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Method for producing high-density high-quality iron oxide yellow pigment

An iron oxide yellow, production method technology, applied in chemical instruments and methods, inorganic pigment treatment, fibrous fillers, etc., can solve the problems of high oil absorption, low oil absorption, and high color strength, and achieve reduced usage and oil absorption. Low, high tinting strength effects

Active Publication Date: 2008-10-29
SHENGHUA GROUP DEQING HUAYUAN PIGMENT
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AI Technical Summary

Problems solved by technology

[0004] In order to solve the technical problems of low bulk density and high oil absorption of the above-mentioned iron oxide yellow pigment, the object of the present invention is to provide a production method of high-density heavy iron oxide yellow pigment, the product prepared by the method has low oil absorption , High coloring strength

Method used

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  • Method for producing high-density high-quality iron oxide yellow pigment
  • Method for producing high-density high-quality iron oxide yellow pigment
  • Method for producing high-density high-quality iron oxide yellow pigment

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Embodiment Construction

[0021] Such as figure 1 The production method of shown high-density heavy iron oxide yellow pigment comprises the following steps:

[0022] Part 1: Pre-production process

[0023] This part is mainly divided into two steps: seed crystal preparation and oxidation.

[0024] The specific process of seed crystal preparation is as follows: a certain amount of ferrous sulfate is put into the seed crystal reaction tank, reacted with sodium hydroxide solution, and oxidized by passing through air, and finally ferrous hydroxide is oxidized into ferric yellow crystal seeds.

[0025] The specific operation process of oxidation is as follows: fill up the iron sheet in the cleaned bucket, put the prepared crystal seed into the reaction bucket, then add a certain amount of water to dilute, control the content of ferrous iron, and open the steam and air valves at the same time to control Air is blown in to stir the material liquid, and the amount of iron sheet in the barrel is checked and a...

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Abstract

The invention relates to a method for preparing inorganic pigments, more particularly relates to a method for preparing yellow high-density heavy-weight iron oxide pigments. The method comprises the following steps: preparing and oxidizing seed crystals, screening, pressing and drying to obtain filter cakess, drying the filter cakes with a double-paddle dryer and a disk-type continuous dryer, and grinding when the filter cakes is dried with the disk-type continuous dryer. The bulk density of the product is in the range of 0.70g / ml to 1.2g / ml. Compared with the common yellow iron oxide pigment, the bulk density of the yellow high-density heavy-weight iron oxide pigment is approximately doubled, the oil absorption is reduced by about 20%, the tinting strength is improved, and the consumption is reduced under the same condition for pigmentation.

Description

technical field [0001] The invention relates to a preparation method of an inorganic pigment, in particular to a production method of iron oxide yellow pigment. Background technique [0002] The main chemical composition of iron oxide yellow pigment is ferric oxide, the content is about 86%, and most of the rest is crystal water. Molecular formula: Fe 2 o 3 ·H 2 O or FeOOH (iron oxyhydroxide). Iron oxide has yellow light ranging from lemon yellow to orange. Relative density 2.44~3.60g / cm 3 , melting point 350-400°C. Iron oxide yellow is insoluble in water, alcohol, and soluble in acid. Alkali-resistant, not acid-resistant, not high-temperature resistant, when heated above 150°C, it will be dehydrated and transformed into iron oxide red, and the transformation is relatively rapid at 270-300°C. Iron oxide yellow has strong light resistance, weather resistance and resistance to dirty gases, and its tinting strength is almost equal to that of lead chrome yellow. It is no...

Claims

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Application Information

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IPC IPC(8): C09C1/24C09C3/00
Inventor 竺增林冯阿荣李金花叶学锋王华英
Owner SHENGHUA GROUP DEQING HUAYUAN PIGMENT
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