Method for controlling viscosity of iron oxide yellow with amino acid crystal form control agent

Abstract

The invention relates to a method for controlling the viscosity of iron oxide yellow with an amino acid crystal form control agent. The method provided by the invention utilizes the chelating effect of amino acid to provide a stable nuclear locating point, reduces bifurcation and shrinks the length-diameter ratio during iron oxide yellow crystal growth under the action of the crystal form controlagent, and makes the crystal smoother, thus lowering the viscosity of iron oxide yellow.

Description

technical field [0001] The invention relates to a low-viscosity iron oxide yellow pigment, in particular to preparing low-viscosity iron oxide yellow by adding an amino acid crystal form control agent in a controlled reaction process. Background technique [0002] Iron oxide yellow, also known as iron oxyhydroxide, its molecular formula is FeOOH or Fe 2 o 3 ·H 2 O, in the form of yellow powder, its particle shape is needle-like, has high coloring power, hiding power, and is non-toxic and harmless. It is an environment-friendly inorganic pigment, and its light resistance reaches 6-7 grades. Iron oxide yellow pigments are widely used in building materials, coatings, paints, plastics, rubber, electronics, industrial catalysts, tobacco, cosmetics and other industries. [0003] Due to the difference in surface charge distribution and particle shape, ordinary iron oxide yellow has high viscosity and has many limitations in the application field of coatings. Compared with other...

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Problems solved by technology

At present, high solid content and low VOC is an important development target of the coating industry, and the viscosity of the pigment determines the size of the solid content. Excessively high pigment viscosity leads to high flow resistance of the coating, which is extremely unfavorable to production.

[0006] At present, relevant literature reports at home and abroad show that the viscosity of iron oxide yellow can be improved by changing the surface charge of iron oxide yellow particles or reducing the aspect ratio of iron oxide yellow particles. In China, there is a patent with application number 201410767118.7 published by Zhejiang United Pigment "A low-viscosity iron oxide yellow pigment", the principle of which is to destroy the shape of part of the iron oxide yellow pigment particles by grinding with steel balls, and only partially improve the aspect ratio of the powder and the consistency of the aspect ratio is poor, but it cannot shrink all the particles as a whole. The aspect ratio of iron oxide yellow particles, although this method reduces the viscosity of the pigment to a certain extent, but the effect is not obvious enough to destroy the structure and change the hue of the pigment; Nantong Baoju Pigment Co., Ltd. published a patent number of ZL201310277999. X's patent of 'a method for reducing the viscosity of iron oxide yellow pigment' is to improve the viscosity of iron oxide yellow by changing the charge on the surface of iron oxide yellow particles. The effect is ideal, but there is still room for improvement; Zhejiang Huayuan Pigment published Application No. ZL201610596145.1 'A Low Viscosity Iron Oxide Yellow' patent has a certain effect on reducing the viscosity of iron oxide yellow through high-pressure reaction and controlling the system temperature, but the high-pressure reaction is highly dangerous and consumes a lot of energy. Due to the size limitation of the reactor , lower output

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