Preparation method of coated iron oxide black with medium temperature resistance

Abstract

The invention relates to a preparation method of temperature resistant iron oxide black, and discloses coated iron oxide black with medium temperature resistance. According to the preparation method, a plurality of layers of compact films are coated on the surfaces of iron oxide molecules, so that the heat resistance of iron oxide black is improved. The method mainly comprises the steps of firstly stirring iron oxide black filter cake into pulpous state, then adding aluminum ions and silicon ions, ensuring that ion precipitate is gradually coated on the surface of the iron oxide black molecules by adjusting pH value, so as to form a plurality of protecting films to ensure that the heated temperature of coated iron oxide black reaches 200 DEG C. According to the method, coating treatment process is performed on the surface of iron oxide pigment to passivate the surface, the treatment method is advanced, and coated pigment ions are uniform, and have high strength and superior dispersion property. Accessory ingredients such as aluminum sulfate and sodium silicate for coating are easily accessible, and have low costs. The oxide black filter cake is provided by oxide black plants, the coating treatment is performed in middle stage test workshop, the treatment process is short, the energy consumption is low, the technology of the project is mature, samples are approved by customers, and performance indexes of products meet the demands of the customers.

Description

technical field [0001] The invention relates to a preparation method of temperature-resistant iron oxide black. Background technique [0002] Iron oxide black is referred to as iron black molecular formula, Fe 2 o 3 .FeO, the chemical name is ferric oxide, belongs to the spinel type, it has saturated blue ink light black, and the relative density is 4.73. It has high hiding power and tinting power, and is very stable to light and atmosphere. Because the temperature resistance of ordinary iron oxide black is poor, the heating temperature is about 100 degrees, and it will change color and fade when used in some places with high temperature. [0003] Common iron oxide black production methods such as Chinese invention patent application (application number: 200510075112.4 application date: 2005-06-08) disclose a production method of iron oxide black, including the following content: (1) Preparation of ferrous salt (2), use caustic soda as neutralizer to react with ferrous s...

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Problems solved by technology

[0004] In order to solve the technical defect of the existing iron oxide black with poor high temperature resistance, the applicant applied for a high temperature resistant iron oxide black pigment and its preparation method (200810063587.5 application Date: 2008-06-20), the high-temperature resistant iron oxide black pigment of this patent includes ferromanganese black. The molar ratio of iron element and manganese element in it is 1.5:1~5:1, and the heat resistance effect of the produced high temperature resistant iron oxide black pigment can reach 700°C or above

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