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Method for preparing black iron oxide wrapped with silicon dioxide

A technology of iron oxide black and silicon dioxide, applied in chemical instruments and methods, dyeing polymer organic compound treatment, inorganic pigment treatment, etc., can solve the problems of poor dispersion stability, poor anti-flocculation, poor water resistance, etc., and achieve tinting strength High, improved water resistance, high weather resistance effect

Inactive Publication Date: 2013-10-02
ANHUI TOPTECHSCR ENVIRONMENTAL SCI & TECH
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Problems solved by technology

However, the iron oxide black used in automotive coatings, coil coatings, industrial coatings and various color pastes in the market currently has disadvantages such as poor dispersion stability, poor anti-flocculation, and poor water resistance, which cannot meet the actual requirements.

Method used

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Embodiment Construction

[0014] A preparation method of silicon dioxide coated iron oxide black, comprising the following steps:

[0015] (1) Add ferrous sulfate and deionized water into the reaction kettle according to the mass ratio of 1:2, heat to 75°C, and stir evenly to completely dissolve the ferrous sulfate;

[0016] (2) Add a sodium hydroxide solution with a mass concentration of 15% to the ferrous sulfate solution for neutralization; the pH value is controlled at 8 to obtain a ferrous hydroxide gel;

[0017] (3) When the ferrous hydroxide gel prepared above is passed through steam and heated to 90°C, the ventilation volume is 0.6m 3 Air was blown in per minute for oxidation reaction. During the reaction, the temperature was 95°C and the pH value was 8. After the reaction, the precipitated black particles were collected, washed, dried, and pulverized by conventional methods to obtain iron oxide black;

[0018] (4) Weigh 10% tetraethyl orthosilicate of iron oxide black, dissol...

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Abstract

The invention discloses a method for preparing black iron oxide wrapped with silicone dioxide. The method comprises the following steps of firstly adding water and dissolving ferrous sulfate, then adding sodium hydroxide solution to neutralize all ferrous ions, obtaining ferrous hydroxide gel, after oxidizing reaction by aerating air, washing, drying, and smashing so as to obtain the black iron oxide; then taking ethyl orthosilicate as the raw material, forming a layer of continuous compact silicone dioxide film on the surface of the black iron oxide through a sol-gel method, and obtaining the black iron oxide wrapped with the silicone dioxide. The black iron oxide prepared by the method has the characteristics of good acid-base resistance property, weather resistance, compatibility, dispersibility, flocculation resistance, strong tinting strength, and the like, thus being widely used in various paintings and having prosperous market prospect.

Description

technical field [0001] The invention relates to a preparation method of iron oxide black, in particular to a preparation method of silicon dioxide-coated iron oxide black. Background technique [0002] Iron oxide black pigment is a powdery black pigment with saturated blue ink light black, the main component is ferric oxide, the molecular formula is Fe 3 o 4 or FeO·Fe 2 o 3 . Iron oxide black pigment is widely used because of its non-toxic, cheap, wear-resistant, weather-resistant and other characteristics. It is mainly used in industries such as building materials, coatings, plastics, rubber, ceramics, inks, and art pigments. However, iron oxide black used in automotive coatings, coil coatings, industrial coatings and various color pastes currently on the market has disadvantages such as poor dispersion stability, poor anti-flocculation, and poor water resistance, which cannot meet the actual requirements. Contents of the invention [0003] The purpose of the present...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/24C09C3/10C09C3/06
Inventor 卢叶恒
Owner ANHUI TOPTECHSCR ENVIRONMENTAL SCI & TECH
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