gravity, relatively large volume, and high transportation costs . In terms of metering, ordinary iron oxide black pigments are in powder form and have relatively poor fluidity, so there are great difficulties in the metering process. In addition, in terms of dust and environmental protection, ordinary powdered iron oxide black is easy to cause dust pollution to the environment, has considerable harm to operators, and is easy to cause occupational diseases, so t...

AI Technical Summary

Problems solved by technology

[0002] Ordinary iron oxide black pigments are in powder form, and there are certain difficulties in transportation, measurement, packaging, dust, etc. For example, in terms of transportation and packaging, ordinary iron oxide black powder has a small specific gravity, relatively large volume, and high transportation costs

In terms of metering, ordinary iron oxide black pigments are in powder form and have poor fluidity, so there are great difficulties in the metering process.

In addition, in terms of dust and environmental protection, ordinary powdered iron oxide black is easy to cause dust pollution to the environment, has considerable harm to operators, and is easy to cause occupational diseases, so the powdered iron oxide black is made into granular iron oxide black It can improve the problems in transportation, metering, packaging, environmental protection, etc., but after the production of granular iron oxide, the pigment will also have certain shortcomings, such as the deterioration of the dispersibility of the pigment, the deterioration of the hue, and the deterioration of the coloring power. and other issues. At present, many companies on the market have been able to produce granular iron oxide black pigments by themselves, and the strength and roundness of granular iron oxide can meet the use standards. Therefore, in the production process of granular iron oxide, there is often the problem of reduced pigment dispersibility, and the reduced dispersibility will easily lead to poor hue of the pigment, which will eventually lead to an increase in usage

[0003] Although many companies add dispersants such as sodium carboxymethyl cellulose and lignin salts in the process of producing granular iron oxide black, the dispersion effect is not ideal. Looking for a dispersant that can greatly improve the dispersibility of pigments Dispersant, combined with a suitable pigment hue regulator, makes the hue of the pigment unchanged or better than before granulation, and becomes one of the most important links in the production process of granular iron oxide black pigment

Images