Synthesis process of iron oxide red with high tinting strength

Abstract

The invention discloses a synthesis process of iron oxide red with high tinting strength, which is characterized by comprising the following steps: adding crystal accelerator into 31.6% molten ferrous, dropwise adding a certain concentration of liquid caustic soda at 45 DEG C, and oxidizing to form seed crystal after the oxidizing finishes; supplementing a certain mass of molten ferrous, and dropwise adding 10% diluted ammonia for oxidation reaction to obtain iron oxide yellow; and calcinating the obtained iron oxide yellow and obtaining the iron oxide red. The invention has the advantages that: 2.7% crystal accelerator is mainly added into the 31.69% ferrous sulfate to synthesize the special iron oxide yellow with low oil absorption volume by adopting the liquid phase process, the special iron oxide yellow is calcinated at a certain temperature to obtain the iron oxide red, and the iron oxide red has high tinting strength and bright color and can reach the oil absorption volume standard.

Description

technical field [0001] In the present invention, a certain amount of crystal form accelerator is added to ferrous sulfate water, and a certain concentration of ferrous sulfate solution is used to obtain special iron oxide yellow, and then the special iron oxide yellow is calcined at a certain temperature to obtain high-quality Iron oxide red, and can reach the use standard of its oil absorption. Background technique [0002] Iron oxide red is the most stable compound among iron oxides, and its chemical name is ferric oxide (Fe 2 o 3 ), color from orange to purple, good optical resistance, high temperature resistance, dirty gas resistance, alkali resistance, good tinting power, strong hiding power, second only to carbon black. The heat resistance of iron red is as high as 1200°C, and it strongly absorbs ultraviolet rays, so it can strongly protect the paint base and covered objects from ultraviolet rays. The coating film made with it is fine and dense, which can play a rol...

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Problems solved by technology

However, the tinting strength of iron oxide red prepared by this method is generally low, and it is usually used in architectural coatings

In addition, dry-process iron red is generally calcined by iron oxide black and iron oxide yellow. The red phase of iron oxide calcined by iron oxide black is darker, not bright, and is purple red; while iron oxide yellow is calcined. The iron oxide red is bright in color and has high coloring strength, but because its parent is needle-shaped iron oxide yellow, the oil absorption of this iron oxide red is relatively high, which cannot meet the use standard of iron oxide red

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