Method for preparing natural green nano inorganic material-modified organic pigment

Abstract

The invention provides a method for preparing a natural green nano inorganic material-modified organic pigment. The natural green nano inorganic material is sepiolite; and the method comprises the following steps: initially treating the sepiolite; modifying the sepiolite; performing diazotization reaction; preparing a coupling agent and adding a pigment additive; and performing coupling reaction and pigmentation to obtain the modified azo organic pigment. The method has the advantages that: the natural green nano inorganic material sepiolite is added in the process of producing the organic pigment, so the pigment production and pigmentation are synchronously integrated, the color strength, the hiding power, the water dispersibility and the thermal stability of the azo organic pigment are improved, the cost is saved, the conventional production and modification process is shortened, and the method has good environmental benefit and economic benefit.

Description

technical field [0001] The invention belongs to the preparation of pigments in fine chemical products, in particular to a method for preparing organic pigments modified by natural green nano inorganic materials for original pigment products. Background technique [0002] Organic pigments are rich in varieties, complete in color spectrum and bright in color, and are widely used. However, most organic pigments have poor light resistance stability, heat resistance stability, solvent resistance, migration resistance, and hiding power. In use, there are often phenomena such as easy fading, easy floating, weak tinting strength, and poor water dispersibility, which are difficult to meet the requirements of use. Therefore, it is necessary to modify and modify organic pigments to improve the performance of pigments. [0003] The currently commonly used pigment modification methods or pigmentation methods include surface modification, inorganic hybridization, latent dye modification ...

AI Technical Summary

Problems solved by technology

The surface modification method aims to deposit or coat single-molecule or multi-molecular-layer substances on the surface of pigment particles, including the use of surfactants, modifiers, derivatives of the pigment itself, etc., to change the properties of the pigment particles. performance, but the process is complicated and the cost is high

The inorganic hybrid method combines two or more materials to obtain new materials by combining the advantages of several materials. This method is simple in process but the intermolecular bonding is weak, and it cannot withstand high shear force and strong extrusion. force

Hidden pigment modification technology can be regarded as a new means to adjust the molecular structure in the process of pigment synthesis and finally change the shape of the pigment. Although this method can achieve excellent dispersion effect, the stability is poor. After heat treatment or adjusting the pH value of the medium or With ultraviolet radiation, can be converted back to the original parent pigment

The core encapsulation method uses inert substances as the core and the material with pigment characteristics as the outer coating layer for modification. This method has a simple production process and can improve weather resistance, but due to the process and equipment, the distance between the core and the pigment Mutual adsorption is not strong, with a probability distribution, and the product quality is extremely unstable

[0004] In addition, the current pigment modification and pigmentation processes mostly use post-finished products, prolonging the process route, thereby increasing production costs, causing a large amount of pigment intermediates to be produced, increasing the discharge of "three wastes", and bringing environmental governance Enormous pressure

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